lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

ALSA: Add extra delay count in PCM

Browse Source 
Added runtime->delay field to adjust the delayed samples for snd_pcm_delay().
Typically a hardware FIFO length is stored in this field, so that the
extra delay between hwptr and applptr can be computed.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2008-10-13 03:07:14 +02:00
parent 091438dd56
commit 4bbe1ddf89
2 changed files with 6 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
sound/core/pcm_native.c
View File

@@ -587,14 +587,15 @@ int snd_pcm_status(struct snd_pcm_substream *substream,
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
status->avail = snd_pcm_playback_avail(runtime);
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
runtime->status->state == SNDRV_PCM_STATE_DRAINING)
runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
status->delay = runtime->buffer_size - status->avail;
else
status->delay += runtime->delay;
} else
status->delay = 0;
} else {
status->avail = snd_pcm_capture_avail(runtime);
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
status->delay = status->avail;
status->delay = status->avail + runtime->delay;
else
status->delay = 0;
}
@@ -2404,6 +2405,7 @@ static int snd_pcm_delay(struct snd_pcm_substream *substream,
n = snd_pcm_playback_hw_avail(runtime);
else
n = snd_pcm_capture_avail(runtime);
n += runtime->delay;
break;
case SNDRV_PCM_STATE_XRUN:
err = -EPIPE;