Android 音视频学习基础——1.6 ffmpeg 简单视频播放器

代码：

/**
 * 最简单的基于FFmpeg的视频播放器2(SDL升级版)
 * Simplest FFmpeg Player 2(SDL Update)
 * 本程序实现了视频文件的解码和显示(支持HEVC，H.264，MPEG2等)。
 * 是最简单的FFmpeg视频解码方面的教程。
 * 通过学习本例子可以了解FFmpeg的解码流程。
 * 本版本中使用SDL消息机制刷新视频画面。
 * This software is a simplest video player based on FFmpeg.
 * Suitable for beginner of FFmpeg.
 *
 */
#include <stdio.h>
#define __STDC_CONSTANT_MACROS
extern "C"
{
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "SDL2/SDL.h"
};
//Refresh Event
#define SFM_REFRESH_EVENT (SDL_USEREVENT + 1)
#define SFM_BREAK_EVENT (SDL_USEREVENT + 2)
int thread_exit=0;
int sfp_refresh_thread(void *opaque){
 thread_exit=0;
 while (!thread_exit) {
 SDL_Event event;
 event.type = SFM_REFRESH_EVENT;
 SDL_PushEvent(&event);
 SDL_Delay(40);
 }
 thread_exit=0;
 //Break
 SDL_Event event;
 event.type = SFM_BREAK_EVENT;
 SDL_PushEvent(&event);
 return 0;
}
int main(int argc, char* argv[])
{
 AVFormatContext *pFormatCtx;
 int i, videoindex;
 AVCodecContext *pCodecCtx;
 AVCodec *pCodec;
 AVFrame *pFrame,*pFrameYUV;
 uint8_t *out_buffer;
 AVPacket *packet;
 int ret, got_picture;
 //------------SDL----------------
 int screen_w,screen_h;
 SDL_Window *screen; 
 SDL_Renderer* sdlRenderer;
 SDL_Texture* sdlTexture;
 SDL_Rect sdlRect;
 SDL_Thread *video_tid;
 SDL_Event event;
 struct SwsContext *img_convert_ctx;
 char filepath[]="屌丝男士.mov";
 av_register_all();
 avformat_network_init();
 pFormatCtx = avformat_alloc_context();
 if(avformat_open_input(&pFormatCtx,filepath,NULL,NULL)!=0){
 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(i=0; i<pFormatCtx->nb_streams; i++) 
 if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
 videoindex=i;
 break;
 }
 if(videoindex==-1){
 printf("Didn't find a video stream.\n");
 return -1;
 }
 pCodecCtx=pFormatCtx->streams[videoindex]->codec;
 pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
 if(pCodec==NULL){
 printf("Codec not found.\n");
 return -1;
 }
 if(avcodec_open2(pCodecCtx, pCodec,NULL)<0){
 printf("Could not open codec.\n");
 return -1;
 }
 pFrame=av_frame_alloc();
 pFrameYUV=av_frame_alloc();
 out_buffer=(uint8_t *)av_malloc(avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height));
 avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
 
 img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, 
 pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL); 
 
 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER)) { 
 printf( "Could not initialize SDL - %s\n", SDL_GetError()); 
 return -1;
 } 
 //SDL 2.0 Support for multiple windows
 screen_w = pCodecCtx->width;
 screen_h = pCodecCtx->height;
 screen = SDL_CreateWindow("Simplest ffmpeg player's Window", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
 screen_w, screen_h,SDL_WINDOW_OPENGL);
 if(!screen) { 
 printf("SDL: could not create window - exiting:%s\n",SDL_GetError()); 
 return -1;
 }
 sdlRenderer = SDL_CreateRenderer(screen, -1, 0); 
 //IYUV: Y + U + V (3 planes)
 //YV12: Y + V + U (3 planes)
 sdlTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING,pCodecCtx->width,pCodecCtx->height); 
 sdlRect.x=0;
 sdlRect.y=0;
 sdlRect.w=screen_w;
 sdlRect.h=screen_h;
 packet=(AVPacket *)av_malloc(sizeof(AVPacket));
 video_tid = SDL_CreateThread(sfp_refresh_thread,NULL,NULL);
 //------------SDL End------------
 //Event Loop
 
 for (;;) {
 //Wait
 SDL_WaitEvent(&event);
 if(event.type==SFM_REFRESH_EVENT){
 //------------------------------
 if(av_read_frame(pFormatCtx, packet)>=0){
 if(packet->stream_index==videoindex){
 ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
 if(ret < 0){
 printf("Decode Error.\n");
 return -1;
 }
 if(got_picture){
 sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
 //SDL---------------------------
 SDL_UpdateTexture( sdlTexture, NULL, pFrameYUV->data[0], pFrameYUV->linesize[0] ); 
 SDL_RenderClear( sdlRenderer ); 
 //SDL_RenderCopy( sdlRenderer, sdlTexture, &sdlRect, &sdlRect ); 
 SDL_RenderCopy( sdlRenderer, sdlTexture, NULL, NULL); 
 SDL_RenderPresent( sdlRenderer ); 
 //SDL End-----------------------
 }
 }
 av_free_packet(packet);
 }else{
 //Exit Thread
 thread_exit=1;
 }
 }else if(event.type==SDL_QUIT){
 thread_exit=1;
 }else if(event.type==SFM_BREAK_EVENT){
 break;
 }
 }
 sws_freeContext(img_convert_ctx);
 SDL_Quit();
 //--------------
 av_frame_free(&pFrameYUV);
 av_frame_free(&pFrame);
 avcodec_close(pCodecCtx);
 avformat_close_input(&pFormatCtx);
 return 0;
}

这是安卓音视频学习系列笔记，笔记目录如下，欢迎移步到shennongblog.com查看更多内容！

Android 音视频学习基础--1.1 音视频基础知识
Android 音视频学习基础--1.2 需要认识的一些工具
Android 音视频学习基础--1.3 主流的开源项目
Android 音视频学习基础--1.4 ffmpeg pcm输出
Android 音视频学习基础--1.5 ffmpeg yuv输出
Android 音视频学习基础--1.6 ffmpeg 简单视频播放器
Android 音视频学习基础--1.7 Android最简单的音频播放器
Android 音视频学习基础--1.8 Android最简单的音频播放器
Android 音视频学习基础--1.9 Android最简单的视频播放器
Android 音视频学习基础--1.10 Android自制简单音视频播放