Felix Paul Kühne pushed to branch master at VideoLAN / VLC
Commits:
1cd6abdf by Alexandre Janniaux at 2022-06-24T08:38:07+00:00
avcodec: remove useless flush
There is no requirement to call flush on exit. Indeed,
avcodec_flush_buffers is documented as needed for seeking or switching
to a different stream.
In addition, calling avcodec_flush_buffers currently triggers TSAN
warnings. Those warnings are still happening when calling the pf_flush
function from avcodec module, so it does not fix them per se, but it
does remove a systematic TSAN warning when opening/closing avcodec.
With ffmpeg at commit 73302aa193714958afb8262ceb14d9613e9df5ad:
WARNING: ThreadSanitizer: data race (pid=749126)
Write of size 8 at 0x7b8000053000 by thread T9:
#0 free
/usr/src/debug/gcc/libsanitizer/tsan/tsan_interceptors_posix.cpp:706
(libtsan.so.2+0x4e64f)
#1 ff_h264_free_tables src/libavcodec/h264dec.c:159
(libavcodec_plugin.so+0x24bced)
#2 module_unneed ../../src/modules/modules.c:304
(libvlccore.so.9+0x4ce1a)
#3 decoder_Clean ../../src/input/decoder_helpers.c:56
(libvlccore.so.9+0x8835f)
#4 DeleteDecoder ../../src/input/decoder.c:2005
(libvlccore.so.9+0x83edd)
#5 vlc_input_decoder_Delete ../../src/input/decoder.c:2254
(libvlccore.so.9+0x84f5c)
#6 EsOutDestroyDecoder ../../src/input/es_out.c:2406
(libvlccore.so.9+0x97c9b)
#7 EsOutUnselectEs ../../src/input/es_out.c:2575
(libvlccore.so.9+0x98902)
#8 EsOutVaPrivControlLocked ../../src/input/es_out.c:3734
(libvlccore.so.9+0x9f359)
#9 EsOutPrivControl ../../src/input/es_out.c:4028
(libvlccore.so.9+0xa1f0a)
#10 es_out_vaPrivControl ../../src/input/es_out.h:105
(libvlccore.so.9+0xa554f)
#11 es_out_PrivControl ../../src/input/es_out.h:112
(libvlccore.so.9+0xa5623)
#12 CmdExecutePrivControl ../../src/input/es_out_timeshift.c:1809
(libvlccore.so.9+0xadb9f)
#13 PrivControlLocked ../../src/input/es_out_timeshift.c:799
(libvlccore.so.9+0xa7c59)
#14 PrivControl ../../src/input/es_out_timeshift.c:858
(libvlccore.so.9+0xa8428)
#15 es_out_vaPrivControl ../../src/input/es_out.h:105
(libvlccore.so.9+0xafd79)
#16 es_out_PrivControl ../../src/input/es_out.h:112
(libvlccore.so.9+0xafe4d)
#17 es_out_SetMode ../../src/input/es_out.h:119
(libvlccore.so.9+0xafeb1)
#18 End ../../src/input/input.c:1400 (libvlccore.so.9+0xb5ec5)
#19 Run ../../src/input/input.c:431 (libvlccore.so.9+0xb1ba0)
Previous write of size 8 at 0x7b8000053000 by thread T10 (mutexes: write
M847):
#0 memset
/usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:799
(libtsan.so.2+0x652d2)
#1 ff_er_add_slice src/libavcodec/error_resilience.c:863
(libavcodec_plugin.so+0x866185)
Mutex M847 (0x7b7400024ea8) created at:
#0 pthread_mutex_init
/usr/src/debug/gcc/libsanitizer/tsan/tsan_interceptors_posix.cpp:1295
(libtsan.so.2+0x57446)
#1 ff_pthread_init src/libavcodec/pthread.c:122
(libavcodec_plugin.so+0x93ce3)
#2 OpenVideoCodec ../../modules/codec/avcodec/video.c:393
(libavcodec_plugin.so+0xdaac8)
#3 InitVideoDec ../../modules/codec/avcodec/video.c:592
(libavcodec_plugin.so+0xdbb26)
