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gstreamer/ext/dash/gstdashdemux.c
Stéphane Cerveau ac74b042ec dash: Generate an XML content from object. 
Add mpd node base class to provide
xml generation facilities for child
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2020-01-03 20:50:27 +00:00

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/*
* DASH demux plugin for GStreamer
*
* gstdashdemux.c
*
* Copyright (C) 2012 Orange
*
* Authors:
* David Corvoysier <david.corvoysier@orange.com>
* Hamid Zakari <hamid.zakari@gmail.com>
*
* Copyright (C) 2013 Smart TV Alliance
* Author: Thiago Sousa Santos <thiago.sousa.santos@collabora.com>, Collabora Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library (COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-dashdemux
* @title: dashdemux
*
* DASH demuxer element.
* ## Example launch line
* |[
* gst-launch-1.0 playbin uri="http://www-itec.uni-klu.ac.at/ftp/datasets/mmsys12/RedBullPlayStreets/redbull_4s/RedBullPlayStreets_4s_isoffmain_DIS_23009_1_v_2_1c2_2011_08_30.mpd"
* ]|
*/
/* Implementation notes:
*
* The following section describes how dashdemux works internally.
*
* Introduction:
*
* dashdemux is a "fake" demux, as unlike traditional demux elements, it
* doesn't split data streams contained in an envelope to expose them to
* downstream decoding elements.
*
* Instead, it parses an XML file called a manifest to identify a set of
* individual stream fragments it needs to fetch and expose to the actual
* demux elements that will handle them (this behavior is sometimes
* referred as the "demux after a demux" scenario).
*
* For a given section of content, several representations corresponding
* to different bitrates may be available: dashdemux will select the most
* appropriate representation based on local conditions (typically the
* available bandwidth and the amount of buffering available, capped by
* a maximum allowed bitrate).
*
* The representation selection algorithm can be configured using
* specific properties: max bitrate, min/max buffering, bandwidth ratio.
*
*
* General Design:
*
* dashdemux has a single sink pad that accepts the data corresponding
* to the manifest, typically fetched from an HTTP or file source.
*
* dashdemux exposes the streams it recreates based on the fragments it
* fetches through dedicated src pads corresponding to the caps of the
* fragments container (ISOBMFF/MP4 or MPEG2TS).
*
* During playback, new representations will typically be exposed as a
* new set of pads (see 'Switching between representations' below).
*
* Fragments downloading is performed using a dedicated task that fills
* an internal queue. Another task is in charge of popping fragments
* from the queue and pushing them downstream.
*
* Switching between representations:
*
* Decodebin supports scenarios allowing to seamlessly switch from one
* stream to another inside the same "decoding chain".
*
* To achieve that, it combines the elements it autoplugged in chains
* and groups, allowing only one decoding group to be active at a given
* time for a given chain.
*
* A chain can signal decodebin that it is complete by sending a
* no-more-pads event, but even after that new pads can be added to
* create new subgroups, providing that a new no-more-pads event is sent.
*
* We take advantage of that to dynamically create a new decoding group
* in order to select a different representation during playback.
*
* Typically, assuming that each fragment contains both audio and video,
* the following tree would be created:
*
* chain "DASH Demux"
* |_ group "Representation set 1"
* | |_ chain "Qt Demux 0"
* | |_ group "Stream 0"
* | |_ chain "H264"
* | |_ chain "AAC"
* |_ group "Representation set 2"
* |_ chain "Qt Demux 1"
* |_ group "Stream 1"
* |_ chain "H264"
* |_ chain "AAC"
*
* Or, if audio and video are contained in separate fragments:
*
* chain "DASH Demux"
* |_ group "Representation set 1"
* | |_ chain "Qt Demux 0"
* | | |_ group "Stream 0"
* | | |_ chain "H264"
* | |_ chain "Qt Demux 1"
* | |_ group "Stream 1"
* | |_ chain "AAC"
* |_ group "Representation set 2"
* |_ chain "Qt Demux 3"
* | |_ group "Stream 2"
* | |_ chain "H264"
* |_ chain "Qt Demux 4"
* |_ group "Stream 3"
* |_ chain "AAC"
*
* In both cases, when switching from Set 1 to Set 2 an EOS is sent on
* each end pad corresponding to Rep 0, triggering the "drain" state to
* propagate upstream.
* Once both EOS have been processed, the "Set 1" group is completely
* drained, and decodebin2 will switch to the "Set 2" group.
*
* Note: nothing can be pushed to the new decoding group before the
* old one has been drained, which means that in order to be able to
* adapt quickly to bandwidth changes, we will not be able to rely
* on downstream buffering, and will instead manage an internal queue.
*
*
* Keyframe trick-mode implementation:
*
* When requested (with GST_SEEK_FLAG_TRICKMODE_KEY_UNIT) and if the format
* is supported (ISOBMFF profiles), dashdemux can download only keyframes
* in order to provide fast forward/reverse playback without exceeding the
* available bandwidth/cpu/memory usage.
*
* This is done in two parts:
* 1) Parsing ISOBMFF atoms to detect the location of keyframes and only
* download/push those.
* 2) Deciding what the ideal next keyframe to download is in order to
* provide as many keyframes as possible without rebuffering.
*
* * Keyframe-only downloads:
*
* For each beginning of fragment, the fragment header will be parsed in
* gst_dash_demux_parse_isobmff() and then the information (offset, pts...)
* of each keyframe will be stored in moof_sync_samples.
*
* gst_dash_demux_stream_update_fragment_info() will specify the range
* start and end of the current keyframe, which will cause GstAdaptiveDemux
* to do a new upstream range request.
*
* When advancing, if there are still some keyframes in the current
* fragment, gst_dash_demux_stream_advance_fragment() will call
* gst_dash_demux_stream_advance_sync_sample() which decides what the next
* keyframe to get will be (it can be in reverse order for example, or
* might not be the *next* keyframe but one further as explained below).
*
* If no more keyframes are available in the current fragment, dash will
* advance to the next fragment (just like in the normal case) or to a
* fragment much further away (as explained below).
*
*
* * Deciding the optimal "next" keyframe/fragment to download:
*
* The main reason for doing keyframe-only downloads is for trick-modes
* (i.e. being able to do fast reverse/forward playback with limited
* bandwidth/cpu/memory).
*
* Downloading all keyframes might not be the optimal solution, especially
* at high playback rates, since the time taken to download the keyframe
* might exceed the available running time between two displayed frames
* (i.e. all frames would end up arriving late). This would cause severe
* rebuffering.
*
* Note: The values specified below can be in either the segment running
* time or in absolute values. Where position values need to be converted
* to segment running time the "running_time(val)" notation is used, and
* where running time need ot be converted to segment poisition the
* "position(val)" notation is used.
*
* The goal instead is to be able to download/display as many frames as
* possible for a given playback rate. For that the implementation will
* take into account:
* * The requested playback rate and segment
* * The average time to request and download a keyframe (in running time)
* * The current position of dashdemux in the stream
* * The current downstream (i.e. sink) position (in running time)
*
* To reach this goal we consider that there is some amount of buffering
* (in time) between dashdemux and the display sink. While we do not know
* the exact amount of buffering available, a safe and reasonable assertion
* is that there is at least a second (in running time).
*
* The average time to request and fully download a keyframe (with or
* without fragment header) is obtained by averaging the
* GstAdaptiveDemuxStream->last_download_time and is stored in
* GstDashDemuxStream->average_download_time. Those values include the
* network latency and full download time, which are more interesting and
* correct than just bitrates (with small download sizes, the impact of the
* network latency is much higher).
*
* The current position is calculated based on the fragment timestamp and
* the current keyframe index within that fragment. It is stored in
* GstDashDemuxStream->actual_position.
*
* The downstream position of the pipeline is obtained via QoS events and
* is stored in GstAdaptiveDemuxStream->qos_earliest_time (note: it's a
* running time value).
*
* The estimated buffering level between dashdemux and downstream is
* therefore:
* buffering_level = running_time(actual_position) - qos_earliest_time
*
* In order to avoid rebuffering, we want to ensure that the next keyframe
* (including potential fragment header) we request will be download, demuxed
* and decoded in time so that it is not late. That next keyframe time is
* called the "target_time" and is calculated whenever we have finished
* pushing a keyframe downstream.
*
* One simple observation at this point is that we *need* to make sure that
* the target time is chosen such that:
* running_time(target_time) > qos_earliest_time + average_download_time
*
* i.e. we chose a target time which will be greater than the time at which
* downstream will be once we request and download the keyframe (otherwise
* we're guaranteed to be late).
*
* This would provide the highest number of displayed frames per
* second, but it is just a *minimal* value and is not enough as-is,
* since it doesn't take into account the following items which could
* cause frames to arrive late (and therefore rebuffering):
* * Network jitter (i.e. by how much the download time can fluctuate)
* * Network stalling
* * Different keyframe sizes (and therefore download time)
* * Decoding speed
*
* Instead, we adjust the target time calculation based on the
* buffering_level.
*
* The smaller the buffering level is (i.e. the closer we are between
* current and downstream), the more aggressively we skip forward (and
* guarantee the keyframe will be downloaded, decoded and displayed in
* time). And the higher the buffering level, the least aggresivelly
* we need to skip forward (and therefore display more frames per
* second).
*
* Right now the threshold for aggressive switching is set to 3
* average_download_time. Below that buffering level we set the target time
* to at least 3 average_download_time distance beyond the
* qos_earliest_time.
*
* If we are above that buffering level we set the target time to:
* position(running_time(position) + average_download_time)
*
* The logic is therefore:
* WHILE(!EOS)
* Calculate target_time
* Advance to keyframe/fragment for that target_time
* Adaptivedemux downloads that keyframe/fragment
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <gio/gio.h>
#include <gst/base/gsttypefindhelper.h>
#include <gst/tag/tag.h>
#include <gst/net/gstnet.h>
#include "gst/gst-i18n-plugin.h"
#include "gstdashdemux.h"
#include "gstdash_debug.h"
static GstStaticPadTemplate gst_dash_demux_videosrc_template =
GST_STATIC_PAD_TEMPLATE ("video_%02u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_dash_demux_audiosrc_template =
GST_STATIC_PAD_TEMPLATE ("audio_%02u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_dash_demux_subtitlesrc_template =
GST_STATIC_PAD_TEMPLATE ("subtitle_%02u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/dash+xml"));
GST_DEBUG_CATEGORY (gst_dash_demux_debug);
#define GST_CAT_DEFAULT gst_dash_demux_debug
enum
{
PROP_0,
PROP_MAX_BUFFERING_TIME,
PROP_BANDWIDTH_USAGE,
PROP_MAX_BITRATE,
PROP_MAX_VIDEO_WIDTH,
PROP_MAX_VIDEO_HEIGHT,
PROP_MAX_VIDEO_FRAMERATE,
PROP_PRESENTATION_DELAY,
PROP_LAST
};
/* Default values for properties */
#define DEFAULT_MAX_BUFFERING_TIME 30 /* in seconds */
#define DEFAULT_BANDWIDTH_USAGE 0.8f /* 0 to 1 */
#define DEFAULT_MAX_BITRATE 0 /* in bit/s */
#define DEFAULT_MAX_VIDEO_WIDTH 0
#define DEFAULT_MAX_VIDEO_HEIGHT 0
#define DEFAULT_MAX_VIDEO_FRAMERATE_N 0
#define DEFAULT_MAX_VIDEO_FRAMERATE_D 1
#define DEFAULT_PRESENTATION_DELAY "10s" /* 10s */
/* Clock drift compensation for live streams */
#define SLOW_CLOCK_UPDATE_INTERVAL (1000000 * 30 * 60) /* 30 minutes */
#define FAST_CLOCK_UPDATE_INTERVAL (1000000 * 30) /* 30 seconds */
#define SUPPORTED_CLOCK_FORMATS (GST_MPD_UTCTIMING_TYPE_NTP | GST_MPD_UTCTIMING_TYPE_HTTP_HEAD | GST_MPD_UTCTIMING_TYPE_HTTP_XSDATE | GST_MPD_UTCTIMING_TYPE_HTTP_ISO | GST_MPD_UTCTIMING_TYPE_HTTP_NTP)
#define NTP_TO_UNIX_EPOCH G_GUINT64_CONSTANT(2208988800) /* difference (in seconds) between NTP epoch and Unix epoch */
struct _GstDashDemuxClockDrift
{
GMutex clock_lock; /* used to protect access to struct */
guint selected_url;
gint64 next_update;
/* @clock_compensation: amount (in usecs) to add to client's idea of
now to map it to the server's idea of now */
GTimeSpan clock_compensation;
GstClock *ntp_clock;
};
typedef struct
{
guint64 start_offset, end_offset;
/* TODO: Timestamp and duration */
} GstDashStreamSyncSample;
/* GObject */
static void gst_dash_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_dash_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_dash_demux_dispose (GObject * obj);
/* GstAdaptiveDemux */
static GstClockTime gst_dash_demux_get_duration (GstAdaptiveDemux * ademux);
static gboolean gst_dash_demux_is_live (GstAdaptiveDemux * ademux);
static void gst_dash_demux_reset (GstAdaptiveDemux * ademux);
static gboolean gst_dash_demux_process_manifest (GstAdaptiveDemux * ademux,
GstBuffer * buf);
static gboolean gst_dash_demux_seek (GstAdaptiveDemux * demux, GstEvent * seek);
static GstFlowReturn
gst_dash_demux_stream_update_fragment_info (GstAdaptiveDemuxStream * stream);
static GstFlowReturn gst_dash_demux_stream_seek (GstAdaptiveDemuxStream *
stream, gboolean forward, GstSeekFlags flags, GstClockTime ts,
GstClockTime * final_ts);
static gboolean gst_dash_demux_stream_has_next_fragment (GstAdaptiveDemuxStream
* stream);
static GstFlowReturn
gst_dash_demux_stream_advance_fragment (GstAdaptiveDemuxStream * stream);
static gboolean
gst_dash_demux_stream_advance_subfragment (GstAdaptiveDemuxStream * stream);
static gboolean gst_dash_demux_stream_select_bitrate (GstAdaptiveDemuxStream *
stream, guint64 bitrate);
static gint64 gst_dash_demux_get_manifest_update_interval (GstAdaptiveDemux *
demux);
static GstFlowReturn gst_dash_demux_update_manifest_data (GstAdaptiveDemux *
demux, GstBuffer * buf);
static gint64
gst_dash_demux_stream_get_fragment_waiting_time (GstAdaptiveDemuxStream *
stream);
static void gst_dash_demux_advance_period (GstAdaptiveDemux * demux);
static gboolean gst_dash_demux_has_next_period (GstAdaptiveDemux * demux);
static GstFlowReturn gst_dash_demux_data_received (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream, GstBuffer * buffer);
static gboolean
gst_dash_demux_stream_fragment_start (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream);
static GstFlowReturn
gst_dash_demux_stream_fragment_finished (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream);
static gboolean gst_dash_demux_need_another_chunk (GstAdaptiveDemuxStream *
stream);
/* GstDashDemux */
static gboolean gst_dash_demux_setup_all_streams (GstDashDemux * demux);
static void gst_dash_demux_stream_free (GstAdaptiveDemuxStream * stream);
static GstCaps *gst_dash_demux_get_input_caps (GstDashDemux * demux,
GstActiveStream * stream);
static GstPad *gst_dash_demux_create_pad (GstDashDemux * demux,
GstActiveStream * stream);
static GstDashDemuxClockDrift *gst_dash_demux_clock_drift_new (GstDashDemux *
demux);
static void gst_dash_demux_clock_drift_free (GstDashDemuxClockDrift *);
static gboolean gst_dash_demux_poll_clock_drift (GstDashDemux * demux);
static GTimeSpan gst_dash_demux_get_clock_compensation (GstDashDemux * demux);
static GDateTime *gst_dash_demux_get_server_now_utc (GstDashDemux * demux);
#define SIDX(s) (&(s)->sidx_parser.sidx)
static inline GstSidxBoxEntry *
SIDX_ENTRY (GstDashDemuxStream * s, gint i)
{
g_assert (i < SIDX (s)->entries_count);
return &(SIDX (s)->entries[(i)]);
}
#define SIDX_CURRENT_ENTRY(s) SIDX_ENTRY(s, SIDX(s)->entry_index)
static void gst_dash_demux_send_content_protection_event (gpointer cp_data,
gpointer stream);
#define gst_dash_demux_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstDashDemux, gst_dash_demux, GST_TYPE_ADAPTIVE_DEMUX,
GST_DEBUG_CATEGORY_INIT (gst_dash_demux_debug, "dashdemux", 0,
"dashdemux element")
);
static void
gst_dash_demux_dispose (GObject * obj)
{
GstDashDemux *demux = GST_DASH_DEMUX (obj);
gst_dash_demux_reset (GST_ADAPTIVE_DEMUX_CAST (demux));
if (demux->client) {
gst_mpd_client_free (demux->client);
demux->client = NULL;
}
g_mutex_clear (&demux->client_lock);
gst_dash_demux_clock_drift_free (demux->clock_drift);
demux->clock_drift = NULL;
g_free (demux->default_presentation_delay);
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
static gboolean
gst_dash_demux_get_live_seek_range (GstAdaptiveDemux * demux, gint64 * start,
gint64 * stop)
{
GstDashDemux *self = GST_DASH_DEMUX (demux);
GDateTime *now;
GDateTime *mstart;
GTimeSpan stream_now;
GstClockTime seg_duration;
if (self->client->mpd_root_node->availabilityStartTime == NULL)
return FALSE;
seg_duration = gst_mpd_client_get_maximum_segment_duration (self->client);
now = gst_dash_demux_get_server_now_utc (self);
mstart =
gst_date_time_to_g_date_time (self->client->mpd_root_node->
availabilityStartTime);
stream_now = g_date_time_difference (now, mstart);
g_date_time_unref (now);
g_date_time_unref (mstart);
if (stream_now <= 0)
return FALSE;
*stop = stream_now * GST_USECOND;
if (self->client->mpd_root_node->timeShiftBufferDepth ==
GST_MPD_DURATION_NONE) {
*start = 0;
} else {
*start =
*stop -
(self->client->mpd_root_node->timeShiftBufferDepth * GST_MSECOND);
if (*start < 0)
*start = 0;
}
/* As defined in 5.3.9.5.3 of the DASH specification, a segment does
not become available until the sum of:
* the value of the MPD@availabilityStartTime,
* the PeriodStart time of the containing Period
* the MPD start time of the Media Segment, and
* the MPD duration of the Media Segment.
