Пример #1
0
  public void stop() throws Exception {
    // Free the RGB image
    if (buffer != null) {
      av_free(buffer);
      buffer = null;
    }
    if (pFrameRGB != null) {
      av_free(pFrameRGB);
      pFrameRGB = null;
    }

    // Free the YUV frame
    if (pFrame != null) {
      av_free(pFrame);
      pFrame = null;
    }

    // Close the codec
    if (pCodecCtx != null) {
      avcodec_close(pCodecCtx);
      pCodecCtx = null;
    }

    // Close the video file
    if (pFormatCtx != null && !pFormatCtx.isNull()) {
      av_close_input_file(pFormatCtx);
      pFormatCtx = null;
    }

    if (return_image != null) {
      return_image.release();
      return_image = null;
    }
  }
Пример #2
0
 public void trigger() throws Exception {
   if (pFormatCtx == null || pFormatCtx.isNull()) {
     throw new Exception("Could not trigger: No AVFormatContext. (Has start() been called?)");
   }
   for (int i = 0; i < triggerFlushSize; i++) {
     if (av_read_frame(pFormatCtx, packet) < 0) {
       return;
     }
     av_free_packet(packet);
   }
 }
Пример #3
0
  public IplImage grab() throws Exception {
    if (pFormatCtx == null || pFormatCtx.isNull()) {
      throw new Exception("Could not grab: No AVFormatContext. (Has start() been called?)");
    }
    boolean done = false;
    long pts = 0;
    while (!done) {
      if (av_read_frame(pFormatCtx, packet) < 0) {
        // throw new Exception("Could not read frame");
        return null; // end of file?
      }

      // Is this a packet from the video stream?
      if (packet.stream_index() == videoStream) {
        // Decode video frame
        int len = avcodec_decode_video2(pCodecCtx, pFrame, frameFinished, packet);

        LongPointer opaque = new LongPointer(pFrame.opaque());
        if (packet.dts() != AV_NOPTS_VALUE) {
          pts = packet.dts();
        } else if (!opaque.isNull() && opaque.get() != AV_NOPTS_VALUE) {
          pts = opaque.get();
        } else {
          pts = 0;
        }
        AVRational time_base = pStream.time_base();
        pts = 1000 * pts * time_base.num() / time_base.den();

        // Did we get a video frame?
        if (len > 0 && frameFinished[0] != 0) {
          switch (colorMode) {
            case BGR:
            case GRAY:
              // Deinterlace Picture
              if (deinterlace) {
                avpicture_deinterlace(
                    pFrame, pFrame, pCodecCtx.pix_fmt(), pCodecCtx.width(), pCodecCtx.height());
              }

              // Convert the image from its native format to RGB
              sws_scale(
                  img_convert_ctx,
                  new PointerPointer(pFrame),
                  pFrame.linesize(),
                  0,
                  pCodecCtx.height(),
                  new PointerPointer(pFrameRGB),
                  pFrameRGB.linesize());
              return_image.imageData(buffer);
              return_image.widthStep(pFrameRGB.linesize(0));
              break;
            case RAW:
              assert (pCodecCtx.width() == return_image.width()
                  && pCodecCtx.height() == return_image.height());
              return_image.imageData(pFrame.data(0));
              return_image.widthStep(pFrame.linesize(0));
              break;
            default:
              assert (false);
          }
          return_image.imageSize(return_image.height() * return_image.widthStep());

          done = true;
        }
      }

      // Free the packet that was allocated by av_read_frame
      av_free_packet(packet);
    }

    return_image.timestamp = pts;
    return return_image;
  }