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前言
本demo是使用的mp4v2来将mp4文件解封装得到h264、aac的#xff0c;目前demo提供的.a静态库文件是在x86_64架构的Ubuntu16.04编译得到的#xff0c;如果想在其他环境下测试demo#xff0c;可以自行编译mp4v2并替换相应的库文件#xff08;libmp4v2.a#…1、README
前言
本demo是使用的mp4v2来将mp4文件解封装得到h264、aac的目前demo提供的.a静态库文件是在x86_64架构的Ubuntu16.04编译得到的如果想在其他环境下测试demo可以自行编译mp4v2并替换相应的库文件libmp4v2.a。
a. 编译
$ make # 或者make DEBUG1打开调试打印信息如果想编译mp4v2则可以参考以下步骤
mp4v2源码下载地址https://github.com/TechSmith/mp4v2
$ tar xjf mp4v2-2.0.0.tar.bz2
$ cd mp4v2-2.0.0/
$ ./configure --prefix$PWD/_install # 交叉编译可参考加上选项: --hostarm-linux-gnueabihf
$ make -j96
$ make installb. 使用
注示例2中的音视频测试源文件是不同步的不影响本demo的解封装。
$ ./mp4v2_unpack_demo
Usage: ./mp4v2_unpack_demo ./avfile/test1.mp4 ./test1_out.h264 ./test1_out.aac./mp4v2_unpack_demo ./avfile/test2.mp4 ./test2_out.h264 ./test2_out.aacc. 参考文章 01.mp4v2应用—mp4转h264 - wade_linux - 博客园.mhtml mp4文件格式解析 - 简书 MP4格式详解_DONGHONGBAI的专栏-CSDN博客 使用mp4v2解码mp4转成h264码流和aac码流_lq496387202的博客-CSDN博客_mp4v2解码
d. demo目录结构
.
├── avfile
│ ├── test1.mp4
│ ├── test1_out.aac
│ ├── test1_out.h264
│ ├── test2.mp4
│ ├── test2_out.aac
│ └── test2_out.h264
├── docs
│ ├── 01.mp4v2应用—mp4转h264 - wade_linux - 博客园.mhtml
│ ├── mp4文件格式解析 - 简书.mhtml
│ ├── MP4格式详解_DONGHONGBAI的专栏-CSDN博客.mhtml
│ └── 使用mp4v2解码mp4转成h264码流和aac码流_lq496387202的博客-CSDN博客_mp4v2解码.mhtml
├── include
│ └── mp4v2
│ ├── chapter.h
│ ├── file.h
│ ├── file_prop.h
│ ├── general.h
│ ├── isma.h
│ ├── itmf_generic.h
│ ├── itmf_tags.h
│ ├── mp4v2.h
│ ├── platform.h
│ ├── project.h
│ ├── sample.h
│ ├── streaming.h
│ ├── track.h
│ └── track_prop.h
├── lib
│ └── libmp4v2.a
├── main.c
├── Makefile
└── README.md2、主要代码片段
main.c
#include stdio.h
#include string.h
#include stdlib.h
#include unistd.h#include mp4v2/mp4v2.h// 编译时Makefile里控制
#ifdef ENABLE_DEBUG#define DEBUG(fmt, args...) printf(fmt, ##args)
#else#define DEBUG(fmt, args...)
#endifint unpackMp4File(char *mp4FileName, char *videoFileName, char *audioFileName);unsigned char g_sps[64] {0};
unsigned char g_pps[64] {0};
unsigned int g_spslen 0;
unsigned int g_ppslen 0;int main(int argc, char **argv)
{if(argc 2){printf(Usage: \n %s ./avfile/test1.mp4 ./test1_out.h264 ./test1_out.aac\n %s ./avfile/test2.mp4 ./test2_out.h264 ./test2_out.aac\n,argv[0], argv[0]);return -1;}int ret unpackMp4File(argv[1], argv[2], argv[3]);if(ret 0){printf(\033[32mSuccess!\033[0m\n);}else{printf(\033[31mFailed!\033[0m\n);}return 0;
}int getH264Stream(MP4FileHandle mp4Handler, int videoTrackId, int totalSamples, char *saveFileName)
{// 调用的接口要传的参数uint32_t curFrameIndex 1; // MP4ReadSample函数的参数要求是从1开始但我们打印帧下标还是从0开始uint8_t *pData NULL;uint32_t nSize 0;MP4Timestamp pStartTime;MP4Duration pDuration;MP4Duration pRenderingOffset;bool pIsSyncSample 0;// 写文件要用的参数char naluHeader[4] {0x00, 0x00, 0x00, 0x01};FILE *fpVideo NULL;if(!mp4Handler)return -1;fpVideo fopen(saveFileName, wb); if (fpVideo NULL){printf(open file(%s) error!\n, saveFileName);return -1;}while(curFrameIndex totalSamples){ // 如果传入MP4ReadSample的视频pData是null它内部就会new 一个内存// 如果传入的是已知的内存区域则需要保证空间bigger then max frames size.MP4ReadSample(mp4Handler, videoTrackId, curFrameIndex, pData, nSize, pStartTime, pDuration, pRenderingOffset, pIsSyncSample);DEBUG([\033[35mvideo\033[0m] );if(pIsSyncSample){DEBUG(IDR\t);fwrite(naluHeader, 4, 1, fpVideo);fwrite(g_sps, g_spslen, 1, fpVideo);fwrite(naluHeader, 4, 1, fpVideo);fwrite(g_pps, g_ppslen, 1, fpVideo);}else{DEBUG(SLICE\t);}if(pData nSize 4){// MP4ReadSample函数的参数要求是从1开始但我们打印帧下标还是从0开始而大小已经包含了4字节的start code长度DEBUG(frame index: %d\t size: %d\n, curFrameIndex - 1, nSize);fwrite(naluHeader, 4, 1, fpVideo);fwrite(pData 4, nSize - 4, 1, fpVideo); // pData4了那nSize就要-4}free(pData);pData NULL;curFrameIndex;} fflush(fpVideo);fclose(fpVideo); return 0;
