/// <summary> Constructor. /// </summary> // REVIEW: these constructor arguments should be moved to the // decodeFrame() method, where possible, so that one public LayerIIIDecoder(Bitstream stream0, Header header0, SynthesisFilter filtera, SynthesisFilter filterb, Obuffer buffer0, int which_ch0) { InitBlock(); huffcodetab.inithuff(); is_1d = new int[SBLIMIT * SSLIMIT + 4]; ro = new float[2][][]; for (int i = 0; i < 2; i++) { ro[i] = new float[SBLIMIT][]; for (int i2 = 0; i2 < SBLIMIT; i2++) { ro[i][i2] = new float[SSLIMIT]; } } lr = new float[2][][]; for (int i3 = 0; i3 < 2; i3++) { lr[i3] = new float[SBLIMIT][]; for (int i4 = 0; i4 < SBLIMIT; i4++) { lr[i3][i4] = new float[SSLIMIT]; } } out_1d = new float[SBLIMIT * SSLIMIT]; prevblck = new float[2][]; for (int i5 = 0; i5 < 2; i5++) { prevblck[i5] = new float[SBLIMIT * SSLIMIT]; } k = new float[2][]; for (int i6 = 0; i6 < 2; i6++) { k[i6] = new float[SBLIMIT * SSLIMIT]; } nonzero = new int[2]; //III_scalefact_t III_scalefac_t = new temporaire2[2]; III_scalefac_t[0] = new temporaire2(); III_scalefac_t[1] = new temporaire2(); scalefac = III_scalefac_t; // L3TABLE INIT sfBandIndex = new SBI[9]; // SZD: MPEG2.5 +3 indices int[] l0 = new int[]{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576}; int[] s0 = new int[]{0, 4, 8, 12, 18, 24, 32, 42, 56, 74, 100, 132, 174, 192}; int[] l1 = new int[]{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 114, 136, 162, 194, 232, 278, 330, 394, 464, 540, 576}; int[] s1 = new int[]{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 136, 180, 192}; int[] l2 = new int[]{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576}; int[] s2 = new int[]{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192}; int[] l3 = new int[]{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 52, 62, 74, 90, 110, 134, 162, 196, 238, 288, 342, 418, 576}; int[] s3 = new int[]{0, 4, 8, 12, 16, 22, 30, 40, 52, 66, 84, 106, 136, 192}; int[] l4 = new int[]{0, 4, 8, 12, 16, 20, 24, 30, 36, 42, 50, 60, 72, 88, 106, 128, 156, 190, 230, 276, 330, 384, 576}; int[] s4 = new int[]{0, 4, 8, 12, 16, 22, 28, 38, 50, 64, 80, 100, 126, 192}; int[] l5 = new int[]{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 54, 66, 82, 102, 126, 156, 194, 240, 296, 364, 448, 550, 576}; int[] s5 = new int[]{0, 4, 8, 12, 16, 22, 30, 42, 58, 78, 104, 138, 180, 192}; // SZD: MPEG2.5 int[] l6 = new int[]{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576}; int[] s6 = new int[]{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192}; int[] l7 = new int[]{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576}; int[] s7 = new int[]{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192}; int[] l8 = new int[]{0, 12, 24, 36, 48, 60, 72, 88, 108, 132, 160, 192, 232, 280, 336, 400, 476, 566, 568, 570, 572, 574, 576}; int[] s8 = new int[]{0, 8, 16, 24, 36, 52, 72, 96, 124, 160, 162, 164, 166, 192}; sfBandIndex[0] = new SBI(l0, s0); sfBandIndex[1] = new SBI(l1, s1); sfBandIndex[2] = new SBI(l2, s2); sfBandIndex[3] = new SBI(l3, s3); sfBandIndex[4] = new SBI(l4, s4); sfBandIndex[5] = new SBI(l5, s5); //SZD: MPEG2.5 sfBandIndex[6] = new SBI(l6, s6); sfBandIndex[7] = new SBI(l7, s7); sfBandIndex[8] = new SBI(l8, s8); // END OF L3TABLE INIT if (reorder_table == null) { // SZD: generate LUT reorder_table = new int[9][]; for (int i = 0; i < 9; i++) reorder_table[i] = reorder(sfBandIndex[i].s); } // Sftable int[] ll0 = new int[]{0, 6, 11, 16, 21}; int[] ss0 = new int[]{0, 6, 12}; sftable = new Sftable(this, ll0, ss0); // END OF Sftable // scalefac_buffer scalefac_buffer = new int[54]; // END OF scalefac_buffer stream = stream0; header = header0; filter1 = filtera; filter2 = filterb; buffer = buffer0; which_channels = which_ch0; frame_start = 0; channels = (header.mode() == Header.SINGLE_CHANNEL)?1:2; max_gr = (header.version() == Header.MPEG1)?2:1; sfreq = header.sample_frequency() + ((header.version() == Header.MPEG1)?3:(header.version() == Header.MPEG25_LSF)?6:0); // SZD if (channels == 2) { switch (which_channels) { case (int)OutputChannelsEnum.LEFT_CHANNEL: case (int)OutputChannelsEnum.DOWNMIX_CHANNELS: first_channel = last_channel = 0; break; case (int)OutputChannelsEnum.RIGHT_CHANNEL: first_channel = last_channel = 1; break; case (int)OutputChannelsEnum.BOTH_CHANNELS: default: first_channel = 0; last_channel = 1; break; } } else { first_channel = last_channel = 0; } for (int ch = 0; ch < 2; ch++) for (int j = 0; j < 576; j++) prevblck[ch][j] = 0.0f; nonzero[0] = nonzero[1] = 576; br = new BitReserve(); si = new III_side_info_t(); }
/// <summary>* /// </summary> protected internal virtual 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 return 3; // tables 3-B.2a or 3-B.2b else if (subbandnumber <= 10) return 4; else if (subbandnumber <= 22) return 3; else return 2; } else { // MPEG-2 LSF -- Jeff // table B.1 of ISO/IEC 13818-3 if (subbandnumber <= 3) return 4; else if (subbandnumber <= 10) return 3; else return 2; } }