From 53867aa9d834fd6a6314803655bd4c444d0e1df4 Mon Sep 17 00:00:00 2001 From: wm4 Date: Sun, 22 Feb 2015 19:06:21 +0100 Subject: [PATCH] player: fix demuxer lifetime management Commit f54220d9 attempted to improve this, but it got worse. Now there was a crash when ytdl_hook.lua added external tracks. This happened because close_unused_demuxers() assumed that sources[0] was the main demuxer (so that it didn't close it). This assumption failed, because the ytdl script can add external tracks before the main file is loaded. The easy fix would have been to check for master_demuxer, and not i==0. But instead give up on the old idea, make some stricter assumptions how demuxers and external tracks map, and simplify the code. --- player/core.h | 4 +- player/loadfile.c | 103 +++++++++++++++++++++------------------------- 2 files changed, 49 insertions(+), 58 deletions(-) diff --git a/player/core.h b/player/core.h index ad700cbc22..1f2b72bfb4 100644 --- a/player/core.h +++ b/player/core.h @@ -180,7 +180,7 @@ typedef struct MPContext { int64_t shown_vframes, shown_aframes; struct stream *stream; // stream that was initially opened - struct demuxer **sources; + struct demuxer **sources; // all open demuxers int num_sources; struct timeline *tl; @@ -191,7 +191,7 @@ typedef struct MPContext { int num_chapters; double video_offset; - struct demuxer *demuxer; + struct demuxer *demuxer; // can change with timeline struct mp_tags *filtered_tags; struct track **tracks; diff --git a/player/loadfile.c b/player/loadfile.c index b16f1026aa..36d0e4e786 100644 --- a/player/loadfile.c +++ b/player/loadfile.c @@ -59,66 +59,45 @@ #include "command.h" #include "libmpv/client.h" -static void close_unused_demuxers(struct MPContext *mpctx) -{ - for (int i = mpctx->num_sources - 1; i >= 0; i--) { - struct demuxer *d = mpctx->sources[i]; - - if (i == 0 || d == mpctx->track_layout) - goto skip; - for (int t = 0; t < mpctx->num_tracks; t++) { - if (d == mpctx->tracks[t]->demuxer) - goto skip; - } - for (int t = 0; t < mpctx->num_timeline_parts; t++) { - if (mpctx->timeline[t].source == d) - goto skip; - } - - uninit_stream_sub_decoders(d); - free_demuxer_and_stream(d); - MP_TARRAY_REMOVE_AT(mpctx->sources, mpctx->num_sources, i); - - skip:; - } -} - static void uninit_demuxer(struct MPContext *mpctx) { assert(!mpctx->d_video && !mpctx->d_audio && !mpctx->d_sub[0] && !mpctx->d_sub[1]); - for (int i = 0; i < mpctx->num_tracks; i++) { - talloc_free(mpctx->tracks[i]); - } - mpctx->num_tracks = 0; for (int r = 0; r < NUM_PTRACKS; r++) { for (int t = 0; t < STREAM_TYPE_COUNT; t++) mpctx->current_track[r][t] = NULL; } mpctx->track_layout = NULL; - mpctx->master_demuxer = NULL; mpctx->demuxer = NULL; - if (!mpctx->tl) - mpctx->num_timeline_parts = 0; - for (int i = 0; i < mpctx->num_sources; i++) - uninit_stream_sub_decoders(mpctx->sources[i]); - close_unused_demuxers(mpctx); - if (mpctx->tl) { - timeline_destroy(mpctx->tl); - } else { - talloc_free(mpctx->timeline); - } - mpctx->timeline = NULL; - mpctx->num_timeline_parts = 0; - mpctx->tl = NULL; - if (mpctx->num_sources > 0) - free_demuxer(mpctx->sources[0]); - talloc_free(mpctx->sources); - mpctx->sources = NULL; - mpctx->num_sources = 0; talloc_free(mpctx->chapters); mpctx->chapters = NULL; mpctx->num_chapters = 0; + + // per-stream cached subtitle state + for (int i = 0; i < mpctx->num_sources; i++) + uninit_stream_sub_decoders(mpctx->sources[i]); + + // close demuxers for external tracks + for (int n = mpctx->num_tracks - 1; n >= 0; n--) { + mpctx->tracks[n]->selected = false; + mp_remove_track(mpctx, mpctx->tracks[n]); + } + for (int i = 0; i < mpctx->num_tracks; i++) + talloc_free(mpctx->tracks[i]); + mpctx->num_tracks = 0; + + mpctx->timeline = NULL; + mpctx->num_timeline_parts = 0; + timeline_destroy(mpctx->tl); + mpctx->tl = NULL; + + free_demuxer(mpctx->master_demuxer); + mpctx->master_demuxer = NULL; + + talloc_free(mpctx->sources); + mpctx->sources = NULL; + mpctx->num_sources = 0; + mpctx->video_offset = 0; } @@ -660,13 +639,23 @@ bool mp_remove_track(struct MPContext *mpctx, struct track *track) if (track->selected) return false; + struct demuxer *d = track->demuxer; + int index = 0; while (index < mpctx->num_tracks && mpctx->tracks[index] != track) index++; MP_TARRAY_REMOVE_AT(mpctx->tracks, mpctx->num_tracks, index); talloc_free(track); - close_unused_demuxers(mpctx); + // Close the demuxer, unless there is still a track using it. These are + // all external tracks, so there are no complications due to the timeline + // mechanism switching the track's demuxer dynamically. + bool in_use = false; + for (int n = mpctx->num_tracks - 1; n >= 0 && !in_use; n--) + in_use |= mpctx->tracks[n]->demuxer == d; + + if (!in_use) + free_demuxer_and_stream(d); mp_notify(mpctx, MPV_EVENT_TRACKS_CHANGED, NULL); @@ -975,7 +964,7 @@ static void open_demux_reentrant(struct MPContext *mpctx) mpctx_run_reentrant(mpctx, open_demux_thread, &args); if (args.demux) { talloc_steal(args.demux, args.global); - mpctx->demuxer = args.demux; + mpctx->master_demuxer = args.demux; mpctx->tl = args.tl; } else { talloc_free(args.global); @@ -984,9 +973,10 @@ static void open_demux_reentrant(struct MPContext *mpctx) static void load_timeline(struct MPContext *mpctx) { - mpctx->track_layout = mpctx->demuxer; + mpctx->track_layout = mpctx->master_demuxer; - MP_TARRAY_APPEND(NULL, mpctx->sources, mpctx->num_sources, mpctx->demuxer); + MP_TARRAY_APPEND(NULL, mpctx->sources, mpctx->num_sources, + mpctx->master_demuxer); if (mpctx->tl) { mpctx->timeline = mpctx->tl->parts; @@ -995,10 +985,11 @@ static void load_timeline(struct MPContext *mpctx) mpctx->chapters = demux_copy_chapter_data(mpctx->tl->chapters, mpctx->tl->num_chapters); mpctx->track_layout = mpctx->tl->track_layout; - mpctx->num_sources = 0; for (int n = 0; n < mpctx->tl->num_sources; n++) { - MP_TARRAY_APPEND(NULL, mpctx->sources, mpctx->num_sources, - mpctx->tl->sources[n]); + if (mpctx->tl->sources[n] != mpctx->master_demuxer) { + MP_TARRAY_APPEND(NULL, mpctx->sources, mpctx->num_sources, + mpctx->tl->sources[n]); + } } } @@ -1111,12 +1102,12 @@ goto_reopen_demuxer: ; mp_nav_reset(mpctx); open_demux_reentrant(mpctx); - if (!mpctx->demuxer) { + if (!mpctx->master_demuxer) { MP_ERR(mpctx, "Failed to recognize file format.\n"); mpctx->error_playing = MPV_ERROR_UNKNOWN_FORMAT; goto terminate_playback; } - mpctx->master_demuxer = mpctx->demuxer; + mpctx->demuxer = mpctx->master_demuxer; load_timeline(mpctx);