[alsa-devel] [PATCH] ALSA: usb-audio: support delay calculation on capture streams

[Pierre-Louis Bossart]

Enable delay report on capture path. The delay is reset when an
URB is retired and increment at each call to .pointer based
on frame counter changes. The precision of the delay
information is limited to 1ms as in the playback case.

This reverts commit 3f94fad09538ec988919ec3f371841182df71d04.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/usb/pcm.c |   23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index c659310..3a38447 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -59,7 +59,12 @@ snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
 
 	/* Approximation based on number of samples per USB frame (ms),
 	   some truncation for 44.1 but the estimate is good enough */
-	est_delay =  subs->last_delay - (frame_diff * rate / 1000);
+	est_delay =  frame_diff * rate / 1000;
+	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
+		est_delay = subs->last_delay - est_delay;
+	else
+		est_delay = subs->last_delay + est_delay;
+
 	if (est_delay < 0)
 		est_delay = 0;
 	return est_delay;
@@ -78,8 +83,7 @@ static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream
 		return SNDRV_PCM_POS_XRUN;
 	spin_lock(&subs->lock);
 	hwptr_done = subs->hwptr_done;
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-		substream->runtime->delay = snd_usb_pcm_delay(subs,
+	substream->runtime->delay = snd_usb_pcm_delay(subs,
 						substream->runtime->rate);
 	spin_unlock(&subs->lock);
 	return hwptr_done / (substream->runtime->frame_bits >> 3);
@@ -1147,6 +1151,10 @@ static void retire_capture_urb(struct snd_usb_substream *subs,
 	int i, period_elapsed = 0;
 	unsigned long flags;
 	unsigned char *cp;
+	int current_frame_number;
+
+	/* read frame number here, update pointer in critical section */
+	current_frame_number = usb_get_current_frame_number(subs->dev);
 
 	stride = runtime->frame_bits >> 3;
 
@@ -1180,6 +1188,15 @@ static void retire_capture_urb(struct snd_usb_substream *subs,
 			subs->transfer_done -= runtime->period_size;
 			period_elapsed = 1;
 		}
+		/* capture delay is by construction limited to one URB,
+		 * reset delays here
+		 */
+		runtime->delay = subs->last_delay = 0;
+
+		/* realign last_frame_number */
+		subs->last_frame_number = current_frame_number;
+		subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
+
 		spin_unlock_irqrestore(&subs->lock, flags);
 		/* copy a data chunk */
 		if (oldptr + bytes > runtime->buffer_size * stride) {
-- 
1.7.9.5