[alsa-devel] (no subject)

[Clemens Ladisch]

Ben Dooks wrote:
> On 2020-01-30 14:58, Clemens Ladisch wrote:
>> Ben Dooks wrote:
>>> On 30/01/2020 09:31, Clemens Ladisch wrote:
>>>> S24_LE:  24-bit samples in 32-bit words, aligned to the LSB
>>>> S32_LE:  24-bit samples in 32-bit words, aligned to the MSB
>>>>
>>>> It is very unlikely that your hardware implements S24_LE.
>>>
>>> Which is wrong, since this is exactly what the hardware implements.
>>>
>>> The DMA fetches 32 bit words, and then the front end dispatches only
>>> 24 bits of these to the I2S/TDM
>>
>> Which 24 bits?  Is the padding in the first byte (S32_LE) or in the
>> last byte (S24_LE)?
>
> I think the low 24 bits are sent from the 32 bit word.

This would indeed by S24_LE.  If you change the driver to say that it
supports _only_ S24_LE, is the data then played correctly?


Regards,
Clemens