[FFmpeg-trac] #10577(swscale:new): add support for ay10 pixel format

[FFmpeg]

#10577: add support for ay10 pixel format
-------------------------------------+-----------------------------------
             Reporter:  micolous     |                    Owner:  (none)
                 Type:  enhancement  |                   Status:  new
             Priority:  normal       |                Component:  swscale
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-----------------------------------
Comment (by micolous):

 Attached PNG rendering was produced with that patch and:

 {{{
 ffmpeg -f rawvideo -pixel_format ay10be -colorspace bt709 -video_size
 1920x1080 -i atem-colourbars5.expanded -pix_fmt rgba atem-
 colourbars5.'%03d'.png
 }}}

 Unfortunately, it appears my patch is broken for the reverse conversion.
 There's probably something I've missed:

 {{{
 % ./ffmpeg -i /tmp/atem-colourbars5.expanded.png -f rawvideo -pix_fmt
 ay10be -colorspace bt709 /tmp/atem-colourbars5.redux
 ffmpeg version N-112139-g95b5c81729 Copyright (c) 2000-2023 the FFmpeg
 developers
   built with Apple clang version 15.0.0 (clang-1500.0.40.1)
   configuration:
   libavutil      58. 25.100 / 58. 25.100
   libavcodec     60. 26.100 / 60. 26.100
   libavformat    60. 13.100 / 60. 13.100
   libavdevice    60.  2.101 / 60.  2.101
   libavfilter     9. 11.100 /  9. 11.100
   libswscale      7.  3.100 /  7.  3.100
   libswresample   4. 11.100 /  4. 11.100
 Input #0, png_pipe, from '/tmp/atem-colourbars5.expanded.png':
   Duration: N/A, bitrate: N/A
   Stream #0:0: Video: png, rgba(pc, gbr/unknown/unknown), 1920x1080, 25
 fps, 25 tbr, 25 tbn
 File '/tmp/atem-colourbars5.redux' already exists. Overwrite? [y/N] y
 Stream mapping:
   Stream #0:0 -> #0:0 (png (native) -> rawvideo (native))
 Press [q] to stop, [?] for help
 zsh: segmentation fault  ./ffmpeg -i /tmp/atem-colourbars5.expanded.png -f
 rawvideo -pix_fmt ay10be
 }}}

 {{{
 (lldb) bt
 * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
 (code=1, address=0x0)
   * frame #0: 0x0000000000000000
     frame #1: 0x000000010105bb38 ffmpeg`___lldb_unnamed_symbol23068 + 472
     frame #2: 0x000000010102ed71 ffmpeg`___lldb_unnamed_symbol22944 + 2801
     frame #3: 0x000000010102c771 ffmpeg`___lldb_unnamed_symbol22933 + 2129
     frame #4: 0x000000010102cc76 ffmpeg`ff_sws_slice_worker + 326
     frame #5: 0x00000001010c2e75 ffmpeg`avpriv_slicethread_execute + 245
     frame #6: 0x000000010102be1b ffmpeg`sws_receive_slice + 219
     frame #7: 0x000000010102cabb ffmpeg`sws_scale_frame + 171
     frame #8: 0x00000001002bdc17 ffmpeg`___lldb_unnamed_symbol12640 + 1639
     frame #9: 0x00000001000f47ef ffmpeg`ff_filter_activate + 1039
     frame #10: 0x00000001000f9a48 ffmpeg`av_buffersrc_add_frame_flags +
 808
     frame #11: 0x0000000100010d67 ffmpeg`ifilter_send_frame + 839
     frame #12: 0x000000010000276f ffmpeg`dec_packet + 399
     frame #13: 0x000000010002b88d ffmpeg`___lldb_unnamed_symbol10166 + 61
     frame #14: 0x000000010002a532 ffmpeg`main + 4018
     frame #15: 0x00007ff80dd9341f dyld`start + 1903
 }}}

 There's probably "something obvious" I'm missing here.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10577#comment:1>
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