嵌入式

linux下利用mp4v2库将h264和aac文件封装成MP4

2019-07-13 07:04发布

站内文章 / 嵌入式Linux
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说在前面的是，我用的mp4v2版本是mp4v2-2.2.0，与之前版本相比接口函数稍有不同！ 1. 首先调用MP4CreateEx（）函数，创建输出的MP4文件 MP4FileHandle file = MP4CreateEx("test.mp4", 0, 1, 1, "isom", 0x00000200, p, 4);
2. 接下来设置timescale MP4SetTimeScale(file, 90000);
3. 接下来添加video track MP4TrackId video = MP4AddH264VideoTrack(file, 90000, 90000/25, 640, 480, 0x4d, //sps[1] AVCProfileIndication 0x40, //sps[2] profile_compat 0x1f, //sps[3] AVCLevelIndication 3); // 4 bytes length before each NAL unit MP4SetVideoProfileLevel(file, 0x7F); 
4. 接下来添加audio track MP4TrackId audio = MP4AddAudioTrack(file, 16000, 1024, MP4_MPEG4_AUDIO_TYPE); MP4SetAudioProfileLevel(file, 0x2);5. 现在创建工作结束了，之后就是循环写入video和audio数据，写video和audio的函数分别是
MP4WriteSample(file, video, buf, size, MP4_INVALID_DURATION, 0, 1); MP4WriteSample(file, audio, buf, size, MP4_INVALID_DURATION, 0, 1); 
6. 接下来需要为video添加SPS和PPS信息 MP4AddH264SequenceParameterSet(file, video, sps_pps, 10); MP4AddH264PictureParameterSet(file, video, sps_pps+10, 4);
7.最后遍历为MP4添加索引 MP4Close(file, 0);
以上为mp4库的调用流程，video和audio的buf需要自己写测试函数传进来，SPS和PPS需要预先知道。 int aa(void) { unsigned char sps_pps[14] = {0x67, 0x4d, 0x40, 0x1F, 0x96 ,0x54, 0x05, 0x01, 0xec, 0x80, 0x68, 0xce, 0x38, 0x80}; char *p[4]; p[0] = "isom"; p[1] = "iso2"; p[2] = "avc1"; p[3] = "mp41"; MP4FileHandle file = MP4CreateEx("test.mp4", 0, 1, 1, "isom", 0x00000200, p, 4); if (file == MP4_INVALID_FILE_HANDLE) { printf("open file fialed. "); return; } MP4SetTimeScale(file, 90000); //添加h264 track MP4TrackId video = MP4AddH264VideoTrack(file, 90000, 90000/25, 640, 480, 0x4d, //sps[1] AVCProfileIndication 0x40, //sps[2] profile_compat 0x1f, //sps[3] AVCLevelIndication 3); // 4 bytes length before each NAL unit if (video == MP4_INVALID_TRACK_ID) { printf("add video track failed. "); return; } MP4SetVideoProfileLevel(file, 0x7F); //添加aac音频 MP4TrackId audio = MP4AddAudioTrack(file, 16000, 1024, MP4_MPEG4_AUDIO_TYPE); if (video == MP4_INVALID_TRACK_ID) { printf("add audio track failed. "); return; } MP4SetAudioProfileLevel(file, 0x2); while(mp4_read_h264_frame(fpMjpeg, buf, MP4_BUF_SIZE, &size) != -1) { buf[0] = ((size-4) & 0xff000000) >> 24; buf[1] = ((size-4) & 0x00ff0000) >> 16; buf[2] = ((size-4) & 0x0000ff00) >> 8; buf[3] = (size-4) & 0x000000ff; MP4WriteSample(file, video, buf, size, MP4_INVALID_DURATION, 0, 1); } while(-1 != mp4_read_aac_frame(fpPcm, buf, MP4_BUF_SIZE, &size)) { MP4WriteSample(file, audio, buf, size, MP4_INVALID_DURATION, 0, 1); } MP4AddH264SequenceParameterSet(file, video, sps_pps, 10); MP4AddH264PictureParameterSet(file, video, sps_pps+10, 4); MP4Close(file, 0); return 0; }

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