Iphone 如何将CMSampleBuffer/UIImage转换为ffmpeg';你的照片是什么?
我正在尝试使用ffmpeg的libav*库将iPhone的摄像头帧编码成H.264视频。我在这发现 如何将CMSampleBuffer转换为UIImage,但如何将其转换为ffmpeg的AVPictureIphone 如何将CMSampleBuffer/UIImage转换为ffmpeg';你的照片是什么?,iphone,ios4,avfoundation,video-encoding,libav,Iphone,Ios4,Avfoundation,Video Encoding,Libav,我正在尝试使用ffmpeg的libav*库将iPhone的摄像头帧编码成H.264视频。我在这发现 如何将CMSampleBuffer转换为UIImage,但如何将其转换为ffmpeg的AVPicture 谢谢。回答我自己的问题: CVImageBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); CVPixelBufferLockBaseAddress(pixelBuffer, 0); // access th
谢谢。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,该缓冲区使用像素格式kCVPixelFormatType_32BGRA
这解决了我的问题。谢谢。调用avpicture_fill()不应该在调用CVPixelBufferUnlockBaseAddress()之前进行,因为前者访问CVImageBufferRef中的原始像素数据?