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SubBand2.pas
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SubBand2.pas
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(*
* File: $RCSfile: SubBand2.pas,v $
* Revision: $Revision: 1.1.1.1 $
* Version : $Id: SubBand2.pas,v 1.1.1.1 2002/04/21 12:57:23 fobmagog Exp $
* Author: $Author: fobmagog $
* Homepage: http://delphimpeg.sourceforge.net/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*)
unit SubBand2;
interface
uses
Windows, SysUtils, Shared, BitStream, SubBand, Header, CRC, SynthFilter;
type
// class for layer II subbands in single channel mode:
TSubBandLayer2 = class(TSubBand)
protected
FSubBandNumber: Cardinal;
FAllocation: Cardinal;
FSCFSI: Cardinal;
FScaleFactor1, FScaleFactor2, FScaleFactor3: Single;
FCodeLength: Cardinal;
FGroupingTable: PSingleArray;
FFactor: Single;
FGroupNumber: Cardinal;
FSampleNumber: Cardinal;
FSamples: array[0..2] of Single;
FC, FD: Single;
function GetAllocationLength(Header: THeader): Cardinal; virtual;
procedure PrepareSampleReading(Header: THeader; Allocation: Cardinal;
var GroupingTable: PSingleArray; var Factor: Single; var CodeLength: Cardinal;
var C, D: Single); virtual;
public
constructor Create(SubBandNumber: Cardinal); virtual;
procedure ReadAllocation(Stream: TBitStream; Header: THeader; CRC: TCRC16); override;
procedure ReadScaleFactorSelection(Stream: TBitStream; CRC: TCRC16); virtual;
procedure ReadScaleFactor(Stream: TBitStream; Header: THeader); override;
function ReadSampleData(Stream: TBitStream): boolean; override;
function PutNextSample(Channels: TChannels; Filter1, Filter2: TSynthesisFilter): boolean; override;
end;
// class for layer II subbands in joint stereo mode:
TSubbandLayer2IntensityStereo = class(TSubbandLayer2)
protected
FChannel2SCFSI: Cardinal;
FChannel2ScaleFactor1: Single;
FChannel2ScaleFactor2: Single;
FChannel2ScaleFactor3: Single;
public
procedure ReadScaleFactorSelection(Stream: TBitStream; CRC: TCRC16); override;
procedure ReadScaleFactor(Stream: TBitStream; Header: THeader); override;
function PutNextSample(Channels: TChannels; Filter1, Filter2: TSynthesisFilter): boolean; override;
end;
// class for layer II subbands in stereo mode:
TSubbandLayer2Stereo = class(TSubbandLayer2)
protected
FChannel2Allocation: Cardinal;
FChannel2SCFSI: Cardinal;
FChannel2ScaleFactor1: Single;
FChannel2ScaleFactor2: Single;
FChannel2ScaleFactor3: Single;
FChannel2Grouping: Boolean;
FChannel2CodeLength: Cardinal;
FChannel2GroupingTable: PSingleArray;
FChannel2Factor: Single;
FChannel2Samples: array[0..2] of Single;
FChannel2C, FChannel2D: Single;
public
procedure ReadAllocation(Stream: TBitStream; Header: THeader; CRC: TCRC16); override;
procedure ReadScaleFactorSelection(Stream: TBitStream; CRC: TCRC16); override;
procedure ReadScaleFactor(Stream: TBitStream; Header: THeader); override;
function ReadSampleData(Stream: TBitStream): boolean; override;
function PutNextSample(Channels: TChannels; Filter1, Filter2: TSynthesisFilter): boolean; override;
