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pcm: add helper functions to query timestamping capabilities

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extend support to link, link_estimated and link_synchronized
timestamp. wall-clock is deprecated

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Pierre-Louis Bossart 2015-07-01 15:40:54 -05:00 • committed by Takashi Iwai
parent 4dc44bb34a
commit 6cb31b4444
2 changed files with 36 additions and 2 deletions
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3
include/pcm.h
View file

@ -668,7 +668,8 @@ int snd_pcm_hw_params_is_half_duplex(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_is_joint_duplex(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_can_sync_start(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_can_disable_period_wakeup(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_supports_audio_wallclock_ts(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_supports_audio_wallclock_ts(const snd_pcm_hw_params_t *params); /* deprecated, use audio_ts_type */
int snd_pcm_hw_params_supports_audio_ts_type(const snd_pcm_hw_params_t *params, int type);
int snd_pcm_hw_params_get_rate_numden(const snd_pcm_hw_params_t *params,
unsigned int *rate_num,
unsigned int *rate_den);

35
src/pcm/pcm.c
View file

@ -3189,13 +3189,46 @@ int snd_pcm_hw_params_can_disable_period_wakeup(const snd_pcm_hw_params_t *param
* a single configuration from the configuration space.
*/
int snd_pcm_hw_params_supports_audio_wallclock_ts(const snd_pcm_hw_params_t *params)
{
/* deprecated */
return snd_pcm_hw_params_supports_audio_ts_type(params,
SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT);
}
/**
* \brief Check if hardware supports type of audio timestamps
* \param params Configuration space
* \param type Audio timestamp type
* \retval 0 Hardware doesn't support type of audio timestamps
* \retval 1 Hardware supports type of audio timestamps
*
* This function should only be called when the configuration space
* contains a single configuration. Call #snd_pcm_hw_params to choose
* a single configuration from the configuration space.
*/
int snd_pcm_hw_params_supports_audio_ts_type(const snd_pcm_hw_params_t *params, int type)
{
assert(params);
if (CHECK_SANITY(params->info == ~0U)) {
SNDMSG("invalid PCM info field");
return 0; /* FIXME: should be a negative error? */
}
return !!(params->info & SNDRV_PCM_INFO_HAS_WALL_CLOCK);
switch (type) {
case SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT:
return !!(params->info & SNDRV_PCM_INFO_HAS_WALL_CLOCK); /* deprecated */
case SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT:
return 1; /* always supported, based on hw_ptr */
case SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK:
return !!(params->info & SNDRV_PCM_INFO_HAS_LINK_ATIME);
case SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_ABSOLUTE:
return !!(params->info & SNDRV_PCM_INFO_HAS_LINK_ABSOLUTE_ATIME);
case SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_ESTIMATED:
return !!(params->info & SNDRV_PCM_INFO_HAS_LINK_ESTIMATED_ATIME);
case SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED:
return !!(params->info & SNDRV_PCM_INFO_HAS_LINK_SYNCHRONIZED_ATIME);
default:
return 0;
}
}
/**