FFMPEG Example

#include <stdio.h>  
#include <string.h>  
  
extern "C"  
{  
#include "libavformat/avformat.h"  
#include "libavutil/dict.h"  
};  
  
#pragma comment(lib, "avformat.lib")  
#pragma comment(lib, "avutil.lib")  
#pragma comment(lib, "avcodec.lib")  
  
int main()  
{  
    AVFormatContext *pFormatCtx = NULL;  
    AVCodecContext *pCodecCtx = NULL;  
    AVCodec *pCodec;  
    AVDictionaryEntry *dict = NULL;  
      
    int iHour, iMinute, iSecond, iTotalSeconds;//HH:MM:SS  
    int videoIndex, audioIndex;  
  
    char *fileName = "bad.mp4";  
    //char *fileName = "Titanic.ts";  
  
    av_register_all();//注册所有组件  
  
    if (avformat_open_input(&pFormatCtx, fileName, NULL, NULL) != 0)//打开输入视频文件  
    {  
        printf("Couldn't open input stream.\n");  
        return -1;  
    }  
  
    if (avformat_find_stream_info(pFormatCtx, NULL) < 0)  
    {  
        printf("Couldn't find stream information.\n");  
        return -1;  
    }  
  
    videoIndex = -1;  
    for (int i = 0; i < pFormatCtx->nb_streams/*视音频流的个数*/; i++)  
    {  
        if (pFormatCtx->streams[i]/*视音频流*/->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)//查找音频  
        {  
            videoIndex = i;  
            break;  
        }  
    }  
    if (videoIndex == -1)  
    {  
        printf("Couldn't find a video stream.\n");  
        return -1;  
    }  
  
    /** 
    *  不赞成这样使用 
    *  pCodecCtx = pFormatCtx->streams[videoIndex]->codec;    //指向AVCodecContext的指针 
    */  
  
    pCodecCtx = avcodec_alloc_context3(NULL);  
    if (pCodecCtx == NULL)  
    {  
        printf("Could not allocate AVCodecContext\n");  
        return -1;  
    }  
    avcodec_parameters_to_context(pCodecCtx, pFormatCtx->streams[videoIndex]->codecpar);  
  
    pCodec = avcodec_find_decoder(pCodecCtx->codec_id);  //指向AVCodec的指针.查找解码器  
    if (pCodec == NULL)  
    {  
        printf("Codec not found.\n");  
        return -1;  
    }  
    //打开解码器  
    if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0)  
    {  
        printf("Could not open codec.\n");  
        return -1;  
    }  
  
    audioIndex = -1;  
    for (int i = 0; i < pFormatCtx->nb_streams; i++)  
    {  
        if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)  
        {  
            audioIndex = i;  
            break;  
        }  
    }  
    if (audioIndex == -1)  
    {  
        printf("Couldn't find a audio stream.\n");  
        return -1;  
    }  
  
      
  
    //打印结构体信息  
  
    puts("AVFormatContext信息：");  
    puts("---------------------------------------------");  
    printf("文件名：%s\n", pFormatCtx->filename);  
    iTotalSeconds = (int)pFormatCtx->duration/*微秒*/ / 1000000;  
    iHour = iTotalSeconds / 3600;//小时  
    iMinute = iTotalSeconds % 3600 / 60;//分钟  
    iSecond = iTotalSeconds % 60;//秒  
    printf("持续时间：%02d:%02d:%02d\n", iHour, iMinute, iSecond);  
    printf("平均混合码率：%d kb/s\n", pFormatCtx->bit_rate / 1000);  
    printf("视音频个数：%d\n", pFormatCtx->nb_streams);  
    puts("---------------------------------------------");  
  
    puts("AVInputFormat信息:");  
    puts("---------------------------------------------");  
    printf("封装格式名称：%s\n", pFormatCtx->iformat->name);  
    printf("封装格式长名称：%s\n", pFormatCtx->iformat->long_name);  
    printf("封装格式扩展名：%s\n", pFormatCtx->iformat->extensions);  
    printf("封装格式ID：%d\n", pFormatCtx->iformat->raw_codec_id);  
    puts("---------------------------------------------");  
  
    puts("AVStream信息:");  
    puts("---------------------------------------------");  
    printf("视频流标识符：%d\n", pFormatCtx->streams[videoIndex]->index);  
    printf("音频流标识符：%d\n", pFormatCtx->streams[audioIndex]->index);  
    printf("视频流长度：%d微秒\n", pFormatCtx->streams[videoIndex]->duration);  
    printf("音频流长度：%d微秒\n", pFormatCtx->streams[audioIndex]->duration);  
    puts("---------------------------------------------");  
  
    puts("AVCodecContext信息:");  
    puts("---------------------------------------------");  
    printf("视频码率：%d kb/s\n", pCodecCtx->bit_rate / 1000);  
    printf("视频大小：%d * %d\n", pCodecCtx->width, pCodecCtx->height);  
    puts("---------------------------------------------");  
  
    puts("AVCodec信息:");  
    puts("---------------------------------------------");  
    printf("视频编码格式：%s\n", pCodec->name);  
    printf("视频编码详细格式：%s\n", pCodec->long_name);  
    puts("---------------------------------------------");  
  
    printf("视频时长：%d微秒\n", pFormatCtx->streams[videoIndex]->duration);  
    printf("音频时长：%d微秒\n", pFormatCtx->streams[audioIndex]->duration);  
    printf("音频采样率：%d\n", pFormatCtx->streams[audioIndex]->codecpar->sample_rate);  
    printf("音频信道数目：%d\n", pFormatCtx->streams[audioIndex]->codecpar->channels);  
  
    puts("AVFormatContext元数据：");  
    puts("---------------------------------------------");  
    while (dict = av_dict_get(pFormatCtx->metadata, "", dict, AV_DICT_IGNORE_SUFFIX))  
    {  
        printf("[%s] = %s\n", dict->key, dict->value);  
    }  
    puts("---------------------------------------------");  
  
    puts("AVStream视频元数据：");  
    puts("---------------------------------------------");  
    dict = NULL;  
    while (dict = av_dict_get(pFormatCtx->streams[videoIndex]->metadata, "", dict, AV_DICT_IGNORE_SUFFIX))  
    {  
        printf("[%s] = %s\n", dict->key, dict->value);  
    }  
    puts("---------------------------------------------");  
  
    puts("AVStream音频元数据：");  
    puts("---------------------------------------------");  
    dict = NULL;  
    while (dict = av_dict_get(pFormatCtx->streams[audioIndex]->metadata, "", dict, AV_DICT_IGNORE_SUFFIX))  
    {  
        printf("[%s] = %s\n", dict->key, dict->value);  
    }  
    puts("---------------------------------------------");  
  
  
    av_dump_format(pFormatCtx, -1, fileName, 0);  
    printf("\n\n编译信息：\n%s\n\n", avcodec_configuration());  
  
    avcodec_free_context(&pCodecCtx);  
    //avcodec_close(pCodecCtx);  
    avformat_close_input(&pFormatCtx);  
    return 0;  
}