mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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98e4d90519
The initial goal was to support the case where we are paused watching a live
stream, and when we resume we can no longer resume from the previously
downloaded position. In that case we internally do a flushing seek back to the
"current live head position". This was also extended since to be able to
handle (utterly broken) servers when we can't really figure out where we are
anymore and therefore trigger that lost sync so we can try to get back on our
feet.
This does fix the issue... but results in spurious FLUSH_{START|STOP} events
being sent downstream. While that's fine for regular playback scenarios, it's a
bit of a wild scenario since a lot of pipelines/applications don't expect such
events when it wasn't triggered by downstream/application.
Fixes #3605
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7005>
260 lines
11 KiB
C
260 lines
11 KiB
C
/* GStreamer
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*
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* Copyright (C) 2014 Samsung Electronics. All rights reserved.
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* Author: Thiago Santos <thiagoss@osg.samsung.com>
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*
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* Copyright (C) 2021-2022 Centricular Ltd
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* Author: Edward Hervey <edward@centricular.com>
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* Author: Jan Schmidt <jan@centricular.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef _GST_ADAPTIVE_DEMUX_PRIVATE_H_
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#define _GST_ADAPTIVE_DEMUX_PRIVATE_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/gstflowcombiner.h>
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#include "gstadaptivedemux-types.h"
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#include "gstadaptivedemux.h"
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#include "gstadaptivedemuxutils.h"
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G_BEGIN_DECLS
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#define NUM_LOOKBACK_FRAGMENTS 3
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#define MAX_DOWNLOAD_ERROR_COUNT 3
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/* Internal, so not using GST_FLOW_CUSTOM_SUCCESS_N */
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#define GST_ADAPTIVE_DEMUX_FLOW_SWITCH (GST_FLOW_CUSTOM_SUCCESS_2 + 2)
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#define TRACKS_GET_LOCK(d) (&GST_ADAPTIVE_DEMUX_CAST(d)->priv->tracks_lock)
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#define TRACKS_LOCK(d) g_mutex_lock (TRACKS_GET_LOCK (d))
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#define TRACKS_UNLOCK(d) g_mutex_unlock (TRACKS_GET_LOCK (d))
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#define BUFFERING_GET_LOCK(d) (&GST_ADAPTIVE_DEMUX_CAST(d)->priv->buffering_lock)
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#define BUFFERING_LOCK(d) g_mutex_lock (BUFFERING_GET_LOCK (d))
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#define BUFFERING_UNLOCK(d) g_mutex_unlock (BUFFERING_GET_LOCK (d))
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#define GST_MANIFEST_GET_LOCK(d) (&(GST_ADAPTIVE_DEMUX_CAST(d)->priv->manifest_lock))
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#define GST_MANIFEST_LOCK(d) G_STMT_START { \
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GST_TRACE("Locking manifest from thread %p", g_thread_self()); \
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g_rec_mutex_lock (GST_MANIFEST_GET_LOCK (d)); \
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GST_TRACE("Locked manifest from thread %p", g_thread_self()); \
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} G_STMT_END
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#define GST_MANIFEST_UNLOCK(d) G_STMT_START { \
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GST_TRACE("Unlocking manifest from thread %p", g_thread_self()); \
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g_rec_mutex_unlock (GST_MANIFEST_GET_LOCK (d)); \
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} G_STMT_END
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#define GST_ADAPTIVE_DEMUX_GET_SCHEDULER(d) (GST_ADAPTIVE_DEMUX_CAST(d)->priv->scheduler_task)
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#define GST_ADAPTIVE_SCHEDULER_LOCK(d) gst_adaptive_demux_scheduler_lock(demux)
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#define GST_ADAPTIVE_SCHEDULER_UNLOCK(d) G_STMT_START { \
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GST_TRACE("Unlocking scheduler from thread %p", g_thread_self()); \
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gst_adaptive_demux_loop_unlock_and_unpause (GST_ADAPTIVE_DEMUX_GET_SCHEDULER (d)); \
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} G_STMT_END
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#define GST_ADAPTIVE_DEMUX_SEGMENT_GET_LOCK(d) (&GST_ADAPTIVE_DEMUX_CAST(d)->priv->segment_lock)
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#define GST_ADAPTIVE_DEMUX_SEGMENT_LOCK(d) g_mutex_lock (GST_ADAPTIVE_DEMUX_SEGMENT_GET_LOCK (d))
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#define GST_ADAPTIVE_DEMUX_SEGMENT_UNLOCK(d) g_mutex_unlock (GST_ADAPTIVE_DEMUX_SEGMENT_GET_LOCK (d))
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struct _GstAdaptiveDemuxPrivate
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{
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GstAdapter *input_adapter; /* protected by manifest_lock */
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gint have_manifest; /* MT safe */
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/* Adaptive scheduling and parsing task */
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GstAdaptiveDemuxLoop *scheduler_task;
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/* Callback / timer id for the next manifest update */
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guint manifest_updates_cb;
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gboolean manifest_updates_enabled;
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gboolean need_manual_manifest_update;
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/* Count of failed manifest updates */
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gint update_failed_count;
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guint32 segment_seqnum; /* protected by manifest_lock */
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/* main lock used to protect adaptive demux and all its streams.
