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gstreamer/ext/dash/gstdashdemux.c
Chris Bass 6342d225bf dashdemux: ensure segments aren't fetched before they're available 
Incorrect time scaling in gst_dash_demux_wait_for_fragment_to_be_available()
means that media segments are fetched before their availablity time. This
patch fixes this.

https://bugzilla.gnome.org/show_bug.cgi?id=724875
2014-02-22 16:29:13 +01:00

2095 lines
66 KiB
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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 playbin2 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 <inttypes.h>
#include <gst/base/gsttypefindhelper.h>
#include "gst/gst-i18n-plugin.h"
#include "gstdashdemux.h"
#include "gstdash_debug.h"
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src_%u",
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_LAST
};
/* Default values for properties */
#define DEFAULT_MAX_BUFFERING_TIME 30 /* in seconds */
#define DEFAULT_BANDWIDTH_USAGE 0.8 /* 0 to 1 */
#define DEFAULT_MAX_BITRATE 24000000 /* in bit/s */
#define DEFAULT_FAILED_COUNT 3
#define DOWNLOAD_RATE_HISTORY_MAX 3
#define GST_DASH_DEMUX_CLIENT_LOCK(d) g_mutex_lock (&d->client_lock)
#define GST_DASH_DEMUX_CLIENT_UNLOCK(d) g_mutex_unlock (&d->client_lock)
/* 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);
/* GstElement */
static GstStateChangeReturn
gst_dash_demux_change_state (GstElement * element, GstStateChange transition);
/* GstDashDemux */
static GstFlowReturn gst_dash_demux_pad (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static gboolean gst_dash_demux_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_dash_demux_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_dash_demux_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static void gst_dash_demux_stream_download_loop (GstDashDemuxStream * stream);
static void gst_dash_demux_stop (GstDashDemux * demux);
static void gst_dash_demux_wait_stop (GstDashDemux * demux);
static void gst_dash_demux_resume_download_task (GstDashDemux * demux);
static gboolean gst_dash_demux_setup_all_streams (GstDashDemux * demux);
static GstEvent
* gst_dash_demux_stream_select_representation_unlocked (GstDashDemuxStream *
stream);
static GstFlowReturn gst_dash_demux_stream_get_next_fragment (GstDashDemuxStream
* stream, GstClockTime * ts);
static gboolean gst_dash_demux_advance_period (GstDashDemux * demux);
static void gst_dash_demux_download_wait (GstDashDemuxStream * stream,
GstClockTime time_diff);
static void gst_dash_demux_expose_streams (GstDashDemux * demux);
static void gst_dash_demux_remove_streams (GstDashDemux * demux,
GSList * streams);
static void gst_dash_demux_stream_free (GstDashDemuxStream * stream);
static void gst_dash_demux_reset (GstDashDemux * demux, gboolean dispose);
static GstCaps *gst_dash_demux_get_input_caps (GstDashDemux * demux,
GstActiveStream * stream);
static GstPad *gst_dash_demux_create_pad (GstDashDemux * demux);
#define gst_dash_demux_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstDashDemux, gst_dash_demux, GST_TYPE_ELEMENT,
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 (demux, TRUE);
if (demux->downloader != NULL) {
g_object_unref (demux->downloader);
demux->downloader = NULL;
}
g_mutex_clear (&demux->client_lock);
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
static void
gst_dash_demux_class_init (GstDashDemuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) 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;
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",
2, G_MAXUINT, DEFAULT_MAX_BUFFERING_TIME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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",
0, 1, DEFAULT_BANDWIDTH_USAGE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_BITRATE,
g_param_spec_uint ("max-bitrate", "Max bitrate",
"Max of bitrate supported by target decoder",
1000, G_MAXUINT, DEFAULT_MAX_BITRATE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_dash_demux_change_state);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sinktemplate));
gst_element_class_set_static_metadata (gstelement_class,
"DASH Demuxer",
"Codec/Demuxer",
"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>");
}
static void
gst_dash_demux_init (GstDashDemux * demux)
{
/* sink pad */
demux->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
gst_pad_set_chain_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_dash_demux_pad));
gst_pad_set_event_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_dash_demux_sink_event));
gst_element_add_pad (GST_ELEMENT (demux), demux->sinkpad);
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
/* Downloader */
demux->downloader = gst_uri_downloader_new ();
/* Properties */
demux->max_buffering_time = DEFAULT_MAX_BUFFERING_TIME * GST_SECOND;
demux->bandwidth_usage = DEFAULT_BANDWIDTH_USAGE;
demux->max_bitrate = DEFAULT_MAX_BITRATE;
demux->last_manifest_update = GST_CLOCK_TIME_NONE;
g_mutex_init (&demux->client_lock);
}
static void
gst_dash_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
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:
demux->bandwidth_usage = g_value_get_float (value);
break;
case PROP_MAX_BITRATE:
demux->max_bitrate = g_value_get_uint (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)
{
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, demux->bandwidth_usage);
break;
case PROP_MAX_BITRATE:
g_value_set_uint (value, demux->max_bitrate);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_dash_demux_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstDashDemux *demux = GST_DASH_DEMUX (element);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_dash_demux_reset (demux, FALSE);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
default:
break;
}
return ret;
}
static gboolean
gst_dash_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstDashDemux *demux;
demux = GST_DASH_DEMUX (parent);
switch (event->type) {
case GST_EVENT_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;
GSList *iter;
gboolean update;
GST_INFO_OBJECT (demux, "Received seek event");
if (gst_mpd_client_is_live (demux->client)) {
GST_WARNING_OBJECT (demux, "Received seek event for live stream");
return FALSE;
}
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
if (format != GST_FORMAT_TIME)
return FALSE;
GST_DEBUG_OBJECT (demux,
"seek event, rate: %f type: %d start: %" GST_TIME_FORMAT " stop: %"
GST_TIME_FORMAT, rate, start_type, GST_TIME_ARGS (start),
GST_TIME_ARGS (stop));
gst_segment_do_seek (&demux->segment, rate, format, flags, start_type,
start, stop_type, stop, &update);
if (update) {
GstEvent *seg_evt;
GST_DASH_DEMUX_CLIENT_LOCK (demux);
if (flags & GST_SEEK_FLAG_FLUSH) {
GST_DEBUG_OBJECT (demux, "sending flush start");
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream;
stream = iter->data;
gst_pad_push_event (stream->pad, gst_event_new_flush_start ());
}
}
gst_dash_demux_stop (demux);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
gst_dash_demux_wait_stop (demux);
/* select the requested Period in the Media Presentation */
target_pos = (GstClockTime) demux->segment.start;
GST_DEBUG_OBJECT (demux, "Seeking to target %" GST_TIME_FORMAT,
GST_TIME_ARGS (target_pos));
current_period = 0;
for (list = g_list_first (demux->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 pos %" GST_TIME_FORMAT,
current_period, GST_TIME_ARGS (current_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;
}
if (current_period != gst_mpd_client_get_period_index (demux->client)) {
GSList *streams = NULL;
GST_DEBUG_OBJECT (demux, "Seeking to Period %d", current_period);
streams = demux->streams;
demux->streams = NULL;
/* clean old active stream list, if any */
gst_active_streams_free (demux->client);
/* setup video, audio and subtitle streams, starting from the new Period */
if (!gst_mpd_client_set_period_index (demux->client, current_period)
|| !gst_dash_demux_setup_all_streams (demux))
return FALSE;
gst_dash_demux_expose_streams (demux);
gst_dash_demux_remove_streams (demux, streams);
}
/* Update the current sequence on all streams */
seg_evt = gst_event_new_segment (&demux->segment);
gst_event_set_seqnum (seg_evt, gst_event_get_seqnum (event));
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
gst_mpd_client_stream_seek (demux->client, stream->active_stream,
target_pos);
gst_event_replace (&stream->pending_segment, seg_evt);
}
gst_event_unref (seg_evt);
if (flags & GST_SEEK_FLAG_FLUSH) {
GST_DEBUG_OBJECT (demux, "Sending flush stop on all pad");
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream;
stream = iter->data;
stream->need_header = TRUE;
stream->stream_eos = FALSE;
gst_pad_push_event (stream->pad, gst_event_new_flush_stop (TRUE));
}
}
/* Restart the demux */
GST_DASH_DEMUX_CLIENT_LOCK (demux);
demux->cancelled = FALSE;
demux->end_of_manifest = FALSE;
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
stream->last_ret = GST_FLOW_OK;
gst_uri_downloader_reset (stream->downloader);
}
demux->timestamp_offset = 0;
gst_uri_downloader_reset (demux->downloader);
GST_DEBUG_OBJECT (demux, "Resuming tasks after seeking");
gst_dash_demux_resume_download_task (demux);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
}
return TRUE;
}
case GST_EVENT_RECONFIGURE:{
GSList *iter;
GST_DASH_DEMUX_CLIENT_LOCK (demux);
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
if (stream->pad == pad) {
if (stream->last_ret == GST_FLOW_NOT_LINKED) {
stream->last_ret = GST_FLOW_OK;
stream->restart_download = TRUE;
stream->need_header = TRUE;
GST_DEBUG_OBJECT (stream->pad, "Restarting download loop");
gst_task_start (stream->download_task);
}
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
gst_event_unref (event);
return TRUE;
}
}
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
}
break;
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
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_all_streams_eop (GstDashDemux * demux)
{
GSList *iter = NULL;
GST_DEBUG_OBJECT (demux, "Checking if all streams are EOP");
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
GST_LOG_OBJECT (stream->pad, "EOP: %d (linked: %d)", stream->stream_eos,
stream->last_ret != GST_FLOW_NOT_LINKED);
if (!stream->stream_eos && stream->last_ret != GST_FLOW_NOT_LINKED)
return FALSE;
}
return TRUE;
}
static gboolean
gst_dash_demux_setup_all_streams (GstDashDemux * demux)
{
guint i;
GSList *streams = NULL;
GST_DEBUG_OBJECT (demux, "Setting up streams for period %d",
gst_mpd_client_get_period_index (demux->client));
GST_MPD_CLIENT_LOCK (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;
GstEvent *event;
gchar *stream_id;
active_stream = gst_mpdparser_get_active_stream_by_index (demux->client, i);
if (active_stream == NULL)
continue;
stream = g_new0 (GstDashDemuxStream, 1);
stream->demux = demux;
stream->active_stream = active_stream;
caps = gst_dash_demux_get_input_caps (demux, active_stream);
g_rec_mutex_init (&stream->download_task_lock);
stream->download_task =
gst_task_new ((GstTaskFunction) gst_dash_demux_stream_download_loop,
stream, NULL);
gst_task_set_lock (stream->download_task, &stream->download_task_lock);
g_cond_init (&stream->download_cond);
g_mutex_init (&stream->download_mutex);
stream->downloader = gst_uri_downloader_new ();
stream->index = i;
stream->input_caps = caps;
stream->need_header = TRUE;
gst_download_rate_init (&stream->dnl_rate);
gst_download_rate_set_max_length (&stream->dnl_rate,
DOWNLOAD_RATE_HISTORY_MAX);
GST_LOG_OBJECT (demux, "Creating stream %d %" GST_PTR_FORMAT, i, caps);
streams = g_slist_prepend (streams, stream);
stream->pad = gst_dash_demux_create_pad (demux);
stream_id =
gst_pad_create_stream_id_printf (stream->pad,
GST_ELEMENT_CAST (demux), "%d", i);
event =
gst_pad_get_sticky_event (demux->sinkpad, GST_EVENT_STREAM_START, 0);
if (event) {
if (gst_event_parse_group_id (event, &demux->group_id))
demux->have_group_id = TRUE;
else
demux->have_group_id = FALSE;
gst_event_unref (event);
} else if (!demux->have_group_id) {
demux->have_group_id = TRUE;
demux->group_id = gst_util_group_id_next ();
}
event = gst_event_new_stream_start (stream_id);
