ffmpeg 0.6.3 能用的tutorial02

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totorial02需要安装sdl。用如下命令安装
sudo apt-get install libsdl1.2-dev
安装完后，编译totorial02.c的命令为：
gcc -o tutorial02 tutorial02.c -lavformat -lavcodec -lz -lm -lswscale `sdl-config --cflags --libs`

totorial02.c源程序如下：

// tutorial02.c
// A pedagogical video player that will stream through every video frame as fast as it can.
//
// Code based on FFplay, Copyright (c) 2003 Fabrice Bellard,
// and a tutorial by Martin Bohme (boehme@inb.uni-luebeckREMOVETHIS.de)
// Tested on Gentoo, CVS version 5/01/07 compiled with GCC 4.1.1
// Use
//
// gcc -o tutorial02 tutorial02.c -lavformat -lavcodec -lz -lm -lswscale `sdl-config --cflags --libs`
// to build (assuming libavformat and libavcodec are correctly installed,
// and assuming you have sdl-config. Please refer to SDL docs for your installation.)
//
// Run using
// tutorial02 myvideofile.mpg
//
// to play the video stream on your screen.

#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>

#include <SDL.h>
#include <SDL_thread.h>

#include <stdio.h>

int main(int argc, char *argv[]) {
    AVFormatContext *pFormatCtx;
    int     i, videoStream;
    AVCodecContext *pCodecCtx;
    AVCodec     *pCodec;
    AVFrame     *pFrame;
    AVPacket    packet;
    int     frameFinished;
    float       aspect_ratio;
    struct SwsContext *img_convert_ctx;

    SDL_Overlay *bmp;
    SDL_Surface *screen;
    SDL_Rect    rect;
    SDL_Event   event;

    if (argc < 2) {
        fprintf(stderr, "Usage: test <file>\n");
        exit(1);
    }

    av_register_all();

    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
        fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
        exit(1);
    }

    if (av_open_input_file(&pFormatCtx, argv[1], NULL, 0, NULL) != 0) {
        return -1;
    }

    if (av_find_stream_info(pFormatCtx) < 0) {
        return -1;
    }

    dump_format(pFormatCtx, 0, argv[1], 0);

    videoStream = -1;
    for (i=0 ; i<pFormatCtx->nb_streams ; i++) {
        if (pFormatCtx->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO) {
            videoStream = i;
            break;
        }
    }
    if (videoStream == -1) {
        return -1;
    }

    pCodecCtx = pFormatCtx->streams[videoStream]->codec;
    img_convert_ctx = sws_getContext(
            pCodecCtx->width,
            pCodecCtx->height,
            pCodecCtx->pix_fmt,
            pCodecCtx->width,
            pCodecCtx->height,
            PIX_FMT_YUV420P,
            //PIX_FMT_RGB24,
            SWS_BICUBIC,
            NULL, NULL, NULL);


    pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
    if (pCodec == NULL) {
        fprintf(stderr, "Unsupportd codec!\n");
        return -1;
    }

    if (avcodec_open(pCodecCtx, pCodec) < 0) {
        return -1;
    }

    pFrame = avcodec_alloc_frame();

    screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 24, 0);

    if (!screen) {
        fprintf(stderr, "SDL: could not set video mode - exiting\n");
        exit(1);
    }

    bmp = SDL_CreateYUVOverlay(pCodecCtx->width,
                       pCodecCtx->height,
                   SDL_YV12_OVERLAY,
                   screen);
    while(av_read_frame(pFormatCtx, &packet) >= 0) {
        if (packet.stream_index == videoStream) {
            avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,
                         packet.data, packet.size);

            if (frameFinished) {
                SDL_LockYUVOverlay(bmp);

                AVPicture pict;
                pict.data[0] = bmp->pixels[0];
                pict.data[1] = bmp->pixels[2];
                pict.data[2] = bmp->pixels[1];

                pict.linesize[0] = bmp->pitches[0];
                pict.linesize[1] = bmp->pitches[2];
                pict.linesize[2] = bmp->pitches[1];

                //img_convert(&pict, PIX_FMT_YUV420P,
                //      (AVPicture*)pFrame, pCodecCtx->pix_fmt,
                //      pCodecCtx->width, pCodecCtx->height);
                sws_scale(img_convert_ctx,
                      pFrame->data,
                      //(const uint8_t **)pFrame->data,
                      pFrame->linesize, 0,
                      pCodecCtx->height,
                      pict.data,
                      pict.linesize);

                SDL_UnlockYUVOverlay(bmp);

                rect.x = 0;
                rect.y = 0;
                rect.w = pCodecCtx->width;
                rect.h = pCodecCtx->height;
                SDL_DisplayYUVOverlay(bmp, &rect);
            }
        }

        av_free_packet(&packet);
        SDL_PollEvent(&event);
        switch(event.type) {
            case SDL_QUIT:
                SDL_Quit();
                exit(0);
                break;
            default:
                break;
        }
        SDL_Delay(100);
    }

    av_free(pFrame);

    avcodec_close(pCodecCtx);

    av_close_input_file(pFormatCtx);

    return 0;
}