介紹
在本系列，我打算花大篇幅講解我的 gitee 項目音視頻播放器，在這個項目，您可以學到音視頻解封裝，解碼，SDL渲染相關的知識。您對源代碼感興趣的話，請查看基于FFmpeg和SDL的音視頻播放器
如果您不理解本文，可參考我的前一篇文章音視頻項目—基于FFmpeg和SDL的音視頻播放器解析（二十一）
解析
我們播放器所有的類已經解析完了，我們來看一下 main 函數如何使用函數，實現音視頻的播放。
#include <iostream>
#include "log.h"
#include "demuxthread.h"
#include "avframequeue.h"
#include "decodethread.h"
#include "audiooutput.h"
#include "videooutput.h"
using namespace std;#undef main
int main(int argc, char *argv[])
{int ret = 0;cout << "Hello World!" << endl;LogInit();// queueAVPacketQueue audio_packet_queue;AVPacketQueue video_packet_queue;AVFrameQueue audio_frame_queue;AVFrameQueue video_frame_queue;AVSync avsync;avsync.InitClock();//1 .解復用DemuxThread *demux_thread = new DemuxThread(&audio_packet_queue, &video_packet_queue);ret = demux_thread->Init(argv[1]);if(ret < 0) {LogError("demux_thread.Init failed");return -1;}ret = demux_thread->Start();if(ret < 0) {LogError("demux_thread.Start() failed");return -1;}// 解碼線程初始化DecodeThread *audio_decode_thread = new DecodeThread(&audio_packet_queue, &audio_frame_queue);ret = audio_decode_thread->Init(demux_thread->AudioCodecParameters());if(ret < 0) {LogError("audio_decode_thread->Init() failed");return -1;}ret = audio_decode_thread->Start();if(ret < 0) {LogError("audio_decode_thread->Start() failed");return -1;}DecodeThread *video_decode_thread = new DecodeThread(&video_packet_queue, &video_frame_queue);ret = video_decode_thread->Init(demux_thread->VideoCodecParameters());if(ret < 0) {LogError("video_decode_thread->Init() failed");return -1;}ret = video_decode_thread->Start();if(ret < 0) {LogError("video_decode_thread->Start() failed");return -1;}// 初始化audio輸出AudioParams audio_params = {0};memset(&audio_params, 0, sizeof(AudioParams));audio_params.channels = demux_thread->AudioCodecParameters()->channels;audio_params.channel_layout = demux_thread->AudioCodecParameters()->channel_layout;audio_params.fmt = (enum AVSampleFormat) demux_thread->AudioCodecParameters()->format;audio_params.freq = demux_thread->AudioCodecParameters()->sample_rate;audio_params.frame_size =demux_thread->AudioCodecParameters()->frame_size;AudioOutput *audio_output = new AudioOutput(&avsync, demux_thread->AudioStreamTimebase(), audio_params, &audio_frame_queue);ret = audio_output->Init();if(ret < 0) {LogError("audio_output->Init() failed");return -1;}VideoOutput *video_output = new VideoOutput(&avsync, demux_thread->VideoStreamTimebase(),&video_frame_queue, demux_thread->VideoCodecParameters()->width,demux_thread->VideoCodecParameters()->height);ret = video_output->Init();if(ret < 0) {LogError("video_output->Init() failed");return -1;}video_output->MainLoop();// 休眠120秒
// std::this_thread::sleep_for(std::chrono::milliseconds(120*1000));LogInfo("demux_thread->Stop");demux_thread->Stop();LogInfo("delete demux_thread");delete demux_thread;LogInfo("audio_decode_thread->Stop()");audio_decode_thread->Stop();LogInfo("delete audio_decode_thread");delete audio_decode_thread;LogInfo("video_decode_thread->Stop()");video_decode_thread->Stop();LogInfo("delete video_decode_thread");delete video_decode_thread;LogInfo("main finish");return 0;
}
基本流程就是解復用——》解碼——》輸出音頻 / 輸出視頻
好了，未來如果有需要的再深入解析這個 main，現在這個項目先告一段落。
