linux-2.6.33/snd_pcm_update_hw_ptr_post()

参照元†

• linux-2.6.33/snd_pcm_update_hw_ptr()
• linux-2.6.33/snd_pcm_update_hw_ptr_interrupt()

説明†

• パス: linux-2.6.33/sound/core/pcm_lib.c

• FIXME: これは何？
  • 説明

引数†

• struct snd_pcm_substream *substream
  • linux-2.6.33/snd_pcm_substream
• struct snd_pcm_runtime *runtime
  • linux-2.6.33/snd_pcm_runtime

返り値†

• int

参考†

実装†

static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
				      struct snd_pcm_runtime *runtime)
{
	snd_pcm_uframes_t avail;

• • linux-2.6.33/snd_pcm_uframes_t

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		avail = snd_pcm_playback_avail(runtime);
	else
		avail = snd_pcm_capture_avail(runtime);

• • linux-2.6.33/snd_pcm_playback_avail()

• linux-2.6.33/snd_pcm_capture_avail()

	if (avail > runtime->avail_max)
		runtime->avail_max = avail;
	if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
		if (avail >= runtime->buffer_size) {
			snd_pcm_drain_done(substream);
			return -EPIPE;
		}

• • linux-2.6.33/snd_pcm_drain_done()

	} else {
		if (avail >= runtime->stop_threshold) {
			xrun(substream);
			return -EPIPE;
		}
	}

• • linux-2.6.33/xrun()

	if (avail >= runtime->control->avail_min)
		wake_up(&runtime->sleep);

• • linux-2.6.33/wake_up()

	return 0;
}

コメント†

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• katsuhiro

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