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ALSA: USB-audio: Break out copying to urb from prepare_playback_urb()

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Refactoring in preparation for adding Zoom R16/24 quirk.
No functional change.

Signed-off-by: Ricard Wanderlof <ricardw@axis.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Ricard Wanderlof 2015-10-19 08:52:49 +02:00 committed by Takashi Iwai
parent 759a2f40c9
commit 07a40c2fc6
1 changed files with 21 additions and 14 deletions
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35
sound/usb/pcm.c
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@ -1385,6 +1385,26 @@ static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
}
}
static void copy_to_urb(struct snd_usb_substream *subs,
struct urb *urb, int stride, unsigned int bytes)
{
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
/* err, the transferred area goes over buffer boundary. */
unsigned int bytes1 =
runtime->buffer_size * stride - subs->hwptr_done;
memcpy(urb->transfer_buffer,
runtime->dma_area + subs->hwptr_done, bytes1);
memcpy(urb->transfer_buffer + bytes1,
runtime->dma_area, bytes - bytes1);
} else {
memcpy(urb->transfer_buffer,
runtime->dma_area + subs->hwptr_done, bytes);
}
subs->hwptr_done += bytes;
}
static void prepare_playback_urb(struct snd_usb_substream *subs,
struct urb *urb)
{
@ -1462,20 +1482,7 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
subs->hwptr_done += bytes;
} else {
/* usual PCM */
if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
/* err, the transferred area goes over buffer boundary. */
unsigned int bytes1 =
runtime->buffer_size * stride - subs->hwptr_done;
memcpy(urb->transfer_buffer,
runtime->dma_area + subs->hwptr_done, bytes1);
memcpy(urb->transfer_buffer + bytes1,
runtime->dma_area, bytes - bytes1);
} else {
memcpy(urb->transfer_buffer,
runtime->dma_area + subs->hwptr_done, bytes);
}
subs->hwptr_done += bytes;
copy_to_urb(subs, urb, stride, bytes);
}
if (subs->hwptr_done >= runtime->buffer_size * stride)