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gstreamer/ext/dash/gstdashdemux.c
Sebastian Dröge ffa63c5933 dashdemux: Fix snap SIDX seeking and report if we're going outside the index 
Instead of just going to the first or last fragment, report if we're
going outside the index. This should never happen unless there's a bug
or the stream is broken.

Allow some possibility for inaccuracies here though.
2017-03-21 20:38:09 +02:00

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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
*
* DASH demuxer element.
* <title>Example launch line</title>
* |[
* 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 enveloppe 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.
*
*/
#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 NULL /* zero */
/* 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_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_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_node->timeShiftBufferDepth == GST_MPD_DURATION_NONE) {
*start = 0;
} else {
*start =
*stop - (self->client->mpd_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_parser_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_parser_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 = 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)) {
GstAdaptationSetNode *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_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_mpdparser_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_mpdparser_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) {
GstAdaptationSetNode *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) {
GstContentComponentNode *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->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;
if (stream->is_isobmff)
stream->isobmff_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->last_representation_id = NULL;
if (active_stream->cur_adapt_set &&
active_stream->cur_adapt_set->RepresentationBase &&
active_stream->cur_adapt_set->RepresentationBase->ContentProtection) {
GST_DEBUG_OBJECT (demux, "Adding ContentProtection events to source pad");
g_list_foreach (active_stream->cur_adapt_set->RepresentationBase->
ContentProtection, gst_dash_demux_send_content_protection_event,
stream);
}
gst_isoff_sidx_parser_init (&stream->sidx_parser);
if (gst_mpd_client_has_isoff_ondemand_profile (demux->client))
stream->sidx_adapter = gst_adapter_new ();
}
return TRUE;
}
static void
gst_dash_demux_send_content_protection_event (gpointer data, gpointer userdata)
{
GstDescriptorType *cp = (GstDescriptorType *) 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_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_node->suggestedPresentationDelay != -1) {
GstDateTime *target = gst_mpd_client_add_time_difference (now,
dashdemux->client->mpd_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_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 dont need to swich 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 dont need to swich 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_mpdparser_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_mpdparser_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;
if (GST_ADAPTIVE_DEMUX_STREAM_NEED_HEADER (stream) && isombff) {
gst_dash_demux_stream_update_headers_info (stream);
dashstream->sidx_base_offset = stream->fragment.index_range_end + 1;
/* sidx entries may not be available in here */
if (dashstream->sidx_position != 0
&& dashstream->sidx_position != GST_CLOCK_TIME_NONE
&& SIDX (dashstream)->entries) {
/* 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 (dashdemux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) {
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);
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;
return GST_FLOW_OK;
}
if (gst_mpd_client_get_next_fragment_timestamp (dashdemux->client,
dashstream->index, &ts)) {
if (gst_mpd_client_is_live (dashdemux->client)) {
if (!GST_ADAPTIVE_DEMUX_STREAM_NEED_HEADER (stream)) {
if (dashstream->active_stream
&& dashstream->active_stream->cur_representation) {
/* id specifies an identifier for this Representation. The
* identifier shall be unique within a Period unless the
* Representation is functionally identically to another
* Representation in the same Period. */
if (!g_strcmp0 (dashstream->active_stream->cur_representation->id,
dashstream->last_representation_id)) {
GstCaps *caps;
stream->need_header = TRUE;
GST_INFO_OBJECT (dashdemux, "Switching bitrate to %d",
dashstream->active_stream->cur_representation->bandwidth);
caps =
gst_dash_demux_get_input_caps (dashdemux,
dashstream->active_stream);
gst_adaptive_demux_stream_set_caps (stream, caps);
}
}
}
g_free (dashstream->last_representation_id);
if (dashstream->active_stream
&& dashstream->active_stream->cur_representation) {
dashstream->last_representation_id =
g_strdup (dashstream->active_stream->cur_representation->id);
} else {
dashstream->last_representation_id = NULL;
}
}
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 != 0
&& 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;
stream->fragment.timestamp = entry->pts;
stream->fragment.duration = entry->duration;
if (stream->demux->segment.rate < 0.0) {
stream->fragment.range_end =
stream->fragment.range_start + entry->size - 1;
} else {