#4 generic_start ../../src/modules/modules.c:275
(libvlccore.so.9+0x4cc3d)
#5 vlc_module_load ../../src/modules/modules.c:243
(libvlccore.so.9+0x4c9db)
#6 module_need ../../src/modules/modules.c:286 (libvlccore.so.9+0x4cce2)
#7 module_need_var ../../include/vlc_modules.h:120
(libvlccore.so.9+0x7b8cb)
#8 LoadDecoder ../../src/input/decoder.c:234 (libvlccore.so.9+0x7bea7)
#9 CreateDecoder ../../src/input/decoder.c:1958
(libvlccore.so.9+0x83a70)
#10 decoder_New ../../src/input/decoder.c:2111 (libvlccore.so.9+0x847ba)
#11 vlc_input_decoder_New ../../src/input/decoder.c:2172
(libvlccore.so.9+0x84be5)
#12 EsOutCreateDecoder ../../src/input/es_out.c:2358
(libvlccore.so.9+0x977d5)
#13 EsOutSelectEs ../../src/input/es_out.c:2488
(libvlccore.so.9+0x98261)
#14 EsOutSelect ../../src/input/es_out.c:2774 (libvlccore.so.9+0x992d1)
#15 EsOutVaPrivControlLocked ../../src/input/es_out.c:3738
(libvlccore.so.9+0x9f418)
#16 EsOutPrivControl ../../src/input/es_out.c:4028
(libvlccore.so.9+0xa1f0a)
#17 es_out_vaPrivControl ../../src/input/es_out.h:105
(libvlccore.so.9+0xa554f)
#18 es_out_PrivControl ../../src/input/es_out.h:112
(libvlccore.so.9+0xa5623)
#19 CmdExecutePrivControl ../../src/input/es_out_timeshift.c:1809
(libvlccore.so.9+0xadb9f)
#20 PrivControlLocked ../../src/input/es_out_timeshift.c:799
(libvlccore.so.9+0xa7c59)
#21 PrivControl ../../src/input/es_out_timeshift.c:858
(libvlccore.so.9+0xa8428)
#22 es_out_vaPrivControl ../../src/input/es_out.h:105
(libvlccore.so.9+0xafd79)
#23 es_out_PrivControl ../../src/input/es_out.h:112
(libvlccore.so.9+0xafe4d)
#24 es_out_SetMode ../../src/input/es_out.h:119
(libvlccore.so.9+0xafeb1)
#25 InitPrograms ../../src/input/input.c:1227 (libvlccore.so.9+0xb5322)
#26 Init ../../src/input/input.c:1316 (libvlccore.so.9+0xb58c9)
#27 Run ../../src/input/input.c:426 (libvlccore.so.9+0xb1b7f)
Thread T9 'vlc-input' (tid=749136, running) created by main
thread at:
#0 pthread_create
/usr/src/debug/gcc/libsanitizer/tsan/tsan_interceptors_posix.cpp:1001
(libtsan.so.2+0x670c9)
#1 vlc_clone_attr ../../src/posix/thread.c:179
(libvlccore.so.9+0x17910c)
#2 vlc_clone ../../src/posix/thread.c:190 (libvlccore.so.9+0x1791b5)
#3 input_Start ../../src/input/input.c:130 (libvlccore.so.9+0xb0aca)
#4 vlc_player_input_Start ../../src/player/input.c:96
(libvlccore.so.9+0xc9640)
#5 vlc_player_Start ../../src/player/player.c:1176
(libvlccore.so.9+0xc54be)
#6 vlc_playlist_Start ../../src/playlist/player.c:176
(libvlccore.so.9+0x6146e)
#7 libvlc_InternalPlay ../../src/interface/interface.c:238
(libvlccore.so.9+0x59fa4)
#8 libvlc_playlist_play ../../lib/playlist.c:36 (libvlc.so.12+0xdd1b)
#9 main ../../bin/vlc.c:245 (vlc-static+0x2acd)
Thread T10 (tid=749137, running) created by thread T9 at:
#0 pthread_create
/usr/src/debug/gcc/libsanitizer/tsan/tsan_interceptors_posix.cpp:1001
(libtsan.so.2+0x670c9)
#1 init_thread src/libavcodec/pthread_frame.c:834
(libavcodec_plugin.so+0x93ebd)
#2 ff_frame_thread_init src/libavcodec/pthread_frame.c:890
