在VS2017下FFmpeg+SDL编写最简单的视频播放器
1.下载ShiftMediaProject/FFmpeg
2.下载SDL2
3.新建VC++控制台应用
3.配置include和lib
4.把FFmpeg和SDL的dll 复制到工程Debug目录下，并设置调试命令
5.复制一下mp4视频到工程Debug目录下（复制一份到*.vcxproj同一目录，用于调试）
6.编写代码
#include <stdio.h>
#include <stdlib.h>
#include <iostream>extern "C" {
#include "libavcodec\avcodec.h"
#include "libavformat\avformat.h"
#include "libavutil\avutil.h"
#include "SDL.h"
}SDL_Window *window;
SDL_Texture* texture;
SDL_Renderer* renderer;
SDL_Rect rect;
int width;
int height;void display(AVFrame* frame);
void iniSdl();#undef main
int main()
{int ret = -1;AVFormatContext* ctx = avformat_alloc_context();ret = avformat_open_input(&ctx, "my.mp4", NULL, NULL);ret = avformat_find_stream_info(ctx, NULL);int videoindex = -1;for (int i = 0; i < ctx->nb_streams; i++){if (ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO){videoindex = i;break;}}const AVCodec* codec = avcodec_find_decoder(ctx->streams[videoindex]->codecpar->codec_id);AVCodecContext* avcc = avcodec_alloc_context3(codec);ret = avcodec_parameters_to_context(avcc, ctx->streams[videoindex]->codecpar);ret = avcodec_open2(avcc, codec, NULL);width = avcc->width;height = avcc->height;rect.x = 0;rect.y = 0;rect.h = height;rect.w = width;iniSdl();AVFrame* frame = av_frame_alloc();AVPacket* packet = av_packet_alloc();while (true){ret = av_read_frame(ctx, packet);if (ret >=0){if (packet->stream_index == videoindex){ret = avcodec_send_packet(avcc, packet);while (ret >= 0){ret = avcodec_receive_frame(avcc, frame);if (ret >= 0){display(frame);av_frame_unref(frame);}else{av_frame_unref(frame);break;}}} }else{av_packet_unref(packet);break;}}SDL_DestroyWindow(window);std::cout << "finish\n";
}void display(AVFrame* frame)
{SDL_UpdateYUVTexture(texture, &rect, frame->data[0], frame->linesize[0], frame->data[1], frame->linesize[1], frame->data[2], frame->linesize[2]);SDL_RenderClear(renderer);SDL_RenderCopy(renderer, texture, NULL, NULL);SDL_RenderPresent(renderer);
}void iniSdl()
{SDL_Init(SDL_INIT_VIDEO);window = SDL_CreateWindow("test", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, SDL_WINDOW_RESIZABLE);renderer = SDL_CreateRenderer(window, -1, 0);texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, width, height);
}