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

* topic/pcm-delay:
  ALSA: usbaudio - Add delay account
  ALSA: Add extra delay count in PCM

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 0caf71e..2092274 100644 (file)
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -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 */

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index b5da656..45dc53f 100644 (file)
--- 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;
        }
@@ -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;

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index a6b8848..a8ef2cb 100644 (file)
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -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);