Therefore we need to subtract the media segment duration from the stop
time.
*/
*stop -= seg_duration;
return TRUE;
}
static GstClockTime
gst_dash_demux_get_presentation_offset (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
return gst_mpd_client_get_stream_presentation_offset (dashdemux->client,
dashstream->index);
}
static GstClockTime
gst_dash_demux_get_period_start_time (GstAdaptiveDemux * demux)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
return gst_mpd_client_get_period_start_time (dashdemux->client);
}
static void
gst_dash_demux_class_init (GstDashDemuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstAdaptiveDemuxClass *gstadaptivedemux_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstadaptivedemux_class = (GstAdaptiveDemuxClass *) klass;
gobject_class->set_property = gst_dash_demux_set_property;
gobject_class->get_property = gst_dash_demux_get_property;
gobject_class->dispose = gst_dash_demux_dispose;
#ifndef GST_REMOVE_DEPRECATED
g_object_class_install_property (gobject_class, PROP_MAX_BUFFERING_TIME,
g_param_spec_uint ("max-buffering-time", "Maximum buffering time",
"Maximum number of seconds of buffer accumulated during playback"
"(deprecated)",
2, G_MAXUINT, DEFAULT_MAX_BUFFERING_TIME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_DEPRECATED));
g_object_class_install_property (gobject_class, PROP_BANDWIDTH_USAGE,
g_param_spec_float ("bandwidth-usage",
"Bandwidth usage [0..1]",
"Percentage of the available bandwidth to use when "
"selecting representations (deprecated)",
0, 1, DEFAULT_BANDWIDTH_USAGE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_DEPRECATED));
#endif
g_object_class_install_property (gobject_class, PROP_MAX_BITRATE,
g_param_spec_uint ("max-bitrate", "Max bitrate",
"Max of bitrate supported by target video decoder (0 = no maximum)",
0, G_MAXUINT, DEFAULT_MAX_BITRATE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_VIDEO_WIDTH,
g_param_spec_uint ("max-video-width", "Max video width",
"Max video width to select (0 = no maximum)",
0, G_MAXUINT, DEFAULT_MAX_VIDEO_WIDTH,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_VIDEO_HEIGHT,
g_param_spec_uint ("max-video-height", "Max video height",
"Max video height to select (0 = no maximum)",
0, G_MAXUINT, DEFAULT_MAX_VIDEO_HEIGHT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_VIDEO_FRAMERATE,
gst_param_spec_fraction ("max-video-framerate", "Max video framerate",
"Max video framerate to select (0/1 = no maximum)",
0, 1, G_MAXINT, 1, DEFAULT_MAX_VIDEO_FRAMERATE_N,
DEFAULT_MAX_VIDEO_FRAMERATE_D,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PRESENTATION_DELAY,
g_param_spec_string ("presentation-delay", "Presentation delay",
"Default presentation delay (in seconds, milliseconds or fragments) (e.g. 12s, 2500ms, 3f)",
DEFAULT_PRESENTATION_DELAY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (gstelement_class,
&gst_dash_demux_audiosrc_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_dash_demux_videosrc_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_dash_demux_subtitlesrc_template);
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gst_element_class_set_static_metadata (gstelement_class,
"DASH Demuxer",
"Codec/Demuxer/Adaptive",
"Dynamic Adaptive Streaming over HTTP demuxer",
"David Corvoysier <david.corvoysier@orange.com>\n\
Hamid Zakari <hamid.zakari@gmail.com>\n\
Gianluca Gennari <gennarone@gmail.com>");
gstadaptivedemux_class->get_duration = gst_dash_demux_get_duration;
gstadaptivedemux_class->is_live = gst_dash_demux_is_live;
gstadaptivedemux_class->reset = gst_dash_demux_reset;
gstadaptivedemux_class->seek = gst_dash_demux_seek;
gstadaptivedemux_class->process_manifest = gst_dash_demux_process_manifest;
gstadaptivedemux_class->update_manifest_data =
gst_dash_demux_update_manifest_data;
gstadaptivedemux_class->get_manifest_update_interval =
gst_dash_demux_get_manifest_update_interval;
gstadaptivedemux_class->has_next_period = gst_dash_demux_has_next_period;
gstadaptivedemux_class->advance_period = gst_dash_demux_advance_period;
gstadaptivedemux_class->stream_has_next_fragment =
gst_dash_demux_stream_has_next_fragment;
gstadaptivedemux_class->stream_advance_fragment =
gst_dash_demux_stream_advance_fragment;
gstadaptivedemux_class->stream_get_fragment_waiting_time =
gst_dash_demux_stream_get_fragment_waiting_time;
gstadaptivedemux_class->stream_seek = gst_dash_demux_stream_seek;
gstadaptivedemux_class->stream_select_bitrate =
gst_dash_demux_stream_select_bitrate;
gstadaptivedemux_class->stream_update_fragment_info =
gst_dash_demux_stream_update_fragment_info;
gstadaptivedemux_class->stream_free = gst_dash_demux_stream_free;
gstadaptivedemux_class->get_live_seek_range =
gst_dash_demux_get_live_seek_range;
gstadaptivedemux_class->get_presentation_offset =
gst_dash_demux_get_presentation_offset;
gstadaptivedemux_class->get_period_start_time =
gst_dash_demux_get_period_start_time;
gstadaptivedemux_class->start_fragment = gst_dash_demux_stream_fragment_start;
gstadaptivedemux_class->finish_fragment =
gst_dash_demux_stream_fragment_finished;
gstadaptivedemux_class->data_received = gst_dash_demux_data_received;
gstadaptivedemux_class->need_another_chunk =
gst_dash_demux_need_another_chunk;
}
static void
gst_dash_demux_init (GstDashDemux * demux)
{
/* Properties */
demux->max_buffering_time = DEFAULT_MAX_BUFFERING_TIME * GST_SECOND;
demux->max_bitrate = DEFAULT_MAX_BITRATE;
demux->max_video_width = DEFAULT_MAX_VIDEO_WIDTH;
demux->max_video_height = DEFAULT_MAX_VIDEO_HEIGHT;
demux->max_video_framerate_n = DEFAULT_MAX_VIDEO_FRAMERATE_N;
demux->max_video_framerate_d = DEFAULT_MAX_VIDEO_FRAMERATE_D;
demux->default_presentation_delay = g_strdup (DEFAULT_PRESENTATION_DELAY);
g_mutex_init (&demux->client_lock);
gst_adaptive_demux_set_stream_struct_size (GST_ADAPTIVE_DEMUX_CAST (demux),
sizeof (GstDashDemuxStream));
}
static void
gst_dash_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAdaptiveDemux *adaptivedemux = GST_ADAPTIVE_DEMUX_CAST (object);
GstDashDemux *demux = GST_DASH_DEMUX (object);
switch (prop_id) {
case PROP_MAX_BUFFERING_TIME:
demux->max_buffering_time = g_value_get_uint (value) * GST_SECOND;
break;
case PROP_BANDWIDTH_USAGE:
adaptivedemux->bitrate_limit = g_value_get_float (value);
break;
case PROP_MAX_BITRATE:
demux->max_bitrate = g_value_get_uint (value);
break;
case PROP_MAX_VIDEO_WIDTH:
demux->max_video_width = g_value_get_uint (value);
break;
case PROP_MAX_VIDEO_HEIGHT:
demux->max_video_height = g_value_get_uint (value);
break;
case PROP_MAX_VIDEO_FRAMERATE:
demux->max_video_framerate_n = gst_value_get_fraction_numerator (value);
demux->max_video_framerate_d = gst_value_get_fraction_denominator (value);
break;
case PROP_PRESENTATION_DELAY:
g_free (demux->default_presentation_delay);
demux->default_presentation_delay = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_dash_demux_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstAdaptiveDemux *adaptivedemux = GST_ADAPTIVE_DEMUX_CAST (object);
GstDashDemux *demux = GST_DASH_DEMUX (object);
switch (prop_id) {
case PROP_MAX_BUFFERING_TIME:
g_value_set_uint (value, demux->max_buffering_time / GST_SECOND);
break;
case PROP_BANDWIDTH_USAGE:
g_value_set_float (value, adaptivedemux->bitrate_limit);
break;
case PROP_MAX_BITRATE:
g_value_set_uint (value, demux->max_bitrate);
break;
case PROP_MAX_VIDEO_WIDTH:
g_value_set_uint (value, demux->max_video_width);
break;
case PROP_MAX_VIDEO_HEIGHT:
g_value_set_uint (value, demux->max_video_height);
break;
case PROP_MAX_VIDEO_FRAMERATE:
gst_value_set_fraction (value, demux->max_video_framerate_n,
demux->max_video_framerate_d);
break;
case PROP_PRESENTATION_DELAY:
if (demux->default_presentation_delay == NULL)
g_value_set_static_string (value, "");
else
g_value_set_string (value, demux->default_presentation_delay);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_dash_demux_setup_mpdparser_streams (GstDashDemux * demux,
GstMPDClient * client)
{
gboolean has_streams = FALSE;
GList *adapt_sets, *iter;
adapt_sets = gst_mpd_client_get_adaptation_sets (client);
for (iter = adapt_sets; iter; iter = g_list_next (iter)) {
GstMPDAdaptationSetNode *adapt_set_node = iter->data;
gst_mpd_client_setup_streaming (client, adapt_set_node);
has_streams = TRUE;
}
if (!has_streams) {
GST_ELEMENT_ERROR (demux, STREAM, DEMUX, ("Manifest has no playable "
"streams"), ("No streams could be activated from the manifest"));
}
return has_streams;
}
static gboolean
gst_dash_demux_setup_all_streams (GstDashDemux * demux)
{
guint i;
GST_DEBUG_OBJECT (demux, "Setting up streams for period %d",
gst_mpd_client_get_period_index (demux->client));
/* clean old active stream list, if any */
gst_mpd_client_active_streams_free (demux->client);
if (!gst_dash_demux_setup_mpdparser_streams (demux, demux->client)) {
return FALSE;
}
GST_DEBUG_OBJECT (demux, "Creating stream objects");
for (i = 0; i < gst_mpd_client_get_nb_active_stream (demux->client); i++) {
GstDashDemuxStream *stream;
GstActiveStream *active_stream;
GstCaps *caps;
GstStructure *s;
GstPad *srcpad;
gchar *lang = NULL;
GstTagList *tags = NULL;
active_stream =
gst_mpd_client_get_active_stream_by_index (demux->client, i);
if (active_stream == NULL)
continue;
if (demux->trickmode_no_audio
&& active_stream->mimeType == GST_STREAM_AUDIO) {
GST_DEBUG_OBJECT (demux,
"Skipping audio stream %d because of TRICKMODE_NO_AUDIO flag", i);
continue;
}
srcpad = gst_dash_demux_create_pad (demux, active_stream);
if (srcpad == NULL)
continue;
caps = gst_dash_demux_get_input_caps (demux, active_stream);
GST_LOG_OBJECT (demux, "Creating stream %d %" GST_PTR_FORMAT, i, caps);
if (active_stream->cur_adapt_set) {
GstMPDAdaptationSetNode *adp_set = active_stream->cur_adapt_set;
lang = adp_set->lang;
/* Fallback to the language in ContentComponent node */
if (lang == NULL) {
GList *it;
for (it = adp_set->ContentComponents; it; it = it->next) {
GstMPDContentComponentNode *cc_node = it->data;
if (cc_node->lang) {
lang = cc_node->lang;
break;
}
}
}
}
if (lang) {
if (gst_tag_check_language_code (lang))
tags = gst_tag_list_new (GST_TAG_LANGUAGE_CODE, lang, NULL);
else
tags = gst_tag_list_new (GST_TAG_LANGUAGE_NAME, lang, NULL);
}
stream = (GstDashDemuxStream *)
gst_adaptive_demux_stream_new (GST_ADAPTIVE_DEMUX_CAST (demux), srcpad);
stream->active_stream = active_stream;
s = gst_caps_get_structure (caps, 0);
stream->allow_sidx =
gst_mpd_client_has_isoff_ondemand_profile (demux->client);
stream->is_isobmff = gst_structure_has_name (s, "video/quicktime")
|| gst_structure_has_name (s, "audio/x-m4a");
stream->first_sync_sample_always_after_moof = TRUE;
stream->adapter = gst_adapter_new ();
gst_adaptive_demux_stream_set_caps (GST_ADAPTIVE_DEMUX_STREAM_CAST (stream),
caps);
if (tags)
gst_adaptive_demux_stream_set_tags (GST_ADAPTIVE_DEMUX_STREAM_CAST
(stream), tags);
stream->index = i;
stream->pending_seek_ts = GST_CLOCK_TIME_NONE;
stream->sidx_position = GST_CLOCK_TIME_NONE;
stream->actual_position = GST_CLOCK_TIME_NONE;
stream->target_time = GST_CLOCK_TIME_NONE;
/* Set a default average keyframe download time of a quarter of a second */
stream->average_download_time = 250 * GST_MSECOND;
if (active_stream->cur_adapt_set &&
GST_MPD_REPRESENTATION_BASE_NODE (active_stream->
cur_adapt_set)->ContentProtection) {
GST_DEBUG_OBJECT (demux, "Adding ContentProtection events to source pad");
g_list_foreach (GST_MPD_REPRESENTATION_BASE_NODE
(active_stream->cur_adapt_set)->ContentProtection,
gst_dash_demux_send_content_protection_event, stream);
}
gst_isoff_sidx_parser_init (&stream->sidx_parser);
}
return TRUE;
}
static void
gst_dash_demux_send_content_protection_event (gpointer data, gpointer userdata)
{
GstMPDDescriptorTypeNode *cp = (GstMPDDescriptorTypeNode *) data;
GstDashDemuxStream *stream = (GstDashDemuxStream *) userdata;
GstEvent *event;
GstBuffer *pssi;
glong pssi_len;
gchar *schemeIdUri;
if (cp->schemeIdUri == NULL)
return;
GST_TRACE_OBJECT (stream, "check schemeIdUri %s", cp->schemeIdUri);
/* RFC 2141 states: The leading "urn:" sequence is case-insensitive */
schemeIdUri = g_ascii_strdown (cp->schemeIdUri, -1);
if (g_str_has_prefix (schemeIdUri, "urn:uuid:")) {
pssi_len = strlen (cp->value);
pssi = gst_buffer_new_wrapped (g_memdup (cp->value, pssi_len), pssi_len);
GST_LOG_OBJECT (stream, "Queuing Protection event on source pad");
/* RFC 4122 states that the hex part of a UUID is in lower case,
* but some streams seem to ignore this and use upper case for the
* protection system ID */
event = gst_event_new_protection (cp->schemeIdUri + 9, pssi, "dash/mpd");
gst_adaptive_demux_stream_queue_event ((GstAdaptiveDemuxStream *) stream,
event);
gst_buffer_unref (pssi);
}
g_free (schemeIdUri);
}
static GstClockTime
gst_dash_demux_get_duration (GstAdaptiveDemux * ademux)
{
GstDashDemux *demux = GST_DASH_DEMUX_CAST (ademux);
g_return_val_if_fail (demux->client != NULL, GST_CLOCK_TIME_NONE);
return gst_mpd_client_get_media_presentation_duration (demux->client);
}
static gboolean
gst_dash_demux_is_live (GstAdaptiveDemux * ademux)
{
GstDashDemux *demux = GST_DASH_DEMUX_CAST (ademux);
g_return_val_if_fail (demux->client != NULL, FALSE);
return gst_mpd_client_is_live (demux->client);
}
static gboolean
gst_dash_demux_setup_streams (GstAdaptiveDemux * demux)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
gboolean ret = TRUE;
GstDateTime *now = NULL;
guint period_idx;
/* setup video, audio and subtitle streams, starting from first Period if
* non-live */
period_idx = 0;
if (gst_mpd_client_is_live (dashdemux->client)) {
GDateTime *g_now;
if (dashdemux->client->mpd_root_node->availabilityStartTime == NULL) {
ret = FALSE;
GST_ERROR_OBJECT (demux, "MPD does not have availabilityStartTime");
goto done;
}
if (dashdemux->clock_drift == NULL) {
gchar **urls;
urls =
gst_mpd_client_get_utc_timing_sources (dashdemux->client,
SUPPORTED_CLOCK_FORMATS, NULL);
if (urls) {
GST_DEBUG_OBJECT (dashdemux, "Found a supported UTCTiming element");
dashdemux->clock_drift = gst_dash_demux_clock_drift_new (dashdemux);
gst_dash_demux_poll_clock_drift (dashdemux);
}
}
/* get period index for period encompassing the current time */
g_now = gst_dash_demux_get_server_now_utc (dashdemux);
now = gst_date_time_new_from_g_date_time (g_now);
if (dashdemux->client->mpd_root_node->suggestedPresentationDelay != -1) {
GstDateTime *target = gst_mpd_client_add_time_difference (now,
dashdemux->client->mpd_root_node->suggestedPresentationDelay * -1000);
gst_date_time_unref (now);
now = target;
} else if (dashdemux->default_presentation_delay) {
gint64 dfp =
gst_mpd_client_parse_default_presentation_delay (dashdemux->client,
dashdemux->default_presentation_delay);
GstDateTime *target = gst_mpd_client_add_time_difference (now,
dfp * -1000);
gst_date_time_unref (now);
now = target;
}
period_idx =
gst_mpd_client_get_period_index_at_time (dashdemux->client, now);
if (period_idx == G_MAXUINT) {
#ifndef GST_DISABLE_GST_DEBUG
gchar *date_str = gst_date_time_to_iso8601_string (now);
GST_DEBUG_OBJECT (demux, "Unable to find live period active at %s",
date_str);
g_free (date_str);
#endif
ret = FALSE;
goto done;
}
}
if (!gst_mpd_client_set_period_index (dashdemux->client, period_idx) ||
!gst_dash_demux_setup_all_streams (dashdemux)) {
ret = FALSE;
goto done;
}
/* If stream is live, try to find the segment that
* is closest to current time */
if (gst_mpd_client_is_live (dashdemux->client)) {
GDateTime *gnow;
GST_DEBUG_OBJECT (demux, "Seeking to current time of day for live stream ");
gnow = gst_date_time_to_g_date_time (now);
gst_mpd_client_seek_to_time (dashdemux->client, gnow);
g_date_time_unref (gnow);
} else {
GST_DEBUG_OBJECT (demux, "Seeking to first segment for on-demand stream ");
/* start playing from the first segment */
gst_mpd_client_seek_to_first_segment (dashdemux->client);
}
done:
if (now != NULL)
gst_date_time_unref (now);
return ret;
}
static gboolean
gst_dash_demux_process_manifest (GstAdaptiveDemux * demux, GstBuffer * buf)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
gboolean ret = FALSE;
gchar *manifest;
GstMapInfo mapinfo;
