On Mon, 21 Jul 2003, Eliot Blennerhassett wrote:
> Can aplay/alsa send raw MPEG data to a card?
>
> aplay -Dhw:0 -v -t raw --channels=2 --format=MPEG --rate=44100 ~/audio/44khz
> Playing raw data '/home/eliot/audio/44khz' : MPEG, Rate 44100 Hz, Stereo
> aplay: set_params:805: Sample format non available
>
> This command works fine if I specify S16_LE, S23, FLOAT, S24, but not MPEG.
> Any suggestions as to whe - do I have a hope of making it work?
> (My card supports all the above including MPEG in exactly the same way as far as
> ALSA driver is concerned)
>
> I have stepped through the code, and got lost in the bit twiddling of masks and
> formats. One thing I notice is that only the linear formats are mentioned in
> many of the functions in pcm_misc.c eg snd_pcm_format_width()
The handshake between driver and applications is not defined for MPEG and
other compressed formats.
Can you describe the MPEG stream which your hardware expects? It will help
us to design the APIs.
Thanks,
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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