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cea909b877
Remove the dashdemux seeking function to use the one implemented in mpdparser as it is more complete. This also makes dashdemux not crash when seeking on streams that use segment templates.
2095 lines
66 KiB
C
2095 lines
66 KiB
C
/*
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* DASH demux plugin for GStreamer
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*
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* gstdashdemux.c
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*
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* Copyright (C) 2012 Orange
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*
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* Authors:
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* David Corvoysier <david.corvoysier@orange.com>
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* Hamid Zakari <hamid.zakari@gmail.com>
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*
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* Copyright (C) 2013 Smart TV Alliance
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* Author: Thiago Sousa Santos <thiago.sousa.santos@collabora.com>, Collabora Ltd.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library (COPYING); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-dashdemux
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*
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* DASH demuxer element.
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* <title>Example launch line</title>
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* |[
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* 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"
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* ]|
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*/
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/* Implementation notes:
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*
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* The following section describes how dashdemux works internally.
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*
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* Introduction:
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*
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* dashdemux is a "fake" demux, as unlike traditional demux elements, it
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* doesn't split data streams contained in an enveloppe to expose them
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* to downstream decoding elements.
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*
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* Instead, it parses an XML file called a manifest to identify a set of
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* individual stream fragments it needs to fetch and expose to the actual
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* demux elements that will handle them (this behavior is sometimes
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* referred as the "demux after a demux" scenario).
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*
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* For a given section of content, several representations corresponding
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* to different bitrates may be available: dashdemux will select the most
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* appropriate representation based on local conditions (typically the
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* available bandwidth and the amount of buffering available, capped by
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* a maximum allowed bitrate).
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*
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* The representation selection algorithm can be configured using
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* specific properties: max bitrate, min/max buffering, bandwidth ratio.
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*
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*
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* General Design:
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*
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* dashdemux has a single sink pad that accepts the data corresponding
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* to the manifest, typically fetched from an HTTP or file source.
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*
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* dashdemux exposes the streams it recreates based on the fragments it
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* fetches through dedicated src pads corresponding to the caps of the
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* fragments container (ISOBMFF/MP4 or MPEG2TS).
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*
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* During playback, new representations will typically be exposed as a
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* new set of pads (see 'Switching between representations' below).
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*
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* Fragments downloading is performed using a dedicated task that fills
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* an internal queue. Another task is in charge of popping fragments
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* from the queue and pushing them downstream.
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*
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* Switching between representations:
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*
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* Decodebin supports scenarios allowing to seamlessly switch from one
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* stream to another inside the same "decoding chain".
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*
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* To achieve that, it combines the elements it autoplugged in chains
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* and groups, allowing only one decoding group to be active at a given
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* time for a given chain.
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*
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* A chain can signal decodebin that it is complete by sending a
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* no-more-pads event, but even after that new pads can be added to
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* create new subgroups, providing that a new no-more-pads event is sent.
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*
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* We take advantage of that to dynamically create a new decoding group
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* in order to select a different representation during playback.
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*
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* Typically, assuming that each fragment contains both audio and video,
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* the following tree would be created:
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*
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* chain "DASH Demux"
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* |_ group "Representation set 1"
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* | |_ chain "Qt Demux 0"
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* | |_ group "Stream 0"
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* | |_ chain "H264"
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* | |_ chain "AAC"
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* |_ group "Representation set 2"
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* |_ chain "Qt Demux 1"
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* |_ group "Stream 1"
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* |_ chain "H264"
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* |_ chain "AAC"
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*
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* Or, if audio and video are contained in separate fragments:
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*
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* chain "DASH Demux"
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* |_ group "Representation set 1"
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* | |_ chain "Qt Demux 0"
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* | | |_ group "Stream 0"
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* | | |_ chain "H264"
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* | |_ chain "Qt Demux 1"
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* | |_ group "Stream 1"
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* | |_ chain "AAC"
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* |_ group "Representation set 2"
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* |_ chain "Qt Demux 3"
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* | |_ group "Stream 2"
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* | |_ chain "H264"
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* |_ chain "Qt Demux 4"
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* |_ group "Stream 3"
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* |_ chain "AAC"
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*
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* In both cases, when switching from Set 1 to Set 2 an EOS is sent on
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* each end pad corresponding to Rep 0, triggering the "drain" state to
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* propagate upstream.
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* Once both EOS have been processed, the "Set 1" group is completely
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* drained, and decodebin2 will switch to the "Set 2" group.
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*
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* Note: nothing can be pushed to the new decoding group before the
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* old one has been drained, which means that in order to be able to
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* adapt quickly to bandwidth changes, we will not be able to rely
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* on downstream buffering, and will instead manage an internal queue.
