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[media] usbtv: Throw corrupted frames away

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Ignore out of order data and mark incomplete buffers as errored.
This gets rid of annoying flicker due to occassional garbage from hardware.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-media@vger.kernel.org
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Lubomir Rintel 2013-07-02 07:56:39 -03:00 committed by Mauro Carvalho Chehab
parent a34cacab15
commit f52dc448a3
1 changed files with 13 additions and 2 deletions
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15
drivers/media/usb/usbtv/usbtv.c
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@ -89,6 +89,7 @@ struct usbtv {
/* Number of currently processed frame, useful find
* out when a new one begins. */
u32 frame_id;
int chunks_done;
int iso_size;
unsigned int sequence;
@ -242,8 +243,13 @@ static void usbtv_image_chunk(struct usbtv *usbtv, u32 *chunk)
return;
/* Beginning of a frame. */
if (chunk_no == 0)
if (chunk_no == 0) {
usbtv->frame_id = frame_id;
usbtv->chunks_done = 0;
}
if (usbtv->frame_id != frame_id)
return;
spin_lock_irqsave(&usbtv->buflock, flags);
if (list_empty(&usbtv->bufs)) {
@ -258,16 +264,21 @@ static void usbtv_image_chunk(struct usbtv *usbtv, u32 *chunk)
/* Copy the chunk data. */
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_CHUNKS-1) {
int size = vb2_plane_size(&buf->vb, 0);
enum vb2_buffer_state state = usbtv->chunks_done ==
USBTV_CHUNKS ?
VB2_BUF_STATE_DONE :
VB2_BUF_STATE_ERROR;
buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED;
buf->vb.v4l2_buf.sequence = usbtv->sequence++;
v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
vb2_set_plane_payload(&buf->vb, 0, size);
vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
vb2_buffer_done(&buf->vb, state);
list_del(&buf->list);
}