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

[Lars-Peter Clausen]

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