vidcap_avfoundation_state Class Reference

Inheritance diagram for vidcap_avfoundation_state:

Collaboration diagram for vidcap_avfoundation_state:

Instance Methods
(void)	- captureOutput:didOutputSampleBuffer:fromConnection:
(struct video_frame *)	- grab

Protected Attributes
AVCaptureDevice *	m_device
double	m_fps_req
condition_variable	m_frame_ready
int	m_frames
mutex	m_lock
queue< struct video_frame * >	m_queue
AVCaptureSession *	m_session
chrono::steady_clock::time_point	m_t0

Detailed Description

Definition at line 106 of file avfoundation.mm.

Method Documentation

captureOutput:didOutputSampleBuffer:fromConnection:

- (void) captureOutput:		(AVCaptureOutput *)	captureOutput
didOutputSampleBuffer:		(CMSampleBufferRef)	sampleBuffer
fromConnection:		(AVCaptureConnection *)	connection

Definition at line 115 of file avfoundation.mm.

                     :(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection
{
#pragma unused (captureOutput)
#pragma unused (connection)
        unique_lock<mutex> lock(m_lock);
        struct video_frame *frame = [self imageFromSampleBuffer: sampleBuffer];
        if (frame) {
                if (m_queue.size() < MAX_CAPTURE_QUEUE_SIZE) {
                        m_queue.push(frame);
                        lock.unlock();
                        m_frame_ready.notify_one();
                } else {
                        NSLog(@"Frame dropped!");
                        VIDEO_FRAME_DISPOSE(frame);
                }
        }
}

grab

- (struct video_frame *) grab

Definition at line 115 of file avfoundation.mm.

{
        unique_lock<mutex> lock(m_lock);
        m_frame_ready.wait_for(lock, milliseconds(100), [&]{return m_queue.size() != 0;});
        if (m_queue.size() == 0) {
                return NULL;
        } else {
                struct video_frame *ret;
                ret = m_queue.front();
                m_queue.pop();
 
                m_frames++;
 
                chrono::steady_clock::time_point now = chrono::steady_clock::now();
                double seconds = chrono::duration_cast<chrono::microseconds>(now - m_t0).count() / 1000000.0;
                if (seconds >= 5) {
                        cout << "[AVfoundation capture] " << m_frames << " frames in "
                                << seconds << " seconds = " <<  m_frames / seconds << " FPS\n";
                        m_t0 = now;
                        m_frames = 0;
                }
 
                return ret;
        }
}

Member Data Documentation

m_device

- (AVCaptureDevice*) m_device

protected

Definition at line 108 of file avfoundation.mm.

m_fps_req

- (double) m_fps_req

protected

Definition at line 114 of file avfoundation.mm.

m_frame_ready

- (condition_variable) m_frame_ready

protected

Definition at line 111 of file avfoundation.mm.

m_frames

- (int) m_frames

protected

Definition at line 115 of file avfoundation.mm.

m_lock

- (mutex) m_lock

protected

Definition at line 110 of file avfoundation.mm.

m_queue

- (queue<struct video_frame *>) m_queue

protected

Definition at line 112 of file avfoundation.mm.

m_session

- (AVCaptureSession*) m_session

protected

Definition at line 109 of file avfoundation.mm.

m_t0

- steady_clock:

protected

Definition at line 113 of file avfoundation.mm.

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The documentation for this class was generated from the following file:

• src/video_capture/avfoundation.mm