2ce4f6a8e4
When a stream gets a not-linked return, it will be marked as so and won't download any more new fragments until a reconfigure event is received. This will make mssdemux expose all pads, but only download fragments for the streams that are actually being used. Relying on the pads being linked/unlinked isn't enough in this scenario as there might be an input-selector downstream that is actually discarding buffers for a given linked pad. When streams are switching, the old active stream can be blocked because input-selector will block not-linked streams. In case the mssdemux's stream loop is blocked pushing a buffer to a full queue downstream it will never unblock as the queue will not drain (input-selector is blocking). In this scenario, stream switching will deadlock as input-selector is waiting for the newly active stream data and the stream_loop that would push this data is blocked waiting for input-selector. To solve this issue, whenever an stream is reactivated on a reconfigure it will enter into the 'catch up mode', in this mode it can push buffers from its download thread until it reaches the currrent GstSegment's position. This works because this timestamp will always be behind or equal to the maximum timestamp pushed for all streams, after pushing data for this timestamp, the stream will go back to default and be pushed sequentially from the main streaming thread. By this time, the input-selector should have already released the thread. https://bugzilla.gnome.org/show_bug.cgi?id=711849
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/* GStreamer
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* Copyright (C) 2012 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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* gstmssdemux.h:
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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 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; 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_MSSDEMUX_H__
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#define __GST_MSSDEMUX_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 "gstmssmanifest.h"
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#include <gst/uridownloader/gsturidownloader.h>
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#include "gstdownloadrate.h"
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G_BEGIN_DECLS
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GST_DEBUG_CATEGORY_EXTERN (mssdemux_debug);
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#define GST_CAT_DEFAULT mssdemux_debug
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#define GST_TYPE_MSS_DEMUX \
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(gst_mss_demux_get_type())
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#define GST_MSS_DEMUX(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MSS_DEMUX,GstMssDemux))
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#define GST_MSS_DEMUX_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MSS_DEMUX,GstMssDemuxClass))
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#define GST_IS_MSS_DEMUX(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MSS_DEMUX))
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#define GST_IS_MSS_DEMUX_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MSS_DEMUX))
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#define GST_MSS_DEMUX_CAST(obj) ((GstMssDemux *)(obj))
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typedef struct _GstMssDemuxStream GstMssDemuxStream;
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typedef struct _GstMssDemux GstMssDemux;
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typedef struct _GstMssDemuxClass GstMssDemuxClass;
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#define GST_MSS_DEMUX_STREAM_LOCK(s) g_mutex_lock (&(s)->mutex)
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#define GST_MSS_DEMUX_STREAM_UNLOCK(s) g_mutex_unlock (&(s)->mutex)
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struct _GstMssDemuxStream {
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GstPad *pad;
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GMutex mutex;
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GstCaps *caps;
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GstMssDemux *parent;
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GstMssStream *manifest_stream;
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GstUriDownloader *downloader;
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GstDataQueue *dataqueue;
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GstEvent *pending_newsegment;
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GstClockTime next_timestamp;
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/* Downloading task */
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GstTask *download_task;
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GRecMutex download_lock;
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GstFlowReturn last_ret;
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gboolean eos;
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gboolean have_data;
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gboolean cancelled;
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gboolean restart_download;
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GstDownloadRate download_rate;
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guint download_error_count;
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};
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struct _GstMssDemux {
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GstElement element;
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/* pads */
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GstPad *sinkpad;
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gboolean have_group_id;
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guint group_id;
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GstBuffer *manifest_buffer;
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GstMssManifest *manifest;
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gchar *base_url;
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gchar *manifest_uri;
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GstSegment segment;
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GSList *streams;
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guint n_videos;
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guint n_audios;
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gboolean update_bitrates;
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/* Streaming task */
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GstTask *stream_task;
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GRecMutex stream_lock;
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/* properties */
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guint64 connection_speed; /* in bps */
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guint data_queue_max_size;
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gfloat bitrate_limit;
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};
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struct _GstMssDemuxClass {
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GstElementClass parent_class;
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};
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GType gst_mss_demux_get_type (void);
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G_END_DECLS
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#endif /* __GST_MSSDEMUX_H__ */
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