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* It serializes the adaptive demux public API.
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*/
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GRecMutex manifest_lock;
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/* Duration, updated after manifest updates */
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GstClockTime duration;
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/* Set to TRUE if any stream is waiting on the manifest update */
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gboolean stream_waiting_for_manifest;
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/* Set to TRUE if streams can download fragment data. If FALSE,
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* they can load playlists / prepare for updata_fragment_info()
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*/
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gboolean streams_can_download_fragments;
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/* Protects demux and stream segment information
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* Needed because seeks can update segment information
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* without needing to stop tasks when they just want to
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* update the segment boundaries */
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GMutex segment_lock;
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GstClockTime qos_earliest_time;
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/* Protects all tracks and period content */
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GMutex tracks_lock;
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/* Used to notify addition to a waiting (i.e. previously empty) track */
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GCond tracks_add;
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/* TRUE if we are buffering */
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gboolean is_buffering;
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/* TRUE if percent changed and message should be posted */
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gboolean percent_changed;
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gint percent;
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/* Serialises buffering message posting to avoid out-of-order
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* posting */
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GMutex buffering_lock;
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/* Atomic */
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guint32 requested_selection_seqnum;
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/* Lock protecting all the following fields */
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GRecMutex output_lock;
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/* Output task */
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GstTask *output_task;
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/* List of enabled OutputSlot */
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GList *outputs;
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/* flow combiner of output slots */
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GstFlowCombiner *flowcombiner;
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/* protected by output_lock */
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gboolean flushing;
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/* Current output selection seqnum */
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guint32 current_selection_seqnum;
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/* Current output position (in running time) */
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GstClockTime global_output_position;
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/* NOTE: The two following variables are to handle lost-sync internal flushing
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* and transposing the base time */
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/* Initial output position (in running time) */
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GstClockTime initial_output_position;
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/* Offset to apply to outgoing segments (in running time) */
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GstClockTime base_offset;
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/* End of fields protected by output_lock */
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gint n_audio_streams, n_video_streams, n_subtitle_streams;
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/* Counter used for uniquely identifying periods */
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gint n_periods;
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/* Array of periods.
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*
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* Head is the period being outputted, or to be outputted first
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* Tail is where new streams get added */
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GQueue *periods;
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};
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static inline gboolean gst_adaptive_demux_scheduler_lock(GstAdaptiveDemux *d)
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{
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GST_TRACE("Locking scheduler from thread %p", g_thread_self());
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if (!gst_adaptive_demux_loop_pause_and_lock (GST_ADAPTIVE_DEMUX_GET_SCHEDULER (d)))
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return FALSE;
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GST_TRACE("Locked scheduler from thread %p", g_thread_self());
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return TRUE;
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}
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void demux_update_buffering_locked (GstAdaptiveDemux * demux);
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void demux_post_buffering_locked (GstAdaptiveDemux * demux);
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GstFlowReturn gst_adaptive_demux_update_manifest (GstAdaptiveDemux *demux);
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void gst_adaptive_demux2_stream_wants_manifest_update (GstAdaptiveDemux * demux);
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void gst_adaptive_demux2_stream_parse_error (GstAdaptiveDemux2Stream *stream, GError * err);
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GstClockTime gst_adaptive_demux2_stream_get_fragment_waiting_time (GstAdaptiveDemux2Stream * stream);
