zbar_image_t *zbar_video_next_image (zbar_video_t *vdo)
{
unsigned frame;
zbar_image_t *img;
if(video_lock(vdo))
return(NULL);
if(!vdo->active) {
video_unlock(vdo);
return(NULL);
}
frame = vdo->frame++;
img = vdo->dq(vdo);
if(img) {
img->seq = frame;
if(vdo->num_images < 2) {
/* return a *copy* of the video image and immediately recycle
* the driver's buffer to avoid deadlocking the resources
*/
zbar_image_t *tmp = img;
video_lock(vdo);
img = vdo->shadow_image;
vdo->shadow_image = (img) ? img->next : NULL;
video_unlock(vdo);
if(!img) {
img = zbar_image_create();
assert(img);
img->refcnt = 0;
img->src = vdo;
/* recycle the shadow images */
img->format = vdo->format;
zbar_image_set_size(img, vdo->width, vdo->height);
img->datalen = vdo->datalen;
img->data = malloc(vdo->datalen);
}
img->cleanup = _zbar_video_recycle_shadow;
img->seq = frame;
memcpy((void*)img->data, tmp->data, img->datalen);
_zbar_video_recycle_image(tmp);
}
else
img->cleanup = _zbar_video_recycle_image;
_zbar_image_refcnt(img, 1);
}
return(img);
}
int zbar_video_open (zbar_video_t *vdo,
const char *dev)
{
char *ldev = NULL;
int rc;
zbar_video_enable(vdo, 0);
video_lock(vdo);
if(vdo->intf != VIDEO_INVALID) {
if(vdo->cleanup) {
vdo->cleanup(vdo);
vdo->cleanup = NULL;
}
zprintf(1, "closed camera (fd=%d)\n", vdo->fd);
vdo->intf = VIDEO_INVALID;
}
video_unlock(vdo);
if(!dev)
return(0);
if((unsigned char)dev[0] < 0x10) {
/* default linux device, overloaded for other platforms */
int id = dev[0];
dev = ldev = strdup("/dev/video0");
ldev[10] = '0' + id;
}
rc = _zbar_video_open(vdo, dev);
if(ldev)
free(ldev);
return(rc);
}
static void _zbar_video_recycle_shadow (zbar_image_t *img)
{
zbar_video_t *vdo = img->src;
assert(vdo);
assert(img->srcidx == -1);
video_lock(vdo);
img->next = vdo->shadow_image;
vdo->shadow_image = img;
video_unlock(vdo);
}
int zbar_video_enable (zbar_video_t *vdo,
int enable)
{
if(vdo->active == enable)
return(0);
if(enable) {
if(vdo->intf == VIDEO_INVALID)
return(err_capture(vdo, SEV_ERROR, ZBAR_ERR_INVALID, __func__,
"video device not opened"));
if(!vdo->initialized &&
zbar_negotiate_format(vdo, NULL))
return(-1);
}
if(video_lock(vdo))
return(-1);
vdo->active = enable;
if(enable) {
/* enqueue all buffers */
int i;
for(i = 0; i < vdo->num_images; i++)
if(vdo->nq(vdo, vdo->images[i]) ||
((i + 1 < vdo->num_images) && video_lock(vdo)))
return(-1);
return(vdo->start(vdo));
}
else {
int i;
for(i = 0; i < vdo->num_images; i++)
vdo->images[i]->next = NULL;
vdo->nq_image = vdo->dq_image = NULL;
if(video_unlock(vdo))
return(-1);
return(vdo->stop(vdo));
}
}
static void _zbar_video_recycle_image (zbar_image_t *img)
{
zbar_video_t *vdo = img->src;
assert(vdo);
assert(img->srcidx >= 0);
video_lock(vdo);
if(vdo->images[img->srcidx] != img)
vdo->images[img->srcidx] = img;
if(vdo->active)
vdo->nq(vdo, img);
else
video_unlock(vdo);
}
static void scene_video_tick(void *data, float seconds)
{
struct obs_scene *scene = data;
struct obs_scene_item *item;
video_lock(scene);
item = scene->first_item;
while (item) {
if (item->item_render)
gs_texrender_reset(item->item_render);
item = item->next;
}
video_unlock(scene);
UNUSED_PARAMETER(seconds);
