C++ Stream::GetCodecContext方法代码示例

int main(int argc, char *argv[])
{
    // Parse the options

    int opt;
    while ((opt = getopt(argc, argv, "")) != -1)
    {
        switch (opt)
        {
        default:
            usage(argv[0]);
        }
    }

    if (argc < optind+2) usage(argv[0]);

    char* file_in = argv[optind];
    char* file_out = argv[argc-1];

    // Init all the crap

    av_register_all();

    // Open the input file and get the input format context

    InputFormatContext inFormatCtx(file_in);

    dump_format(inFormatCtx.get(), 0, file_in, 0); // Just for debugging

    // Find the input video stream

    Stream inStream = inFormatCtx.GetVideoStream();

    // Get the input codec context

    CodecContext inCodecCtx = inStream.GetCodecContext();

    // Allocate the output format context, guess the format, set no parameters

    OutputFormat outFormat;

    try {
        outFormat = OutputFormat(0, file_out);
    } catch(std::runtime_error e) {
        warn("Could not guess the format based on extension, trying the input format");
        outFormat = OutputFormat(inFormatCtx.GetFormat().GetName(), file_in);
    }

    OutputFormatContext outFormatCtx(file_out, outFormat);

    // Create the output video stream

    Stream outStream = outFormatCtx.AddVideoStream();

    outStream.SetFrameRate(inStream.GetFrameRate());
    outStream.SetAspectRatio(inStream.GetAspectRatio());

    // Set the output codec context

    CodecContext outCodecCtx = outStream.GetCodecContext();

    outCodecCtx.SetWidth(inCodecCtx.GetWidth());
    outCodecCtx.SetHeight(inCodecCtx.GetHeight());
    //outCodecCtx.SetBitrate(inCodecCtx.GetBitrate());

    outCodecCtx.get()->codec_id = inCodecCtx.get()->codec_id;
    //outCodecCtx.get()->codec_type = inCodecCtx.get()->codec_type;
    outCodecCtx.get()->codec_tag = inCodecCtx.get()->codec_tag;
    //outCodecCtx.get()->has_b_frames = inCodecCtx.get()->has_b_frames;
    //outCodecCtx.get()->bit_rate = inCodecCtx.get()->bit_rate;
    //outCodecCtx.get()->extradata = inCodecCtx.get()->extradata;
    //outCodecCtx.get()->extradata_size = inCodecCtx.get()->extradata_size;

    //if (codec) pOutCodec = avcodec_find_encoder_by_name(codec)->id;

    // Open the output file, write the header

    if (!(outFormatCtx.get()->oformat->flags & AVFMT_NOFILE))
    {
        if (url_fopen(&outFormatCtx.get()->pb, outFormatCtx.get()->filename, URL_WRONLY) < 0)
            fail("Could not open the output file");
    }

    // Parse the video

    if (outFormatCtx.get()->oformat->flags & AVFMT_RAWPICTURE) fail("Raw dump not supported yet");

    long long globaloffset = 0;

    while (optind < argc-1)
    {
        char* file_in = argv[optind];
        fprintf(stderr, "Appending%s\n", file_in);

        InputFormatContext inFormatCtx(file_in);
        Stream inStream = inFormatCtx.GetVideoStream();

        long long localoffset = -1;
        long long pts = 0; // Frame presentation number (Presentation Time Stamp)

//.........这里部分代码省略.........

int main(int argc, char *argv[])
{
   // Parse the options

   Timestamp frame_start;
   Timestamp frame_end;
   Timestamp frame_every;
   int width = 0;
   int height = 0;

   int opt;
   while ((opt = getopt(argc, argv, "s:e:t:x:y:")) != -1)
   {
      switch (opt)
      {
         case 's':
            frame_start = Timestamp(optarg);
            break;
         case 'e':
            frame_end = Timestamp(optarg);
            break;
         case 't':
            frame_every = Timestamp(optarg);
            break;
         case 'x':
            width = atoi(optarg);
            break;
         case 'y':
            height = atoi(optarg);
            break;
         default:
            usage(argv[0]);
      }
   }

   if (argc < optind+1) usage(argv[0]);
   if (  frame_end.set &&   frame_end.type != 'd' &&   frame_end.type != 'p' &&   frame_end.type != 's') usage(argv[0]);
   if (frame_start.set && frame_start.type != 'd' && frame_start.type != 'p' && frame_start.type != 's') usage(argv[0]);
   if (frame_every.set && frame_every.type != 'd' && frame_every.type != 'p' && frame_every.type != 's') usage(argv[0]);

   char* file_in = argv[optind];

   // Init all the crap

   av_register_all();

   
   // Open the input file and get the input format context

   InputFormatContext inFormatCtx(file_in);
   
   dump_format(inFormatCtx.get(), 0, file_in, 0); // Just for debugging

   // Find the input video stream

   Stream inStream = inFormatCtx.GetVideoStream();
   
   // Get the input codec context

   CodecContext inCodecCtx = inStream.GetCodecContext();

   if (width == 0 && height == 0) // Same width and height by default
   {
      width = inCodecCtx.GetWidth();
      height = inCodecCtx.GetHeight();
   } else { // Try to keep the aspect ratio
      if (width == 0) width = (int)((float)inCodecCtx.GetWidth() * height/inCodecCtx.GetHeight());
      else if (height == 0) height = (int)((float)inCodecCtx.GetHeight() * width/inCodecCtx.GetWidth());
   }
   
   // Set the resampling context
   
   ScalerContext* pScalerCtx = 0;
   if (inCodecCtx.GetPixelFormat() >= 0)
	pScalerCtx = new ScalerContext(inCodecCtx, width, height, PIX_FMT_GRAY8);

   // Set detector/descriptor stuff

   Image img(width, height);
   lava_ns::ImagePyramid<Image> pyramid;
   pyramid.setScaleFactor(1.2);
   lava_ns::SIFT<Image> descriptor;
   descriptor.setImagePyramid(&pyramid);
   descriptor.setMainParam(61,12,4,8);
   FramePointReceiver receiver(width, height, av_q2d(inStream.GetTimeBase()), descriptor);
   lava_ns::HarrisLaplace<Image> detector;
   detector.setPosThreshold(300);
   detector.setReceiver(&receiver);
   detector.setImage(&pyramid);
   
   // Parse the video

   if (frame_start.set)
   {
	  if (frame_start.type == 's') inFormatCtx.Seek(frame_start.value);
	  if (frame_start.type == 'p') inFormatCtx.Seek(inStream, frame_start.value);	  
   }

   int haveoutput = 0;

//.........这里部分代码省略.........