stream->fragment.range_end = fragment.range_end;
}
} else {
stream->fragment.timestamp = fragment.timestamp;
stream->fragment.duration = fragment.duration;
stream->fragment.range_start =
MAX (fragment.range_start, dashstream->sidx_base_offset);
stream->fragment.range_end = fragment.range_end;
}
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 */
/* 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
&& ABS (sidx->entries[idx + 1].pts - ts) <
ABS (sidx->entries[idx].pts - ts))
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;
last_index = dashstream->active_stream->segment_index;
last_repeat = dashstream->active_stream->segment_repeat_index;
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;
gst_mpd_client_stream_seek (dashdemux->client, dashstream->active_stream,
forward, flags, ts, final_ts);
if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)) {
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);
gst_isoff_sidx_parser_init (&dashstream->sidx_parser);
dashstream->sidx_base_offset = 0;
dashstream->sidx_position = GST_CLOCK_TIME_NONE;
if (dashstream->sidx_adapter)
gst_adapter_clear (dashstream->sidx_adapter);
}
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;
}
}
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 (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) {
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)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
gboolean fragment_finished = FALSE;
if (dashstream->moof_sync_samples
&& GST_ADAPTIVE_DEMUX (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) {
if (stream->demux->segment.rate > 0.0) {
dashstream->current_sync_sample++;
if (dashstream->current_sync_sample >= dashstream->moof_sync_samples->len) {
fragment_finished = TRUE;
}
} 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--;
}
}
}
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 (dashdemux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) {
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);
}
static void
gst_dash_demux_clear_pending_stream_data (GstDashDemux * dashdemux,
GstDashDemuxStream * dashstream)
{
gst_isoff_sidx_parser_clear (&dashstream->sidx_parser);
gst_isoff_sidx_parser_init (&dashstream->sidx_parser);
if (dashstream->sidx_adapter)
gst_adapter_clear (dashstream->sidx_adapter);
dashstream->sidx_base_offset = 0;
dashstream->sidx_position = GST_CLOCK_TIME_NONE;
/* Reset ISOBMFF box parsing state */
if (dashstream->isobmff_adapter)
gst_adapter_clear (dashstream->isobmff_adapter);
dashstream->isobmff_parser.current_fourcc = 0;
dashstream->isobmff_parser.current_start_offset = 0;
dashstream->isobmff_parser.current_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;
}
static GstFlowReturn
gst_dash_demux_stream_advance_fragment (GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux);
GST_DEBUG_OBJECT (stream->pad, "Advance fragment");
/* If downloading only keyframes, switch to the next one or fall through */
if (dashstream->moof_sync_samples
&& GST_ADAPTIVE_DEMUX (dashdemux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) {
if (gst_dash_demux_stream_advance_sync_sample (stream))
return GST_FLOW_OK;
}
if (dashstream->isobmff_adapter)
gst_adapter_clear (dashstream->isobmff_adapter);
dashstream->isobmff_parser.current_fourcc = 0;
dashstream->isobmff_parser.current_start_offset = 0;
dashstream->isobmff_parser.current_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;
if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)) {
if (gst_dash_demux_stream_advance_subfragment (stream))
return GST_FLOW_OK;
}
gst_isoff_sidx_parser_clear (&dashstream->sidx_parser);
gst_isoff_sidx_parser_init (&dashstream->sidx_parser);
dashstream->sidx_base_offset = 0;
dashstream->sidx_position = GST_CLOCK_TIME_NONE;
if (dashstream->sidx_adapter)
gst_adapter_clear (dashstream->sidx_adapter);
return gst_mpd_client_advance_segment (dashdemux->client,
dashstream->active_stream, stream->demux->segment.rate > 0.0);
}
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;
}
/* 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 ((base_demux->segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) ||
ABS (base_demux->segment.rate) <= 1.0) {
new_index =
gst_mpdparser_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_mpdparser_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_mpdparser_get_rep_idx_with_min_bandwidth (rep_list);
if (new_index != active_stream->representation_idx) {
GstRepresentationNode *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_dash_demux_clear_pending_stream_data (demux, dashstream);
}
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_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_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)) {
GstDashDemuxStream *dashstream = iter->data;
if (flags & GST_SEEK_FLAG_FLUSH) {
gst_dash_demux_clear_pending_stream_data (dashdemux, dashstream);
}
gst_dash_demux_stream_seek (iter->data, rate >= 0, 0, target_pos, NULL);
}
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_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_parse (new_client, (gchar *) mapinfo.data, mapinfo.size)) {
const gchar *period_id;
guint period_idx;
GList *iter;
GList *streams_iter;
/* 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;
}
/* update the streams to play from the next segment */
for (iter = demux->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.
