如何将CMSampleBuffer/UIImage转换为ffmpeg的AVPicture？

Question

我正在尝试使用ffmpeg的libav*库将iPhone的相机帧编码为H.264视频.我在Apple的文章中发现了 如何将CMSampleBuffer转换为UIImage,但是如何将其转换为ffmpeg的AVPicture？

谢谢.

Answer 1

回答我自己的问题:

CVImageBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(pixelBuffer, 0);

// access the data
int width = CVPixelBufferGetWidth(pixelBuffer);
int height = CVPixelBufferGetHeight(pixelBuffer);
unsigned char *rawPixelBase = (unsigned char *)CVPixelBufferGetBaseAddress(pixelBuffer);

// Do something with the raw pixels here
// ...

// Fill in the AVFrame
CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);

AVFrame *pFrame;
pFrame = avcodec_alloc_frame();

avpicture_fill((AVPicture*)pFrame, rawPixelBase, PIX_FMT_RGB32, width, height);

现在pFrame填写了使用像素格式的样本缓冲区的内容kCVPixelFormatType_32BGRA.

这解决了我的问题.谢谢.