diff options
Diffstat (limited to 'songdbj/javazoom/jl/decoder/LayerIIDecoder.java')
-rw-r--r-- | songdbj/javazoom/jl/decoder/LayerIIDecoder.java | 1064 |
1 files changed, 0 insertions, 1064 deletions
diff --git a/songdbj/javazoom/jl/decoder/LayerIIDecoder.java b/songdbj/javazoom/jl/decoder/LayerIIDecoder.java deleted file mode 100644 index 7265b1f8fa..0000000000 --- a/songdbj/javazoom/jl/decoder/LayerIIDecoder.java +++ /dev/null @@ -1,1064 +0,0 @@ -/* - * 11/19/04 1.0 moved to LGPL. - * - * 29/05/01 Michael Scheerer, Fixed some C++ to Java porting bugs. - * - * 16/07/01 Michael Scheerer, Catched a bug in method - * read_sampledata, which causes an outOfIndexException. - * - * 12/12/99 Initial version. Adapted from javalayer.java - * and Subband*.java. mdm@techie.com - * - * 02/28/99 Initial version : javalayer.java by E.B - *----------------------------------------------------------------------- - * 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 javazoom.jl.decoder; - -/** - * Implements decoding of MPEG Audio Layer II frames. - */ -class LayerIIDecoder extends LayerIDecoder implements FrameDecoder -{ - - public LayerIIDecoder() - { - } - - - protected void createSubbands() - { - int i; - if (mode == Header.SINGLE_CHANNEL) - for (i = 0; i < num_subbands; ++i) - subbands[i] = new SubbandLayer2(i); - else if (mode == Header.JOINT_STEREO) - { - for (i = 0; i < header.intensity_stereo_bound(); ++i) - subbands[i] = new SubbandLayer2Stereo(i); - for (; i < num_subbands; ++i) - subbands[i] = new SubbandLayer2IntensityStereo(i); - } - else - { - for (i = 0; i < num_subbands; ++i) - subbands[i] = new SubbandLayer2Stereo(i); - } - - } - - protected void readScaleFactorSelection() - { - for (int i = 0; i < num_subbands; ++i) - ((SubbandLayer2)subbands[i]).read_scalefactor_selection(stream, crc); - } - - - - /** - * Class for layer II subbands in single channel mode. - */ - static class SubbandLayer2 extends Subband - { - // this table contains 3 requantized samples for each legal codeword - // when grouped in 5 bits, i.e. 3 quantizationsteps per sample - public static final float grouping_5bits[] = new float[] - { - -2.0f/3.0f, -2.0f/3.0f, -2.0f/3.0f, - 0.0f, -2.0f/3.0f, -2.0f/3.0f, - 2.0f/3.0f, -2.0f/3.0f, -2.0f/3.0f, - -2.0f/3.0f, 0.0f, -2.0f/3.0f, - 0.0f, 0.0f, -2.0f/3.0f, - 2.0f/3.0f, 0.0f, -2.0f/3.0f, - -2.0f/3.0f, 2.0f/3.0f, -2.0f/3.0f, - 0.0f, 2.0f/3.0f, -2.0f/3.0f, - 2.0f/3.0f, 2.0f/3.0f, -2.0f/3.0f, - -2.0f/3.0f, -2.0f/3.0f, 0.0f, - 0.0f, -2.0f/3.0f, 0.0f, - 2.0f/3.0f, -2.0f/3.0f, 0.0f, - -2.0f/3.0f, 0.0f, 0.0f, - 0.0f, 0.0f, 0.0f, - 2.0f/3.0f, 0.0f, 0.0f, - -2.0f/3.0f, 2.0f/3.0f, 0.0f, - 0.0f, 2.0f/3.0f, 0.0f, - 2.0f/3.0f, 2.0f/3.0f, 0.0f, - -2.0f/3.0f, -2.0f/3.0f, 2.0f/3.0f, - 0.0f, -2.0f/3.0f, 2.0f/3.0f, - 2.0f/3.0f, -2.0f/3.0f, 2.0f/3.0f, - -2.0f/3.0f, 0.0f, 2.0f/3.0f, - 0.0f, 0.0f, 2.0f/3.0f, - 2.0f/3.0f, 0.0f, 2.0f/3.0f, - -2.0f/3.0f, 2.0f/3.0f, 2.0f/3.0f, - 0.0f, 2.0f/3.0f, 2.0f/3.0f, - 2.0f/3.0f, 2.0f/3.0f, 2.0f/3.0f - }; - - // this table contains 