[FFmpeg-trac] #2229(swscale:new): sws_scale overwrites out[0][-1] on ppc

[FFmpeg]

#2229: sws_scale overwrites out[0][-1] on ppc
-------------------------------------+-------------------------------------
             Reporter:  cehoyos      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:  swscale
              Version:  git-master   |               Resolution:
             Keywords:  ppc          |               Blocked By:
  regression                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 Using attached patch, I get the following output:
 {{{
 $ ffmpeg -i tests/lena.pnm -pix_fmt rgba -f null -
 ffmpeg version N-49673-gb5884db Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Feb  7 2013 13:35:12 with gcc 4.2.1 (GCC) (Apple Inc. build
 5577)
   configuration: --cc=gcc-4.2 --enable-memalign-hack
   libavutil      52. 17.101 / 52. 17.101
   libavcodec     54. 91.101 / 54. 91.101
   libavformat    54. 61.104 / 54. 61.104
   libavdevice    54.  3.103 / 54.  3.103
   libavfilter     3. 35.101 /  3. 35.101
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
 Input #0, image2, from 'tests/lena.pnm':
   Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: ppm, rgb24, 256x256, 25 tbr, 25 tbn, 25 tbc
 Output #0, null, to 'pipe:':
   Metadata:
     encoder         : Lavf54.61.104
     Stream #0:0: Video: rawvideo (RGBA / 0x41424752), rgba, 256x256,
 q=2-31, 200 kb/s, 90k tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (ppm -> rawvideo)
 Press [q] to stop, [?] for help
 sws_scale() begin - dst: 0x194c010, dst[-1]: 16
 sws_scale() end   - dst: 0x194c010, dst[-1]: 255
 [null @ 0x1009e10] Encoder did not produce proper pts, making some up.
 frame=    1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
 video:0kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 -134.375000%
 ffmpeg(33692) malloc: *** error for object 0x194c011: Non-aligned pointer
 being freed
 *** set a breakpoint in malloc_error_break to debug
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2229#comment:7>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker