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drivers: audio: mpxxdtyy: Handle PCM block sizes of more than 1 ms

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The Open_PDM_Filter_64/128() functions of the third-party OpenPDMFilter
library are designed to handle a fixed PCM block size of 1 ms of audio.
Allow the MPxxDTyy drivers to use a block size of more than 1 ms by
calling the filtering function multiple times, once for each ms of
audio.

Fixes zephyrproject-rtos/zephyr#69447

Signed-off-by: Petar Susac <petar.susac@byte-lab.com>
This commit is contained in:
Petar Susac 2024-03-25 15:27:36 +01:00 committed by Alberto Escolar
parent 701b6aed4b
commit e3cacf7390
1 changed files with 29 additions and 18 deletions
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29
drivers/audio/mpxxdtyy.c
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@ -90,7 +90,8 @@ int sw_filter_lib_run(TPDMFilter_InitStruct *pdm_filter,
void *pdm_block, void *pcm_block,
size_t pdm_size, size_t pcm_size)
{
int i;
int i, j;
int pdm_offset;
uint8_t a, b;
if (pdm_block == NULL || pcm_block == NULL || pdm_filter == NULL) {
@ -118,26 +119,36 @@ int sw_filter_lib_run(TPDMFilter_InitStruct *pdm_filter,
}
}
for (j = 0; j < pcm_size / 2; j += pdm_filter[0].Fs / 1000) {
/*
* The number of PDM bytes per PCM sample is the decimation factor
* divided by the number of bits per byte (8). We need to skip a number of
* PDM bytes equivalent to the number of PCM samples, times the number of
* channels.
*/
pdm_offset = j * (pdm_filter[0].Decimation / 8) * pdm_filter[0].In_MicChannels;
for (i = 0; i < pdm_filter[0].In_MicChannels; i++) {
switch (pdm_filter[0].Decimation) {
case 64:
for (i = 0; i < pdm_filter[0].In_MicChannels; i++) {
Open_PDM_Filter_64(&((uint8_t *) pdm_block)[i],
&((uint16_t *) pcm_block)[i],
Open_PDM_Filter_64(&((uint8_t *) pdm_block)[pdm_offset + i],
&((uint16_t *) pcm_block)[j + i],
pdm_filter->MaxVolume,
&pdm_filter[i]);
}
break;
case 128:
for (i = 0; i < pdm_filter[0].In_MicChannels; i++) {
Open_PDM_Filter_128(&((uint8_t *) pdm_block)[i],
&((uint16_t *) pcm_block)[i],
Open_PDM_Filter_128(&((uint8_t *) pdm_block)[pdm_offset + i],
&((uint16_t *) pcm_block)[j + i],
pdm_filter->MaxVolume,
&pdm_filter[i]);
}
break;
default:
return -EINVAL;
}
}
}
return 0;
}