gstreamer/subprojects/gst-plugins-good/ext/adaptivedemux2/gstadaptivedemux-private.h
Jan Schmidt 3d0e8aa07e adaptivedemux2: Fix manifest access during seeking query
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>
2023-02-03 16:52:23 +00:00

255 lines
10 KiB
C

/* GStreamer
*
* Copyright (C) 2014 Samsung Electronics. All rights reserved.
* Author: Thiago Santos <thiagoss@osg.samsung.com>
*
* Copyright (C) 2021-2022 Centricular Ltd
* Author: Edward Hervey <edward@centricular.com>
* Author: Jan Schmidt <jan@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef _GST_ADAPTIVE_DEMUX_PRIVATE_H_
#define _GST_ADAPTIVE_DEMUX_PRIVATE_H_
#include <gst/gst.h>
#include <gst/base/gstadapter.h>
#include <gst/base/gstflowcombiner.h>
#include "gstadaptivedemux-types.h"
#include "gstadaptivedemux.h"
#include "gstadaptivedemuxutils.h"
G_BEGIN_DECLS
#define NUM_LOOKBACK_FRAGMENTS 3
#define MAX_DOWNLOAD_ERROR_COUNT 3
/* Internal, so not using GST_FLOW_CUSTOM_SUCCESS_N */
#define GST_ADAPTIVE_DEMUX_FLOW_SWITCH (GST_FLOW_CUSTOM_SUCCESS_2 + 2)
#define TRACKS_GET_LOCK(d) (&GST_ADAPTIVE_DEMUX_CAST(d)->priv->tracks_lock)
#define TRACKS_LOCK(d) g_mutex_lock (TRACKS_GET_LOCK (d))
#define TRACKS_UNLOCK(d) g_mutex_unlock (TRACKS_GET_LOCK (d))
#define BUFFERING_GET_LOCK(d) (&GST_ADAPTIVE_DEMUX_CAST(d)->priv->buffering_lock)
#define BUFFERING_LOCK(d) g_mutex_lock (BUFFERING_GET_LOCK (d))
#define BUFFERING_UNLOCK(d) g_mutex_unlock (BUFFERING_GET_LOCK (d))
#define GST_MANIFEST_GET_LOCK(d) (&(GST_ADAPTIVE_DEMUX_CAST(d)->priv->manifest_lock))
#define GST_MANIFEST_LOCK(d) G_STMT_START { \
GST_TRACE("Locking manifest from thread %p", g_thread_self()); \
g_rec_mutex_lock (GST_MANIFEST_GET_LOCK (d)); \
GST_TRACE("Locked manifest from thread %p", g_thread_self()); \
} G_STMT_END
#define GST_MANIFEST_UNLOCK(d) G_STMT_START { \
GST_TRACE("Unlocking manifest from thread %p", g_thread_self()); \
g_rec_mutex_unlock (GST_MANIFEST_GET_LOCK (d)); \
} G_STMT_END
#define GST_ADAPTIVE_DEMUX_GET_SCHEDULER(d) (GST_ADAPTIVE_DEMUX_CAST(d)->priv->scheduler_task)
#define GST_ADAPTIVE_SCHEDULER_LOCK(d) gst_adaptive_demux_scheduler_lock(demux)
#define GST_ADAPTIVE_SCHEDULER_UNLOCK(d) G_STMT_START { \
GST_TRACE("Unlocking scheduler from thread %p", g_thread_self()); \
gst_adaptive_demux_loop_unlock_and_unpause (GST_ADAPTIVE_DEMUX_GET_SCHEDULER (d)); \
} G_STMT_END
#define GST_ADAPTIVE_DEMUX_SEGMENT_GET_LOCK(d) (&GST_ADAPTIVE_DEMUX_CAST(d)->priv->segment_lock)
#define GST_ADAPTIVE_DEMUX_SEGMENT_LOCK(d) g_mutex_lock (GST_ADAPTIVE_DEMUX_SEGMENT_GET_LOCK (d))
#define GST_ADAPTIVE_DEMUX_SEGMENT_UNLOCK(d) g_mutex_unlock (GST_ADAPTIVE_DEMUX_SEGMENT_GET_LOCK (d))
struct _GstAdaptiveDemuxPrivate
{
GstAdapter *input_adapter; /* protected by manifest_lock */
gint have_manifest; /* MT safe */
/* Adaptive scheduling and parsing task */
GstAdaptiveDemuxLoop *scheduler_task;
/* Callback / timer id for the next manifest update */
guint manifest_updates_cb;
gboolean manifest_updates_enabled;
gboolean need_manual_manifest_update;
/* Count of failed manifest updates */
gint update_failed_count;
guint32 segment_seqnum; /* protected by manifest_lock */
/* main lock used to protect adaptive demux and all its streams.
* It serializes the adaptive demux public API.
*/
GRecMutex manifest_lock;
/* Duration, updated after manifest updates */
GstClockTime duration;
/* Set to TRUE if any stream is waiting on the manifest update */
gboolean stream_waiting_for_manifest;
/* Set to TRUE if streams can download fragment data. If FALSE,
* they can load playlists / prepare for updata_fragment_info()
*/
gboolean streams_can_download_fragments;
GMutex api_lock;
/* Protects demux and stream segment information
* Needed because seeks can update segment information
* without needing to stop tasks when they just want to
* update the segment boundaries */
GMutex segment_lock;
GstClockTime qos_earliest_time;
/* Protects all tracks and period content */
GMutex tracks_lock;
/* Used to notify addition to a waiting (i.e. previously empty) track */
GCond tracks_add;
/* TRUE if we are buffering */
gboolean is_buffering;
/* TRUE if percent changed and message should be posted */
gboolean percent_changed;
gint percent;
/* Serialises buffering message posting to avoid out-of-order
* posting */
GMutex buffering_lock;
/* Atomic */
guint32 requested_selection_seqnum;
/* Lock protecting all the following fields */
GRecMutex output_lock;
/* Output task */
GstTask *output_task;
/* List of enabled OutputSlot */
GList *outputs;
/* flow combiner of output slots */
GstFlowCombiner *flowcombiner;
/* protected by output_lock */
gboolean flushing;
/* Current output selection seqnum */
guint32 current_selection_seqnum;
/* Current output position (in running time) */
GstClockTime global_output_position;
/* End of fields protected by output_lock */
gint n_audio_streams, n_video_streams, n_subtitle_streams;
/* Counter used for uniquely identifying periods */
gint n_periods;
/* Array of periods.
*
* Head is the period being outputted, or to be outputted first
* Tail is where new streams get added */
GQueue *periods;
};
static inline gboolean gst_adaptive_demux_scheduler_lock(GstAdaptiveDemux *d)
{
GST_TRACE("Locking scheduler from thread %p", g_thread_self());
if (!gst_adaptive_demux_loop_pause_and_lock (GST_ADAPTIVE_DEMUX_GET_SCHEDULER (d)))
return FALSE;
GST_TRACE("Locked scheduler from thread %p", g_thread_self());
return TRUE;
}
void demux_update_buffering_locked (GstAdaptiveDemux * demux);
void demux_post_buffering_locked (GstAdaptiveDemux * demux);
GstFlowReturn gst_adaptive_demux_update_manifest (GstAdaptiveDemux *demux);
void gst_adaptive_demux2_stream_wants_manifest_update (GstAdaptiveDemux * demux);
void gst_adaptive_demux2_stream_parse_error (GstAdaptiveDemux2Stream *stream, GError * err);
GstClockTime gst_adaptive_demux2_stream_get_fragment_waiting_time (GstAdaptiveDemux2Stream * stream);
GstClockTime gst_adaptive_demux2_stream_get_presentation_offset (GstAdaptiveDemux2Stream * stream);
GstClockTime gst_adaptive_demux_get_period_start_time (GstAdaptiveDemux * demux);
gboolean gst_adaptive_demux_is_live (GstAdaptiveDemux * demux);
void gst_adaptive_demux2_stream_on_manifest_update (GstAdaptiveDemux2Stream * stream);
void gst_adaptive_demux2_stream_on_output_space_available (GstAdaptiveDemux2Stream *stream);
void gst_adaptive_demux2_stream_on_can_download_fragments(GstAdaptiveDemux2Stream *stream);
gboolean gst_adaptive_demux2_stream_has_next_fragment (GstAdaptiveDemux2Stream * stream);
GstFlowReturn gst_adaptive_demux2_stream_seek (GstAdaptiveDemux2Stream * stream,
gboolean forward, GstSeekFlags flags,
GstClockTimeDiff ts, GstClockTimeDiff * final_ts);
gboolean gst_adaptive_demux_get_live_seek_range (GstAdaptiveDemux * demux,
gint64 * range_start, gint64 * range_stop);
gboolean gst_adaptive_demux2_stream_in_live_seek_range (GstAdaptiveDemux * demux,
GstAdaptiveDemux2Stream * stream);
gboolean gst_adaptive_demux2_stream_is_selected_locked (GstAdaptiveDemux2Stream *stream);
gboolean gst_adaptive_demux_has_next_period (GstAdaptiveDemux * demux);
void gst_adaptive_demux_advance_period (GstAdaptiveDemux * demux);
GstFlowReturn gst_adaptive_demux2_stream_update_fragment_info (GstAdaptiveDemux2Stream * stream);
void gst_adaptive_demux2_stream_stop (GstAdaptiveDemux2Stream * stream);
gboolean gst_adaptive_demux_handle_lost_sync (GstAdaptiveDemux * demux);
typedef struct
{
GstMiniObject *item;
gsize size;
/* running time of item : GST_CLOCK_STIME_NONE for non-timed data */
GstClockTimeDiff runningtime;
/* GST_CLOCK_STIME_NONE for non-timed data */
GstClockTimeDiff runningtime_end;
/* running time of item for buffering tracking: GST_CLOCK_STIME_NONE for non-timed data */
GstClockTimeDiff runningtime_buffering;
} TrackQueueItem;
GstMiniObject * gst_adaptive_demux_track_dequeue_data_locked (GstAdaptiveDemux * demux, GstAdaptiveDemuxTrack * track, gboolean check_sticky_events);
void gst_adaptive_demux_track_flush (GstAdaptiveDemuxTrack * track);
void gst_adaptive_demux_track_drain_to (GstAdaptiveDemuxTrack * track, GstClockTime drain_running_time);
void gst_adaptive_demux_track_update_next_position (GstAdaptiveDemuxTrack * track);
void gst_adaptive_demux_track_update_level_locked (GstAdaptiveDemuxTrack * track);
/* Period functions */
GstAdaptiveDemuxPeriod * gst_adaptive_demux_period_new (GstAdaptiveDemux * demux);
GstAdaptiveDemuxPeriod * gst_adaptive_demux_period_ref (GstAdaptiveDemuxPeriod * period);
void gst_adaptive_demux_period_unref (GstAdaptiveDemuxPeriod * period);
gboolean gst_adaptive_demux_period_add_stream (GstAdaptiveDemuxPeriod * period,
GstAdaptiveDemux2Stream * stream);
gboolean gst_adaptive_demux_period_add_track (GstAdaptiveDemuxPeriod * period,
GstAdaptiveDemuxTrack * track);
gboolean gst_adaptive_demux_track_add_elements (GstAdaptiveDemuxTrack * track,
guint period_num);
void gst_adaptive_demux_period_select_default_tracks (GstAdaptiveDemux * demux,
GstAdaptiveDemuxPeriod * period);
void gst_adaptive_demux_period_transfer_selection (GstAdaptiveDemux * demux,
GstAdaptiveDemuxPeriod * next_period,
GstAdaptiveDemuxPeriod * current_period);
void gst_adaptive_demux_period_stop_tasks (GstAdaptiveDemuxPeriod * period);
GstFlowReturn gst_adaptive_demux_period_combine_stream_flows (GstAdaptiveDemuxPeriod * period);
gboolean gst_adaptive_demux_period_has_pending_tracks (GstAdaptiveDemuxPeriod * period);
void gst_adaptive_demux_period_check_input_wakeup_locked (GstAdaptiveDemuxPeriod * period, GstClockTimeDiff current_output_position);
G_END_DECLS
#endif