Question

我尝试使用屏幕上的数据创建H.264压缩会话。我已经创建了一个CGDisplayStreamRef实例，如下所示：

displayStream = CGDisplayStreamCreateWithDispatchQueue(0, 100, 100, k32BGRAPixelFormat, nil, self.screenCaptureQueue, ^(CGDisplayStreamFrameStatus status, uint64_t displayTime, IOSurfaceRef frameSurface, CGDisplayStreamUpdateRef updateRef) {
    //Call encoding session here
});

以下是我目前如何设置编码功能：

- (void) encode:(CMSampleBufferRef )sampleBuffer {
    CVImageBufferRef imageBuffer = (CVImageBufferRef)CMSampleBufferGetImageBuffer(sampleBuffer);
    CMTime presentationTimeStamp = CMTimeMake(frameID++, 1000);
    VTEncodeInfoFlags flags;
    OSStatus statusCode = VTCompressionSessionEncodeFrame(EncodingSession,
                                                          imageBuffer,
                                                          presentationTimeStamp,
                                                          kCMTimeInvalid,
                                                          NULL, NULL, &flags);
    if (statusCode != noErr) {
        NSLog(@"H264: VTCompressionSessionEncodeFrame failed with %d", (int)statusCode);

        VTCompressionSessionInvalidate(EncodingSession);
        CFRelease(EncodingSession);
        EncodingSession = NULL;
        return;
    }
    NSLog(@"H264: VTCompressionSessionEncodeFrame Success");
}

我试图了解如何将数据从屏幕转换为CMSampleBufferRef，以便我可以正确调用我的编码功能。到目前为止，我还无法确定这是否可能，或者是我正在尝试做的正确方法。有没有人有任何建议？

编辑：我已将IOSurface转换为CMBlockBuffer，但尚未找到如何将其转换为{{} 1}}：

CMSampleBufferRef

编辑2

更多进展：

void *mem = IOSurfaceGetBaseAddress(frameSurface);
size_t bytesPerRow = IOSurfaceGetBytesPerRow(frameSurface);
size_t height = IOSurfaceGetHeight(frameSurface);
size_t totalBytes = bytesPerRow * height;

CMBlockBufferRef blockBuffer;

CMBlockBufferCreateWithMemoryBlock(kCFAllocatorNull, mem, totalBytes, kCFAllocatorNull, NULL, 0, totalBytes, 0, &blockBuffer);

Answer 1

可能，我有点迟了但是，它可能对其他人有所帮助：

CGDisplayStreamCreateWithDispatchQueue(CGMainDisplayID(), 100, 100, k32BGRAPixelFormat, nil, self.screenCaptureQueue, ^(CGDisplayStreamFrameStatus status, uint64_t displayTime, IOSurfaceRef frameSurface, CGDisplayStreamUpdateRef updateRef) {
    // The created pixel buffer retains the surface object.
    CVPixelBufferRef pixelBuffer;
    CVPixelBufferCreateWithIOSurface(NULL, frameSurface, NULL, &pixelBuffer);

    // Create the video-type-specific description for the pixel buffer.
    CMVideoFormatDescriptionRef videoFormatDescription;
    CMVideoFormatDescriptionCreateForImageBuffer(NULL, pixelBuffer, &videoFormatDescription);

    // All the necessary parts for creating a `CMSampleBuffer` are ready.
    CMSampleBufferRef sampleBuffer;
    CMSampleTimingInfo timingInfo;
    CMSampleBufferCreateReadyWithImageBuffer(NULL, pixelBuffer, videoFormatDescription, &timingInfo, &sampleBuffer);

    // Do the stuff

    // Release the resources to let the frame surface be reused in the queue
    // `kCGDisplayStreamQueueDepth` is responsible for the size of the queue 
    CFRelease(sampleBuffer);
    CFRelease(pixelBuffer);
});

使用CGDisplayStream编码H.264压缩会话

1 个答案: