static zbar_image_t *v4l2_dq (zbar_video_t *vdo)
{
zbar_image_t *img;
int fd = vdo->fd;
if(vdo->iomode != VIDEO_READWRITE) {
video_iomode_t iomode = vdo->iomode;
if(video_unlock(vdo))
return(NULL);
struct v4l2_buffer vbuf;
memset(&vbuf, 0, sizeof(vbuf));
vbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if(iomode == VIDEO_MMAP)
vbuf.memory = V4L2_MEMORY_MMAP;
else
vbuf.memory = V4L2_MEMORY_USERPTR;
if(ioctl(fd, VIDIOC_DQBUF, &vbuf) < 0)
return(NULL);
if(iomode == VIDEO_MMAP) {
assert(vbuf.index >= 0);
assert(vbuf.index < vdo->num_images);
img = vdo->images[vbuf.index];
}
else {
/* reverse map pointer back to image (FIXME) */
assert(vbuf.m.userptr >= (unsigned long)vdo->buf);
assert(vbuf.m.userptr < (unsigned long)(vdo->buf + vdo->buflen));
int i = (vbuf.m.userptr - (unsigned long)vdo->buf) / vdo->datalen;
assert(i >= 0);
assert(i < vdo->num_images);
img = vdo->images[i];
assert(vbuf.m.userptr == (unsigned long)img->data);
}
}
else {
img = video_dq_image(vdo);
if(!img)
return(NULL);
/* FIXME should read entire image */
unsigned long datalen = read(fd, (void*)img->data, img->datalen);
if(datalen < 0)
return(NULL);
else if(datalen != img->datalen)
zprintf(0, "WARNING: read() size mismatch: 0x%lx != 0x%lx\n",
datalen, img->datalen);
}
return(img);
}
static zbar_image_t *v4l1_dq (zbar_video_t *vdo)
{
video_iomode_t iomode = vdo->iomode;
int fd = vdo->fd;
zbar_image_t *img = video_dq_image(vdo);
if(!img)
return(NULL);
if(iomode == VIDEO_MMAP) {
int frame = img->srcidx;
if(ioctl(fd, VIDIOCSYNC, &frame) < 0)
return(NULL);
}
else if(read(fd, (void*)img->data, img->datalen) != img->datalen)
return(NULL);
return(img);
}
static LRESULT CALLBACK vfw_stream_cb (HWND hwnd,
VIDEOHDR *hdr)
{
if(!hwnd || !hdr)
return(0);
zbar_video_t *vdo = (void*)capGetUserData(hwnd);
_zbar_mutex_lock(&vdo->qlock);
zbar_image_t *img = vdo->state->image;
if(!img) {
_zbar_mutex_lock(&vdo->qlock);
img = video_dq_image(vdo);
}
if(img) {
img->data = hdr->lpData;
img->datalen = hdr->dwBufferLength;
vdo->state->image = img;
SetEvent(vdo->state->captured);
}
_zbar_mutex_unlock(&vdo->qlock);
return(1);
}
