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导入框架和头文件#import <VideoToolbox/VideoToolbox.h>

{//声明的全局变量 NSData *spsData ;    NSData *ppsData;    uint8_t pFrameData[BUFFER_SIZE];    CMVideoFormatDescriptionRef  videoFormatDescription ;    VTDecompressionSessionRef decompressionSession;    VTDecompressionOutputCallback  decompressionSessionDecodeFrameCallback;}-(void)createDecompSession{    VTDecompressionOutputCallbackRecord callBackRecord;    callBackRecord.decompressionOutputCallback = decompressionSessionDecodeFrameCallback;    callBackRecord.decompressionOutputRefCon = (__bridge void *)self;    //attr是传递给decode session的属性词典,两种方式//    NSDictionary *destinationImageBufferAttributes =[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:NO],(id)kCVPixelBufferOpenGLESCompatibilityKey,//                                                     [NSNumber numberWithInt:kCVPixelFormatType_24RGB],(id)kCVPixelBufferPixelFormatTypeKey,nil];    //kCVPixelFormatType_420YpCbCr8BiPlanarFullRange,kCVPixelFormatType_24RGB    //(__bridge CFDictionaryRef)(destinationImageBufferAttributes)    //attr是传递给decode session的属性词典    CFDictionaryRef attrs = NULL;    //kCVPixelBufferPixelFormatTypeKey，指定解码后的图像格式，必须指定成NV12，苹果的硬解码器只支持NV12。    const void *keys[] = { kCVPixelBufferPixelFormatTypeKey };    //      kCVPixelFormatType_420YpCbCr8Planar is YUV420    //      kCVPixelFormatType_420YpCbCr8BiPlanarFullRange is NV12    uint32_t v = kCVPixelFormatType_420YpCbCr8BiPlanarFullRange;    const void *values[] = { CFNumberCreate(NULL, kCFNumberSInt32Type, &v) };    attrs = CFDictionaryCreate(NULL, keys, values, 1, NULL, NULL);    //创建解码session    OSStatus status =  VTDecompressionSessionCreate(kCFAllocatorDefault,                                                    videoFormatDescription,                                                    NULL,                                                   attrs , // attrs, // NULL                                                    &callBackRecord,                                                    &decompressionSession);}-(void)decodeData:(char*)pFromeData Leng:(int)length{    //去掉开始码,提取sps和pps    int naluType = ((uint8_t)pFromeData[4]&0x1f);//    for (int i=0; i

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