Re: [alsa-devel] Using snd_pcm_set_params() on a capture handle

On 10/26/2015 10:54 AM, Erik de Castro Lopo wrote:

Clemens Ladisch wrote:

...

To get the current parameters of the device, use snd_pcm_hw_params_current().

Ah, that makes sense. Now I get:

ACCESS:  RW_INTERLEAVED
FORMAT:  S32_LE
SUBFORMAT:  STD
SAMPLE_BITS: [0 0]
FRAME_BITS: [64 64]
CHANNELS: [2 2]
RATE: [48000 48000]
PERIOD_TIME: [6250 6250]
PERIOD_SIZE: [300 300]
PERIOD_BYTES: [0 0]
PERIODS: [0 0]
BUFFER_TIME: [0 0]
BUFFER_SIZE: [1200 1200]
BUFFER_BYTES: [9600 9600]
TICK_TIME: [0 0]

Why is SAMPLE_BITS == [0 0], even though the format is S32_LE?

That appears to be a bug in snd_pcm_hw_params_current() which does simply not set SAMPLE_BITS.

- Lars