📄 layeriidecoder.java
字号:
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2.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, 0.0f, -8.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, 0.0f, -6.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, 0.0f, -4.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, 0.0f, -2.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, 0.0f, 8.0f/9.0f, -6.0f/9.0f, 0.0f, 8.0f/9.0f, -4.0f/9.0f, 0.0f, 8.0f/9.0f, -2.0f/9.0f, 0.0f, 8.0f/9.0f, 0.0f, 0.0f, 8.0f/9.0f, 2.0f/9.0f, 0.0f, 8.0f/9.0f, 4.0f/9.0f, 0.0f, 8.0f/9.0f, 6.0f/9.0f, 0.0f, 8.0f/9.0f, 8.0f/9.0f, 0.0f, 8.0f/9.0f, -8.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, 0.0f, 2.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, 0.0f, 4.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 0.0f, 6.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 0.0f, 8.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f }; // data taken from ISO/IEC DIS 11172, Annexes 3-B.2[abcd] and 3-B.4: // subbands 0-2 in tables 3-B.2a and 2b: (index is allocation) public static final int table_ab1_codelength[] = // bits per codeword { 0, 5, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; public static final float table_ab1_groupingtables[][] = // pointer to sample grouping table, or NULL-pointer if ungrouped { null, grouping_5bits, null, null, null, null, null, null, null, null, null, null, null, null, null, null }; public static final float table_ab1_factor[] = // factor for requantization: (real)sample * factor - 1.0 gives requantized sample { 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/16.0f, 1.0f/32.0f, 1.0f/64.0f, 1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f, 1.0f/1024.0f, 1.0f/2048.0f, 1.0f/4096.0f, 1.0f/8192.0f, 1.0f/16384.0f, 1.0f/32768.0f }; public static final float table_ab1_c[] = // factor c for requantization from table 3-B.4 { 0.0f, 1.33333333333f, 1.14285714286f, 1.06666666666f, 1.03225806452f, 1.01587301587f, 1.00787401575f, 1.00392156863f, 1.00195694716f, 1.00097751711f, 1.00048851979f, 1.00024420024f, 1.00012208522f, 1.00006103888f, 1.00003051851f, 1.00001525902f }; public static final float table_ab1_d[] = // addend d for requantization from table 3-B.4 { 0.0f, 0.50000000000f, 0.25000000000f, 0.12500000000f, 0.06250000000f, 0.03125000000f, 0.01562500000f, 0.00781250000f, 0.00390625000f, 0.00195312500f, 0.00097656250f, 0.00048828125f, 0.00024414063f, 0.00012207031f, 0.00006103516f, 0.00003051758f }; // subbands 3-... tables 3-B.2a and 2b:
public static final float[] table_ab234_groupingtables[] = { null, grouping_5bits, grouping_7bits, null, grouping_10bits, null, null, null, null, null, null, null, null, null, null, null }; // subbands 3-10 in tables 3-B.2a and 2b: public static final int table_ab2_codelength[] = { 0, 5, 7, 3, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16 }; public static final float table_ab2_factor[] = { 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/8.0f, 1.0f/16.0f, 1.0f/32.0f, 1.0f/64.0f, 1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f, 1.0f/1024.0f, 1.0f/2048.0f, 1.0f/4096.0f, 1.0f/32768.0f }; public static final float table_ab2_c[] = { 0.0f, 1.33333333333f, 1.60000000000f, 1.14285714286f, 1.77777777777f, 1.06666666666f, 1.03225806452f, 1.01587301587f, 1.00787401575f, 1.00392156863f, 1.00195694716f, 1.00097751711f, 1.00048851979f, 1.00024420024f, 1.00012208522f, 1.00001525902f }; public static final float table_ab2_d[] = { 0.0f, 0.50000000000f, 0.50000000000f, 0.25000000000f, 0.50000000000f, 0.12500000000f, 0.06250000000f, 0.03125000000f, 0.01562500000f, 0.00781250000f, 0.00390625000f, 0.00195312500f, 0.00097656250f, 0.00048828125f, 0.00024414063f, 0.00003051758f }; // subbands 11-22 in tables 3-B.2a and 2b: public static final int table_ab3_codelength[] = { 0, 5, 7, 3, 10, 4, 5, 16 }; public static final float table_ab3_factor[] = { 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/8.0f, 1.0f/16.0f, 1.0f/32768.0f }; public static final float table_ab3_c[] = { 0.0f, 1.33333333333f, 1.60000000000f, 1.14285714286f, 1.77777777777f, 1.06666666666f, 1.03225806452f, 1.00001525902f }; public static final float table_ab3_d[] = { 0.0f, 0.50000000000f, 0.50000000000f, 0.25000000000f, 0.50000000000f, 0.12500000000f, 0.06250000000f, 0.00003051758f }; // subbands 23-... in tables 3-B.2a and 2b: public static final int table_ab4_codelength[] = { 0, 5, 7, 16 }; public static final float table_ab4_factor[] = { 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/32768.0f }; public static final float table_ab4_c[] = { 0.0f, 1.33333333333f, 1.60000000000f, 1.00001525902f }; public static final float table_ab4_d[] = { 0.0f, 0.50000000000f, 0.50000000000f, 0.00003051758f }; // subbands in tables 3-B.2c and 2d: public static final int table_cd_codelength[] = { 0, 5, 7, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }; public static final float table_cd_groupingtables[][] = { null, grouping_5bits, grouping_7bits, grouping_10bits, null, null, null, null, null, null, null, null, null, null, null, null }; public static final float table_cd_factor[] = { 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/8.0f, 1.0f/16.0f, 1.0f/32.0f, 1.0f/64.0f, 1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f, 1.0f/1024.0f, 1.0f/2048.0f, 1.0f/4096.0f, 1.0f/8192.0f, 1.0f/16384.0f }; public static final float table_cd_c[] = { 0.0f, 1.33333333333f, 1.60000000000f, 1.77777777777f, 1.06666666666f, 1.03225806452f, 1.01587301587f, 1.00787401575f, 1.00392156863f, 1.00195694716f, 1.00097751711f, 1.00048851979f, 1.00024420024f, 1.00012208522f, 1.00006103888f, 1.00003051851f }; public static final float table_cd_d[] = { 0.0f, 0.50000000000f, 0.50000000000f, 0.50000000000f, 0.12500000000f, 0.06250000000f, 0.03125000000f, 0.01562500000f, 0.00781250000f, 0.00390625000f, 0.00195312500f, 0.00097656250f, 0.00048828125f, 0.00024414063f, 0.00012207031f, 0.00006103516f }; protected int subbandnumber; protected int allocation; protected int scfsi; protected float scalefactor1, scalefactor2, scalefactor3; protected int[] codelength = {0}; protected float[][] groupingtable = {{0},{0}} ; protected float[] factor = {0.0f}; protected int groupnumber; protected int samplenumber; protected float[] samples = new float[3]; protected float[] c = {0}; protected float[] d = {0};
/** * Constructor */ public SubbandLayer2(int subbandnumber) { this.subbandnumber = subbandnumber; groupnumber = samplenumber = 0; }
/** * */ protected int get_allocationlength (Header header) { if (header.version() == Header.MPEG1) { int channel_bitrate = header.bitrate_index(); // calculate bitrate per channel: if (header.mode() != Header.SINGLE_CHANNEL) if (channel_bitrate == 4) channel_bitrate = 1; else channel_bitrate -= 4; if (channel_bitrate == 1 || channel_bitrate == 2) // table 3-B.2c or 3-B.2d if (subbandnumber <= 1) return 4; else⌨️ 快捷键说明
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