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path: root/drivers/media/video/ivtv/ivtv-fileops.c
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Diffstat (limited to 'drivers/media/video/ivtv/ivtv-fileops.c')
-rw-r--r--drivers/media/video/ivtv/ivtv-fileops.c52
1 files changed, 48 insertions, 4 deletions
diff --git a/drivers/media/video/ivtv/ivtv-fileops.c b/drivers/media/video/ivtv/ivtv-fileops.c
index a200a8a95a2..6fb96f19a86 100644
--- a/drivers/media/video/ivtv/ivtv-fileops.c
+++ b/drivers/media/video/ivtv/ivtv-fileops.c
@@ -542,6 +542,7 @@ ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t c
struct ivtv_open_id *id = filp->private_data;
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
+ struct yuv_playback_info *yi = &itv->yuv_info;
struct ivtv_buffer *buf;
struct ivtv_queue q;
int bytes_written = 0;
@@ -580,6 +581,24 @@ ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t c
set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
retry:
+ /* If possible, just DMA the entire frame - Check the data transfer size
+ since we may get here before the stream has been fully set-up */
+ if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
+ while (count >= itv->dma_data_req_size) {
+ if (!ivtv_yuv_udma_stream_frame (itv, (void *)user_buf)) {
+ bytes_written += itv->dma_data_req_size;
+ user_buf += itv->dma_data_req_size;
+ count -= itv->dma_data_req_size;
+ } else {
+ break;
+ }
+ }
+ if (count == 0) {
+ IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
+ return bytes_written;
+ }
+ }
+
for (;;) {
/* Gather buffers */
while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
@@ -604,9 +623,16 @@ retry:
/* copy user data into buffers */
while ((buf = ivtv_dequeue(s, &q))) {
- /* Make sure we really got all the user data */
- rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
+ /* yuv is a pain. Don't copy more data than needed for a single
+ frame, otherwise we lose sync with the incoming stream */
+ if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
+ yi->stream_size + count > itv->dma_data_req_size)
+ rc = ivtv_buf_copy_from_user(s, buf, user_buf,
+ itv->dma_data_req_size - yi->stream_size);
+ else
+ rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
+ /* Make sure we really got all the user data */
if (rc < 0) {
ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
return rc;
@@ -615,6 +641,16 @@ retry:
count -= rc;
bytes_written += rc;
+ if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
+ yi->stream_size += rc;
+ /* If we have a complete yuv frame, break loop now */
+ if (yi->stream_size == itv->dma_data_req_size) {
+ ivtv_enqueue(s, buf, &s->q_full);
+ yi->stream_size = 0;
+ break;
+ }
+ }
+
if (buf->bytesused != s->buf_size) {
/* incomplete, leave in q_io for next time */
ivtv_enqueue(s, buf, &s->q_io);
@@ -642,6 +678,9 @@ retry:
if (s->q_full.length >= itv->dma_data_req_size) {
int got_sig;
+ if (mode == OUT_YUV)
+ ivtv_yuv_setup_stream_frame(itv);
+
prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
while (!(got_sig = signal_pending(current)) &&
test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
@@ -922,10 +961,15 @@ static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
}
/* YUV or MPG Decoding Mode? */
- if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
+ if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
- else if (s->type == IVTV_DEC_STREAM_TYPE_YUV)
+ } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
+ /* For yuv, we need to know the dma size before we start */
+ itv->dma_data_req_size =
+ 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
+ itv->yuv_info.stream_size = 0;
+ }
return 0;
}