ALSA: firewire-tascam: reserve/release isochronous resources in pcm.hw_params/hw_free callbacks

Browse source

Once allocated, isochronous resources are available for packet
streaming, even if the streaming is cancelled. For this reason,
current implementation handles allocation of the resources and
starting packet streaming at the same time. However, this brings
complicated procedure to start packet streaming.

This commit separates the allocation and starting. The allocation is
done in pcm.hw_params callback and available till pcm.hw_free callback.
Even if any XRUN occurs, pcm.prepare callback is done to restart
packet streaming for allocated the resources.

There are two points to stop packet streaming; in pcm.hw_params and
pcm.prepare callbacks.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

...

This commit is contained in:

Takashi Sakamoto 2019-06-02 16:12:48 +09:00 • committed by Takashi Iwai

parent a364af2eec

commit 07b266424d

3 changed files with 66 additions and 37 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

22

sound/firewire/tascam/tascam-pcm.c

View file

89

sound/firewire/tascam/tascam-stream.c

View file

2

sound/firewire/tascam/tascam.h

View file