diff options
Diffstat (limited to 'drivers/media/video/cx18/cx18-alsa-pcm.c')
| -rw-r--r-- | drivers/media/video/cx18/cx18-alsa-pcm.c | 156 |
1 files changed, 76 insertions, 80 deletions
diff --git a/drivers/media/video/cx18/cx18-alsa-pcm.c b/drivers/media/video/cx18/cx18-alsa-pcm.c index 2d25c6f92d5..e613826d5a4 100644 --- a/drivers/media/video/cx18/cx18-alsa-pcm.c +++ b/drivers/media/video/cx18/cx18-alsa-pcm.c @@ -47,10 +47,6 @@ MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm"); __func__, ##arg); \ } while (0) -/* Forward Declaration */ -void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data, - size_t num_bytes); - static struct snd_pcm_hardware snd_cx18_hw_capture = { .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | @@ -72,6 +68,82 @@ static struct snd_pcm_hardware snd_cx18_hw_capture = { .periods_max = 98, /* 12544, */ }; +void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data, + size_t num_bytes) +{ + struct snd_pcm_substream *substream; + struct snd_pcm_runtime *runtime; + unsigned int oldptr; + unsigned int stride; + int period_elapsed = 0; + int length; + + dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%d\n", cxsc, + pcm_data, num_bytes); + + substream = cxsc->capture_pcm_substream; + if (substream == NULL) { + dprintk("substream was NULL\n"); + return; + } + + runtime = substream->runtime; + if (runtime == NULL) { + dprintk("runtime was NULL\n"); + return; + } + + stride = runtime->frame_bits >> 3; + if (stride == 0) { + dprintk("stride is zero\n"); + return; + } + + length = num_bytes / stride; + if (length == 0) { + dprintk("%s: length was zero\n", __func__); + return; + } + + if (runtime->dma_area == NULL) { + dprintk("dma area was NULL - ignoring\n"); + return; + } + + oldptr = cxsc->hwptr_done_capture; + if (oldptr + length >= runtime->buffer_size) { + unsigned int cnt = + runtime->buffer_size - oldptr; + memcpy(runtime->dma_area + oldptr * stride, pcm_data, + cnt * stride); + memcpy(runtime->dma_area, pcm_data + cnt * stride, + length * stride - cnt * stride); + } else { + memcpy(runtime->dma_area + oldptr * stride, pcm_data, + length * stride); + } + snd_pcm_stream_lock(substream); + + cxsc->hwptr_done_capture += length; + if (cxsc->hwptr_done_capture >= + runtime->buffer_size) + cxsc->hwptr_done_capture -= + runtime->buffer_size; + + cxsc->capture_transfer_done += length; + if (cxsc->capture_transfer_done >= + runtime->period_size) { + cxsc->capture_transfer_done -= + runtime->period_size; + period_elapsed = 1; + } + + snd_pcm_stream_unlock(substream); + + if (period_elapsed) + snd_pcm_period_elapsed(substream); +} + static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream) { struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); @@ -245,82 +317,6 @@ static struct snd_pcm_ops snd_cx18_pcm_capture_ops = { .page = snd_pcm_get_vmalloc_page, }; -void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data, - size_t num_bytes) -{ - struct snd_pcm_substream *substream; - struct snd_pcm_runtime *runtime; - unsigned int oldptr; - unsigned int stride; - int period_elapsed = 0; - int length; - - dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%d\n", cxsc, - pcm_data, num_bytes); - - substream = cxsc->capture_pcm_substream; - if (substream == NULL) { - dprintk("substream was NULL\n"); - return; - } - - runtime = substream->runtime; - if (runtime == NULL) { - dprintk("runtime was NULL\n"); - return; - } - - stride = runtime->frame_bits >> 3; - if (stride == 0) { - dprintk("stride is zero\n"); - return; - } - - length = num_bytes / stride; - if (length == 0) { - dprintk("%s: length was zero\n", __func__); - return; - } - - if (runtime->dma_area == NULL) { - dprintk("dma area was NULL - ignoring\n"); - return; - } - - oldptr = cxsc->hwptr_done_capture; - if (oldptr + length >= runtime->buffer_size) { - unsigned int cnt = - runtime->buffer_size - oldptr; - memcpy(runtime->dma_area + oldptr * stride, pcm_data, - cnt * stride); - memcpy(runtime->dma_area, pcm_data + cnt * stride, - length * stride - cnt * stride); - } else { - memcpy(runtime->dma_area + oldptr * stride, pcm_data, - length * stride); - } - snd_pcm_stream_lock(substream); - - cxsc->hwptr_done_capture += length; - if (cxsc->hwptr_done_capture >= - runtime->buffer_size) - cxsc->hwptr_done_capture -= - runtime->buffer_size; - - cxsc->capture_transfer_done += length; - if (cxsc->capture_transfer_done >= - runtime->period_size) { - cxsc->capture_transfer_done -= - runtime->period_size; - period_elapsed = 1; - } - - snd_pcm_stream_unlock(substream); - - if (period_elapsed) - snd_pcm_period_elapsed(substream); -} - int snd_cx18_pcm_create(struct snd_cx18_card *cxsc) { struct snd_pcm *sp; |