if (dashdemux->client)
gst_mpd_client_free (dashdemux->client);
dashdemux->client = gst_mpd_client_new ();
gst_mpd_client_set_uri_downloader (dashdemux->client, demux->downloader);
dashdemux->client->mpd_uri = g_strdup (demux->manifest_uri);
dashdemux->client->mpd_base_uri = g_strdup (demux->manifest_base_uri);
GST_DEBUG_OBJECT (demux, "Fetched MPD file at URI: %s (base: %s)",
dashdemux->client->mpd_uri,
GST_STR_NULL (dashdemux->client->mpd_base_uri));
if (gst_buffer_map (buf, &mapinfo, GST_MAP_READ)) {
manifest = (gchar *) mapinfo.data;
if (gst_mpd_client_parse (dashdemux->client, manifest, mapinfo.size)) {
if (gst_mpd_client_setup_media_presentation (dashdemux->client, 0, 0,
NULL)) {
ret = TRUE;
} else {
GST_ELEMENT_ERROR (demux, STREAM, DECODE,
("Incompatible manifest file."), (NULL));
}
}
gst_buffer_unmap (buf, &mapinfo);
} else {
GST_WARNING_OBJECT (demux, "Failed to map manifest buffer");
}
if (ret)
ret = gst_dash_demux_setup_streams (demux);
return ret;
}
static GstPad *
gst_dash_demux_create_pad (GstDashDemux * demux, GstActiveStream * stream)
{
GstPad *pad;
GstPadTemplate *tmpl;
gchar *name;
switch (stream->mimeType) {
case GST_STREAM_AUDIO:
name = g_strdup_printf ("audio_%02u", demux->n_audio_streams++);
tmpl = gst_static_pad_template_get (&gst_dash_demux_audiosrc_template);
break;
case GST_STREAM_VIDEO:
name = g_strdup_printf ("video_%02u", demux->n_video_streams++);
tmpl = gst_static_pad_template_get (&gst_dash_demux_videosrc_template);
break;
case GST_STREAM_APPLICATION:
if (gst_mpd_client_active_stream_contains_subtitles (stream)) {
name = g_strdup_printf ("subtitle_%02u", demux->n_subtitle_streams++);
tmpl =
gst_static_pad_template_get (&gst_dash_demux_subtitlesrc_template);
} else {
return NULL;
}
break;
default:
g_assert_not_reached ();
return NULL;
}
/* Create and activate new pads */
pad = gst_pad_new_from_template (tmpl, name);
g_free (name);
gst_object_unref (tmpl);
gst_pad_set_active (pad, TRUE);
GST_INFO_OBJECT (demux, "Creating srcpad %s:%s", GST_DEBUG_PAD_NAME (pad));
return pad;
}
static void
gst_dash_demux_reset (GstAdaptiveDemux * ademux)
{
GstDashDemux *demux = GST_DASH_DEMUX_CAST (ademux);
GST_DEBUG_OBJECT (demux, "Resetting demux");
demux->end_of_period = FALSE;
demux->end_of_manifest = FALSE;
if (demux->client) {
gst_mpd_client_free (demux->client);
demux->client = NULL;
}
gst_dash_demux_clock_drift_free (demux->clock_drift);
demux->clock_drift = NULL;
demux->client = gst_mpd_client_new ();
gst_mpd_client_set_uri_downloader (demux->client, ademux->downloader);
demux->n_audio_streams = 0;
demux->n_video_streams = 0;
demux->n_subtitle_streams = 0;
demux->trickmode_no_audio = FALSE;
demux->allow_trickmode_key_units = TRUE;
}
static GstCaps *
gst_dash_demux_get_video_input_caps (GstDashDemux * demux,
GstActiveStream * stream)
{
guint width = 0, height = 0;
gint fps_num = 0, fps_den = 1;
gboolean have_fps = FALSE;
GstCaps *caps = NULL;
if (stream == NULL)
return NULL;
/* if bitstreamSwitching is true we don't need to switch pads on resolution change */
if (!gst_mpd_client_get_bitstream_switching_flag (stream)) {
width = gst_mpd_client_get_video_stream_width (stream);
height = gst_mpd_client_get_video_stream_height (stream);
have_fps =
gst_mpd_client_get_video_stream_framerate (stream, &fps_num, &fps_den);
}
caps = gst_mpd_client_get_stream_caps (stream);
if (caps == NULL)
return NULL;
if (width > 0 && height > 0) {
gst_caps_set_simple (caps, "width", G_TYPE_INT, width, "height",
G_TYPE_INT, height, NULL);
}
if (have_fps) {
gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION, fps_num,
fps_den, NULL);
}
return caps;
}
static GstCaps *
gst_dash_demux_get_audio_input_caps (GstDashDemux * demux,
GstActiveStream * stream)
{
guint rate = 0, channels = 0;
GstCaps *caps = NULL;
if (stream == NULL)
return NULL;
/* if bitstreamSwitching is true we don't need to switch pads on rate/channels change */
if (!gst_mpd_client_get_bitstream_switching_flag (stream)) {
channels = gst_mpd_client_get_audio_stream_num_channels (stream);
rate = gst_mpd_client_get_audio_stream_rate (stream);
}
caps = gst_mpd_client_get_stream_caps (stream);
if (caps == NULL)
return NULL;
if (rate > 0) {
gst_caps_set_simple (caps, "rate", G_TYPE_INT, rate, NULL);
}
if (channels > 0) {
gst_caps_set_simple (caps, "channels", G_TYPE_INT, channels, NULL);
}
return caps;
}
static GstCaps *
gst_dash_demux_get_application_input_caps (GstDashDemux * demux,
GstActiveStream * stream)
{
GstCaps *caps = NULL;
if (stream == NULL)
return NULL;
caps = gst_mpd_client_get_stream_caps (stream);
if (caps == NULL)
return NULL;
return caps;
}
static GstCaps *
gst_dash_demux_get_input_caps (GstDashDemux * demux, GstActiveStream * stream)
{
switch (stream->mimeType) {
case GST_STREAM_VIDEO:
return gst_dash_demux_get_video_input_caps (demux, stream);
case GST_STREAM_AUDIO:
return gst_dash_demux_get_audio_input_caps (demux, stream);
case GST_STREAM_APPLICATION:
return gst_dash_demux_get_application_input_caps (demux, stream);
default:
return GST_CAPS_NONE;
}
}
static void
gst_dash_demux_stream_update_headers_info (GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux);
gchar *path = NULL;
gst_mpd_client_get_next_header (dashdemux->client,
&path, dashstream->index,
&stream->fragment.header_range_start, &stream->fragment.header_range_end);
if (path != NULL) {
stream->fragment.header_uri =
gst_uri_join_strings (gst_mpd_client_get_baseURL (dashdemux->client,
dashstream->index), path);
g_free (path);
path = NULL;
}
gst_mpd_client_get_next_header_index (dashdemux->client,
&path, dashstream->index,
&stream->fragment.index_range_start, &stream->fragment.index_range_end);
if (path != NULL) {
stream->fragment.index_uri =
gst_uri_join_strings (gst_mpd_client_get_baseURL (dashdemux->client,
dashstream->index), path);
g_free (path);
}
}
static GstFlowReturn
gst_dash_demux_stream_update_fragment_info (GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux);
GstClockTime ts;
GstMediaFragmentInfo fragment;
gboolean isombff;
gst_adaptive_demux_stream_fragment_clear (&stream->fragment);
isombff = gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client);
/* Reset chunk size if any */
stream->fragment.chunk_size = 0;
dashstream->current_fragment_keyframe_distance = GST_CLOCK_TIME_NONE;
if (GST_ADAPTIVE_DEMUX_STREAM_NEED_HEADER (stream) && isombff) {
gst_dash_demux_stream_update_headers_info (stream);
/* sidx entries may not be available in here */
if (stream->fragment.index_uri
&& dashstream->sidx_position != GST_CLOCK_TIME_NONE) {
/* request only the index to be downloaded as we need to reposition the
* stream to a subsegment */
return GST_FLOW_OK;
}
}
if (dashstream->moof_sync_samples
&& GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (dashdemux)) {
GstDashStreamSyncSample *sync_sample =
&g_array_index (dashstream->moof_sync_samples, GstDashStreamSyncSample,
dashstream->current_sync_sample);
gst_mpd_client_get_next_fragment (dashdemux->client, dashstream->index,
&fragment);
if (isombff && dashstream->sidx_position != GST_CLOCK_TIME_NONE
&& SIDX (dashstream)->entries) {
GstSidxBoxEntry *entry = SIDX_CURRENT_ENTRY (dashstream);
dashstream->current_fragment_timestamp = fragment.timestamp = entry->pts;
dashstream->current_fragment_duration = fragment.duration =
entry->duration;
} else {
dashstream->current_fragment_timestamp = fragment.timestamp;
dashstream->current_fragment_duration = fragment.duration;
}
dashstream->current_fragment_keyframe_distance =
fragment.duration / dashstream->moof_sync_samples->len;
dashstream->actual_position =
fragment.timestamp +
dashstream->current_sync_sample *
dashstream->current_fragment_keyframe_distance;
if (stream->segment.rate < 0.0)
dashstream->actual_position +=
dashstream->current_fragment_keyframe_distance;
dashstream->actual_position =
MIN (dashstream->actual_position,
fragment.timestamp + fragment.duration);
stream->fragment.uri = fragment.uri;
stream->fragment.timestamp = GST_CLOCK_TIME_NONE;
stream->fragment.duration = GST_CLOCK_TIME_NONE;
stream->fragment.range_start = sync_sample->start_offset;
stream->fragment.range_end = sync_sample->end_offset;
GST_DEBUG_OBJECT (stream->pad, "Actual position %" GST_TIME_FORMAT,
GST_TIME_ARGS (dashstream->actual_position));
return GST_FLOW_OK;
}
if (gst_mpd_client_get_next_fragment_timestamp (dashdemux->client,
dashstream->index, &ts)) {
if (GST_ADAPTIVE_DEMUX_STREAM_NEED_HEADER (stream)) {
gst_adaptive_demux_stream_fragment_clear (&stream->fragment);
gst_dash_demux_stream_update_headers_info (stream);
}
gst_mpd_client_get_next_fragment (dashdemux->client, dashstream->index,
&fragment);
stream->fragment.uri = fragment.uri;
/* If mpd does not specify indexRange (i.e., null index_uri),
* sidx entries may not be available until download it */
if (isombff && dashstream->sidx_position != GST_CLOCK_TIME_NONE
&& SIDX (dashstream)->entries) {
GstSidxBoxEntry *entry = SIDX_CURRENT_ENTRY (dashstream);
stream->fragment.range_start =
dashstream->sidx_base_offset + entry->offset;
dashstream->actual_position = stream->fragment.timestamp = entry->pts;
dashstream->current_fragment_timestamp = stream->fragment.timestamp =
entry->pts;
dashstream->current_fragment_duration = stream->fragment.duration =
entry->duration;
if (stream->demux->segment.rate < 0.0) {
stream->fragment.range_end =
stream->fragment.range_start + entry->size - 1;
dashstream->actual_position += entry->duration;
} else {
stream->fragment.range_end = fragment.range_end;
}
} else {
dashstream->actual_position = stream->fragment.timestamp =
fragment.timestamp;
dashstream->current_fragment_timestamp = fragment.timestamp;
dashstream->current_fragment_duration = stream->fragment.duration =
fragment.duration;
if (stream->demux->segment.rate < 0.0)
dashstream->actual_position += fragment.duration;
stream->fragment.range_start =
MAX (fragment.range_start, dashstream->sidx_base_offset);
stream->fragment.range_end = fragment.range_end;
}
GST_DEBUG_OBJECT (stream->pad, "Actual position %" GST_TIME_FORMAT,
GST_TIME_ARGS (dashstream->actual_position));
return GST_FLOW_OK;
}
return GST_FLOW_EOS;
}
static gint
gst_dash_demux_index_entry_search (GstSidxBoxEntry * entry, GstClockTime * ts,
gpointer user_data)
{
GstClockTime entry_ts = entry->pts + entry->duration;
if (entry_ts <= *ts)
return -1;
else if (entry->pts > *ts)
return 1;
else
return 0;
}
static GstFlowReturn
gst_dash_demux_stream_sidx_seek (GstDashDemuxStream * dashstream,
gboolean forward, GstSeekFlags flags, GstClockTime ts,
GstClockTime * final_ts)
{
GstSidxBox *sidx = SIDX (dashstream);
GstSidxBoxEntry *entry;
gint idx = sidx->entries_count;
GstFlowReturn ret = GST_FLOW_OK;
if (sidx->entries_count == 0)
return GST_FLOW_EOS;
entry =
gst_util_array_binary_search (sidx->entries, sidx->entries_count,
sizeof (GstSidxBoxEntry),
(GCompareDataFunc) gst_dash_demux_index_entry_search,
GST_SEARCH_MODE_EXACT, &ts, NULL);
/* No exact match found, nothing in our index
* This is usually a bug or broken stream, as the seeking code already
* makes sure that we're in the correct period and segment, and only need
* to find the correct place inside the segment. Allow for some rounding
* errors and inaccuracies here though */
if (!entry) {
GstSidxBoxEntry *last_entry = &sidx->entries[sidx->entries_count - 1];
GST_WARNING_OBJECT (dashstream->parent.pad, "Couldn't find SIDX entry");
if (ts < sidx->entries[0].pts
&& ts + 250 * GST_MSECOND >= sidx->entries[0].pts)
entry = &sidx->entries[0];
else if (ts >= last_entry->pts + last_entry->duration &&
ts < last_entry->pts + last_entry->duration + 250 * GST_MSECOND)
entry = last_entry;
}
if (!entry)
return GST_FLOW_EOS;
idx = entry - sidx->entries;
/* FIXME in reverse mode, if we are exactly at a fragment start it makes more
* sense to start from the end of the previous fragment */
if (!forward && idx > 0 && entry->pts == ts) {
idx--;
entry = &sidx->entries[idx];
}
/* Now entry->pts <= ts < entry->pts + entry->duration, need to adjust for
* snapping */
if ((flags & GST_SEEK_FLAG_SNAP_NEAREST) == GST_SEEK_FLAG_SNAP_NEAREST) {
if (idx + 1 < sidx->entries_count
&& sidx->entries[idx + 1].pts - ts < ts - sidx->entries[idx].pts)
idx += 1;
} else if ((forward && (flags & GST_SEEK_FLAG_SNAP_AFTER)) || (!forward
&& (flags & GST_SEEK_FLAG_SNAP_BEFORE))) {
if (idx + 1 < sidx->entries_count && entry->pts < ts)
idx += 1;
}
g_assert (sidx->entry_index < sidx->entries_count);
sidx->entry_index = idx;
dashstream->sidx_position = sidx->entries[idx].pts;
if (final_ts)
*final_ts = dashstream->sidx_position;
return ret;
}
static GstFlowReturn
gst_dash_demux_stream_seek (GstAdaptiveDemuxStream * stream, gboolean forward,
GstSeekFlags flags, GstClockTime ts, GstClockTime * final_ts)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux);
gint last_index, last_repeat;
gboolean is_isobmff;
last_index = dashstream->active_stream->segment_index;
last_repeat = dashstream->active_stream->segment_repeat_index;
if (dashstream->adapter)
gst_adapter_clear (dashstream->adapter);
dashstream->current_offset = -1;
dashstream->current_index_header_or_data = 0;
dashstream->isobmff_parser.current_fourcc = 0;
dashstream->isobmff_parser.current_start_offset = 0;
dashstream->isobmff_parser.current_size = 0;
if (dashstream->moof)
gst_isoff_moof_box_free (dashstream->moof);
dashstream->moof = NULL;
if (dashstream->moof_sync_samples)
g_array_free (dashstream->moof_sync_samples, TRUE);
dashstream->moof_sync_samples = NULL;
dashstream->current_sync_sample = -1;
dashstream->target_time = GST_CLOCK_TIME_NONE;
is_isobmff = gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client);
if (!gst_mpd_client_stream_seek (dashdemux->client, dashstream->active_stream,
forward,
is_isobmff ? (flags & (~(GST_SEEK_FLAG_SNAP_BEFORE |
GST_SEEK_FLAG_SNAP_AFTER))) : flags, ts, final_ts)) {
return GST_FLOW_EOS;
}
if (is_isobmff) {
GstClockTime period_start, offset;
period_start = gst_mpd_client_get_period_start_time (dashdemux->client);
offset =
gst_mpd_client_get_stream_presentation_offset (dashdemux->client,
dashstream->index);
if (G_UNLIKELY (ts < period_start))
ts = offset;
else
ts += offset - period_start;
if (last_index != dashstream->active_stream->segment_index ||
last_repeat != dashstream->active_stream->segment_repeat_index) {
GST_LOG_OBJECT (stream->pad,
"Segment index was changed, reset sidx parser");
gst_isoff_sidx_parser_clear (&dashstream->sidx_parser);
dashstream->sidx_base_offset = 0;
dashstream->allow_sidx = TRUE;
}
if (dashstream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) {
if (gst_dash_demux_stream_sidx_seek (dashstream, forward, flags, ts,
final_ts) != GST_FLOW_OK) {
GST_ERROR_OBJECT (stream->pad, "Couldn't find position in sidx");
dashstream->sidx_position = GST_CLOCK_TIME_NONE;
gst_isoff_sidx_parser_clear (&dashstream->sidx_parser);
}
dashstream->pending_seek_ts = GST_CLOCK_TIME_NONE;
} else {
/* no index yet, seek when we have it */
/* FIXME - the final_ts won't be correct here */
dashstream->pending_seek_ts = ts;
}
}
stream->discont = TRUE;
return GST_FLOW_OK;
}
static gboolean
gst_dash_demux_stream_has_next_sync_sample (GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
if (dashstream->moof_sync_samples &&
GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (stream->demux)) {
if (stream->demux->segment.rate > 0.0) {
if (dashstream->current_sync_sample + 1 <
dashstream->moof_sync_samples->len)
return TRUE;
} else {
if (dashstream->current_sync_sample >= 1)
return TRUE;
}
}
return FALSE;
}
static gboolean
gst_dash_demux_stream_has_next_subfragment (GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GstSidxBox *sidx = SIDX (dashstream);
if (dashstream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) {
if (stream->demux->segment.rate > 0.0) {
if (sidx->entry_index + 1 < sidx->entries_count)
return TRUE;
} else {
if (sidx->entry_index >= 1)
return TRUE;
}
}
return FALSE;
}
static gboolean
gst_dash_demux_stream_advance_sync_sample (GstAdaptiveDemuxStream * stream,
GstClockTime target_time)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
