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gstreamer/ext/dash/gstdashdemux.c
Thiago Santos 24815a5feb dashdemux: return the error to the source immediately to stop faster 
When flushing, this will prevent dashdemux from trying to download more
fragments or more chunks of the same fragment before stopping.

Also improves the error handling to not transform everything non-ok into
an error.

https://bugzilla.gnome.org/show_bug.cgi?id=734014
2014-08-01 10:37:15 -03:00

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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 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 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);
/* GstBin */
static void gst_dash_demux_handle_message (GstBin * bin, GstMessage * msg);
/* 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_stream_download_uri (GstDashDemux * demux,
GstDashDemuxStream * stream, const gchar * uri, gint64 start, gint64 end);
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,
GstDashDemuxStream * stream);
#define gst_dash_demux_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstDashDemux, gst_dash_demux, GST_TYPE_BIN,
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;
GstBinClass *gstbin_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbin_class = (GstBinClass *) 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"
"(deprecated)",
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/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>");
gstbin_class->handle_message = gst_dash_demux_handle_message;
}
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 void
gst_dash_demux_handle_message (GstBin * bin, GstMessage * msg)
{
GstDashDemux *demux = GST_DASH_DEMUX_CAST (bin);
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ERROR:{
GSList *iter;
GstDashDemuxStream *stream;
GError *err = NULL;
gchar *debug = NULL;
for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
stream = iter->data;
if (GST_OBJECT_CAST (stream->src) == GST_MESSAGE_SRC (msg)) {
gst_message_parse_error (msg, &err, &debug);
GST_WARNING_OBJECT (stream->pad, "Source posted error: %d:%d %s (%s)",
err->domain, err->code, err->message, debug);
/* error, but ask to retry */
stream->last_ret = GST_FLOW_CUSTOM_ERROR;
g_cond_signal (&stream->fragment_download_cond);
g_error_free (err);
g_free (debug);
break;
}
}
gst_message_unref (msg);
msg = NULL;
}
break;
default:
break;
}
if (msg)
GST_BIN_CLASS (parent_class)->handle_message (bin, msg);
}
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;
}
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;
case GST_EVENT_LATENCY:{
/* Upstream and our internal source are irrelevant
* for latency, and we should not fail here to
* configure the latency */
gst_event_unref (event);
return TRUE;
}
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->download_total_time = 0;
stream->download_total_bytes = 0;
stream->index = i;
stream->input_caps = caps;
stream->need_header = TRUE;
g_cond_init (&stream->fragment_download_cond);
g_mutex_init (&stream->fragment_download_lock);
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);
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) {
gchar *uri, *redirect_uri;
gboolean permanent;
gst_query_parse_uri (query, &uri);
gst_query_parse_uri_redirection (query, &redirect_uri);
gst_query_parse_uri_redirection_permanent (query, &permanent);
if (permanent && redirect_uri) {
demux->client->mpd_uri = redirect_uri;
demux->client->mpd_base_uri = NULL;
g_free (uri);
} else {
demux->client->mpd_uri = uri;
demux->client->mpd_base_uri = redirect_uri;
}
GST_DEBUG_OBJECT (demux, "Fetched MPD file at URI: %s (base: %s)",
demux->client->mpd_uri, GST_STR_NULL (demux->client->mpd_base_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);
gst_element_set_state (stream->src, GST_STATE_NULL);
}
}
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_element_set_state (stream->src, GST_STATE_READY);
g_cond_signal (&stream->fragment_download_cond);
}
}
static GstPad *
gst_dash_demux_create_pad (GstDashDemux * demux, GstDashDemuxStream * stream)
{
GstPad *pad;
GstPadTemplate *tmpl;
tmpl = gst_static_pad_template_get (&srctemplate);
/* Create and activate new pads */
pad = gst_ghost_pad_new_no_target_from_template (NULL, tmpl);
gst_object_unref (tmpl);
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, stream);
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 void
gst_dash_demux_stream_free (GstDashDemuxStream * stream)
{
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->src_srcpad) {
gst_object_unref (stream->src_srcpad);
stream->src_srcpad = NULL;
}
if (stream->src) {
gst_element_set_state (stream->src, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (stream->demux), stream->src);
stream->src = NULL;
}
g_cond_clear (&stream->fragment_download_cond);
g_mutex_clear (&stream->fragment_download_lock);
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, NULL, TRUE, TRUE, 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 ();
if (download->redirect_permanent && download->redirect_uri) {
new_client->mpd_uri = g_strdup (download->redirect_uri);
new_client->mpd_base_uri = NULL;
} else {
new_client->mpd_uri = g_strdup (download->uri);
new_client->mpd_base_uri = g_strdup (download->redirect_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 = 0;
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;
/* compare the time when the fragment was downloaded with the time when it was
* scheduled */
if (stream->download_total_time)
bitrate =
(stream->download_total_bytes * 8) /
((double) stream->download_total_time / G_GUINT64_CONSTANT (1000000));
GST_DEBUG_OBJECT (stream->pad,
"Downloaded %u bytes in %" GST_TIME_FORMAT ". Bitrate is : %d",
(guint) stream->download_total_bytes,
GST_TIME_ARGS (stream->download_total_time * GST_USECOND),
(gint) bitrate);
/* Take old rate into account too */
if (stream->current_download_rate != -1)
bitrate = (stream->current_download_rate + bitrate * 3) / 4;
if (bitrate > G_MAXINT)
bitrate = G_MAXINT;
stream->current_download_rate = bitrate;
bitrate *= demux->bandwidth_usage;
GST_DEBUG_OBJECT (stream->pad,
"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 void
gst_dash_demux_download_header_fragment (GstDashDemux * demux,
GstDashDemuxStream * stream, gchar * path, gint64 range_start,
gint64 range_end)
{
gchar *next_header_uri;
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;
}
gst_dash_demux_stream_download_uri (demux, stream, next_header_uri,
range_start, range_end);
g_free (next_header_uri);
}
static void
gst_dash_demux_get_next_header (GstDashDemux * demux,
GstDashDemuxStream * stream)
{
gchar *initializationURL;
gint64 range_start, range_end;
if (!gst_mpd_client_get_next_header (demux->client, &initializationURL,
stream->index, &range_start, &range_end))
return;
GST_INFO_OBJECT (demux, "Fetching header %s %" G_GINT64_FORMAT "-%"
G_GINT64_FORMAT, initializationURL, range_start, range_end);
gst_dash_demux_download_header_fragment (demux, stream,
initializationURL, range_start, range_end);
/* check if we have an index */
if (!demux->cancelled && stream->last_ret == GST_FLOW_OK /* TODO check for other valid types */
&& 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);
gst_dash_demux_download_header_fragment (demux, stream,
initializationURL, range_start, range_end);
}
}
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;
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;
GstDateTime *cur_time;
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 (%" G_GINT64_FORMAT
"), delaying download", diff);
gst_dash_demux_download_wait (stream, diff);
}
}
}
static GstFlowReturn
_src_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstPad *srcpad = (GstPad *) parent;
GstDashDemux *demux = (GstDashDemux *) GST_PAD_PARENT (srcpad);
GstDashDemuxStream *stream = gst_pad_get_element_private (srcpad);
GstFlowReturn ret;
gboolean discont = FALSE;
if (stream->starting_fragment) {
if (demux->segment.rate < 0)
/* Set DISCONT flag for every first buffer in reverse playback mode
* as each fragment for its own has to be reversed */
discont = TRUE;
stream->starting_fragment = FALSE;
GST_LOG_OBJECT (stream->pad, "set fragment pts=%" GST_TIME_FORMAT,
GST_TIME_ARGS (stream->current_fragment.timestamp));
GST_BUFFER_PTS (buffer) = stream->current_fragment.timestamp;
if (stream->pending_segment) {
if (demux->timestamp_offset == -1)
demux->timestamp_offset = GST_BUFFER_PTS (buffer);
else
demux->timestamp_offset =
MIN (GST_BUFFER_PTS (buffer), 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 */
GST_BUFFER_PTS (buffer) -= demux->timestamp_offset;
stream->position = demux->segment.position = GST_BUFFER_PTS (buffer);
} else {
GST_BUFFER_PTS (buffer) = GST_CLOCK_TIME_NONE;
}
if (discont) {
GST_DEBUG_OBJECT (stream->pad, "Marking fragment as discontinuous");
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
} else {
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
}
GST_BUFFER_DURATION (buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_OFFSET (buffer) =
gst_mpd_client_get_segment_index (stream->active_stream) - 1;
/* accumulate time and size to get this chunk */
stream->download_total_time +=
