ALSA snd_xferi_t buffer arrangment

["Assaf Hoffman" <hoffman@xxxxxxxxxxx>]

Hi,

I’m mew to sound and ALSA.

My project deals with PCM in standard (I2S) mode and IEC958 (SPDIF) mode.

Can anyone tell me how the ALSA stack expects to “see” the data received form the sound device? I mean, what is the format of the data DMA’ed from the sound device to DRAM that the ALSA stack expects?

Is this raw sound data? SPDIF frame includes non sound data as well. Does the sound card HW strip the sound payload from the IEC958 frame to deliver the raw sound data to the ALSA buffer?

Please shed some light…

Many thanks.

 

 

 

MOVING FORWARD FASTER

 

Assaf Hoffman – Senior SW engineer
Marvell Semiconductor Israel Ltd
6 Hamada Street
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Email - hoffman@xxxxxxxxxxx
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WWW Page: http://www.marvell.com

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