3 requantized samples for each legal codeword - // when grouped in 7 bits, i.e. 5 quantizationsteps per sample - public static final float grouping_7bits[] = new float[] - { - -0.8f, -0.8f, -0.8f, -0.4f, -0.8f, -0.8f, 0.0f, -0.8f, -0.8f, 0.4f, -0.8f, -0.8f, 0.8f, -0.8f, -0.8f, - -0.8f, -0.4f, -0.8f, -0.4f, -0.4f, -0.8f, 0.0f, -0.4f, -0.8f, 0.4f, -0.4f, -0.8f, 0.8f, -0.4f, -0.8f, - -0.8f, 0.0f, -0.8f, -0.4f, 0.0f, -0.8f, 0.0f, 0.0f, -0.8f, 0.4f, 0.0f, -0.8f, 0.8f, 0.0f, -0.8f, - -0.8f, 0.4f, -0.8f, -0.4f, 0.4f, -0.8f, 0.0f, 0.4f, -0.8f, 0.4f, 0.4f, -0.8f, 0.8f, 0.4f, -0.8f, - -0.8f, 0.8f, -0.8f, -0.4f, 0.8f, -0.8f, 0.0f, 0.8f, -0.8f, 0.4f, 0.8f, -0.8f, 0.8f, 0.8f, -0.8f, - -0.8f, -0.8f, -0.4f, -0.4f, -0.8f, -0.4f, 0.0f, -0.8f, -0.4f, 0.4f, -0.8f, -0.4f, 0.8f, -0.8f, -0.4f, - -0.8f, -0.4f, -0.4f, -0.4f, -0.4f, -0.4f, 0.0f, -0.4f, -0.4f, 0.4f, -0.4f, -0.4f, 0.8f, -0.4f, -0.4f, - -0.8f, 0.0f, -0.4f, -0.4f, 0.0f, -0.4f, 0.0f, 0.0f, -0.4f, 0.4f, 0.0f, -0.4f, 0.8f, 0.0f, -0.4f, - -0.8f, 0.4f, -0.4f, -0.4f, 0.4f, -0.4f, 0.0f, 0.4f, -0.4f, 0.4f, 0.4f, -0.4f, 0.8f, 0.4f, -0.4f, - -0.8f, 0.8f, -0.4f, -0.4f, 0.8f, -0.4f, 0.0f, 0.8f, -0.4f, 0.4f, 0.8f, -0.4f, 0.8f, 0.8f, -0.4f, - -0.8f, -0.8f, 0.0f, -0.4f, -0.8f, 0.0f, 0.0f, -0.8f, 0.0f, 0.4f, -0.8f, 0.0f, 0.8f, -0.8f, 0.0f, - -0.8f, -0.4f, 0.0f, -0.4f, -0.4f, 0.0f, 0.0f, -0.4f, 0.0f, 0.4f, -0.4f, 0.0f, 0.8f, -0.4f, 0.0f, - -0.8f, 0.0f, 0.0f, -0.4f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.4f, 0.0f, 0.0f, 0.8f, 0.0f, 0.0f, - -0.8f, 0.4f, 0.0f, -0.4f, 0.4f, 0.0f, 0.0f, 0.4f, 0.0f, 0.4f, 0.4f, 0.0f, 0.8f, 0.4f, 0.0f, - -0.8f, 0.8f, 0.0f, -0.4f, 0.8f, 0.0f, 0.0f, 0.8f, 0.0f, 0.4f, 0.8f, 0.0f, 0.8f, 0.8f, 0.0f, - -0.8f, -0.8f, 0.4f, -0.4f, -0.8f, 0.4f, 0.0f, -0.8f, 0.4f, 0.4f, -0.8f, 0.4f, 0.8f, -0.8f, 0.4f, - -0.8f, -0.4f, 0.4f, -0.4f, -0.4f, 0.4f, 0.0f, -0.4f, 0.4f, 0.4f, -0.4f, 0.4f, 0.8f, -0.4f, 0.4f, - -0.8f, 0.0f, 0.4f, -0.4f, 0.0f, 0.4f, 0.0f, 0.0f, 0.4f, 0.4f, 0.0f, 0.4f, 0.8f, 0.0f, 0.4f, - -0.8f, 0.4f, 0.4f, -0.4f, 0.4f, 0.4f, 0.0f, 0.4f, 0.4f, 0.4f, 0.4f, 0.4f, 0.8f, 0.4f, 0.4f, - -0.8f, 0.8f, 0.4f, -0.4f, 0.8f, 0.4f, 0.0f, 0.8f, 0.4f, 0.4f, 0.8f, 0.4f, 0.8f, 0.8f, 0.4f, - -0.8f, -0.8f, 0.8f, -0.4f, -0.8f, 0.8f, 0.0f, -0.8f, 0.8f, 0.4f, -0.8f, 0.8f, 0.8f, -0.8f, 0.8f, - -0.8f, -0.4f, 0.8f, -0.4f, -0.4f, 0.8f, 0.0f, -0.4f, 0.8f, 0.4f, -0.4f, 0.8f, 0.8f, -0.4f, 0.8f, - -0.8f, 0.0f, 0.8f, -0.4f, 0.0f, 0.8f, 0.0f, 0.0f, 0.8f, 0.4f, 0.0f, 0.8f, 0.8f, 0.0f, 0.8f, - -0.8f, 0.4f, 0.8f, -0.4f, 0.4f, 0.8f, 0.0f, 0.4f, 0.8f, 0.4f, 0.4f, 0.8f, 0.8f, 0.4f, 0.8f, - -0.8f, 0.8f, 0.8f, -0.4f, 0.8f, 0.8f, 0.0f, 0.8f, 0.8f, 0.4f, 0.8f, 0.8f, 0.8f, 0.8f, 0.8f - }; - - // this table contains 3 requantized samples for each legal codeword - // when grouped in 10 bits, i.e. 9 quantizationsteps per sample - public static final float grouping_10bits[] = - { - -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, - 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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[][] = new