如何将CMSampleBuffer / UIImage转换为ffmpeg的AVPicture?

时间:2010-12-21 12:20:16

标签: iphone ios4 avfoundation video-encoding libav

我正在尝试使用ffmpeg的libav *库将iPhone的相机帧编码为H.264视频。我发现了这个 Apple's article如何将CMSampleBuffer转换为UIImage,但如何将其转换为ffmpeg的AVPicture?

感谢。

1 个答案:

答案 0 :(得分:14)

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填充了样本缓冲区的内容,该内容使用像素格式kCVPixelFormatType_32BGRA

这解决了我的问题。感谢。