2 * 11/19/04 : 1.0 moved to LGPL.
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3 * VBRI header support added, E.B javalayer@javazoom.net
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5 * 12/04/03 : VBR (XING) header support added, E.B javalayer@javazoom.net
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7 * 02/13/99 : Java Conversion by JavaZOOM , E.B javalayer@javazoom.net
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9 * Declarations for MPEG header class
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10 * A few layer III, MPEG-2 LSF, and seeking modifications made by Jeff Tsay.
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11 * Last modified : 04/19/97
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13 * @(#) header.h 1.7, last edit: 6/15/94 16:55:33
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14 * @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de)
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15 * @(#) Berlin University of Technology
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16 *-----------------------------------------------------------------------
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17 * This program is free software; you can redistribute it and/or modify
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18 * it under the terms of the GNU Library General Public License as published
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19 * by the Free Software Foundation; either version 2 of the License, or
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20 * (at your option) any later version.
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22 * This program is distributed in the hope that it will be useful,
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23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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25 * GNU Library General Public License for more details.
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27 * You should have received a copy of the GNU Library General Public
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28 * License along with this program; if not, write to the Free Software
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29 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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30 *----------------------------------------------------------------------
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34 * Class for extracting information from a frame header.
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36 @LATTICE("HI<HNS,HNS<H,C<H,NS<FS,FS<H,FS<HV,H<SYNC,HV<SYNC,HV<T,SYNC*,HV*,FS*,HI*")
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37 @METHODDEFAULT("OUT<V,V<THIS,THIS<SH,SH<IN,SH*,THISLOC=THIS,GLOBALLOC=IN")
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38 public final class Header
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40 @LOC("T") public static final int[][] frequencies =
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41 {{22050, 24000, 16000, 1},
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42 {44100, 48000, 32000, 1},
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43 {11025, 12000, 8000, 1}}; // SZD: MPEG25
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46 * Constant for MPEG-2 LSF version
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48 @LOC("T") public static final int MPEG2_LSF = 0;
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49 @LOC("T") public static final int MPEG25_LSF = 2; // SZD
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52 * Constant for MPEG-1 version
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54 @LOC("T") public static final int MPEG1 = 1;
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56 @LOC("T") public static final int STEREO = 0;
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57 @LOC("T") public static final int JOINT_STEREO = 1;
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58 @LOC("T") public static final int DUAL_CHANNEL = 2;
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59 @LOC("T") public static final int SINGLE_CHANNEL = 3;
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60 @LOC("T") public static final int FOURTYFOUR_POINT_ONE = 0;
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61 @LOC("T") public static final int FOURTYEIGHT=1;
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62 @LOC("T") public static final int THIRTYTWO=2;
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64 @LOC("H") private int h_layer;
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65 @LOC("H") private int h_protection_bit;
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66 @LOC("H") private int h_bitrate_index;
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67 @LOC("H") private int h_padding_bit;
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68 @LOC("H") private int h_mode_extension;
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69 @LOC("HV") private int h_version;
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70 @LOC("H") private int h_mode;
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71 @LOC("H") private int h_sample_frequency;
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72 @LOC("HNS") private int h_number_of_subbands;
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73 @LOC("HI") private int h_intensity_stereo_bound;
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74 @LOC("H") private boolean h_copyright;
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75 @LOC("H") private int h_original;
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76 // VBR support added by E.B
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77 @LOC("T") private double[] h_vbr_time_per_frame = {-1, 384, 1152, 1152};
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78 @LOC("T") private boolean h_vbr;
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79 @LOC("T") private int h_vbr_frames;
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80 @LOC("T") private int h_vbr_scale;
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81 @LOC("T") private int h_vbr_bytes;
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82 @LOC("T") private byte[] h_vbr_toc;
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84 @LOC("SYNC") private byte syncmode = Bitstream.INITIAL_SYNC;
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85 @LOC("C") private Crc16 crc;
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87 @LOC("C") public short checksum;
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88 @LOC("FS") public int framesize;
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89 @LOC("NS") public int nSlots;
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91 @LOC("T") private int _headerstring = -1; // E.B
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96 public String toString()
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98 StringBuffer buffer = new StringBuffer(200);
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99 buffer.append("Layer ");
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100 buffer.append(layer_string());
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101 buffer.append(" frame ");
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102 buffer.append(mode_string());
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103 buffer.append(' ');
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104 buffer.append(version_string());
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106 buffer.append(" no");
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107 buffer.append(" checksums");
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108 buffer.append(' ');
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109 buffer.append(sample_frequency_string());
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110 buffer.append(',');
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111 buffer.append(' ');
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112 buffer.append(bitrate_string());
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114 String s = buffer.toString();
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119 * Read a 32-bit header from the bitstream.
