基于树莓派和max7219模块的LED矩阵钟表及闹铃设计源码

/* * 11/19/04 1.0 moved to LGPL. * * 18/06/01 Michael Scheerer, Fixed bugs which causes * negative indexes in method huffmann_decode and in method * dequanisize_sample. * * 16/07/01 Michael Scheerer, Catched a bug in method * huffmann_decode, which causes an outOfIndexException. * Cause : Indexnumber of 24 at SfBandIndex, * which has only a length of 22. I have simply and dirty * fixed the index to <= 22, because I'm not really be able * to fix the bug. The Indexnumber is taken from the MP3 * file and the origin Ma-Player with the same code works * well. * * 02/19/99 Java Conversion by E.B, javalayer@javazoom.net *----------------------------------------------------------------------- * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Library General Public License as published * by the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *---------------------------------------------------------------------- */ package de.quippy.mp3.decoder; /** * Class Implementing Layer 3 Decoder. * * @since 0.0 */ final class LayerIIIDecoder implements FrameDecoder { private static final double d43 = (4.0 / 3.0); public int[] scalefac_buffer; // MDM: removed, as this wasn't being used. // private float CheckSumOut1d = 0.0f; private int CheckSumHuff = 0; private int[] is_1d; private float[][][] ro; private float[][][] lr; private float[] out_1d; private float[][] prevblck; private float[][] k; private int[] nonzero; private Bitstream stream; private Header header; private SynthesisFilter filter1, filter2; private Obuffer buffer; private int which_channels; private BitReserve br; private III_side_info_t si; private temporaire2[] III_scalefac_t; private temporaire2[] scalefac; // private III_scalefac_t scalefac; private int max_gr; private int frame_start; private int part2_start; private int channels; private int first_channel; private int last_channel; private int sfreq; /** * Constructor. */ // 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) { huffcodetab.inithuff(); is_1d = new int[SBLIMIT * SSLIMIT + 4]; ro = new float[2][SBLIMIT][SSLIMIT]; lr = new float[2][SBLIMIT][SSLIMIT]; out_1d = new float[SBLIMIT * SSLIMIT]; prevblck = new float[2][SBLIMIT * SSLIMIT]; k = new float[2][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 = { 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 = { 0, 4, 8, 12, 18, 24, 32, 42, 56, 74, 100, 132, 174, 192 }; int[] l1 = { 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 = { 0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 136, 180, 192 }; int[] l2 = { 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 = { 0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192 }; int[] l3 = { 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 = { 0, 4, 8, 12, 16, 22, 30, 40, 52, 66, 84, 106, 136, 192 }; int[] l4 = { 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 = { 0, 4, 8, 12, 16, 22, 28, 38, 50, 64, 80, 100, 126, 192 }; int[] l5 = { 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 = { 0, 4, 8, 12, 16, 22, 30, 42, 58, 78, 104, 138, 180, 192 }; // SZD: MPEG2.5 int[] l6 = { 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 = { 0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192 }; int[] l7 = { 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 = { 0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192 }; int[] l8 = { 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 = { 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 // 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 = {0, 6, 11, 16, 21}; // int[] ss0 = {0, 6, 12}; // sftable = new Sftable(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 OutputChannels.LEFT_CHANNEL: case OutputChannels.DOWNMIX_CHANNELS: first_channel = last_channel = 0; break; case OutputChannels.RIGHT_CHANNEL: first_channel = last_channel = 1; break; case OutputChannels.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(); } /** * Notify decoder that a seek is being made. */ public void seek_notify() { frame_start = 0; for (int ch = 0; ch < 2; ch++) for (int j = 0; j < 576; j++) prevblck[ch][j] = 0.0f; br = new BitReserve(); } public void decodeFrame() { decode(); } /** * Decode one frame, filling the buffer with the output samples. */ // subband samples are buffered and passed to the // SynthesisFilter in one go. private float[] samples1 = new float[32]; private float[] samples2 = new float[32]; public void decode() { int nSlots = header.slots(); int flush_main; int gr, ch, ss, sb, sb18; int main_data_end; int bytes_to_discard; int i; get_side_info(); for (i = 0; i < nSlots; i++) br.hputbuf(stream.get_bits(8)); main_data_end = br.hsstell() >>> 3; // of previous frame if ((flush_main = (br.hsstell() & 7))