end;
implementation
uses
ScaleFac;
const
// this table contains 3 requantized samples for each legal codeword
// when grouped in 5 bits, i.e. 3 quantizationsteps per sample
Grouping5Bits: array[0..27*3-1] of Single = (
-2.0/3.0, -2.0/3.0, -2.0/3.0,
0.0, -2.0/3.0, -2.0/3.0,
2.0/3.0, -2.0/3.0, -2.0/3.0,
-2.0/3.0, 0.0, -2.0/3.0,
0.0, 0.0, -2.0/3.0,
2.0/3.0, 0.0, -2.0/3.0,
-2.0/3.0, 2.0/3.0, -2.0/3.0,
0.0, 2.0/3.0, -2.0/3.0,
2.0/3.0, 2.0/3.0, -2.0/3.0,
-2.0/3.0, -2.0/3.0, 0.0,
0.0, -2.0/3.0, 0.0,
2.0/3.0, -2.0/3.0, 0.0,
-2.0/3.0, 0.0, 0.0,
0.0, 0.0, 0.0,
2.0/3.0, 0.0, 0.0,
-2.0/3.0, 2.0/3.0, 0.0,
0.0, 2.0/3.0, 0.0,
2.0/3.0, 2.0/3.0, 0.0,
-2.0/3.0, -2.0/3.0, 2.0/3.0,
0.0, -2.0/3.0, 2.0/3.0,
2.0/3.0, -2.0/3.0, 2.0/3.0,
-2.0/3.0, 0.0, 2.0/3.0,
0.0, 0.0, 2.0/3.0,
2.0/3.0, 0.0, 2.0/3.0,
-2.0/3.0, 2.0/3.0, 2.0/3.0,
0.0, 2.0/3.0, 2.0/3.0,
2.0/3.0, 2.0/3.0, 2.0/3.0);
// this table contains 3 requantized samples for each legal codeword
// when grouped in 7 bits, i.e. 5 quantizationsteps per sample
Grouping7Bits: array[0..125*3-1] of Single = (
-0.8, -0.8, -0.8, -0.4, -0.8, -0.8, 0.0, -0.8, -0.8, 0.4, -0.8, -0.8, 0.8, -0.8, -0.8,
-0.8, -0.4, -0.8, -0.4, -0.4, -0.8, 0.0, -0.4, -0.8, 0.4, -0.4, -0.8, 0.8, -0.4, -0.8,
-0.8, 0.0, -0.8, -0.4, 0.0, -0.8, 0.0, 0.0, -0.8, 0.4, 0.0, -0.8, 0.8, 0.0, -0.8,
-0.8, 0.4, -0.8, -0.4, 0.4, -0.8, 0.0, 0.4, -0.8, 0.4, 0.4, -0.8, 0.8, 0.4, -0.8,
-0.8, 0.8, -0.8, -0.4, 0.8, -0.8, 0.0, 0.8, -0.8, 0.4, 0.8, -0.8, 0.8, 0.8, -0.8,
-0.8, -0.8, -0.4, -0.4, -0.8, -0.4, 0.0, -0.8, -0.4, 0.4, -0.8, -0.4, 0.8, -0.8, -0.4,
-0.8, -0.4, -0.4, -0.4, -0.4, -0.4, 0.0, -0.4, -0.4, 0.4, -0.4, -0.4, 0.8, -0.4, -0.4,
-0.8, 0.0, -0.4, -0.4, 0.0, -0.4, 0.0, 0.0, -0.4, 0.4, 0.0, -0.4, 0.8, 0.0, -0.4,
-0.8, 0.4, -0.4, -0.4, 0.4, -0.4, 0.0, 0.4, -0.4, 0.4, 0.4, -0.4, 0.8, 0.4, -0.4,
-0.8, 0.8, -0.4, -0.4, 0.8, -0.4, 0.0, 0.8, -0.4, 0.4, 0.8, -0.4, 0.8, 0.8, -0.4,
-0.8, -0.8, 0.0, -0.4, -0.8, 0.0, 0.0, -0.8, 0.0, 0.4, -0.8, 0.0, 0.8, -0.8, 0.0,
-0.8, -0.4, 0.0, -0.4, -0.4, 0.0, 0.0, -0.4, 0.0, 0.4, -0.4, 0.0, 0.8, -0.4, 0.0,
-0.8, 0.0, 0.0, -0.4, 0.0, 0.0, 0.0, 0.0, 0.0, 0.4, 0.0, 0.0, 0.8, 0.0, 0.0,
-0.8, 0.4, 0.0, -0.4, 0.4, 0.0, 0.0, 0.4, 0.0, 0.4, 0.4, 0.0, 0.8, 0.4, 0.0,
-0.8, 0.8, 0.0, -0.4, 0.8, 0.0, 0.0, 0.8, 0.0, 0.4, 0.8, 0.0, 0.8, 0.8, 0.0,
-0.8, -0.8, 0.4, -0.4, -0.8, 0.4, 0.0, -0.8, 0.4, 0.4, -0.8, 0.4, 0.8, -0.8, 0.4,
-0.8, -0.4, 0.4, -0.4, -0.4, 0.4, 0.0, -0.4, 0.4, 0.4, -0.4, 0.4, 0.8, -0.4, 0.4,
-0.8, 0.0, 0.4, -0.4, 0.0, 0.4, 0.0, 0.0, 0.4, 0.4, 0.0, 0.4, 0.8, 0.0, 0.4,
-0.8, 0.4, 0.4, -0.4, 0.4, 0.4, 0.0, 0.4, 0.4, 0.4, 0.4, 0.4, 0.8, 0.4, 0.4,
-0.8, 0.8, 0.4, -0.4, 0.8, 0.4, 0.0, 0.8, 0.4, 0.4, 0.8, 0.4, 0.8, 0.8, 0.4,
-0.8, -0.8, 0.8, -0.4, -0.8, 0.8, 0.0, -0.8, 0.8, 0.4, -0.8, 0.8, 0.8, -0.8, 0.8,
-0.8, -0.4, 0.8, -0.4, -0.4, 0.8, 0.0, -0.4, 0.8, 0.4, -0.4, 0.8, 0.8, -0.4, 0.8,
-0.8, 0.0, 0.8, -0.4, 0.0, 0.8, 0.0, 0.0, 0.8, 0.4, 0.0, 0.8, 0.8, 0.0, 0.8,
-0.8, 0.4, 0.8, -0.4, 0.4, 0.8, 0.0, 0.4, 0.8, 0.4, 0.4, 0.8, 0.8, 0.4, 0.8,
