static void v4l2_prepare(struct frame *f)
{
if (pixconv) {
struct v4l2_buffer buf;
dqbuf(&buf);
cur_buf = &vid_buffers[buf.index];
pixconv->convert(cur_buf->data, f->vdata, NULL, NULL);
} else if (f->x != crop.c.left || f->y != crop.c.top) {
crop.c.left = f->x;
crop.c.top = f->y;
ioctl(vid_fd, VIDIOC_S_CROP, &crop);
}
}
static void v4l2_show(struct frame *f)
{
if (pixconv) {
pixconv->finish();
ioctl(vid_fd, VIDIOC_QBUF, &cur_buf->buf);
cur_buf = NULL;
ofbp_put_frame(f);
} else {
struct v4l2_buffer buf;
ioctl(vid_fd, VIDIOC_QBUF, &vid_buffers[f->frame_num].buf);
dqbuf(&buf);
ofbp_put_frame(&vid_frames[buf.index]);
}
}
int V4L2VideoNode::grabFrame(struct v4l2_buffer_info *buf)
{
LOG2("@%s", __FUNCTION__);
int ret(0);
if (mState != DEVICE_STARTED) {
LOGE("%s invalid device state %d",__FUNCTION__, mState);
return -1;
}
if (buf == NULL) {
LOGE("%s: invalid parameter buf is NULL",__FUNCTION__);
return -1;
}
ret = dqbuf(buf);
if (ret < 0)
return ret;
// inc frame counter but do no wrap to negative numbers
mFrameCounter++;
mFrameCounter &= INT_MAX;
// atomisp_frame_status is a proprietary extension to v4l2_buffer flags
// that driver places into reserved keyword
// translate error flag into corrupt frame
if (buf->vbuffer.flags & V4L2_BUF_FLAG_ERROR)
buf->vbuffer.reserved = (unsigned int) ATOMISP_FRAME_STATUS_CORRUPTED;
// translate initial skips into corrupt frame
if (mInitialSkips > 0) {
buf->vbuffer.reserved = (unsigned int) ATOMISP_FRAME_STATUS_CORRUPTED;
mInitialSkips--;
}
LOG2("@%s, index:%d, addr:%p", __FUNCTION__, buf->vbuffer.index, (void *)buf->vbuffer.m.userptr);
return buf->vbuffer.index;
}
