https://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=55a25246ee80aa950bf27f811c0cc176d0821a4e
pulseaudio does not support non-interlaved mode
static void check_access(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams,
bool use_mmap) {
if ((use_mmap && !snd_pcm_hw_params_test_access(pcm_handle, hwparams,
SND_PCM_ACCESS_MMAP_INTERLEAVED)) ||
!snd_pcm_hw_params_test_access(pcm_handle, hwparams,
SND_PCM_ACCESS_RW_INTERLEAVED))
pa_log_error("Weird, PCM claims to support interleaved access, but
snd_pcm_hw_params_set_access() failed.");
+
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https://bugs.launchpad.net/bugs/1390474
Title:
"Volume element PCM has 6 channels. That's too much!" - PA doesn't
support elements with more than two channels
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