Implement missing htimestamp callbacks

Implemented the missing htimestamp callbacks for ioplug, rate and null
plugins.

src/pcm/pcm_generic.c

@@ -266,6 +266,28 @@ int snd_pcm_generic_htimestamp(snd_pcm_t *pcm, snd_pcm_uframes_t *avail,
 	return snd_pcm_htimestamp(generic->slave, avail, tstamp);
 }
 
+/* stand-alone version - similar like snd_pcm_hw_htimestamp but
+ * taking the tstamp via gettimestamp().
+ */
+int snd_pcm_generic_real_htimestamp(snd_pcm_t *pcm, snd_pcm_uframes_t *avail,
+				    snd_htimestamp_t *tstamp)
+{
+	snd_pcm_sframes_t avail1;
+	int ok = 0;
+
+	while (1) {
+		avail1 = snd_pcm_avail_update(pcm);
+		if (avail1 < 0)
+			return avail1;
+		if (ok && (snd_pcm_uframes_t)avail1 == *avail)
+			break;
+		*avail = avail1;
+		gettimestamp(tstamp, pcm->monotonic);
+		ok = 1;
+	}
+	return 0;
+}
+
 int snd_pcm_generic_mmap(snd_pcm_t *pcm)
 {
 	if (pcm->mmap_shadow) {

src/pcm/pcm_generic.h

@@ -139,5 +139,7 @@ snd_pcm_sframes_t snd_pcm_generic_mmap_commit(snd_pcm_t *pcm,
 snd_pcm_sframes_t snd_pcm_generic_avail_update(snd_pcm_t *pcm);
 int snd_pcm_generic_htimestamp(snd_pcm_t *pcm, snd_pcm_uframes_t *avail,
 			       snd_htimestamp_t *timestamp);
+int snd_pcm_generic_real_htimestamp(snd_pcm_t *pcm, snd_pcm_uframes_t *avail,
+				    snd_htimestamp_t *tstamp);
 int snd_pcm_generic_mmap(snd_pcm_t *pcm);
 int snd_pcm_generic_munmap(snd_pcm_t *pcm);

src/pcm/pcm_ioplug.c

@@ -29,6 +29,7 @@
 #include "pcm_local.h"
 #include "pcm_ioplug.h"
 #include "pcm_ext_parm.h"
+#include "pcm_generic.h"
 
 #ifndef PIC
 /* entry for static linking */
@@ -636,13 +637,6 @@ static snd_pcm_sframes_t snd_pcm_ioplug_avail_update(snd_pcm_t *pcm)
 	return (snd_pcm_sframes_t)avail;
 }
 
-static int snd_pcm_ioplug_htimestamp(snd_pcm_t *pcm ATTRIBUTE_UNUSED,
-				     snd_pcm_uframes_t *avail ATTRIBUTE_UNUSED,
-				     snd_htimestamp_t *tstamp ATTRIBUTE_UNUSED)
-{
-	return -EIO;	/* not implemented yet */
-}
-
 static int snd_pcm_ioplug_nonblock(snd_pcm_t *pcm, int nonblock)
 {
 	ioplug_priv_t *io = pcm->private_data;
@@ -781,7 +775,7 @@ static snd_pcm_fast_ops_t snd_pcm_ioplug_fast_ops = {
 	.readn = snd_pcm_ioplug_readn,
 	.avail_update = snd_pcm_ioplug_avail_update,
 	.mmap_commit = snd_pcm_ioplug_mmap_commit,
-	.htimestamp = snd_pcm_ioplug_htimestamp,
+	.htimestamp = snd_pcm_generic_real_htimestamp,
 	.poll_descriptors_count = snd_pcm_ioplug_poll_descriptors_count,
 	.poll_descriptors = snd_pcm_ioplug_poll_descriptors,
 	.poll_revents = snd_pcm_ioplug_poll_revents,

src/pcm/pcm_null.c

@@ -244,13 +244,6 @@ static snd_pcm_sframes_t snd_pcm_null_avail_update(snd_pcm_t *pcm)
 	return pcm->buffer_size;
 }
 
-static int snd_pcm_null_htimestamp(snd_pcm_t *pcm ATTRIBUTE_UNUSED,
-				   snd_pcm_uframes_t *avail ATTRIBUTE_UNUSED,
-				   snd_htimestamp_t *tstamp ATTRIBUTE_UNUSED)
-{
-	return -EIO;
-}
-
 static int snd_pcm_null_hw_refine(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params)
 {
 	int err = snd_pcm_hw_refine_soft(pcm, params);
@@ -319,7 +312,7 @@ static snd_pcm_fast_ops_t snd_pcm_null_fast_ops = {
 	.readn = snd_pcm_null_readn,
 	.avail_update = snd_pcm_null_avail_update,
 	.mmap_commit = snd_pcm_null_mmap_commit,
-	.htimestamp = snd_pcm_null_htimestamp,
+	.htimestamp = snd_pcm_generic_real_htimestamp,
 };
 
 /**

src/pcm/pcm_rate.c

@@ -1020,11 +1020,30 @@ static snd_pcm_sframes_t snd_pcm_rate_avail_update(snd_pcm_t *pcm)
  }
 }
 
-static int snd_pcm_rate_htimestamp(snd_pcm_t *pcm ATTRIBUTE_UNUSED,
+static int snd_pcm_rate_htimestamp(snd_pcm_t *pcm,
-				   snd_pcm_uframes_t *avail ATTRIBUTE_UNUSED,
+				   snd_pcm_uframes_t *avail,
-				   snd_htimestamp_t *tstamp ATTRIBUTE_UNUSED)
+				   snd_htimestamp_t *tstamp)
 {
-	return -EIO; /* not implemented yet */
+	snd_pcm_rate_t *rate = pcm->private_data;
+	snd_pcm_sframes_t avail1;
+	snd_pcm_uframes_t tmp;
+	int ok = 0, err;
+
+	while (1) {
+		/* the position is from this plugin itself */
+		avail1 = snd_pcm_avail_update(pcm);
+		if (avail1 < 0)
+			return avail1;
+		if (ok && (snd_pcm_uframes_t)avail1 == *avail)
+			break;
+		*avail = avail1;
+		/* timestamp is taken from the slave PCM */
+		err = snd_pcm_htimestamp(rate->gen.slave, &tmp, tstamp);
+		if (err < 0)
+			return err;
+		ok = 1;
+	}
+	return 0;
 }
 
 static int snd_pcm_rate_poll_revents(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int nfds, unsigned short *revents)