}
static void scene_video_render(void *data, gs_effect_t *effect)
{
DARRAY(struct obs_scene_item*) remove_items;
struct obs_scene *scene = data;
struct obs_scene_item *item;
da_init(remove_items);
video_lock(scene);
item = scene->first_item;
gs_blend_state_push();
gs_reset_blend_state();
while (item) {
if (obs_source_removed(item->source)) {
struct obs_scene_item *del_item = item;
item = item->next;
remove_without_release(del_item);
da_push_back(remove_items, &del_item);
continue;
}
if (source_size_changed(item))
update_item_transform(item);
if (item->user_visible) {
gs_matrix_push();
gs_matrix_mul(&item->draw_transform);
obs_source_video_render(item->source);
gs_matrix_pop();
}
item = item->next;
}
gs_blend_state_pop();
video_unlock(scene);
for (size_t i = 0; i < remove_items.num; i++)
obs_sceneitem_release(remove_items.array[i]);
da_free(remove_items);
UNUSED_PARAMETER(effect);
}
// -----------------------------------------------------------------------------
static void *tracking_thread(void *arg)
{
globals.tracking = 1;
tracking_args_t *data = (tracking_args_t *)arg;
track_coords_t coords;
video_data_t vid_data;
unsigned long buff_sz = 0;
uint8_t *jpg_buf = NULL, *rgb_buff = NULL;
int delta, frames_computed = 0, tracking_fps = 0, streaming_fps = 0;
struct timespec t0, t1, tc;
clock_gettime(CLOCK_REALTIME, &t0);
while (data->running) {
// lock the colordetect parameters and determine our tracking fps
pthread_mutex_lock(&data->lock);
streaming_fps = video_get_fps();
tracking_fps = MIN(data->trackingRate, streaming_fps);
pthread_mutex_unlock(&data->lock);
// if tracking is disable - sleep and check for a change every second
if (tracking_fps <= 0 || globals.tracking == 0) {
sleep(1);
continue;
}
// make synchronous frame read -- sleep for a second and retry on fail
if (!video_lock(&vid_data, ACCESS_SYNC)) {
syslog(LOG_ERR, "colordetect failed to lock frame\n");
sleep(1);
continue;
}
clock_gettime(CLOCK_REALTIME, &tc);
delta = timespec_delta(&t0, &tc);
if (((frames_computed * 1000000) / delta) >= tracking_fps) {
video_unlock();
continue;
}
// copy the jpeg to our buffer now that we're safely locked
if (buff_sz < vid_data.length) {
free(jpg_buf);
buff_sz = vid_data.length;
jpg_buf = (uint8_t *)malloc(buff_sz);
}
memcpy(jpg_buf, vid_data.data, vid_data.length);
video_unlock();
if (0 != jpeg_rd_mem(jpg_buf, buff_sz, &rgb_buff,
&coords.width, &coords.height)) {
colordetect_hsl_fp32(rgb_buff, &data->color, &coords);
frames_computed++;
}
pthread_mutex_lock(&data->coord_lock);
// copy over the updated coordinates to the global struct
globals.coords = coords;
// inform any listeners that new data is available
pthread_cond_broadcast(&globals.coord_cond);
pthread_mutex_unlock(&data->coord_lock);
if (frames_computed >= streaming_fps) {
// every time we hit the streaming fps, dump out the tracking rate
clock_gettime(CLOCK_REALTIME, &t1);
real_t delta = timespec_delta(&t0, &t1) / (real_t)1000000;
syslog(LOG_INFO, "tracking fps: %f\n", streaming_fps / delta);
frames_computed = 0;
t0 = t1;
}
}
pthread_exit(NULL);
}
static inline void full_lock(struct obs_scene *scene)
{
video_lock(scene);
audio_lock(scene);
}