float[2][]; - //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 - return 3; - else - // tables 3-B.2a or 3-B.2b - 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; - } - } - - /** - * - */ - protected void prepare_sample_reading(Header header, int allocation, - //float[][] groupingtable, - int channel, - float[] factor, int[] codelength, - float[] c, float[] d) - { - 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 - groupingtable[channel] = table_cd_groupingtables[allocation]; - factor[0] = table_cd_factor[allocation]; - codelength[0] = table_cd_codelength[allocation]; - c[0] = table_cd_c[allocation]; - d[0] = table_cd_d[allocation]; - } - else - { - // tables 3-B.2a or 3-B.2b - if (subbandnumber <= 2) - { - groupingtable[channel] = table_ab1_groupingtables[allocation]; - factor[0] = table_ab1_factor[allocation]; - codelength[0] = table_ab1_codelength[allocation]; - c[0] = table_ab1_c[allocation]; - d[0] = table_ab1_d[allocation]; - } - else - { - groupingtable[channel] = table_ab234_groupingtables[allocation]; - if (subbandnumber <= 10) - { - factor[0] = table_ab2_factor[allocation]; - codelength[0] = table_ab2_codelength[allocation]; - c[0] = table_ab2_c[allocation]; - d[0] = table_ab2_d[allocation]; - } - else if (subbandnumber <= 22) - { - factor[0] = table_ab3_factor[allocation]; - codelength[0] = table_ab3_codelength[allocation]; - c[0] = table_ab3_c[allocation]; - d[0] = table_ab3_d[allocation]; - } - else - { - factor[0] = table_ab4_factor[allocation]; - codelength[0] = table_ab4_codelength[allocation]; - c[0] = table_ab4_c[allocation]; - d[0] = table_ab4_d[allocation]; - } - } - } - } - - - /** - * - */ - public void read_allocation(Bitstream stream, Header header, Crc16 crc) - { - int length = get_allocationlength(header); - allocation = stream.get_bits(length); - if (crc != null) - crc.add_bits(allocation, length); - } - - /** - * - */ - public void read_scalefactor_selection (Bitstream stream, Crc16 crc) - { - if (allocation != 0) - { - scfsi = stream.get_bits(2); - if (crc != null) crc.add_bits(scfsi, 2); - } - } - - /** - * - */ - public void read_scalefactor (Bitstream stream, Header header) - { - if (allocation != 0) - { - switch (scfsi) - { - case 0: - scalefactor1 = scalefactors[stream.get_bits(6)]; - scalefactor2 = scalefactors[stream.get_bits(6)]; - scalefactor3 = scalefactors[stream.get_bits(6)]; - break; - case 1: - scalefactor1 = scalefactor2 = scalefactors[stream.get_bits(6)]; - scalefactor3 = scalefactors[stream.get_bits(6)]; - break; - case 2: - scalefactor1 = scalefactor2 = scalefactor3 = scalefactors[stream.get_bits(6)]; - break; - case 3: - scalefactor1 = scalefactors[stream.get_bits(6)]; - scalefactor2 = scalefactor3 = scalefactors[stream.get_bits(6)]; - break; - } - prepare_sample_reading(header, allocation, 0, - factor, codelength, c, d); - } - } - - /** - * - */ - public boolean read_sampledata (Bitstream stream) - { - if (allocation != 0) - if (groupingtable[0] != null) - { - int samplecode = stream.get_bits(codelength[0]); - // create requantized samples: - samplecode += samplecode << 1; - float[] target = samples; - float[] source = groupingtable[0]; - /* - int tmp = 0; - int temp = 0; - target[tmp++] = source[samplecode + temp]; - temp++; - target[tmp++] = source[samplecode + temp]; - temp++; - target[tmp] = source[samplecode + temp]; - */ - //Bugfix: - int tmp = 0; - int temp = samplecode; - - if(temp > source.length - 3) temp = source.length - 3; - - target[tmp] = source[temp]; - temp++;tmp++; - target[tmp] = source[temp]; - temp++;tmp++; - target[tmp] = source[temp]; - - // memcpy (samples, groupingtable + samplecode, 3 * sizeof (real)); - } - else - { - samples[0] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0); - samples[1] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0); - samples[2] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0); - } - - samplenumber = 0; - if (++groupnumber == 12) - return true; - else - return false; - } - - /** - * - */ - public boolean put_next_sample(int channels, SynthesisFilter filter1, SynthesisFilter filter2) - { - if ((allocation != 0) && (channels != OutputChannels.RIGHT_CHANNEL)) - { - float sample = samples[samplenumber]; - - if (groupingtable[0] == null) - sample = (sample + d[0]) * c[0]; - if (groupnumber <= 4) - sample *= scalefactor1; - else if (groupnumber <= 8) - sample *= scalefactor2; - else - sample *= scalefactor3; - filter1.input_sample(sample, subbandnumber); - } - - if (++samplenumber == 3) - return true; - else - return false; - } - }; - - /** - * Class for layer II subbands in joint stereo mode. - */ - static class SubbandLayer2IntensityStereo extends SubbandLayer2 - { - protected int channel2_scfsi; - protected float channel2_scalefactor1, channel2_scalefactor2, channel2_scalefactor3; - - /** - * Constructor - */ - public SubbandLayer2IntensityStereo (int subbandnumber) - { - super(subbandnumber); - } - - /** - * - */ - public void read_allocation(Bitstream stream, Header header, Crc16 crc) - { - super.read_allocation (stream, header, crc); - } - - /** - * - */ - public void read_scalefactor_selection(Bitstream stream, Crc16 crc) - { - if (allocation != 0) - { - scfsi = stream.get_bits(2); - channel2_scfsi = stream.get_bits(2); - if (crc != null) - { - crc.add_bits(scfsi, 2); - crc.add_bits(channel2_scfsi, 2); - } - } - } - - /** - * - */ - public void read_scalefactor(Bitstream stream, Header header) - { - if (allocation != 0) - { - super.read_scalefactor(stream, header); - switch (channel2_scfsi) - { - case 0: - channel2_scalefactor1 = scalefactors[stream.get_bits(6)]; - channel2_scalefactor2 = scalefactors[stream.get_bits(6)]; - channel2_scalefactor3 = scalefactors[stream.get_bits(6)]; - break; - - case 1: - channel2_scalefactor1 = channel2_scalefactor2 = scalefactors[stream.get_bits (6)]; - channel2_scalefactor3 = scalefactors[stream.get_bits(6)]; - break; - - case 2: - channel2_scalefactor1 = channel2_scalefactor2 = - channel2_scalefactor3 = scalefactors[stream.get_bits(6)]; - break; - - case 3: - channel2_scalefactor1 = scalefactors[stream.get_bits(6)]; - channel2_scalefactor2 = channel2_scalefactor3 = scalefactors[stream.get_bits (6)]; - break; - } - } - - } - - /** - * - */ - public boolean read_sampledata(Bitstream stream) - { - return super.read_sampledata (stream); - } - - /** - * - */ - public boolean put_next_sample(int channels, SynthesisFilter filter1, SynthesisFilter filter2) - { - if (allocation != 0) - { - float sample = samples[samplenumber]; - - if (groupingtable[0] == null) - sample = (sample + d[0]) * c[0]; - if (channels == OutputChannels.BOTH_CHANNELS) - { - float sample2 = sample; - if (groupnumber <= 4) - { - sample *= scalefactor1; - sample2 *= channel2_scalefactor1; - } - else if (groupnumber <= 8) - { - sample *= scalefactor2; - sample2 *= channel2_scalefactor2; - } - else - { - sample *= scalefactor3; - sample2 *= channel2_scalefactor3; - } - filter1.input_sample(sample, subbandnumber); - filter2.input_sample(sample2, subbandnumber); - } - else if (channels == OutputChannels.LEFT_CHANNEL) - { - if (groupnumber <= 4) - sample *= scalefactor1; - else if (groupnumber <= 8) - sample *= scalefactor2; - else - sample *= scalefactor3; - filter1.input_sample(sample, subbandnumber); - } - else - { - if (groupnumber <= 4) - sample *= channel2_scalefactor1; - else if (groupnumber <= 8) - sample *= channel2_scalefactor2; - else - sample *= channel2_scalefactor3; - filter1.input_sample(sample, subbandnumber); - } - } - - if (++samplenumber == 3) - return true; - else - return false; - } - }; - - /** - * Class for layer II subbands in stereo mode. - */ - static class SubbandLayer2Stereo extends SubbandLayer2 - { - protected int channel2_allocation; - protected int channel2_scfsi; - protected float channel2_scalefactor1, channel2_scalefactor2, channel2_scalefactor3; - //protected boolean channel2_grouping; ???? Never used! - protected int[] channel2_codelength = {0}; - //protected float[][] channel2_groupingtable = {{0},{0}}; - protected float[] channel2_factor = {0}; - protected float[] channel2_samples; - protected float[] channel2_c = {0}; - protected float[] channel2_d = {0}; - - /** - * Constructor - */ - public SubbandLayer2Stereo(int subbandnumber) - { - super(subbandnumber); - channel2_samples = new float[3]; - } - - /** - * - */ - public void read_allocation (Bitstream stream, Header header, Crc16 crc) - { - int length = get_allocationlength(header); - allocation = stream.get_bits(length); - channel2_allocation = stream.get_bits(length); - if (crc != null) - { - crc.add_bits(allocation, length); - crc.add_bits(channel2_allocation, length); - } - } - - /** - * - */ - public void read_scalefactor_selection(Bitstream stream, Crc16 crc) - { - if (allocation != 0) - { - scfsi = stream.get_bits(2); - if (crc != null) - crc.add_bits(scfsi, 2); - } - if (channel2_allocation != 0) - { - channel2_scfsi = stream.get_bits(2); - if (crc != null) - crc.add_bits(channel2_scfsi, 2); - } - } - - /** - * - */ - public void