sample code for using callbacks

[mohaps]

Awesome library! :) using it for a "toy" project to build my son a present for xmas.

I'm trying to use sinks=['callbacks'] in the constructor, but when I do camera.snap_picture() I get an error:

File "cam_capture.py", line 103, in capture_from_camera
    f = self.camera.snap_picture(blocking=blocking)
  File "/src/avf.pyx", line 244, in pyavfcam.AVFCam.snap_picture (src/avf.cpp:3125)
ValueError: image video sink not initialized

My camera class is constructed as

class Camera (pyavfcam.AVFCam): 
    def __init__(self, sinks = ['callback'], *args, **kwargs):
        pyavfcam.AVFCam.__init__(self, sinks, *args, **kwargs)
    def file_output_done(self, errorOccured):
        logging.info('file output done : %s' % errorOccured)
    def video_output(self, frame):
        logging.info('video output done : %s' % frame)
    def image_output(self, frame):
        logging.info('image output done : %s' % frame)

Would really appreciate a sample for using callbacks.

[dashesy]

Sorry I did not finish the callback, but will look at it soon.
If you want to snap pictures you do not need the callback, you can use image sink like this and many times as you want to take pictures. Callback is for live video/webcam processing with no dropped frames, and I need to buffer them to make this possible. BTW, with image sink if you do not provide a name it will not save a file and just returns the frame.

[landersson]

I also just tried to use pyavfcam, which looks nice and simple, for real-time webcam video processing using the semi-documented callback functionality before realising that it's not working. I'd be interested in trying it if you en up finishing it.