gboolean fragment_finished = FALSE;
guint idx = -1;
if (GST_CLOCK_TIME_IS_VALID (target_time)) {
GST_LOG_OBJECT (stream->pad,
"target_time:%" GST_TIME_FORMAT " fragment ts %" GST_TIME_FORMAT
" average keyframe dist: %" GST_TIME_FORMAT
" current keyframe dist: %" GST_TIME_FORMAT
" fragment duration:%" GST_TIME_FORMAT,
GST_TIME_ARGS (target_time),
GST_TIME_ARGS (dashstream->current_fragment_timestamp),
GST_TIME_ARGS (dashstream->keyframe_average_distance),
GST_TIME_ARGS (dashstream->current_fragment_keyframe_distance),
GST_TIME_ARGS (stream->fragment.duration));
if (stream->demux->segment.rate > 0.0) {
idx =
(target_time -
dashstream->current_fragment_timestamp) /
dashstream->current_fragment_keyframe_distance;
/* Prevent getting stuck in a loop due to rounding errors */
if (idx == dashstream->current_sync_sample)
idx++;
} else {
GstClockTime end_time =
dashstream->current_fragment_timestamp +
dashstream->current_fragment_duration;
if (end_time < target_time) {
idx = dashstream->moof_sync_samples->len;
} else {
idx =
(end_time -
target_time) / dashstream->current_fragment_keyframe_distance;
if (idx == dashstream->moof_sync_samples->len) {
dashstream->current_sync_sample = -1;
fragment_finished = TRUE;
goto beach;
}
idx = dashstream->moof_sync_samples->len - 1 - idx;
}
/* Prevent getting stuck in a loop due to rounding errors */
if (idx == dashstream->current_sync_sample) {
if (idx == 0) {
dashstream->current_sync_sample = -1;
fragment_finished = TRUE;
goto beach;
}
idx--;
}
}
}
GST_DEBUG_OBJECT (stream->pad,
"Advancing sync sample #%d target #%d",
dashstream->current_sync_sample, idx);
if (idx != -1 && idx >= dashstream->moof_sync_samples->len) {
dashstream->current_sync_sample = -1;
fragment_finished = TRUE;
goto beach;
}
if (stream->demux->segment.rate > 0.0) {
/* Try to get the sync sample for the target time */
if (idx != -1) {
dashstream->current_sync_sample = idx;
} else {
dashstream->current_sync_sample++;
if (dashstream->current_sync_sample >= dashstream->moof_sync_samples->len) {
fragment_finished = TRUE;
}
}
} else {
if (idx != -1) {
dashstream->current_sync_sample = idx;
} else if (dashstream->current_sync_sample == -1) {
dashstream->current_sync_sample = dashstream->moof_sync_samples->len - 1;
} else if (dashstream->current_sync_sample == 0) {
dashstream->current_sync_sample = -1;
fragment_finished = TRUE;
} else {
dashstream->current_sync_sample--;
}
}
beach:
GST_DEBUG_OBJECT (stream->pad,
"Advancing sync sample #%d fragment_finished:%d",
dashstream->current_sync_sample, fragment_finished);
if (!fragment_finished)
stream->discont = TRUE;
return !fragment_finished;
}
static gboolean
gst_dash_demux_stream_advance_subfragment (GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GstSidxBox *sidx = SIDX (dashstream);
gboolean fragment_finished = TRUE;
if (dashstream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) {
if (stream->demux->segment.rate > 0.0) {
gint idx = ++sidx->entry_index;
if (idx < sidx->entries_count) {
fragment_finished = FALSE;
}
if (idx == sidx->entries_count)
dashstream->sidx_position =
sidx->entries[idx - 1].pts + sidx->entries[idx - 1].duration;
else
dashstream->sidx_position = sidx->entries[idx].pts;
} else {
gint idx = --sidx->entry_index;
if (idx >= 0) {
fragment_finished = FALSE;
dashstream->sidx_position = sidx->entries[idx].pts;
} else {
dashstream->sidx_position = GST_CLOCK_TIME_NONE;
}
}
}
GST_DEBUG_OBJECT (stream->pad, "New sidx index: %d / %d. "
"Finished fragment: %d", sidx->entry_index, sidx->entries_count,
fragment_finished);
return !fragment_finished;
}
static gboolean
gst_dash_demux_stream_has_next_fragment (GstAdaptiveDemuxStream * stream)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux);
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
if (dashstream->moof_sync_samples &&
GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (dashdemux)) {
if (gst_dash_demux_stream_has_next_sync_sample (stream))
return TRUE;
}
if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)) {
if (gst_dash_demux_stream_has_next_subfragment (stream))
return TRUE;
}
return gst_mpd_client_has_next_segment (dashdemux->client,
dashstream->active_stream, stream->demux->segment.rate > 0.0);
}
/* The goal here is to figure out, once we have pushed a keyframe downstream,
* what the next ideal keyframe to download is.
*
* This is done based on:
* * the current internal position (i.e. actual_position)
* * the reported downstream position (QoS feedback)
* * the average keyframe download time (average_download_time)
*/
static GstClockTime
gst_dash_demux_stream_get_target_time (GstDashDemux * dashdemux,
GstAdaptiveDemuxStream * stream, GstClockTime cur_position,
GstClockTime min_skip)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GstClockTime cur_running, min_running, min_position;
GstClockTimeDiff diff;
GstClockTime ret = cur_position;
GstClockTime deadline;
GstClockTime earliest_time = GST_CLOCK_TIME_NONE;
g_assert (min_skip > 0);
/* minimum stream position we have to skip to */
if (stream->segment.rate > 0)
min_position = cur_position + min_skip;
else if (cur_position < min_skip)
min_position = 0;
else
min_position = cur_position - min_skip;
/* Use current clock time or the QoS earliest time, whichever is further in
* the future. The QoS time is only updated on every QoS event and
* especially not if e.g. a videodecoder or converter drops a frame further
* downstream.
*
* We only use the times if we ever received a QoS event since the last
* flush, as otherwise base_time and clock might not be correct because of a
* still pre-rolling sink
*/
if (stream->qos_earliest_time != GST_CLOCK_TIME_NONE) {
GstClock *clock;
clock = gst_element_get_clock (GST_ELEMENT_CAST (dashdemux));
if (clock) {
GstClockTime base_time;
GstClockTime now_time;
base_time = gst_element_get_base_time (GST_ELEMENT_CAST (dashdemux));
now_time = gst_clock_get_time (clock);
if (now_time > base_time)
now_time -= base_time;
else
now_time = 0;
gst_object_unref (clock);
earliest_time = MAX (now_time, stream->qos_earliest_time);
} else {
earliest_time = stream->qos_earliest_time;
}
}
/* our current position in running time */
cur_running =
gst_segment_to_running_time (&stream->segment, GST_FORMAT_TIME,
cur_position);
/* the minimum position we have to skip to in running time */
min_running =
gst_segment_to_running_time (&stream->segment, GST_FORMAT_TIME,
min_position);
GST_DEBUG_OBJECT (stream->pad,
"position: current %" GST_TIME_FORMAT " min next %" GST_TIME_FORMAT,
GST_TIME_ARGS (cur_position), GST_TIME_ARGS (min_position));
GST_DEBUG_OBJECT (stream->pad,
"running time: current %" GST_TIME_FORMAT " min next %" GST_TIME_FORMAT
" earliest %" GST_TIME_FORMAT, GST_TIME_ARGS (cur_running),
GST_TIME_ARGS (min_running), GST_TIME_ARGS (earliest_time));
/* Take configured maximum video bandwidth and framerate into account */
{
GstClockTime min_run_dist, min_frame_dist, diff = 0;
guint max_fps_n, max_fps_d;
min_run_dist = min_skip / ABS (stream->segment.rate);
if (dashdemux->max_video_framerate_n != 0) {
max_fps_n = dashdemux->max_video_framerate_n;
max_fps_d = dashdemux->max_video_framerate_d;
} else {
/* more than 10 fps is not very useful if we're skipping anyway */
max_fps_n = 10;
max_fps_d = 1;
}
min_frame_dist = gst_util_uint64_scale_ceil (GST_SECOND,
max_fps_d, max_fps_n);
GST_DEBUG_OBJECT (stream->pad,
"Have max framerate %d/%d - Min dist %" GST_TIME_FORMAT
", min requested dist %" GST_TIME_FORMAT,
max_fps_n, max_fps_d,
GST_TIME_ARGS (min_run_dist), GST_TIME_ARGS (min_frame_dist));
if (min_frame_dist > min_run_dist)
diff = MAX (diff, min_frame_dist - min_run_dist);
if (dashdemux->max_bitrate != 0) {
guint64 max_bitrate = gst_util_uint64_scale_ceil (GST_SECOND,
8 * dashstream->keyframe_average_size,
dashstream->keyframe_average_distance) * ABS (stream->segment.rate);
if (max_bitrate > dashdemux->max_bitrate) {
min_frame_dist = gst_util_uint64_scale_ceil (GST_SECOND,
8 * dashstream->keyframe_average_size,
dashdemux->max_bitrate) * ABS (stream->segment.rate);
GST_DEBUG_OBJECT (stream->pad,
"Have max bitrate %u - Min dist %" GST_TIME_FORMAT
", min requested dist %" GST_TIME_FORMAT, dashdemux->max_bitrate,
GST_TIME_ARGS (min_run_dist), GST_TIME_ARGS (min_frame_dist));
if (min_frame_dist > min_run_dist)
diff = MAX (diff, min_frame_dist - min_run_dist);
}
}
if (diff > 0) {
GST_DEBUG_OBJECT (stream->pad,
"Skipping further ahead by %" GST_TIME_FORMAT, GST_TIME_ARGS (diff));
min_running += diff;
}
}
if (earliest_time == GST_CLOCK_TIME_NONE) {
GstClockTime run_key_dist;
run_key_dist =
dashstream->keyframe_average_distance / ABS (stream->segment.rate);
/* If we don't have downstream information (such as at startup or
* without live sinks), just get the next time by taking the minimum
* amount we have to skip ahead
* Except if it takes us longer to download */
if (run_key_dist > dashstream->average_download_time)
ret =
gst_segment_position_from_running_time (&stream->segment,
GST_FORMAT_TIME, min_running);
else
ret = gst_segment_position_from_running_time (&stream->segment,
GST_FORMAT_TIME,
min_running - run_key_dist + dashstream->average_download_time);
GST_DEBUG_OBJECT (stream->pad,
"Advancing to %" GST_TIME_FORMAT " (was %" GST_TIME_FORMAT ")",
GST_TIME_ARGS (ret), GST_TIME_ARGS (min_position));
goto out;
}
/* Figure out the difference, in running time, between where we are and
* where downstream is */
diff = min_running - earliest_time;
GST_LOG_OBJECT (stream->pad,
"min_running %" GST_TIME_FORMAT " diff %" GST_STIME_FORMAT
" average_download %" GST_TIME_FORMAT, GST_TIME_ARGS (min_running),
GST_STIME_ARGS (diff), GST_TIME_ARGS (dashstream->average_download_time));
/* Have at least 500ms or 3 keyframes safety between current position and downstream */
deadline = MAX (500 * GST_MSECOND, 3 * dashstream->average_download_time);
/* The furthest away we are from the current position, the least we need to advance */
if (diff < 0 || diff < deadline) {
/* Force skipping (but not more than 1s ahead) */
ret =
gst_segment_position_from_running_time (&stream->segment,
GST_FORMAT_TIME, earliest_time + MIN (deadline, GST_SECOND));
GST_DEBUG_OBJECT (stream->pad,
"MUST SKIP to at least %" GST_TIME_FORMAT " (was %" GST_TIME_FORMAT ")",
GST_TIME_ARGS (ret), GST_TIME_ARGS (min_position));
} else if (diff < 4 * dashstream->average_download_time) {
/* Go forward a bit less aggressively (and at most 1s forward) */
ret = gst_segment_position_from_running_time (&stream->segment,
GST_FORMAT_TIME, min_running + MIN (GST_SECOND,
2 * dashstream->average_download_time));
GST_DEBUG_OBJECT (stream->pad,
"MUST SKIP to at least %" GST_TIME_FORMAT " (was %" GST_TIME_FORMAT ")",
GST_TIME_ARGS (ret), GST_TIME_ARGS (min_position));
} else {
/* Get the next position satisfying the download time */
ret = gst_segment_position_from_running_time (&stream->segment,
GST_FORMAT_TIME, min_running);
GST_DEBUG_OBJECT (stream->pad,
"Advance to %" GST_TIME_FORMAT " (was %" GST_TIME_FORMAT ")",
GST_TIME_ARGS (ret), GST_TIME_ARGS (min_position));
}
out:
{
GstClockTime cur_skip =
(cur_position < ret) ? ret - cur_position : cur_position - ret;
if (dashstream->average_skip_size == 0) {
dashstream->average_skip_size = cur_skip;
} else {
dashstream->average_skip_size =
(cur_skip + 3 * dashstream->average_skip_size) / 4;
}
if (dashstream->average_skip_size >
cur_skip + dashstream->keyframe_average_distance
&& dashstream->average_skip_size > min_skip) {
if (stream->segment.rate > 0)
ret = cur_position + dashstream->average_skip_size;
else if (cur_position > dashstream->average_skip_size)
ret = cur_position - dashstream->average_skip_size;
else
ret = 0;
}
}
return ret;
}
static GstFlowReturn
gst_dash_demux_stream_advance_fragment (GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux);
GstClockTime target_time = GST_CLOCK_TIME_NONE;
GstClockTime previous_position;
GstFlowReturn ret;
GST_DEBUG_OBJECT (stream->pad, "Advance fragment");
/* Update download statistics */
if (dashstream->moof_sync_samples &&
GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (dashdemux) &&
GST_CLOCK_TIME_IS_VALID (stream->last_download_time)) {
if (GST_CLOCK_TIME_IS_VALID (dashstream->average_download_time)) {
dashstream->average_download_time =
(3 * dashstream->average_download_time +
stream->last_download_time) / 4;
} else {
dashstream->average_download_time = stream->last_download_time;
}
GST_DEBUG_OBJECT (stream->pad,
"Download time last: %" GST_TIME_FORMAT " average: %" GST_TIME_FORMAT,
GST_TIME_ARGS (stream->last_download_time),
GST_TIME_ARGS (dashstream->average_download_time));
}
previous_position = dashstream->actual_position;
/* Update internal position */
if (GST_CLOCK_TIME_IS_VALID (dashstream->actual_position)) {
GstClockTime dur;
if (dashstream->moof_sync_samples
&& GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (dashdemux)) {
GST_LOG_OBJECT (stream->pad, "current sync sample #%d",
dashstream->current_sync_sample);
if (dashstream->current_sync_sample == -1) {
dur = 0;
} else if (dashstream->current_sync_sample <
dashstream->moof_sync_samples->len) {
dur = dashstream->current_fragment_keyframe_distance;
} else {
if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client) &&
dashstream->sidx_position != GST_CLOCK_TIME_NONE
&& SIDX (dashstream)->entries) {
GstSidxBoxEntry *entry = SIDX_CURRENT_ENTRY (dashstream);
dur = entry->duration;
} else {
dur =
dashstream->current_fragment_timestamp +
dashstream->current_fragment_duration -
dashstream->actual_position;
}
}
} else if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client) &&
dashstream->sidx_position != GST_CLOCK_TIME_NONE
&& SIDX (dashstream)->entries) {
GstSidxBoxEntry *entry = SIDX_CURRENT_ENTRY (dashstream);
dur = entry->duration;
} else {
dur = stream->fragment.duration;
}
if (dashstream->moof_sync_samples
&& GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (dashdemux)) {
/* We just downloaded the header, we actually use the previous
* target_time now as it was not used up yet */
if (dashstream->current_sync_sample == -1)
target_time = dashstream->target_time;
else
target_time =
gst_dash_demux_stream_get_target_time (dashdemux, stream,
dashstream->actual_position, dur);
dashstream->actual_position = target_time;
} else {
/* Adjust based on direction */
if (stream->demux->segment.rate > 0.0)
dashstream->actual_position += dur;
else if (dashstream->actual_position >= dur)
dashstream->actual_position -= dur;
else
dashstream->actual_position = 0;
}
GST_DEBUG_OBJECT (stream->pad, "Actual position %" GST_TIME_FORMAT,
GST_TIME_ARGS (dashstream->actual_position));
}
dashstream->target_time = target_time;
GST_DEBUG_OBJECT (stream->pad, "target_time: %" GST_TIME_FORMAT,
GST_TIME_ARGS (target_time));
/* If downloading only keyframes, switch to the next one or fall through */
if (dashstream->moof_sync_samples &&
GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (dashdemux)) {
if (gst_dash_demux_stream_advance_sync_sample (stream, target_time))
return GST_FLOW_OK;
}
dashstream->isobmff_parser.current_fourcc = 0;
dashstream->isobmff_parser.current_start_offset = 0;
dashstream->isobmff_parser.current_size = 0;
if (dashstream->moof)
gst_isoff_moof_box_free (dashstream->moof);
dashstream->moof = NULL;
if (dashstream->moof_sync_samples)
g_array_free (dashstream->moof_sync_samples, TRUE);
dashstream->moof_sync_samples = NULL;
dashstream->current_sync_sample = -1;
/* Check if we just need to 'advance' to the next fragment, or if we
* need to skip by more. */
if (GST_CLOCK_TIME_IS_VALID (target_time)
&& GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (stream->demux) &&
dashstream->active_stream->mimeType == GST_STREAM_VIDEO) {
GstClockTime actual_ts;
GstSeekFlags flags = 0;
/* Key-unit trick mode, seek to fragment containing target time
*
* We first try seeking without snapping. As above code to skip keyframes
* in the current fragment was not successful, we should go at least one
* fragment ahead. Due to rounding errors we could end up at the same
* fragment again here, in which case we retry seeking with the SNAP_AFTER
* flag.