-0.8, 0.8, 0.8, -0.4, 0.8, 0.8, 0.0, 0.8, 0.8, 0.4, 0.8, 0.8, 0.8, 0.8, 0.8);
// this table contains 3 requantized samples for each legal codeword
// when grouped in 10 bits, i.e. 9 quantizationsteps per sample
Grouping10Bits: array[0..729*3-1] of Single = (
-8.0/9.0, -8.0/9.0, -8.0/9.0, -6.0/9.0, -8.0/9.0, -8.0/9.0, -4.0/9.0, -8.0/9.0, -8.0/9.0,
-2.0/9.0, -8.0/9.0, -8.0/9.0, 0.0, -8.0/9.0, -8.0/9.0, 2.0/9.0, -8.0/9.0, -8.0/9.0,
4.0/9.0, -8.0/9.0, -8.0/9.0, 6.0/9.0, -8.0/9.0, -8.0/9.0, 8.0/9.0, -8.0/9.0, -8.0/9.0,
-8.0/9.0, -6.0/9.0, -8.0/9.0, -6.0/9.0, -6.0/9.0, -8.0/9.0, -4.0/9.0, -6.0/9.0, -8.0/9.0,
-2.0/9.0, -6.0/9.0, -8.0/9.0, 0.0, -6.0/9.0, -8.0/9.0, 2.0/9.0, -6.0/9.0, -8.0/9.0,
4.0/9.0, -6.0/9.0, -8.0/9.0, 6.0/9.0, -6.0/9.0, -8.0/9.0, 8.0/9.0, -6.0/9.0, -8.0/9.0,
-8.0/9.0, -4.0/9.0, -8.0/9.0, -6.0/9.0, -4.0/9.0, -8.0/9.0, -4.0/9.0, -4.0/9.0, -8.0/9.0,
-2.0/9.0, -4.0/9.0, -8.0/9.0, 0.0, -4.0/9.0, -8.0/9.0, 2.0/9.0, -4.0/9.0, -8.0/9.0,
4.0/9.0, -4.0/9.0, -8.0/9.0, 6.0/9.0, -4.0/9.0, -8.0/9.0, 8.0/9.0, -4.0/9.0, -8.0/9.0,
-8.0/9.0, -2.0/9.0, -8.0/9.0, -6.0/9.0, -2.0/9.0, -8.0/9.0, -4.0/9.0, -2.0/9.0, -8.0/9.0,
-2.0/9.0, -2.0/9.0, -8.0/9.0, 0.0, -2.0/9.0, -8.0/9.0, 2.0/9.0, -2.0/9.0, -8.0/9.0,
4.0/9.0, -2.0/9.0, -8.0/9.0, 6.0/9.0, -2.0/9.0, -8.0/9.0, 8.0/9.0, -2.0/9.0, -8.0/9.0,
-8.0/9.0, 0.0, -8.0/9.0, -6.0/9.0, 0.0, -8.0/9.0, -4.0/9.0, 0.0, -8.0/9.0,
-2.0/9.0, 0.0, -8.0/9.0, 0.0, 0.0, -8.0/9.0, 2.0/9.0, 0.0, -8.0/9.0,
4.0/9.0, 0.0, -8.0/9.0, 6.0/9.0, 0.0, -8.0/9.0, 8.0/9.0, 0.0, -8.0/9.0,
-8.0/9.0, 2.0/9.0, -8.0/9.0, -6.0/9.0, 2.0/9.0, -8.0/9.0, -4.0/9.0, 2.0/9.0, -8.0/9.0,
-2.0/9.0, 2.0/9.0, -8.0/9.0, 0.0, 2.0/9.0, -8.0/9.0, 2.0/9.0, 2.0/9.0, -8.0/9.0,
4.0/9.0, 2.0/9.0, -8.0/9.0, 6.0/9.0, 2.0/9.0, -8.0/9.0, 8.0/9.0, 2.0/9.0, -8.0/9.0,
-8.0/9.0, 4.0/9.0, -8.0/9.0, -6.0/9.0, 4.0/9.0, -8.0/9.0, -4.0/9.0, 4.0/9.0, -8.0/9.0,
-2.0/9.0, 4.0/9.0, -8.0/9.0, 0.0, 4.0/9.0, -8.0/9.0, 2.0/9.0, 4.0/9.0, -8.0/9.0,
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4.0/9.0, 4.0/9.0, 8.0/9.0, 6.0/9.0, 4.0/9.0, 8.0/9.0, 8.0/9.0, 4.0/9.0, 8.0/9.0,
-8.0/9.0, 6.0/9.0, 8.0/9.0, -6.0/9.0, 6.0/9.0, 8.0/9.0, -4.0/9.0, 6.0/9.0, 8.0/9.0,
-2.0/9.0, 6.0/9.0, 8.0/9.0, 0.0, 6.0/9.0, 8.0/9.0, 2.0/9.0, 6.0/9.0, 8.0/9.0,
4.0/9.0, 6.0/9.0, 8.0/9.0, 6.0/9.0, 6.0/9.0, 8.0/9.0, 8.0/9.0, 6.0/9.0, 8.0/9.0,
-8.0/9.0, 8.0/9.0, 8.0/9.0, -6.0/9.0, 8.0/9.0, 8.0/9.0, -4.0/9.0, 8.0/9.0, 8.0/9.0,
-2.0/9.0, 8.0/9.0, 8.0/9.0, 0.0, 8.0/9.0, 8.0/9.0, 2.0/9.0, 8.0/9.0, 8.0/9.0,
4.0/9.0, 8.0/9.0, 8.0/9.0, 6.0/9.0, 8.0/9.0, 8.0/9.0, 8.0/9.0, 8.0/9.0, 8.0/9.0);
// data taken from ISO/IEC DIS 11172, Annexes 3-B.2[abcd] and 3-B.4:
// subbands 0-2 in tables 3-B.2a and 2b: (index is allocation)
// bits per codeword
TableAB1CodeLength: array[0..15] of Cardinal = (
0, 5, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
// pointer to sample grouping table, or NULL-pointer if ungrouped
TableAB1GroupingTables: array[0..15] of PSingleArray = (
nil, @Grouping5bits, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil);
