[AudioI] Fwd: help with arecord on raspberry pi 4 model B

[people at lists.audioinjector.net]

Yes indeed,

Back in November 2017 patches were made to the Raspberry Pi's I2S driver 
which made it impossible to record less then 32kHz sample rates with the 
wm8731 codec. You can see the patches here :

https://github.com/raspberrypi/linux/commits/rpi-4.19.y/sound/soc/bcm/bcm2835-i2s.c

You can see a discussion on this here :

https://github.com/Audio-Injector/stereo-and-zero/issues/21

The simple work around is to resample in software using plughw like so :

arecord -D plughw:0 -r 8000 -c 2

On 17/3/20 10:58 am, people--- via People wrote:
>
>
> ---------- Forwarded message ---------
> De: *Marcelo Pedro* <marcelo.pedro at rute.ai <mailto:marcelo.pedro at rute.ai>>
> Date: seg., 16 de mar. de 2020 às 20:43
> Subject: help with arecord on raspberry pi 4 model B
> To: <People-request at lists.audioinjector.net 
> <mailto:People-request at lists.audioinjector.net>>
>
>
> When I try to record using Audio Injector Zero card with rate of 8000 
> hz using "arecord -r 8000" , I get this message on terminal:
>
> Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
> arecord: set_params:1403: Unable to install hw params:
> ACCESS:  RW_INTERLEAVED
> FORMAT:  U8
> SUBFORMAT:  STD
> SAMPLE_BITS: 8
> FRAME_BITS: 8
> CHANNELS: 1
> RATE: 8000
> PERIOD_TIME: 125000
> PERIOD_SIZE: 1000
> PERIOD_BYTES: 1000
> PERIODS: 4
> BUFFER_TIME: 500000
> BUFFER_SIZE: 4000
> BUFFER_BYTES: 4000
> TICK_TIME: 0
>
> Even knowing that I can record on this rate, because of this command 
> "arecord -D hw:0,0 --dump-hw-params", getting this message:
> Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
> HW Params of device "hw:0,0":
> --------------------
> ACCESS:  MMAP_INTERLEAVED RW_INTERLEAVED
> FORMAT:  S16_LE S24_LE S32_LE
> SUBFORMAT:  STD
> SAMPLE_BITS: [16 32]
> FRAME_BITS: [32 64]
> CHANNELS: 2
> RATE: [8000 96000]
> PERIOD_TIME: (333 8192000]
> PERIOD_SIZE: [32 65536]
> PERIOD_BYTES: [256 524288]
> PERIODS: [2 4096]
> BUFFER_TIME: (666 16384000]
> BUFFER_SIZE: [64 131072]
> BUFFER_BYTES: [256 524288]
> TICK_TIME: ALL
> --------------------
> arecord: set_params:1339: Sample format non available
> Available formats:
> - S16_LE
> - S24_LE
> - S32_LE
>
> I'm using raspberry pi 4 model B and Raspbian buster with kernel 
> version 4.19.108-v7l+. Could someone help me please
>
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