[FFmpeg-devel] i am going to resize one frame with sws_scale() function.

[KyungJoon]

Hello...

I hope to resize the frame with sws_scale() function.

but i did get green pixel data. i hope to show example source.

my written by belong source...

int nConvertWidth = 320;
 int nConvertHeight = 240;
 pInFileCtx = av_alloc_format_context();

 set_context_opts(pInFileCtx, avformat_opts, AV_OPT_FLAG_DECODING_PARAM);
 if (av_open_input_file(&pInFileCtx, pszFilePath, NULL, 0, NULL) < 0) return
-1;
 if( av_find_stream_info(pInFileCtx)<0 ) return -1;
 for (nLoopOne = 0; nLoopOne<pInFileCtx->nb_streams; nLoopOne++){
  if (pInFileCtx->streams[nLoopOne]->codec->codec_type == CODEC_TYPE_VIDEO){
   nVideoStreamIdx = nLoopOne;
   break;
  }
 }
 pVidCodecCtx = pInFileCtx->streams[nVideoStreamIdx]->codec;
 pVidCodec =
avcodec_find_decoder(pInFileCtx->streams[nVideoStreamIdx]->codec->codec_id);
 avcodec_open(pVidCodecCtx, pVidCodec);
 pFrameBuf = avcodec_alloc_frame();
 pRGBFrameBuf = avcodec_alloc_frame();
 nRGBFrameSize = avpicture_get_size(PIX_FMT_RGB24, pVidCodecCtx->width,
pVidCodecCtx->height);
 pRGBDataBuf = (uint8_t*)malloc(nRGBFrameSize);
 avpicture_fill((AVPicture *)pRGBFrameBuf, pRGBDataBuf, PIX_FMT_RGB24,
nConvertWidth, nConvertHeight);
 int nCntTemp = 0;
 int nRet;
 while (av_read_frame(pInFileCtx, &stPkt)>=0)
 {
  if (stPkt.stream_index == nVideoStreamIdx)
  {
   avcodec_decode_video(pVidCodecCtx, pFrameBuf, &nGotPicture, stPkt.data,
stPkt.size);

   if (nGotPicture)
   {
    static int sws_flags = SWS_BICUBIC;
    struct SwsContext *img_convert_ctx;
    img_convert_ctx = sws_getContext(pVidCodecCtx->width,
pVidCodecCtx->height, pVidCodecCtx->pix_fmt, nConvertWidth, nConvertHeight,
PIX_FMT_RGB24, sws_flags, NULL, NULL, NULL);
    nRet = sws_scale(img_convert_ctx, pFrameBuf->data, pFrameBuf->linesize,
0, pVidCodecCtx->height, pRGBFrameBuf->data, pRGBFrameBuf->linesize);
    //sws_freeContext(img_convert_ctx);
    ////img_convert((AVPicture*)pRGBFrameBuf, PIX_FMT_RGB24,
(AVPicture*)pYUVFrameBuf, PIX_FMT_YUV420P, nConvertWidth, nConvertHeight);
    if (nCntTemp++<5){
     ffmpeg_Util_SaveFrame(pRGBFrameBuf, nConvertWidth, nConvertHeight);
    }
    else
    {
     break;
    }
   }
  }
 }