read_scalefactor(Bitstream stream, Header header) - { - super.read_scalefactor(stream, header); - if (channel2_allocation != 0) - { - switch (channel2_scfsi) - { - case 0: - channel2_scalefactor1 = scalefactors[stream.get_bits(6)]; - channel2_scalefactor2 = scalefactors[stream.get_bits(6)]; - channel2_scalefactor3 = scalefactors[stream.get_bits(6)]; - break; - - case 1: - channel2_scalefactor1 = channel2_scalefactor2 = - scalefactors[stream.get_bits(6)]; - channel2_scalefactor3 = scalefactors[stream.get_bits(6)]; - break; - - case 2: - channel2_scalefactor1 = channel2_scalefactor2 = - channel2_scalefactor3 = scalefactors[stream.get_bits(6)]; - break; - - case 3: - channel2_scalefactor1 = scalefactors[stream.get_bits(6)]; - channel2_scalefactor2 = channel2_scalefactor3 = - scalefactors[stream.get_bits(6)]; - break; - } - prepare_sample_reading(header, channel2_allocation, 1, - channel2_factor, channel2_codelength, channel2_c, - channel2_d); - } - } - - /** - * - */ - public boolean read_sampledata (Bitstream stream) - { - boolean returnvalue = super.read_sampledata(stream); - - if (channel2_allocation != 0) - if (groupingtable[1] != null) - { - int samplecode = stream.get_bits(channel2_codelength[0]); - // create requantized samples: - samplecode += samplecode << 1; - /* - float[] target = channel2_samples; - float[] source = channel2_groupingtable[0]; - int tmp = 0; - int temp = 0; - target[tmp++] = source[samplecode + temp]; - temp++; - target[tmp++] = source[samplecode + temp]; - temp++; - target[tmp] = source[samplecode + temp]; - // memcpy (channel2_samples, channel2_groupingtable + samplecode, 3 * sizeof (real)); - */ - float[] target = channel2_samples; - float[] source = groupingtable[1]; - int tmp = 0; - int temp = samplecode; - target[tmp] = source[temp]; - temp++;tmp++; - target[tmp] = source[temp]; - temp++;tmp++; - target[tmp] = source[temp]; - - } - else - { - channel2_samples[0] = (float) ((stream.get_bits(channel2_codelength[0])) * - channel2_factor[0] - 1.0); - channel2_samples[1] = (float) ((stream.get_bits(channel2_codelength[0])) * - channel2_factor[0] - 1.0); - channel2_samples[2] = (float) ((stream.get_bits(channel2_codelength[0])) * - channel2_factor[0] - 1.0); - } - return returnvalue; - } - - /** - * - */ - public boolean put_next_sample(int channels, SynthesisFilter filter1, SynthesisFilter filter2) - { - boolean returnvalue = super.put_next_sample(channels, filter1, filter2); - if ((channel2_allocation != 0) && (channels != OutputChannels.LEFT_CHANNEL)) - { - float sample = channel2_samples[samplenumber - 1]; - - if (groupingtable[1] == null) - sample = (sample + channel2_d[0]) * channel2_c[0]; - - if (groupnumber <= 4) - sample *= channel2_scalefactor1; - else if (groupnumber <= 8) - sample *= channel2_scalefactor2; - else - sample *= channel2_scalefactor3; - if (channels == OutputChannels.BOTH_CHANNELS) - filter2.input_sample(sample, subbandnumber); - else - filter1.input_sample(sample, subbandnumber); - } - return returnvalue; - } - } -} |