On Thu, Apr 9, 2009 at 5:34 PM, Robert T. Drury <rtdrury@xxxxxxxxxxxxx> wrote: > On machine powerbook5,3 the built-in microphone is attached to > the right channel of the sound chip. In the alsa oss emulation > in linux-2.6.23.9 (alsa-*-1.0.12) the plugin layer copies the > left input channel to a one-channel buffer when calling ioctl > SNDCTL_DSP_CHANNELS with one channel. So no mic to mono on the > powerbook5,3. > > In the kernel source: linux-2.6.23.9/sound/core/oss/pcm_plugin.c: > > The function snd_pcm_plug_read_transfer copies from the two > channel hardware input buffer to the one channel user space > buffer. The left source channel appears to be selected for > copy in function snd_pcm_plug_format_plugins. One approach > is to query line/mic input there for powerbook5,3 and select > right channel source for copy. Any ideas? Try a recent ALSA. The latest is 1.0.19. 1.0.12 is way too old to debug. Lee _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