if (demux->have_group_id)
gst_event_set_group_id (event, demux->group_id);
gst_pad_push_event (stream->pad, event);
g_free (stream_id);
gst_pad_push_event (stream->pad, gst_event_new_caps (caps));
}
streams = g_slist_reverse (streams);
demux->next_periods = g_slist_append (demux->next_periods, streams);
GST_MPD_CLIENT_UNLOCK (demux->client);
return TRUE;
}
static gboolean
gst_dash_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstDashDemux *demux = GST_DASH_DEMUX (parent);
switch (event->type) {
case GST_EVENT_FLUSH_STOP:
gst_dash_demux_reset (demux, FALSE);
break;
case GST_EVENT_EOS:{
gchar *manifest;
GstQuery *query;
gboolean query_res;
gboolean ret = TRUE;
GstMapInfo mapinfo;
if (demux->manifest == NULL) {
GST_WARNING_OBJECT (demux, "Received EOS without a manifest.");
break;
}
GST_DEBUG_OBJECT (demux, "Got EOS on the sink pad: manifest fetched");
GST_DASH_DEMUX_CLIENT_LOCK (demux);
if (demux->client)
gst_mpd_client_free (demux->client);
demux->client = gst_mpd_client_new ();
query = gst_query_new_uri ();
query_res = gst_pad_peer_query (pad, query);
if (query_res) {
gst_query_parse_uri (query, &demux->client->mpd_uri);
GST_DEBUG_OBJECT (demux, "Fetched MPD file at URI: %s",
demux->client->mpd_uri);
} else {
GST_WARNING_OBJECT (demux, "MPD URI query failed.");
}
gst_query_unref (query);
if (gst_buffer_map (demux->manifest, &mapinfo, GST_MAP_READ)) {
manifest = (gchar *) mapinfo.data;
if (!gst_mpd_parse (demux->client, manifest, mapinfo.size)) {
/* 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_ELEMENT_ERROR (demux, STREAM, DECODE, ("Invalid manifest."),
(NULL));
ret = FALSE;
}
gst_buffer_unmap (demux->manifest, &mapinfo);
} else {
GST_WARNING_OBJECT (demux, "Error validating the manifest.");
ret = FALSE;
}
gst_buffer_unref (demux->manifest);
demux->manifest = NULL;
if (!ret)
goto seek_quit;
if (!gst_mpd_client_setup_media_presentation (demux->client)) {
GST_ELEMENT_ERROR (demux, STREAM, DECODE,
("Incompatible manifest file."), (NULL));
ret = FALSE;
goto seek_quit;
}
/* setup video, audio and subtitle streams, starting from first Period */
if (!gst_mpd_client_set_period_index (demux->client, 0) ||
!gst_dash_demux_setup_all_streams (demux)) {
ret = FALSE;
goto seek_quit;
}
gst_dash_demux_advance_period (demux);
/* If stream is live, try to find the segment that is closest to current time */
if (gst_mpd_client_is_live (demux->client)) {
GSList *iter;
GstDateTime *now = gst_date_time_new_now_utc ();
gint seg_idx;
GST_DEBUG_OBJECT (demux,
"Seeking to current time of day for live stream ");
if (demux->client->mpd_node->suggestedPresentationDelay != -1) {
GstDateTime *target = gst_mpd_client_add_time_difference (now,
demux->client->mpd_node->suggestedPresentationDelay * -1000);
gst_date_time_unref (now);
now = target;
}
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
GstActiveStream *active_stream = stream->active_stream;
/* Get segment index corresponding to current time. */
seg_idx =
gst_mpd_client_get_segment_index_at_time (demux->client,
active_stream, now);
if (seg_idx < 0) {
GST_WARNING_OBJECT (demux,
"Failed to find a segment that is available "
"at this point in time for stream %d.", stream->index);
seg_idx = 0;
}
GST_INFO_OBJECT (demux,
"Segment index corresponding to current time for stream "
"%d is %d.", stream->index, seg_idx);
gst_mpd_client_set_segment_index (active_stream, seg_idx);
}
gst_date_time_unref (now);
} else {
GST_DEBUG_OBJECT (demux,
"Seeking to first segment for on-demand stream ");
/* start playing from the first segment */
gst_mpd_client_set_segment_index_for_all_streams (demux->client, 0);
}
/* Send duration message */
if (!gst_mpd_client_is_live (demux->client)) {
GstClockTime duration =
gst_mpd_client_get_media_presentation_duration (demux->client);
if (duration != GST_CLOCK_TIME_NONE) {
GST_DEBUG_OBJECT (demux,
"Sending duration message : %" GST_TIME_FORMAT,
GST_TIME_ARGS (duration));
gst_element_post_message (GST_ELEMENT (demux),
gst_message_new_duration_changed (GST_OBJECT (demux)));
} else {
GST_DEBUG_OBJECT (demux,
"mediaPresentationDuration unknown, can not send the duration message");
}
}
demux->timestamp_offset = -1;
gst_dash_demux_resume_download_task (demux);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
seek_quit:
gst_event_unref (event);
return ret;
}
case GST_EVENT_SEGMENT:
/* Swallow newsegments, we'll push our own */
gst_event_unref (event);
return TRUE;
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
static gboolean
gst_dash_demux_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstDashDemux *dashdemux;
gboolean ret = FALSE;
if (query == NULL)
return FALSE;
dashdemux = GST_DASH_DEMUX (parent);
switch (query->type) {
case GST_QUERY_DURATION:{
GstClockTime duration = -1;
GstFormat fmt;
gst_query_parse_duration (query, &fmt, NULL);
if (fmt == GST_FORMAT_TIME) {
duration =
gst_mpd_client_get_media_presentation_duration (dashdemux->client);
if (GST_CLOCK_TIME_IS_VALID (duration) && duration > 0) {
gst_query_set_duration (query, GST_FORMAT_TIME, duration);
ret = TRUE;
}
}
GST_DEBUG_OBJECT (dashdemux,
"GST_QUERY_DURATION returns %s with duration %" GST_TIME_FORMAT,
ret ? "TRUE" : "FALSE", GST_TIME_ARGS (duration));
break;
}
case GST_QUERY_SEEKING:{
GstFormat fmt;
gint64 start;
gint64 end;
gint64 stop = -1;
gst_query_parse_seeking (query, &fmt, NULL, &start, &end);
GST_DEBUG_OBJECT (dashdemux,
"Received GST_QUERY_SEEKING with format %d - %" G_GINT64_FORMAT
" %" G_GINT64_FORMAT, fmt, start, end);
if (fmt == GST_FORMAT_TIME) {
GstClockTime duration;
duration =
gst_mpd_client_get_media_presentation_duration (dashdemux->client);
if (GST_CLOCK_TIME_IS_VALID (duration) && duration > 0)
stop = duration;
gst_query_set_seeking (query, fmt,
!gst_mpd_client_is_live (dashdemux->client), 0, stop);
ret = TRUE;
GST_DEBUG_OBJECT (dashdemux, "GST_QUERY_SEEKING returning with stop : %"
GST_TIME_FORMAT, GST_TIME_ARGS (stop));
}
break;
}
case GST_QUERY_LATENCY:
{
gboolean live;
GstClockTime min, max;
gst_query_parse_latency (query, &live, &min, &max);
if (dashdemux->client && gst_mpd_client_is_live (dashdemux->client))
live = TRUE;
if (dashdemux->max_buffering_time > 0)
max += dashdemux->max_buffering_time;
gst_query_set_latency (query, live, min, max);
ret = TRUE;
break;
}
default:{
/* By default, do not forward queries upstream */
break;
}
}
return ret;
}
static GstFlowReturn
gst_dash_demux_pad (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstDashDemux *demux = GST_DASH_DEMUX (parent);
if (demux->manifest == NULL)
demux->manifest = buf;
else
demux->manifest = gst_buffer_append (demux->manifest, buf);
return GST_FLOW_OK;
}
static void
gst_dash_demux_wait_stop (GstDashDemux * demux)
{
GSList *iter;
GST_DEBUG_OBJECT (demux, "Waiting for threads to stop");
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
gst_task_join (stream->download_task);
}
}
static void
gst_dash_demux_stop (GstDashDemux * demux)
{
GSList *iter;
GST_DEBUG_OBJECT (demux, "Stopping demux");
demux->cancelled = TRUE;
if (demux->downloader)
gst_uri_downloader_cancel (demux->downloader);
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
stream->last_ret = GST_FLOW_FLUSHING;
stream->need_header = TRUE;
gst_task_stop (stream->download_task);
GST_TASK_SIGNAL (stream->download_task);
gst_uri_downloader_cancel (stream->downloader);
}
}
static GstPad *
gst_dash_demux_create_pad (GstDashDemux * demux)
{
GstPad *pad;
/* Create and activate new pads */
pad = gst_pad_new_from_static_template (&srctemplate, NULL);
gst_pad_set_event_function (pad,
GST_DEBUG_FUNCPTR (gst_dash_demux_src_event));
gst_pad_set_query_function (pad,
GST_DEBUG_FUNCPTR (gst_dash_demux_src_query));
gst_pad_set_element_private (pad, demux);
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_expose_streams (GstDashDemux * demux)
{
GSList *iter;
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
GST_LOG_OBJECT (stream->pad, "Exposing stream %d %" GST_PTR_FORMAT,
stream->index, stream->input_caps);
gst_element_add_pad (GST_ELEMENT (demux), gst_object_ref (stream->pad));
}
gst_element_no_more_pads (GST_ELEMENT_CAST (demux));
}
static void
gst_dash_demux_remove_streams (GstDashDemux * demux, GSList * streams)
{
GSList *iter;
GstEvent *eos = gst_event_new_eos ();
for (iter = streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;;
GST_LOG_OBJECT (stream->pad, "Removing stream %d %" GST_PTR_FORMAT,
stream->index, stream->input_caps);
gst_pad_push_event (stream->pad, gst_event_ref (eos));
gst_pad_set_active (stream->pad, FALSE);
gst_element_remove_pad (GST_ELEMENT (demux), stream->pad);
gst_dash_demux_stream_free (stream);
}
gst_event_unref (eos);
g_slist_free (streams);
}
static gboolean
gst_dash_demux_advance_period (GstDashDemux * demux)
{
GSList *old_period = NULL;
GSList *iter;
GstEvent *seg_evt;
GST_DEBUG_OBJECT (demux, "Advancing period from %p", demux->streams);
if (demux->streams) {
g_assert (demux->streams == demux->next_periods->data);
demux->next_periods = g_slist_remove (demux->next_periods, demux->streams);
old_period = demux->streams;
demux->streams = NULL;
}
GST_DEBUG_OBJECT (demux, "Next period %p", demux->next_periods);
if (demux->next_periods) {
demux->streams = demux->next_periods->data;
} else {
GST_DEBUG_OBJECT (demux, "No next periods, return FALSE");
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
return FALSE;
}
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
/* TODO protect with lock, using the client lock isn't useful
* because causes deadlocks with the event_src handler */
gst_dash_demux_expose_streams (demux);
seg_evt = gst_event_new_segment (&demux->segment);
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
gst_event_replace (&stream->pending_segment, seg_evt);
}
gst_event_unref (seg_evt);
gst_dash_demux_remove_streams (demux, old_period);
GST_DASH_DEMUX_CLIENT_LOCK (demux);
return TRUE;
}
static GstFlowReturn
gst_dash_demux_push (GstDashDemuxStream * stream, GstBuffer * buffer)
{
GstDashDemux *demux = stream->demux;
GstClockTime timestamp, duration;
GstFlowReturn ret = GST_FLOW_OK;
timestamp = GST_BUFFER_TIMESTAMP (buffer);
if (stream->pending_segment) {
if (demux->timestamp_offset == -1)
demux->timestamp_offset = timestamp;
else
demux->timestamp_offset = MIN (timestamp, demux->timestamp_offset);
/* And send a newsegment */
gst_pad_push_event (stream->pad, stream->pending_segment);
stream->pending_segment = NULL;
}
/* make timestamp start from 0 by subtracting the offset */
timestamp -= demux->timestamp_offset;
duration = GST_BUFFER_DURATION (buffer);
GST_BUFFER_TIMESTAMP (buffer) = timestamp;
GST_DEBUG_OBJECT (stream->pad,
"Pushing fragment %p #%" G_GUINT64_FORMAT " (stream %d) ts:%"
GST_TIME_FORMAT " dur:%" GST_TIME_FORMAT, buffer,
GST_BUFFER_OFFSET (buffer), stream->index,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
ret = gst_pad_push (stream->pad, gst_buffer_ref (buffer));
GST_DEBUG_OBJECT (stream->pad, "Push result: %d %s", ret,
gst_flow_get_name (ret));
demux->segment.position = timestamp;
stream->position = timestamp;
if (GST_CLOCK_TIME_IS_VALID (duration))
stream->position += duration;
return ret;
}
static void
gst_dash_demux_stream_free (GstDashDemuxStream * stream)
{
gst_download_rate_deinit (&stream->dnl_rate);
if (stream->input_caps) {
gst_caps_unref (stream->input_caps);
stream->input_caps = NULL;
}
if (stream->pending_segment) {
gst_event_unref (stream->pending_segment);
}
if (stream->pad) {
gst_object_unref (stream->pad);
stream->pad = NULL;
}
if (stream->download_task) {
gst_task_stop (stream->download_task);
gst_object_unref (stream->download_task);
g_rec_mutex_clear (&stream->download_task_lock);
}
g_cond_clear (&stream->download_cond);
g_mutex_clear (&stream->download_mutex);
if (stream->downloader != NULL) {
g_object_unref (stream->downloader);
}
g_free (stream);
}
static void
gst_dash_demux_reset (GstDashDemux * demux, gboolean dispose)
{
GSList *iter;
GST_DEBUG_OBJECT (demux, "Resetting demux");
demux->end_of_period = FALSE;
demux->end_of_manifest = FALSE;
gst_dash_demux_stop (demux);
gst_dash_demux_wait_stop (demux);
if (demux->downloader)
gst_uri_downloader_reset (demux->downloader);
if (demux->next_periods) {
