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During a live stream it is possible for dashdemux to lag behind on a slow connection or to rush ahead of the connection os too fast. For the first case it is necessary to jump some segments ahead to be able to continue playback as old segments are usually deleted from the server. For the later, dashdemux should wait a little before attempting another download do give time to the server to produce a new segment
152 lines
4.1 KiB
C
152 lines
4.1 KiB
C
/*
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* DASH demux plugin for GStreamer
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*
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* gstdashdemux.h
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*
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* Copyright (C) 2012 Orange
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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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#ifndef __GST_DASH_DEMUX_H__
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#define __GST_DASH_DEMUX_H__
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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#include <gst/base/gstdataqueue.h>
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#include "gstmpdparser.h"
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#include "gstdownloadrate.h"
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#include <gst/uridownloader/gsturidownloader.h>
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G_BEGIN_DECLS
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#define GST_TYPE_DASH_DEMUX \
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(gst_dash_demux_get_type())
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#define GST_DASH_DEMUX(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DASH_DEMUX,GstDashDemux))
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#define GST_DASH_DEMUX_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DASH_DEMUX,GstDashDemuxClass))
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#define GST_IS_DASH_DEMUX(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DASH_DEMUX))
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#define GST_IS_DASH_DEMUX_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DASH_DEMUX))
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typedef struct _GstDashDemuxStream GstDashDemuxStream;
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typedef struct _GstDashDemux GstDashDemux;
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typedef struct _GstDashDemuxClass GstDashDemuxClass;
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struct _GstDashDemuxStream
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{
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GstPad *pad;
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gint index;
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GstCaps *input_caps;
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/*
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* Need to store the status for the download and
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* stream tasks separately as they are working at
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* different points of the stream timeline.
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* The download task is ahead of the stream.
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*
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* The download_end_of_period is set when a stream
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* has already downloaded all fragments for the current
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* period.
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*
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* The stream_end_of_period is set when a stream
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* has pushed all fragments for the current period
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*/
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gboolean download_end_of_period;
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gboolean stream_end_of_period;
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gboolean stream_eos;
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gboolean need_header;
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/* tracks if a stream has enqueued data
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* after a pad switch.
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* This is required to prevent pads being
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* added to the demuxer and having no data
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* pushed to it before another pad switch
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* as this might make downstream elements
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* unhappy and error out if they get
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* an EOS without receiving any input
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*/
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gboolean has_data_queued;
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GstDataQueue *queue;
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GstDownloadRate dnl_rate;
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};
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/**
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* GstDashDemux:
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*
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* Opaque #GstDashDemux data structure.
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*/
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struct _GstDashDemux
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{
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GstElement parent;
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GstPad *sinkpad;
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GSList *streams;
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GSList *next_periods;
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GMutex streams_lock;
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GstSegment segment;
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gboolean need_segment;
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GstClockTime timestamp_offset;
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GstBuffer *manifest;
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GstUriDownloader *downloader;
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GstMpdClient *client; /* MPD client */
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gboolean end_of_period;
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gboolean end_of_manifest;
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/* Properties */
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GstClockTime max_buffering_time; /* Maximum buffering time accumulated during playback */
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gfloat bandwidth_usage; /* Percentage of the available bandwidth to use */
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guint64 max_bitrate; /* max of bitrate supported by target decoder */
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/* Streaming task */
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GstTask *stream_task;
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GRecMutex stream_task_lock;
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/* Download task */
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GstTask *download_task;
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GRecMutex download_task_lock;
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GMutex download_mutex;
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GCond download_cond;
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gboolean cancelled;
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/* Manifest update */
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GstClockTime last_manifest_update;
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};
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struct _GstDashDemuxClass
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{
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GstElementClass parent_class;
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};
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GType gst_dash_demux_get_type (void);
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G_END_DECLS
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#endif /* __GST_DASH_DEMUX_H__ */
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