Commit 3179f620 authored by Pierre-Louis Bossart's avatar Pierre-Louis Bossart Committed by Takashi Iwai
Browse files

ALSA: core: add .get_time_info 



Introduce more generic .get_time_info to retrieve
system timestamp and audio timestamp in single routine.
Backwards compatibility is preserved with same functionality
as with .wall_clock method (to be removed in following commits
to avoid breaking git bisect)

Signed-off-by: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 5442a73a

include/sound/pcm.h

+4 −0
Original line number Diff line number Diff line
@@ -76,6 +76,10 @@ struct snd_pcm_ops { 
	snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);

	int (*wall_clock)(struct snd_pcm_substream *substream,

			  struct timespec *audio_ts);

	int (*get_time_info)(struct snd_pcm_substream *substream,

			struct timespec *system_ts, struct timespec *audio_ts,

			struct snd_pcm_audio_tstamp_config *audio_tstamp_config,

			struct snd_pcm_audio_tstamp_report *audio_tstamp_report);

	int (*copy)(struct snd_pcm_substream *substream, int channel,

		    snd_pcm_uframes_t pos,

		    void __user *buf, snd_pcm_uframes_t count);

sound/core/pcm_lib.c

+59 −29
Original line number Diff line number Diff line
@@ -232,6 +232,49 @@ int snd_pcm_update_state(struct snd_pcm_substream *substream, 
	return 0;

}



static void update_audio_tstamp(struct snd_pcm_substream *substream,

				struct timespec *curr_tstamp,

				struct timespec *audio_tstamp)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	u64 audio_frames, audio_nsecs;

	struct timespec driver_tstamp;



	if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)

		return;



	if (!(substream->ops->get_time_info) ||

		(runtime->audio_tstamp_report.actual_type ==

			SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {



		/*

		 * provide audio timestamp derived from pointer position

		 * add delay only if requested

		 */



		audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;



		if (runtime->audio_tstamp_config.report_delay) {

			if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)

				audio_frames -=  runtime->delay;

			else

				audio_frames +=  runtime->delay;

		}

		audio_nsecs = div_u64(audio_frames * 1000000000LL,

				runtime->rate);

		*audio_tstamp = ns_to_timespec(audio_nsecs);

	}

	runtime->status->audio_tstamp = *audio_tstamp;

	runtime->status->tstamp = *curr_tstamp;



	/*

	 * re-take a driver timestamp to let apps detect if the reference tstamp

	 * read by low-level hardware was provided with a delay

	 */

	snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);

	runtime->driver_tstamp = driver_tstamp;

}



static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,

				  unsigned int in_interrupt)

{
@@ -256,11 +299,18 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, 
	pos = substream->ops->pointer(substream);

	curr_jiffies = jiffies;

	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {

		if ((substream->ops->get_time_info) &&

			(runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {

			substream->ops->get_time_info(substream, &curr_tstamp,

						&audio_tstamp,

						&runtime->audio_tstamp_config,

						&runtime->audio_tstamp_report);



			/* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */

			if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)

				snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);

		} else

			snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);



		if ((runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) &&

			(substream->ops->wall_clock))

			substream->ops->wall_clock(substream, &audio_tstamp);

	}



	if (pos == SNDRV_PCM_POS_XRUN) {
@@ -403,8 +453,10 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, 
	}



 no_delta_check:

	if (runtime->status->hw_ptr == new_hw_ptr)

	if (runtime->status->hw_ptr == new_hw_ptr) {

		update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);

		return 0;

	}



	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&

	    runtime->silence_size > 0)
@@ -426,30 +478,8 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, 
		snd_BUG_ON(crossed_boundary != 1);

		runtime->hw_ptr_wrap += runtime->boundary;

	}

	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {

		runtime->status->tstamp = curr_tstamp;



		if (!(runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)) {

			/*

			 * no wall clock available, provide audio timestamp

			 * derived from pointer position+delay

			 */

			u64 audio_frames, audio_nsecs;



			if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)

				audio_frames = runtime->hw_ptr_wrap

					+ runtime->status->hw_ptr

					- runtime->delay;

			else

				audio_frames = runtime->hw_ptr_wrap

					+ runtime->status->hw_ptr

					+ runtime->delay;

			audio_nsecs = div_u64(audio_frames * 1000000000LL,

					runtime->rate);

			audio_tstamp = ns_to_timespec(audio_nsecs);

		}

		runtime->status->audio_tstamp = audio_tstamp;

	}

	update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);



	return snd_pcm_update_state(substream, runtime);

}

sound/core/pcm_native.c

+24 −0
Original line number Diff line number Diff line
@@ -707,6 +707,23 @@ int snd_pcm_status(struct snd_pcm_substream *substream, 
	struct snd_pcm_runtime *runtime = substream->runtime;



	snd_pcm_stream_lock_irq(substream);



	snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,

					&runtime->audio_tstamp_config);



	/* backwards compatible behavior */

	if (runtime->audio_tstamp_config.type_requested ==

		SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {

		if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)

			runtime->audio_tstamp_config.type_requested =

				SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;

		else

			runtime->audio_tstamp_config.type_requested =

				SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;

		runtime->audio_tstamp_report.valid = 0;

	} else

		runtime->audio_tstamp_report.valid = 1;



	status->state = runtime->status->state;

	status->suspended_state = runtime->status->suspended_state;

	if (status->state == SNDRV_PCM_STATE_OPEN)
@@ -716,8 +733,15 @@ int snd_pcm_status(struct snd_pcm_substream *substream, 
		snd_pcm_update_hw_ptr(substream);

		if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {

			status->tstamp = runtime->status->tstamp;

			status->driver_tstamp = runtime->driver_tstamp;

			status->audio_tstamp =

				runtime->status->audio_tstamp;

			if (runtime->audio_tstamp_report.valid == 1)

				/* backwards compatibility, no report provided in COMPAT mode */

				snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,

								&status->audio_tstamp_accuracy,

								&runtime->audio_tstamp_report);



			goto _tstamp_end;

		}

	} else {

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