1、 53556.7null2013 . III (MPEG-4 AUDIO) (HILN)ISO/IEC 14496-3:2009(NEQ) 53556.72013II1 - - - ( )2 480 3 - 22 2013 . 1704-4 / 14496-3:2009 . -. 3. (ISO/IEC 14496-3:2009 Information technology Coding of audio-visual objects Part 3: Audio, NEQ)5 1.02012 ( 8). ( 1 ) , - . () - . , (gost.ru) , 2014 , - - 5
2、3556.72013III1 .11.1 12 .23 .23.1 (ParametricSpecificConfig) .23.2 (slPacketPayload)54 264.1 (ParametricSpecificConfig) .264.2 (slPacketPayload)275 .295.1 HILN .295.2 .476 476.1 .476.2 ER HILN .48 () 49 541 20140901 1 HILN, - -. 4 16 /. HILN . - HVXC . 1.1 MPEG-4 HILN ( ), , 4 / , . HILN - . HILN MP
3、EG-4 (HVXC), - , . : 1 PARAmode 0 HVXC1 HILN2 HVXC/HILN3 HVXC/HILNPARAmodes 0 1 HVXC HILN. PARAmode 2 HVXC HILN . PARAmode 3 HVXC HILN , () . “ HVXC/HILN” “ HVXC/HILN” HVXC HILN PARAswitchMode PARAmixMode - 53556.72013 . III (MPEG-4 AUDIO) (HILN)Sound broadcasting digital.Coding of signals of sound
4、broadcasting with reduction of redundancy for transfer on digital communication channels. A part III (MPEG-4 audio). Parametric audio coding (HILN) 53556.720132 . HVXC HILN , , FIFO HVXC HILN. , HVXC HILN - , -. HVXC 20 , -. HILN - , HILN. HILN (numLine = 0), HILNframe (). 2 , 53556.02009. 3 MPEG-4,
5、 , : , . pseudo-C. LARH1, LARH2, LARH3, LARN1, LARN2, DIA, DIF, DHF, DFS , - “vlclbf”. SDC , “vlclbf”, HILN SubDivisionCode, SDCdecode (), . 3.1 (ParametricSpecificConfig) ParametricSpecificConfig () . HILN ParametricSpecificConfig () isBaseLayer = 1. / HILN HILN T/F , - HILN HILN. HILN HILN HILN. P
6、arametricSpecificConfig () isBaseLayer = 0. 2 ParametricSpecificConfig () ParametricSpecificConfig () isBaseLayer; 1 uimsbfif (isBaseLayer) PARAconfig ();else HILNenexConfig (); 53556.7201333.1.1 3 PARAconfig () PARAconfig () PARAmode; 2 uimsbfif (PARAmode! = 1) ErHVXCconfig (); if (PARAmode! = 0) H
7、ILNconfig (); PARAextensionFlag; 1 uimsbfif (PARAextensionFlag) /* to be defined in MPEG 4 Phase 3 */ 4 PARAmodePARAmode 0 20 (N = 160 ) HVXC 1 . 3.1.2 5.1.4.3.3 HILN 2 40 (N = 320 ) HVXC/HILN 3 40 (N = 320 ) HVXC/HILN 3.1.2 HILN 5 HILNconfig HILNconfig () HILNquantMode; 1 uimsbf HILNmaxNumLine; 8 u
8、imsbf HILNsampleRateCode; 4 uimsbfHILNframeLength; 12 uimsbf HILNcontMode; 2 uimsbf 6 HILNenexConfig () HILNconfig () HILNenhaLayer 1 uimsbf 53556.720134 if (HILNenhaLayer) HILNenhaQuantMode 2 uimsbf 7 HILNsampleRateCodeHILNsampleRateCode sampleRate maxFIndex0 96000 890 1 88200 876 2 64000 825 3 480
9、00 779 4 44100 765 5 32000 714 6 24000 668 7 22050 654 8 16000 603 9 12000 557 10 11025 544 11 8000 492 12 7350 479 13 14 15 8 linebits HILNmaxNumLine 0 1 2 3 4 7 8 15 16 31 32 63 64 127 128 255 linebits 0 1 2 3 4 5 6 7 8 9 HILNcontModeHILNcontMode (. 5.1.4.3.1) 0 1 0 2 3 () (fEnhbits i) HILNenhaFra
10、me () : : fEnhbits i = max (0, fEnhbitsBase ILFreqIndex i + fEnhbitsMode HILNenhaQuantMode) : fEnhbits i = max (0, fEnhbitsBase harmFreqIndex + fEnhbitsMode HILNenhaQuantMode + fEnhbitsHarm i) 6 53556.720135 10 fEnhbitsBaseILFreqIndex harmFreqIndex fEnhbitsBase 0 159 0 1243 0 160 269 1244 1511 1 270
11、 380 1512 1779 2 381 491 1780 2047 3 492 602 4 603 713 5 714 890 6 11 fEnhbitsMode HILNenhaQuantMode 0 1 2 3 fEnhbitsMode 3 2 1 0 12 fEnhbitsHarm i 0 1 2 3 4 7 8 9 fEnhbitsHarm i 0 1 2 3 4 13 HILNtmbits 4 atkbits 4 decbits 4 tmEnhbits 3 atkEnhbits 2 decEnhbits 2 phasebits 5 3.2 (slPacketPayload) - S
12、L . . - HILN : slPacketPayload PARAframe (); / HILN . HILN, HILN. HILN, - HILN HILN. HILN , , - HILN : 53556.7201361 HILNbasicFrame () 2 HILNextFrame (1) 1- ( ) 3 HILNextFrame (2) 2- ( 1- ) 4 . . HILN - : slPacketPayload HILNenexFrame (); 3.2.1 14 PARAframe () PARAframe ()if (PARAmode = 0) ErHVXCfra
13、me (HVXCrate);else if (PARAmode = 1) HILNframe ();else if (PARAmode = 2) switchFrame ();else if (PARAmode = 3) mixFrame (); 15 switchFrame () switchFrame () PARAswitchMode; if (PARAswitchMode = 0) 1uimsbfErHVXCdoubleframe (HVXCrate);else HILNframe (); 53556.720137 PARAswitchModes: 16 PARAswitchModeP
14、ARAswitchMode 0 HVXC 1 HILN 17 mixFrame () mixFrame () PARAmixMode; 2 uimsbf if (PARAmixMode = 0) ErHVXCdoubleframe (HVXCrate); else if (PARAmixMode = 1) ILNframe ();ErHVXCdoubleframe (2000); else if (PARAmixMode = 2) HILNframe ();ErHVXCdoubleframe (4000); else if (PARAmixMode = 3) HILNframe (); PAR
15、AmixModes: 18 PARAmixModePARAmixMode 0 HVXC 1 HVXC 2 / HILN 2 HVXC 4 / HILN 3 HILN 19 HVXCdoubleframe () ErHVXCdoubleframe (rate) if (rate = 3000) ErHVXCfixframe (4000); 53556.720138 ErHVXCfixframe (rate); else ErHVXCfixframe (2000); ErHVXCfixframe (rate); 3.2.2 HILN 20 HILNframe () HILNframe ()numL
16、ayer = 0; HILNbasicFrameESC0 (); HILNbasicFrameESC1 ();HILNbasicFrameESC2 (); HILNbasicFrameESC3 ();HILNbasicFrameESC4 ();layNumLine 0 = numLine;layPrevNumLine 0 = prevNumLine;for (k = 0; k 10; else g = (max +min) 1;dp = 1;if (GetBit() = = 0) pp - = dp; max = g; else pp+ = dp;min = g + 1;return max;4 4.1 (ParametricSpecificConfig) : isBaseLayer , , - (1) (0).
