9fee0ec4ca
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7101 a1c6a512-1295-4272-9138-f99709370657
762 lines
21 KiB
Java
762 lines
21 KiB
Java
/*
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* 11/19/04 : 1.0 moved to LGPL.
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* VBRI header support added, E.B javalayer@javazoom.net
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*
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* 12/04/03 : VBR (XING) header support added, E.B javalayer@javazoom.net
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*
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* 02/13/99 : Java Conversion by JavaZOOM , E.B javalayer@javazoom.net
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*
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* Declarations for MPEG header class
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* A few layer III, MPEG-2 LSF, and seeking modifications made by Jeff Tsay.
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* Last modified : 04/19/97
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*
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* @(#) header.h 1.7, last edit: 6/15/94 16:55:33
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* @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de)
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* @(#) Berlin University of Technology
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*-----------------------------------------------------------------------
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*----------------------------------------------------------------------
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*/
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package javazoom.jl.decoder;
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/**
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* Class for extracting information from a frame header.
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*/
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public final class Header
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{
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public static final int[][] frequencies =
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{{22050, 24000, 16000, 1},
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{44100, 48000, 32000, 1},
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{11025, 12000, 8000, 1}}; // SZD: MPEG25
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/**
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* Constant for MPEG-2 LSF version
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*/
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public static final int MPEG2_LSF = 0;
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public static final int MPEG25_LSF = 2; // SZD
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/**
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* Constant for MPEG-1 version
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*/
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public static final int MPEG1 = 1;
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public static final int STEREO = 0;
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public static final int JOINT_STEREO = 1;
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public static final int DUAL_CHANNEL = 2;
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public static final int SINGLE_CHANNEL = 3;
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public static final int FOURTYFOUR_POINT_ONE = 0;
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public static final int FOURTYEIGHT=1;
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public static final int THIRTYTWO=2;
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private int h_layer, h_protection_bit, h_bitrate_index,
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h_padding_bit, h_mode_extension;
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private int h_version;
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private int h_mode;
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private int h_sample_frequency;
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private int h_number_of_subbands, h_intensity_stereo_bound;
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private boolean h_copyright, h_original;
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// VBR support added by E.B
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private double[] h_vbr_time_per_frame = {-1, 384, 1152, 1152};
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private boolean h_vbr;
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private int h_vbr_frames;
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private int h_vbr_scale;
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private int h_vbr_bytes;
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private byte[] h_vbr_toc;
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private byte syncmode = Bitstream.INITIAL_SYNC;
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private Crc16 crc;
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public short checksum;
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public int framesize;
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public int nSlots;
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private int _headerstring = -1; // E.B
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Header()
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{
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}
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public String toString()
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{
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StringBuffer buffer = new StringBuffer(200);
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buffer.append("Layer ");
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buffer.append(layer_string());
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buffer.append(" frame ");
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buffer.append(mode_string());
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buffer.append(' ');
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buffer.append(version_string());
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if (!checksums())
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buffer.append(" no");
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buffer.append(" checksums");
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buffer.append(' ');
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buffer.append(sample_frequency_string());
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buffer.append(',');
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buffer.append(' ');
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buffer.append(bitrate_string());
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String s = buffer.toString();
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return s;
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}
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/**
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* Read a 32-bit header from the bitstream.
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*/
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void read_header(Bitstream stream, Crc16[] crcp) throws BitstreamException
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{
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int headerstring;
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int channel_bitrate;
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boolean sync = false;
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do
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{
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headerstring = stream.syncHeader(syncmode);
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_headerstring = headerstring; // E.B
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if (syncmode == Bitstream.INITIAL_SYNC)
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{
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h_version = ((headerstring >>> 19) & 1);
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if (((headerstring >>> 20) & 1) == 0) // SZD: MPEG2.5 detection
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if (h_version == MPEG2_LSF)
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h_version = MPEG25_LSF;
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else
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throw stream.newBitstreamException(Bitstream.UNKNOWN_ERROR);
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if ((h_sample_frequency = ((headerstring >>> 10) & 3)) == 3)
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{
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throw stream.newBitstreamException(Bitstream.UNKNOWN_ERROR);
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}
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}
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h_layer = 4 - (headerstring >>> 17) & 3;
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h_protection_bit = (headerstring >>> 16) & 1;
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h_bitrate_index = (headerstring >>> 12) & 0xF;
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h_padding_bit = (headerstring >>> 9) & 1;
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h_mode = ((headerstring >>> 6) & 3);
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h_mode_extension = (headerstring >>> 4) & 3;
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if (h_mode == JOINT_STEREO)
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h_intensity_stereo_bound = (h_mode_extension << 2) + 4;
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else
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h_intensity_stereo_bound = 0; // should never be used
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if (((headerstring >>> 3) & 1) == 1)
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h_copyright = true;
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if (((headerstring >>> 2) & 1) == 1)
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h_original = true;
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// calculate number of subbands:
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if (h_layer == 1)
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h_number_of_subbands = 32;
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else
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{
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channel_bitrate = h_bitrate_index;
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// calculate bitrate per channel:
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if (h_mode != SINGLE_CHANNEL)
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if (channel_bitrate == 4)
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channel_bitrate = 1;
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else
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channel_bitrate -= 4;
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if ((channel_bitrate == 1) || (channel_bitrate == 2))
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if (h_sample_frequency == THIRTYTWO)
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h_number_of_subbands = 12;
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else
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h_number_of_subbands = 8;
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else if ((h_sample_frequency == FOURTYEIGHT) || ((channel_bitrate >= 3) && (channel_bitrate <= 5)))
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h_number_of_subbands = 27;
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else
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h_number_of_subbands = 30;
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}
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if (h_intensity_stereo_bound > h_number_of_subbands)
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h_intensity_stereo_bound = h_number_of_subbands;
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// calculate framesize and nSlots
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calculate_framesize();
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// read framedata:
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int framesizeloaded = stream.read_frame_data(framesize);
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if ((framesize >=0) && (framesizeloaded != framesize))
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{
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// Data loaded does not match to expected framesize,
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// it might be an ID3v1 TAG. (Fix 11/17/04).
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throw stream.newBitstreamException(Bitstream.INVALIDFRAME);
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}
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if (stream.isSyncCurrentPosition(syncmode))
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{
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if (syncmode == Bitstream.INITIAL_SYNC)
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{
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syncmode = Bitstream.STRICT_SYNC;
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stream.set_syncword(headerstring & 0xFFF80CC0);
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}
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sync = true;
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}
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else
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{
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stream.unreadFrame();
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}
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}
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while (!sync);
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stream.parse_frame();
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if (h_protection_bit == 0)
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{
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// frame contains a crc checksum
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checksum = (short) stream.get_bits(16);
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if (crc == null)
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crc = new Crc16();
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crc.add_bits(headerstring, 16);
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crcp[0] = crc;
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}
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else
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crcp[0] = null;
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if (h_sample_frequency == FOURTYFOUR_POINT_ONE)
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{
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/*
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if (offset == null)
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{
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int max = max_number_of_frames(stream);
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offset = new int[max];
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for(int i=0; i<max; i++) offset[i] = 0;
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}
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// E.B : Investigate more
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int cf = stream.current_frame();
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int lf = stream.last_frame();
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if ((cf > 0) && (cf == lf))
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{
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offset[cf] = offset[cf-1] + h_padding_bit;
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}
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else
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{
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offset[0] = h_padding_bit;
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}
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*/
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}
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}
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/**
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* Parse frame to extract optionnal VBR frame.
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* @param firstframe
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* @author E.B (javalayer@javazoom.net)
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*/
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void parseVBR(byte[] firstframe) throws BitstreamException
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{
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// Trying Xing header.
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String xing = "Xing";
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byte tmp[] = new byte[4];
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int offset = 0;
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// Compute "Xing" offset depending on MPEG version and channels.