g_assert (demux->next_periods->data == demux->streams);
demux->next_periods =
g_slist_delete_link (demux->next_periods, demux->next_periods);
}
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
if (stream->pad) {
GST_INFO_OBJECT (demux, "Removing stream pad %s:%s",
GST_DEBUG_PAD_NAME (stream->pad));
gst_element_remove_pad (GST_ELEMENT (demux), stream->pad);
}
gst_dash_demux_stream_free (stream);
}
g_slist_free (demux->streams);
demux->streams = NULL;
for (iter = demux->next_periods; iter; iter = g_slist_next (iter)) {
GSList *streams = iter->data;
g_slist_free_full (streams, (GDestroyNotify) gst_dash_demux_stream_free);
}
g_slist_free (demux->next_periods);
demux->next_periods = NULL;
if (demux->manifest) {
gst_buffer_unref (demux->manifest);
demux->manifest = NULL;
}
if (demux->client) {
gst_mpd_client_free (demux->client);
demux->client = NULL;
}
if (!dispose) {
demux->client = gst_mpd_client_new ();
}
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
demux->last_manifest_update = GST_CLOCK_TIME_NONE;
demux->cancelled = FALSE;
}
static GstFlowReturn
gst_dash_demux_refresh_mpd (GstDashDemux * demux)
{
GstFragment *download;
GstBuffer *buffer;
GstClockTime duration, now = gst_util_get_timestamp ();
gint64 update_period = demux->client->mpd_node->minimumUpdatePeriod;
if (update_period == -1) {
GST_DEBUG_OBJECT (demux, "minimumUpdatePeriod unspecified, "
"will not update MPD");
return GST_FLOW_OK;
}
/* init reference time for manifest file updates */
if (!GST_CLOCK_TIME_IS_VALID (demux->last_manifest_update))
demux->last_manifest_update = now;
GST_DEBUG_OBJECT (demux,
"Next update: %" GST_TIME_FORMAT " now: %" GST_TIME_FORMAT,
GST_TIME_ARGS ((demux->last_manifest_update +
update_period * GST_MSECOND)), GST_TIME_ARGS (now));
/* update the manifest file */
if (now >= demux->last_manifest_update + update_period * GST_MSECOND) {
GST_DEBUG_OBJECT (demux, "Updating manifest file from URL %s",
demux->client->mpd_uri);
download = gst_uri_downloader_fetch_uri (demux->downloader,
demux->client->mpd_uri, TRUE, NULL);
if (download) {
GstMpdClient *new_client = NULL;
buffer = gst_fragment_get_buffer (download);
g_object_unref (download);
/* parse the manifest file */
if (buffer != NULL) {
GstMapInfo mapinfo;
new_client = gst_mpd_client_new ();
new_client->mpd_uri = g_strdup (demux->client->mpd_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;
GSList *iter;
/* prepare the new manifest and try to transfer the stream position
* status from the old manifest client */
gst_buffer_unmap (buffer, &mapinfo);
gst_buffer_unref (buffer);
GST_DEBUG_OBJECT (demux, "Updating manifest");
period_id = gst_mpd_client_get_period_id (demux->client);
period_idx = gst_mpd_client_get_period_index (demux->client);
/* setup video, audio and subtitle streams, starting from current Period */
if (!gst_mpd_client_setup_media_presentation (new_client)) {
/* TODO */
}
if (period_idx) {
if (!gst_mpd_client_set_period_id (new_client, period_id)) {
GST_DEBUG_OBJECT (demux,
"Error setting up the updated manifest file");
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");
return GST_FLOW_EOS;
}
}
if (!gst_dash_demux_setup_mpdparser_streams (demux, new_client)) {
GST_ERROR_OBJECT (demux, "Failed to setup streams on manifest "
"update");
return GST_FLOW_ERROR;
}
/* update the streams to play from the next segment */
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *demux_stream = iter->data;
GstActiveStream *new_stream = demux_stream->active_stream;
GstClockTime ts;
if (!new_stream) {
GST_DEBUG_OBJECT (demux,
"Stream of index %d is missing from manifest update",
demux_stream->index);
return GST_FLOW_EOS;
}
if (gst_mpd_client_get_next_fragment_timestamp (demux->client,
demux_stream->index, &ts)) {
gst_mpd_client_stream_seek (new_client, new_stream, ts);
} else
if (gst_mpd_client_get_last_fragment_timestamp (demux->client,
demux_stream->index, &ts)) {
/* try to set to the old timestamp + 1 */
gst_mpd_client_stream_seek (new_client, new_stream, ts + 1);
}
}
gst_mpd_client_free (demux->client);
demux->client = new_client;
/* Send an updated duration message */
duration =
gst_mpd_client_get_media_presentation_duration (demux->client);
if (duration != GST_CLOCK_TIME_NONE) {
GST_DEBUG_OBJECT (demux,
"Sending duration message : %" GST_TIME_FORMAT,
GST_TIME_ARGS (duration));
gst_element_post_message (GST_ELEMENT (demux),
gst_message_new_duration_changed (GST_OBJECT (demux)));
} else {
GST_DEBUG_OBJECT (demux,
"mediaPresentationDuration unknown, can not send the duration message");
}
demux->last_manifest_update = gst_util_get_timestamp ();
GST_DEBUG_OBJECT (demux, "Manifest file successfully updated");
} 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_buffer_unmap (buffer, &mapinfo);
gst_buffer_unref (buffer);
}
} else {
/* download suceeded, but resulting buffer is NULL */
GST_WARNING_OBJECT (demux, "Error validating the manifest.");
}
} else {
/* download failed */
GST_WARNING_OBJECT (demux,
"Failed to update the manifest file from URL %s",
demux->client->mpd_uri);
}
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_dash_demux_combine_flows (GstDashDemux * demux)
{
gboolean all_notlinked = TRUE;
GSList *iter;
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
if (stream->last_ret != GST_FLOW_NOT_LINKED)
all_notlinked = FALSE;
if (stream->last_ret <= GST_FLOW_NOT_NEGOTIATED
|| stream->last_ret == GST_FLOW_FLUSHING)
return stream->last_ret;
}
if (all_notlinked)
return GST_FLOW_NOT_LINKED;
return GST_FLOW_OK;
}
/* gst_dash_demux_stream_download_loop:
*
* Loop for the "download' task that fetches fragments based on the
* selected representations.
*
* During playback:
*
* It sequentially fetches fragments corresponding to the current
* representations and pushes them downstream
*
* When a new set of fragments has been downloaded, it evaluates the
* download time to check if we can or should switch to a different
* set of representations.
*
* Teardown:
*
* The task will exit when it encounters an error or when the end of the
* manifest has been reached.
*/
static void
gst_dash_demux_stream_download_loop (GstDashDemuxStream * stream)
{
GstDashDemux *demux = stream->demux;
GstFlowReturn flow_ret = GST_FLOW_OK;
GstClockTime fragment_ts = GST_CLOCK_TIME_NONE;
GstEvent *caps_event;
GST_LOG_OBJECT (stream->pad, "Starting download loop");
GST_DASH_DEMUX_CLIENT_LOCK (demux);
if (demux->cancelled) {
goto cancelled;
}
if (gst_mpd_client_is_live (demux->client)
&& demux->client->mpd_uri != NULL) {
switch (gst_dash_demux_refresh_mpd (demux)) {
case GST_FLOW_EOS:
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
goto end_of_manifest;
default:
break;
}
}
/* try to switch to another set of representations if needed */
caps_event = gst_dash_demux_stream_select_representation_unlocked (stream);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
if (G_UNLIKELY (caps_event && !gst_pad_push_event (stream->pad, caps_event))) {
/* TODO fail if caps is rejected */
}
/* fetch the next fragment */
flow_ret = gst_dash_demux_stream_get_next_fragment (stream, &fragment_ts);
GST_DASH_DEMUX_CLIENT_LOCK (demux);
if (demux->cancelled) {
goto cancelled;
}
stream->last_ret = flow_ret;
switch (flow_ret) {
case GST_FLOW_OK:
break;
case GST_FLOW_NOT_LINKED:
gst_task_pause (stream->download_task);
if (gst_dash_demux_combine_flows (demux) == GST_FLOW_NOT_LINKED) {
GST_ELEMENT_ERROR (demux, STREAM, FAILED,
(_("Internal data stream error.")),
("stream stopped, reason %s",
gst_flow_get_name (GST_FLOW_NOT_LINKED)));
}
break;
case GST_FLOW_FLUSHING:
gst_dash_demux_stop (demux);
break;
case GST_FLOW_EOS:
GST_DEBUG_OBJECT (stream->pad, "EOS");
stream->stream_eos = TRUE;
if (gst_dash_demux_all_streams_eop (demux)) {
GST_INFO_OBJECT (stream->pad, "Reached the end of the Period");
if (gst_mpd_client_has_next_period (demux->client)) {
GST_INFO_OBJECT (demux, "Starting next period");
/* setup video, audio and subtitle streams, starting from the next Period */
if (!gst_mpd_client_set_period_index (demux->client,
gst_mpd_client_get_period_index (demux->client) + 1)
|| !gst_dash_demux_setup_all_streams (demux)) {
}
stream->last_ret = GST_FLOW_OK;
/* start playing from the first segment of the new period */
gst_mpd_client_set_segment_index_for_all_streams (demux->client, 0);
gst_dash_demux_advance_period (demux);
gst_dash_demux_resume_download_task (demux);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
/* This pad is now finished, we lost its reference */
return;
}
}
gst_task_pause (stream->download_task);
break;
case GST_FLOW_ERROR:
/* Download failed 'by itself'
* in case this is live, we might be ahead or before playback, where
* segments don't exist (are still being created or were already deleted)
* so we either wait or jump ahead */
if (gst_mpd_client_is_live (demux->client)) {
gint64 time_diff;
gint pos;
pos =
gst_mpd_client_check_time_position (demux->client,
stream->active_stream, fragment_ts, &time_diff);
GST_DEBUG_OBJECT (stream->pad,
"Checked position for fragment ts %" GST_TIME_FORMAT
", res: %d, diff: %" G_GINT64_FORMAT, GST_TIME_ARGS (fragment_ts),
pos, time_diff);
time_diff *= GST_USECOND;
if (pos < 0) {
/* we're behind, try moving to the 'present' */
GDateTime *now = g_date_time_new_now_utc ();
GST_DEBUG_OBJECT (stream->pad,
"Falling behind live stream, moving forward");
gst_mpd_client_seek_to_time (demux->client, now);
g_date_time_unref (now);
} else if (pos > 0) {
/* we're ahead, wait a little */
GST_DEBUG_OBJECT (stream->pad,
"Waiting for next segment to be created");
gst_mpd_client_set_segment_index (stream->active_stream,
stream->active_stream->segment_idx - 1);
gst_dash_demux_download_wait (stream, time_diff);
} else {
gst_mpd_client_set_segment_index (stream->active_stream,
stream->active_stream->segment_idx - 1);
demux->client->update_failed_count++;
}
} else {
demux->client->update_failed_count++;
}
if (demux->client->update_failed_count < DEFAULT_FAILED_COUNT) {
GST_WARNING_OBJECT (stream->pad, "Could not fetch the next fragment");
goto quit;
} else {
goto error_downloading;
}
break;
default:
break;
}
if (G_LIKELY (stream->last_ret != GST_FLOW_ERROR))
demux->client->update_failed_count = 0;
quit:
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
if (G_UNLIKELY (stream->last_ret == GST_FLOW_EOS)) {
gst_pad_push_event (stream->pad, gst_event_new_eos ());
}
GST_DEBUG_OBJECT (stream->pad, "Finishing download loop");
return;
cancelled:
{
GST_WARNING_OBJECT (stream->pad, "Cancelled, leaving download task");
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
return;
}
end_of_manifest:
{
GST_INFO_OBJECT (stream->pad, "End of manifest, leaving download task");
gst_task_stop (stream->download_task);
/* TODO should push eos? */
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
return;
}
error_downloading:
{
GST_ELEMENT_ERROR (demux, RESOURCE, NOT_FOUND,
("Could not fetch the next fragment, leaving download task"), (NULL));
gst_task_stop (stream->download_task);
GST_DASH_DEMUX_CLIENT_UNLOCK (demux);
return;
}
}
static void
gst_dash_demux_resume_download_task (GstDashDemux * demux)
{
GSList *iter;
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
GstDashDemuxStream *stream = iter->data;
gst_task_start (stream->download_task);
}
}
/*
* gst_dash_demux_stream_select_representation_unlocked:
*
* Select the most appropriate media representation based on current target
* bitrate.
