On Aug 11, 2009, at 10:15 PM, Tim Newsham wrote:
The simplicity is definitely attractive in its own right,
and I'll consider it. However, the devices do provide hardware
support for other formats which do require some work to convert.
mu-law and a-law come to mind..
In all my life doing multimedia I'm yet to come across real use
of mu-law and a-law (except in legacy telephony which is really not
multimedia, if you ask me).
Russ is absolutely correct -- PCM is all there is for audio.
Everything else is really more of a datalink issue.
If you want a different device file into which you
can write mp3 and other sound file formats, great:
do it in user space, translating into the native hardware
format.
I agree wrt. "mp3". I'm considering the possibility of supporting
alaw, ulaw, pcm8, pcm16 in big/little and signed/unsigned formats,
and adpcm, using the hardware features...
Here's a complete list of audio formats that one can make hardware
either generate or accept. Where do you draw the line?
$ ffmpeg -formats | grep DEA | egrep -v "wmav|vorbis|flac"
DEA adpcm_4xm
DEA adpcm_adx
DEA adpcm_ct
DEA adpcm_ea
DEA adpcm_ima_dk3
DEA adpcm_ima_dk4
DEA adpcm_ima_qt
DEA adpcm_ima_smjpeg
DEA adpcm_ima_wav
DEA adpcm_ima_ws
DEA adpcm_ms
DEA adpcm_sbpro_2
DEA adpcm_sbpro_3
DEA adpcm_sbpro_4
DEA adpcm_swf
DEA adpcm_xa
DEA adpcm_yamaha
DEA g726
DEA gsm
DEA mp2
DEA pcm_alaw
DEA pcm_mulaw
DEA pcm_s16be
DEA pcm_s16le
DEA pcm_s24be
DEA pcm_s24daud
DEA pcm_s24le
DEA pcm_s32be
DEA pcm_s32le
DEA pcm_s8
DEA pcm_u16be
DEA pcm_u16le
DEA pcm_u24be
DEA pcm_u24le
DEA pcm_u32be
DEA pcm_u32le
DEA pcm_u8
DEA sonic
DEA vorbis
Thanks,
Roman.
