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POHow do I convert a CGImage to CMSampleBufferRef?
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3751664
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AcceptedAnswerId
3758152
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1
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0
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CreationDate
2010-09-20T12:57:43.323
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11
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2017-06-20T09:59:06.180
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2010-09-21T06:58:27.280
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17279
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17279
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0
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1
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14
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7095
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text
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<p>I’d like to convert a <code>CGImage</code> to <code>CMSampleBufferRef</code> and append it to a <code>AVAssetWriterInput</code> using the <code>appendSampleBuffer:</code> method. I’ve managed to get the <code>CMSampleBufferRef</code> using the following code, but the <code>appendSampleBuffer:</code> simply returns <code>NO</code> when I supply the resulting <code>CMSampleBufferRef</code>. What am I doing wrong?</p> <pre><code>- (void) appendCGImage: (CGImageRef) frame { const int width = CGImageGetWidth(frame); const int height = CGImageGetHeight(frame); // Create a dummy pixel buffer to try the encoding // on something simple. CVPixelBufferRef pixelBuffer = NULL; CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, width, height, kCVPixelFormatType_32BGRA, NULL, &pixelBuffer); NSParameterAssert(status == kCVReturnSuccess && pixelBuffer != NULL); // Sample timing info. CMTime frameTime = CMTimeMake(1, 30); CMTime currentTime = CMTimeAdd(lastSampleTime, frameTime); CMSampleTimingInfo timing = {frameTime, currentTime, kCMTimeInvalid}; OSStatus result = 0; // Sample format. CMVideoFormatDescriptionRef videoInfo = NULL; result = CMVideoFormatDescriptionCreateForImageBuffer(NULL, pixelBuffer, &videoInfo); NSParameterAssert(result == 0 && videoInfo != NULL); // Create sample buffer. CMSampleBufferRef sampleBuffer = NULL; result = CMSampleBufferCreateForImageBuffer(kCFAllocatorDefault, pixelBuffer, true, NULL, NULL, videoInfo, &timing, &sampleBuffer); NSParameterAssert(result == 0 && sampleBuffer != NULL); // Ship out the frame. NSParameterAssert(CMSampleBufferDataIsReady(sampleBuffer)); NSParameterAssert([writerInput isReadyForMoreMediaData]); BOOL success = [writerInput appendSampleBuffer:frame]; NSParameterAssert(success); // no go :( } </code></pre> <p>P.S. I know there are memory leaks in this code, I’ve omitted some of the code for simplicity.</p>
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<ios><avfoundation><core-video><core-media>
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How do I convert a CGImage to CMSampleBufferRef?
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