// factor for requantization: (real)sample * factor - 1.0 gives requantized sample
TableAB1Factor: array[0..15] of Single = (
0.0, 1.0/2.0, 1.0/4.0, 1.0/8.0, 1.0/16.0, 1.0/32.0, 1.0/64.0,
1.0/128.0, 1.0/256.0, 1.0/512.0, 1.0/1024.0, 1.0/2048.0,
1.0/4096.0, 1.0/8192.0, 1.0/16384.0, 1.0/32768.0);
// factor c for requantization from table 3-B.4
TableAB1C: array[0..15] of Single = (
0.0, 1.33333333333, 1.14285714286, 1.06666666666, 1.03225806452,
1.01587301587, 1.00787401575, 1.00392156863, 1.00195694716, 1.00097751711,
1.00048851979, 1.00024420024, 1.00012208522, 1.00006103888, 1.00003051851,
1.00001525902);
// addend d for requantization from table 3-B.4
TableAB1D: array[0..15] of Single = (
0.0, 0.50000000000, 0.25000000000, 0.12500000000, 0.06250000000,
0.03125000000, 0.01562500000, 0.00781250000, 0.00390625000, 0.00195312500,
0.00097656250, 0.00048828125, 0.00024414063, 0.00012207031, 0.00006103516,
0.00003051758);
// subbands 3-... tables 3-B.2a and 2b:
TableAB234GroupingTables: array[0..15] of PSingleArray = (
nil, @Grouping5Bits, @Grouping7Bits, nil, @Grouping10Bits, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil, nil);
// subbands 3-10 in tables 3-B.2a and 2b:
TableAB2CodeLength: array[0..15] of Cardinal = (
0, 5, 7, 3, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16);
TableAB2Factor: array[0..15] of Single = (
0.0, 1.0/2.0, 1.0/4.0, 1.0/4.0, 1.0/8.0, 1.0/8.0, 1.0/16.0,
1.0/32.0, 1.0/64.0, 1.0/128.0, 1.0/256.0, 1.0/512.0,
1.0/1024.0, 1.0/2048.0, 1.0/4096.0, 1.0/32768.0);
TableAB2C: array[0..15] of Single = (
0.0, 1.33333333333, 1.60000000000, 1.14285714286, 1.77777777777,
1.06666666666, 1.03225806452, 1.01587301587, 1.00787401575, 1.00392156863,
1.00195694716, 1.00097751711, 1.00048851979, 1.00024420024, 1.00012208522,
1.00001525902);
TableAB2D: array[0..15] of Single = (
0.0, 0.50000000000, 0.50000000000, 0.25000000000, 0.50000000000,
0.12500000000, 0.06250000000, 0.03125000000, 0.01562500000, 0.00781250000,
0.00390625000, 0.00195312500, 0.00097656250, 0.00048828125, 0.00024414063,
0.00003051758);
// subbands 11-22 in tables 3-B.2a and 2b:
TableAB3CodeLength: array[0..7] of Cardinal = (
0, 5, 7, 3, 10, 4, 5, 16);
TableAB3Factor: array[0..7] of Single = (
0.0, 1.0/2.0, 1.0/4.0, 1.0/4.0, 1.0/8.0, 1.0/8.0, 1.0/16.0, 1.0/32768.0);
TableAB3C: array[0..7] of Single = (
0.0, 1.33333333333, 1.60000000000, 1.14285714286, 1.77777777777,
1.06666666666, 1.03225806452, 1.00001525902);
TableAB3D: array[0..7] of Single = (
0.0, 0.50000000000, 0.50000000000, 0.25000000000, 0.50000000000,
0.12500000000, 0.06250000000, 0.00003051758);
// subbands 23-... in tables 3-B.2a and 2b:
TableAB4CodeLength: array[0..3] of Cardinal = (
0, 5, 7, 16);
TableAB4Factor: array[0..3] of Single = (
0.0, 1.0/2.0, 1.0/4.0, 1.0/32768.0);
TableAB4C: array[0..3] of Single = (
0.0, 1.33333333333, 1.60000000000, 1.00001525902);
TableAB4D: array[0..3] of Single = (
0.0, 0.50000000000, 0.50000000000, 0.00003051758);
// subbands in tables 3-B.2c and 2d:
TableCDCodeLength: array[0..15] of Cardinal = (
0, 5, 7, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
TableCDGroupingTables: array[0..15] of PSingleArray = (
nil, @Grouping5Bits, @Grouping7Bits, @Grouping10Bits, nil, nil, nil, nil,
nil, nil, nil, nil, nil, nil, nil, nil);
TableCDFactor: array[0..15] of Single = (
0.0, 1.0/2.0, 1.0/4.0, 1.0/8.0, 1.0/8.0, 1.0/16.0, 1.0/32.0, 1.0/64.0,
1.0/128.0, 1.0/256.0, 1.0/512.0, 1.0/1024.0, 1.0/2048.0, 1.0/4096.0,
1.0/8192.0, 1.0/16384.0);
TableCDC: array[0..15] of Single = (
0.0, 1.33333333333, 1.60000000000, 1.77777777777, 1.06666666666,
1.03225806452, 1.01587301587, 1.00787401575, 1.00392156863, 1.00195694716,
1.00097751711, 1.00048851979, 1.00024420024, 1.00012208522, 1.00006103888,
1.00003051851);
TableCDD: array[0..15] of Single = (
0.0, 0.50000000000, 0.50000000000, 0.50000000000, 0.12500000000,
0.06250000000, 0.03125000000, 0.01562500000, 0.00781250000, 0.00390625000,
0.00195312500, 0.00097656250, 0.00048828125, 0.00024414063, 0.00012207031,
0.00006103516);
{ TSubBandLayer2 }
constructor TSubBandLayer2.Create(SubBandNumber: Cardinal);
begin
FSubBandNumber := SubBandNumber;
FGroupNumber := 0;
FSampleNumber := 0;
end;
function TSubBandLayer2.GetAllocationLength(Header: THeader): Cardinal;
var ChannelBitrate: Cardinal;
begin
if (Header.Version = MPEG1) then begin
ChannelBitrate := Header.BitrateIndex;
// calculate bitrate per channel:
if (Header.Mode <> SingleChannel) then
if (ChannelBitrate = 4) then
ChannelBitrate := 1
else
dec(ChannelBitrate, 4);
if (ChannelBitrate = 1) or (ChannelBitrate = 2) then begin
// table 3-B.2c or 3-B.2d
if (FSubBandNumber <= 1) then
Result := 4
else
Result := 3;
exit;
end else begin
// tables 3-B.2a or 3-B.2b
if (FSubBandNumber <= 10) then
Result := 4
else if (FSubBandNumber <= 22) then
Result := 3
else
Result := 2;
exit;
end;
end else begin // MPEG-2 LSF -- Jeff
// table B.1 of ISO/IEC 13818-3
if (FSubBandNumber <= 3) then
Result := 4
else if (FSubBandNumber <= 10) then
Result := 3
else
Result := 2;
exit;
end;
end;
procedure TSubBandLayer2.PrepareSampleReading(Header: THeader; Allocation: Cardinal;
var GroupingTable: PSingleArray; var Factor: Single; var CodeLength: Cardinal; var C,
D: Single);
var ChannelBitrate: Cardinal;
begin
ChannelBitrate := Header.BitrateIndex;
// calculate bitrate per channel:
if (Header.Mode <> SingleChannel) then
if (ChannelBitrate = 4) then
ChannelBitrate := 1
else
dec(ChannelBitrate, 4);
if (ChannelBitrate = 1) or (ChannelBitrate = 2) then begin
// table 3-B.2c or 3-B.2d
GroupingTable := TableCDGroupingtables[Allocation];
Factor := TableCDFactor[Allocation];
CodeLength := TableCDCodelength[Allocation];
C := TableCDC[Allocation];
D := TableCDD[Allocation];
end else begin
// tables 3-B.2a or 3-B.2b
if (FSubBandNumber <= 2) then begin
Groupingtable := TableAB1GroupingTables[Allocation];
Factor := TableAB1Factor[Allocation];
CodeLength := TableAB1CodeLength[Allocation];
C := TableAB1C[Allocation];
D := TableAB1D[Allocation];
end else begin
GroupingTable := TableAB234GroupingTables[Allocation];
