diff options
Diffstat (limited to 'drivers/media/pci/bt8xx')
| -rw-r--r-- | drivers/media/pci/bt8xx/bttv-driver.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/media/pci/bt8xx/bttv-driver.c b/drivers/media/pci/bt8xx/bttv-driver.c index 8e8c9dada67a..49a3dd70ec0f 100644 --- a/drivers/media/pci/bt8xx/bttv-driver.c +++ b/drivers/media/pci/bt8xx/bttv-driver.c @@ -2772,6 +2772,27 @@ bttv_irq_wakeup_vbi(struct bttv *btv, struct bttv_buffer *wakeup, return; wakeup->vbuf.vb2_buf.timestamp = ktime_get_ns(); wakeup->vbuf.sequence = btv->field_count >> 1; + + /* + * Ugly hack for backwards compatibility. + * Some applications expect that the last 4 bytes of + * the VBI data contains the sequence number. + * + * This makes it possible to associate the VBI data + * with the video frame if you use read() to get the + * VBI data. + */ + if (vb2_fileio_is_active(wakeup->vbuf.vb2_buf.vb2_queue)) { + u32 *vaddr = vb2_plane_vaddr(&wakeup->vbuf.vb2_buf, 0); + unsigned long size = + vb2_get_plane_payload(&wakeup->vbuf.vb2_buf, 0) / 4; + + if (vaddr && size) { + vaddr += size - 1; + *vaddr = wakeup->vbuf.sequence; + } + } + vb2_buffer_done(&wakeup->vbuf.vb2_buf, state); if (btv->field_count == 0) btor(BT848_INT_VSYNC, BT848_INT_MASK); |