请教个问题,关于视频数据回调

[spchziee]

• 我想把视频流录制下来,当视频流是640480时,保存正常.当视频流是800600时,保存下来的视频就偏移了,视频就乱了.

• 测试后发现当我把800宽的视频流当成每行832个像素来处理时,Y色块的值正常了.但UV色块始终会有偏差,实在是找不出为什么,请大神们指教

  self.ksyPlayer.videoDataBlock = ^(CMSampleBufferRef pixelBuffer) {
              if(weakSelf.bRecording){
                  CMSampleBufferRef newBuffer = [weakSelf createVideoSample:pixelBuffer];
                  //这里只是做个测试,如果只是为了保存一样的数据,那自然是把pixelBuffer传进去就好了
                  [weakSelf.recordSdk addVideoData:newBuffer];
                  CFRelease(newBuffer);
              }
          };

  -(CMSampleBufferRef) createVideoSample:(CMSampleBufferRef) pixelBuffer{
  CVPixelBufferRef realBuffer = CMSampleBufferGetImageBuffer(pixelBuffer);
  size_t oriWidth = CVPixelBufferGetWidth(realBuffer);
  size_t oriHeight = CVPixelBufferGetHeight(realBuffer);
  
  CGSize size = CGSizeMake(oriWidth, oriHeight);
  const void *keys[] = {
      kCVPixelBufferOpenGLESCompatibilityKey,
      kCVPixelBufferIOSurfacePropertiesKey,
  };
  const void *values[] = {
      (__bridge const void *)([NSNumber numberWithBool:YES]),
      (__bridge const void *)([NSDictionary dictionary]),
  };
  
  OSType oriformatType = CVPixelBufferGetPixelFormatType(realBuffer);
  CFDictionaryRef optionsDictionary = CFDictionaryCreate(NULL, keys, values, 2, NULL, NULL);
  CVPixelBufferRef newPixelBuffer = NULL;
  CVPixelBufferCreate(kCFAllocatorDefault,
                      size.width,
                      size.height,
                      oriformatType,
                      optionsDictionary,
                      &newPixelBuffer);
  CFRelease(optionsDictionary);
  
  CVPixelBufferLockBaseAddress( newPixelBuffer,0);
  CVPixelBufferLockBaseAddress( realBuffer,0);
  
  UInt8 *oriPixel = (UInt8 *)CVPixelBufferGetBaseAddressOfPlane(realBuffer,0);
  UInt8 *oriPixelUV = (UInt8 *)CVPixelBufferGetBaseAddressOfPlane(realBuffer,1);
  size_t oriPerRow = CVPixelBufferGetBytesPerRow(realBuffer);
  
  size_t newWidth = CVPixelBufferGetWidth(newPixelBuffer);
  size_t newHeight = CVPixelBufferGetHeight(newPixelBuffer);
  UInt8 *newPixel = (UInt8 *)CVPixelBufferGetBaseAddressOfPlane(newPixelBuffer,0);
  UInt8 *newPixelUV = (UInt8 *)CVPixelBufferGetBaseAddressOfPlane(newPixelBuffer,1);
  size_t newPerRow = CVPixelBufferGetBytesPerRow(newPixelBuffer);
  
  NSLog(@"录制 ORIvideo (%luX%lu) NEWvideo (%luX%lu)",oriWidth,oriHeight,newWidth,newHeight);
  /*
   800X600时  newPerRow=1204  oriPerRow=1276
   640X480时  newPerRow=964  oriPerRow=972
   */
  memcpy(newPixel, oriPixel, newWidth*newHeight);
  memcpy(newPixelUV, oriPixelUV, newWidth*newHeight/2);
  
  CVPixelBufferUnlockBaseAddress(realBuffer, 0);
  CVPixelBufferUnlockBaseAddress(newPixelBuffer, 0);
  
  CMVideoFormatDescriptionRef videoInfo = NULL;
  OSStatus result = CMVideoFormatDescriptionCreateForImageBuffer(NULL, newPixelBuffer, &videoInfo);
  CMSampleBufferRef sout = nil;
  CMSampleTimingInfo timimgInfo = kCMTimingInfoInvalid;
  CMSampleBufferGetSampleTimingInfo(pixelBuffer, 0, &timimgInfo);
  CMSampleBufferCreateForImageBuffer(kCFAllocatorDefault, newPixelBuffer, true, NULL, NULL, videoInfo, &timimgInfo, &sout);
  CFRelease(videoInfo);
  CFRelease(newPixelBuffer);
  return sout;
  }

[mayudong1]

YUV数据有个术语叫做stride还是linesize的，这个值表示每行的数据个数，这个值并不一定是图像的宽度，一般会比宽度大几个字节，YUV三个分量都是，出现颜色偏差应该是这个没有处理好
试试那个memcpy一行一行的做，看看效果

[spchziee]

最后实验下来发现宽需要的是64的倍数,图像格式是NV12.UV每行也是64的倍数.谢谢 @mayudong1