de.jarnbjo.theora.Header Maven / Gradle / Ivy

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package de.jarnbjo.theora;

import de.jarnbjo.util.io.BitInputStream;
import java.io.IOException;

public class Header {
    final private int[] version = new int[3];
    final private int width, height, fpsNumerator, fpsDenominator,
            aspectNumerator, aspectDenominator;
    final private int keyframeFrequencyForce, targetBitrate, quality;

    final private String versionString;

    private static final int[] HEADER
            = {0x80, 0x74, 0x68, 0x65, 0x6f, 0x72, 0x61};

    public Header(BitInputStream source) throws IOException {
        for (int i = 0; i < HEADER.length; i++) {
            if (source.getInt(8) != HEADER[i]) {
                throw new TheoraFormatException("Theora header mismatch.");
            }
        }

        version[0] = source.getInt(8);
        version[1] = source.getInt(8);
        version[2] = source.getInt(8);

        versionString = version[0] + "." + version[1] + "." + version[2];

        System.out.println("Version: " + versionString);

        if (version[0] != 3 && version[1] > 1) {
            throw new TheoraFormatException(
                    "Unsupported file format version: " + versionString);
        }

        width = source.getInt(16) << 4;
        height = source.getInt(16) << 4;

        System.out.println("width: " + width);
        System.out.println("height: " + height);

        fpsNumerator = source.getInt(32);
        fpsDenominator = source.getInt(32);

        System.out.println(fpsNumerator);
        System.out.println(fpsDenominator);

        aspectNumerator = source.getInt(24);
        aspectDenominator = source.getInt(24);

        System.out.println(aspectNumerator);
        System.out.println(aspectDenominator);

        keyframeFrequencyForce = 1 << source.getInt(5);
        targetBitrate = source.getSignedInt(24);
        quality = source.getSignedInt(6);

        System.out.println(keyframeFrequencyForce);
        System.out.println(targetBitrate);
        System.out.println(quality);
    }

    public int getWidth() {
        return width;
    }

    public int getHeight() {
        return height;
    }

    public double getFrameRate() {
        return fpsNumerator / (double) fpsDenominator;
    }

    public int getKeyframeFrequencyForce() {
        return keyframeFrequencyForce;
    }
}