*/
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);
g_return_if_fail (gst_mpd_client_has_next_period (dashdemux->client));
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;
dashstream->sidx_index_header_or_data = 0;
dashstream->sidx_current_offset = -1;
dashstream->isobmff_parser.index_header_or_data = 0;
dashstream->isobmff_parser.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
&& (demux->segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS)
&& 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
&& (demux->segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS)
&& 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 (dashdemux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS)
&& 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 (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS)
&& 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)
stream->fragment.chunk_size +=
dashstream->first_sync_sample_average_size;
}
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 (stream->fragment.chunk_size +
dashstream->isobmff_parser.current_offset > sidx_end_offset) {
stream->fragment.chunk_size =
sidx_end_offset - dashstream->isobmff_parser.current_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;
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 (dashstream->isobmff_parser.current_offset < end_offset) {
stream->fragment.chunk_size =
end_offset - dashstream->isobmff_parser.current_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 (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS))
stream->fragment.chunk_size = -1;
else
stream->fragment.chunk_size = 0;
}
return stream->fragment.chunk_size != 0;
}
static GstBuffer *
gst_dash_demux_parse_isobmff (GstAdaptiveDemux * demux,
GstDashDemuxStream * dash_stream, GstBuffer * buffer)
{
GstAdaptiveDemuxStream *stream = (GstAdaptiveDemuxStream *) dash_stream;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
gsize available;
guint index_header_or_data;
GstMapInfo map;
GstByteReader reader;
guint32 fourcc;
guint header_size;
guint64 size, buffer_offset;
/* 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);
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->isobmff_parser.index_header_or_data != index_header_or_data) {
/* Clear pending data */
if (gst_adapter_available (dash_stream->isobmff_adapter) != 0)
GST_ERROR_OBJECT (stream->pad,
"Had pending ISOBMFF data after switch between index/header/data");
gst_adapter_clear (dash_stream->isobmff_adapter);
dash_stream->isobmff_parser.current_fourcc = 0;
dash_stream->isobmff_parser.current_start_offset = 0;
dash_stream->isobmff_parser.current_offset = -1;
dash_stream->isobmff_parser.current_size = 0;
dash_stream->isobmff_parser.index_header_or_data = index_header_or_data;
}
if (dash_stream->isobmff_parser.current_offset == -1) {
dash_stream->isobmff_parser.current_offset =
GST_BUFFER_OFFSET_IS_VALID (buffer) ? GST_BUFFER_OFFSET (buffer) : 0;
}
gst_adapter_push (dash_stream->isobmff_adapter, buffer);
available = gst_adapter_available (dash_stream->isobmff_adapter);
buffer = gst_adapter_take_buffer (dash_stream->isobmff_adapter, available);
buffer_offset = dash_stream->isobmff_parser.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 =
dash_stream->isobmff_parser.current_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_offset +
gst_byte_reader_get_pos (&reader) - header_size, size);
if (dash_stream->isobmff_parser.current_fourcc == GST_ISOFF_FOURCC_MOOF) {
GstByteReader sub_reader;
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)) {
GstByteReader sub_reader;
GstIsoffParserResult res;
guint dummy;
dash_stream->sidx_base_offset = buffer_offset +
gst_byte_reader_get_pos (&reader) - header_size + size;
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;
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;
}
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);
}
/* push buffer up to sidx box, and do pending stream seek */
