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);
}
int zbar_processor_set_active (zbar_processor_t *proc,
int active)
{
proc_enter(proc);
int rc;
if(!proc->video) {
rc = err_capture(proc, SEV_ERROR, ZBAR_ERR_INVALID, __func__,
"video input not initialized");
goto done;
}
_zbar_mutex_unlock(&proc->mutex);
zbar_image_scanner_enable_cache(proc->scanner, active);
rc = zbar_video_enable(proc->video, active);
if(!rc) {
_zbar_mutex_lock(&proc->mutex);
proc->streaming = active;
_zbar_mutex_unlock(&proc->mutex);
rc = _zbar_processor_enable(proc);
}
else
err_copy(proc, proc->video);
if(!proc->streaming && proc->window) {
if(zbar_window_draw(proc->window, NULL) && !rc)
rc = err_copy(proc, proc->window);
_zbar_processor_invalidate(proc);
}
_zbar_mutex_lock(&proc->mutex);
if(proc->video_thread.started)
_zbar_event_trigger(&proc->video_thread.notify);
done:
proc_leave(proc);
return(rc);
}
static void *zbar_gtk_processing_thread (void *arg)
{
ZBarGtk *self = ZBAR_GTK(arg);
if(!self->_private)
return(NULL);
ZBarGtkPrivate *zbar = ZBAR_GTK_PRIVATE(self->_private);
g_object_ref(zbar);
g_assert(zbar->queue);
g_async_queue_ref(zbar->queue);
zbar->scanner = zbar_image_scanner_create();
g_assert(zbar->scanner);
/* thread side enabled state */
gboolean video_enabled = FALSE;
GValue *msg = NULL;
while(TRUE) {
if(!msg)
msg = g_async_queue_pop(zbar->queue);
g_assert(G_IS_VALUE(msg));
GType type = G_VALUE_TYPE(msg);
if(type == G_TYPE_INT) {
/* video state change */
int state = g_value_get_int(msg);
if(state < 0) {
/* terminate processing thread */
g_value_unset(msg);
g_free(msg);
msg = NULL;
break;
}
g_assert(state >= 0 && state <= 1);
video_enabled = (state != 0);
}
else if(type == G_TYPE_STRING) {
/* open new video device */
const char *video_device = g_value_get_string(msg);
video_enabled = zbar_gtk_video_open(self, video_device);
}
else if(type == GDK_TYPE_PIXBUF) {
/* scan provided image and broadcast results */
zbar_image_t *image = zbar_image_create();
GdkPixbuf *pixbuf = GDK_PIXBUF(g_value_dup_object(msg));
if(zbar_gtk_image_from_pixbuf(image, pixbuf))
zbar_gtk_process_image(self, image);
else
g_object_unref(pixbuf);
zbar_image_destroy(image);
}
else {
gchar *dbg = g_strdup_value_contents(msg);
g_warning("unknown message type (%x) passed to thread: %s\n",
(unsigned)type, dbg);
g_free(dbg);
}
g_value_unset(msg);
g_free(msg);
msg = NULL;
if(video_enabled) {
/* release reference to any previous pixbuf */
zbar_window_draw(zbar->window, NULL);
if(zbar_video_enable(zbar->video, 1)) {
zbar_video_error_spew(zbar->video, 0);
video_enabled = FALSE;
continue;
}
zbar_image_scanner_enable_cache(zbar->scanner, 1);
while(video_enabled &&
!(msg = g_async_queue_try_pop(zbar->queue))) {
zbar_image_t *image = zbar_video_next_image(zbar->video);
if(zbar_gtk_process_image(self, image) < 0)
video_enabled = FALSE;
if(image)
zbar_image_destroy(image);
}
zbar_image_scanner_enable_cache(zbar->scanner, 0);
if(zbar_video_enable(zbar->video, 0)) {
zbar_video_error_spew(zbar->video, 0);
video_enabled = FALSE;
}
/* release video image and revert to logo */
if(zbar->window) {
zbar_window_draw(zbar->window, NULL);
gtk_widget_queue_draw(GTK_WIDGET(self));
}
if(!video_enabled)
/* must have been an error while streaming */
zbar_gtk_video_open(self, NULL);
}
}
if(zbar->window)
zbar_window_draw(zbar->window, NULL);
g_object_unref(zbar);
return(NULL);
}
