[alsa-devel] [PATCH 3/3] ALSA: pcm: Add timestamp type to sw_params

[Takashi Iwai]

For allowing adjusting the timestamp type on the fly, add it to
sw_params.  The existing ioctl is still kept for compatibility.

Along with this, increment the PCM protocol version.

The extension was suggested by Clemens Ladisch.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 include/uapi/sound/asound.h | 6 ++++--
 sound/core/pcm_native.c     | 3 +++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index cbf7dc850a46..a7e062f91f39 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -139,7 +139,7 @@ struct snd_hwdep_dsp_image {
  *                                                                           *
  *****************************************************************************/
 
-#define SNDRV_PCM_VERSION		SNDRV_PROTOCOL_VERSION(2, 0, 11)
+#define SNDRV_PCM_VERSION		SNDRV_PROTOCOL_VERSION(2, 0, 12)
 
 typedef unsigned long snd_pcm_uframes_t;
 typedef signed long snd_pcm_sframes_t;
@@ -391,7 +391,9 @@ struct snd_pcm_sw_params {
 	snd_pcm_uframes_t silence_threshold;	/* min distance from noise for silence filling */
 	snd_pcm_uframes_t silence_size;		/* silence block size */
 	snd_pcm_uframes_t boundary;		/* pointers wrap point */
-	unsigned char reserved[64];		/* reserved for future */
+	unsigned int tstamp_type;		/* timestamp type */
+	int pads;				/* alignment, reserved */
+	unsigned char reserved[56];		/* reserved for future */
 };
 
 struct snd_pcm_channel_info {
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 2372c49a8e84..81dedc381efd 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -543,6 +543,8 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 
 	if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 		return -EINVAL;
+	if (params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
+		return -EINVAL;
 	if (params->avail_min == 0)
 		return -EINVAL;
 	if (params->silence_size >= runtime->boundary) {
@@ -557,6 +559,7 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 	err = 0;
 	snd_pcm_stream_lock_irq(substream);
 	runtime->tstamp_mode = params->tstamp_mode;
+	runtime->tstamp_type = params->tstamp_type;
 	runtime->period_step = params->period_step;
 	runtime->control->avail_min = params->avail_min;
 	runtime->start_threshold = params->start_threshold;
-- 
2.0.1