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121 void read_header(Bitstream stream, Crc16[] crcp) throws BitstreamException
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124 int channel_bitrate;
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125 boolean sync = false;
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128 headerstring = stream.syncHeader(syncmode);
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129 _headerstring = headerstring; // E.B
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130 if (syncmode == Bitstream.INITIAL_SYNC)
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132 h_version = ((headerstring >>> 19) & 1);
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133 if (((headerstring >>> 20) & 1) == 0) // SZD: MPEG2.5 detection
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134 if (h_version == MPEG2_LSF)
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135 h_version = MPEG25_LSF;
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137 throw stream.newBitstreamException(Bitstream.UNKNOWN_ERROR);
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138 if ((h_sample_frequency = ((headerstring >>> 10) & 3)) == 3)
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140 throw stream.newBitstreamException(Bitstream.UNKNOWN_ERROR);
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143 h_layer = 4 - (headerstring >>> 17) & 3;
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144 h_protection_bit = (headerstring >>> 16) & 1;
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145 h_bitrate_index = (headerstring >>> 12) & 0xF;
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146 h_padding_bit = (headerstring >>> 9) & 1;
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147 h_mode = ((headerstring >>> 6) & 3);
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148 h_mode_extension = (headerstring >>> 4) & 3;
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149 if (h_mode == JOINT_STEREO)
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150 h_intensity_stereo_bound = (h_mode_extension << 2) + 4;
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152 h_intensity_stereo_bound = 0; // should never be used
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153 if (((headerstring >>> 3) & 1) == 1)
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154 h_copyright = true;
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155 if (((headerstring >>> 2) & 1) == 1)
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157 // calculate number of subbands:
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159 h_number_of_subbands = 32;
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162 channel_bitrate = h_bitrate_index;
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163 // calculate bitrate per channel:
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164 if (h_mode != SINGLE_CHANNEL)
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165 if (channel_bitrate == 4)
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166 channel_bitrate = 1;
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168 channel_bitrate -= 4;
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169 if ((channel_bitrate == 1) || (channel_bitrate == 2))
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170 if (h_sample_frequency == THIRTYTWO)
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171 h_number_of_subbands = 12;
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173 h_number_of_subbands = 8;
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174 else if ((h_sample_frequency == FOURTYEIGHT) || ((channel_bitrate >= 3) && (channel_bitrate <= 5)))
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175 h_number_of_subbands = 27;
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177 h_number_of_subbands = 30;
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179 if (h_intensity_stereo_bound > h_number_of_subbands)
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180 h_intensity_stereo_bound = h_number_of_subbands;
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181 // calculate framesize and nSlots
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182 calculate_framesize();
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184 int framesizeloaded = stream.read_frame_data(framesize);
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185 if ((framesize >=0) && (framesizeloaded != framesize))
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187 // Data loaded does not match to expected framesize,
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188 // it might be an ID3v1 TAG. (Fix 11/17/04).
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189 throw stream.newBitstreamException(Bitstream.INVALIDFRAME);
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191 if (stream.isSyncCurrentPosition(syncmode))
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193 if (syncmode == Bitstream.INITIAL_SYNC)
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195 syncmode = Bitstream.STRICT_SYNC;
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196 stream.set_syncword(headerstring & 0xFFF80CC0);
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202 stream.unreadFrame();
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206 stream.parse_frame();
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207 if (h_protection_bit == 0)
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209 // frame contains a crc checksum
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210 checksum = (short) stream.get_bits(16);
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213 crc.add_bits(headerstring, 16);
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218 if (h_sample_frequency == FOURTYFOUR_POINT_ONE)
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221 if (offset == null)
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223 int max = max_number_of_frames(stream);
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224 offset = new int[max];
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225 for(int i=0; i<max; i++) offset[i] = 0;
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227 // E.B : Investigate more
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228 int cf = stream.current_frame();
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229 int lf = stream.last_frame();
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230 if ((cf > 0) && (cf == lf))
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232 offset[cf] = offset[cf-1] + h_padding_bit;
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236 offset[0] = h_padding_bit;
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243 * Parse frame to extract optionnal VBR frame.
