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authMultimediaAssignment2018
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Add Huffman encoding to level 3

master
Apostolos Fanakis 6 years ago
parent
f25e214b6b
commit
de88edcb11
5 changed files with 48 additions and 31 deletions
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  1. 10
      Level_2/TNS.m
  2. 27
      Level_3/AACoder3.m
  3. BIN
      Level_3/decoded3.wav
  4. BIN
      Level_3/encoded.mat
  5. 42
      Level_3/iAACoder3.m

10
Level_2/TNS.m
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@ -60,7 +60,8 @@ function [frameFout, TNScoeffs] = TNS(frameFin, frameType)
[linPredCoeff, ~] = lpc(normalizedFrameFin, LPF_ORDER);
% Quantizes these coefficients
quantizedLinPredCoeff = round(linPredCoeff, COEF_RES);
quantizedLinPredCoeff = quantiz(linPredCoeff(2:end), -0.7:0.1:0.7);
quantizedLinPredCoeff = [1 -0.75 + 0.1 * quantizedLinPredCoeff];
% Filters MDCT coefficients
if ~isstable(1, quantizedLinPredCoeff)
@ -102,10 +103,11 @@ function [frameFout, TNScoeffs] = TNS(frameFin, frameType)
% Calculates the linear prediction coefficients
[linPredCoeff, ~] = lpc(normalizedFrameFin, LPF_ORDER);
% Quantizes these coefficients
quantizedLinPredCoeff = round(linPredCoeff, COEF_RES);
quantizedLinPredCoeff = quantiz(linPredCoeff(2:end), -0.7:0.1:0.7);
quantizedLinPredCoeff = [1 -0.75 + 0.1 * quantizedLinPredCoeff];
% Filters MDCT coefficients
if ~isstable(1, quantizedLinPredCoeff)
error('TNS, l[79]: Inverse filter not stable!');

27
Level_3/AACoder3.m
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@ -79,6 +79,7 @@ function AACSeq3 = AACoder3(fNameIn, fnameAACoded)
GR = 0;
sfcL = 0;
sfcR = 0;
continue;
else
prev1FrameStart = (i - 1) * 1024 + 1;
prev1FrameStop = prev1FrameStart + 2047;
@ -100,16 +101,20 @@ function AACSeq3 = AACoder3(fNameIn, fnameAACoded)
TL = 0;
TR = 0;
streamL = SL;
huffcodebookL = 0;
streamR = SR;
huffcodebookR = 0;
% [streamL, huffcodebookL] = encodeHuff(SL, huffLUT);
% [streamR, huffcodebookR] = encodeHuff(SR, huffLUT);
% [sfcL, ~] = encodeHuff(sfcL, huffLUT, 12);
% [sfcR, ~] = encodeHuff(sfcR, huffLUT, 12);
[streamL, huffcodebookL] = encodeHuff(SL, huffLUT);
[streamR, huffcodebookR] = encodeHuff(SR, huffLUT);
if strcmp(frameTypes(i+1), 'ESH')
[sfcHuffL, ~] = encodeHuff(reshape(sfcL(2:end, :), 1, [])', ...
huffLUT, 12);
[sfcHuffR, ~] = encodeHuff(reshape(sfcR(2:end, :), 1, [])', ...
huffLUT, 12);
else
[sfcHuffL, ~] = encodeHuff(sfcL(2:end), huffLUT, 12);
[sfcHuffR, ~] = encodeHuff(sfcR(2:end), huffLUT, 12);
end
AACSeq3(i + 1).frameType = frameTypes(i + 1);
AACSeq3(i + 1).winType = WINDOW_TYPE;
AACSeq3(i + 1).chl.TNScoeffs = TNScoeffsL;
@ -118,8 +123,8 @@ function AACSeq3 = AACoder3(fNameIn, fnameAACoded)
AACSeq3(i + 1).chr.T = TR;
AACSeq3(i + 1).chl.G = GL;
AACSeq3(i + 1).chr.G = GR;
AACSeq3(i + 1).chl.sfc = sfcL;
AACSeq3(i + 1).chr.sfc = sfcR;
AACSeq3(i + 1).chl.sfc = sfcHuffL;
AACSeq3(i + 1).chr.sfc = sfcHuffR;
AACSeq3(i + 1).chl.stream = streamL;
AACSeq3(i + 1).chr.stream = streamR;
AACSeq3(i + 1).chl.codebook = huffcodebookL;