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if (h_version == MPEG1)
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{
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if (h_mode == SINGLE_CHANNEL) offset=21-4;
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else offset=36-4;
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}
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else
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{
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if (h_mode == SINGLE_CHANNEL) offset=13-4;
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else offset = 21-4;
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}
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try
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{
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System.arraycopy(firstframe, offset, tmp, 0, 4);
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// Is "Xing" ?
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if (xing.equals(new String(tmp)))
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{
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//Yes.
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h_vbr = true;
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h_vbr_frames = -1;
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h_vbr_bytes = -1;
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h_vbr_scale = -1;
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h_vbr_toc = new byte[100];
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int length = 4;
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// Read flags.
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byte flags[] = new byte[4];
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System.arraycopy(firstframe, offset + length, flags, 0, flags.length);
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length += flags.length;
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// Read number of frames (if available).
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if ((flags[3] & (byte) (1 << 0)) != 0)
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{
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System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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h_vbr_frames = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
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length += 4;
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}
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// Read size (if available).
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if ((flags[3] & (byte) (1 << 1)) != 0)
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{
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System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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h_vbr_bytes = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
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length += 4;
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}
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// Read TOC (if available).
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if ((flags[3] & (byte) (1 << 2)) != 0)
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{
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System.arraycopy(firstframe, offset + length, h_vbr_toc, 0, h_vbr_toc.length);
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length += h_vbr_toc.length;
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}
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// Read scale (if available).
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if ((flags[3] & (byte) (1 << 3)) != 0)
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{
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System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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h_vbr_scale = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
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length += 4;
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}
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//System.out.println("VBR:"+xing+" Frames:"+ h_vbr_frames +" Size:"+h_vbr_bytes);
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}
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}
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catch (ArrayIndexOutOfBoundsException e)
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{
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throw new BitstreamException("XingVBRHeader Corrupted",e);
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}
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// Trying VBRI header.
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String vbri = "VBRI";
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offset = 36-4;
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try
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{
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System.arraycopy(firstframe, offset, tmp, 0, 4);
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// Is "VBRI" ?
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if (vbri.equals(new String(tmp)))
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{
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//Yes.
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h_vbr = true;
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h_vbr_frames = -1;
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h_vbr_bytes = -1;
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h_vbr_scale = -1;
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h_vbr_toc = new byte[100];
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// Bytes.
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int length = 4 + 6;
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System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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h_vbr_bytes = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
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length += 4;
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// Frames.
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System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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h_vbr_frames = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
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length += 4;
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//System.out.println("VBR:"+vbri+" Frames:"+ h_vbr_frames +" Size:"+h_vbr_bytes);
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// TOC
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// TODO
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}
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}
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catch (ArrayIndexOutOfBoundsException e)
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{
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throw new BitstreamException("VBRIVBRHeader Corrupted",e);
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}
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}
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// Functions to query header contents:
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/**
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* Returns version.
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*/
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public int version() { return h_version; }
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/**
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* Returns Layer ID.
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*/
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public int layer() { return h_layer; }
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/**
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* Returns bitrate index.
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*/
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public int bitrate_index() { return h_bitrate_index; }
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/**
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* Returns Sample Frequency.
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*/
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public int sample_frequency() { return h_sample_frequency; }
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/**
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* Returns Frequency.
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*/
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public int frequency() {return frequencies[h_version][h_sample_frequency];}
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/**
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* Returns Mode.
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*/
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public int mode() { return h_mode; }
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/**
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* Returns Protection bit.
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*/
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public boolean checksums()
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{
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if (h_protection_bit == 0) return true;
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else return false;
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}
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/**
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* Returns Copyright.
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*/
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public boolean copyright() { return h_copyright; }
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/**
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* Returns Original.
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*/
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public boolean original() { return h_original; }
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/**
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* Return VBR.
