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authorTakashi Iwai <tiwai@suse.de>2008-10-13 03:07:14 +0200
committerTakashi Iwai <tiwai@suse.de>2009-05-05 14:47:21 +0200
commit4bbe1ddf89a5ba3ec30fe5980912d8bda3a3cbb2 (patch)
treec57b1b83a23bd80535ea5b9220d07a3ab09df955 /sound/core
parent091438dd5668396328a3419abcbc6591159eb8d1 (diff)
ALSA: Add extra delay count in PCM
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>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/pcm_native.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index fc6f98e257d..cb769d415db 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -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;