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244 * @param firstframe
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245 * @author E.B (javalayer@javazoom.net)
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247 void parseVBR(byte[] firstframe) throws BitstreamException
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249 // Trying Xing header.
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250 String xing = "Xing";
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251 byte tmp[] = new byte[4];
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253 // Compute "Xing" offset depending on MPEG version and channels.
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254 if (h_version == MPEG1)
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256 if (h_mode == SINGLE_CHANNEL) offset=21-4;
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261 if (h_mode == SINGLE_CHANNEL) offset=13-4;
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262 else offset = 21-4;
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266 System.arraycopy(firstframe, offset, tmp, 0, 4);
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268 if (xing.equals(new String(tmp)))
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275 h_vbr_toc = new byte[100];
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279 byte flags[] = new byte[4];
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280 System.arraycopy(firstframe, offset + length, flags, 0, flags.length);
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281 length += flags.length;
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282 // Read number of frames (if available).
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283 if ((flags[3] & (byte) (1 << 0)) != 0)
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285 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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286 h_vbr_frames = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
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289 // Read size (if available).
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290 if ((flags[3] & (byte) (1 << 1)) != 0)
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292 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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293 h_vbr_bytes = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
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296 // Read TOC (if available).
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297 if ((flags[3] & (byte) (1 << 2)) != 0)
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299 System.arraycopy(firstframe, offset + length, h_vbr_toc, 0, h_vbr_toc.length);
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300 length += h_vbr_toc.length;
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302 // Read scale (if available).
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303 if ((flags[3] & (byte) (1 << 3)) != 0)
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305 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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306 h_vbr_scale = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
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309 //System.out.println("VBR:"+xing+" Frames:"+ h_vbr_frames +" Size:"+h_vbr_bytes);
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312 catch (ArrayIndexOutOfBoundsException e)
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314 throw new BitstreamException("XingVBRHeader Corrupted",e);
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317 // Trying VBRI header.
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318 String vbri = "VBRI";
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322 System.arraycopy(firstframe, offset, tmp, 0, 4);
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324 if (vbri.equals(new String(tmp)))
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331 h_vbr_toc = new byte[100];
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333 int length = 4 + 6;
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334 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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335 h_vbr_bytes = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
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338 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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339 h_vbr_frames = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
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341 //System.out.println("VBR:"+vbri+" Frames:"+ h_vbr_frames +" Size:"+h_vbr_bytes);
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346 catch (ArrayIndexOutOfBoundsException e)
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348 throw new BitstreamException("VBRIVBRHeader Corrupted",e);
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352 // Functions to query header contents:
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356 public int version() { return h_version; }
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359 * Returns Layer ID.
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361 public int layer() { return h_layer; }
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364 * Returns bitrate index.
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366 public int bitrate_index() { return h_bitrate_index; }
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369 * Returns Sample Frequency.
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371 public int sample_frequency() { return h_sample_frequency; }
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374 * Returns Frequency.
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376 public int frequency() {return frequencies[h_version][h_sample_frequency];}
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381 public int mode() { return h_mode; }
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384 * Returns Protection bit.
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386 public boolean checksums()
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388 if (h_protection_bit == 0) return true;
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393 * Returns Copyright.
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395 public boolean copyright() { return h_copyright; }
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398 * Returns Original.
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400 public boolean original() { return h_original; }
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404 * @return true if VBR header is found
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406 public boolean vbr() { return h_vbr; }
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409 * Return VBR scale.
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410 * @return scale of -1 if not available
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412 public int vbr_scale() { return h_vbr_scale; }
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416 * @return vbr toc ot null if not available
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418 public byte[] vbr_toc() { return h_vbr_toc; }
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421 * Returns Checksum flag.