BIN
Level_3/decoded3.wav
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Level_3/encoded.mat
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42
Level_3/iAACoder3.m
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@ -49,6 +49,7 @@ function x = iAACoder3(AACSeq3, fNameOut)
currFrameStop = currFrameStart + 2047;
if i < 2
continue;
frameF(:, 1) = iTNS(AACSeq3(i + 1).chl.stream, ...
AACSeq3(i+1).frameType, ...
AACSeq3(i + 1).chl.TNScoeffs);
@ -58,22 +59,29 @@ function x = iAACoder3(AACSeq3, fNameOut)
frameT = iFilterbank(frameF, AACSeq3(i+1).frameType, AACSeq3(i+1).winType);
else
% SL = decodeHuff(AACSeq3(i + 1).chl.stream, ...
% AACSeq3(i + 1).chl.codebook, huffLUT);
% SR = decodeHuff(AACSeq3(i + 1).chr.stream, ...
% AACSeq3(i + 1).chr.codebook, huffLUT);
%
% sfcL = decodeHuff(AACSeq3(i + 1).chl.sfc, 12, huffLUT);
% sfcR = decodeHuff(AACSeq3(i + 1).chr.sfc, 12, huffLUT);
frameF(:, 1) = iAACquantizer(AACSeq3(i + 1).chl.stream, ...
AACSeq3(i + 1).chl.sfc, ...
AACSeq3(i + 1).chl.G, ...
AACSeq3(i+1).frameType);
frameF(:, 2) = iAACquantizer(AACSeq3(i + 1).chr.stream, ...
AACSeq3(i + 1).chr.sfc, ...
AACSeq3(i + 1).chr.G, ...
AACSeq3(i+1).frameType);
SL = decodeHuff(AACSeq3(i + 1).chl.stream, ...
AACSeq3(i + 1).chl.codebook, huffLUT);
SR = decodeHuff(AACSeq3(i + 1).chr.stream, ...
AACSeq3(i + 1).chr.codebook, huffLUT);
sfcL = decodeHuff(AACSeq3(i + 1).chl.sfc, 12, huffLUT)';
sfcR = decodeHuff(AACSeq3(i + 1).chr.sfc, 12, huffLUT)';
if strcmp(AACSeq3(i+1).frameType, 'ESH')
sfcDeHuffL(42, 8) = 0;
sfcDeHuffR(42, 8) = 0;
sfcDeHuffL(2:end, :) = reshape(sfcL, [41 8]);
sfcDeHuffR(2:end, :) = reshape(sfcR, [41 8]);
sfcDeHuffL(1, :) = AACSeq3(i+1).chl.G;
sfcDeHuffR(1, :) = AACSeq3(i+1).chr.G;
else
sfcDeHuffL = [AACSeq3(i+1).chl.G; sfcL];
sfcDeHuffR = [AACSeq3(i+1).chr.G; sfcR];
end
frameF(:, 1) = iAACquantizer(SL, sfcDeHuffL, ...
AACSeq3(i + 1).chl.G, AACSeq3(i+1).frameType);
frameF(:, 2) = iAACquantizer(SR, sfcDeHuffR, ...
AACSeq3(i + 1).chr.G, AACSeq3(i+1).frameType);
frameF(:, 1) = iTNS(frameF(:, 1), ...
AACSeq3(i+1).frameType, ...
@ -86,6 +94,8 @@ function x = iAACoder3(AACSeq3, fNameOut)
end
decodedAudio(currFrameStart:currFrameStop, :) = decodedAudio(currFrameStart:currFrameStop, :) + frameT;
clearvars sfcDeHuffL sfcDeHuffR
end
audiowrite(fNameOut, decodedAudio, 48000);

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