如何将CMSampleBuffer / UIImage转换为ffmpeg的AVPicture？ [英] How to Convert CMSampleBuffer/UIImage into ffmpeg's AVPicture?

问题描述

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

I'm trying to encode iPhone's camera frames into a H.264 video using ffmpeg's libav* libraries. I found in this Apple's article how to convert CMSampleBuffer to UIImage, but how can I convert it to ffmpeg's AVPicture?

谢谢。

推荐答案

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 已填入内容样本缓冲区，使用像素格式 kCVPixelFormatType_32BGRA 。

Now pFrame is filled in with the content of sample buffer, which is using the pixel format kCVPixelFormatType_32BGRA.

这解决了我的问题。谢谢。

This solved my issue. Thanks.

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