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[media] usbtv: discard redundant video fields

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There are many dropped fields with some sources, leading to many
redundant fields without counterparts. When this redundant field
is odd, a new frame is pushed containing this odd field interleaved
with whatever was left in the buffer, causing video artifacts.

Do not push a new frame after processing every odd field, but do it
only after those which come after an even field.

Signed-off-by: Nikola Forró <nikola.forro@gmail.com>
Acked-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Nikola Forró 2015-12-20 09:57:17 -02:00 committed by Mauro Carvalho Chehab
parent 9f1830206d
commit 80fa4f07fd
2 changed files with 19 additions and 13 deletions
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31
drivers/media/usb/usbtv/usbtv-video.c
View File

@ -312,20 +312,24 @@ static void usbtv_image_chunk(struct usbtv *usbtv, __be32 *chunk)
usbtv_chunk_to_vbuf(frame, &chunk[1], chunk_no, odd);
usbtv->chunks_done++;
/* Last chunk in a frame, signalling an end */
if (odd && chunk_no == usbtv->n_chunks-1) {
int size = vb2_plane_size(&buf->vb.vb2_buf, 0);
enum vb2_buffer_state state = usbtv->chunks_done ==
usbtv->n_chunks ?
VB2_BUF_STATE_DONE :
VB2_BUF_STATE_ERROR;
/* Last chunk in a field */
if (chunk_no == usbtv->n_chunks-1) {
/* Last chunk in a frame, signalling an end */
if (odd && !usbtv->last_odd) {
int size = vb2_plane_size(&buf->vb.vb2_buf, 0);
enum vb2_buffer_state state = usbtv->chunks_done ==
usbtv->n_chunks ?
VB2_BUF_STATE_DONE :
VB2_BUF_STATE_ERROR;
buf->vb.field = V4L2_FIELD_INTERLACED;
buf->vb.sequence = usbtv->sequence++;
buf->vb.vb2_buf.timestamp = ktime_get_ns();
vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
vb2_buffer_done(&buf->vb.vb2_buf, state);
list_del(&buf->list);
buf->vb.field = V4L2_FIELD_INTERLACED;
buf->vb.sequence = usbtv->sequence++;
buf->vb.vb2_buf.timestamp = ktime_get_ns();
vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
vb2_buffer_done(&buf->vb.vb2_buf, state);
list_del(&buf->list);
}
usbtv->last_odd = odd;
}
spin_unlock_irqrestore(&usbtv->buflock, flags);
@ -639,6 +643,7 @@ static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count)
if (usbtv->udev == NULL)
return -ENODEV;
usbtv->last_odd = 1;
usbtv->sequence = 0;
return usbtv_start(usbtv);
}

1
drivers/media/usb/usbtv/usbtv.h
View File

@ -95,6 +95,7 @@ struct usbtv {
int width, height;
int n_chunks;
int iso_size;
int last_odd;
unsigned int sequence;
struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS];