Commit e0327a0f authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: pcm: Simplify forward/rewind codes 



Factor out the common codes in snd_pcm_*_forward() and *_rewind()
functions to simplify the codes.  No functional changes.

Reviewd-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent f839cc1c

sound/core/pcm_native.c

+50 −68
Original line number Diff line number Diff line
@@ -2455,34 +2455,58 @@ static int do_pcm_hwsync(struct snd_pcm_substream *substream) 
	}

}



/* increase the appl_ptr; returns the processed frames */

static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,

					  snd_pcm_uframes_t frames,

					   snd_pcm_sframes_t avail)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_pcm_sframes_t appl_ptr;



	if (avail <= 0)

		return 0;

	if (frames > (snd_pcm_uframes_t)avail)

		frames = avail;

	appl_ptr = runtime->control->appl_ptr + frames;

	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)

		appl_ptr -= runtime->boundary;

	runtime->control->appl_ptr = appl_ptr;

	return frames;

}



/* decrease the appl_ptr; returns the processed frames */

static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,

					 snd_pcm_uframes_t frames,

					 snd_pcm_sframes_t avail)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_pcm_sframes_t appl_ptr;



	if (avail <= 0)

		return 0;

	if (frames > (snd_pcm_uframes_t)avail)

		frames = avail;

	appl_ptr = runtime->control->appl_ptr - frames;

	if (appl_ptr < 0)

		appl_ptr += runtime->boundary;

	runtime->control->appl_ptr = appl_ptr;

	return frames;

}



static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,

						 snd_pcm_uframes_t frames)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_pcm_sframes_t appl_ptr;

	snd_pcm_sframes_t ret;

	snd_pcm_sframes_t hw_avail;



	if (frames == 0)

		return 0;



	snd_pcm_stream_lock_irq(substream);

	ret = do_pcm_hwsync(substream);

	if (ret < 0)

		goto __end;

	hw_avail = snd_pcm_playback_hw_avail(runtime);

	if (hw_avail <= 0) {

		ret = 0;

		goto __end;

	}

	if (frames > (snd_pcm_uframes_t)hw_avail)

		frames = hw_avail;

	appl_ptr = runtime->control->appl_ptr - frames;

	if (appl_ptr < 0)

		appl_ptr += runtime->boundary;

	runtime->control->appl_ptr = appl_ptr;

	ret = frames;

 __end:

	if (!ret)

		ret = rewind_appl_ptr(substream, frames,

				      snd_pcm_playback_hw_avail(runtime));

	snd_pcm_stream_unlock_irq(substream);

	return ret;

}
@@ -2491,30 +2515,16 @@ static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substr 
						snd_pcm_uframes_t frames)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_pcm_sframes_t appl_ptr;

	snd_pcm_sframes_t ret;

	snd_pcm_sframes_t hw_avail;



	if (frames == 0)

		return 0;



	snd_pcm_stream_lock_irq(substream);

	ret = do_pcm_hwsync(substream);

	if (ret < 0)

		goto __end;

	hw_avail = snd_pcm_capture_hw_avail(runtime);

	if (hw_avail <= 0) {

		ret = 0;

		goto __end;

	}

	if (frames > (snd_pcm_uframes_t)hw_avail)

		frames = hw_avail;

	appl_ptr = runtime->control->appl_ptr - frames;

	if (appl_ptr < 0)

		appl_ptr += runtime->boundary;

	runtime->control->appl_ptr = appl_ptr;

	ret = frames;

 __end:

	if (!ret)

		ret = rewind_appl_ptr(substream, frames,

				      snd_pcm_capture_hw_avail(runtime));

	snd_pcm_stream_unlock_irq(substream);

	return ret;

}
@@ -2523,30 +2533,16 @@ static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *subs 
						  snd_pcm_uframes_t frames)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_pcm_sframes_t appl_ptr;

	snd_pcm_sframes_t ret;

	snd_pcm_sframes_t avail;



	if (frames == 0)

		return 0;



	snd_pcm_stream_lock_irq(substream);

	ret = do_pcm_hwsync(substream);

	if (ret < 0)

		goto __end;

	avail = snd_pcm_playback_avail(runtime);

	if (avail <= 0) {

		ret = 0;

		goto __end;

	}

	if (frames > (snd_pcm_uframes_t)avail)

		frames = avail;

	appl_ptr = runtime->control->appl_ptr + frames;

	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)

		appl_ptr -= runtime->boundary;

	runtime->control->appl_ptr = appl_ptr;

	ret = frames;

 __end:

	if (!ret)

		ret = forward_appl_ptr(substream, frames,

				       snd_pcm_playback_avail(runtime));

	snd_pcm_stream_unlock_irq(substream);

	return ret;

}
@@ -2555,30 +2551,16 @@ static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *subst 
						 snd_pcm_uframes_t frames)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_pcm_sframes_t appl_ptr;

	snd_pcm_sframes_t ret;

	snd_pcm_sframes_t avail;



	if (frames == 0)

		return 0;



	snd_pcm_stream_lock_irq(substream);

	ret = do_pcm_hwsync(substream);

	if (ret < 0)

		goto __end;

	avail = snd_pcm_capture_avail(runtime);

	if (avail <= 0) {

		ret = 0;

		goto __end;

	}

	if (frames > (snd_pcm_uframes_t)avail)

		frames = avail;

	appl_ptr = runtime->control->appl_ptr + frames;

	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)

		appl_ptr -= runtime->boundary;

	runtime->control->appl_ptr = appl_ptr;

	ret = frames;

 __end:

	if (!ret)

		ret = forward_appl_ptr(substream, frames,

				       snd_pcm_capture_avail(runtime));

	snd_pcm_stream_unlock_irq(substream);

	return ret;

}

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