[Ffmpeg-devel] WMA optomisations have broken WMA decodingunderBeOS

[Dennis van Amerongen]

> -----Oorspronkelijk bericht-----
> Van: ffmpeg-devel-bounces at mplayerhq.hu 
> [mailto:ffmpeg-devel-bounces at mplayerhq.hu] Namens Dennis van Amerongen
> Verzonden: Saturday, August 26, 2006 11:03 AM
> Aan: FFMpeg development discussions and patches
> Onderwerp: RE: [Ffmpeg-devel] WMA optomisations have broken 
> WMA decodingunderBeOS
> 
> > On 24/08/06, Luca Barbato <lu_zero at gentoo.org> wrote:
> > >
> > >
> > >
> > > Should be fixed now, make sure the buffers are aligned
> > 
> > 
> > If you mean the r6050 fixes, they don't fix it. Using r6058 here.
> > 
> > Cian
> > 
> > --
> > -------------------------
> > "We're busy running out of time"
> > _______________________________________________
> > ffmpeg-devel mailing list
> > ffmpeg-devel at mplayerhq.hu
> > http://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel
> > 
> 
> Ran into the same instant crash problem decoding wma samples 
> on Windows XP using ffmpeg svn (6088) in VLC media player. 
> Same workarounds apply:
> reverting to a revision before 6026 or disabling mmx 
> altogether in the player. Using native codecs through "dmo" 
> runs fine too. Compiled with Cygwin GCC 3.4.4-2.
> 
> D

Backtrace with the crash problem on vector_fmul_add_add_sse. Alignment
issues?


$ ffmpeg.exe -i pinball.wmv -y test.wav
FFmpeg version SVN-r6110, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --enable-mingw32 --enable-memalign-hack --cc=gcc
-mno-cygwin --enable-gpl --enable-pp 
  libavutil version: 49.0.0
  libavcodec version: 51.11.0
  libavformat version: 50.5.0
  built on Aug 27 2006 21:56:18, gcc: 3.4.5 (mingw special)
[wmv3 @ 006BAE10]Header: 4C391A01

Seems that stream 1 comes from film source: 1000.00 (1000/1) -> 24.00
(24/1)
Input #0, asf, from 'pinball.wmv':
  Duration: 00:00:21.8, start: 3.000000, bitrate: 306 kb/s
  Stream #0.0: Audio: wmav2, 44100 Hz, stereo, 64 kb/s
  Stream #0.1: Video: wmv3, yuv420p, 320x176, 24.00 fps(r)
Output #0, wav, to 'test.wav':
  Stream #0.0: Audio: pcm_s16le, 44100 Hz, stereo, 1411 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
size=    3776kB time=21.9 bitrate=1411.2kbits/s    
video:0kB audio:3776kB global headers:0kB muxing overhead 0.001138%


$ gdb ffplay_g.exe
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This GDB was configured as "i686-pc-mingw32"...
(gdb) run pinball.wmv
Starting program: C:\msys\home\Administrator\ffmpeg-trunk/ffplay_g.exe
pinball.wmv

Program received signal SIGSEGV, Segmentation fault.
[Switching to thread 5040.0xa78]
0x004dd894 in vector_fmul_add_add_sse (dst=0x1a94ed0, src0=0x270bde8, 
    src1=0x2707d68, src2=0x1a94ed0, src3=0, len=4096, step=1)
    at i386/dsputil_mmx.c:2934
2934            asm volatile(
(gdb) bt
#0  0x004dd894 in vector_fmul_add_add_sse (dst=0x1a94ed0,
src0=0x270bde8, 
    src1=0x2707d68, src2=0x1a94ed0, src3=0, len=4096, step=1)
    at i386/dsputil_mmx.c:2934
#1  0x005d53cf in wma_decode_block (s=0x1a88980) at wmadec.c:1128
#2  0x005d5ee7 in wma_decode_superframe (avctx=0x19890f0,
data=0x16f00c8, 
    data_size=0x270ff04, buf=0x1a7c730 "\005", buf_size=1487) at
wmadec.c:1163
#3  0x00458e8e in avcodec_decode_audio (avctx=0x19890f0,
samples=0x16f00c8, 
    frame_size_ptr=0x270ff04, buf=0x1a7c730 "\005", buf_size=1487)
    at utils.c:992
#4  0x004034db in sdl_audio_callback (opaque=0x16f0030, stream=0x221a070
"", 
    len=4096) at ffplay.c:1491
#5  0x100013fb in SDL_GetAppState () from c:\msys\mingw\bin\SDL.dll
#6  0x016f0030 in ?? ()
#7  0x0221a070 in ?? ()
#8  0x00001000 in ?? ()
#9  0x019c2910 in ?? ()
#10 0x01a66810 in ?? ()
#11 0x003ffe60 in ?? ()
#12 0x10001310 in SDL_GetAppState () from c:\msys\mingw\bin\SDL.dll
#13 0x003f6a30 in ?? ()
#14 0x00000000 in ?? () from 
#15 0x0221a070 in ?? ()
#16 0x016f0030 in ?? ()
#17 0x00403420 in subtitle_thread ()
    at C:/msys/home/Administrator/ffmpeg-trunk/libavformat/avformat.h:71
(gdb) Previous frame inner to this frame (corrupt stack?)