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 public static final int[][] frequencies = { { 22050, 24000, 16000, 1 },
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41 { 44100, 48000, 32000, 1 }, { 11025, 12000, 8000, 1 } }; // SZD: MPEG25
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44 * Constant for MPEG-2 LSF version
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46 public static final int MPEG2_LSF = 0;
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47 public static final int MPEG25_LSF = 2; // SZD
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50 * Constant for MPEG-1 version
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52 public static final int MPEG1 = 1;
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54 public static final int STEREO = 0;
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55 public static final int JOINT_STEREO = 1;
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56 public static final int DUAL_CHANNEL = 2;
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57 public static final int SINGLE_CHANNEL = 3;
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58 public static final int FOURTYFOUR_POINT_ONE = 0;
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59 public static final int FOURTYEIGHT = 1;
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60 public static final int THIRTYTWO = 2;
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63 private int h_layer;
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65 private int h_protection_bit;
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67 private int h_bitrate_index;
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69 private int h_padding_bit;
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71 private int h_mode_extension;
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73 private int h_version;
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77 private int h_sample_frequency;
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79 private int h_number_of_subbands;
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81 private int h_intensity_stereo_bound;
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83 private boolean h_copyright;
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85 private boolean h_original;
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86 // VBR support added by E.B
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88 private double[] h_vbr_time_per_frame = { -1.0, 384.0, 1152.0, 1152.0 };
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90 private boolean h_vbr;
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92 private int h_vbr_frames;
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94 private int h_vbr_scale;
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96 private int h_vbr_bytes;
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98 private byte[] h_vbr_toc;
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101 private byte syncmode = Bitstream.INITIAL_SYNC;
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106 public short checksum;
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108 public int framesize;
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113 private int _headerstring = -1; // E.B
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118 public String toString() {
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119 StringBuffer buffer = new StringBuffer(200);
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120 buffer.append("Layer ");
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121 buffer.append(layer_string());
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122 buffer.append(" frame ");
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123 buffer.append(mode_string());
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124 buffer.append(' ');
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125 buffer.append(version_string());
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127 buffer.append(" no");
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128 buffer.append(" checksums");
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129 buffer.append(' ');
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130 buffer.append(sample_frequency_string());
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131 buffer.append(',');
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132 buffer.append(' ');
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133 buffer.append(bitrate_string());
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135 String s = buffer.toString();
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140 * Read a 32-bit header from the bitstream.
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142 void read_header(Bitstream stream, Crc16[] crcp) throws BitstreamException {
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144 int channel_bitrate;
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145 boolean sync = false;
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147 headerstring = stream.syncHeader(syncmode);
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148 _headerstring = headerstring; // E.B
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149 if (syncmode == Bitstream.INITIAL_SYNC) {
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150 h_version = ((headerstring >>> 19) & 1);
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151 if (((headerstring >>> 20) & 1) == 0) // SZD: MPEG2.5 detection
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152 if (h_version == MPEG2_LSF)
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153 h_version = MPEG25_LSF;
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155 throw stream.newBitstreamException(Bitstream.UNKNOWN_ERROR);
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156 if ((h_sample_frequency = ((headerstring >>> 10) & 3)) == 3) {
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157 throw stream.newBitstreamException(Bitstream.UNKNOWN_ERROR);
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160 h_layer = 4 - (headerstring >>> 17) & 3;
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161 h_protection_bit = (headerstring >>> 16) & 1;
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162 h_bitrate_index = (headerstring >>> 12) & 0xF;
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163 h_padding_bit = (headerstring >>> 9) & 1;
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164 h_mode = ((headerstring >>> 6) & 3);
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165 h_mode_extension = (headerstring >>> 4) & 3;
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166 if (h_mode == JOINT_STEREO)
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167 h_intensity_stereo_bound = (h_mode_extension << 2) + 4;
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169 h_intensity_stereo_bound = 0; // should never be used
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170 if (((headerstring >>> 3) & 1) == 1)
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171 h_copyright = true;
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172 if (((headerstring >>> 2) & 1) == 1)
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174 // calculate number of subbands:
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176 h_number_of_subbands = 32;
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178 channel_bitrate = h_bitrate_index;
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179 // calculate bitrate per channel:
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180 if (h_mode != SINGLE_CHANNEL)
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181 if (channel_bitrate == 4)
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182 channel_bitrate = 1;
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184 channel_bitrate -= 4;
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185 if ((channel_bitrate == 1) || (channel_bitrate == 2))
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186 if (h_sample_frequency == THIRTYTWO)
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187 h_number_of_subbands = 12;
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189 h_number_of_subbands = 8;
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190 else if ((h_sample_frequency == FOURTYEIGHT)
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191 || ((channel_bitrate >= 3) && (channel_bitrate <= 5)))
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192 h_number_of_subbands = 27;
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194 h_number_of_subbands = 30;
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196 if (h_intensity_stereo_bound > h_number_of_subbands)
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197 h_intensity_stereo_bound = h_number_of_subbands;
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198 // calculate framesize and nSlots
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199 calculate_framesize();
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201 int framesizeloaded = stream.read_frame_data(framesize);
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202 if ((framesize >= 0) && (framesizeloaded != framesize)) {
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203 // Data loaded does not match to expected framesize,
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204 // it might be an ID3v1 TAG. (Fix 11/17/04).
