Class QuantizePVT

src/main/java/mp3/QuantizePVT.java:30–1009

public class QuantizePVT {
	
	Takehiro tak;
	Reservoir rv;
	PsyModel psy;

	public final void setModules(Takehiro tk, Reservoir rv, PsyModel psy) {
		this.tak = tk;
		this.rv = rv;
		this.psy = psy;
	}

	public final float POW20(final int x) {
		assert (0 <= (x + QuantizePVT.Q_MAX2) && x < QuantizePVT.Q_MAX);
		return pow20[x + QuantizePVT.Q_MAX2];
	}

	public final float IPOW20(final int x) {
		assert (0 <= x && x < QuantizePVT.Q_MAX);
		return ipow20[x];
	}

	/**
	 * smallest such that 1.0+DBL_EPSILON != 1.0
	 */
	private static final float DBL_EPSILON = 2.2204460492503131e-016f;

	/**
	 * ix always <= 8191+15. see count_bits()
	 */
	public static final int IXMAX_VAL = 8206;

	private static final int PRECALC_SIZE = (IXMAX_VAL + 2);

	private static final int Q_MAX =(256+1);

	/**
	 * <CODE>
	 * minimum possible number of
	 * -cod_info.global_gain + ((scalefac[] + (cod_info.preflag ? pretab[sfb] : 0))
	 * << (cod_info.scalefac_scale + 1)) + cod_info.subblock_gain[cod_info.window[sfb]] * 8;
	 * 
	 * for long block, 0+((15+3)<<2) = 18*4 = 72
	 * for short block, 0+(15<<2)+7*8 = 15*4+56 = 116
	 * </CODE>
	 */
	public static final int Q_MAX2 = 116;

	public static final int LARGE_BITS =100000;

	/**
	 * Assuming dynamic range=96dB, this value should be 92
	 */
	private static final int NSATHSCALE = 100;

	/**
	 * The following table is used to implement the scalefactor partitioning for
	 * MPEG2 as described in section 2.4.3.2 of the IS. The indexing corresponds