static int vfw_nq (zbar_video_t *vdo,
zbar_image_t *img)
{
img->data = NULL;
img->datalen = 0;
return(video_nq_image(vdo, img));
}
static int v4l2_nq (zbar_video_t *vdo,
zbar_image_t *img)
{
if(vdo->iomode == VIDEO_READWRITE)
return(video_nq_image(vdo, img));
if(video_unlock(vdo))
return(-1);
struct v4l2_buffer vbuf;
memset(&vbuf, 0, sizeof(vbuf));
vbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if(vdo->iomode == VIDEO_MMAP) {
vbuf.memory = V4L2_MEMORY_MMAP;
vbuf.index = img->srcidx;
}
else {
vbuf.memory = V4L2_MEMORY_USERPTR;
vbuf.m.userptr = (unsigned long)img->data;
vbuf.length = img->datalen;
vbuf.index = img->srcidx; /* FIXME workaround broken drivers */
}
if(ioctl(vdo->fd, VIDIOC_QBUF, &vbuf) < 0)
return(err_capture(vdo, SEV_ERROR, ZBAR_ERR_SYSTEM, __func__,
"queuing video buffer (VIDIOC_QBUF)"));
return(0);
}
static int v4l1_nq (zbar_video_t *vdo,
zbar_image_t *img)
{
if(video_nq_image(vdo, img))
return(-1);
if(vdo->iomode != VIDEO_MMAP)
return(0);
struct video_mmap vmap;
vmap.frame = img->srcidx;
vmap.width = vdo->width;
vmap.height = vdo->height;
vmap.format = vdo->palette;
if(ioctl(vdo->fd, VIDIOCMCAPTURE, &vmap) < 0)
return(err_capture(vdo, SEV_ERROR, ZBAR_ERR_SYSTEM, __func__,
"initiating video capture (VIDIOCMCAPTURE)"));
return(0);
}