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GstClockTime gst_adaptive_demux2_stream_get_presentation_offset (GstAdaptiveDemux2Stream * stream);
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GstClockTime gst_adaptive_demux_get_period_start_time (GstAdaptiveDemux * demux);
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gboolean gst_adaptive_demux_is_live (GstAdaptiveDemux * demux);
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void gst_adaptive_demux2_stream_on_manifest_update (GstAdaptiveDemux2Stream * stream);
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void gst_adaptive_demux2_stream_on_output_space_available (GstAdaptiveDemux2Stream *stream);
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void gst_adaptive_demux2_stream_on_can_download_fragments(GstAdaptiveDemux2Stream *stream);
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gboolean gst_adaptive_demux2_stream_has_next_fragment (GstAdaptiveDemux2Stream * stream);
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GstFlowReturn gst_adaptive_demux2_stream_seek (GstAdaptiveDemux2Stream * stream,
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gboolean forward, GstSeekFlags flags,
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GstClockTimeDiff ts, GstClockTimeDiff * final_ts);
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gboolean gst_adaptive_demux_get_live_seek_range (GstAdaptiveDemux * demux,
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gint64 * range_start, gint64 * range_stop);
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gboolean gst_adaptive_demux2_stream_in_live_seek_range (GstAdaptiveDemux * demux,
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GstAdaptiveDemux2Stream * stream);
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gboolean gst_adaptive_demux2_stream_is_selected_locked (GstAdaptiveDemux2Stream *stream);
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gboolean gst_adaptive_demux2_stream_is_default_locked (GstAdaptiveDemux2Stream *stream);
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gboolean gst_adaptive_demux_has_next_period (GstAdaptiveDemux * demux);
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void gst_adaptive_demux_advance_period (GstAdaptiveDemux * demux);
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GstFlowReturn gst_adaptive_demux2_stream_update_fragment_info (GstAdaptiveDemux2Stream * stream);
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void gst_adaptive_demux2_stream_stop (GstAdaptiveDemux2Stream * stream);
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gboolean gst_adaptive_demux_handle_lost_sync (GstAdaptiveDemux * demux);
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typedef struct
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{
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GstMiniObject *item;
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gsize size;
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/* running time of item : GST_CLOCK_STIME_NONE for non-timed data */
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GstClockTimeDiff runningtime;
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/* GST_CLOCK_STIME_NONE for non-timed data */
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GstClockTimeDiff runningtime_end;
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/* running time of item for buffering tracking: GST_CLOCK_STIME_NONE for non-timed data */
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GstClockTimeDiff runningtime_buffering;
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} TrackQueueItem;
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GstMiniObject * gst_adaptive_demux_track_dequeue_data_locked (GstAdaptiveDemux * demux, GstAdaptiveDemuxTrack * track, gboolean check_sticky_events);
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void gst_adaptive_demux_track_flush (GstAdaptiveDemuxTrack * track);
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void gst_adaptive_demux_track_drain_to (GstAdaptiveDemuxTrack * track, GstClockTime drain_running_time);
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void gst_adaptive_demux_track_update_next_position (GstAdaptiveDemuxTrack * track);
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void gst_adaptive_demux_track_update_level_locked (GstAdaptiveDemuxTrack * track);
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/* Period functions */
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GstAdaptiveDemuxPeriod * gst_adaptive_demux_period_new (GstAdaptiveDemux * demux);
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GstAdaptiveDemuxPeriod * gst_adaptive_demux_period_ref (GstAdaptiveDemuxPeriod * period);
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void gst_adaptive_demux_period_unref (GstAdaptiveDemuxPeriod * period);
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gboolean gst_adaptive_demux_period_add_stream (GstAdaptiveDemuxPeriod * period,
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GstAdaptiveDemux2Stream * stream);
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gboolean gst_adaptive_demux_period_add_track (GstAdaptiveDemuxPeriod * period,
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GstAdaptiveDemuxTrack * track);
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gboolean gst_adaptive_demux_track_add_elements (GstAdaptiveDemuxTrack * track,
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guint period_num);
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void gst_adaptive_demux_period_select_default_tracks (GstAdaptiveDemux * demux,
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GstAdaptiveDemuxPeriod * period);
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void gst_adaptive_demux_period_transfer_selection (GstAdaptiveDemux * demux,
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GstAdaptiveDemuxPeriod * next_period,
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GstAdaptiveDemuxPeriod * current_period);
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void gst_adaptive_demux_period_stop_tasks (GstAdaptiveDemuxPeriod * period);
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GstFlowReturn gst_adaptive_demux_period_combine_stream_flows (GstAdaptiveDemuxPeriod * period);
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gboolean gst_adaptive_demux_period_has_pending_tracks (GstAdaptiveDemuxPeriod * period);
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void gst_adaptive_demux_period_check_input_wakeup_locked (GstAdaptiveDemuxPeriod * period, GstClockTimeDiff current_output_position);
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G_END_DECLS
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#endif
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