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422 * Compares computed checksum with stream checksum.
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424 public boolean checksum_ok () { return (checksum == crc.checksum()); }
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426 // Seeking and layer III stuff
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428 * Returns Layer III Padding bit.
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430 public boolean padding()
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432 if (h_padding_bit == 0) return false;
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439 public int slots() { return nSlots; }
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442 * Returns Mode Extension.
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444 public int mode_extension() { return h_mode_extension; }
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446 // E.B -> private to public
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447 @LOC("T") public static final int bitrates[][][] = {
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448 {{0 /*free format*/, 32000, 48000, 56000, 64000, 80000, 96000,
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449 112000, 128000, 144000, 160000, 176000, 192000 ,224000, 256000, 0},
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450 {0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
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451 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0},
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452 {0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
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453 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0}},
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455 {{0 /*free format*/, 32000, 64000, 96000, 128000, 160000, 192000,
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456 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000, 0},
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457 {0 /*free format*/, 32000, 48000, 56000, 64000, 80000, 96000,
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458 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000, 0},
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459 {0 /*free format*/, 32000, 40000, 48000, 56000, 64000, 80000,
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460 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 0}},
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462 {{0 /*free format*/, 32000, 48000, 56000, 64000, 80000, 96000,
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463 112000, 128000, 144000, 160000, 176000, 192000 ,224000, 256000, 0},
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464 {0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
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465 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0},
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466 {0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
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467 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0}},
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471 // E.B -> private to public
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473 * Calculate Frame size.
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474 * Calculates framesize in bytes excluding header size.
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476 public int calculate_framesize()
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481 framesize = (12 * bitrates[h_version][0][h_bitrate_index]) /
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482 frequencies[h_version][h_sample_frequency];
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483 if (h_padding_bit != 0 ) framesize++;
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484 framesize <<= 2; // one slot is 4 bytes long
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489 framesize = (144 * bitrates[h_version][h_layer - 1][h_bitrate_index]) /
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490 frequencies[h_version][h_sample_frequency];
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491 if (h_version == MPEG2_LSF || h_version == MPEG25_LSF) framesize >>= 1; // SZD
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492 if (h_padding_bit != 0) framesize++;
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496 if (h_version == MPEG1)
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498 nSlots = framesize - ((h_mode == SINGLE_CHANNEL) ? 17 : 32) // side info size
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499 - ((h_protection_bit!=0) ? 0 : 2) // CRC size
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500 - 4; // header size
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503 { // MPEG-2 LSF, SZD: MPEG-2.5 LSF
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504 nSlots = framesize - ((h_mode == SINGLE_CHANNEL) ? 9 : 17) // side info size
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505 - ((h_protection_bit!=0) ? 0 : 2) // CRC size
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506 - 4; // header size
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514 framesize -= 4; // subtract header size
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519 * Returns the maximum number of frames in the stream.
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520 * @param streamsize
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521 * @return number of frames
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523 public int max_number_of_frames(int streamsize) // E.B
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525 if (h_vbr == true) return h_vbr_frames;
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528 if ((framesize + 4 - h_padding_bit) == 0) return 0;
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529 else return(streamsize / (framesize + 4 - h_padding_bit));
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534 * Returns the maximum number of frames in the stream.
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535 * @param streamsize
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536 * @return number of frames
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538 public int min_number_of_frames(int streamsize) // E.B
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540 if (h_vbr == true) return h_vbr_frames;
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543 if ((framesize + 5 - h_padding_bit) == 0) return 0;
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544 else return(streamsize / (framesize + 5 - h_padding_bit));
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550 * Returns ms/frame.
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551 * @return milliseconds per frame
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553 public float ms_per_frame() // E.B
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557 double tpf = h_vbr_time_per_frame[layer()] / frequency();
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558 if ((h_version == MPEG2_LSF) || (h_version == MPEG25_LSF)) tpf /= 2;
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559 return ((float) (tpf * 1000));
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563 float ms_per_frame_array[][] = {{8.707483f, 8.0f, 12.0f},
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564 {26.12245f, 24.0f, 36.0f},
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565 {26.12245f, 24.0f, 36.0f}};
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566 return(ms_per_frame_array[h_layer-1][h_sample_frequency]);
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571 * Returns total ms.
