[PATCH alsa-lib 1/2] pcm: Add snd_pcm_audio_tstamp_type_t constants

[Takashi Iwai <tiwai@suse.de>]

From: David Henningsson <diwic@ubuntu.com>

These are mostly a copy-paste from the kernel headers. But since functions
snd_pcm_audio_tstamp_config make use of these they should be added to the
public API as well.

Reported-by: Alex Moon <alex.r.moon@gmail.com>
Signed-off-by: David Henningsson <diwic@ubuntu.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 include/pcm.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/pcm.h b/include/pcm.h
index 5b0782315585..cf1eea8bbc9b 100644
--- a/include/pcm.h
+++ b/include/pcm.h
@@ -350,6 +350,20 @@ typedef enum _snd_pcm_tstamp_type {
 	SND_PCM_TSTAMP_TYPE_LAST = SND_PCM_TSTAMP_TYPE_MONOTONIC_RAW,
 } snd_pcm_tstamp_type_t;
 
+typedef enum _snd_pcm_audio_tstamp_type {
+	/**
+	 * first definition for backwards compatibility only,
+	 * maps to wallclock/link time for HDAudio playback and DEFAULT/DMA time for everything else
+	 */
+	SND_PCM_AUDIO_TSTAMP_TYPE_COMPAT = 0,
+	SND_PCM_AUDIO_TSTAMP_TYPE_DEFAULT = 1,           /**< DMA time, reported as per hw_ptr */
+	SND_PCM_AUDIO_TSTAMP_TYPE_LINK = 2,	           /**< link time reported by sample or wallclock counter, reset on startup */
+	SND_PCM_AUDIO_TSTAMP_TYPE_LINK_ABSOLUTE = 3,	   /**< link time reported by sample or wallclock counter, not reset on startup */
+	SND_PCM_AUDIO_TSTAMP_TYPE_LINK_ESTIMATED = 4,    /**< link time estimated indirectly */
+	SND_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED = 5, /**< link time synchronized with system time */
+	SND_PCM_AUDIO_TSTAMP_TYPE_LAST = SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED
+} snd_pcm_audio_tstamp_type_t;
+
 typedef struct _snd_pcm_audio_tstamp_config {
 	/* 5 of max 16 bits used */
 	unsigned int type_requested:4;
-- 
2.26.2