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authorAndy Walls <awalls@md.metrocast.net>2012-09-03 14:50:49 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-09-18 13:29:07 -0300
commit4313902ebe33155209472215c62d2f29d117be29 (patch)
tree74bdcb1474e9275359c50e3c58e6636fbc0e0fdd /drivers/media/pci/ivtv
parent269c11fbac4f7b4ed58e77f3049b64b55a342234 (diff)
downloadvexpress-lsk-4313902ebe33155209472215c62d2f29d117be29.tar.gz
[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>
Diffstat (limited to 'drivers/media/pci/ivtv')
-rw-r--r--drivers/media/pci/ivtv/ivtv-driver.h1
-rw-r--r--drivers/media/pci/ivtv/ivtv-irq.c50
2 files changed, 51 insertions, 0 deletions
diff --git a/drivers/media/pci/ivtv/ivtv-driver.h b/drivers/media/pci/ivtv/ivtv-driver.h
index 1918e732679..bc309f42c8e 100644
--- a/drivers/media/pci/ivtv/ivtv-driver.h
+++ b/drivers/media/pci/ivtv/ivtv-driver.h
@@ -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 */
diff --git a/drivers/media/pci/ivtv/ivtv-irq.c b/drivers/media/pci/ivtv/ivtv-irq.c
index 1b3b9578bf4..19a7c9b990a 100644
--- a/drivers/media/pci/ivtv/ivtv-irq.c
+++ b/drivers/media/pci/ivtv/ivtv-irq.c
@@ -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);
}