diff options
Diffstat (limited to 'drivers/media/video/ivtv/ivtv-fileops.c')
| -rw-r--r-- | drivers/media/video/ivtv/ivtv-fileops.c | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/drivers/media/video/ivtv/ivtv-fileops.c b/drivers/media/video/ivtv/ivtv-fileops.c index a200a8a95a2..58ad0d9c680 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; @@ -604,9 +605,16 @@ 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 +623,16 @@ 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); @@ -922,10 +940,15 @@ 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 = + itv->params.width * itv->params.height * 3 / 2; + itv->yuv_info.stream_size = 0; + } return 0; } |