if (FSubBandNumber <= 10) then begin
Factor := TableAB2Factor[Allocation];
CodeLength := TableAB2CodeLength[Allocation];
C := TableAB2C[Allocation];
D := TableAB2D[Allocation];
end else if (FSubBandNumber <= 22) then begin
Factor := TableAB3Factor[Allocation];
CodeLength := TableAB3CodeLength[Allocation];
C := TableAB3C[Allocation];
D := TableAB3D[Allocation];
end else begin
Factor := TableAB4Factor[Allocation];
CodeLength := TableAB4CodeLength[Allocation];
C := TableAB4C[Allocation];
D := TableAB4D[Allocation];
end;
end;
end;
end;
function TSubBandLayer2.PutNextSample(Channels: TChannels; Filter1,
Filter2: TSynthesisFilter): boolean;
var Sample: Single;
begin
if (FAllocation <> 0) and (Channels <> Right) then begin
Sample := FSamples[FSampleNumber];
if (FGroupingTable = nil) then
Sample := (Sample + FD) * FC;
if (FGroupNumber <= 4) then
Sample := Sample * FScaleFactor1
else if (FGroupNumber <= 8) then
Sample := Sample * FScaleFactor2
else
Sample := Sample * FScaleFactor3;
Filter1.InputSample(Sample, FSubBandNumber);
end;
inc(FSampleNumber);
if (FSampleNumber = 3) then
Result := True
else
Result := False;
end;
procedure TSubBandLayer2.ReadAllocation(Stream: TBitStream;
Header: THeader; CRC: TCRC16);
var Length: Cardinal;
begin
Length := GetAllocationLength(Header);
FAllocation := Stream.GetBits(Length);
if (CRC <> nil) then
CRC.AddBits(FAllocation, Length);
end;
function TSubBandLayer2.ReadSampleData(Stream: TBitStream): boolean;
var SampleCode: Cardinal;
begin
if (FAllocation <> 0) then
if (FGroupingTable <> nil) then begin
SampleCode := Stream.GetBits(FCodeLength);
// create requantized samples:
inc(SampleCode, SampleCode shl 1);
FSamples[0] := FGroupingTable[SampleCode];
FSamples[1] := FGroupingTable[SampleCode+1];
FSamples[2] := FGroupingTable[SampleCode+2];
end else begin
FSamples[0] := Stream.GetBits(FCodeLength) * FFactor - 1.0;
FSamples[1] := Stream.GetBits(FCodeLength) * FFactor - 1.0;
FSamples[2] := Stream.GetBits(FCodeLength) * FFactor - 1.0;
end;
FSampleNumber := 0;
inc(FGroupNumber);
if (FGroupnumber = 12) then
Result := True
else
Result := False;
end;
procedure TSubBandLayer2.ReadScaleFactor(Stream: TBitStream;
Header: THeader);
begin
if (FAllocation <> 0) then begin
case FSCFSI of
0: begin
FScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FScaleFactor2 := ScaleFactors[Stream.GetBits(6)];
FScaleFactor3 := ScaleFactors[Stream.GetBits(6)];
end;
1: begin
FScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FScaleFactor2 := FScaleFactor1;
FScaleFactor3 := ScaleFactors[Stream.GetBits(6)];
end;
2: begin
FScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FScaleFactor2 := FScaleFactor1;
FScaleFactor3 := FScaleFactor1;
end;
3: begin
FScaleFactor1 := Scalefactors[Stream.GetBits(6)];
FScaleFactor2 := ScaleFactors[Stream.GetBits(6)];
FScaleFactor3 := FScaleFactor2;
end;
end;
PrepareSampleReading(Header, FAllocation, FGroupingtable, FFactor, FCodeLength, FC, FD);
end;
end;
procedure TSubBandLayer2.ReadScaleFactorSelection(Stream: TBitStream; CRC: TCRC16);
