ALSA: firewire-motu: cache event ticks in source packet header per data block

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The devices in MOTU FireWire series put source packet header (SPH) into
each data block of tx packet for presentation time of event. The format
of timestamp is compliant to IEC 61883-1, with cycle and offset fields
without sec field of 32 bit cycle time.

This commit takes ALSA firewire-motu driver to cache the presentation
time as offset from cycle in which the packet is transferred.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210602013406.26442-3-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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This commit is contained in:

Takashi Sakamoto 2021-06-02 10:34:05 +09:00 • committed by Takashi Iwai

parent 138d1bceee

commit e50dfac81f

3 changed files with 70 additions and 3 deletions

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41

sound/firewire/motu/amdtp-motu.c

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20

sound/firewire/motu/motu-stream.c

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12

sound/firewire/motu/motu.h

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