openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

V4L/DVB: tm6000-alsa: Implement a routine to store data received from URB 

Implements the fillbuf callback to store data received via URB
data transfers.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2010-06-05 19:21:34 -03:00
parent 3f23a81a10
commit e8cbf0357e
1 changed files with 42 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
drivers/staging/tm6000/tm6000-alsa.c
View File

@ -158,16 +158,16 @@ static struct snd_pcm_hardware snd_tm6000_digital_hw = {
SNDRV_PCM_INFO_MMAP_VALID,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
.rate_min = 44100,
.rates = SNDRV_PCM_RATE_48000,
.rate_min = 48000,
.rate_max = 48000,
.channels_min = 2,
.channels_max = 2,
.period_bytes_min = DEFAULT_FIFO_SIZE/4,
.period_bytes_max = DEFAULT_FIFO_SIZE/4,
.period_bytes_min = 62720,
.period_bytes_max = 62720,
.periods_min = 1,
.periods_max = 1024,
.buffer_bytes_max = (1024*1024),
.buffer_bytes_max = 62720 * 8,
};
/*
@ -204,15 +204,45 @@ static int snd_tm6000_close(struct snd_pcm_substream *substream)
static int tm6000_fillbuf(struct tm6000_core *core, char *buf, int size)
{
int i;
struct snd_tm6000_card *chip = core->adev;
struct snd_pcm_substream *substream = chip->substream;
struct snd_pcm_runtime *runtime;
int period_elapsed = 0;
unsigned int stride, buf_pos;
/* Need to add a real code to copy audio buffer */
printk("Audio (%i bytes): ", size);
for (i = 0; i < size - 3; i +=4)
printk("(0x%04x, 0x%04x), ",
*(u16 *)(buf + i), *(u16 *)(buf + i + 2));
if (!size || !substream)
return -EINVAL;
printk("\n");
runtime = substream->runtime;
if (!runtime || !runtime->dma_area)
return -EINVAL;
buf_pos = chip->buf_pos;
stride = runtime->frame_bits >> 3;
dprintk(1, "Copying %d bytes at %p[%d] - buf size=%d x %d\n", size,
runtime->dma_area, buf_pos,
(unsigned int)runtime->buffer_size, stride);
if (buf_pos + size >= runtime->buffer_size * stride) {
unsigned int cnt = runtime->buffer_size * stride - buf_pos;
memcpy(runtime->dma_area + buf_pos, buf, cnt);
memcpy(runtime->dma_area, buf + cnt, size - cnt);
} else
memcpy(runtime->dma_area + buf_pos, buf, size);
chip->buf_pos += size;
if (chip->buf_pos >= runtime->buffer_size * stride)
chip->buf_pos -= runtime->buffer_size * stride;
chip->period_pos += size;
if (chip->period_pos >= runtime->period_size) {
chip->period_pos -= runtime->period_size;
period_elapsed = 1;
}
if (period_elapsed)
snd_pcm_period_elapsed(substream);
return 0;
}