break;
} else {
gint idx = 0;
if (dash_stream->sidx_position == GST_CLOCK_TIME_NONE) {
idx = 0;
} else {
gint i;
/* Set sidx index to the highest entry that is smaller than our
* remembered position */
for (i = 0; i < SIDX (dash_stream)->entries_count; i++) {
idx = i;
if (SIDX_ENTRY (dash_stream, i)->pts + SIDX_ENTRY (dash_stream,
i)->duration > dash_stream->sidx_position)
break;
}
}
SIDX (dash_stream)->entry_index = idx;
}
}
} 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_offset +
gst_byte_reader_get_pos (&reader) - header_size,
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->isobmff_adapter, pending);
dash_stream->isobmff_parser.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 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->isobmff_adapter, pending);
dash_stream->isobmff_parser.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 buffer;
}
/* Not even a single complete, non-mdat box, wait */
dash_stream->isobmff_parser.current_size = 0;
gst_adapter_push (dash_stream->isobmff_adapter, buffer);
return NULL;
}
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 =
&g_array_index (dash_stream->moof_sync_samples, GstDashStreamSyncSample,
0);
guint size = sync_sample->end_offset + 1 - sync_sample->start_offset;
if (dash_stream->first_sync_sample_average_size) {
if (dash_stream->first_sync_sample_average_size < size)
dash_stream->first_sync_sample_average_size =
(size * 3 + dash_stream->first_sync_sample_average_size) / 4;
else
dash_stream->first_sync_sample_average_size =
(size + dash_stream->first_sync_sample_average_size * 3) / 4;
} else {
dash_stream->first_sync_sample_average_size = size;
}
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);
}
}
return TRUE;
}
static GstFlowReturn
gst_dash_demux_handle_isobmff_buffer (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream, GstBuffer * buffer)
{
GstDashDemuxStream *dash_stream = (GstDashDemuxStream *) stream;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
GstFlowReturn ret = GST_FLOW_OK;
/* Parsing isobmff
* - TRICKMODE_KEY_UNITS can be supported and it's video stream
* - Or, it's On-Demand profile but index_uri for this stream (whatever video/audio)
* is not available, and sidx box was not parsed yet */
if ((dashdemux->allow_trickmode_key_units &&
dash_stream->active_stream->mimeType == GST_STREAM_VIDEO) ||
(gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client) &&
dash_stream->sidx_parser.status != GST_ISOFF_SIDX_PARSER_FINISHED)) {
if (dash_stream->isobmff_parser.current_fourcc != GST_ISOFF_FOURCC_MDAT) {
buffer = gst_dash_demux_parse_isobmff (demux, dash_stream, buffer);
if (buffer
&& (ret =
gst_adaptive_demux_stream_push_buffer (stream,
buffer)) != GST_FLOW_OK)
return ret;
/* Parser found sidx box now */
if (dash_stream->pending_seek_ts != GST_CLOCK_TIME_NONE &&
dash_stream->isobmff_parser.current_fourcc == GST_ISOFF_FOURCC_SIDX &&
dash_stream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED &&
gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)) {
GST_DEBUG_OBJECT (stream->pad,
"Found sidx box, return custom-success to do seeking now");
/* Clear isobmff parser */
gst_adapter_clear (dash_stream->isobmff_adapter);
dash_stream->isobmff_parser.current_fourcc = 0;
dash_stream->isobmff_parser.current_start_offset = 0;
dash_stream->isobmff_parser.current_offset = -1;
dash_stream->isobmff_parser.current_size = 0;
return GST_ADAPTIVE_DEMUX_FLOW_END_OF_FRAGMENT;
}
if (dash_stream->isobmff_parser.current_fourcc != GST_ISOFF_FOURCC_MDAT)
return ret;
/* 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 (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) {
if (dash_stream->first_sync_sample_after_moof) {
/* 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;
} else {
gst_adapter_clear (dash_stream->isobmff_adapter);
}
}
if (gst_adapter_available (dash_stream->isobmff_adapter) == 0)
return ret;
/* We have some data from the mdat available in the adapter, handle it
