[alsa-devel] Mono <-> Stereo
achung at stlglobal.com
Wed Sep 1 16:02:18 CEST 2010
I'm completely new to ALSA development. I recently inherited a project
built on a Freescale i.MX 27 platform, using Linux 2.6.33
The MX27 is connected via I2S to a GSM module, and also a TLV32AIC3007
codec for local playback. There seems to be some format mismatch causing
the audio to become garbled.
I called in through the GSM and used "arecord -D plughw:0,1 -f dat
test.wav" to record some audio. I then played back with "aplay -D
1. If I play it through the GSM, I can hear what I recorded, but it
appears to be playing twice as fast
2. If I play it through the codec, I just get garbled junk
I'm told that this may be because the GSM module supports mono only,
whereas the IMX SSI driver supports only stereo out of the box.
Does anyone have any experience with such a setup, and can provide some
pointers on where to look at to resolve this issue?
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