Raw image data from camera like “645 PRO”

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Wow, that blog post was something special. A whole lot of words to just state that they get the sample buffer bytes that Apple hands you back from a still image. There’s nothing particularly innovative about their approach, and I know a number of camera applications that do this.

You can get at the raw bytes returned from a photo taken with a AVCaptureStillImageOutput using code like the following:

[photoOutput captureStillImageAsynchronouslyFromConnection:[[photoOutput connections] objectAtIndex:0] completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
    CVImageBufferRef cameraFrame = CMSampleBufferGetImageBuffer(imageSampleBuffer);
    CVPixelBufferLockBaseAddress(cameraFrame, 0);
    GLubyte *rawImageBytes = CVPixelBufferGetBaseAddress(cameraFrame);
    size_t bytesPerRow = CVPixelBufferGetBytesPerRow(cameraFrame);
    NSData *dataForRawBytes = [NSData dataWithBytes:rawImageBytes length:bytesPerRow * CVPixelBufferGetHeight(cameraFrame)];
    // Do whatever with your bytes

    CVPixelBufferUnlockBaseAddress(cameraFrame, 0);
}];

This will give you an NSData instance containing the uncompressed BGRA bytes returned from the camera. You can save these to disk or do whatever you want with them. If you really need to process the bytes themselves, I’d avoid the overhead of the NSData creation and just work with the byte array from the pixel buffer.

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