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* @return true if VBR header is found
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*/
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public boolean vbr() { return h_vbr; }
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/**
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* Return VBR scale.
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* @return scale of -1 if not available
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*/
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public int vbr_scale() { return h_vbr_scale; }
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/**
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* Return VBR TOC.
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* @return vbr toc ot null if not available
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*/
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public byte[] vbr_toc() { return h_vbr_toc; }
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/**
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* Returns Checksum flag.
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* Compares computed checksum with stream checksum.
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*/
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public boolean checksum_ok () { return (checksum == crc.checksum()); }
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// Seeking and layer III stuff
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/**
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* Returns Layer III Padding bit.
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*/
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public boolean padding()
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{
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if (h_padding_bit == 0) return false;
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else return true;
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}
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/**
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* Returns Slots.
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*/
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public int slots() { return nSlots; }
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/**
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* Returns Mode Extension.
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*/
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public int mode_extension() { return h_mode_extension; }
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// E.B -> private to public
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public static final int bitrates[][][] = {
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{{0 /*free format*/, 32000, 48000, 56000, 64000, 80000, 96000,
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112000, 128000, 144000, 160000, 176000, 192000 ,224000, 256000, 0},
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{0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
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56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0},
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{0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
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56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0}},
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{{0 /*free format*/, 32000, 64000, 96000, 128000, 160000, 192000,
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224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000, 0},
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{0 /*free format*/, 32000, 48000, 56000, 64000, 80000, 96000,
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112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000, 0},
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{0 /*free format*/, 32000, 40000, 48000, 56000, 64000, 80000,
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96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 0}},
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// SZD: MPEG2.5
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{{0 /*free format*/, 32000, 48000, 56000, 64000, 80000, 96000,
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112000, 128000, 144000, 160000, 176000, 192000 ,224000, 256000, 0},
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{0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
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56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0},
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{0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
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56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0}},
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};
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// E.B -> private to public
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/**
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* Calculate Frame size.
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* Calculates framesize in bytes excluding header size.
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*/
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public int calculate_framesize()
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{
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if (h_layer == 1)
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{
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framesize = (12 * bitrates[h_version][0][h_bitrate_index]) /
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frequencies[h_version][h_sample_frequency];
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if (h_padding_bit != 0 ) framesize++;
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framesize <<= 2; // one slot is 4 bytes long
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nSlots = 0;
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}
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else
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{
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framesize = (144 * bitrates[h_version][h_layer - 1][h_bitrate_index]) /
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frequencies[h_version][h_sample_frequency];
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if (h_version == MPEG2_LSF || h_version == MPEG25_LSF) framesize >>= 1; // SZD
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if (h_padding_bit != 0) framesize++;
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// Layer III slots
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if (h_layer == 3)
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{
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if (h_version == MPEG1)
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{
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nSlots = framesize - ((h_mode == SINGLE_CHANNEL) ? 17 : 32) // side info size
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- ((h_protection_bit!=0) ? 0 : 2) // CRC size
|
|
- 4; // header size
|
|
}
|
|
else
|
|
{ // MPEG-2 LSF, SZD: MPEG-2.5 LSF
|
|
nSlots = framesize - ((h_mode == SINGLE_CHANNEL) ? 9 : 17) // side info size
|
|
- ((h_protection_bit!=0) ? 0 : 2) // CRC size
|
|
- 4; // header size
|
|
}
|
|
}
|
|
else
|
|
{
|
|
nSlots = 0;
|
|
}
|
|
}
|
|
framesize -= 4; // subtract header size
|
|
return framesize;
|
|
}
|
|
|
|
/**
|
|
* Returns the maximum number of frames in the stream.
|
|
* @param streamsize
|
|
* @return number of frames
|
|
*/
|
|
public int max_number_of_frames(int streamsize) // E.B
|
|
{
|
|
if (h_vbr == true) return h_vbr_frames;
|
|
else
|
|
{
|
|
if ((framesize + 4 - h_padding_bit) == 0) return 0;
|
|
else return(streamsize / (framesize + 4 - h_padding_bit));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the maximum number of frames in the stream.
