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POUIImageWriteToSavedPhotosAlbum causes EXC_BAD_ACCESS
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  1. POUIImageWriteToSavedPhotosAlbum causes EXC_BAD_ACCESS
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    copied!<p>I develop a CGImage and it works fine when the program displays it on the screen using this:</p> <pre><code>[output_view.layer performSelectorOnMainThread:@selector(setContents:) withObject: (id) image waitUntilDone:YES]; </code></pre> <p>Now, doing this crashes the application:</p> <pre><code>UIImageWriteToSavedPhotosAlbum([UIImage imageWithCGImage: image)],nil,nil,nil); </code></pre> <p>I don't understand it at all. Here's the stack during the crash:</p> <pre><code>#0 0x33b5db6e in memmove (Line 65) #1 0x341ddee2 in CGAccessSessionGetBytes #2 0x31ab4488 in alphaProviderGetBytes #3 0x341ddf52 in CGAccessSessionGetBytes #4 0x31abbc80 in writeOne #5 0x31abbdae in _CGImagePluginWriteJPEG #6 0x31ab2ddc in CGImageDestinationFinalize #7 0x3037eda2 in imageDataFromImageWithFormatAndProperties #8 0x3037effc in imageDataFromImageRef #9 0x3038ea3c in __-[PLAssetsSaver _saveImage:imageData:properties:completionBlock:]_block_invoke_1 #10 0x33c32680 in _dispatch_call_block_and_release #11 0x33c32ba0 in _dispatch_worker_thread2 #12 0x33bd7250 in _pthread_wqthread </code></pre> <p>Here is the method with the problem:</p> <pre><code>-(void)captureOutput: (AVCaptureOutput *) captureOutput didOutputSampleBuffer: (CMSampleBufferRef) sampleBuffer fromConnection: (AVCaptureConnection *) conenction{ NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; // Get a CMSampleBuffer's Core Video image buffer for the media data CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); // Lock the base address of the pixel buffer CVPixelBufferLockBaseAddress(imageBuffer, 0); // Get the number of bytes per row for the pixel buffer UInt8 * image_data = CVPixelBufferGetBaseAddress(imageBuffer); // Get the number of bytes per row for the pixel buffer size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); // Get the pixel buffer width and height size_t width = CVPixelBufferGetWidth(imageBuffer); size_t height = CVPixelBufferGetHeight(imageBuffer); //Removed part here which modifies the CVPixelBuffer pixels with a particular algorithm. [bottom_view setNeedsDisplay]; [bottom_view performSelectorOnMainThread:@selector(setBackgroundColor:) withObject: [UIColor colorWithRed:0 green:av/255.0 blue:0 alpha:1] waitUntilDone: YES]; // Create a device-dependent RGB color space CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); // Create a Quartz image from the pixel data CGDataProviderDirectCallbacks providerCallbacks = { 0, GetBytePointer, ReleaseBytePointer, GetBytesAtPosition, 0 }; CGDataProviderRef d_provider = CGDataProviderCreateDirect(image_data,pixels*4,&amp;providerCallbacks); CGImageRef image = CGImageCreate (width,height,8,32,bytesPerRow,colorSpace,kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst,d_provider,NULL,true,kCGRenderingIntentDefault); //Draw image if (needs_photo) { UIImageWriteToSavedPhotosAlbum([UIImage imageWithCGImage: image],nil,nil,nil); needs_photo = NO; } if (recording) { [writer_input appendSampleBuffer:sampleBuffer]; } [output_view.layer performSelectorOnMainThread:@selector(setContents:) withObject: (id) image waitUntilDone:YES]; // Unlock the pixel buffer CVPixelBufferUnlockBaseAddress(imageBuffer,0); // Free up the context and color space CGColorSpaceRelease(colorSpace); CGImageRelease(image); CGDataProviderRelease(d_provider); [pool drain]; } </code></pre> <p>Thank you for any help with this problem.</p>
 

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