1. 交叉編譯mp4v2
下載合適版本的mp2v2源碼,我下載的是2.0.0的bz包mp4v2_2.0.0~dfsg0.orig.tar.bz2
tar jxf mp4v2_2.0.0~dfsg0.orig.tar.bz2
cd mp4v2-2.0.0;./configure --host=arm-hisiv500-linux CC=arm-hisiv500-linux-gcc CXX=arm-hisiv500-linux-g++ --disable-debug
make
./configure --host=arm-hisiv200-linux CC=arm-hisiv200-linux-gcc CXX=arm-hisiv200-linux-g++ --disable-debug --disable-option-checking --enable-optimize --disable-fvisibility --disable-gch --disable-largefile --disable-cygwin-win32 --
disable-mingw-threads --disable-dependency-tracking --disable-libtool-lock
生成的libmp4v2.a在目錄.libs
頭文件位於include/mp4v2目錄,頭文件需要拷貝完全,代碼中僅需要包含mp4v2.h
#include "mp4v2/mp4v2.h"
1
注意:移植後,鏈接libmp4v2.a需要加上-lstdc++選項。
2. sample代碼
1. 首先調用MP4CreateEx()函數,創建輸出的MP4文件
MP4FileHandle file = MP4CreateEx("test.mp4", 0, 1, 1, "isom", 0x00000200, p, 4);
2. 接下來設置timescale
MP4SetTimeScale(file, 90000);
3. 接下來添加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. 接下來添加audio track
MP4TrackId audio = MP4AddAudioTrack(file, 16000, 1024, MP4_MPEG4_AUDIO_TYPE);
MP4SetAudioProfileLevel(file, 0x2);
5. 現在創建工作結束了,之後就是循環寫入video和audio數據,寫video和audio的函數分別是
MP4WriteSample(file, video, buf, size, MP4_INVALID_DURATION, 0, 1);
MP4WriteSample(file, audio, buf, size, MP4_INVALID_DURATION, 0, 1);
6. 接下來需要爲video添加SPS和PPS信息
MP4AddH264SequenceParameterSet(file, video, sps_pps, 10);
MP4AddH264PictureParameterSet(file, video, sps_pps+10, 4);
7.最後遍歷爲MP4添加索引
MP4Close(file, 0);
8.調用實例 以上爲mp4庫的調用流程,video和audio的buf需要自己寫測試函數傳進來,SPS和PPS需要預先知道。
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.\n");
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.\n");
return;
}
MP4SetVideoProfileLevel(file, 0x7F);
//添加aac音頻
MP4TrackId audio = MP4AddAudioTrack(file, 16000, 1024, MP4_MPEG4_AUDIO_TYPE);
if (video == MP4_INVALID_TRACK_ID)
{
printf("add audio track failed.\n");
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;
}