|
|
* @param streamsize
|
|
* @return number of frames
|
|
*/
|
|
public int min_number_of_frames(int streamsize) // E.B
|
|
{
|
|
if (h_vbr == true) return h_vbr_frames;
|
|
else
|
|
{
|
|
if ((framesize + 5 - h_padding_bit) == 0) return 0;
|
|
else return(streamsize / (framesize + 5 - h_padding_bit));
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns ms/frame.
|
|
* @return milliseconds per frame
|
|
*/
|
|
public float ms_per_frame() // E.B
|
|
{
|
|
if (h_vbr == true)
|
|
{
|
|
double tpf = h_vbr_time_per_frame[layer()] / frequency();
|
|
if ((h_version == MPEG2_LSF) || (h_version == MPEG25_LSF)) tpf /= 2;
|
|
return ((float) (tpf * 1000));
|
|
}
|
|
else
|
|
{
|
|
float ms_per_frame_array[][] = {{8.707483f, 8.0f, 12.0f},
|
|
{26.12245f, 24.0f, 36.0f},
|
|
{26.12245f, 24.0f, 36.0f}};
|
|
return(ms_per_frame_array[h_layer-1][h_sample_frequency]);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns total ms.
|
|
* @param streamsize
|
|
* @return total milliseconds
|
|
*/
|
|
public float total_ms(int streamsize) // E.B
|
|
{
|
|
return(max_number_of_frames(streamsize) * ms_per_frame());
|
|
}
|
|
|
|
/**
|
|
* Returns synchronized header.
|
|
*/
|
|
public int getSyncHeader() // E.B
|
|
{
|
|
return _headerstring;
|
|
}
|
|
|
|
// functions which return header informations as strings:
|
|
/**
|
|
* Return Layer version.
|
|
*/
|
|
public String layer_string()
|
|
{
|
|
switch (h_layer)
|
|
{
|
|
case 1:
|
|
return "I";
|
|
case 2:
|
|
return "II";
|
|
case 3:
|
|
return "III";
|
|
}
|
|
return null;
|
|
}
|
|
|
|
// E.B -> private to public
|
|
public static final String bitrate_str[][][] = {
|
|
{{"free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s",
|
|
"80 kbit/s", "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s",
|
|
"160 kbit/s", "176 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s",
|
|
"forbidden"},
|
|
{"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
|
|
"40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
|
|
"96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
|
|
"forbidden"},
|
|
{"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
|
|
"40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
|
|
"96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
|
|
"forbidden"}},
|
|
|
|
{{"free format", "32 kbit/s", "64 kbit/s", "96 kbit/s", "128 kbit/s",
|
|
"160 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s", "288 kbit/s",
|
|
"320 kbit/s", "352 kbit/s", "384 kbit/s", "416 kbit/s", "448 kbit/s",
|
|
"forbidden"},
|
|
{"free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s",
|
|
"80 kbit/s", "96 kbit/s", "112 kbit/s", "128 kbit/s", "160 kbit/s",
|
|
"192 kbit/s", "224 kbit/s", "256 kbit/s", "320 kbit/s", "384 kbit/s",
|
|
"forbidden"},
|
|
{"free format", "32 kbit/s", "40 kbit/s", "48 kbit/s", "56 kbit/s",
|
|
"64 kbit/s", "80 kbit/s" , "96 kbit/s", "112 kbit/s", "128 kbit/s",
|
|
"160 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s", "320 kbit/s",
|
|
"forbidden"}},
|
|
// SZD: MPEG2.5
|
|
{{"free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s",
|
|
"80 kbit/s", "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s",
|
|
"160 kbit/s", "176 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s",
|
|
"forbidden"},
|
|
{"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
|
|
"40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
|
|
"96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
|
|
"forbidden"},
|
|
{"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
|
|
"40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
|
|
"96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
|
|
"forbidden"}},
|
|
};
|
|
|
|
/**
|
|
* Return Bitrate.
