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Commit a9cd29e7 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: pcm: Simplify snd_pcm_playback_silence() 



Use the existing silence helper codes for simplification.

Reviewed-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 5c7264cf

sound/core/pcm_lib.c

+20 −30
Original line number Diff line number Diff line
@@ -44,6 +44,9 @@ 
#define trace_hw_ptr_error(substream, reason)

#endif



static int fill_silence_frames(struct snd_pcm_substream *substream,

			       snd_pcm_uframes_t off, snd_pcm_uframes_t frames);



/*

 * fill ring buffer with silence

 * runtime->silence_start: starting pointer to silence area
@@ -57,7 +60,6 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram 
{

	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_pcm_uframes_t frames, ofs, transfer;

	char *hwbuf;

	int err;



	if (runtime->silence_size < runtime->boundary) {
@@ -111,35 +113,8 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram 
	ofs = runtime->silence_start % runtime->buffer_size;

	while (frames > 0) {

		transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;

		if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||

		    runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {

			if (substream->ops->fill_silence) {

				err = substream->ops->fill_silence(substream, 0,

								   frames_to_bytes(runtime, ofs),

								   frames_to_bytes(runtime, transfer));

				snd_BUG_ON(err < 0);

			} else {

				hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);

				snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);

			}

		} else {

			unsigned int c;

			unsigned int channels = runtime->channels;

			if (substream->ops->fill_silence) {

				for (c = 0; c < channels; ++c) {

					err = substream->ops->fill_silence(substream, c,

									   samples_to_bytes(runtime, ofs),

									   samples_to_bytes(runtime, transfer));

		err = fill_silence_frames(substream, ofs, transfer);

		snd_BUG_ON(err < 0);

				}

			} else {

				size_t dma_csize = runtime->dma_bytes / channels;

				for (c = 0; c < channels; ++c) {

					hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);

					snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);

				}

			}

		}

		runtime->silence_filled += transfer;

		frames -= transfer;

		ofs = 0;
@@ -2103,6 +2078,21 @@ static int noninterleaved_copy(struct snd_pcm_substream *substream, 
	return 0;

}



/* fill silence on the given buffer position;

 * called from snd_pcm_playback_silence()

 */

static int fill_silence_frames(struct snd_pcm_substream *substream,

			       snd_pcm_uframes_t off, snd_pcm_uframes_t frames)

{

	if (substream->runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||

	    substream->runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)

		return interleaved_copy(substream, off, NULL, 0, frames,

					fill_silence);

	else

		return noninterleaved_copy(substream, off, NULL, 0, frames,

					   fill_silence);

}



/* sanity-check for read/write methods */

static int pcm_sanity_check(struct snd_pcm_substream *substream)

{