au: support g721 via g726 decoder

[ami_stuff]

"jack.au" plays ok with winamp/sox

file:

​https://bugzilla.gnome.org/attachment.cgi?id=142681

info:

​https://bugzilla.gnome.org/show_bug.cgi?id=594454

​http://lists.freedesktop.org/archives/gstreamer-commits/2009-September/037444.html

C:\>ffmpeg -i jack.au
ffmpeg version N-46755-ge70144c Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 15 2012 02:38:20 with gcc 4.5.0 (GCC) 20100414 (Fedora MinGW 4.5.
0-1.fc14)
  configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build --arch=
x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686-pc-min
gw32-gcc' --enable-w32threads --enable-memalign-hack --enable-runtime-cpudetect
--enable-cross-compile --enable-static --disable-shared --extra-libs='-lws2_32 -
lwinmm -lpthread' --extra-cflags='--static -I/var/www/users/research/ffmpeg/snap
shots/build/include' --extra-ldflags='-static -L/var/www/users/research/ffmpeg/s
napshots/build/lib' --enable-bzlib --enable-zlib --enable-gpl --enable-version3
--enable-nonfree --enable-libx264 --enable-libspeex --enable-libtheora --enable-
libvorbis --enable-libfaac --enable-libxvid --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libmp3lame --enable-libvpx --disable-decoder=libvpx
  libavutil      52.  6.100 / 52.  6.100
  libavcodec     54. 71.100 / 54. 71.100
  libavformat    54. 36.100 / 54. 36.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 23.100 /  3. 23.100
  libswscale      2.  1.102 /  2.  1.102
  libswresample   0. 16.100 /  0. 16.100
  libpostproc    52.  1.100 / 52.  1.100
[au @ 0x1edc300] could not determine bits per sample
[au @ 0x1edc300] If you want to help, upload a sample of this file to ftp://uplo
ad.ffmpeg.org/MPlayer/incoming/ and contact the ffmpeg-devel mailing list.
jack.au: Invalid data found when processing input

[Carl Eugen Hoyos]

Patch sent to ffmpeg-devel, it produces the same broken output as GStreamer, sox works fine for the sample.

[ami_stuff]

Thanks for the patch.

It turns out that Audition is able to save stereo au g721 files with various sampling frequencies and bitrates.

WinAMP plays all of the files correctly, SoX only mono.

​http://www.datafilehost.com/download-a0cff049.html

[Carl Eugen Hoyos]

Fixed in 640c70d.