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205 throw stream.newBitstreamException(Bitstream.INVALIDFRAME);
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207 if (stream.isSyncCurrentPosition(syncmode)) {
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208 if (syncmode == Bitstream.INITIAL_SYNC) {
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209 syncmode = Bitstream.STRICT_SYNC;
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210 stream.set_syncword(headerstring & 0xFFF80CC0);
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214 stream.unreadFrame();
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217 stream.parse_frame();
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218 if (h_protection_bit == 0) {
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219 // frame contains a crc checksum
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220 checksum = (short) stream.get_bits(16);
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223 crc.add_bits(headerstring, 16);
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227 if (h_sample_frequency == FOURTYFOUR_POINT_ONE) {
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229 * if (offset == null) { int max = max_number_of_frames(stream); offset =
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230 * new int[max]; for(int i=0; i<max; i++) offset[i] = 0; } // E.B :
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231 * Investigate more int cf = stream.current_frame(); int lf =
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232 * stream.last_frame(); if ((cf > 0) && (cf == lf)) { offset[cf] =
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233 * offset[cf-1] + h_padding_bit; } else { offset[0] = h_padding_bit; }
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239 * Parse frame to extract optionnal VBR frame.
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241 * @param firstframe
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242 * @author E.B (javalayer@javazoom.net)
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244 void parseVBR(byte[] firstframe) throws BitstreamException {
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245 // Trying Xing header.
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246 String xing = "Xing";
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247 byte tmp[] = new byte[4];
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249 // Compute "Xing" offset depending on MPEG version and channels.
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250 if (h_version == MPEG1) {
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251 if (h_mode == SINGLE_CHANNEL)
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256 if (h_mode == SINGLE_CHANNEL)
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262 System.arraycopy(firstframe, offset, tmp, 0, 4);
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264 if (xing.equals(new String(tmp))) {
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270 h_vbr_toc = new byte[100];
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274 byte flags[] = new byte[4];
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275 System.arraycopy(firstframe, offset + length, flags, 0, flags.length);
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276 length += flags.length;
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277 // Read number of frames (if available).
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278 if ((flags[3] & (byte) (1 << 0)) != 0) {
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279 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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281 (tmp[0] << 24) & 0xFF000000 | (tmp[1] << 16) & 0x00FF0000 | (tmp[2] << 8)
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282 & 0x0000FF00 | tmp[3] & 0x000000FF;
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285 // Read size (if available).
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286 if ((flags[3] & (byte) (1 << 1)) != 0) {
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287 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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289 (tmp[0] << 24) & 0xFF000000 | (tmp[1] << 16) & 0x00FF0000 | (tmp[2] << 8)
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290 & 0x0000FF00 | tmp[3] & 0x000000FF;
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293 // Read TOC (if available).
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294 if ((flags[3] & (byte) (1 << 2)) != 0) {
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295 System.arraycopy(firstframe, offset + length, h_vbr_toc, 0, h_vbr_toc.length);
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296 length += h_vbr_toc.length;
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298 // Read scale (if available).
