pcm_rate: Do not discard slave reported delay in status result.

snd_pcm_rate_status() gets the underlying status from the slave PCM.
This may contain a delay value that includes elements such as codec and
other transfer delays. Use this as the base for the returned delay
value, adjusted for any frames buffered locally (within the rate
plugin).

Also update snd_pcm_rate_delay() similarly.

[fixed some comments by tiwai]

Signed-off-by: Alan Young <consult.awy@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 44 insertions, 6 deletions

diff --git a/src/pcm/pcm_rate.c b/src/pcm/pcm_rate.c
index 6184defb..1f830dd7 100644
--- a/src/pcm/pcm_rate.c
+++ b/src/pcm/pcm_rate.c
@@ -559,10 +559,9 @@ snd_pcm_rate_read_areas1(snd_pcm_t *pcm,
 		   pcm->channels, rate);
 }
 
-static inline void snd_pcm_rate_sync_hwptr(snd_pcm_t *pcm)
+static inline void snd_pcm_rate_sync_hwptr0(snd_pcm_t *pcm, snd_pcm_uframes_t slave_hw_ptr)
 {
 	snd_pcm_rate_t *rate = pcm->private_data;
-	snd_pcm_uframes_t slave_hw_ptr = *rate->gen.slave->hw.ptr;
 
 	if (pcm->stream != SND_PCM_STREAM_PLAYBACK)
 		return;
@@ -576,6 +575,12 @@ static inline void snd_pcm_rate_sync_hwptr(snd_pcm_t *pcm)
 	rate->hw_ptr %= pcm->boundary;
 }
 
+static inline void snd_pcm_rate_sync_hwptr(snd_pcm_t *pcm)
+{
+	snd_pcm_rate_t *rate = pcm->private_data;
+	snd_pcm_rate_sync_hwptr0(pcm, *rate->gen.slave->hw.ptr);
+}
+
 static int snd_pcm_rate_hwsync(snd_pcm_t *pcm)
 {
 	snd_pcm_rate_t *rate = pcm->private_data;
@@ -586,10 +591,37 @@ static int snd_pcm_rate_hwsync(snd_pcm_t *pcm)
 	return 0;
 }
 
+static snd_pcm_uframes_t snd_pcm_rate_playback_internal_delay(snd_pcm_t *pcm)
+{
+	snd_pcm_rate_t *rate = pcm->private_data;
+
+	if (rate->appl_ptr < rate->last_commit_ptr) {
+		return rate->appl_ptr - rate->last_commit_ptr + pcm->boundary;
+	} else {
+		return rate->appl_ptr - rate->last_commit_ptr;
+	}
+}
+
 static int snd_pcm_rate_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delayp)
 {
+	snd_pcm_rate_t *rate = pcm->private_data;
+	snd_pcm_sframes_t slave_delay;
+	int err;
+
 	snd_pcm_rate_hwsync(pcm);
-	*delayp = snd_pcm_mmap_hw_avail(pcm);
+
+	err = snd_pcm_delay(rate->gen.slave, &slave_delay);
+	if (err < 0) {
+		return err;
+	}
+
+	if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
+		*delayp = rate->ops.input_frames(rate->obj, slave_delay)
+				+ snd_pcm_rate_playback_internal_delay(pcm);
+	} else {
+		*delayp = rate->ops.output_frames(rate->obj, slave_delay)
+				+ snd_pcm_mmap_capture_hw_avail(pcm);
+	}
 	return 0;
 }
 
@@ -1083,15 +1115,21 @@ static int snd_pcm_rate_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
 			status->state = SND_PCM_STATE_RUNNING;
 		status->trigger_tstamp = rate->trigger_tstamp;
 	}
-	snd_pcm_rate_sync_hwptr(pcm);
+	snd_pcm_rate_sync_hwptr0(pcm, status->hw_ptr);
 	status->appl_ptr = *pcm->appl.ptr;
 	status->hw_ptr = *pcm->hw.ptr;
 	if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
-		status->delay = snd_pcm_mmap_playback_hw_avail(pcm);
+		status->delay = rate->ops.input_frames(rate->obj, status->delay)
+					+ snd_pcm_rate_playback_internal_delay(pcm);
 		status->avail = snd_pcm_mmap_playback_avail(pcm);
 		status->avail_max = rate->ops.input_frames(rate->obj, status->avail_max);
 	} else {
-		status->delay = snd_pcm_mmap_capture_hw_avail(pcm);
+		/* FIXME: Maybe possible to somthing similar to
+		 * snd_pcm_rate_playback_internal_delay()
+		 * for the capture case.
+		 */
+		status->delay = rate->ops.output_frames(rate->obj, status->delay)
+					+ snd_pcm_mmap_capture_hw_avail(pcm);
 		status->avail = snd_pcm_mmap_capture_avail(pcm);
 		status->avail_max = rate->ops.output_frames(rate->obj, status->avail_max);
 	}