Discussion :

[asma.r]

salut
je veut faire un programme qui affiche un video dans une interface SDL j'ai eu ce programme de l'internet

Code :

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#include <ffmpeg/avcodec.h>
#include <ffmpeg/avformat.h>
 
#include <SDL.h>
#include <SDL_thread.h>
 
#ifdef __MINGW32__
#undef main /* Prevents SDL from overriding main() */
#endif
 
#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;
 
  SDL_Overlay     *bmp;
  SDL_Surface     *screen;
  SDL_Rect        rect;
  SDL_Event       event;
 
  if(argc < 2) {
    fprintf(stderr, "Usage: test <file>\n");
    exit(1);
  }
  // Register all formats and codecs
  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);
  }
 
  // Open video file
  if(av_open_input_file(&pFormatCtx, argv[1], NULL, 0, NULL)!=0)
    return -1; // Couldn't open file
 
  // Retrieve stream information
  if(av_find_stream_info(pFormatCtx)<0)
    return -1; // Couldn't find stream information
 
  // Dump information about file onto standard error
  dump_format(pFormatCtx, 0, argv[1], 0);
 
  // Find the first video stream
  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; // Didn't find a video stream
 
  // Get a pointer to the codec context for the video stream
  pCodecCtx=pFormatCtx->streams[videoStream]->codec;
 
  // Find the decoder for the video stream
  pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  if(pCodec==NULL) {
    fprintf(stderr, "Unsupported codec!\n");
    return -1; // Codec not found
  }
 
  // Open codec
  if(avcodec_open(pCodecCtx, pCodec)<0)
    return -1; // Could not open codec
 
  // Allocate video frame
  pFrame=avcodec_alloc_frame();
 
  // Make a screen to put our video
#ifndef __DARWIN__
        screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 0, 0);
#else
        screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 24, 0);
#endif
  if(!screen) {
    fprintf(stderr, "SDL: could not set video mode - exiting\n");
    exit(1);
  }
 
  // Allocate a place to put our YUV image on that screen
  bmp = SDL_CreateYUVOverlay(pCodecCtx->width,
				 pCodecCtx->height,
				 SDL_YV12_OVERLAY,
				 screen);
 
 
  // Read frames and save first five frames to disk
  i=0;
  while(av_read_frame(pFormatCtx, &packet)>=0) {
    // Is this a packet from the video stream?
    if(packet.stream_index==videoStream) {
      // Decode video frame
      avcodec_decode_video(pCodecCtx, pFrame, &frameFinished, 
			   packet.data, packet.size);
 
      // Did we get a video frame?
      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];
 
	// Convert the image into YUV format that SDL uses
	img_convert(&pict, PIX_FMT_YUV420P,
                    (AVPicture *)pFrame, pCodecCtx->pix_fmt, 
		    pCodecCtx->width, pCodecCtx->height);
 
	SDL_UnlockYUVOverlay(bmp);
 
	rect.x = 0;
	rect.y = 0;
	rect.w = pCodecCtx->width;
	rect.h = pCodecCtx->height;
	SDL_DisplayYUVOverlay(bmp, &rect);
 
      }
    }
 
    // Free the packet that was allocated by av_read_frame
    av_free_packet(&packet);
    SDL_PollEvent(&event);
    switch(event.type) {
    case SDL_QUIT:
      SDL_Quit();
      exit(0);
      break;
    default:
      break;
    }
 
  }
 
  // Free the YUV frame
  av_free(pFrame);
 
  // Close the codec
  avcodec_close(pCodecCtx);
 
  // Close the video file
  av_close_input_file(pFormatCtx);
 
  return 0;
}

mais lorsque je veut lire un fichier .mpg avec ce programme le fichier est accéléré quel est le probleme et comment reduire la vitesse de fichier
j'ai essayer de faire une boucle for dans while(av_read_frame(pFormatCtx, &packet)>=0) mais ça ne marche pas
merci d'avance

[hicham10]

http://www.dranger.com/ffmpeg/