[Gnash-commit] [patch #8747] Patches to fix 8-bit PCM sound wailing/crashing in FFmpeg media backend

[Nutchanon Wetchasit]

Follow-up Comment #6, patch #8747 (project gnash):

These patches are tested using PCM event sound with every combination
of `UNCOMPRESSED`/`RAW` (Little Endian) format, 44100 Hz/22050 Hz/11025 Hz
sample rate, 16-bit/8-bit depth, and 2/1 channels. All combination
used 1.0 sec (exact) audio length.

(PCM codec test files, including original sounds and build scripts,
are already attached to bug #45722 as `pcmplay*.zip`)

I have also briefly tested with other event sound codecs:
* MP3: all combination of 44100 Hz/22050 Hz/11025 Hz sample rate, 1 and 2
channels. (1.0 sec length)
* IMA-ADPCM: 44100 Hz, 2 channels with 2/3/4/5 bits predictor. (1.0 sec
length)

and some stream sound codecs:
* `RAW` PCM: 22050 Hz 8-bit 2 channels (6.0 sec length, 12 fps)
* MP3: 44100 Hz 2 channels CBR 128kbps (6.0 sec length, 12 fps)
* IMA-ADPCM: 44100 Hz 1 channel with 4-bit predictor (6.0 sec length, 12 fps)

No side effects have been found so far.

Note: Speex codec is not tested due to the lack of tools (SWFmill currently
doesn't know how to deal with Ogg/Speex file). Asao/Nellymoser codec is not
tested due to the lack of decoding support in my libAV installation
(`gnash --media=gst` played it nicely though).

Gnash: 0.8.11dev (patched against git 516a6ca 15-Sep-2015)
SDL: libsdl1.2debian 1.2.15-5 (debian)
libAV: libavcodec53 6:0.8.17-1 (debian), libavformat53 6:0.8.17-1 (debian),
libavutil51 6:0.8.17-1 (debian)
CSound: libcsound64-5.2 1:5.17.11~dfsg-3 (debian)
System: Debian GNU/Linux 7.0 Wheezy i386

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