*/
static GstEvent *
gst_dash_demux_stream_select_representation_unlocked (GstDashDemuxStream *
stream)
{
GstActiveStream *active_stream = NULL;
GList *rep_list = NULL;
gint new_index;
GstDashDemux *demux = stream->demux;
guint64 bitrate;
active_stream = stream->active_stream;
if (active_stream == NULL)
return FALSE;
/* retrieve representation list */
if (active_stream->cur_adapt_set)
rep_list = active_stream->cur_adapt_set->Representations;
if (!rep_list)
return FALSE;
bitrate =
gst_download_rate_get_current_rate (&stream->dnl_rate) *
demux->bandwidth_usage;
GST_DEBUG_OBJECT (demux, "Trying to change to bitrate: %" G_GUINT64_FORMAT,
bitrate);
/* get representation index with current max_bandwidth */
new_index = gst_mpdparser_get_rep_idx_with_max_bandwidth (rep_list, bitrate);
/* 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",
stream->index, new_index, rep->bandwidth);
if (gst_mpd_client_setup_representation (demux->client, active_stream, rep)) {
stream->need_header = TRUE;
GST_INFO_OBJECT (demux, "Switching bitrate to %d",
active_stream->cur_representation->bandwidth);
gst_caps_unref (stream->input_caps);
stream->input_caps = gst_dash_demux_get_input_caps (demux, active_stream);
return gst_event_new_caps (gst_caps_ref (stream->input_caps));
} else {
GST_WARNING_OBJECT (demux, "Can not switch representation, aborting...");
return NULL;
}
}
return NULL;
}
static GstBuffer *
gst_dash_demux_download_header_fragment (GstDashDemux * demux,
GstDashDemuxStream * stream, gchar * path, gint64 range_start,
gint64 range_end)
{
GstBuffer *buffer = NULL;
gchar *next_header_uri;
GstFragment *fragment;
if (strncmp (path, "http://", 7) != 0) {
next_header_uri =
g_strconcat (gst_mpdparser_get_baseURL (demux->client, stream->index),
path, NULL);
g_free (path);
} else {
next_header_uri = path;
}
fragment = gst_uri_downloader_fetch_uri_with_range (stream->downloader,
next_header_uri, FALSE, range_start, range_end, NULL);
g_free (next_header_uri);
if (fragment) {
buffer = gst_fragment_get_buffer (fragment);
g_object_unref (fragment);
}
return buffer;
}
static GstBuffer *
gst_dash_demux_get_next_header (GstDashDemux * demux,
GstDashDemuxStream * stream)
{
gchar *initializationURL;
GstBuffer *header_buffer, *index_buffer = NULL;
gint64 range_start, range_end;
if (!gst_mpd_client_get_next_header (demux->client, &initializationURL,
stream->index, &range_start, &range_end))
return NULL;
GST_INFO_OBJECT (demux, "Fetching header %s %" G_GINT64_FORMAT "-%"
G_GINT64_FORMAT, initializationURL, range_start, range_end);
header_buffer = gst_dash_demux_download_header_fragment (demux, stream,
initializationURL, range_start, range_end);
/* check if we have an index */
if (header_buffer
&& gst_mpd_client_get_next_header_index (demux->client,
&initializationURL, stream->index, &range_start, &range_end)) {
GST_INFO_OBJECT (demux,
"Fetching index %s %" G_GINT64_FORMAT "-%" G_GINT64_FORMAT,
initializationURL, range_start, range_end);
index_buffer =
gst_dash_demux_download_header_fragment (demux, stream,
initializationURL, range_start, range_end);
}
if (header_buffer == NULL) {
GST_WARNING_OBJECT (demux, "Unable to fetch header");
return NULL;
}
if (index_buffer) {
header_buffer = gst_buffer_append (header_buffer, index_buffer);
}
return header_buffer;
}
static GstCaps *
gst_dash_demux_get_video_input_caps (GstDashDemux * demux,
GstActiveStream * stream)
{
guint width = 0, height = 0;
const gchar *mimeType = NULL;
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);
}
mimeType = gst_mpd_client_get_stream_mimeType (stream);
if (mimeType == NULL)
return NULL;
caps = gst_caps_from_string (mimeType);
if (width > 0 && height > 0) {
gst_caps_set_simple (caps, "width", G_TYPE_INT, width, "height",
G_TYPE_INT, height, NULL);
}
return caps;
}
static GstCaps *
gst_dash_demux_get_audio_input_caps (GstDashDemux * demux,
GstActiveStream * stream)
{
guint rate = 0, channels = 0;
const gchar *mimeType;
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);
}
mimeType = gst_mpd_client_get_stream_mimeType (stream);
if (mimeType == NULL)
return NULL;
caps = gst_caps_from_string (mimeType);
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)
{
const gchar *mimeType;
GstCaps *caps = NULL;
if (stream == NULL)
return NULL;
mimeType = gst_mpd_client_get_stream_mimeType (stream);
if (mimeType == NULL)
return NULL;
caps = gst_caps_from_string (mimeType);
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_wait_for_fragment_to_be_available (GstDashDemux * demux,
GstDashDemuxStream * stream)
{
GstDateTime *seg_end_time;
GstDateTime *cur_time = gst_date_time_new_now_utc ();
GstActiveStream *active_stream = stream->active_stream;
seg_end_time =
gst_mpd_client_get_next_segment_availability_end_time (demux->client,
active_stream);
if (seg_end_time) {
gint64 diff;
cur_time = gst_date_time_new_now_utc ();
diff = gst_mpd_client_calculate_time_difference (cur_time, seg_end_time);
gst_date_time_unref (seg_end_time);
gst_date_time_unref (cur_time);
if (diff > 0) {
GST_DEBUG_OBJECT (demux,
"Selected fragment has end timestamp > now (%" PRIi64
"), delaying download", diff);
gst_dash_demux_download_wait (stream, diff);
}
}
}
static GstBuffer *
gst_dash_demux_stream_download_fragment (GstDashDemux * demux,
GstDashDemuxStream * stream, guint64 * size_buffer,
GstClockTime * download_time)
{
GstActiveStream *active_stream;
GstFragment *download;
GTimeVal now;
GTimeVal start;
guint stream_idx = stream->index;
GstBuffer *buffer = NULL;
GstBuffer *header_buffer;
GstMediaFragmentInfo fragment;
if (G_UNLIKELY (stream->restart_download)) {
GstClockTime cur, ts;
gint64 pos;
GstEvent *gap;
GST_DEBUG_OBJECT (stream->pad,
"Reactivating stream after to reconfigure event");
cur = GST_CLOCK_TIME_IS_VALID (stream->position) ? stream->position : 0;
if (gst_pad_peer_query_position (stream->pad, GST_FORMAT_TIME, &pos)) {
ts = (GstClockTime) pos;
GST_DEBUG_OBJECT (stream->pad, "Downstream position: %"
GST_TIME_FORMAT, GST_TIME_ARGS (ts));
} else {
ts = demux->segment.position;
GST_DEBUG_OBJECT (stream->pad, "Downstream position query failed, "
"failling back to looking at other pads");
}
GST_DEBUG_OBJECT (stream->pad, "Restarting stream at "
"position %" GST_TIME_FORMAT ", current catch up %" GST_TIME_FORMAT,
GST_TIME_ARGS (ts), GST_TIME_ARGS (demux->segment.position));
if (GST_CLOCK_TIME_IS_VALID (ts)) {
gst_mpd_client_stream_seek (demux->client, stream->active_stream, ts);
if (cur < ts) {
gap = gst_event_new_gap (cur, ts - cur);
gst_pad_push_event (stream->pad, gap);
}
}
/* This stream might be entering into catching up mode,
* meaning that it will push buffers from this same download thread
* until it reaches 'catch_up_timestamp'.
*
* The reason for this is that in case of stream switching, the other
* stream that was previously active might be blocking the stream_loop
* in case it is ahead enough that all queues are filled.
* In this case, it is possible that a downstream input-selector is
* blocking waiting for the currently active stream to reach the
* same position of the old linked stream because of the 'sync-streams'
* behavior.
