https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/pci/rme9652/hdsp.c
static struct snd_pcm_hardware snd_hdsp_capture_subinfo =
{
.info = (SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_NONINTERLEAVED |
SNDRV_PCM_INFO_SYNC_START),
#ifdef SNDRV_BIG_ENDIAN
.formats = SNDRV_PCM_FMTBIT_S32_BE,
#else
.formats = SNDRV_PCM_FMTBIT_S32_LE,
#endif
.rates = (SNDRV_PCM_RATE_32000 |
SNDRV_PCM_RATE_44100 |
SNDRV_PCM_RATE_48000 |
SNDRV_PCM_RATE_64000 |
SNDRV_PCM_RATE_88200 |
SNDRV_PCM_RATE_96000),
.rate_min = 32000,
.rate_max = 96000,
.channels_min = 5,
.channels_max = HDSP_MAX_CHANNELS,
.buffer_bytes_max = HDSP_CHANNEL_BUFFER_BYTES * HDSP_MAX_CHANNELS,
.period_bytes_min = (64 * 4) * 10,
.period_bytes_max = (8192 * 4) * HDSP_MAX_CHANNELS,
.periods_min = 2,
.periods_max = 2,
.fifo_size = 0
};
only support 2 periods and non-interleaved access mode
pulseaudio cannot use 4 fragments
this mean one period of channel 1 , follow by one period of channel 2
,..., one period of channel n
seem has flag to control the precision of hw pointer
static snd_pcm_uframes_t hdsp_hw_pointer(struct hdsp *hdsp)
{
int position;
position = hdsp_read(hdsp, HDSP_statusRegister);
if (!hdsp->precise_ptr)
return (position & HDSP_BufferID) ? (hdsp->period_bytes / 4) :
0;
position &= HDSP_BufferPositionMask;
position /= 4;
position &= (hdsp->period_bytes/2) - 1;
return position;
}
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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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https://bugs.launchpad.net/pulseaudio/+bug/1390474/+subscriptions
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