2 * 11/19/04 : 1.0 moved to LGPL.
\r
3 * VBRI header support added, E.B javalayer@javazoom.net
\r
5 * 12/04/03 : VBR (XING) header support added, E.B javalayer@javazoom.net
\r
7 * 02/13/99 : Java Conversion by JavaZOOM , E.B javalayer@javazoom.net
\r
9 * Declarations for MPEG header class
\r
10 * A few layer III, MPEG-2 LSF, and seeking modifications made by Jeff Tsay.
\r
11 * Last modified : 04/19/97
\r
13 * @(#) header.h 1.7, last edit: 6/15/94 16:55:33
\r
14 * @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de)
\r
15 * @(#) Berlin University of Technology
\r
16 *-----------------------------------------------------------------------
\r
17 * This program is free software; you can redistribute it and/or modify
\r
18 * it under the terms of the GNU Library General Public License as published
\r
19 * by the Free Software Foundation; either version 2 of the License, or
\r
20 * (at your option) any later version.
\r
22 * This program is distributed in the hope that it will be useful,
\r
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
\r
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\r
25 * GNU Library General Public License for more details.
\r
27 * You should have received a copy of the GNU Library General Public
\r
28 * License along with this program; if not, write to the Free Software
\r
29 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
\r
30 *----------------------------------------------------------------------
\r
34 * Class for extracting information from a frame header.
\r
36 @LATTICE("HI<HNS,HNS<H,C<H,NS<FS,FS<H,FS<HV,H<SYNC,HV<SYNC,HV<T,SYNC*,HV*,FS*,HI*")
\r
37 @METHODDEFAULT("OUT<V,V<THIS,THIS<SH,SH<IN,SH*,THISLOC=THIS,GLOBALLOC=IN")
\r
38 public final class Header
\r
40 @LOC("T") public static final int[][] frequencies =
\r
41 {{22050, 24000, 16000, 1},
\r
42 {44100, 48000, 32000, 1},
\r
43 {11025, 12000, 8000, 1}}; // SZD: MPEG25
\r
46 * Constant for MPEG-2 LSF version
\r
48 @LOC("T") public static final int MPEG2_LSF = 0;
\r
49 @LOC("T") public static final int MPEG25_LSF = 2; // SZD
\r
52 * Constant for MPEG-1 version
\r
54 @LOC("T") public static final int MPEG1 = 1;
\r
56 @LOC("T") public static final int STEREO = 0;
\r
57 @LOC("T") public static final int JOINT_STEREO = 1;
\r
58 @LOC("T") public static final int DUAL_CHANNEL = 2;
\r
59 @LOC("T") public static final int SINGLE_CHANNEL = 3;
\r
60 @LOC("T") public static final int FOURTYFOUR_POINT_ONE = 0;
\r
61 @LOC("T") public static final int FOURTYEIGHT=1;
\r
62 @LOC("T") public static final int THIRTYTWO=2;
\r
64 @LOC("H") private int h_layer;
\r
65 @LOC("H") private int h_protection_bit;
\r
66 @LOC("H") private int h_bitrate_index;
\r
67 @LOC("H") private int h_padding_bit;
\r
68 @LOC("H") private int h_mode_extension;
\r
69 @LOC("HV") private int h_version;
\r
70 @LOC("H") private int h_mode;
\r
71 @LOC("H") private int h_sample_frequency;
\r
72 @LOC("HNS") private int h_number_of_subbands;
\r
73 @LOC("HI") private int h_intensity_stereo_bound;
\r
74 @LOC("H") private boolean h_copyright;
\r
75 @LOC("H") private boolean h_original;
\r
76 // VBR support added by E.B
\r
77 @LOC("T") private double[] h_vbr_time_per_frame = {-1.0, 384.0, 1152.0, 1152.0};
\r
78 @LOC("T") private boolean h_vbr;
\r
79 @LOC("T") private int h_vbr_frames;
\r
80 @LOC("T") private int h_vbr_scale;
\r
81 @LOC("T") private int h_vbr_bytes;
\r
82 @LOC("T") private byte[] h_vbr_toc;
\r
84 @LOC("SYNC") private byte syncmode = Bitstream.INITIAL_SYNC;
\r
85 @LOC("C") private Crc16 crc;
\r
87 @LOC("C") public short checksum;
\r
88 @LOC("FS") public int framesize;
\r
89 @LOC("NS") public int nSlots;
\r
91 @LOC("T") private int _headerstring = -1; // E.B
\r
96 public String toString()
\r
98 StringBuffer buffer = new StringBuffer(200);
\r
99 buffer.append("Layer ");
\r
100 buffer.append(layer_string());
\r
101 buffer.append(" frame ");
\r
102 buffer.append(mode_string());
\r
103 buffer.append(' ');
\r
104 buffer.append(version_string());
\r
106 buffer.append(" no");
\r
107 buffer.append(" checksums");
\r
108 buffer.append(' ');
\r
109 buffer.append(sample_frequency_string());
\r
110 buffer.append(',');
\r
111 buffer.append(' ');
\r
112 buffer.append(bitrate_string());
\r
114 String s = buffer.toString();
\r
119 * Read a 32-bit header from the bitstream.
\r
121 void read_header(Bitstream stream, Crc16[] crcp) throws BitstreamException
\r
124 int channel_bitrate;
\r
125 boolean sync = false;
\r
128 headerstring = stream.syncHeader(syncmode);
\r
129 _headerstring = headerstring; // E.B
\r
130 if (syncmode == Bitstream.INITIAL_SYNC)
\r
132 h_version = ((headerstring >>> 19) & 1);
\r
133 if (((headerstring >>> 20) & 1) == 0) // SZD: MPEG2.5 detection
\r
134 if (h_version == MPEG2_LSF)
\r
135 h_version = MPEG25_LSF;
\r
137 throw stream.newBitstreamException(Bitstream.UNKNOWN_ERROR);
\r
138 if ((h_sample_frequency = ((headerstring >>> 10) & 3)) == 3)
\r
140 throw stream.newBitstreamException(Bitstream.UNKNOWN_ERROR);
\r
143 h_layer = 4 - (headerstring >>> 17) & 3;
\r
144 h_protection_bit = (headerstring >>> 16) & 1;
\r
145 h_bitrate_index = (headerstring >>> 12) & 0xF;
\r
146 h_padding_bit = (headerstring >>> 9) & 1;
\r
147 h_mode = ((headerstring >>> 6) & 3);
\r
148 h_mode_extension = (headerstring >>> 4) & 3;
\r
149 if (h_mode == JOINT_STEREO)
\r
150 h_intensity_stereo_bound = (h_mode_extension << 2) + 4;
\r
152 h_intensity_stereo_bound = 0; // should never be used
\r
153 if (((headerstring >>> 3) & 1) == 1)
\r
154 h_copyright = true;
\r
155 if (((headerstring >>> 2) & 1) == 1)
\r
157 // calculate number of subbands:
\r
159 h_number_of_subbands = 32;
\r
162 channel_bitrate = h_bitrate_index;
\r
163 // calculate bitrate per channel:
\r
164 if (h_mode != SINGLE_CHANNEL)
\r
165 if (channel_bitrate == 4)
\r
166 channel_bitrate = 1;
\r
168 channel_bitrate -= 4;
\r
169 if ((channel_bitrate == 1) || (channel_bitrate == 2))
\r
170 if (h_sample_frequency == THIRTYTWO)
\r
171 h_number_of_subbands = 12;
\r
173 h_number_of_subbands = 8;
\r
174 else if ((h_sample_frequency == FOURTYEIGHT) || ((channel_bitrate >= 3) && (channel_bitrate <= 5)))
\r
175 h_number_of_subbands = 27;
\r
177 h_number_of_subbands = 30;
\r
179 if (h_intensity_stereo_bound > h_number_of_subbands)
\r
180 h_intensity_stereo_bound = h_number_of_subbands;
\r
181 // calculate framesize and nSlots
\r
182 calculate_framesize();
\r
184 int framesizeloaded = stream.read_frame_data(framesize);
\r
185 if ((framesize >=0) && (framesizeloaded != framesize))
\r
187 // Data loaded does not match to expected framesize,
\r
188 // it might be an ID3v1 TAG. (Fix 11/17/04).
\r
189 throw stream.newBitstreamException(Bitstream.INVALIDFRAME);
\r
191 if (stream.isSyncCurrentPosition(syncmode))
\r
193 if (syncmode == Bitstream.INITIAL_SYNC)
\r
195 syncmode = Bitstream.STRICT_SYNC;
\r
196 stream.set_syncword(headerstring & 0xFFF80CC0);
\r
202 stream.unreadFrame();
\r
206 stream.parse_frame();
\r
207 if (h_protection_bit == 0)
\r
209 // frame contains a crc checksum
\r
210 checksum = (short) stream.get_bits(16);
\r
213 crc.add_bits(headerstring, 16);
\r
218 if (h_sample_frequency == FOURTYFOUR_POINT_ONE)
\r
221 if (offset == null)
\r
223 int max = max_number_of_frames(stream);
\r
224 offset = new int[max];
\r
225 for(int i=0; i<max; i++) offset[i] = 0;
\r
227 // E.B : Investigate more
\r
228 int cf = stream.current_frame();
\r
229 int lf = stream.last_frame();
\r
230 if ((cf > 0) && (cf == lf))
\r
232 offset[cf] = offset[cf-1] + h_padding_bit;
\r
236 offset[0] = h_padding_bit;
\r
243 * Parse frame to extract optionnal VBR frame.
\r
244 * @param firstframe
\r
245 * @author E.B (javalayer@javazoom.net)
\r
247 void parseVBR(byte[] firstframe) throws BitstreamException
\r
249 // Trying Xing header.
\r
250 String xing = "Xing";
\r
251 byte tmp[] = new byte[4];
\r
253 // Compute "Xing" offset depending on MPEG version and channels.
\r
254 if (h_version == MPEG1)
\r
256 if (h_mode == SINGLE_CHANNEL) offset=21-4;
\r
261 if (h_mode == SINGLE_CHANNEL) offset=13-4;
\r
262 else offset = 21-4;
\r
266 System.arraycopy(firstframe, offset, tmp, 0, 4);
\r
268 if (xing.equals(new String(tmp)))
\r
275 h_vbr_toc = new byte[100];
\r
279 byte flags[] = new byte[4];
\r
280 System.arraycopy(firstframe, offset + length, flags, 0, flags.length);
\r
281 length += flags.length;
\r
282 // Read number of frames (if available).
\r
283 if ((flags[3] & (byte) (1 << 0)) != 0)
\r
285 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
\r
286 h_vbr_frames = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
\r
289 // Read size (if available).
\r
290 if ((flags[3] & (byte) (1 << 1)) != 0)
\r
292 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
\r
293 h_vbr_bytes = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
\r
296 // Read TOC (if available).
\r
297 if ((flags[3] & (byte) (1 << 2)) != 0)
\r
299 System.arraycopy(firstframe, offset + length, h_vbr_toc, 0, h_vbr_toc.length);
\r
300 length += h_vbr_toc.length;
\r
302 // Read scale (if available).
\r
303 if ((flags[3] & (byte) (1 << 3)) != 0)
\r
305 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
\r
306 h_vbr_scale = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
\r
309 //System.out.println("VBR:"+xing+" Frames:"+ h_vbr_frames +" Size:"+h_vbr_bytes);
\r
312 catch (ArrayIndexOutOfBoundsException e)
\r
314 throw new BitstreamException("XingVBRHeader Corrupted",e);
\r
317 // Trying VBRI header.
\r
318 String vbri = "VBRI";
\r
322 System.arraycopy(firstframe, offset, tmp, 0, 4);
\r
324 if (vbri.equals(new String(tmp)))
\r
331 h_vbr_toc = new byte[100];
\r
333 int length = 4 + 6;
\r
334 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
\r
335 h_vbr_bytes = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
\r
338 System.arraycopy(firstframe, offset + length, tmp, 0, tmp.length);
\r
339 h_vbr_frames = (tmp[0] << 24)&0xFF000000 | (tmp[1] << 16)&0x00FF0000 | (tmp[2] << 8)&0x0000FF00 | tmp[3]&0x000000FF;
\r
341 //System.out.println("VBR:"+vbri+" Frames:"+ h_vbr_frames +" Size:"+h_vbr_bytes);
\r
346 catch (ArrayIndexOutOfBoundsException e)
\r
348 throw new BitstreamException("VBRIVBRHeader Corrupted",e);
\r
352 // Functions to query header contents:
\r
356 public int version() { return h_version; }
\r
359 * Returns Layer ID.
\r
362 public int layer() { return h_layer; }
\r
365 * Returns bitrate index.
\r
367 public int bitrate_index() { return h_bitrate_index; }
\r
370 * Returns Sample Frequency.
\r
372 public int sample_frequency() { return h_sample_frequency; }
\r
375 * Returns Frequency.
\r
377 public int frequency() {return frequencies[h_version][h_sample_frequency];}
\r
382 public int mode() { return h_mode; }
\r
385 * Returns Protection bit.
\r
387 public boolean checksums()
\r
389 if (h_protection_bit == 0) return true;
\r
394 * Returns Copyright.
\r
396 public boolean copyright() { return h_copyright; }
\r
399 * Returns Original.
\r
401 public boolean original() { return h_original; }
\r
405 * @return true if VBR header is found
\r
407 public boolean vbr() { return h_vbr; }
\r
410 * Return VBR scale.
\r
411 * @return scale of -1 if not available
\r
413 public int vbr_scale() { return h_vbr_scale; }
\r
417 * @return vbr toc ot null if not available
\r
419 public byte[] vbr_toc() { return h_vbr_toc; }
\r
422 * Returns Checksum flag.
\r
423 * Compares computed checksum with stream checksum.
\r
425 public boolean checksum_ok () { return (checksum == crc.checksum()); }
\r
427 // Seeking and layer III stuff
\r
429 * Returns Layer III Padding bit.
\r
431 public boolean padding()
\r
433 if (h_padding_bit == 0) return false;
\r
440 public int slots() { return nSlots; }
\r
443 * Returns Mode Extension.
\r
445 public int mode_extension() { return h_mode_extension; }
\r
447 // E.B -> private to public
\r
448 @LOC("T") public static final int bitrates[][][] = {
\r
449 {{0 /*free format*/, 32000, 48000, 56000, 64000, 80000, 96000,
\r
450 112000, 128000, 144000, 160000, 176000, 192000 ,224000, 256000, 0},
\r
451 {0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
\r
452 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0},
\r
453 {0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
\r
454 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0}},
\r
456 {{0 /*free format*/, 32000, 64000, 96000, 128000, 160000, 192000,
\r
457 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000, 0},
\r
458 {0 /*free format*/, 32000, 48000, 56000, 64000, 80000, 96000,
\r
459 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000, 0},
\r
460 {0 /*free format*/, 32000, 40000, 48000, 56000, 64000, 80000,
\r
461 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 0}},
\r
463 {{0 /*free format*/, 32000, 48000, 56000, 64000, 80000, 96000,
\r
464 112000, 128000, 144000, 160000, 176000, 192000 ,224000, 256000, 0},
\r
465 {0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
\r
466 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0},
\r
467 {0 /*free format*/, 8000, 16000, 24000, 32000, 40000, 48000,
\r
468 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 0}},
\r
472 // E.B -> private to public
\r
474 * Calculate Frame size.
\r
475 * Calculates framesize in bytes excluding header size.
\r
477 public int calculate_framesize()
\r
482 framesize = (12 * bitrates[h_version][0][h_bitrate_index]) /
\r
483 frequencies[h_version][h_sample_frequency];
\r
484 if (h_padding_bit != 0 ) framesize++;
\r
485 framesize <<= 2; // one slot is 4 bytes long
\r
490 framesize = (144 * bitrates[h_version][h_layer - 1][h_bitrate_index]) /
\r
491 frequencies[h_version][h_sample_frequency];
\r
492 if (h_version == MPEG2_LSF || h_version == MPEG25_LSF) framesize >>= 1; // SZD
\r
493 if (h_padding_bit != 0) framesize++;
\r
497 if (h_version == MPEG1)
\r
499 nSlots = framesize - ((h_mode == SINGLE_CHANNEL) ? 17 : 32) // side info size
\r
500 - ((h_protection_bit!=0) ? 0 : 2) // CRC size
\r
501 - 4; // header size
\r
504 { // MPEG-2 LSF, SZD: MPEG-2.5 LSF
\r
505 nSlots = framesize - ((h_mode == SINGLE_CHANNEL) ? 9 : 17) // side info size
\r
506 - ((h_protection_bit!=0) ? 0 : 2) // CRC size
\r
507 - 4; // header size
\r
515 framesize -= 4; // subtract header size
\r
520 * Returns the maximum number of frames in the stream.
\r
521 * @param streamsize
\r
522 * @return number of frames
\r
524 public int max_number_of_frames(int streamsize) // E.B
\r
526 if (h_vbr == true) return h_vbr_frames;
\r
529 if ((framesize + 4 - h_padding_bit) == 0) return 0;
\r
530 else return(streamsize / (framesize + 4 - h_padding_bit));
\r
535 * Returns the maximum number of frames in the stream.
\r
536 * @param streamsize
\r
537 * @return number of frames
\r
539 public int min_number_of_frames(int streamsize) // E.B
\r
541 if (h_vbr == true) return h_vbr_frames;
\r
544 if ((framesize + 5 - h_padding_bit) == 0) return 0;
\r
545 else return(streamsize / (framesize + 5 - h_padding_bit));
\r
551 * Returns ms/frame.
\r
552 * @return milliseconds per frame
\r
554 public float ms_per_frame() // E.B
\r
558 double tpf = h_vbr_time_per_frame[layer()] / frequency();
\r
559 if ((h_version == MPEG2_LSF) || (h_version == MPEG25_LSF)) tpf /= 2;
\r
560 return ((float) (tpf * 1000));
\r
564 float ms_per_frame_array[][] = {{8.707483f, 8.0f, 12.0f},
\r
565 {26.12245f, 24.0f, 36.0f},
\r
566 {26.12245f, 24.0f, 36.0f}};
\r
567 return(ms_per_frame_array[h_layer-1][h_sample_frequency]);
\r
572 * Returns total ms.
\r
573 * @param streamsize
\r
574 * @return total milliseconds
\r
576 public float total_ms(int streamsize) // E.B
\r
578 return(max_number_of_frames(streamsize) * ms_per_frame());
\r
582 * Returns synchronized header.
\r
584 public int getSyncHeader() // E.B
\r
586 return _headerstring;
\r
589 // functions which return header informations as strings:
\r
591 * Return Layer version.
\r
593 public String layer_string()
\r
607 // E.B -> private to public
\r
608 @LOC("T") public static final String bitrate_str[][][] = {
\r
609 {{"free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s",
\r
610 "80 kbit/s", "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s",
\r
611 "160 kbit/s", "176 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s",
\r
613 {"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
\r
614 "40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
\r
615 "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
\r
617 {"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
\r
618 "40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
\r
619 "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
\r
622 {{"free format", "32 kbit/s", "64 kbit/s", "96 kbit/s", "128 kbit/s",
\r
623 "160 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s", "288 kbit/s",
\r
624 "320 kbit/s", "352 kbit/s", "384 kbit/s", "416 kbit/s", "448 kbit/s",
\r
626 {"free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s",
\r
627 "80 kbit/s", "96 kbit/s", "112 kbit/s", "128 kbit/s", "160 kbit/s",
\r
628 "192 kbit/s", "224 kbit/s", "256 kbit/s", "320 kbit/s", "384 kbit/s",
\r
630 {"free format", "32 kbit/s", "40 kbit/s", "48 kbit/s", "56 kbit/s",
\r
631 "64 kbit/s", "80 kbit/s" , "96 kbit/s", "112 kbit/s", "128 kbit/s",
\r
632 "160 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s", "320 kbit/s",
\r
635 {{"free format", "32 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s",
\r
636 "80 kbit/s", "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s",
\r
637 "160 kbit/s", "176 kbit/s", "192 kbit/s", "224 kbit/s", "256 kbit/s",
\r
639 {"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
\r
640 "40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
\r
641 "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
\r
643 {"free format", "8 kbit/s", "16 kbit/s", "24 kbit/s", "32 kbit/s",
\r
644 "40 kbit/s", "48 kbit/s", "56 kbit/s", "64 kbit/s", "80 kbit/s",
\r
645 "96 kbit/s", "112 kbit/s", "128 kbit/s", "144 kbit/s", "160 kbit/s",
\r
651 * @return bitrate in bps
\r
653 public String bitrate_string()
\r
657 return Integer.toString(bitrate()/1000)+" kb/s";
\r
659 else return bitrate_str[h_version][h_layer - 1][h_bitrate_index];
\r
664 * @return bitrate in bps and average bitrate for VBR header
\r
666 public int bitrate()
\r
670 return ((int) ((h_vbr_bytes * 8) / (ms_per_frame() * h_vbr_frames)))*1000;
\r
672 else return bitrates[h_version][h_layer - 1][h_bitrate_index];
\r
676 * Return Instant Bitrate.
\r
677 * Bitrate for VBR is not constant.
\r
678 * @return bitrate in bps
\r
680 public int bitrate_instant()
\r
682 return bitrates[h_version][h_layer - 1][h_bitrate_index];
\r
686 * Returns Frequency
\r
687 * @return frequency string in kHz
\r
689 public String sample_frequency_string()
\r
691 switch (h_sample_frequency)
\r
694 if (h_version == MPEG1)
\r
696 else if (h_version == MPEG2_LSF)
\r
700 case FOURTYFOUR_POINT_ONE:
\r
701 if (h_version == MPEG1)
\r
703 else if (h_version == MPEG2_LSF)
\r
704 return "22.05 kHz";
\r
706 return "11.025 kHz";
\r
708 if (h_version == MPEG1)
\r
710 else if (h_version == MPEG2_LSF)
\r
721 public String mode_string()
\r
728 return "Joint stereo";
\r
730 return "Dual channel";
\r
731 case SINGLE_CHANNEL:
\r
732 return "Single channel";
\r
739 * @return MPEG-1 or MPEG-2 LSF or MPEG-2.5 LSF
\r
741 public String version_string()
\r
748 return "MPEG-2 LSF";
\r
749 case MPEG25_LSF: // SZD
\r
750 return "MPEG-2.5 LSF";
\r
756 * Returns the number of subbands in the current frame.
\r
757 * @return number of subbands
\r
759 public int number_of_subbands() {return h_number_of_subbands;}
\r
762 * Returns Intensity Stereo.
\r
763 * (Layer II joint stereo only).
\r
764 * Returns the number of subbands which are in stereo mode,
\r
765 * subbands above that limit are in intensity stereo mode.
\r
766 * @return intensity
\r
768 public int intensity_stereo_bound() {return h_intensity_stereo_bound;}
\r