begin
if (FAllocation <> 0) then begin
FSCFSI := Stream.GetBits(2);
if (CRC <> nil) then
CRC.AddBits(FSCFSI, 2);
end;
end;
{ TSubbandLayer2IntensityStereo }
function TSubbandLayer2IntensityStereo.PutNextSample(Channels: TChannels;
Filter1, Filter2: TSynthesisFilter): boolean;
var Sample, Sample2: Single;
begin
if (FAllocation <> 0) then begin
Sample := FSamples[FSampleNumber];
if (FGroupingTable = nil) then
Sample := (Sample + FD) * FC;
if (Channels = Both) then begin
Sample2 := Sample;
if (FGroupNumber <= 4) then begin
Sample := Sample * FScaleFactor1;
Sample2 := Sample2 * FChannel2ScaleFactor1;
end else if (FGroupNumber <= 8) then begin
Sample := Sample * FScaleFactor2;
Sample2 := Sample2 * FChannel2ScaleFactor2;
end else begin
Sample := Sample * FScaleFactor3;
Sample2 := Sample2 * FChannel2ScaleFactor3;
end;
Filter1.InputSample(Sample, FSubBandNumber);
Filter2.InputSample(Sample2, FSubBandNumber);
end else if (Channels = Left) then begin
if (FGroupNumber <= 4) then
Sample := Sample * FScaleFactor1
else if (FGroupNumber <= 8) then
Sample := Sample * FScaleFactor2
else
Sample := Sample * FScaleFactor3;
Filter1.InputSample(Sample, FSubBandNumber);
end else begin
if (FGroupNumber <= 4) then
Sample := Sample * FChannel2ScaleFactor1
else if (FGroupNumber <= 8) then
Sample := Sample * FChannel2ScaleFactor2
else
Sample := Sample * FChannel2ScaleFactor3;
Filter1.InputSample(Sample, FSubBandNumber);
end;
end;
inc(FSampleNumber);
if (FSampleNumber = 3) then
Result := True
else
Result := False;
end;
procedure TSubbandLayer2IntensityStereo.ReadScaleFactor(Stream: TBitStream;
Header: THeader);
begin
if (FAllocation <> 0) then begin
inherited ReadScaleFactor(Stream, Header);
case FChannel2SCFSI of
0: begin
FChannel2ScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor2 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor3 := ScaleFactors[Stream.GetBits(6)];
end;
1: begin
FChannel2ScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor2 := FChannel2ScaleFactor1;
FChannel2ScaleFactor3 := ScaleFactors[Stream.GetBits(6)];
end;
2: begin
FChannel2ScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor2 := FChannel2ScaleFactor1;
FChannel2ScaleFactor3 := FChannel2ScaleFactor1;
end;
3: begin
FChannel2ScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor2 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor3 := FChannel2ScaleFactor2;
end;
end;
end;
end;
procedure TSubbandLayer2IntensityStereo.ReadScaleFactorSelection(
Stream: TBitStream; CRC: TCRC16);
begin
if (FAllocation <> 0) then begin
FSCFSI := Stream.GetBits(2);
FChannel2SCFSI := Stream.GetBits(2);
if (CRC <> nil) then begin
CRC.AddBits(FSCFSI, 2);
CRC.AddBits(FChannel2SCFSI, 2);
end;
end;
end;
{ TSubbandLayer2Stereo }
function TSubbandLayer2Stereo.PutNextSample(Channels: TChannels; Filter1,
Filter2: TSynthesisFilter): boolean;
var Sample: Single;
begin
Result := inherited PutNextSample(Channels, Filter1, Filter2);
if (FChannel2Allocation <> 0) and (Channels <> Left) then begin
