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ALSA: line6: Skip volume manipulation during silence copying 

A minor optimization; while pausing, the driver just copies the zero
that doesn't need any volume changes.

Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-01-23 16:58:30 +01:00
parent c8491535d7
commit 62a109d9e2
1 changed files with 3 additions and 2 deletions
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5
sound/usb/line6/playback.c
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@ -234,13 +234,14 @@ static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
line6pcm->out.pos += urb_frames;
if (line6pcm->out.pos >= runtime->buffer_size)
line6pcm->out.pos -= runtime->buffer_size;
change_volume(urb_out, line6pcm->volume_playback,
bytes_per_frame);
} else {
memset(urb_out->transfer_buffer, 0,
urb_out->transfer_buffer_length);
}
change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame);
if (line6pcm->prev_fbuf != NULL) {
if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) {
create_impulse_test_signal(line6pcm, urb_out,