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299 if ((flags[3] & (byte) (1 << 3)) != 0) {
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300 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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302 (tmp[0] << 24) & 0xFF000000 | (tmp[1] << 16) & 0x00FF0000 | (tmp[2] << 8)
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303 & 0x0000FF00 | tmp[3] & 0x000000FF;
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306 // System.out.println("VBR:"+xing+" Frames:"+ h_vbr_frames
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307 // +" Size:"+h_vbr_bytes);
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309 } catch (ArrayIndexOutOfBoundsException e) {
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310 throw new BitstreamException("XingVBRHeader Corrupted", e);
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313 // Trying VBRI header.
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314 String vbri = "VBRI";
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317 System.arraycopy(firstframe, offset, tmp, 0, 4);
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319 if (vbri.equals(new String(tmp))) {
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325 h_vbr_toc = new byte[100];
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327 int length = 4 + 6;
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328 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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330 (tmp[0] << 24) & 0xFF000000 | (tmp[1] << 16) & 0x00FF0000 | (tmp[2] << 8) & 0x0000FF00
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331 | tmp[3] & 0x000000FF;
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334 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
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336 (tmp[0] << 24) & 0xFF000000 | (tmp[1] << 16) & 0x00FF0000 | (tmp[2] << 8) & 0x0000FF00
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337 | tmp[3] & 0x000000FF;
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339 // System.out.println("VBR:"+vbri+" Frames:"+ h_vbr_frames
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340 // +" Size:"+h_vbr_bytes);
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344 } catch (ArrayIndexOutOfBoundsException e) {
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345 throw new BitstreamException("VBRIVBRHeader Corrupted", e);
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349 // Functions to query header contents:
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354 public int version() {
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359 * Returns Layer ID.
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362 public int layer() {
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367 * Returns bitrate index.
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370 public int bitrate_index() {
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371 return h_bitrate_index;
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375 * Returns Sample Frequency.
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377 public int sample_frequency() {
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378 return h_sample_frequency;
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382 * Returns Frequency.
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384 public int frequency() {
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385 return frequencies[h_version][h_sample_frequency];
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392 public int mode() {
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397 * Returns Protection bit.
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399 public boolean checksums() {
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400 if (h_protection_bit == 0)
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407 * Returns Copyright.
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409 public boolean copyright() {
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410 return h_copyright;
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414 * Returns Original.
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416 public boolean original() {
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423 * @return true if VBR header is found
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425 public boolean vbr() {
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430 * Return VBR scale.
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432 * @return scale of -1 if not available
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434 public int vbr_scale() {
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435 return h_vbr_scale;
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441 * @return vbr toc ot null if not available
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443 public byte[] vbr_toc() {
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448 * Returns Checksum flag. Compares computed checksum with stream checksum.
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451 public boolean checksum_ok() {
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452 return (checksum == crc.checksum());
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455 // Seeking and layer III stuff
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457 * Returns Layer III Padding bit.
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459 public boolean padding() {
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460 if (h_padding_bit == 0)
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470 public int slots() {
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475 * Returns Mode Extension.
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478 public int mode_extension() {
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479 return h_mode_extension;
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482 // E.B -> private to public
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484 public static final int bitrates[][][] = {
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486 { 0 /* free format */, 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000,
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487 160000, 176000, 192000, 224000, 256000, 0 },
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488 { 0 /* free format */, 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000,
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489 96000, 112000, 128000, 144000, 160000, 0 },
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490 { 0 /* free format */, 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000,
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491 96000, 112000, 128000, 144000, 160000, 0 } },
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494 { 0 /* free format */, 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000,
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495 288000, 320000, 352000, 384000, 416000, 448000, 0 },
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496 { 0 /* free format */, 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000,
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497 192000, 224000, 256000, 320000, 384000, 0 },
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498 { 0 /* free format */, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000,
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499 160000, 192000, 224000, 256000, 320000, 0 } },
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502 { 0 /* free format */, 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000,
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503 160000, 176000, 192000, 224000, 256000, 0 },
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504 { 0 /* free format */, 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000,
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505 96000, 112000, 128000, 144000, 160000, 0 },
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506 { 0 /* free format */, 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000,
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507 96000, 112000, 128000, 144000, 160000, 0 } },
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511 // E.B -> private to public
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513 * Calculate Frame size. Calculates framesize in bytes excluding header size.
