pcm: rewindable, forwardable: don't return stale data

The current behavior of snd_pcm_rewindable and snd_pcm_forwardable means
that the returned value is only accurate to one period. Or maybe even
meaningless if period interrupts are off. Fetch the up-to-date position
of the hardware pointer, as that's what is wanted by callers.

Signed-off-by: Alexander E. Patrakov <patrakov@gmail.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

src/pcm/pcm_dmix.c

@@ -661,6 +661,9 @@ static int snd_pcm_dmix_pause(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int enable ATTRIB
 
 static snd_pcm_sframes_t snd_pcm_dmix_rewindable(snd_pcm_t *pcm)
 {
+	int err = snd_pcm_dmix_hwsync(pcm);
+	if (err < 0)
+		return err;
 	return snd_pcm_mmap_playback_hw_rewindable(pcm);
 }
 
@@ -744,6 +747,9 @@ static snd_pcm_sframes_t snd_pcm_dmix_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t f
 
 static snd_pcm_sframes_t snd_pcm_dmix_forwardable(snd_pcm_t *pcm)
 {
+	int err = snd_pcm_dmix_hwsync(pcm);
+	if (err < 0)
+		return err;
 	return snd_pcm_mmap_avail(pcm);
 }
 

src/pcm/pcm_dshare.c

@@ -412,6 +412,9 @@ static int snd_pcm_dshare_pause(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int enable ATTR
 
 static snd_pcm_sframes_t snd_pcm_dshare_rewindable(snd_pcm_t *pcm)
 {
+	int err = snd_pcm_dshare_hwsync(pcm);
+	if (err < 0)
+		return err;
 	return snd_pcm_mmap_playback_hw_rewindable(pcm);
 }
 
@@ -428,6 +431,9 @@ static snd_pcm_sframes_t snd_pcm_dshare_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t
 
 static snd_pcm_sframes_t snd_pcm_dshare_forwardable(snd_pcm_t *pcm)
 {
+	int err = snd_pcm_dshare_hwsync(pcm);
+	if (err < 0)
+		return err;
 	return snd_pcm_mmap_playback_avail(pcm);
 }
 

src/pcm/pcm_dsnoop.c

@@ -335,6 +335,9 @@ static int snd_pcm_dsnoop_pause(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int enable ATTR
 
 static snd_pcm_sframes_t snd_pcm_dsnoop_rewindable(snd_pcm_t *pcm)
 {
+	int err = snd_pcm_dsnoop_hwsync(pcm);
+	if (err < 0)
+		return err;
 	return snd_pcm_mmap_capture_hw_avail(pcm);
 }
 
@@ -351,6 +354,9 @@ static snd_pcm_sframes_t snd_pcm_dsnoop_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t
 
 static snd_pcm_sframes_t snd_pcm_dsnoop_forwardable(snd_pcm_t *pcm)
 {
+	int err = snd_pcm_dsnoop_hwsync(pcm);
+	if (err < 0)
+		return err;
 	return snd_pcm_mmap_capture_avail(pcm);
 }
 

src/pcm/pcm_hw.c

@@ -659,6 +659,9 @@ static int snd_pcm_hw_pause(snd_pcm_t *pcm, int enable)
 
 static snd_pcm_sframes_t snd_pcm_hw_rewindable(snd_pcm_t *pcm)
 {
+	int err = snd_pcm_hw_hwsync(pcm);
+	if (err < 0)
+		return err;
 	return snd_pcm_mmap_hw_rewindable(pcm);
 }
 
@@ -679,6 +682,9 @@ static snd_pcm_sframes_t snd_pcm_hw_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t fra
 
 static snd_pcm_sframes_t snd_pcm_hw_forwardable(snd_pcm_t *pcm)
 {
+	int err = snd_pcm_hw_hwsync(pcm);
+	if (err < 0)
+		return err;
 	return snd_pcm_mmap_avail(pcm);
 }
 

src/pcm/pcm_ioplug.c

@@ -503,6 +503,7 @@ static int snd_pcm_ioplug_pause(snd_pcm_t *pcm, int enable)
 
 static snd_pcm_sframes_t snd_pcm_ioplug_rewindable(snd_pcm_t *pcm)
 {
+	snd_pcm_ioplug_hw_ptr_update(pcm);
 	return snd_pcm_mmap_hw_rewindable(pcm);
 }
 
@@ -514,6 +515,7 @@ static snd_pcm_sframes_t snd_pcm_ioplug_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t
 
 static snd_pcm_sframes_t snd_pcm_ioplug_forwardable(snd_pcm_t *pcm)
 {
+	snd_pcm_ioplug_hw_ptr_update(pcm);
 	return snd_pcm_mmap_avail(pcm);
 }
 

src/pcm/pcm_plugin.c

@@ -198,6 +198,9 @@ static int snd_pcm_plugin_reset(snd_pcm_t *pcm)
 
 static snd_pcm_sframes_t snd_pcm_plugin_rewindable(snd_pcm_t *pcm)
 {
+	int err = snd_pcm_generic_hwsync(pcm);
+	if (err < 0)
+		return err;
 	return snd_pcm_mmap_hw_rewindable(pcm);
 }
 
@@ -226,6 +229,9 @@ snd_pcm_sframes_t snd_pcm_plugin_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames
 
 static snd_pcm_sframes_t snd_pcm_plugin_forwardable(snd_pcm_t *pcm)
 {
+	int err = snd_pcm_generic_hwsync(pcm);
+	if (err < 0)
+		return err;
 	return snd_pcm_mmap_avail(pcm);
 }