g_get_monotonic_time () - stream->download_start_time;
stream->download_total_bytes += gst_buffer_get_size (buffer);
ret = gst_proxy_pad_chain_default (pad, parent, buffer);
stream->download_start_time = g_get_monotonic_time ();
GST_LOG_OBJECT (pad, "Chain res: %d %s", ret, gst_flow_get_name (ret));
if (ret != GST_FLOW_OK) {
if (ret < GST_FLOW_EOS) {
GST_ELEMENT_ERROR (demux, STREAM, FAILED, (NULL),
("stream stopped, reason %s", gst_flow_get_name (ret)));
/* TODO push this on all pads */
gst_pad_push_event (stream->pad, gst_event_new_eos ());
} else {
GST_DEBUG_OBJECT (stream->pad, "stream stopped, reason %s",
gst_flow_get_name (ret));
}
/* TODO properly stop tasks */
/* gst_hls_demux_pause_tasks (demux); */
g_cond_signal (&stream->fragment_download_cond);
}
stream->last_ret = ret;
return ret;
}
static gboolean
_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstPad *srcpad = GST_PAD_CAST (parent);
GstDashDemuxStream *stream = gst_pad_get_element_private (srcpad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
g_cond_signal (&stream->fragment_download_cond);
break;
default:
break;
}
gst_event_unref (event);
return TRUE;
}
static gboolean
_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_ALLOCATION:
return FALSE;
break;
default:
break;
}
return gst_pad_query_default (pad, parent, query);
}
static gboolean
gst_dash_demux_stream_update_source (GstDashDemuxStream * stream,
const gchar * uri, const gchar * referer, gboolean refresh,
gboolean allow_cache)
{
GstDashDemux *demux = stream->demux;
if (!gst_uri_is_valid (uri)) {
GST_WARNING_OBJECT (stream->pad, "Invalid URI: %s", uri);
stream->last_ret = GST_FLOW_ERROR;
return FALSE;
}
if (stream->src != NULL) {
gchar *old_protocol, *new_protocol;
gchar *old_uri;
old_uri = gst_uri_handler_get_uri (GST_URI_HANDLER (stream->src));
old_protocol = gst_uri_get_protocol (old_uri);
new_protocol = gst_uri_get_protocol (uri);
if (!g_str_equal (old_protocol, new_protocol)) {
gst_object_unref (stream->src_srcpad);
gst_element_set_state (stream->src, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (demux), stream->src);
stream->src = NULL;
stream->src_srcpad = NULL;
GST_DEBUG_OBJECT (demux, "Can't re-use old source element");
} else {
GError *err = NULL;
GST_DEBUG_OBJECT (demux, "Re-using old source element");
if (!gst_uri_handler_set_uri (GST_URI_HANDLER (stream->src), uri, &err)) {
GST_DEBUG_OBJECT (demux, "Failed to re-use old source element: %s",
err->message);
g_clear_error (&err);
gst_element_set_state (stream->src, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (demux), stream->src);
stream->src = NULL;
}
}
g_free (old_uri);
g_free (old_protocol);
g_free (new_protocol);
}
if (stream->src == NULL) {
GObjectClass *gobject_class;
GstPad *internal_pad;
stream->src = gst_element_make_from_uri (GST_URI_SRC, uri, NULL, NULL);
if (stream->src == NULL) {
GST_ELEMENT_ERROR (demux, CORE, MISSING_PLUGIN,
("Missing plugin to handle URI: '%s'", uri), (NULL));
return FALSE;
}
gobject_class = G_OBJECT_GET_CLASS (stream->src);
if (g_object_class_find_property (gobject_class, "compress"))
g_object_set (stream->src, "compress", FALSE, NULL);
if (g_object_class_find_property (gobject_class, "keep-alive"))
g_object_set (stream->src, "keep-alive", TRUE, NULL);
if (g_object_class_find_property (gobject_class, "extra-headers")) {
if (referer || refresh || !allow_cache) {
GstStructure *extra_headers = gst_structure_new_empty ("headers");
if (referer)
gst_structure_set (extra_headers, "Referer", G_TYPE_STRING, referer,
NULL);
if (!allow_cache)
gst_structure_set (extra_headers, "Cache-Control", G_TYPE_STRING,
"no-cache", NULL);
else if (refresh)
gst_structure_set (extra_headers, "Cache-Control", G_TYPE_STRING,
"max-age=0", NULL);
g_object_set (stream->src, "extra-headers", extra_headers, NULL);
gst_structure_free (extra_headers);
} else {
g_object_set (stream->src, "extra-headers", NULL, NULL);
}
}
gst_element_set_locked_state (stream->src, TRUE);
gst_bin_add (GST_BIN_CAST (demux), stream->src);
stream->src_srcpad = gst_element_get_static_pad (stream->src, "src");
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (stream->pad),
stream->src_srcpad);
/* set up our internal pad to drop all events from
* the http src we don't care about. On the chain function
* we just push the buffer forward, but this way dash can get
* the flow return from downstream */
internal_pad =
GST_PAD_CAST (gst_proxy_pad_get_internal (GST_PROXY_PAD (stream->pad)));
gst_pad_set_chain_function (GST_PAD_CAST (internal_pad), _src_chain);
gst_pad_set_event_function (GST_PAD_CAST (internal_pad), _src_event);