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515 public int calculate_framesize() {
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517 if (h_layer == 1) {
\r
519 (12 * bitrates[h_version][0][h_bitrate_index])
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520 / frequencies[h_version][h_sample_frequency];
\r
521 if (h_padding_bit != 0)
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523 framesize <<= 2; // one slot is 4 bytes long
\r
527 (144 * bitrates[h_version][h_layer - 1][h_bitrate_index])
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528 / frequencies[h_version][h_sample_frequency];
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529 if (h_version == MPEG2_LSF || h_version == MPEG25_LSF)
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530 framesize >>= 1; // SZD
\r
531 if (h_padding_bit != 0)
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534 if (h_layer == 3) {
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535 if (h_version == MPEG1) {
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536 nSlots = framesize - ((h_mode == SINGLE_CHANNEL) ? 17 : 32) // side
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539 - ((h_protection_bit != 0) ? 0 : 2) // CRC size
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540 - 4; // header size
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541 } else { // MPEG-2 LSF, SZD: MPEG-2.5 LSF
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542 nSlots = framesize - ((h_mode == SINGLE_CHANNEL) ? 9 : 17) // side
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545 - ((h_protection_bit != 0) ? 0 : 2) // CRC size
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546 - 4; // header size
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552 framesize -= 4; // subtract header size
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557 * Returns the maximum number of frames in the stream.
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559 * @param streamsize
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560 * @return number of frames
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562 public int max_number_of_frames(int streamsize) // E.B
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565 return h_vbr_frames;
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567 if ((framesize + 4 - h_padding_bit) == 0)
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570 return (streamsize / (framesize + 4 - h_padding_bit));
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575 * Returns the maximum number of frames in the stream.
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577 * @param streamsize
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578 * @return number of frames
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580 public int min_number_of_frames(int streamsize) // E.B
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583 return h_vbr_frames;
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585 if ((framesize + 5 - h_padding_bit) == 0)
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588 return (streamsize / (framesize + 5 - h_padding_bit));
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593 * Returns ms/frame.
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595 * @return milliseconds per frame
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597 public float ms_per_frame() // E.B
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599 if (h_vbr == true) {
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600 double tpf = h_vbr_time_per_frame[layer()] / frequency();
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601 if ((h_version == MPEG2_LSF) || (h_version == MPEG25_LSF))
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603 return ((float) (tpf * 1000));
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605 float ms_per_frame_array[][] =
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606 { { 8.707483f, 8.0f, 12.0f }, { 26.12245f, 24.0f, 36.0f }, { 26.12245f, 24.0f, 36.0f } };
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607 return (ms_per_frame_array[h_layer - 1][h_sample_frequency]);
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612 * Returns total ms.
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614 * @param streamsize
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615 * @return total milliseconds
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617 public float total_ms(int streamsize) // E.B
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619 return (max_number_of_frames(streamsize) * ms_per_frame());
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623 * Returns synchronized header.
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625 public int getSyncHeader() // E.B
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627 return _headerstring;
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630 // functions which return header informations as strings:
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632 * Return Layer version.
