MP4V2实现TF卡录制MP４视频

     这里移植mp4v2实现mp4的录制，这里已经实现了海思平台3518和君正平台T30的mp4视频录制，总的来说就是交叉编译mp4v2源码，并移植其lib库实现在不同平台，用mp4v2的API将实时H264流封装成MP4视频文件。（前提你要了解海思，君正等相关soc获取实时h264流的流程）。 

1，关键实现MP４的录制代码如下：

（1）3518ev200海思平台

HI_S32 SAMPLE_COMM_VENC_MP4(VENC_STREAM_S *stStream)
{
	static int nRecordFlag = 0x00;
	static int recording = 0x1;
	static int spsflag = 0;
	static int ppsflag = 0;
	static MP4TrackId video = 0;
	static MP4FileHandle hMP4File = NULL;

	static char recordfish = 0x1;
	
	int j = 0;
	int len = 0;
	char *pData = NULL;
	char isSyncSample = 0;
	
	if(recordfish == 0x00){
		return 0;
	}

	if(hMP4File == NULL){
		hMP4File = MP4CreateEx("/usr/mmc/test.mp4",0, 1, 1, 0, 0, 0, 0);			//文件存储到TF挂载的路径
		if (hMP4File == MP4_INVALID_FILE_HANDLE)	{
			printf("open file fialed.\n");
			return -1;
		}
	
		MP4SetTimeScale(hMP4File, 90000);
	}
	
	if(recording && stStream->u32Seq > 30){			//丢弃前30帧，也可以不丢弃
		if(stStream->u32PackCount >= 3){			//从I帧开始编码，保证文件开始就能播放
			nRecordFlag = 1;
		}
	
		if(nRecordFlag){
			for(j = 0;j < stStream->u32PackCount;j++){
				len 	= stStream->pstPack[j].u32Len - stStream->pstPack[j].u32Offset;
				pData	= (stStream->pstPack[j].pu8Addr + stStream->pstPack[j].u32Offset);						
	
				if(stStream->pstPack[j].DataType.enH264EType == H264E_NALU_SPS){
					if(spsflag == 0x00){
						spsflag = 0x1;
						//写sps
						printf("Write sps =================\n");	
	
	
						video = MP4AddH264VideoTrack(hMP4File, 90000, 90000 / 30, 1280, 720,
																pData[4+1], //sps[1] AVCProfileIndication
																pData[4+2], //sps[2] profile_compat
																pData[4+3], //sps[3] AVCLevelIndication
																3); // 4 bytes length before each NAL unit
							MP4SetVideoProfileLevel(hMP4File, 0x7F);
							MP4AddH264SequenceParameterSet(hMP4File, video, pData+4, len-4);										
					}
					
					continue;
				}
				
				if(stStream->pstPack[j].DataType.enH264EType == H264E_NALU_PPS){
					if(ppsflag == 0x00){
						ppsflag = 0x1;
						//写pps										
						printf("Write pps -------------------\n");										
						MP4AddH264PictureParameterSet(hMP4File, video, pData+4, len-4);
					}
					
					continue;
				}
	
				isSyncSample = (stStream->pstPack[j].DataType.enH264EType == H264E_NALU_ISLICE)	?  (1) : (0);
				pData[0] = (len - 4) >> 24;
				pData[1] = (len - 4) >> 16;
				pData[2] = (len - 4) >> 8;
				pData[3] = len - 4; 							
	
				printf("Write date type = %d  isSyncSample = %d\n",stStream->pstPack[j].DataType.enH264EType,isSyncSample);								
	
				MP4WriteSample(hMP4File, video, pData, len , MP4_INVALID_DURATION, 0, isSyncSample);
	
				
			}					
		}
	}
	
	if((recording && stStream->u32Seq > 900)){		//控制文件时长
		recording = 0x00;
		printf("Close mp4 file\n");						
		MP4Close(hMP4File, 0);
		hMP4File = NULL;
		video = 0;
		recordfish = 0x00;
	}