* below in the push code */
buffer =
gst_adapter_take_buffer (dash_stream->isobmff_adapter,
gst_adapter_available (dash_stream->isobmff_adapter));
} else {
if (dash_stream->isobmff_parser.current_offset == -1) {
dash_stream->isobmff_parser.current_offset =
GST_BUFFER_OFFSET_IS_VALID (buffer) ? GST_BUFFER_OFFSET (buffer) :
0;
}
}
/* At mdat and isobmff and trick modes are allowed */
/* 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 (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) {
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 */
gst_buffer_unref (buffer);
return GST_FLOW_OK;
} else if (dash_stream->first_sync_sample_after_moof
&& dash_stream->current_sync_sample == 0) {
GstDashStreamSyncSample *sync_sample =
&g_array_index (dash_stream->moof_sync_samples,
GstDashStreamSyncSample, 0);
guint64 end_offset =
dash_stream->isobmff_parser.current_offset +
gst_buffer_get_size (buffer);
/* If the first keyframe follows directly the moof and we're
* downloading it here, make sure to not download too much */
if (end_offset > sync_sample->end_offset + 1) {
guint64 remaining =
sync_sample->end_offset + 1 -
dash_stream->isobmff_parser.current_offset;
if (remaining) {
GstBuffer *sub =
gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0,
remaining);
gst_buffer_unref (buffer);
buffer = sub;
} else {
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
}
}
}
GST_BUFFER_OFFSET (buffer) = dash_stream->isobmff_parser.current_offset;
dash_stream->isobmff_parser.current_offset += gst_buffer_get_size (buffer);
GST_BUFFER_OFFSET_END (buffer) = dash_stream->isobmff_parser.current_offset;
} else if (gst_adapter_available (dash_stream->isobmff_adapter) > 0) {
guint64 offset;
/* Drain adapter */
gst_adapter_push (dash_stream->isobmff_adapter, buffer);
buffer =
gst_adapter_take_buffer (dash_stream->isobmff_adapter,
gst_adapter_available (dash_stream->isobmff_adapter));
/* Set buffer offset based on the last parser's offset */
offset = dash_stream->isobmff_parser.current_offset;
GST_BUFFER_OFFSET (buffer) = offset;
GST_BUFFER_OFFSET_END (buffer) = offset + gst_buffer_get_size (buffer);
}
return gst_adaptive_demux_stream_push_buffer (stream, buffer);
}
static GstFlowReturn
gst_dash_demux_data_received (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream, GstBuffer * buffer)
{
GstDashDemuxStream *dash_stream = (GstDashDemuxStream *) stream;
GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux);
GstFlowReturn ret = GST_FLOW_OK;
guint index_header_or_data;
if (!gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)) {
if (dash_stream->is_isobmff)
return gst_dash_demux_handle_isobmff_buffer (demux, stream, buffer);
else
return gst_adaptive_demux_stream_push_buffer (stream, buffer);
}
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->sidx_index_header_or_data != index_header_or_data) {
/* Clear pending data */
if (gst_adapter_available (dash_stream->sidx_adapter) != 0)
GST_ERROR_OBJECT (stream->pad,
"Had pending SIDX data after switch between index/header/data");
gst_adapter_clear (dash_stream->sidx_adapter);
dash_stream->sidx_index_header_or_data = index_header_or_data;
dash_stream->sidx_current_offset = -1;
}
if (dash_stream->sidx_current_offset == -1)
dash_stream->sidx_current_offset =
GST_BUFFER_OFFSET_IS_VALID (buffer) ? GST_BUFFER_OFFSET (buffer) : 0;
gst_adapter_push (dash_stream->sidx_adapter, buffer);
buffer = NULL;
if (stream->downloading_index) {
GstIsoffParserResult res;
guint consumed;
gsize available;
available = gst_adapter_available (dash_stream->sidx_adapter);
buffer = gst_adapter_take_buffer (dash_stream->sidx_adapter, available);
if (dash_stream->sidx_parser.status != GST_ISOFF_SIDX_PARSER_FINISHED) {
res =
gst_isoff_sidx_parser_add_buffer (&dash_stream->sidx_parser, buffer,
&consumed);
if (res == GST_ISOFF_PARSER_ERROR) {
} else if (res == GST_ISOFF_PARSER_UNEXPECTED) {
/* this is not a 'sidx' index, just skip it and continue playback */
} else {
