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[media] ivtv-alsa, ivtv: Connect ivtv PCM capture stream to ivtv-alsa interface driver 

This change hooks up the ivtv PCM capture stream to the ivtv-alsa interface
driver.  This is all that should be needed for basic CX23415/CX23416 PCM
audio capture to be available via ALSA device nodes.

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Andy Walls 2012-09-03 14:50:49 -03:00 committed by Mauro Carvalho Chehab
parent 269c11fbac
commit 4313902ebe
2 changed files with 51 additions and 0 deletions
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1
drivers/media/pci/ivtv/ivtv-driver.h
View File

@ -259,6 +259,7 @@ struct ivtv_mailbox_data {
#define IVTV_F_I_DEC_PAUSED 20 /* the decoder is paused */
#define IVTV_F_I_INITED 21 /* set after first open */
#define IVTV_F_I_FAILED 22 /* set if first open failed */
#define IVTV_F_I_WORK_HANDLER_PCM 23 /* there is work to be done for PCM */
/* Event notifications */
#define IVTV_F_I_EV_DEC_STOPPED 28 /* decoder stopped event */

50
drivers/media/pci/ivtv/ivtv-irq.c
View File

@ -38,6 +38,34 @@ static const int ivtv_stream_map[] = {
IVTV_ENC_STREAM_TYPE_VBI,
};
static void ivtv_pcm_work_handler(struct ivtv *itv)
{
struct ivtv_stream *s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
struct ivtv_buffer *buf;
/* Pass the PCM data to ivtv-alsa */
while (1) {
/*
* Users should not be using both the ALSA and V4L2 PCM audio
* capture interfaces at the same time. If the user is doing
* this, there maybe a buffer in q_io to grab, use, and put
* back in rotation.
*/
buf = ivtv_dequeue(s, &s->q_io);
if (buf == NULL)
buf = ivtv_dequeue(s, &s->q_full);
if (buf == NULL)
break;
if (buf->readpos < buf->bytesused)
itv->pcm_announce_callback(itv->alsa,
(u8 *)(buf->buf + buf->readpos),
(size_t)(buf->bytesused - buf->readpos));
ivtv_enqueue(s, buf, &s->q_free);
}
}
static void ivtv_pio_work_handler(struct ivtv *itv)
{
@ -83,6 +111,9 @@ void ivtv_irq_work_handler(struct kthread_work *work)
if (test_and_clear_bit(IVTV_F_I_WORK_HANDLER_YUV, &itv->i_flags))
ivtv_yuv_work_handler(itv);
if (test_and_clear_bit(IVTV_F_I_WORK_HANDLER_PCM, &itv->i_flags))
ivtv_pcm_work_handler(itv);
}
/* Determine the required DMA size, setup enough buffers in the predma queue and
@ -293,7 +324,26 @@ static void dma_post(struct ivtv_stream *s)
return;
}
}
ivtv_queue_move(s, &s->q_dma, NULL, &s->q_full, s->q_dma.bytesused);
if (s->type == IVTV_ENC_STREAM_TYPE_PCM &&
itv->pcm_announce_callback != NULL) {
/*
* Set up the work handler to pass the data to ivtv-alsa.
*
* We just use q_full and let the work handler race with users
* making ivtv-fileops.c calls on the PCM device node.
*
* Users should not be using both the ALSA and V4L2 PCM audio
* capture interfaces at the same time. If the user does this,
* fragments of data will just go out each interface as they
* race for PCM data.
*/
set_bit(IVTV_F_I_WORK_HANDLER_PCM, &itv->i_flags);
set_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags);
}
if (s->fh)
wake_up(&s->waitq);
}