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Merge branch 'topic/pcm-delay' into for-linus 

* topic/pcm-delay:
  ALSA: usbaudio - Add delay account
  ALSA: Add extra delay count in PCM
This commit is contained in:
Takashi Iwai 2009-06-10 07:26:40 +02:00
parent 9dea75c709 ae1ec5e1e9
commit eabaf0634a
3 changed files with 19 additions and 4 deletions
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1
include/sound/pcm.h
View File

@ -270,6 +270,7 @@ struct snd_pcm_runtime {
snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
/* -- HW params -- */
snd_pcm_access_t access; /* access mode */

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;
}
@ -2410,6 +2411,7 @@ 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;

14
sound/usb/usbaudio.c
View File

@ -627,6 +627,7 @@ static int prepare_playback_urb(struct snd_usb_substream *subs,
subs->hwptr_done += offs;
if (subs->hwptr_done >= runtime->buffer_size)
subs->hwptr_done -= runtime->buffer_size;
runtime->delay += offs;
spin_unlock_irqrestore(&subs->lock, flags);
urb->transfer_buffer_length = offs * stride;
if (period_elapsed)
@ -636,12 +637,22 @@ static int prepare_playback_urb(struct snd_usb_substream *subs,
/*
* process after playback data complete
* - nothing to do
* - decrease the delay count again
*/
static int retire_playback_urb(struct snd_usb_substream *subs,
struct snd_pcm_runtime *runtime,
struct urb *urb)
{
unsigned long flags;
int stride = runtime->frame_bits >> 3;
int processed = urb->transfer_buffer_length / stride;
spin_lock_irqsave(&subs->lock, flags);
if (processed > runtime->delay)
runtime->delay = 0;
else
runtime->delay -= processed;
spin_unlock_irqrestore(&subs->lock, flags);
return 0;
}
@ -1520,6 +1531,7 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
subs->hwptr_done = 0;
subs->transfer_done = 0;
subs->phase = 0;
runtime->delay = 0;
/* clear urbs (to be sure) */
deactivate_urbs(subs, 0, 1);