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*
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <string.h>
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#include <inttypes.h>
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#include <gst/base/gsttypefindhelper.h>
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#include "gst/gst-i18n-plugin.h"
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#include "gstdashdemux.h"
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#include "gstdash_debug.h"
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static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src_%u",
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GST_PAD_SRC,
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GST_PAD_SOMETIMES,
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GST_STATIC_CAPS_ANY);
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static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/dash+xml"));
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GST_DEBUG_CATEGORY (gst_dash_demux_debug);
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#define GST_CAT_DEFAULT gst_dash_demux_debug
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enum
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{
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PROP_0,
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PROP_MAX_BUFFERING_TIME,
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PROP_BANDWIDTH_USAGE,
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PROP_MAX_BITRATE,
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PROP_LAST
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};
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/* Default values for properties */
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#define DEFAULT_MAX_BUFFERING_TIME 30 /* in seconds */
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#define DEFAULT_BANDWIDTH_USAGE 0.8 /* 0 to 1 */
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#define DEFAULT_MAX_BITRATE 24000000 /* in bit/s */
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#define DEFAULT_FAILED_COUNT 3
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#define DOWNLOAD_RATE_HISTORY_MAX 3
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#define GST_DASH_DEMUX_CLIENT_LOCK(d) g_mutex_lock (&d->client_lock)
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#define GST_DASH_DEMUX_CLIENT_UNLOCK(d) g_mutex_unlock (&d->client_lock)
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/* GObject */
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static void gst_dash_demux_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_dash_demux_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_dash_demux_dispose (GObject * obj);
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/* GstElement */
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static GstStateChangeReturn
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gst_dash_demux_change_state (GstElement * element, GstStateChange transition);
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/* GstDashDemux */
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static GstFlowReturn gst_dash_demux_pad (GstPad * pad, GstObject * parent,
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GstBuffer * buf);
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static gboolean gst_dash_demux_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static gboolean gst_dash_demux_src_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static gboolean gst_dash_demux_src_query (GstPad * pad, GstObject * parent,
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GstQuery * query);
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static void gst_dash_demux_stream_download_loop (GstDashDemuxStream * stream);
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static void gst_dash_demux_stop (GstDashDemux * demux);
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static void gst_dash_demux_wait_stop (GstDashDemux * demux);
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static void gst_dash_demux_resume_download_task (GstDashDemux * demux);
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static gboolean gst_dash_demux_setup_all_streams (GstDashDemux * demux);
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static GstEvent
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* gst_dash_demux_stream_select_representation_unlocked (GstDashDemuxStream *
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stream);
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static GstFlowReturn gst_dash_demux_stream_get_next_fragment (GstDashDemuxStream
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* stream, GstClockTime * ts);
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static gboolean gst_dash_demux_advance_period (GstDashDemux * demux);
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static void gst_dash_demux_download_wait (GstDashDemuxStream * stream,
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GstClockTime time_diff);
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static void gst_dash_demux_expose_streams (GstDashDemux * demux);
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static void gst_dash_demux_remove_streams (GstDashDemux * demux,
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GSList * streams);
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static void gst_dash_demux_stream_free (GstDashDemuxStream * stream);
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static void gst_dash_demux_reset (GstDashDemux * demux, gboolean dispose);
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static GstCaps *gst_dash_demux_get_input_caps (GstDashDemux * demux,
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GstActiveStream * stream);
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static GstPad *gst_dash_demux_create_pad (GstDashDemux * demux);
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#define gst_dash_demux_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstDashDemux, gst_dash_demux, GST_TYPE_ELEMENT,
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GST_DEBUG_CATEGORY_INIT (gst_dash_demux_debug, "dashdemux", 0,
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"dashdemux element");
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);
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static void
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gst_dash_demux_dispose (GObject * obj)
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{
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GstDashDemux *demux = GST_DASH_DEMUX (obj);
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gst_dash_demux_reset (demux, TRUE);
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if (demux->downloader != NULL) {
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g_object_unref (demux->downloader);
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demux->downloader = NULL;
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}
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g_mutex_clear (&demux->client_lock);
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G_OBJECT_CLASS (parent_class)->dispose (obj);
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}
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static void
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gst_dash_demux_class_init (GstDashDemuxClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gobject_class->set_property = gst_dash_demux_set_property;
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gobject_class->get_property = gst_dash_demux_get_property;
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gobject_class->dispose = gst_dash_demux_dispose;
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g_object_class_install_property (gobject_class, PROP_MAX_BUFFERING_TIME,
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g_param_spec_uint ("max-buffering-time", "Maximum buffering time",
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"Maximum number of seconds of buffer accumulated during playback",
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2, G_MAXUINT, DEFAULT_MAX_BUFFERING_TIME,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_BANDWIDTH_USAGE,
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g_param_spec_float ("bandwidth-usage",
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"Bandwidth usage [0..1]",
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"Percentage of the available bandwidth to use when selecting representations",
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0, 1, DEFAULT_BANDWIDTH_USAGE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_MAX_BITRATE,
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g_param_spec_uint ("max-bitrate", "Max bitrate",
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"Max of bitrate supported by target decoder",
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1000, G_MAXUINT, DEFAULT_MAX_BITRATE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_dash_demux_change_state);
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&srctemplate));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&sinktemplate));
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gst_element_class_set_static_metadata (gstelement_class,
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"DASH Demuxer",
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"Codec/Demuxer",
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"Dynamic Adaptive Streaming over HTTP demuxer",
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"David Corvoysier <david.corvoysier@orange.com>\n\
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Hamid Zakari <hamid.zakari@gmail.com>\n\
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Gianluca Gennari <gennarone@gmail.com>");
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}
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static void
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gst_dash_demux_init (GstDashDemux * demux)
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{
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/* sink pad */
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demux->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
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gst_pad_set_chain_function (demux->sinkpad,
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GST_DEBUG_FUNCPTR (gst_dash_demux_pad));
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gst_pad_set_event_function (demux->sinkpad,
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GST_DEBUG_FUNCPTR (gst_dash_demux_sink_event));
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gst_element_add_pad (GST_ELEMENT (demux), demux->sinkpad);
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gst_segment_init (&demux->segment, GST_FORMAT_TIME);
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/* Downloader */
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demux->downloader = gst_uri_downloader_new ();
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/* Properties */
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demux->max_buffering_time = DEFAULT_MAX_BUFFERING_TIME * GST_SECOND;
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demux->bandwidth_usage = DEFAULT_BANDWIDTH_USAGE;
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demux->max_bitrate = DEFAULT_MAX_BITRATE;
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g_mutex_init (&demux->client_lock);
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}
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static void
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gst_dash_demux_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstDashDemux *demux = GST_DASH_DEMUX (object);
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switch (prop_id) {
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case PROP_MAX_BUFFERING_TIME:
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demux->max_buffering_time = g_value_get_uint (value) * GST_SECOND;
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break;
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case PROP_BANDWIDTH_USAGE:
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demux->bandwidth_usage = g_value_get_float (value);
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break;
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case PROP_MAX_BITRATE:
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demux->max_bitrate = g_value_get_uint (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_dash_demux_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstDashDemux *demux = GST_DASH_DEMUX (object);
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switch (prop_id) {
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case PROP_MAX_BUFFERING_TIME:
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g_value_set_uint (value, demux->max_buffering_time / GST_SECOND);
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break;
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case PROP_BANDWIDTH_USAGE:
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g_value_set_float (value, demux->bandwidth_usage);
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break;
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case PROP_MAX_BITRATE:
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g_value_set_uint (value, demux->max_bitrate);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstStateChangeReturn
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gst_dash_demux_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret;
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GstDashDemux *demux = GST_DASH_DEMUX (element);
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_dash_demux_reset (demux, FALSE);
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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break;
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default:
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break;
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}
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return ret;
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}
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static gboolean
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gst_dash_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstDashDemux *demux;
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demux = GST_DASH_DEMUX (parent);
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switch (event->type) {
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case GST_EVENT_SEEK:
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{
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gdouble rate;
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GstFormat format;
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GstSeekFlags flags;
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GstSeekType start_type, stop_type;
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gint64 start, stop;
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GList *list;
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GstClockTime current_pos, target_pos;
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guint current_period;
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GstStreamPeriod *period;
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GSList *iter;
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gboolean update;
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GST_INFO_OBJECT (demux, "Received seek event");
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if (gst_mpd_client_is_live (demux->client)) {
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GST_WARNING_OBJECT (demux, "Received seek event for live stream");
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return FALSE;
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}
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gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
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&stop_type, &stop);
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if (format != GST_FORMAT_TIME)
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return FALSE;
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GST_DEBUG_OBJECT (demux,
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"seek event, rate: %f type: %d start: %" GST_TIME_FORMAT " stop: %"
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GST_TIME_FORMAT, rate, start_type, GST_TIME_ARGS (start),
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GST_TIME_ARGS (stop));
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gst_segment_do_seek (&demux->segment, rate, format, flags, start_type,
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start, stop_type, stop, &update);
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if (update) {
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GstEvent *seg_evt;
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GST_DASH_DEMUX_CLIENT_LOCK (demux);
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if (flags & GST_SEEK_FLAG_FLUSH) {
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GST_DEBUG_OBJECT (demux, "sending flush start");
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for (iter = demux->streams; iter; iter = g_slist_next (iter)) {
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GstDashDemuxStream *stream;
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stream = iter->data;
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gst_pad_push_event (stream->pad, gst_event_new_flush_start ());
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}
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}
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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);
|
|
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, range_start, range_end);
|
|
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_MSECOND;
|
|
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, fragment.range_start, fragment.range_end);
|
|
|
|
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,
|
|
fragment.index_range_start, fragment.index_range_end);
|
|
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");
|
|
}
|