PlayBook ndk - camera_take_photo his return with error 17 - file exists
Fellow developer,
I use C++ NDK for blackberry playbook (tests with the playbook material) and a problem came in my way. I can take pictures with the camera_take_photo function. I'm trying to capture faster so I'm setting wait to false. In this case camera_take_photo will not block running my application.
The problem is that if the last call to image_callback of camera_take_photofunction is not yet complete and that I call camera_take_photo once again I'll error as a result. Error code is: 17 who is not related to camera_error_t. I had checked in errno.h and is:
My question is that this kind of file? I know camera_take_photo is not save any file (only when I implement registration photo).
Error 17 in errno.h:
#define EEXIST 17 /* File exists */
My implementation:
void CameraModule::takePhoto() { camera_error_t result1 = camera_take_photo(this->m_CameraHandle, NULL, NULL, NULL, CameraModule::photoImageCallback, NULL, false);} void CameraModule::photoImageCallback(camera_handle_t cameraHandle1, camera_buffer_t * cameraBuffer1, void * params) { // JPeG is ready and I can save it // But this is an empty function for testing sleep (3000); // do nothing for 3 seconds}
Call us at:
// Test 1:takePhoto(); // OK takePhoto(); // Error 17 from camera_take_photo, but I'm not writing any file // Test 2: takePhoto(); // OK sleep(5000); // Wait some seconds takePhoto(); // OK
Flowchart to represent the error:
Reference to the use of camera_take_photo :
camera_error_t camera_take_photo(camera_handle_t handle, void (*shutter_callback)(camera_handle_t, void*), void (*raw_callback)(camera_handle_t, camera_buffer_t*, void*), void (*postview_callback)(camera_handle_t, camera_buffer_t*, void*), void (*image_callback)(camera_handle_t, camera_buffer_t*, void*), void *arg, bool wait);
Your help is appreciated in advance.
Thank you.
The solution, I would say something like the following... excuse the pseudocode.
void* burst_thread() { while(!stop_bursting) { camera_take_photo(....., still_callback, ..., true); } stop_saving = true; pthread_cond_signal(&queueCond); // wake queue thread so it can exit } void still_callback(...) { to_save = new(...); memcpy(to_save, buffer, size); pthread_mutex_lock(&queueMutex); add_to_save_queue(to_save); pthread_cond_signal(&queueCond); // wake queue thread pthread_mutex_unlock(&queueMutex); } void* save_thread(...) { pthread_mutex_lock(&queueMutex); while(!stop_saving) { if (queue_is_empty()) { pthread_wait(&queueCond, &queueMutex); } if (!queue_is_empty()) { x = dequeue_buffer(); pthread_mutex_unlock(&queueMutex); // unlock while busy save_buffer(x); delete x; pthread_mutex_lock(&queueMutex); } } pthread_mutex_unlock(&queueMutex); // cleanup queue while(!queue_is_empty()) { clean up dangling buffers? or save them to disk. whatever. just make sure not to leak memory. } } void start_bursting() { stop_bursting = stop_saving = false; pthread_create(save_thread); pthread_create(burst_thread); } void stop_bursting() { stop_bursting = true; pthread_join(burst_thread_tid); pthread_join(save_thread_tid); }
There is a little extra synchronization required in the processing thread: see if (is_queue_empty()). This is because the thread passes time saving files and cannot be blocked on condvar cheque when the signals of the other thread. If (check is_queue_empty()) is here to detect these missed signals.
When someone hits the "start by holding button images", you start the shooting wire and thread photo-economie. When a user releases the button, or click on a stop button, you report the nets to stop and wait for them to end.
Note that the termination of the thread of savings made by shooting wire. This allows to avoid prematurely stop the saving thread when the callback is always enqueueing a buffer.
See you soon,.
Sean
Tags: BlackBerry Developers
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