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Avoid a deadlock if a downstream seeking query happens while the scheduler thread is holding the manifest lock (for example during a seek back to live). Instead, do a more elaborate fix where the external calls that need access to a 'manifest' access a copy that's updated during a manually triggered manifest update callback. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3883>
255 lines
10 KiB
C
255 lines
10 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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GMutex api_lock;
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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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/* 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_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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