Alex and list;
On Wed, Nov 6, 2019 at 1:26 PM Alex Vazquez <avazquez....@gmail.com> wrote:
> Hi all.
> I'm using ALSA to configure a dmic. My dmic only support format S32_LE
> but I also need support format S16_LE.
>
> arecord -D hw:0,4 --dump-hw-params
> Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
> HW Params of device "hw:0,4":
> --------------------
> ACCESS: RW_INTERLEAVED
> FORMAT: S32_LE
> ......
> Available formats:
> - S32_LE
>
What about trying
arecord -D plughw:0,4 --dump-hw-params
>
> If I understood correctly, If I use "plug" plugin, it create an
> automatic format-conversion. To do so, I create a custom asounf.conf
> using the "plug" plugin.
>
> pcm.!default {
> type asym
> playback.pcm {
> type plug
> slave.pcm "hw:0,0"
> }
> capture.pcm {
> type plug
> slave.pcm "hw:0,4"
> }
>
> For a quick example, I used the arecord command. First I use S32_LE
> and it works.
> arecord -r 16000 -f S32_LE -c 1 -d 3 rec.wav
> Recording WAVE 'rec.wav' : Signed 32 bit Little Endian, Rate 16000 Hz....
>
> But when I try rec a audio with format S16_LE, It fails.
>
> arecord -r 16000 -f S16_LE -c 1 -d 3 rec.wav
> Recording WAVE 'rec.wav' : Signed 16 bit Little Endian, Rate 16000 Hz, Mono
> arecord: set_params:1361: Unable to install hw params:
> ACCESS: RW_INTERLEAVED
> FORMAT: S16_LE
> SUBFORMAT: STD
> SAMPLE_BITS: 16
> FRAME_BITS: 16
> CHANNELS: 1
> RATE: 16000
> PERIOD_TIME: 32000
> PERIOD_SIZE: 512
> PERIOD_BYTES: 1024
> PERIODS: 6
> BUFFER_TIME: 192000
> BUFFER_SIZE: 3072
> BUFFER_BYTES: 6144
>
> Is it possible to make an automatic format conversion?
> Is there any way to solve this problem?
>
>
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>
--
Chris Hermansen · clhermansen "at" gmail "dot" com
C'est ma façon de parler.
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