ffmpeg制作视频播放器（六）读取视频帧，音频帧

pts：显示时间戳*time_base=以秒为单位的显示时间

#include <iostream>
extern "C"{
#include "libavformat/avformat.h"
}
using namespace std;
#pragma comment(lib,"avformat.lib")
#pragma comment(lib,"avutil.lib")
#pragma comment(lib,"avcodec.lib")
static double r2d(AVRational r)
{return r.den == 0 ? 0:(double)r.num / (double)r.den;
}
int main(int argc, char *argv[])
{cout << "Test Demux FFmpeg.club" << endl;const char *path = "001111.mp4";//初始化封装库av_register_all();//初始化网络库 （可以打开rtsp rtmp http 协议的流媒体视频）avformat_network_init();//参数设置AVDictionary *opts = NULL;//设置rtsp流已tcp协议打开av_dict_set(&opts, "rtsp_transport", "tcp", 0);//网络延时时间av_dict_set(&opts, "max_delay", "500", 0);//解封装上下文AVFormatContext *ic = NULL;int re = avformat_open_input(&ic,path,0,  // 0表示自动选择解封器&opts //参数设置，比如rtsp的延时时间);if (re != 0){char buf[1024] = { 0 };av_strerror(re, buf, sizeof(buf) - 1);cout << "open " << path << " failed! :" << buf << endl;getchar();return -1;}cout << "open " << path << " success! " << endl;//获取流信息re = avformat_find_stream_info(ic, 0);//总时长 毫秒int totalMs = ic->duration / (AV_TIME_BASE / 1000);cout << "totalMs = " << totalMs << endl;//打印视频流详细信息av_dump_format(ic,0,path,0);//音视频索引，读取时区分音视频int videoStream = 0;int audioStream = 1;cout << "streams count: " << ic->nb_streams << endl;//获取音视频流信息 （遍历，函数获取）for (int i = 0; i < ic->nb_streams; i++){AVStream *as = ic->streams[i];//音频 AVMEDIA_TYPE_AUDIOif (as->codecpar->codec_type == AVMEDIA_TYPE_AUDIO){audioStream = i;cout <<i<< "音频信息" << endl;cout << "sample_rate = " << as->codecpar->sample_rate << endl;
//            AVSampleFormat;cout << "format = " << as->codecpar->format << endl;cout << "channels = " << as->codecpar->channels << endl;cout << "codec_id = " << as->codecpar->codec_id << endl;cout << "audio fps = " <<r2d(as->avg_frame_rate)<<endl;//一帧数据？？ 单通道样本数cout << "frame_size = " << as->codecpar->frame_size << endl;//1024 * 2 * 2 = 4096  fps = sample_rate/frame_sizecout << "codec_id = " << as->codecpar->codec_id << endl;cout << "format = " << as->codecpar->format << endl;}//视频 AVMEDIA_TYPE_VIDEOelse if (as->codecpar->codec_type == AVMEDIA_TYPE_VIDEO){videoStream = i;cout << i << "视频信息" << endl;cout << "width=" << as->codecpar->width << endl;cout << "height=" << as->codecpar->height << endl;cout << "format = " << as->codecpar->format << endl;//帧率 fps 分数转换cout<<"video fps = " <<r2d(as->avg_frame_rate)<<endl;cout << "codec_id = " << as->codecpar->codec_id << endl;cout << "format = " << as->codecpar->format << endl;}cout <<"----------------"<<endl;}//获取视频流videoStream = av_find_best_stream(ic, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);///ic->streams[videoStream]//malloc AVPacket并初始化AVPacket *pkt = av_packet_alloc();for (;;){int re = av_read_frame(ic, pkt);if(re!=0){//循环播放cout << "==============================end==============================" << endl;int ms = 1000; //三秒位置 根据时间基数（分数）转换long long pos = (double)ms/ (double)1000/r2d(ic->streams[pkt->stream_index]->time_base);cout << "pos" << pos << endl;cout << "num" << ic->streams[pkt->stream_index]->time_base.num;cout << "den" << ic->streams[pkt->stream_index]->time_base.den;av_seek_frame(ic, videoStream, pos, AVSEEK_FLAG_BACKWARD | AVSEEK_FLAG_FRAME);continue;}cout << "pkt->size = "<< pkt->size << endl;//显示的时间cout << "pkt->pts = " << pkt->pts << endl;//转换为毫秒，方便做同步cout << "pkt->pts ms = " << pkt->pts * (r2d(ic->streams[pkt->stream_index]->time_base)*1000) << endl;//解码时间cout << "pkt->dts = " << pkt->dts << endl;if (pkt->stream_index == videoStream){cout << "图像" << endl;}if (pkt->stream_index == audioStream){cout << "音频" << endl;}//释放，引用计数-1 为0释放空间av_packet_unref(pkt);}av_packet_free(&pkt);if (ic){//释放封装上下文，并且把ic置0avformat_close_input(&ic);}getchar();return 0;
}

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ffmpeg制作视频播放器（六）读取视频帧，音频帧

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