*
* We can push from this thread up to 'catch_up_timestamp' as all other
* streams should be around the same timestamp.
*/
stream->last_ret = GST_FLOW_CUSTOM_SUCCESS;
stream->restart_download = FALSE;
}
if (gst_mpd_client_get_next_fragment (demux->client, stream_idx, &fragment)) {
g_get_current_time (&start);
GST_INFO_OBJECT (stream->pad,
"Fetching next fragment %s ts:%" GST_TIME_FORMAT " dur:%"
GST_TIME_FORMAT " Range:%" G_GINT64_FORMAT "-%" G_GINT64_FORMAT,
fragment.uri, GST_TIME_ARGS (fragment.timestamp),
GST_TIME_ARGS (fragment.duration),
fragment.range_start, fragment.range_end);
download = gst_uri_downloader_fetch_uri_with_range (stream->downloader,
fragment.uri, FALSE, fragment.range_start, fragment.range_end, NULL);
if (download == NULL) {
gst_media_fragment_info_clear (&fragment);
return NULL;
}
active_stream = stream->active_stream;
if (active_stream == NULL) {
gst_media_fragment_info_clear (&fragment);
g_object_unref (download);
return NULL;
}
buffer = gst_fragment_get_buffer (download);
g_object_unref (download);
/* it is possible to have an index per fragment, so check and download */
if (fragment.index_uri || fragment.index_range_start
|| fragment.index_range_end != -1) {
const gchar *uri = fragment.index_uri;
GstBuffer *index_buffer;
if (!uri) /* fallback to default media uri */
uri = fragment.uri;
GST_DEBUG_OBJECT (stream->pad,
"Fragment index download: %s %" G_GINT64_FORMAT "-%"
G_GINT64_FORMAT, uri, fragment.index_range_start,
fragment.index_range_end);
download =
gst_uri_downloader_fetch_uri_with_range (stream->downloader, uri,
FALSE, fragment.index_range_start, fragment.index_range_end, NULL);
if (download) {
index_buffer = gst_fragment_get_buffer (download);
if (index_buffer)
buffer = gst_buffer_append (index_buffer, buffer);
g_object_unref (download);
}
}
if (stream->need_header) {
/* We need to fetch a new header */
if ((header_buffer =
gst_dash_demux_get_next_header (demux, stream)) != NULL) {
buffer = gst_buffer_append (header_buffer, buffer);
}
stream->need_header = FALSE;
}
g_get_current_time (&now);
*download_time = (GST_TIMEVAL_TO_TIME (now) - GST_TIMEVAL_TO_TIME (start));
buffer = gst_buffer_make_writable (buffer);
GST_BUFFER_TIMESTAMP (buffer) = fragment.timestamp;
GST_BUFFER_DURATION (buffer) = fragment.duration;
GST_BUFFER_OFFSET (buffer) =
gst_mpd_client_get_segment_index (active_stream) - 1;
gst_media_fragment_info_clear (&fragment);
*size_buffer += gst_buffer_get_size (buffer);
} else {
GST_WARNING_OBJECT (demux, "Failed to download fragment for stream %p %d",
stream, stream->index);
}
return buffer;
}
/* gst_dash_demux_stream_get_next_fragment:
*
* Get the next fragments for the stream with the earlier timestamp.
* It returns the selected timestamp so the caller can deal with
* sync issues in case the stream is live.
*
* This function uses the generic URI downloader API.
*
* Returns FALSE if an error occured while downloading fragments
*/
static GstFlowReturn
gst_dash_demux_stream_get_next_fragment (GstDashDemuxStream * stream,
GstClockTime * ts)
{
guint64 buffer_size = 0;
GstClockTime diff;
gboolean end_of_period = TRUE;
GstBuffer *buffer = NULL;
GstFlowReturn ret = GST_FLOW_OK;
GstDashDemux *demux = stream->demux;
if (stream->stream_eos)
return GST_FLOW_EOS;
if (stream->last_ret == GST_FLOW_NOT_LINKED) {
GST_LOG_OBJECT (demux, "Skipping stream %p %s:%s : not-linked",
stream, GST_DEBUG_PAD_NAME (stream->pad));
return GST_FLOW_NOT_LINKED;
}
if (!gst_mpd_client_get_next_fragment_timestamp (demux->client,
stream->index, ts)) {
GST_INFO_OBJECT (demux,
"This Period doesn't contain more fragments for stream %u",
stream->index);
/* check if this is live and we should wait for more data */
if (gst_mpd_client_is_live (demux->client)
&& demux->client->mpd_node->minimumUpdatePeriod != -1) {
end_of_period = FALSE;
return GST_FLOW_OK; /* TODO wait */
}
return GST_FLOW_EOS;
}
/*
* If this is a live stream, check the segment end time to make sure
* it is available to download
*/
if (gst_mpd_client_is_live (demux->client) &&
demux->client->mpd_node->minimumUpdatePeriod != -1) {
gst_dash_demux_wait_for_fragment_to_be_available (demux, stream);
}
/* Get the fragment corresponding to each stream index */
buffer =
gst_dash_demux_stream_download_fragment (demux, stream,
&buffer_size, &diff);
end_of_period = FALSE;
demux->end_of_period = end_of_period;
if (buffer) {
ret = gst_dash_demux_push (stream, buffer);
} else {
GST_WARNING_OBJECT (stream->pad, "Failed to download fragment");
return GST_FLOW_ERROR;
}
if (end_of_period)
return GST_FLOW_EOS;
if (stream && buffer_size > 0 && diff > 0) {
#ifndef GST_DISABLE_GST_DEBUG
guint64 brate;
#endif
gst_download_rate_add_rate (&stream->dnl_rate, buffer_size, diff);
#ifndef GST_DISABLE_GST_DEBUG
brate = (buffer_size * 8) / ((double) diff / GST_SECOND);
#endif
GST_INFO_OBJECT (demux,
"Stream: %d Download rate = %" G_GUINT64_FORMAT " Kbits/s (%"
G_GUINT64_FORMAT " Ko in %.2f s)", stream->index, brate / 1000,
buffer_size / 1024, ((double) diff / GST_SECOND));
}
return ret;
}
static void
gst_dash_demux_download_wait (GstDashDemuxStream * stream,
GstClockTime time_diff)
{
gint64 end_time = g_get_monotonic_time () + time_diff / GST_USECOND;
GST_DEBUG_OBJECT (stream->pad, "Download waiting for %" GST_TIME_FORMAT,
GST_TIME_ARGS (time_diff));
g_cond_wait_until (&stream->download_cond, &stream->download_mutex, end_time);
GST_DEBUG_OBJECT (stream->pad, "Download finished waiting");
}
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