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POThe iPhone 3GS and kCVPixelFormatType_420YpCbCr8BiPlanarFullRange format?
 

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  1. POThe iPhone 3GS and kCVPixelFormatType_420YpCbCr8BiPlanarFullRange format?
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    <p>I'm developing an iOS application with latest SDK and testing it on an iPhone 3GS.</p> <p>I'm doing this on init method:</p> <pre><code>CFDictionaryRef formatDictionary = CVPixelFormatDescriptionCreateWithPixelFormatType(kCFAllocatorDefault, kCVPixelFormatType_420YpCbCr8BiPlanarFullRange); CFNumberRef val = (CFNumberRef) CFDictionaryGetValue(formatDictionary, kCVPixelFormatBitsPerBlock); if (val != nil) { CFNumberGetValue(val,kCFNumberSInt8Type, &amp;_bytesPerPixel); _bytesPerPixel /= 8; } else _bytesPerPixel = 4; </code></pre> <p>But val is always nil.</p> <p>And here:</p> <pre><code>- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); //Lock the image buffer// CVPixelBufferLockBaseAddress(imageBuffer,0); //Get information about the image// uint8_t *baseAddress = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer); size_t width = CVPixelBufferGetWidth(imageBuffer); size_t height = CVPixelBufferGetHeight(imageBuffer); //size_t stride = CVPixelBufferGetBytesPerRow(imageBuffer); //put buffer in open cv, no memory copied cv::Mat image = cv::Mat(height, width, CV_8UC4, baseAddress); // copy the image //cv::Mat copied_image = image.clone(); [_previewBufferLock lock]; memcpy(baseAddress, _lastFrame, _previewSurfaceHeight * _previewSurfaceWidth * _bytesPerPixel); [_previewBufferLock unlock]; //We unlock the image buffer// CVPixelBufferUnlockBaseAddress(imageBuffer,0); } </code></pre> <p>I have add a breakpoint on memcpy line and I these are my vars values:</p> <p><img src="https://i.stack.imgur.com/H5arO.png" alt="enter image description here"></p> <p>But I'm getting an EXEC_BAD_ACCESS here: <code>memcpy(baseAddress, _lastFrame, _previewSurfaceHeight * _previewSurfaceWidth * _bytesPerPixel);</code></p> <p><strong>Does the iPhone 3GS support kCVPixelFormatType_420YpCbCr8BiPlanarFullRange?</strong></p>
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