}

(2)T30君正平台

static int save_stream(int fd, IMPEncoderStream *stream)
{
#if 0
	int ret, i, nr_pack = stream->packCount;

	for (i = 0; i < nr_pack; i++) {
		ret = write(fd, (void *)stream->pack[i].virAddr,
					stream->pack[i].length);
		if (ret != stream->pack[i].length) {
			IMP_LOG_ERR(TAG, "stream write ret(%d) != stream->pack[%d].length(%d) error:%s\n", ret, i, stream->pack[i].length, strerror(errno));
			return -1;
		}
	}
#endif 
	
	static int nRecordFlag = 0x00;
		static int recording = 0x1;
		static int spsflag = 0;
		static int ppsflag = 0;
		static MP4TrackId video = 0;
		static MP4FileHandle hMP4File = NULL;
	
		static char recordfish = 0x1;
		
		int j = 0;
		int len = 0;
		char *pData = NULL;
		char isSyncSample = 0;
		
		if(recordfish == 0x00){
			return 0;
		}
	
		if(hMP4File == NULL){
			hMP4File = MP4CreateEx("./test.mp4",0, 1, 1, 0, 0, 0, 0);			//文件存储到TF卡挂载的路径
			if (hMP4File == MP4_INVALID_FILE_HANDLE)	{
				printf("open file fialed.\n");
				return -1;
			}
		
			MP4SetTimeScale(hMP4File, 90000);
		}
		
		if(recording && stream->seq > 30){ 		//丢弃前30帧，也可以不丢弃
			if(stream->packCount >= 3){			//从I帧开始编码，保证文件开始就能播放
				nRecordFlag = 1;
			}
		
			if(nRecordFlag){
				for(j = 0;j < stream->packCount;j++){
					len 	= stream->pack[j].length;
					pData	= stream->pack[j].virAddr;						
		
					if(stream->pack[j].dataType.h264Type == IMP_H264_NAL_SPS){
						if(spsflag == 0x00){
							spsflag = 0x1;
							//写sps
							printf("Write sps =================\n");	
		
		
							video = MP4AddH264VideoTrack(hMP4File, 90000, 90000 / 30, 1280, 720,
																	pData[4+1], //sps[1] AVCProfileIndication
																	pData[4+2], //sps[2] profile_compat
																	pData[4+3], //sps[3] AVCLevelIndication
																	3); // 4 bytes length before each NAL unit
								MP4SetVideoProfileLevel(hMP4File, 0x7F);
								MP4AddH264SequenceParameterSet(hMP4File, video, pData+4, len-4);										
						}
						
						continue;
					}
					
					if(stream->pack[j].dataType.h264Type == IMP_H264_NAL_PPS){
						if(ppsflag == 0x00){
							ppsflag = 0x1;
							//写pps									
							printf("Write pps -------------------\n");										
							MP4AddH264PictureParameterSet(hMP4File, video, pData+4, len-4);
						}
						
						continue;
					}
		
					isSyncSample = (stream->pack[j].dataType.h264Type == IMP_H264_NAL_SLICE_IDR) ?  (1) : (0);//判断是否是I帧
					pData[0] = (len - 4) >> 24;
					pData[1] = (len - 4) >> 16;
					pData[2] = (len - 4) >> 8;
					pData[3] = len - 4; 							
		
					printf("Write date type = %d  isSyncSample = %d\n",stream->pack[j].dataType.h264Type,isSyncSample); 							
		
					MP4WriteSample(hMP4File, video, pData, len , MP4_INVALID_DURATION, 0, isSyncSample);
		
					
				}					
			}
		}
		
		if((recording && stream->seq > 1000)){		//控制文件时长
			recording = 0x00;
			printf("Close mp4 file\n"); 					
			MP4Close(hMP4File, 0);
			hMP4File = NULL;
			video = 0;
			recordfish = 0x00;
		}
	return 0;
	
}

2，这里给出君正平台下mp4v2的编译移植过程：https://blog.csdn.net/weixin_38251305/article/details/114985672