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572 * @param streamsize
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573 * @return total milliseconds
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575 public float total_ms(int streamsize) // E.B
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577 return(max_number_of_frames(streamsize) * ms_per_frame());
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581 * Returns synchronized header.
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583 public int getSyncHeader() // E.B
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585 return _headerstring;
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588 // functions which return header informations as strings:
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590 * Return Layer version.
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592 public String layer_string()
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606 // E.B -> private to public
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607 @LOC("T") public static final String bitrate_str[][][] = {
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608 {{"free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s",
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609 "80 kbit/s", "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s",
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610 "160 kbit/s", "176 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s",
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612 {"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
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613 "40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
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614 "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
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616 {"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
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617 "40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
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618 "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
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621 {{"free format", "32 kbit/s", "64 kbit/s", "96 kbit/s", "128 kbit/s",
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622 "160 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s", "288 kbit/s",
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623 "320 kbit/s", "352 kbit/s", "384 kbit/s", "416 kbit/s", "448 kbit/s",
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625 {"free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s",
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626 "80 kbit/s", "96 kbit/s", "112 kbit/s", "128 kbit/s", "160 kbit/s",
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627 "192 kbit/s", "224 kbit/s", "256 kbit/s", "320 kbit/s", "384 kbit/s",
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629 {"free format", "32 kbit/s", "40 kbit/s", "48 kbit/s", "56 kbit/s",
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630 "64 kbit/s", "80 kbit/s" , "96 kbit/s", "112 kbit/s", "128 kbit/s",
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631 "160 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s", "320 kbit/s",
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634 {{"free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s",
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635 "80 kbit/s", "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s",
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636 "160 kbit/s", "176 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s",
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638 {"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
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639 "40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
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640 "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
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642 {"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
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643 "40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
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644 "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
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650 * @return bitrate in bps
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652 public String bitrate_string()
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656 return Integer.toString(bitrate()/1000)+" kb/s";
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658 else return bitrate_str[h_version][h_layer - 1][h_bitrate_index];
\r
663 * @return bitrate in bps and average bitrate for VBR header
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665 public int bitrate()
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669 return ((int) ((h_vbr_bytes * 8) / (ms_per_frame() * h_vbr_frames)))*1000;
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671 else return bitrates[h_version][h_layer - 1][h_bitrate_index];
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675 * Return Instant Bitrate.
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676 * Bitrate for VBR is not constant.
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677 * @return bitrate in bps
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679 public int bitrate_instant()
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681 return bitrates[h_version][h_layer - 1][h_bitrate_index];
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685 * Returns Frequency
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686 * @return frequency string in kHz
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688 public String sample_frequency_string()
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690 switch (h_sample_frequency)
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693 if (h_version == MPEG1)
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695 else if (h_version == MPEG2_LSF)
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699 case FOURTYFOUR_POINT_ONE:
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700 if (h_version == MPEG1)
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702 else if (h_version == MPEG2_LSF)
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703 return "22.05 kHz";
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705 return "11.025 kHz";
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707 if (h_version == MPEG1)
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709 else if (h_version == MPEG2_LSF)
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720 public String mode_string()
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727 return "Joint stereo";
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729 return "Dual channel";
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730 case SINGLE_CHANNEL:
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731 return "Single channel";
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738 * @return MPEG-1 or MPEG-2 LSF or MPEG-2.5 LSF
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740 public String version_string()
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747 return "MPEG-2 LSF";
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748 case MPEG25_LSF: // SZD
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749 return "MPEG-2.5 LSF";
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755 * Returns the number of subbands in the current frame.
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756 * @return number of subbands
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758 public int number_of_subbands() {return h_number_of_subbands;}
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761 * Returns Intensity Stereo.
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762 * (Layer II joint stereo only).
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763 * Returns the number of subbands which are in stereo mode,
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764 * subbands above that limit are in intensity stereo mode.
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765 * @return intensity
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767 public int intensity_stereo_bound() {return h_intensity_stereo_bound;}
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