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634 public String layer_string() {
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646 // E.B -> private to public
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648 public static final String bitrate_str[][][] = {
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650 { "free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
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651 "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s", "176 kbit/s",
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652 "192 kbit/s", "224 kbit/s", "256 kbit/s", "forbidden" },
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653 { "free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s", "40 kbit/s",
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654 "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s", "96 kbit/s", "112 kbit/s",
\r
655 "128 kbit/s", "144 kbit/s", "160 kbit/s", "forbidden" },
\r
656 { "free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s", "40 kbit/s",
\r
657 "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s", "96 kbit/s", "112 kbit/s",
\r
658 "128 kbit/s", "144 kbit/s", "160 kbit/s", "forbidden" } },
\r
661 { "free format", "32 kbit/s", "64 kbit/s", "96 kbit/s", "128 kbit/s", "160 kbit/s",
\r
662 "192 kbit/s", "224 kbit/s", "256 kbit/s", "288 kbit/s", "320 kbit/s", "352 kbit/s",
\r
663 "384 kbit/s", "416 kbit/s", "448 kbit/s", "forbidden" },
\r
664 { "free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
\r
665 "96 kbit/s", "112 kbit/s", "128 kbit/s", "160 kbit/s", "192 kbit/s", "224 kbit/s",
\r
666 "256 kbit/s", "320 kbit/s", "384 kbit/s", "forbidden" },
\r
667 { "free format", "32 kbit/s", "40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s",
\r
668 "80 kbit/s", "96 kbit/s", "112 kbit/s", "128 kbit/s", "160 kbit/s", "192 kbit/s",
\r
669 "224 kbit/s", "256 kbit/s", "320 kbit/s", "forbidden" } },
\r
672 { "free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
\r
673 "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s", "176 kbit/s",
\r
674 "192 kbit/s", "224 kbit/s", "256 kbit/s", "forbidden" },
\r
675 { "free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s", "40 kbit/s",
\r
676 "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s", "96 kbit/s", "112 kbit/s",
\r
677 "128 kbit/s", "144 kbit/s", "160 kbit/s", "forbidden" },
\r
678 { "free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s", "40 kbit/s",
\r
679 "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s", "96 kbit/s", "112 kbit/s",
\r
680 "128 kbit/s", "144 kbit/s", "160 kbit/s", "forbidden" } }, };
\r
685 * @return bitrate in bps
\r
687 public String bitrate_string() {
\r
688 if (h_vbr == true) {
\r
689 return Integer.toString(bitrate() / 1000) + " kb/s";
\r
691 return bitrate_str[h_version][h_layer - 1][h_bitrate_index];
\r
697 * @return bitrate in bps and average bitrate for VBR header
\r
699 public int bitrate() {
\r
700 if (h_vbr == true) {
\r
701 return ((int) ((h_vbr_bytes * 8) / (ms_per_frame() * h_vbr_frames))) * 1000;
\r
703 return bitrates[h_version][h_layer - 1][h_bitrate_index];
\r
707 * Return Instant Bitrate. Bitrate for VBR is not constant.
\r
709 * @return bitrate in bps
\r
711 public int bitrate_instant() {
\r
712 return bitrates[h_version][h_layer - 1][h_bitrate_index];
\r
716 * Returns Frequency
\r
718 * @return frequency string in kHz
\r
720 public String sample_frequency_string() {
\r
721 switch (h_sample_frequency) {
\r
723 if (h_version == MPEG1)
\r
725 else if (h_version == MPEG2_LSF)
\r
730 case FOURTYFOUR_POINT_ONE:
\r
731 if (h_version == MPEG1)
\r
733 else if (h_version == MPEG2_LSF)
\r
734 return "22.05 kHz";
\r
737 return "11.025 kHz";
\r
739 if (h_version == MPEG1)
\r
741 else if (h_version == MPEG2_LSF)
\r
753 public String mode_string() {
\r
758 return "Joint stereo";
\r
760 return "Dual channel";
\r
761 case SINGLE_CHANNEL:
\r
762 return "Single channel";
\r
770 * @return MPEG-1 or MPEG-2 LSF or MPEG-2.5 LSF
\r
772 public String version_string() {
\r
773 switch (h_version) {
\r
777 return "MPEG-2 LSF";
\r
778 case MPEG25_LSF: // SZD
\r
779 return "MPEG-2.5 LSF";
\r
785 * Returns the number of subbands in the current frame.
\r
787 * @return number of subbands
\r
790 public int number_of_subbands() {
\r
791 return h_number_of_subbands;
\r
795 * Returns Intensity Stereo. (Layer II joint stereo only). Returns the number
\r
796 * of subbands which are in stereo mode, subbands above that limit are in
\r
797 * intensity stereo mode.
\r
799 * @return intensity
\r
802 public int intensity_stereo_bound() {
\r
803 return h_intensity_stereo_bound;
\r