Android 音视频学习基础--1.6 ffmpeg 简单视频

2018-11-21 本文已影响10人神农笔记
vs代码下载链接：
/**
 * 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;
}
Android 音视频学习基础--1.6 ffmpeg 简单视频

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