linux-2.6.33/snd_pcm_lib_ready_transfer() の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-2.6.33/snd_pcm_lib_ready_transfer() へ行く。
• linux-2.6.33/snd_pcm_lib_ready_transfer() の差分を削除

*参照元 [#o9465765]
#backlinks

*説明 [#gf657628]
-パス: [[linux-2.6.33/sound/core/pcm_lib.c]]

-FIXME: これは何？
--説明


**引数 [#f9aee086]
-struct snd_pcm_substream *substream
--
--[[linux-2.6.33/snd_pcm_substream]]
-unsigned int hwoff
--
-unsigned long data
--
-unsigned int off
--
-snd_pcm_uframes_t frames
--
--[[linux-2.6.33/snd_pcm_uframes_t]]


**返り値 [#qd17c367]
-int
--


**参考 [#a25e8913]


*実装 [#wcd41e48]
 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
 				      unsigned int hwoff,
 				      unsigned long data, unsigned int off,
 				      snd_pcm_uframes_t frames)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	int err;
 	void __user **bufs = (void __user **)data;
 	int channels = runtime->channels;
 	int c;
-
--[[linux-2.6.33/snd_pcm_runtime]]

 	if (substream->ops->copy) {
 		for (c = 0; c < channels; ++c, ++bufs) {
 			char __user *buf;
 			if (*bufs == NULL)
 				continue;
 			buf = *bufs + samples_to_bytes(runtime, off);
 			if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
 				return err;
 		}
-
--substream->ops は snd_pcm_ops 型のメンバ
--[[linux-2.6.33/snd_pcm_ops]]
-
--[[linux-2.6.33/samples_to_bytes()]]

 	} else {
 		snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
-
--[[linux-2.6.33/snd_pcm_uframes_t]]

 		for (c = 0; c < channels; ++c, ++bufs) {
 			char *hwbuf;
 			char __user *buf;
 			if (*bufs == NULL)
 				continue;
 
 			hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
 			buf = *bufs + samples_to_bytes(runtime, off);
 			if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
 				return -EFAULT;
 		}
-
--[[linux-2.6.33/copy_to_user()]]

 	}
 	return 0;
 }


*コメント [#n15f49c0]