linux-2.6.33/snd_pcm_open_substream() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-2.6.33/snd_pcm_open_substream() へ行く。
  • 1 (2013-06-20 (木) 20:52:31)

参照元†

説明†

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

• FIXME: これは何？
  • 説明

引数†

• struct snd_pcm *pcm
  • linux-2.6.33/snd_pcm
• int stream
  • [[linux-2.6.33/]]
• struct file *file
  • linux-2.6.33/file
• struct snd_pcm_substream **rsubstream
  • linux-2.6.33/snd_pcm_substream

返り値†

• int

参考†

実装†

int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
			   struct file *file,
			   struct snd_pcm_substream **rsubstream)
{
	struct snd_pcm_substream *substream;
	int err;

	err = snd_pcm_attach_substream(pcm, stream, file, &substream);
	if (err < 0)
		return err;
	if (substream->ref_count > 1) {
		*rsubstream = substream;
		return 0;
	}

	err = snd_pcm_hw_constraints_init(substream);
	if (err < 0) {
		snd_printd("snd_pcm_hw_constraints_init failed\n");
		goto error;
	}

	if ((err = substream->ops->open(substream)) < 0)
		goto error;

	substream->hw_opened = 1;

	err = snd_pcm_hw_constraints_complete(substream);
	if (err < 0) {
		snd_printd("snd_pcm_hw_constraints_complete failed\n");
		goto error;
	}

	*rsubstream = substream;
	return 0;

 error:
	snd_pcm_release_substream(substream);
	return err;
}

EXPORT_SYMBOL(snd_pcm_open_substream);

コメント†