ffmpeg7.0 将2个aac文件合并。

#include <stdio.h>// 之所以增加__cplusplus的宏定义，是为了同时兼容gcc编译器和g++编译器
#ifdef __cplusplus
extern "C"
{
#endif
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libavutil/avutil.h>
#ifdef __cplusplus
};
#endif#pragma warning(disable:4996)AVFormatContext* pFormatContext[2] = { NULL };
int g_nAudioIndex[2] = {-1};
AVStream* g_pStream[2] = {NULL};
AVCodecContext* g_pCodecContext[2] = {NULL};bool Init(int nIndex, const char* pFileName)
{int nRet = avformat_open_input(&pFormatContext[nIndex], pFileName, NULL, NULL);if (nRet == 0) {nRet = avformat_find_stream_info(pFormatContext[nIndex], NULL);if (nRet >= 0) {g_nAudioIndex[nIndex] = av_find_best_stream(pFormatContext[nIndex], AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);if (g_nAudioIndex[nIndex] >= 0) {g_pStream[nIndex] = pFormatContext[nIndex]->streams[g_nAudioIndex[nIndex]];AVCodecID nCodecID = g_pStream[nIndex]->codecpar->codec_id;const AVCodec* pCodec = avcodec_find_decoder(nCodecID);if (pCodec) {g_pCodecContext[nIndex] = avcodec_alloc_context3(pCodec);nRet = avcodec_parameters_to_context(g_pCodecContext[nIndex], g_pStream[nIndex]->codecpar);if (nRet >= 0) {nRet = avcodec_open2(g_pCodecContext[nIndex], pCodec, NULL);if (nRet == 0) {return true;}}}}} }return false;
}void Uninit(int nIndex)
{avcodec_close(g_pCodecContext[nIndex]);avcodec_free_context(&g_pCodecContext[nIndex]);avformat_close_input(&pFormatContext[nIndex]);avformat_free_context(pFormatContext[nIndex]);
}void _WriteFile(int nIndex, FILE* pFile)
{AVPacket* pPacket = av_packet_alloc();if (pPacket) {while (true) {int nRet = av_read_frame(pFormatContext[nIndex], pPacket);if (nRet < 0) {break;}if (pPacket->stream_index == g_nAudioIndex[nIndex]) {fwrite(pPacket->data, 1, pPacket->size, pFile); // AVPacket已经是一个完整的包，包括aac 数据头和aac 数据块av_packet_unref(pPacket); // 释放buffer}}av_packet_free(&pPacket);}
}int main(int argc, char** argv)
{Init(0, "D:\\123.aac");Init(1, "D:\\234.aac");FILE* pFile = fopen("d:\\1.aac", "wb");_WriteFile(0, pFile);_WriteFile(1, pFile);fclose(pFile);Uninit(0);Uninit(1);return 0;
}

合并后，用网易云音乐app打开，正常播放，时间轴正常。