CMSampleBufferRef轉換為data數據
- (NSData *)bufferToData:(CMSampleBufferRef)source
{
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(source);
CVPixelBufferLockBaseAddress(imageBuffer,0);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
//? ? size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
void *src_buff = CVPixelBufferGetBaseAddress(imageBuffer);
NSData *data = [NSData dataWithBytes:src_buff length:bytesPerRow * height];
CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
return data;
}
CMSampleBufferRef轉換為image
- (NSData *)bufferToData:(CMSampleBufferRef)source
{
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(source);
CVPixelBufferLockBaseAddress(imageBuffer,0);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
//? ? size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
void *src_buff = CVPixelBufferGetBaseAddress(imageBuffer);
NSData *data = [NSData dataWithBytes:src_buff length:bytesPerRow * height];
CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
return data;
}
// 通過抽樣緩存數據創建一個UIImage對象
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer
{
// 為媒體數據設置一個CMSampleBuffer的Core Video圖像緩存對象
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
// 鎖定pixel buffer的基地址
CVPixelBufferLockBaseAddress(imageBuffer, 0);
// 得到pixel buffer的基地址
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
// 得到pixel buffer的行字節數
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
// 得到pixel buffer的寬和高
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
// 創建一個依賴于設備的RGB顏色空間
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
// 用抽樣緩存的數據創建一個位圖格式的圖形上下文（graphics context）對象
CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8,
bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
// 根據這個位圖context中的像素數據創建一個Quartz image對象
CGImageRef quartzImage = CGBitmapContextCreateImage(context);
// 解鎖pixel buffer
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
// 釋放context和顏色空間
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
// 用Quartz image創建一個UIImage對象image
UIImage *image = [UIImage imageWithCGImage:quartzImage];
// 釋放Quartz image對象
CGImageRelease(quartzImage);
return (image);
}