(libavcodec_plugin.so+0x93ebd)
#3 OpenVideoCodec ../../modules/codec/avcodec/video.c:393
(libavcodec_plugin.so+0xdaac8)
#4 InitVideoDec ../../modules/codec/avcodec/video.c:592
(libavcodec_plugin.so+0xdbb26)
#5 generic_start ../../src/modules/modules.c:275
(libvlccore.so.9+0x4cc3d)
#6 vlc_module_load ../../src/modules/modules.c:243
(libvlccore.so.9+0x4c9db)
#7 module_need ../../src/modules/modules.c:286 (libvlccore.so.9+0x4cce2)
#8 module_need_var ../../include/vlc_modules.h:120
(libvlccore.so.9+0x7b8cb)
#9 LoadDecoder ../../src/input/decoder.c:234 (libvlccore.so.9+0x7bea7)
#10 CreateDecoder ../../src/input/decoder.c:1958
(libvlccore.so.9+0x83a70)
#11 decoder_New ../../src/input/decoder.c:2111 (libvlccore.so.9+0x847ba)
#12 vlc_input_decoder_New ../../src/input/decoder.c:2172
(libvlccore.so.9+0x84be5)
#13 EsOutCreateDecoder ../../src/input/es_out.c:2358
(libvlccore.so.9+0x977d5)
#14 EsOutSelectEs ../../src/input/es_out.c:2488
(libvlccore.so.9+0x98261)
#15 EsOutSelect ../../src/input/es_out.c:2774 (libvlccore.so.9+0x992d1)
#16 EsOutVaPrivControlLocked ../../src/input/es_out.c:3738
(libvlccore.so.9+0x9f418)
#17 EsOutPrivControl ../../src/input/es_out.c:4028
(libvlccore.so.9+0xa1f0a)
#18 es_out_vaPrivControl ../../src/input/es_out.h:105
(libvlccore.so.9+0xa554f)
#19 es_out_PrivControl ../../src/input/es_out.h:112
(libvlccore.so.9+0xa5623)
#20 CmdExecutePrivControl ../../src/input/es_out_timeshift.c:1809
(libvlccore.so.9+0xadb9f)
#21 PrivControlLocked ../../src/input/es_out_timeshift.c:799
(libvlccore.so.9+0xa7c59)
#22 PrivControl ../../src/input/es_out_timeshift.c:858
(libvlccore.so.9+0xa8428)
#23 es_out_vaPrivControl ../../src/input/es_out.h:105
(libvlccore.so.9+0xafd79)
#24 es_out_PrivControl ../../src/input/es_out.h:112
(libvlccore.so.9+0xafe4d)
#25 es_out_SetMode ../../src/input/es_out.h:119
(libvlccore.so.9+0xafeb1)
#26 InitPrograms ../../src/input/input.c:1227 (libvlccore.so.9+0xb5322)
#27 Init ../../src/input/input.c:1316 (libvlccore.so.9+0xb58c9)
#28 Run ../../src/input/input.c:426 (libvlccore.so.9+0xb1b7f)
SUMMARY: ThreadSanitizer: data race src/libavcodec/h264dec.c:159 in
ff_h264_free_tables
Revert of commit f2f61bf1c7c58e79dcb22cada3eea53f596355cc.
- - - - -
1 changed file:
- modules/codec/avcodec/video.c
Changes:
=====================================
modules/codec/avcodec/video.c
=====================================
@@ -1335,12 +1335,7 @@ void EndVideoDec( vlc_object_t *obj )
decoder_sys_t *p_sys = p_dec->p_sys;
AVCodecContext *ctx = p_sys->p_context;
- /* do not flush buffers if codec hasn't been opened (theora/vorbis/VC1) */
- if( avcodec_is_open( ctx ) )
- avcodec_flush_buffers( ctx );
-
cc_Flush( &p_sys->cc );
-
avcodec_free_context( &ctx );
if( p_sys->p_va )
View it on GitLab:
https://code.videolan.org/videolan/vlc/-/commit/1cd6abdf6c7db2bd8a8b50c757731d407dcb99ee
--
View it on GitLab:
https://code.videolan.org/videolan/vlc/-/commit/1cd6abdf6c7db2bd8a8b50c757731d407dcb99ee
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