Sample := FChannel2Samples[FSampleNumber - 1];
if (FChannel2GroupingTable = nil) then
Sample := (Sample + FChannel2D) * FChannel2C;
if (FGroupNumber <= 4) then
Sample := Sample * FChannel2ScaleFactor1
else if (FGroupNumber <= 8) then
Sample := Sample * FChannel2ScaleFactor2
else
Sample := Sample * FChannel2ScaleFactor3;
if (Channels = Both) then
Filter2.InputSample(Sample, FSubBandNumber)
else
Filter1.InputSample(Sample, FSubBandNumber);
end;
end;
procedure TSubbandLayer2Stereo.ReadAllocation(Stream: TBitStream;
Header: THeader; CRC: TCRC16);
var Length: Cardinal;
begin
Length := GetAllocationLength(Header);
FAllocation := Stream.GetBits(Length);
FChannel2Allocation := Stream.GetBits(Length);
if (CRC <> nil) then begin
CRC.AddBits(FAllocation, Length);
CRC.AddBits(FChannel2Allocation, Length);
end;
end;
function TSubbandLayer2Stereo.ReadSampleData(Stream: TBitStream): boolean;
var SampleCode: Cardinal;
begin
Result := inherited ReadSampleData(Stream);
if (FChannel2Allocation <> 0) then
if (FChannel2GroupingTable <> nil) then begin
SampleCode := Stream.GetBits(FChannel2CodeLength);
// create requantized samples:
inc(SampleCode, SampleCode shl 1);
FChannel2Samples[0] := FChannel2GroupingTable[SampleCode];
FChannel2Samples[1] := FChannel2GroupingTable[SampleCode+1];
FChannel2Samples[2] := FChannel2GroupingTable[SampleCode+2];
end else begin
FChannel2Samples[0] := Stream.GetBits(FChannel2CodeLength) * FChannel2Factor - 1.0;
FChannel2Samples[1] := Stream.GetBits(FChannel2CodeLength) * FChannel2Factor - 1.0;
FChannel2Samples[2] := Stream.GetBits(FChannel2CodeLength) * FChannel2Factor - 1.0;
end;
end;
procedure TSubbandLayer2Stereo.ReadScaleFactor(Stream: TBitStream;
Header: THeader);
begin
inherited ReadScaleFactor(Stream, Header);
if (FChannel2Allocation <> 0) then begin
case FChannel2SCFSI of
0: begin
FChannel2ScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor2 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor3 := ScaleFactors[Stream.GetBits(6)];
end;
1: begin
FChannel2ScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor2 := FChannel2ScaleFactor1;
FChannel2ScaleFactor3 := ScaleFactors[Stream.GetBits(6)];
end;
2: begin
FChannel2ScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor2 := FChannel2ScaleFactor1;
FChannel2ScaleFactor3 := FChannel2ScaleFactor1;
end;
3: begin
FChannel2ScaleFactor1 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor2 := ScaleFactors[Stream.GetBits(6)];
FChannel2ScaleFactor3 := FChannel2ScaleFactor2;
end;
end;
PrepareSampleReading(Header, FChannel2Allocation, FChannel2GroupingTable,
FChannel2Factor, FChannel2CodeLength, FChannel2C, FChannel2D);
end;
end;
procedure TSubbandLayer2Stereo.ReadScaleFactorSelection(Stream: TBitStream;
CRC: TCRC16);
begin
if (FAllocation <> 0) then begin
FSCFSI := Stream.GetBits(2);
if (CRC <> nil) then
CRC.AddBits(FSCFSI, 2);
end;
if (FChannel2Allocation <> 0) then begin
FChannel2SCFSI := Stream.GetBits(2);
if (CRC <> nil) then
CRC.AddBits(FChannel2SCFSI, 2);
end;
end;
end.