static void *read_thread(void *arg)
{
struct vidsrc_st *st = arg;
while (st->run) {
ssize_t n;
n = read(st->fd, st->mb->buf, st->mb->size);
if ((ssize_t)st->mb->size != n) {
DEBUG_WARNING("video read: %d -> %d bytes\n",
st->mb->size, n);
continue;
}
call_frame_handler(st, st->mb->buf);
}
return NULL;
}
static int read_frame(struct vidsrc_st *st)
{
struct v4l2_buffer buf;
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
if (-1 == xioctl (st->fd, VIDIOC_DQBUF, &buf)) {
switch (errno) {
case EAGAIN:
return 0;
case EIO:
/* Could ignore EIO, see spec. */
/* fall through */
default:
warning("v4l2: VIDIOC_DQBUF: %m\n", errno);
return errno;
}
}
if (buf.index >= st->n_buffers) {
warning("v4l2: index >= n_buffers\n");
}
call_frame_handler(st, st->buffers[buf.index].start);
if (-1 == xioctl (st->fd, VIDIOC_QBUF, &buf)) {
warning("v4l2: VIDIOC_QBUF\n");
return errno;
}
return 0;
}