/* need to set query otherwise deadlocks happen with allocation queries */
gst_pad_set_query_function (GST_PAD_CAST (internal_pad), _src_query);
gst_object_unref (internal_pad);
}
return TRUE;
}
/* must be called with the stream's fragment_download_lock */
static void
gst_dash_demux_stream_download_uri (GstDashDemux * demux,
GstDashDemuxStream * stream, const gchar * uri, gint64 start, gint64 end)
{
GST_DEBUG_OBJECT (stream->pad, "Downloading uri: %s, range:%" G_GINT64_FORMAT
" - %" G_GINT64_FORMAT, uri, start, end);
if (!gst_dash_demux_stream_update_source (stream, uri, NULL, FALSE, TRUE)) {
return;
}
if (gst_element_set_state (stream->src,
GST_STATE_READY) != GST_STATE_CHANGE_FAILURE) {
if (start != 0 || end != -1) {
if (!gst_element_send_event (stream->src, gst_event_new_seek (1.0,
GST_FORMAT_BYTES, (GstSeekFlags) GST_SEEK_FLAG_FLUSH,
GST_SEEK_TYPE_SET, start, GST_SEEK_TYPE_SET, end))) {
/* looks like the source can't handle seeks in READY */
/*
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_NOT_IMPLEMENTED,
"Source element can't handle range requests");
*/
stream->last_ret = GST_FLOW_ERROR;
}
}
if (G_LIKELY (stream->last_ret == GST_FLOW_OK)) {
/* flush the proxypads so that the EOS state is reset */
gst_pad_push_event (stream->src_srcpad, gst_event_new_flush_start ());
gst_pad_push_event (stream->src_srcpad, gst_event_new_flush_stop (TRUE));
stream->download_start_time = g_get_monotonic_time ();
gst_element_sync_state_with_parent (stream->src);
/* wait for the fragment to be completely downloaded */
GST_DEBUG_OBJECT (stream->pad,
"Waiting for fragment download to finish: %s", uri);
g_cond_wait (&stream->fragment_download_cond,
&stream->fragment_download_lock);
}
} else {
stream->last_ret = GST_FLOW_CUSTOM_ERROR;
}
gst_element_set_state (stream->src, GST_STATE_READY);
}
static void
gst_dash_demux_stream_download_fragment (GstDashDemux * demux,
GstDashDemuxStream * stream)
{
GstActiveStream *active_stream;
guint stream_idx = stream->index;
GstMediaFragmentInfo *fragment = &stream->current_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, GST_TIME_ARGS (ts));
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);
}
}
stream->restart_download = FALSE;
}
g_mutex_lock (&stream->fragment_download_lock);
if (gst_mpd_client_get_next_fragment (demux->client, stream_idx, fragment)) {
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);
/* Reset last flow return */
stream->last_ret = GST_FLOW_OK;
stream->starting_fragment = TRUE;
if (stream->need_header) {
/* We need to fetch a new header */
gst_dash_demux_get_next_header (demux, stream);
stream->need_header = FALSE;
}
if (stream->last_ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (stream->pad, "Failed to download headers");
goto exit;
}
if (demux->cancelled)
goto exit;
/* 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;
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);
gst_dash_demux_stream_download_uri (demux, stream, uri,
fragment->index_range_start, fragment->index_range_end);
}
if (stream->last_ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (stream->pad, "Failed to download fragment headers");
goto exit;
}
if (demux->cancelled)
goto exit;
/* now get the real fragment */
gst_dash_demux_stream_download_uri (demux, stream, fragment->uri,
fragment->range_start, fragment->range_end);
if (stream->last_ret < GST_FLOW_EOS) {
gst_media_fragment_info_clear (fragment);
goto exit;
}
active_stream = stream->active_stream;
if (active_stream == NULL) {
gst_media_fragment_info_clear (fragment);
stream->last_ret = GST_FLOW_ERROR;
goto exit;
}
if (stream->last_ret == GST_FLOW_OK) {
stream->position += fragment->duration;
}
gst_media_fragment_info_clear (fragment);
} else {
GST_WARNING_OBJECT (demux, "Failed to download fragment for stream %p %d",
stream, stream->index);
}
exit:
g_mutex_unlock (&stream->fragment_download_lock);
if (stream->last_ret == GST_FLOW_OK)
gst_element_set_state (stream->src, GST_STATE_READY);
else
gst_element_set_state (stream->src, GST_STATE_NULL);
}
/* 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)
{
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) {
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 */
gst_dash_demux_stream_download_fragment (demux, stream);
demux->end_of_period = FALSE;
if (stream->last_ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (stream->pad, "Failed to download fragment: %s",
gst_flow_get_name (stream->last_ret));
}
return stream->last_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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