Subject: RE: [linux-audio-dev] very limited formats
From: C.L. Tien - ¥Ð©Ó (cltien_AT_cmedia.com.tw)
Date: Thu Jan 01 2004 - 03:19:38 EET
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 [¬P´Á¤T] ¤U¤È 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
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