|
|
* @return bitrate in bps
|
|
*/
|
|
public String bitrate_string()
|
|
{
|
|
if (h_vbr == true)
|
|
{
|
|
return Integer.toString(bitrate()/1000)+" kb/s";
|
|
}
|
|
else return bitrate_str[h_version][h_layer - 1][h_bitrate_index];
|
|
}
|
|
|
|
/**
|
|
* Return Bitrate.
|
|
* @return bitrate in bps and average bitrate for VBR header
|
|
*/
|
|
public int bitrate()
|
|
{
|
|
if (h_vbr == true)
|
|
{
|
|
return ((int) ((h_vbr_bytes * 8) / (ms_per_frame() * h_vbr_frames)))*1000;
|
|
}
|
|
else return bitrates[h_version][h_layer - 1][h_bitrate_index];
|
|
}
|
|
|
|
/**
|
|
* Return Instant Bitrate.
|
|
* Bitrate for VBR is not constant.
|
|
* @return bitrate in bps
|
|
*/
|
|
public int bitrate_instant()
|
|
{
|
|
return bitrates[h_version][h_layer - 1][h_bitrate_index];
|
|
}
|
|
|
|
/**
|
|
* Returns Frequency
|
|
* @return frequency string in kHz
|
|
*/
|
|
public String sample_frequency_string()
|
|
{
|
|
switch (h_sample_frequency)
|
|
{
|
|
case THIRTYTWO:
|
|
if (h_version == MPEG1)
|
|
return "32 kHz";
|
|
else if (h_version == MPEG2_LSF)
|
|
return "16 kHz";
|
|
else // SZD
|
|
return "8 kHz";
|
|
case FOURTYFOUR_POINT_ONE:
|
|
if (h_version == MPEG1)
|
|
return "44.1 kHz";
|
|
else if (h_version == MPEG2_LSF)
|
|
return "22.05 kHz";
|
|
else // SZD
|
|
return "11.025 kHz";
|
|
case FOURTYEIGHT:
|
|
if (h_version == MPEG1)
|
|
return "48 kHz";
|
|
else if (h_version == MPEG2_LSF)
|
|
return "24 kHz";
|
|
else // SZD
|
|
return "12 kHz";
|
|
}
|
|
return(null);
|
|
}
|
|
|
|
/**
|
|
* Returns Mode.
|
|
*/
|
|
public String mode_string()
|
|
{
|
|
switch (h_mode)
|
|
{
|
|
case STEREO:
|
|
return "Stereo";
|
|
case JOINT_STEREO:
|
|
return "Joint stereo";
|
|
case DUAL_CHANNEL:
|
|
return "Dual channel";
|
|
case SINGLE_CHANNEL:
|
|
return "Single channel";
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Returns Version.
|
|
* @return MPEG-1 or MPEG-2 LSF or MPEG-2.5 LSF
|
|
*/
|
|
public String version_string()
|
|
{
|
|
switch (h_version)
|
|
{
|
|
case MPEG1:
|
|
return "MPEG-1";
|
|
case MPEG2_LSF:
|
|
return "MPEG-2 LSF";
|
|
case MPEG25_LSF: // SZD
|
|
return "MPEG-2.5 LSF";
|
|
}
|
|
return(null);
|
|
}
|
|
|
|
/**
|
|
* Returns the number of subbands in the current frame.
|
|
* @return number of subbands
|
|
*/
|
|
public int number_of_subbands() {return h_number_of_subbands;}
|
|
|
|
/**
|
|
* Returns Intensity Stereo.
|
|
* (Layer II joint stereo only).
|
|
* Returns the number of subbands which are in stereo mode,
|
|
* subbands above that limit are in intensity stereo mode.
|
|
* @return intensity
|
|
*/
|
|
public int intensity_stereo_bound() {return h_intensity_stereo_bound;}
|
|
}
|