MP4 Muxer

一、mp4的几种封装方案

1、ffmpeg

2、mp4v2

3、gpac

https://blog.csdn.net/LLL347/article/details/85886975

https://blog.csdn.net/weixin_43549602/article/details/84571906

 

二、mp4v2

通过EasyAACEncoder + mp4v2, 根据两位老哥的代码，整合了个demo.

main.cpp

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "EasyAACEncoderAPI.h"
#include "mp4v2.h"
#include "util.h"

/*test file*/
static off_t file_size;

static char* get_h264_frame(char* raw_file)
{
    int raw_fd = open(raw_file, O_RDONLY);
    if (raw_fd < 0) {
        printf("open h264 raw file %s failed.\n", raw_file);
        return nullptr;
    }
    
    file_size = lseek(raw_fd, 0, SEEK_END);
    if (file_size <= 0) {
        printf("h264 raw file %s empty.\n", raw_file);
        return nullptr;
    }
    
    char*h264_raw = (char*)malloc(file_size);
    if (!h264_raw) {
        printf("alloc raw buffer failed for file %s.\n", raw_file);
        return nullptr;
    }
    
    lseek(raw_fd, 0, SEEK_SET);
    ssize_t nb_read = 0;
    if ((nb_read = read(raw_fd, h264_raw, file_size)) != file_size) {
        printf("buffer %s failed, expect=%dKB, actual=%dKB.\n", 
            raw_file, (int)(file_size / 1024), (int)(nb_read / 1024));
        return nullptr;
    }

    close(raw_fd);

    return h264_raw; 
}

/*example*/
int main(int argc, char** argv)
{
    int fps = 25;

    /*g711 data source*/
    int n = 0;
    char g711a[320];
    FILE *infile=fopen("./doc/stream-file/8k_1_16.g711a","rb");
    
    /*g711_to_aac*/
    InitParam initParam;
    initParam.u32AudioSamplerate=8000;
    initParam.ucAudioChannel=1;
    initParam.u32PCMBitSize=16;
    initParam.ucAudioCodec = Law_ALaw;
    Easy_Handle handle = Easy_AACEncoder_Init(initParam);
    int bAACBufferSize = 4*1024;
    unsigned char *pbAACBuffer = (unsigned char*)malloc(bAACBufferSize * sizeof(unsigned char));  
    unsigned int aac_len = 0;

    /*Create */
    //MP4FileHandle mp4 = MP4CreateEx("test.mp4", MP4_DETAILS_ALL, 0, 1, 1, 0, 0, 0, 0);
    MP4FileHandle mp4 = MP4Create("test.mp4", 0);
    MP4SetTimeScale(mp4, 90000);

    /*Set video*/
    MP4TrackId video = MP4AddH264VideoTrack(mp4, 90000, 90000 / fps, 640, 480,
                                            0x64, //sps[1] AVCProfileIndication
                                            0x00, //sps[2] profile_compat
                                            0x1f, //sps[3] AVCLevelIndication
                                            3);
    MP4SetVideoProfileLevel(mp4, 0x7F);

    /*Set audio*/
    MP4TrackId audio = MP4AddAudioTrack(mp4, 8000, 1024, MP4_MPEG4_AUDIO_TYPE);
    MP4SetAudioProfileLevel(mp4, 0x2);

    while(1){

        if(fread(g711a,1,320,infile) > 0)
        {

            if(Easy_AACEncoder_Encode(handle, (unsigned char*)g711a, 320, pbAACBuffer, &aac_len) > 0)
            {
                dump_bin("ttt.aac",(char*)pbAACBuffer, aac_len);
                MP4WriteSample(mp4, audio, pbAACBuffer, aac_len, MP4_INVALID_DURATION, 0, 1);
            }

        }else{
            fseek(infile, 0, SEEK_SET);
            continue;
        }

        char str[32];
        sprintf(str,"./doc/stream-file/h264_3/%d",n); 
        char* h264_raw = get_h264_frame(str);   
        if(h264_raw != nullptr){
            MP4WriteSample(mp4,video , (uint8_t*)h264_raw, file_size, MP4_INVALID_DURATION, 0, 1);
        }
                                
        free(h264_raw);
        if(++n > 311) break;

    }

    Easy_AACEncoder_Release(handle);
    free(pbAACBuffer);
    MP4Close(mp4);

    return 0;
}

 

 Makefile

APP = main

INCLUDE = \
-I ./lib/EasyAACEncoder/include \
-I ./lib/mp4v2/include \
-I ./lib/mp4v2/include/mp4v2 \
-I ./lib/util

LIB = \
./lib/EasyAACEncoder/lib/libEasyAACEncoder.a \
./lib/mp4v2/lib/libmp4v2.a


SRC  = main.cpp \
./lib/util/util.c

CFLAGS = -g -O0 -std=c++11 -lstdc++

LDFLAGS = -lpthread -lz

out: 
    g++ $(SRC) -o $(APP) $(LIB) $(INCLUDE) $(CFLAGS) $(LDFLAGS)

clean:
    rm -rf *o *.out $(APP)

 

封装一下

 

参考

1. 先是随手一搜，看起来应该很简单，不过mp4v2只是勉强能用，最好还是用ffmpeg

https://blog.csdn.net/lipku/article/details/78138645

https://github.com/EasyDarwin/EasyAACEncoder

 

三、ffmpeg

1. mp4 muxer

https://github.com/slmax2017/ffmpeg_mp4_h264_mux

 

end