/* when finished, prepare for real data streaming */
if (dash_stream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) {
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 {
gint idx = 0;
if (dash_stream->sidx_position == GST_CLOCK_TIME_NONE) {
idx = 0;
} else {
gint i;
/* Set sidx index to the highest entry that is smaller than our
* remembered position */
for (i = 0; i < SIDX (dash_stream)->entries_count; i++) {
idx = i;
if (SIDX_ENTRY (dash_stream, i)->pts + SIDX_ENTRY (dash_stream,
i)->duration > dash_stream->sidx_position)
break;
}
}
SIDX (dash_stream)->entry_index = idx;
}
} else if (consumed < available) {
GstBuffer *pending;
/* we still need to keep some data around for the next parsing round
* so just push what was already processed by the parser */
pending = _gst_buffer_split (buffer, consumed, -1);
gst_adapter_push (dash_stream->sidx_adapter, pending);
}
}
}
GST_BUFFER_OFFSET (buffer) = dash_stream->sidx_current_offset;
GST_BUFFER_OFFSET_END (buffer) =
GST_BUFFER_OFFSET (buffer) + gst_buffer_get_size (buffer);
dash_stream->sidx_current_offset = GST_BUFFER_OFFSET_END (buffer);
ret = gst_adaptive_demux_stream_push_buffer (stream, buffer);
} else if (dash_stream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) {
gsize available;
if (G_UNLIKELY (dash_stream->pending_seek_ts != GST_CLOCK_TIME_NONE))
dash_stream->pending_seek_ts = GST_CLOCK_TIME_NONE;
while (ret == GST_FLOW_OK
&& ((available =
gst_adapter_available (dash_stream->sidx_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->sidx_current_offset + available < sidx_end_offset) {
buffer = gst_adapter_take_buffer (dash_stream->sidx_adapter, available);
} else {
/* In key-units mode, we advance the fragments manually once the
* current key-unit is over but throw away all data that is after
* the current sidx entry end */
if (dash_stream->moof_sync_samples
&& (GST_ADAPTIVE_DEMUX (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS)) {
if (sidx_end_offset <= dash_stream->sidx_current_offset) {
buffer = NULL;
gst_adapter_clear (dash_stream->sidx_adapter);
} else {
buffer =
gst_adapter_take_buffer (dash_stream->sidx_adapter,
sidx_end_offset - dash_stream->sidx_current_offset);
}
} else if (!has_next
&& sidx_end_offset <= dash_stream->sidx_current_offset) {
/* Drain all bytes, since there might be trailing bytes at the end of subfragment */
buffer =
gst_adapter_take_buffer (dash_stream->sidx_adapter, available);
} else {
buffer =
gst_adapter_take_buffer (dash_stream->sidx_adapter,
sidx_end_offset - dash_stream->sidx_current_offset);
advance = TRUE;
}
}
if (buffer != NULL) {
GST_BUFFER_OFFSET (buffer) = dash_stream->sidx_current_offset;
GST_BUFFER_OFFSET_END (buffer) =
GST_BUFFER_OFFSET (buffer) + gst_buffer_get_size (buffer);
dash_stream->sidx_current_offset = GST_BUFFER_OFFSET_END (buffer);
if (dash_stream->is_isobmff)
ret = gst_dash_demux_handle_isobmff_buffer (demux, stream, buffer);
else
ret = gst_adaptive_demux_stream_push_buffer (stream, buffer);
if (!(dash_stream->moof_sync_samples
&& (GST_ADAPTIVE_DEMUX (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS))
&& 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->sidx_adapter,
gst_adapter_available (dash_stream->sidx_adapter));
GST_BUFFER_OFFSET (buffer) = dash_stream->sidx_current_offset;
GST_BUFFER_OFFSET_END (buffer) =
GST_BUFFER_OFFSET (buffer) + gst_buffer_get_size (buffer);
dash_stream->sidx_current_offset = GST_BUFFER_OFFSET_END (buffer);
if (dash_stream->is_isobmff)
return gst_dash_demux_handle_isobmff_buffer (demux, stream, buffer);
else
return 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->sidx_adapter)
g_object_unref (dash_stream->sidx_adapter);
if (dash_stream->isobmff_adapter)
g_object_unref (dash_stream->isobmff_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);
g_free (dash_stream->last_representation_id);
}
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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