[linux-audio-dev] very limited formats

[C.L. Tien - 田承禮]

Ron,

S doesn't mean stereo, it means signed for 16-bit sample. The i810_audio support only signed 16-bit little-endian PCM. AFMT_MU_LAW is rarely supported by today's hardware.

ChenLi Tien


-----Original Message-----
From:	Ron Shacham [mailto:rs2194 at columbia.edu]
Sent:	2003/12/31 [星期三] 下午 05:27
To:	linux-audio-dev at music.columbia.edu
Cc:	
Subject:	[linux-audio-dev] very limited formats
Hello, this is my first time posting.
I have been programming on my personal linux box (rh 8), and I've been
unable to set any audio formats on the sound device other than 16-bit
linear.  For example, I try the following:

int format = AFMT_MU_LAW;
ioctl(audio_fd, SNDCTL_DSP_SETFMT, &format);

I set this right after opening the device.

Then, when I query for the format, it returns 16.
The following:
ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &mask);
shows zeroes for everything except for AFMT_S16_NE

I have integrated audio hardware (intel i810).
I might also mention that I cannot get mono to work, but only stereo.
Any ideas?

Regards,
Ron