*
* We don't always set that flag as we would then end up one further
* fragment in the future in all good cases.
*/
while (TRUE) {
ret =
gst_dash_demux_stream_seek (stream, (stream->segment.rate > 0), flags,
target_time, &actual_ts);
if (ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (stream->pad, "Failed to seek to %" GST_TIME_FORMAT,
GST_TIME_ARGS (target_time));
/* Give up */
if (flags != 0)
break;
/* Retry with skipping ahead */
flags |= GST_SEEK_FLAG_SNAP_AFTER;
continue;
}
GST_DEBUG_OBJECT (stream->pad,
"Skipped to %" GST_TIME_FORMAT " (wanted %" GST_TIME_FORMAT ", was %"
GST_TIME_FORMAT ")", GST_TIME_ARGS (actual_ts),
GST_TIME_ARGS (target_time), GST_TIME_ARGS (previous_position));
if ((stream->segment.rate > 0 && actual_ts <= previous_position) ||
(stream->segment.rate < 0 && actual_ts >= previous_position)) {
/* Give up */
if (flags != 0)
break;
/* Retry with forcing skipping ahead */
flags |= GST_SEEK_FLAG_SNAP_AFTER;
continue;
}
/* All good */
break;
}
} else {
/* Normal mode, advance to the next fragment */
if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)) {
if (gst_dash_demux_stream_advance_subfragment (stream))
return GST_FLOW_OK;
}
if (dashstream->adapter)
gst_adapter_clear (dashstream->adapter);
gst_isoff_sidx_parser_clear (&dashstream->sidx_parser);
dashstream->sidx_base_offset = 0;
dashstream->sidx_position = GST_CLOCK_TIME_NONE;
dashstream->allow_sidx = TRUE;
ret = gst_mpd_client_advance_segment (dashdemux->client,
dashstream->active_stream, stream->demux->segment.rate > 0.0);
}
return ret;
}
static gboolean
gst_dash_demux_stream_select_bitrate (GstAdaptiveDemuxStream * stream,
guint64 bitrate)
{
GstActiveStream *active_stream = NULL;
GList *rep_list = NULL;
gint new_index;
GstAdaptiveDemux *base_demux = stream->demux;
GstDashDemux *demux = GST_DASH_DEMUX_CAST (stream->demux);
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
gboolean ret = FALSE;
active_stream = dashstream->active_stream;
if (active_stream == NULL) {
goto end;
}
/* In key-frame trick mode don't change bitrates */
if (GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (demux)) {
GST_DEBUG_OBJECT (demux, "In key-frame trick mode, not changing bitrates");
goto end;
}
/* retrieve representation list */
if (active_stream->cur_adapt_set)
rep_list = active_stream->cur_adapt_set->Representations;
if (!rep_list) {
goto end;
}
GST_DEBUG_OBJECT (stream->pad,
"Trying to change to bitrate: %" G_GUINT64_FORMAT, bitrate);
if (active_stream->mimeType == GST_STREAM_VIDEO && demux->max_bitrate) {
bitrate = MIN (demux->max_bitrate, bitrate);
}
/* get representation index with current max_bandwidth */
if (GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (base_demux) ||
ABS (base_demux->segment.rate) <= 1.0) {
new_index =
gst_mpd_client_get_rep_idx_with_max_bandwidth (rep_list, bitrate,
demux->max_video_width, demux->max_video_height,
demux->max_video_framerate_n, demux->max_video_framerate_d);
} else {
new_index =
gst_mpd_client_get_rep_idx_with_max_bandwidth (rep_list,
bitrate / ABS (base_demux->segment.rate), demux->max_video_width,
demux->max_video_height, demux->max_video_framerate_n,
demux->max_video_framerate_d);
}
/* if no representation has the required bandwidth, take the lowest one */
if (new_index == -1)
new_index = gst_mpd_client_get_rep_idx_with_min_bandwidth (rep_list);
if (new_index != active_stream->representation_idx) {
GstMPDRepresentationNode *rep = g_list_nth_data (rep_list, new_index);
GST_INFO_OBJECT (demux, "Changing representation idx: %d %d %u",
dashstream->index, new_index, rep->bandwidth);
if (gst_mpd_client_setup_representation (demux->client, active_stream, rep)) {
GstCaps *caps;
GST_INFO_OBJECT (demux, "Switching bitrate to %d",
active_stream->cur_representation->bandwidth);
caps = gst_dash_demux_get_input_caps (demux, active_stream);
gst_adaptive_demux_stream_set_caps (stream, caps);
ret = TRUE;
} else {
GST_WARNING_OBJECT (demux, "Can not switch representation, aborting...");
}
}
if (ret) {
if (gst_mpd_client_has_isoff_ondemand_profile (demux->client)
&& SIDX (dashstream)->entries) {
/* store our current position to change to the same one in a different
* representation if needed */
if (SIDX (dashstream)->entry_index < SIDX (dashstream)->entries_count)
dashstream->sidx_position = SIDX_CURRENT_ENTRY (dashstream)->pts;
else if (SIDX (dashstream)->entry_index >=
SIDX (dashstream)->entries_count)
dashstream->sidx_position =
SIDX_ENTRY (dashstream,
SIDX (dashstream)->entries_count - 1)->pts + SIDX_ENTRY (dashstream,
SIDX (dashstream)->entries_count - 1)->duration;
else
dashstream->sidx_position = GST_CLOCK_TIME_NONE;
} else {
dashstream->sidx_position = GST_CLOCK_TIME_NONE;
}
gst_isoff_sidx_parser_clear (&dashstream->sidx_parser);
dashstream->sidx_base_offset = 0;
dashstream->allow_sidx = TRUE;
/* Reset ISOBMFF box parsing state */
dashstream->isobmff_parser.current_fourcc = 0;
dashstream->isobmff_parser.current_start_offset = 0;
dashstream->isobmff_parser.current_size = 0;
dashstream->current_offset = -1;
dashstream->current_index_header_or_data = 0;
if (dashstream->adapter)
gst_adapter_clear (dashstream->adapter);
if (dashstream->moof)
gst_isoff_moof_box_free (dashstream->moof);
dashstream->moof = NULL;
if (dashstream->moof_sync_samples)
g_array_free (dashstream->moof_sync_samples, TRUE);
dashstream->moof_sync_samples = NULL;
dashstream->current_sync_sample = -1;
dashstream->target_time = GST_CLOCK_TIME_NONE;
}
end:
return ret;
}
#define SEEK_UPDATES_PLAY_POSITION(r, start_type, stop_type) \
((r >= 0 && start_type != GST_SEEK_TYPE_NONE) || \
(r < 0 && stop_type != GST_SEEK_TYPE_NONE))
static gboolean
gst_dash_demux_seek (GstAdaptiveDemux * demux, GstEvent * seek)
{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
GList *list;
GstClockTime current_pos, target_pos;
guint current_period;
GstStreamPeriod *period;
GList *iter, *streams = NULL;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
gboolean trickmode_no_audio;
gst_event_parse_seek (seek, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
if (!SEEK_UPDATES_PLAY_POSITION (rate, start_type, stop_type)) {
/* nothing to do if we don't have to update the current position */
return TRUE;
}
if (demux->segment.rate > 0.0) {
target_pos = (GstClockTime) start;
} else {
target_pos = (GstClockTime) stop;
}
/* select the requested Period in the Media Presentation */
if (!gst_mpd_client_setup_media_presentation (dashdemux->client, target_pos,
-1, NULL))
return FALSE;
current_period = 0;
for (list = g_list_first (dashdemux->client->periods); list;
list = g_list_next (list)) {
period = list->data;
current_pos = period->start;
current_period = period->number;
GST_DEBUG_OBJECT (demux, "Looking at period %u) start:%"
GST_TIME_FORMAT " - duration:%"
GST_TIME_FORMAT ") for position %" GST_TIME_FORMAT,
current_period, GST_TIME_ARGS (current_pos),
GST_TIME_ARGS (period->duration), GST_TIME_ARGS (target_pos));
if (current_pos <= target_pos
&& target_pos <= current_pos + period->duration) {
break;
}
}
if (list == NULL) {
GST_WARNING_OBJECT (demux, "Could not find seeked Period");
return FALSE;
}
trickmode_no_audio = ! !(flags & GST_SEEK_FLAG_TRICKMODE_NO_AUDIO);
streams = demux->streams;
if (current_period != gst_mpd_client_get_period_index (dashdemux->client)) {
GST_DEBUG_OBJECT (demux, "Seeking to Period %d", current_period);
/* clean old active stream list, if any */
gst_mpd_client_active_streams_free (dashdemux->client);
dashdemux->trickmode_no_audio = trickmode_no_audio;
/* setup video, audio and subtitle streams, starting from the new Period */
if (!gst_mpd_client_set_period_index (dashdemux->client, current_period)
|| !gst_dash_demux_setup_all_streams (dashdemux))
return FALSE;
streams = demux->next_streams;
} else if (dashdemux->trickmode_no_audio != trickmode_no_audio) {
/* clean old active stream list, if any */
gst_mpd_client_active_streams_free (dashdemux->client);
dashdemux->trickmode_no_audio = trickmode_no_audio;
/* setup video, audio and subtitle streams, starting from the new Period */
if (!gst_dash_demux_setup_all_streams (dashdemux))
return FALSE;
streams = demux->next_streams;
}
/* Update the current sequence on all streams */
for (iter = streams; iter; iter = g_list_next (iter)) {
GstAdaptiveDemuxStream *stream = iter->data;
GstDashDemuxStream *dashstream = iter->data;
dashstream->average_skip_size = 0;
if (gst_dash_demux_stream_seek (stream, rate >= 0, 0, target_pos,
NULL) != GST_FLOW_OK)
return FALSE;
}
return TRUE;
}
static gint64
gst_dash_demux_get_manifest_update_interval (GstAdaptiveDemux * demux)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
return MIN (dashdemux->client->mpd_root_node->minimumUpdatePeriod * 1000,
SLOW_CLOCK_UPDATE_INTERVAL);
}
static GstFlowReturn
gst_dash_demux_update_manifest_data (GstAdaptiveDemux * demux,
GstBuffer * buffer)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
GstMPDClient *new_client = NULL;
GstMapInfo mapinfo;
GST_DEBUG_OBJECT (demux, "Updating manifest file from URL");
/* parse the manifest file */
new_client = gst_mpd_client_new ();
gst_mpd_client_set_uri_downloader (new_client, demux->downloader);
new_client->mpd_uri = g_strdup (demux->manifest_uri);
new_client->mpd_base_uri = g_strdup (demux->manifest_base_uri);
gst_buffer_map (buffer, &mapinfo, GST_MAP_READ);
if (gst_mpd_client_parse (new_client, (gchar *) mapinfo.data, mapinfo.size)) {
const gchar *period_id;
guint period_idx;
GList *iter;
GList *streams_iter;
GList *streams;
/* prepare the new manifest and try to transfer the stream position
* status from the old manifest client */
GST_DEBUG_OBJECT (demux, "Updating manifest");
period_id = gst_mpd_client_get_period_id (dashdemux->client);
period_idx = gst_mpd_client_get_period_index (dashdemux->client);
/* setup video, audio and subtitle streams, starting from current Period */
if (!gst_mpd_client_setup_media_presentation (new_client, -1,
(period_id ? -1 : period_idx), period_id)) {
/* TODO */
}
if (period_id) {
if (!gst_mpd_client_set_period_id (new_client, period_id)) {
GST_DEBUG_OBJECT (demux, "Error setting up the updated manifest file");
gst_mpd_client_free (new_client);
gst_buffer_unmap (buffer, &mapinfo);
return GST_FLOW_EOS;
}
} else {
if (!gst_mpd_client_set_period_index (new_client, period_idx)) {
GST_DEBUG_OBJECT (demux, "Error setting up the updated manifest file");
gst_mpd_client_free (new_client);
gst_buffer_unmap (buffer, &mapinfo);
return GST_FLOW_EOS;
}
}
if (!gst_dash_demux_setup_mpdparser_streams (dashdemux, new_client)) {
GST_ERROR_OBJECT (demux, "Failed to setup streams on manifest " "update");
gst_mpd_client_free (new_client);
gst_buffer_unmap (buffer, &mapinfo);
return GST_FLOW_ERROR;
}
/* If no pads have been exposed yet, need to use those */
streams = NULL;
if (demux->streams == NULL) {
if (demux->prepared_streams) {
streams = demux->prepared_streams;
}
} else {
streams = demux->streams;
}
/* update the streams to play from the next segment */
for (iter = streams, streams_iter = new_client->active_streams;
iter && streams_iter;
iter = g_list_next (iter), streams_iter = g_list_next (streams_iter)) {
GstDashDemuxStream *demux_stream = iter->data;
GstActiveStream *new_stream = streams_iter->data;
GstClockTime ts;
if (!new_stream) {
GST_DEBUG_OBJECT (demux,
"Stream of index %d is missing from manifest update",
demux_stream->index);
gst_mpd_client_free (new_client);
gst_buffer_unmap (buffer, &mapinfo);
return GST_FLOW_EOS;
}
if (gst_mpd_client_get_next_fragment_timestamp (dashdemux->client,
demux_stream->index, &ts)
|| gst_mpd_client_get_last_fragment_timestamp_end (dashdemux->client,
demux_stream->index, &ts)) {
/* Due to rounding when doing the timescale conversions it might happen
* that the ts falls back to a previous segment, leading the same data
* to be downloaded twice. We try to work around this by always adding
* 10 microseconds to get back to the correct segment. The errors are
* usually on the order of nanoseconds so it should be enough.
*/
/* _get_next_fragment_timestamp() returned relative timestamp to
* corresponding period start, but _client_stream_seek expects absolute
* MPD time. */
ts += gst_mpd_client_get_period_start_time (dashdemux->client);
GST_DEBUG_OBJECT (GST_ADAPTIVE_DEMUX_STREAM_PAD (demux_stream),
"Current position: %" GST_TIME_FORMAT ", updating to %"
GST_TIME_FORMAT, GST_TIME_ARGS (ts),
GST_TIME_ARGS (ts + (10 * GST_USECOND)));
ts += 10 * GST_USECOND;
gst_mpd_client_stream_seek (new_client, new_stream,
demux->segment.rate >= 0, 0, ts, NULL);
}
demux_stream->active_stream = new_stream;
}
gst_mpd_client_free (dashdemux->client);
dashdemux->client = new_client;
GST_DEBUG_OBJECT (demux, "Manifest file successfully updated");
if (dashdemux->clock_drift) {
gst_dash_demux_poll_clock_drift (dashdemux);
}
} else {
/* In most cases, this will happen if we set a wrong url in the
* source element and we have received the 404 HTML response instead of
* the manifest */
GST_WARNING_OBJECT (demux, "Error parsing the manifest.");
gst_mpd_client_free (new_client);
gst_buffer_unmap (buffer, &mapinfo);
return GST_FLOW_ERROR;
}
gst_buffer_unmap (buffer, &mapinfo);
return GST_FLOW_OK;
}
static gint64
gst_dash_demux_stream_get_fragment_waiting_time (GstAdaptiveDemuxStream *
stream)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux);
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GstDateTime *segmentAvailability;
GstActiveStream *active_stream = dashstream->active_stream;
segmentAvailability =
gst_mpd_client_get_next_segment_availability_start_time
(dashdemux->client, active_stream);
if (segmentAvailability) {
gint64 diff;
GstDateTime *cur_time;
cur_time =
gst_date_time_new_from_g_date_time
(gst_adaptive_demux_get_client_now_utc (GST_ADAPTIVE_DEMUX_CAST
(dashdemux)));
diff =
gst_mpd_client_calculate_time_difference (cur_time,
segmentAvailability);
gst_date_time_unref (segmentAvailability);
gst_date_time_unref (cur_time);
/* subtract the server's clock drift, so that if the server's
time is behind our idea of UTC, we need to sleep for longer
before requesting a fragment */
return diff -
gst_dash_demux_get_clock_compensation (dashdemux) * GST_USECOND;
}
return 0;
}
static gboolean
gst_dash_demux_has_next_period (GstAdaptiveDemux * demux)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
if (demux->segment.rate >= 0)
return gst_mpd_client_has_next_period (dashdemux->client);
else
return gst_mpd_client_has_previous_period (dashdemux->client);
}
static void
gst_dash_demux_advance_period (GstAdaptiveDemux * demux)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
if (demux->segment.rate >= 0) {
if (!gst_mpd_client_set_period_index (dashdemux->client,
gst_mpd_client_get_period_index (dashdemux->client) + 1)) {
/* TODO error */
return;
}
} else {
if (!gst_mpd_client_set_period_index (dashdemux->client,
gst_mpd_client_get_period_index (dashdemux->client) - 1)) {
/* TODO error */
return;
}
}
gst_dash_demux_setup_all_streams (dashdemux);
gst_mpd_client_seek_to_first_segment (dashdemux->client);
}
static GstBuffer *
_gst_buffer_split (GstBuffer * buffer, gint offset, gsize size)
{
GstBuffer *newbuf = gst_buffer_copy_region (buffer,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_META
| GST_BUFFER_COPY_MEMORY, offset, size == -1 ? size : size - offset);
gst_buffer_resize (buffer, 0, offset);
return newbuf;
}
static gboolean
gst_dash_demux_stream_fragment_start (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GST_LOG_OBJECT (stream->pad, "Actual position %" GST_TIME_FORMAT,
GST_TIME_ARGS (dashstream->actual_position));
dashstream->current_index_header_or_data = 0;
dashstream->current_offset = -1;
/* We need to mark every first buffer of a key unit as discont,
* and also every first buffer of a moov and moof. This ensures
* that qtdemux takes note of our buffer offsets for each of those
* buffers instead of keeping track of them itself from the first
* buffer. We need offsets to be consistent between moof and mdat
*/
if (dashstream->is_isobmff && dashdemux->allow_trickmode_key_units
&& GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (demux)
&& dashstream->active_stream->mimeType == GST_STREAM_VIDEO)
stream->discont = TRUE;
return TRUE;
}
static GstFlowReturn
gst_dash_demux_stream_fragment_finished (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream)
{
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
/* We need to mark every first buffer of a key unit as discont,
* and also every first buffer of a moov and moof. This ensures
* that qtdemux takes note of our buffer offsets for each of those
* buffers instead of keeping track of them itself from the first
* buffer. We need offsets to be consistent between moof and mdat
*/
if (dashstream->is_isobmff && dashdemux->allow_trickmode_key_units
&& GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (demux)
&& dashstream->active_stream->mimeType == GST_STREAM_VIDEO)
stream->discont = TRUE;
/* Only handle fragment advancing specifically for SIDX if we're not
* in key unit mode */
if (!(dashstream->moof_sync_samples
&& GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (dashdemux))
&& gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)
&& dashstream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) {
/* fragment is advanced on data_received when byte limits are reached */
if (dashstream->pending_seek_ts != GST_CLOCK_TIME_NONE) {
if (SIDX (dashstream)->entry_index < SIDX (dashstream)->entries_count)
return GST_FLOW_OK;
} else if (gst_dash_demux_stream_has_next_subfragment (stream)) {
return GST_FLOW_OK;
}
}
if (G_UNLIKELY (stream->downloading_header || stream->downloading_index))
return GST_FLOW_OK;
return gst_adaptive_demux_stream_advance_fragment (demux, stream,
stream->fragment.duration);
}
static gboolean
gst_dash_demux_need_another_chunk (GstAdaptiveDemuxStream * stream)
{
GstDashDemux *dashdemux = (GstDashDemux *) stream->demux;
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
/* We're chunked downloading for ISOBMFF in KEY_UNITS mode for the actual
* fragment until we parsed the moof and arrived at the mdat. 8192 is a
* random guess for the moof size
*/
if (dashstream->is_isobmff
&& GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (stream->demux)
&& dashstream->active_stream->mimeType == GST_STREAM_VIDEO
&& !stream->downloading_header && !stream->downloading_index
&& dashdemux->allow_trickmode_key_units) {
if (dashstream->isobmff_parser.current_fourcc != GST_ISOFF_FOURCC_MDAT) {
/* Need to download the moof first to know anything */
stream->fragment.chunk_size = 8192;
/* Do we have the first fourcc already or are we in the middle */
if (dashstream->isobmff_parser.current_fourcc == 0) {
stream->fragment.chunk_size += dashstream->moof_average_size;
if (dashstream->first_sync_sample_always_after_moof) {
gboolean first = FALSE;
/* Check if we'll really need that first sample */
if (GST_CLOCK_TIME_IS_VALID (dashstream->target_time)) {
first =
((dashstream->target_time -
dashstream->current_fragment_timestamp) /
dashstream->keyframe_average_distance) == 0 ? TRUE : FALSE;
} else if (stream->segment.rate > 0) {
first = TRUE;
}
if (first)
stream->fragment.chunk_size += dashstream->keyframe_average_size;
}
}
if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client) &&
dashstream->sidx_parser.sidx.entries) {
guint64 sidx_start_offset =
dashstream->sidx_base_offset +
SIDX_CURRENT_ENTRY (dashstream)->offset;
guint64 sidx_end_offset =
sidx_start_offset + SIDX_CURRENT_ENTRY (dashstream)->size;
guint64 downloaded_end_offset;
if (dashstream->current_offset == GST_CLOCK_TIME_NONE) {
downloaded_end_offset = sidx_start_offset;
} else {
downloaded_end_offset =
dashstream->current_offset +
gst_adapter_available (dashstream->adapter);
}
downloaded_end_offset = MAX (downloaded_end_offset, sidx_start_offset);
if (stream->fragment.chunk_size +
downloaded_end_offset > sidx_end_offset) {
stream->fragment.chunk_size = sidx_end_offset - downloaded_end_offset;
}
}
} else if (dashstream->moof && dashstream->moof_sync_samples) {
/* Have the moof, either we're done now or we want to download the
* directly following sync sample */
if (dashstream->first_sync_sample_after_moof
&& dashstream->current_sync_sample == 0) {
GstDashStreamSyncSample *sync_sample =
&g_array_index (dashstream->moof_sync_samples,
GstDashStreamSyncSample, 0);
guint64 end_offset = sync_sample->end_offset + 1;
guint64 downloaded_end_offset;
downloaded_end_offset =
dashstream->current_offset +
gst_adapter_available (dashstream->adapter);
if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client) &&
dashstream->sidx_parser.sidx.entries) {
guint64 sidx_end_offset =
dashstream->sidx_base_offset +
SIDX_CURRENT_ENTRY (dashstream)->offset +
SIDX_CURRENT_ENTRY (dashstream)->size;
if (end_offset > sidx_end_offset) {
end_offset = sidx_end_offset;
}
}
if (downloaded_end_offset < end_offset) {
stream->fragment.chunk_size = end_offset - downloaded_end_offset;
} else {
stream->fragment.chunk_size = 0;
}
} else {
stream->fragment.chunk_size = 0;
}
} else {
/* Have moof but can't do key-units mode, just download until the end */
stream->fragment.chunk_size = -1;
}
} else {
/* We might've decided that we can't allow key-unit only
* trickmodes while doing chunked downloading. In that case
* just download from here to the end now */
if (dashstream->moof
&& GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (stream->demux)) {
stream->fragment.chunk_size = -1;
} else {
stream->fragment.chunk_size = 0;
}
}
return stream->fragment.chunk_size != 0;
}
static GstFlowReturn
gst_dash_demux_parse_isobmff (GstAdaptiveDemux * demux,
GstDashDemuxStream * dash_stream, gboolean * sidx_seek_needed)
{
GstAdaptiveDemuxStream *stream = (GstAdaptiveDemuxStream *) dash_stream;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
gsize available;
GstBuffer *buffer;
GstMapInfo map;
GstByteReader reader;
guint32 fourcc;
guint header_size;
guint64 size, buffer_offset;
*sidx_seek_needed = FALSE;
/* This must not be called when we're in the mdat. We only look at the mdat
* header and then stop parsing the boxes as we're only interested in the
* metadata! Handling mdat is the job of the surrounding code, as well as
* stopping or starting the next fragment when mdat is over (=> sidx)
*/
g_assert (dash_stream->isobmff_parser.current_fourcc !=
GST_ISOFF_FOURCC_MDAT);
available = gst_adapter_available (dash_stream->adapter);
buffer = gst_adapter_take_buffer (dash_stream->adapter, available);
buffer_offset = dash_stream->current_offset;
/* Always at the start of a box here */
g_assert (dash_stream->isobmff_parser.current_size == 0);
/* At the start of a box => Parse it */
gst_buffer_map (buffer, &map, GST_MAP_READ);
gst_byte_reader_init (&reader, map.data, map.size);
/* While there are more boxes left to parse ... */
dash_stream->isobmff_parser.current_start_offset = buffer_offset;
do {
dash_stream->isobmff_parser.current_fourcc = 0;
dash_stream->isobmff_parser.current_size = 0;
if (!gst_isoff_parse_box_header (&reader, &fourcc, NULL, &header_size,
&size)) {
break;
}
dash_stream->isobmff_parser.current_fourcc = fourcc;
if (size == 0) {
/* We assume this is mdat, anything else with "size until end"
* does not seem to make sense */
g_assert (dash_stream->isobmff_parser.current_fourcc ==
GST_ISOFF_FOURCC_MDAT);
dash_stream->isobmff_parser.current_size = -1;
break;
}
dash_stream->isobmff_parser.current_size = size;
/* Do we have the complete box or are at MDAT */
if (gst_byte_reader_get_remaining (&reader) < size - header_size ||
dash_stream->isobmff_parser.current_fourcc == GST_ISOFF_FOURCC_MDAT) {
/* Reset byte reader to the beginning of the box */
gst_byte_reader_set_pos (&reader,
gst_byte_reader_get_pos (&reader) - header_size);
break;
}
GST_LOG_OBJECT (stream->pad,
"box %" GST_FOURCC_FORMAT " at offset %" G_GUINT64_FORMAT " size %"
G_GUINT64_FORMAT, GST_FOURCC_ARGS (fourcc),
dash_stream->isobmff_parser.current_start_offset, size);
if (dash_stream->isobmff_parser.current_fourcc == GST_ISOFF_FOURCC_MOOF) {
GstByteReader sub_reader;
/* Only allow SIDX before the very first moof */
dash_stream->allow_sidx = FALSE;
g_assert (dash_stream->moof == NULL);
g_assert (dash_stream->moof_sync_samples == NULL);
gst_byte_reader_get_sub_reader (&reader, &sub_reader, size - header_size);
dash_stream->moof = gst_isoff_moof_box_parse (&sub_reader);
dash_stream->moof_offset =
dash_stream->isobmff_parser.current_start_offset;
dash_stream->moof_size = size;
dash_stream->current_sync_sample = -1;
if (dash_stream->moof_average_size) {
if (dash_stream->moof_average_size < size)
dash_stream->moof_average_size =
(size * 3 + dash_stream->moof_average_size) / 4;
else
dash_stream->moof_average_size =
(size + dash_stream->moof_average_size + 3) / 4;
} else {
dash_stream->moof_average_size = size;
}
} else if (dash_stream->isobmff_parser.current_fourcc ==
GST_ISOFF_FOURCC_SIDX &&
gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client) &&
dash_stream->allow_sidx) {
GstByteReader sub_reader;
GstIsoffParserResult res;
guint dummy;
dash_stream->sidx_base_offset =
dash_stream->isobmff_parser.current_start_offset + size;
dash_stream->allow_sidx = FALSE;
gst_byte_reader_get_sub_reader (&reader, &sub_reader, size - header_size);
res =
gst_isoff_sidx_parser_parse (&dash_stream->sidx_parser, &sub_reader,
&dummy);
if (res == GST_ISOFF_PARSER_DONE) {
guint64 first_offset = dash_stream->sidx_parser.sidx.first_offset;
GstSidxBox *sidx = SIDX (dash_stream);
guint i;
if (first_offset) {
GST_LOG_OBJECT (stream->pad,
"non-zero sidx first offset %" G_GUINT64_FORMAT, first_offset);
dash_stream->sidx_base_offset += first_offset;
}
for (i = 0; i < sidx->entries_count; i++) {
GstSidxBoxEntry *entry = &sidx->entries[i];
if (entry->ref_type != 0) {
GST_FIXME_OBJECT (stream->pad, "SIDX ref_type 1 not supported yet");
dash_stream->sidx_position = GST_CLOCK_TIME_NONE;
gst_isoff_sidx_parser_clear (&dash_stream->sidx_parser);
break;
}
}
/* We might've cleared the index above */
if (sidx->entries_count > 0) {
if (GST_CLOCK_TIME_IS_VALID (dash_stream->pending_seek_ts)) {
/* FIXME, preserve seek flags */
if (gst_dash_demux_stream_sidx_seek (dash_stream,
demux->segment.rate >= 0, 0, dash_stream->pending_seek_ts,
NULL) != GST_FLOW_OK) {
GST_ERROR_OBJECT (stream->pad, "Couldn't find position in sidx");
dash_stream->sidx_position = GST_CLOCK_TIME_NONE;
gst_isoff_sidx_parser_clear (&dash_stream->sidx_parser);
}
dash_stream->pending_seek_ts = GST_CLOCK_TIME_NONE;
} else {
if (dash_stream->sidx_position == GST_CLOCK_TIME_NONE) {
SIDX (dash_stream)->entry_index = 0;
} else {
if (gst_dash_demux_stream_sidx_seek (dash_stream,
demux->segment.rate >= 0, GST_SEEK_FLAG_SNAP_BEFORE,
dash_stream->sidx_position, NULL) != GST_FLOW_OK) {
GST_ERROR_OBJECT (stream->pad,
"Couldn't find position in sidx");
dash_stream->sidx_position = GST_CLOCK_TIME_NONE;
gst_isoff_sidx_parser_clear (&dash_stream->sidx_parser);
}
}
dash_stream->sidx_position =
SIDX (dash_stream)->entries[SIDX (dash_stream)->entry_index].
pts;
}
}
if (dash_stream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED &&
SIDX (dash_stream)->entry_index != 0) {
/* Need to jump to the requested SIDX entry. Push everything up to
* the SIDX box below and let the caller handle everything else */
*sidx_seek_needed = TRUE;
break;
}
}
} else {
gst_byte_reader_skip (&reader, size - header_size);
}
dash_stream->isobmff_parser.current_fourcc = 0;
dash_stream->isobmff_parser.current_start_offset += size;
dash_stream->isobmff_parser.current_size = 0;
} while (gst_byte_reader_get_remaining (&reader) > 0);
gst_buffer_unmap (buffer, &map);
/* mdat? Push all we have and wait for it to be over */
if (dash_stream->isobmff_parser.current_fourcc == GST_ISOFF_FOURCC_MDAT) {
GstBuffer *pending;
GST_LOG_OBJECT (stream->pad,
"box %" GST_FOURCC_FORMAT " at offset %" G_GUINT64_FORMAT " size %"
G_GUINT64_FORMAT, GST_FOURCC_ARGS (fourcc),
dash_stream->isobmff_parser.current_start_offset,
dash_stream->isobmff_parser.current_size);
/* At mdat. Move the start of the mdat to the adapter and have everything
* else be pushed. We parsed all header boxes at this point and are not
* supposed to be called again until the next moof */
pending = _gst_buffer_split (buffer, gst_byte_reader_get_pos (&reader), -1);
gst_adapter_push (dash_stream->adapter, pending);
dash_stream->current_offset += gst_byte_reader_get_pos (&reader);
dash_stream->isobmff_parser.current_size = 0;
GST_BUFFER_OFFSET (buffer) = buffer_offset;
GST_BUFFER_OFFSET_END (buffer) =
buffer_offset + gst_buffer_get_size (buffer);
return gst_adaptive_demux_stream_push_buffer (stream, buffer);
} else if (gst_byte_reader_get_pos (&reader) != 0) {
GstBuffer *pending;
/* Multiple complete boxes and no mdat? Push them and keep the remainder,
* which is the start of the next box if any remainder */
pending = _gst_buffer_split (buffer, gst_byte_reader_get_pos (&reader), -1);
gst_adapter_push (dash_stream->adapter, pending);
dash_stream->current_offset += gst_byte_reader_get_pos (&reader);
dash_stream->isobmff_parser.current_size = 0;
GST_BUFFER_OFFSET (buffer) = buffer_offset;
GST_BUFFER_OFFSET_END (buffer) =
buffer_offset + gst_buffer_get_size (buffer);
return gst_adaptive_demux_stream_push_buffer (stream, buffer);
}
/* Not even a single complete, non-mdat box, wait */
dash_stream->isobmff_parser.current_size = 0;
gst_adapter_push (dash_stream->adapter, buffer);
return GST_FLOW_OK;
}
static gboolean
gst_dash_demux_find_sync_samples (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream)
{
GstDashDemux *dashdemux = (GstDashDemux *) stream->demux;
GstDashDemuxStream *dash_stream = (GstDashDemuxStream *) stream;
guint i;
guint32 track_id = 0;
guint64 prev_traf_end;
gboolean trex_sample_flags = FALSE;
if (!dash_stream->moof) {
dashdemux->allow_trickmode_key_units = FALSE;
return FALSE;
}
dash_stream->current_sync_sample = -1;
dash_stream->moof_sync_samples =
g_array_new (FALSE, FALSE, sizeof (GstDashStreamSyncSample));
prev_traf_end = dash_stream->moof_offset;
/* generate table of keyframes and offsets */
for (i = 0; i < dash_stream->moof->traf->len; i++) {
GstTrafBox *traf = &g_array_index (dash_stream->moof->traf, GstTrafBox, i);
guint64 traf_offset = 0, prev_trun_end;
guint j;
if (i == 0) {
track_id = traf->tfhd.track_id;
} else if (track_id != traf->tfhd.track_id) {
GST_ERROR_OBJECT (stream->pad,
"moof with trafs of different track ids (%u != %u)", track_id,
traf->tfhd.track_id);
g_array_free (dash_stream->moof_sync_samples, TRUE);
dash_stream->moof_sync_samples = NULL;
dashdemux->allow_trickmode_key_units = FALSE;
return FALSE;
}
if (traf->tfhd.flags & GST_TFHD_FLAGS_BASE_DATA_OFFSET_PRESENT) {
traf_offset = traf->tfhd.base_data_offset;
} else if (traf->tfhd.flags & GST_TFHD_FLAGS_DEFAULT_BASE_IS_MOOF) {
traf_offset = dash_stream->moof_offset;
} else {
traf_offset = prev_traf_end;
}
prev_trun_end = traf_offset;
for (j = 0; j < traf->trun->len; j++) {
GstTrunBox *trun = &g_array_index (traf->trun, GstTrunBox, j);
guint64 trun_offset, prev_sample_end;
guint k;
if (trun->flags & GST_TRUN_FLAGS_DATA_OFFSET_PRESENT) {
trun_offset = traf_offset + trun->data_offset;
} else {
trun_offset = prev_trun_end;
}
prev_sample_end = trun_offset;
for (k = 0; k < trun->samples->len; k++) {
GstTrunSample *sample =
&g_array_index (trun->samples, GstTrunSample, k);
guint64 sample_offset;
guint32 sample_flags;
#if 0
guint32 sample_duration;
#endif
sample_offset = prev_sample_end;
if (trun->flags & GST_TRUN_FLAGS_SAMPLE_FLAGS_PRESENT) {
sample_flags = sample->sample_flags;
} else if ((trun->flags & GST_TRUN_FLAGS_FIRST_SAMPLE_FLAGS_PRESENT)
&& k == 0) {
sample_flags = trun->first_sample_flags;
} else if (traf->tfhd.
flags & GST_TFHD_FLAGS_DEFAULT_SAMPLE_FLAGS_PRESENT) {
sample_flags = traf->tfhd.default_sample_flags;
} else {
trex_sample_flags = TRUE;
continue;
}
#if 0
if (trun->flags & GST_TRUN_FLAGS_SAMPLE_DURATION_PRESENT) {
sample_duration = sample->sample_duration;
} else if (traf->tfhd.
flags & GST_TFHD_FLAGS_DEFAULT_SAMPLE_DURATION_PRESENT) {
sample_duration = traf->tfhd.default_sample_duration;
} else {
GST_FIXME_OBJECT (stream->pad,
"Sample duration given by trex - can't download only keyframes");
g_array_free (dash_stream->moof_sync_samples, TRUE);
dash_stream->moof_sync_samples = NULL;
return FALSE;
}
#endif
if (trun->flags & GST_TRUN_FLAGS_SAMPLE_SIZE_PRESENT) {
prev_sample_end += sample->sample_size;
} else if (traf->tfhd.
flags & GST_TFHD_FLAGS_DEFAULT_SAMPLE_SIZE_PRESENT) {
prev_sample_end += traf->tfhd.default_sample_size;
} else {
GST_FIXME_OBJECT (stream->pad,
"Sample size given by trex - can't download only keyframes");
g_array_free (dash_stream->moof_sync_samples, TRUE);
dash_stream->moof_sync_samples = NULL;
dashdemux->allow_trickmode_key_units = FALSE;
return FALSE;
}
/* Non-non-sync sample aka sync sample */
if (!GST_ISOFF_SAMPLE_FLAGS_SAMPLE_IS_NON_SYNC_SAMPLE (sample_flags) ||
GST_ISOFF_SAMPLE_FLAGS_SAMPLE_DEPENDS_ON (sample_flags) == 2) {
GstDashStreamSyncSample sync_sample =
{ sample_offset, prev_sample_end - 1 };
/* TODO: need timestamps so we can decide to download or not */
g_array_append_val (dash_stream->moof_sync_samples, sync_sample);
}
}
prev_trun_end = prev_sample_end;
}
prev_traf_end = prev_trun_end;
}
if (trex_sample_flags) {
if (dash_stream->moof_sync_samples->len > 0) {
GST_LOG_OBJECT (stream->pad,
"Some sample flags given by trex but still found sync samples");
} else {
GST_FIXME_OBJECT (stream->pad,
"Sample flags given by trex - can't download only keyframes");
g_array_free (dash_stream->moof_sync_samples, TRUE);
dash_stream->moof_sync_samples = NULL;
dashdemux->allow_trickmode_key_units = FALSE;
return FALSE;
}
}
if (dash_stream->moof_sync_samples->len == 0) {
GST_LOG_OBJECT (stream->pad, "No sync samples found in fragment");
g_array_free (dash_stream->moof_sync_samples, TRUE);
dash_stream->moof_sync_samples = NULL;
dashdemux->allow_trickmode_key_units = FALSE;
return FALSE;
}
{
GstDashStreamSyncSample *sync_sample;
guint i;
guint size;
GstClockTime current_keyframe_distance;
for (i = 0; i < dash_stream->moof_sync_samples->len; i++) {
sync_sample =
&g_array_index (dash_stream->moof_sync_samples,
GstDashStreamSyncSample, i);
size = sync_sample->end_offset + 1 - sync_sample->start_offset;
if (dash_stream->keyframe_average_size) {
/* Over-estimate the keyframe size */
if (dash_stream->keyframe_average_size < size)
dash_stream->keyframe_average_size =
(size * 3 + dash_stream->keyframe_average_size) / 4;
else
dash_stream->keyframe_average_size =
(size + dash_stream->keyframe_average_size * 3) / 4;
} else {
dash_stream->keyframe_average_size = size;
}
if (i == 0) {
if (dash_stream->moof_offset + dash_stream->moof_size + 8 <
sync_sample->start_offset) {
dash_stream->first_sync_sample_after_moof = FALSE;
dash_stream->first_sync_sample_always_after_moof = FALSE;
} else {
dash_stream->first_sync_sample_after_moof =
(dash_stream->moof_sync_samples->len == 1
|| demux->segment.rate > 0.0);
}
}
}
g_assert (stream->fragment.duration != 0);
g_assert (stream->fragment.duration != GST_CLOCK_TIME_NONE);
if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)
&& dash_stream->sidx_position != GST_CLOCK_TIME_NONE
&& SIDX (dash_stream)->entries) {
GstSidxBoxEntry *entry = SIDX_CURRENT_ENTRY (dash_stream);
current_keyframe_distance =
entry->duration / dash_stream->moof_sync_samples->len;
} else {
current_keyframe_distance =
stream->fragment.duration / dash_stream->moof_sync_samples->len;
}
dash_stream->current_fragment_keyframe_distance = current_keyframe_distance;
if (dash_stream->keyframe_average_distance) {
/* Under-estimate the keyframe distance */
if (dash_stream->keyframe_average_distance > current_keyframe_distance)
dash_stream->keyframe_average_distance =
(dash_stream->keyframe_average_distance * 3 +
current_keyframe_distance) / 4;
else
dash_stream->keyframe_average_distance =
(dash_stream->keyframe_average_distance +
current_keyframe_distance * 3) / 4;
} else {
dash_stream->keyframe_average_distance = current_keyframe_distance;
}
GST_DEBUG_OBJECT (stream->pad,
"average keyframe sample size: %" G_GUINT64_FORMAT,
dash_stream->keyframe_average_size);
GST_DEBUG_OBJECT (stream->pad,
"average keyframe distance: %" GST_TIME_FORMAT " (%" GST_TIME_FORMAT
")", GST_TIME_ARGS (dash_stream->keyframe_average_distance),
GST_TIME_ARGS (current_keyframe_distance));
GST_DEBUG_OBJECT (stream->pad, "first sync sample after moof: %d",
dash_stream->first_sync_sample_after_moof);
}
return TRUE;
}
static GstFlowReturn
gst_dash_demux_handle_isobmff (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dash_stream = (GstDashDemuxStream *) stream;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buffer;
gboolean sidx_advance = FALSE;
/* We parse all ISOBMFF boxes of a (sub)fragment until the mdat. This covers
* at least moov, moof and sidx boxes. Once mdat is received we just output
* everything until the next (sub)fragment */
if (dash_stream->isobmff_parser.current_fourcc != GST_ISOFF_FOURCC_MDAT) {
gboolean sidx_seek_needed = FALSE;
ret = gst_dash_demux_parse_isobmff (demux, dash_stream, &sidx_seek_needed);
if (ret != GST_FLOW_OK)
return ret;
/* Go to selected segment if needed here */
if (sidx_seek_needed && !stream->downloading_index)
return GST_ADAPTIVE_DEMUX_FLOW_END_OF_FRAGMENT;
/* No mdat yet, let's get called again with the next boxes */
if (dash_stream->isobmff_parser.current_fourcc != GST_ISOFF_FOURCC_MDAT)
return ret;
/* Here we end up only if we're right at the mdat start */
/* Jump to the next sync sample. As we're doing chunked downloading
* here, just drop data until our chunk is over so we can reuse the
* HTTP connection instead of having to create a new one or
* reuse the data if the sync sample follows the moof */
if (dash_stream->active_stream->mimeType == GST_STREAM_VIDEO
&& gst_dash_demux_find_sync_samples (demux, stream) &&
GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (stream->demux)) {
guint idx = -1;
if (GST_CLOCK_TIME_IS_VALID (dash_stream->target_time)) {
idx =
(dash_stream->target_time -
dash_stream->current_fragment_timestamp) /
dash_stream->current_fragment_keyframe_distance;
} else if (stream->segment.rate > 0) {
idx = 0;
}
GST_DEBUG_OBJECT (stream->pad, "target %" GST_TIME_FORMAT " idx %d",
GST_TIME_ARGS (dash_stream->target_time), idx);
/* Figure out target time */
if (dash_stream->first_sync_sample_after_moof && idx == 0) {
/* If we're here, don't throw away data but collect sync
* sample while we're at it below. We're doing chunked
* downloading so might need to adjust the next chunk size for
* the remainder */
dash_stream->current_sync_sample = 0;
GST_DEBUG_OBJECT (stream->pad, "Using first keyframe after header");
}
}
if (gst_adapter_available (dash_stream->adapter) == 0)
return ret;
/* We have some data from the mdat available in the adapter, handle it
* below in the push code */
} else {
/* Somewhere in the middle of the mdat */
}
/* At mdat */
if (dash_stream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) {
guint64 sidx_end_offset =
dash_stream->sidx_base_offset +
SIDX_CURRENT_ENTRY (dash_stream)->offset +
SIDX_CURRENT_ENTRY (dash_stream)->size;
gboolean has_next = gst_dash_demux_stream_has_next_subfragment (stream);
gsize available;
/* Need to handle everything in the adapter according to the parsed SIDX
* and advance subsegments accordingly */
available = gst_adapter_available (dash_stream->adapter);
if (dash_stream->current_offset + available < sidx_end_offset) {
buffer = gst_adapter_take_buffer (dash_stream->adapter, available);
} else {
if (!has_next && sidx_end_offset <= dash_stream->current_offset) {
/* Drain all bytes, since there might be trailing bytes at the end of subfragment */
buffer = gst_adapter_take_buffer (dash_stream->adapter, available);
} else {
if (sidx_end_offset <= dash_stream->current_offset) {
/* This means a corrupted stream or a bug: ignoring bugs, it
* should only happen if the SIDX index is corrupt */
GST_ERROR_OBJECT (stream->pad, "Invalid SIDX state");
gst_adapter_clear (dash_stream->adapter);
return GST_FLOW_ERROR;
} else {
buffer =
gst_adapter_take_buffer (dash_stream->adapter,
sidx_end_offset - dash_stream->current_offset);
sidx_advance = TRUE;
}
}
}
} else {
/* Take it all and handle it further below */
buffer =
gst_adapter_take_buffer (dash_stream->adapter,
gst_adapter_available (dash_stream->adapter));
/* Attention: All code paths below need to update dash_stream->current_offset */
}
/* We're actually running in key-units trick mode */
if (dash_stream->active_stream->mimeType == GST_STREAM_VIDEO
&& dash_stream->moof_sync_samples
&& GST_ADAPTIVE_DEMUX_IN_TRICKMODE_KEY_UNITS (stream->demux)) {
if (dash_stream->current_sync_sample == -1) {
/* We're doing chunked downloading and wait for finishing the current
* chunk so we can jump to the first keyframe */
dash_stream->current_offset += gst_buffer_get_size (buffer);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
} else {
GstDashStreamSyncSample *sync_sample =
&g_array_index (dash_stream->moof_sync_samples,
GstDashStreamSyncSample, dash_stream->current_sync_sample);
guint64 end_offset =
dash_stream->current_offset + gst_buffer_get_size (buffer);
/* Make sure to not download too much, this should only happen for
* the very first keyframe if it follows the moof */
if (dash_stream->current_offset >= sync_sample->end_offset + 1) {
dash_stream->current_offset += gst_buffer_get_size (buffer);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
} else if (end_offset > sync_sample->end_offset + 1) {
guint64 remaining =
sync_sample->end_offset + 1 - dash_stream->current_offset;
GstBuffer *sub = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0,
remaining);
gst_buffer_unref (buffer);
buffer = sub;
}
}
}
GST_BUFFER_OFFSET (buffer) = dash_stream->current_offset;
dash_stream->current_offset += gst_buffer_get_size (buffer);
GST_BUFFER_OFFSET_END (buffer) = dash_stream->current_offset;
ret = gst_adaptive_demux_stream_push_buffer (stream, buffer);
if (ret != GST_FLOW_OK)
return ret;
if (sidx_advance) {
ret =
gst_adaptive_demux_stream_advance_fragment (demux, stream,
SIDX_CURRENT_ENTRY (dash_stream)->duration);
if (ret != GST_FLOW_OK)
return ret;
/* If we still have data available, recurse and use it up if possible */
if (gst_adapter_available (dash_stream->adapter) > 0)
return gst_dash_demux_handle_isobmff (demux, stream);
}
return ret;
}
static GstFlowReturn
gst_dash_demux_data_received (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream, GstBuffer * buffer)
{
GstDashDemuxStream *dash_stream = (GstDashDemuxStream *) stream;
GstFlowReturn ret = GST_FLOW_OK;
guint index_header_or_data;
if (stream->downloading_index)
index_header_or_data = 1;
else if (stream->downloading_header)
index_header_or_data = 2;
else
index_header_or_data = 3;
if (dash_stream->current_index_header_or_data != index_header_or_data) {
/* Clear pending data */
if (gst_adapter_available (dash_stream->adapter) != 0)
GST_ERROR_OBJECT (stream->pad,
"Had pending SIDX data after switch between index/header/data");
gst_adapter_clear (dash_stream->adapter);
dash_stream->current_index_header_or_data = index_header_or_data;
dash_stream->current_offset = -1;
}
if (dash_stream->current_offset == -1)
dash_stream->current_offset =
GST_BUFFER_OFFSET_IS_VALID (buffer) ? GST_BUFFER_OFFSET (buffer) : 0;
gst_adapter_push (dash_stream->adapter, buffer);
buffer = NULL;
if (dash_stream->is_isobmff || stream->downloading_index) {
/* SIDX index is also ISOBMMF */
ret = gst_dash_demux_handle_isobmff (demux, stream);
} else if (dash_stream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) {
gsize available;
/* Not ISOBMFF but had a SIDX index. Does this even exist or work? */
while (ret == GST_FLOW_OK
&& ((available = gst_adapter_available (dash_stream->adapter)) > 0)) {
gboolean advance = FALSE;
guint64 sidx_end_offset =
dash_stream->sidx_base_offset +
SIDX_CURRENT_ENTRY (dash_stream)->offset +
SIDX_CURRENT_ENTRY (dash_stream)->size;
gboolean has_next = gst_dash_demux_stream_has_next_subfragment (stream);
if (dash_stream->current_offset + available < sidx_end_offset) {
buffer = gst_adapter_take_buffer (dash_stream->adapter, available);
} else {
if (!has_next && sidx_end_offset <= dash_stream->current_offset) {
/* Drain all bytes, since there might be trailing bytes at the end of subfragment */
buffer = gst_adapter_take_buffer (dash_stream->adapter, available);
} else {
if (sidx_end_offset <= dash_stream->current_offset) {
/* This means a corrupted stream or a bug: ignoring bugs, it
* should only happen if the SIDX index is corrupt */
GST_ERROR_OBJECT (stream->pad, "Invalid SIDX state");
gst_adapter_clear (dash_stream->adapter);
ret = GST_FLOW_ERROR;
break;
} else {
buffer =
gst_adapter_take_buffer (dash_stream->adapter,
sidx_end_offset - dash_stream->current_offset);
advance = TRUE;
}
}
}
GST_BUFFER_OFFSET (buffer) = dash_stream->current_offset;
GST_BUFFER_OFFSET_END (buffer) =
GST_BUFFER_OFFSET (buffer) + gst_buffer_get_size (buffer);
dash_stream->current_offset = GST_BUFFER_OFFSET_END (buffer);
ret = gst_adaptive_demux_stream_push_buffer (stream, buffer);
if (advance) {
if (has_next) {
GstFlowReturn new_ret;
new_ret =
gst_adaptive_demux_stream_advance_fragment (demux, stream,
SIDX_CURRENT_ENTRY (dash_stream)->duration);
/* only overwrite if it was OK before */
if (ret == GST_FLOW_OK)
ret = new_ret;
} else {
break;
}
}
}
} else {
/* this should be the main header, just push it all */
buffer = gst_adapter_take_buffer (dash_stream->adapter,
gst_adapter_available (dash_stream->adapter));
GST_BUFFER_OFFSET (buffer) = dash_stream->current_offset;
GST_BUFFER_OFFSET_END (buffer) =
GST_BUFFER_OFFSET (buffer) + gst_buffer_get_size (buffer);
dash_stream->current_offset = GST_BUFFER_OFFSET_END (buffer);
ret = gst_adaptive_demux_stream_push_buffer (stream, buffer);
}
return ret;
}
static void
gst_dash_demux_stream_free (GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dash_stream = (GstDashDemuxStream *) stream;
gst_isoff_sidx_parser_clear (&dash_stream->sidx_parser);
if (dash_stream->adapter)
g_object_unref (dash_stream->adapter);
if (dash_stream->moof)
gst_isoff_moof_box_free (dash_stream->moof);
if (dash_stream->moof_sync_samples)
g_array_free (dash_stream->moof_sync_samples, TRUE);
}
static GstDashDemuxClockDrift *
gst_dash_demux_clock_drift_new (GstDashDemux * demux)
{
GstDashDemuxClockDrift *clock_drift;
clock_drift = g_slice_new0 (GstDashDemuxClockDrift);
g_mutex_init (&clock_drift->clock_lock);
clock_drift->next_update =
GST_TIME_AS_USECONDS (gst_adaptive_demux_get_monotonic_time
(GST_ADAPTIVE_DEMUX_CAST (demux)));
return clock_drift;
}
static void
gst_dash_demux_clock_drift_free (GstDashDemuxClockDrift * clock_drift)
{
if (clock_drift) {
g_mutex_lock (&clock_drift->clock_lock);
if (clock_drift->ntp_clock)
g_object_unref (clock_drift->ntp_clock);
g_mutex_unlock (&clock_drift->clock_lock);
g_mutex_clear (&clock_drift->clock_lock);
g_slice_free (GstDashDemuxClockDrift, clock_drift);
}
}
/*
* The value attribute of the UTCTiming element contains a white-space
* separated list of servers that are recommended to be used in
* combination with the NTP protocol as defined in IETF RFC 5905 for
* getting the appropriate time.