}int getAACStream(MP4FileHandle mp4Handler, int audioTrackId, int totalSamples, char *saveFileName)
{// 调用的接口要传的参数uint32_t curFrameIndex 1; // MP4ReadSample函数的参数要求是从1开始但我们打印帧下标还是从0开始uint8_t *pData NULL;uint32_t nSize 0;// 写文件要用的参数FILE *fpAudio NULL;if(!mp4Handler)return -1;fpAudio fopen(saveFileName, wb);if (fpAudio NULL){printf(open file(%s) error!\n, saveFileName);return -1;}while(curFrameIndex totalSamples){// 如果传入MP4ReadSample的音频pData是null它内部就会new 一个内存// 如果传入的是已知的内存区域则需要保证空间bigger then max frames size.MP4ReadSample(mp4Handler, audioTrackId, curFrameIndex, pData, nSize, NULL, NULL, NULL, NULL);DEBUG([\033[36maudio\033[0m] );if(pData){ DEBUG(frame index: %d\t size: %d\n, curFrameIndex - 1, nSize);fwrite(pData, nSize, 1, fpAudio);}free(pData);pData NULL;curFrameIndex;} fflush(fpAudio);fclose(fpAudio); return 0;
}int unpackMp4File(char *mp4FileName, char *videoFileName, char *audioFileName)
{MP4FileHandle mp4Handler 0;uint32_t trackCnt 0; int videoTrackId -1;int audioTrackId -1;unsigned int videoSampleCnt 0;unsigned int audioSampleCnt 0;mp4Handler MP4Read(mp4FileName);if (mp4Handler 0){printf(MP4Read(%s) error!\n, mp4FileName);return -1;}trackCnt MP4GetNumberOfTracks(mp4Handler, NULL, 0); //获取音视频轨道数printf(****************************\n);printf(trackCnt: %d\n, trackCnt);for (int i 0; i trackCnt; i){// 获取trackId判断获取数据类型: 1-获取视频数据2-获取音频数据MP4TrackId trackId MP4FindTrackId(mp4Handler, i, NULL, 0);const char* trackType MP4GetTrackType(mp4Handler, trackId);if (MP4_IS_VIDEO_TRACK_TYPE(trackType)){// 不关心只是打印出来看看MP4Duration duration 0;uint32_t timescale 0;videoTrackId trackId;duration MP4GetTrackDuration(mp4Handler, videoTrackId);timescale MP4GetTrackTimeScale(mp4Handler, videoTrackId);videoSampleCnt MP4GetTrackNumberOfSamples(mp4Handler, videoTrackId);printf(video params: \n - trackId: %d\n - duration: %lu\n - timescale: %d\n - samples count: %d\n,videoTrackId, duration, timescale, videoSampleCnt);// 读取 sps/pps uint8_t **seqheader; uint32_t *seqheadersize;uint8_t **pictheader;uint32_t *pictheadersize;MP4GetTrackH264SeqPictHeaders(mp4Handler, videoTrackId, seqheader, seqheadersize, pictheader, pictheadersize);// 获取spsfor (int ix 0; seqheadersize[ix] ! 0; ix){memcpy(g_sps, seqheader[ix], seqheadersize[ix]);g_spslen seqheadersize[ix];free(seqheader[ix]);}free(seqheader);free(seqheadersize);// 获取ppsfor (int ix 0; pictheader[ix] ! 0; ix){memcpy(g_pps, pictheader[ix], pictheadersize[ix]);g_ppslen pictheadersize[ix];free(pictheader[ix]);}free(pictheader);free(pictheadersize);}else if (MP4_IS_AUDIO_TRACK_TYPE(trackType)){audioTrackId trackId;audioSampleCnt MP4GetTrackNumberOfSamples(mp4Handler, audioTrackId);printf(audio params: \n - trackId: %d\n - samples count: %d\n,audioTrackId, audioSampleCnt);}}printf(****************************\n);// 解析完了mp4主要是为了获取sps pps 还有video的trackIDif(videoTrackId 0){getH264Stream(mp4Handler, videoTrackId, videoSampleCnt, videoFileName); }if(audioTrackId 0){getAACStream(mp4Handler, audioTrackId, audioSampleCnt, audioFileName);}// 需要mp4close 否则在嵌入式设备打开mp4上多了会内存泄露挂掉.MP4Close(mp4Handler, 0);return 0;
}
3、demo下载地址任选一个
https://download.csdn.net/download/weixin_44498318/89526730https://gitee.com/linriming/av_mp4_unpack_with_mp4v2.githttps://github.com/linriming20/av_mp4_unpack_with_mp4v2.git