*
* The DASH standard does not specify which version of NTP. This
* function only works with NTPv4 servers.
*/
static GstDateTime *
gst_dash_demux_poll_ntp_server (GstDashDemuxClockDrift * clock_drift,
gchar ** urls)
{
GstClockTime ntp_clock_time;
GDateTime *dt, *dt2;
if (!clock_drift->ntp_clock) {
GResolver *resolver;
GList *inet_addrs;
GError *err;
gchar *ip_addr;
resolver = g_resolver_get_default ();
/* We don't round-robin NTP servers. If the manifest specifies multiple
NTP time servers, select one at random */
clock_drift->selected_url = g_random_int_range (0, g_strv_length (urls));
GST_DEBUG ("Connecting to NTP time server %s",
urls[clock_drift->selected_url]);
inet_addrs = g_resolver_lookup_by_name (resolver,
urls[clock_drift->selected_url], NULL, &err);
g_object_unref (resolver);
if (!inet_addrs || g_list_length (inet_addrs) == 0) {
GST_ERROR ("Failed to resolve hostname of NTP server: %s",
err ? (err->message) : "unknown error");
if (inet_addrs)
g_resolver_free_addresses (inet_addrs);
if (err)
g_error_free (err);
return NULL;
}
ip_addr =
g_inet_address_to_string ((GInetAddress
*) (g_list_first (inet_addrs)->data));
clock_drift->ntp_clock = gst_ntp_clock_new ("dashntp", ip_addr, 123, 0);
g_free (ip_addr);
g_resolver_free_addresses (inet_addrs);
if (!clock_drift->ntp_clock) {
GST_ERROR ("Failed to create NTP clock");
return NULL;
}
if (!gst_clock_wait_for_sync (clock_drift->ntp_clock, 5 * GST_SECOND)) {
g_object_unref (clock_drift->ntp_clock);
clock_drift->ntp_clock = NULL;
GST_ERROR ("Failed to lock to NTP clock");
return NULL;
}
}
ntp_clock_time = gst_clock_get_time (clock_drift->ntp_clock);
if (ntp_clock_time == GST_CLOCK_TIME_NONE) {
GST_ERROR ("Failed to get time from NTP clock");
return NULL;
}
ntp_clock_time -= NTP_TO_UNIX_EPOCH * GST_SECOND;
dt = g_date_time_new_from_unix_utc (ntp_clock_time / GST_SECOND);
if (!dt) {
GST_ERROR ("Failed to create GstDateTime");
return NULL;
}
ntp_clock_time =
gst_util_uint64_scale (ntp_clock_time % GST_SECOND, 1000000, GST_SECOND);
dt2 = g_date_time_add (dt, ntp_clock_time);
g_date_time_unref (dt);
return gst_date_time_new_from_g_date_time (dt2);
}
struct Rfc5322TimeZone
{
const gchar *name;
gfloat tzoffset;
};
/*
Parse an RFC5322 (section 3.3) date-time from the Date: field in the
HTTP response.
See https://tools.ietf.org/html/rfc5322#section-3.3
*/
static GstDateTime *
gst_dash_demux_parse_http_head (GstDashDemuxClockDrift * clock_drift,
GstFragment * download)
{
static const gchar *months[] = { NULL, "Jan", "Feb", "Mar", "Apr",
"May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec", NULL
};
static const struct Rfc5322TimeZone timezones[] = {
{"Z", 0},
{"UT", 0},
{"GMT", 0},
{"BST", 1},
{"EST", -5},
{"EDT", -4},
{"CST", -6},
{"CDT", -5},
{"MST", -7},
{"MDT", -6},
{"PST", -8},
{"PDT", -7},
{NULL, 0}
};
GstDateTime *value = NULL;
const GstStructure *response_headers;
const gchar *http_date;
const GValue *val;
gint ret;
const gchar *pos;
gint year = -1, month = -1, day = -1, hour = -1, minute = -1, second = -1;
gchar zone[6];
gchar monthstr[4];
gfloat tzoffset = 0;
gboolean parsed_tz = FALSE;
g_return_val_if_fail (download != NULL, NULL);
g_return_val_if_fail (download->headers != NULL, NULL);
val = gst_structure_get_value (download->headers, "response-headers");
if (!val) {
return NULL;
}
response_headers = gst_value_get_structure (val);
http_date = gst_structure_get_string (response_headers, "Date");
if (!http_date) {
return NULL;
}
/* skip optional text version of day of the week */
pos = strchr (http_date, ',');
if (pos)
pos++;
else
pos = http_date;
ret =
sscanf (pos, "%02d %3s %04d %02d:%02d:%02d %5s", &day, monthstr, &year,
&hour, &minute, &second, zone);
if (ret == 7) {
gchar *z = zone;
gint i;
for (i = 1; months[i]; ++i) {
if (g_ascii_strncasecmp (months[i], monthstr, strlen (months[i])) == 0) {
month = i;
break;
}
}
for (i = 0; timezones[i].name && !parsed_tz; ++i) {
if (g_ascii_strncasecmp (timezones[i].name, z,
strlen (timezones[i].name)) == 0) {
tzoffset = timezones[i].tzoffset;
parsed_tz = TRUE;
}
}
if (!parsed_tz) {
gint hh, mm;
gboolean neg = FALSE;
/* check if it is in the form +-HHMM */
if (*z == '+' || *z == '-') {
if (*z == '+')
++z;
else if (*z == '-') {
++z;
neg = TRUE;
}
ret = sscanf (z, "%02d%02d", &hh, &mm);
if (ret == 2) {
tzoffset = hh;
tzoffset += mm / 60.0;
if (neg)
tzoffset = -tzoffset;
parsed_tz = TRUE;
}
}
}
/* Accept year in both 2 digit or 4 digit format */
if (year < 100)
year += 2000;
}
if (month > 0 && parsed_tz) {
value = gst_date_time_new (tzoffset,
year, month, day, hour, minute, second);
}
return value;
}
/*
The timing information is contained in the message body of the HTTP
response and contains a time value formatted according to NTP timestamp
format in IETF RFC 5905.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Seconds |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Fraction |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
NTP Timestamp Format
*/
static GstDateTime *
gst_dash_demux_parse_http_ntp (GstDashDemuxClockDrift * clock_drift,
GstBuffer * buffer)
{
gint64 seconds;
guint64 fraction;
GDateTime *dt, *dt2;
GstMapInfo mapinfo;
/* See https://tools.ietf.org/html/rfc5905#page-12 for details of
the NTP Timestamp Format */
gst_buffer_map (buffer, &mapinfo, GST_MAP_READ);
if (mapinfo.size != 8) {
gst_buffer_unmap (buffer, &mapinfo);
return NULL;
}
seconds = GST_READ_UINT32_BE (mapinfo.data);
fraction = GST_READ_UINT32_BE (mapinfo.data + 4);
gst_buffer_unmap (buffer, &mapinfo);
fraction = gst_util_uint64_scale (fraction, 1000000,
G_GUINT64_CONSTANT (1) << 32);
/* subtract constant to convert from 1900 based time to 1970 based time */
seconds -= NTP_TO_UNIX_EPOCH;
dt = g_date_time_new_from_unix_utc (seconds);
dt2 = g_date_time_add (dt, fraction);
g_date_time_unref (dt);
return gst_date_time_new_from_g_date_time (dt2);
}
/*
The timing information is contained in the message body of the
HTTP response and contains a time value formatted according to
xs:dateTime as defined in W3C XML Schema Part 2: Datatypes specification.
*/
static GstDateTime *
gst_dash_demux_parse_http_xsdate (GstDashDemuxClockDrift * clock_drift,
GstBuffer * buffer)
{
GstDateTime *value = NULL;
GstMapInfo mapinfo;
/* the string from the server might not be zero terminated */
if (gst_buffer_map (buffer, &mapinfo, GST_MAP_READ)) {
gchar *str;
str = g_strndup ((const gchar *) mapinfo.data, mapinfo.size);
gst_buffer_unmap (buffer, &mapinfo);
value = gst_date_time_new_from_iso8601_string (str);
g_free (str);
}
return value;
}
static gboolean
gst_dash_demux_poll_clock_drift (GstDashDemux * demux)
{
GstDashDemuxClockDrift *clock_drift;
GDateTime *start = NULL, *end;
GstBuffer *buffer = NULL;
GstDateTime *value = NULL;
gboolean ret = FALSE;
gint64 now;
GstMPDUTCTimingType method;
gchar **urls;
g_return_val_if_fail (demux != NULL, FALSE);
g_return_val_if_fail (demux->clock_drift != NULL, FALSE);
clock_drift = demux->clock_drift;
now =
GST_TIME_AS_USECONDS (gst_adaptive_demux_get_monotonic_time
(GST_ADAPTIVE_DEMUX_CAST (demux)));
if (now < clock_drift->next_update) {
/*TODO: If a fragment fails to download in adaptivedemux, it waits
for a manifest reload before another attempt to fetch a fragment.
Section 10.8.6 of the DVB-DASH standard states that the DASH client
shall refresh the manifest and resynchronise to one of the time sources.
Currently the fact that the manifest refresh follows a download failure
does not make it into dashdemux. */
return TRUE;
}
urls = gst_mpd_client_get_utc_timing_sources (demux->client,
SUPPORTED_CLOCK_FORMATS, &method);
if (!urls) {
return FALSE;
}
/* Update selected_url just in case the number of URLs in the UTCTiming
element has shrunk since the last poll */
clock_drift->selected_url = clock_drift->selected_url % g_strv_length (urls);
g_mutex_lock (&clock_drift->clock_lock);
if (method == GST_MPD_UTCTIMING_TYPE_NTP) {
value = gst_dash_demux_poll_ntp_server (clock_drift, urls);
if (!value) {
GST_ERROR_OBJECT (demux, "Failed to fetch time from NTP server %s",
urls[clock_drift->selected_url]);
g_mutex_unlock (&clock_drift->clock_lock);
goto quit;
}
}
start =
gst_adaptive_demux_get_client_now_utc (GST_ADAPTIVE_DEMUX_CAST (demux));
if (!value) {
GstFragment *download;
gint64 range_start = 0, range_end = -1;
GST_DEBUG_OBJECT (demux, "Fetching current time from %s",
urls[clock_drift->selected_url]);
if (method == GST_MPD_UTCTIMING_TYPE_HTTP_HEAD) {
range_start = -1;
}
download =
gst_uri_downloader_fetch_uri_with_range (GST_ADAPTIVE_DEMUX_CAST
(demux)->downloader, urls[clock_drift->selected_url], NULL, TRUE, TRUE,
TRUE, range_start, range_end, NULL);
if (download) {
if (method == GST_MPD_UTCTIMING_TYPE_HTTP_HEAD && download->headers) {
value = gst_dash_demux_parse_http_head (clock_drift, download);
} else {
buffer = gst_fragment_get_buffer (download);
}
g_object_unref (download);
}
}
g_mutex_unlock (&clock_drift->clock_lock);
if (!value && !buffer) {
GST_ERROR_OBJECT (demux, "Failed to fetch time from %s",
urls[clock_drift->selected_url]);
goto quit;
}
end = gst_adaptive_demux_get_client_now_utc (GST_ADAPTIVE_DEMUX_CAST (demux));
if (!value && method == GST_MPD_UTCTIMING_TYPE_HTTP_NTP) {
value = gst_dash_demux_parse_http_ntp (clock_drift, buffer);
} else if (!value) {
/* GST_MPD_UTCTIMING_TYPE_HTTP_XSDATE or GST_MPD_UTCTIMING_TYPE_HTTP_ISO */
value = gst_dash_demux_parse_http_xsdate (clock_drift, buffer);
}
if (buffer)
gst_buffer_unref (buffer);
if (value) {
GTimeSpan download_duration = g_date_time_difference (end, start);
GDateTime *client_now, *server_now;
/* We don't know when the server sampled its clock, but we know
it must have been before "end" and probably after "start".
A reasonable estimate is to use (start+end)/2
*/
client_now = g_date_time_add (start, download_duration / 2);
server_now = gst_date_time_to_g_date_time (value);
/* If gst_date_time_new_from_iso8601_string is given an unsupported
ISO 8601 format, it can return a GstDateTime that is not valid,
which causes gst_date_time_to_g_date_time to return NULL */
if (server_now) {
g_mutex_lock (&clock_drift->clock_lock);
clock_drift->clock_compensation =
g_date_time_difference (server_now, client_now);
g_mutex_unlock (&clock_drift->clock_lock);
GST_DEBUG_OBJECT (demux,
"Difference between client and server clocks is %lfs",
((double) clock_drift->clock_compensation) / 1000000.0);
g_date_time_unref (server_now);
ret = TRUE;
} else {
GST_ERROR_OBJECT (demux, "Failed to parse DateTime from server");
}
g_date_time_unref (client_now);
gst_date_time_unref (value);
} else {
GST_ERROR_OBJECT (demux, "Failed to parse DateTime from server");
}
g_date_time_unref (end);
quit:
if (start)
g_date_time_unref (start);
/* if multiple URLs were specified, use a simple round-robin to
poll each server */
g_mutex_lock (&clock_drift->clock_lock);
if (method == GST_MPD_UTCTIMING_TYPE_NTP) {
clock_drift->next_update = now + FAST_CLOCK_UPDATE_INTERVAL;
} else {
clock_drift->selected_url =
(1 + clock_drift->selected_url) % g_strv_length (urls);
if (ret) {
clock_drift->next_update = now + SLOW_CLOCK_UPDATE_INTERVAL;
} else {
clock_drift->next_update = now + FAST_CLOCK_UPDATE_INTERVAL;
}
}
g_mutex_unlock (&clock_drift->clock_lock);
return ret;
}
static GTimeSpan
gst_dash_demux_get_clock_compensation (GstDashDemux * demux)
{
GTimeSpan rv = 0;
if (demux->clock_drift) {
g_mutex_lock (&demux->clock_drift->clock_lock);
rv = demux->clock_drift->clock_compensation;
g_mutex_unlock (&demux->clock_drift->clock_lock);
}
GST_LOG_OBJECT (demux, "Clock drift %" GST_STIME_FORMAT, GST_STIME_ARGS (rv));
return rv;
}
static GDateTime *
gst_dash_demux_get_server_now_utc (GstDashDemux * demux)
{
GDateTime *client_now;
GDateTime *server_now;
client_now =
gst_adaptive_demux_get_client_now_utc (GST_ADAPTIVE_DEMUX_CAST (demux));
server_now =
g_date_time_add (client_now,
gst_dash_demux_get_clock_compensation (demux));
g_date_time_unref (client_now);
return server_now;
}
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