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authMultimediaAssignment2018
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Add AACquantizer for ESH frames, Init iAACquantizer, Various fixes

master
Apostolos Fanakis 6 years ago
parent
7b5c2767a6
commit
4df32105b6
6 changed files with 140 additions and 45 deletions
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  1. 36
      Level_3/AACoder3.m
  2. 46
      Level_3/AACquantizer.m
  3. BIN
      Level_3/decoded2.wav
  4. BIN
      Level_3/encoded.mat
  5. 44
      Level_3/iAACoder3.m
  6. 43
      Level_3/iAACquantizer.m

36
Level_3/AACoder3.m
View File

@ -75,7 +75,10 @@ function AACSeq3 = AACoder3(fNameIn, fnameAACoded)
% TODO: what happens on the first two frames?
SL = frameF(:, 1);
SR = frameF(:, 2);
continue;
GL = 0;
GR = 0;
sfcL = 0;
sfcR = 0;
else
prev1FrameStart = (i - 1) * 1024 + 1;
prev1FrameStop = prev1FrameStart + 2047;
@ -93,13 +96,19 @@ function AACSeq3 = AACoder3(fNameIn, fnameAACoded)
originalAudioData(prev2FrameStart:prev2FrameStop, 2));
[SL, sfcL, GL] = AACquantizer(frameF(:, 1), frameTypes{i+1}, SMRL);
[SR, sfcR, GR] = AACquantizer(frameF(:, 2), frameTypes{i+1}, SMRR);
continue;
end
[streamL, huffcodebookL] = encodeHuff(SL, huffLUT);
[streamR, huffcodebookR] = encodeHuff(SR, huffLUT);
[sfcL, ~] = encodeHuff(sfcL, huffLUT, 12);
[sfcR, ~] = encodeHuff(sfcR, huffLUT, 12);
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);
AACSeq3(i + 1).frameType = frameTypes(i + 1);
AACSeq3(i + 1).winType = WINDOW_TYPE;
@ -115,20 +124,7 @@ function AACSeq3 = AACoder3(fNameIn, fnameAACoded)
AACSeq3(i + 1).chr.stream = streamR;
AACSeq3(i + 1).chl.codebook = huffcodebookL;
AACSeq3(i + 1).chr.codebook = huffcodebookR;
clearvars TL TR;
end
save(fnameAACoded,AACSeq3);
if false
[idx,label] = grp2idx(sort(frameTypes));
hist(idx,unique(idx));
set(gca,'xTickLabel',label)
sum(idx(:) == 1)
sum(idx(:) == 2)
sum(idx(:) == 3)
sum(idx(:) == 4)
end
save(fnameAACoded, 'AACSeq3');
end

46
Level_3/AACquantizer.m
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@ -72,11 +72,49 @@ function [S, sfc, G] = AACquantizer(frameF, frameType, SMR)
end
G = quantCoeff(1);
else
T(SHORT_WINDOW_NUMBER_OF_BANDS) = 0;
T(SHORT_WINDOW_NUMBER_OF_BANDS, 1) = 0;
quantCoeff(SHORT_WINDOW_NUMBER_OF_BANDS, 1) = 0;
sfc(SHORT_WINDOW_NUMBER_OF_BANDS, 8) = 0;
G(1, 8) = 0;
for subFrameIndex = 1:8
currFrameStart = (subFrameIndex - 1) * 128 + 1;
currFrameStop = currFrameStart + 127;
subFrame = frameF(currFrameStart:currFrameStop);
for band = 1:SHORT_WINDOW_NUMBER_OF_BANDS
T(band) = sumsqr(frameF((TNSTables.B219b(band, 2) + 1: ...
TNSTables.B219b(band, 3) + 1), 1));
frameWlow = TNSTables.B219b(band, 2);
frameWhigh = TNSTables.B219b(band, 3);
subFrameF = subFrame(frameWlow + 1:frameWhigh + 1);
T(band) = sumsqr(subFrameF) ./ SMR(band);
% Calculates an initial quantization coefficient and attempts
% quantization
quantCoeff(band) = 16 * log2(max(subFrame) ^ (3 / 4) / 8191) / 3;
S(currFrameStart + frameWlow:currFrameStart + frameWhigh, 1) = sign(subFrameF) .* floor(( ...
abs(subFrameF) .* 2 ^ (-quantCoeff(band) / 4)) ...
.^ (3 / 4) + 0.4054);
% Calculates current quantization error
quantErr = sumsqr(subFrameF - S(currFrameStart + frameWlow:currFrameStart + frameWhigh));
% Gradually increases the quantization coefficient
while quantErr < T(band) && (band > 1 || ...
(quantErr(band) - quantErr(band - 1) + 1) <= 60)
quantCoeff(band) = quantCoeff(band) + 1;
S(currFrameStart + frameWlow:currFrameStart + frameWhigh) = sign(subFrameF) .* round(( ...
abs(subFrameF) .* 2 ^ (-quantCoeff(band) / 4)) ...
.^ (3 / 4) + 0.4054);
quantErr = sumsqr(subFrameF - S(currFrameStart + frameWlow:currFrameStart + frameWhigh));
end
if band == 1
sfc(band, subFrameIndex) = quantCoeff(band);
else
sfc(band, subFrameIndex) = quantCoeff(band) - quantCoeff(band - 1);
end
end
G(1, subFrameIndex) = quantCoeff(1);
end
T = T ./ SMR;
end
end

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Level_3/decoded2.wav
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Level_3/encoded.mat
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44
Level_3/iAACoder3.m
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@ -48,22 +48,42 @@ function x = iAACoder3(AACSeq3, fNameOut)
currFrameStart = i * 1024 + 1;
currFrameStop = currFrameStart + 2047;
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);
if i < 2
frameF(:, 1) = iTNS(AACSeq3(i + 1).chl.stream, ...
AACSeq3(i+1).frameType, ...
AACSeq3(i + 1).chl.TNScoeffs);
frameF(:, 2) = iTNS(AACSeq3(i + 1).chr.stream, ...
AACSeq3(i+1).frameType, ...
AACSeq3(i + 1).chr.TNScoeffs);
sfcL = decodeHuff(AACSeq3(i + 1).chl.sfc, 12, huffLUT); % TODO: maybe LUT(12);
sfcR = decodeHuff(AACSeq3(i + 1).chr.sfc, 12, huffLUT);
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);
frameF(:, 1) = iAACquantizer(SL, sfcL, AACSeq3(i + 1).chl.G, AACSeq3(i+1).frameType);
frameF(:, 2) = iAACquantizer(SR, sfcR, AACSeq3(i + 1).chr.G, AACSeq3(i+1).frameType);
frameF(:, 1) = iTNS(frameF(:, 1), ...
AACSeq3(i+1).frameType, ...
AACSeq3(i + 1).chl.TNScoeffs);
frameF(:, 2) = iTNS(frameF(:, 2), ...
AACSeq3(i+1).frameType, ...
AACSeq3(i + 1).chr.TNScoeffs);
TNScoeffsL = AACSeq3(i + 1).chl.TNScoeffs;
TNScoeffsR = AACSeq3(i + 1).chr.TNScoeffs;
frameF(:, 1) = iTNS(frameF(:, 1), AACSeq3(i+1).frameType, TNScoeffsL);
frameF(:, 2) = iTNS(frameF(:, 2), AACSeq3(i+1).frameType, TNScoeffsR);
frameT = iFilterbank(frameF, AACSeq3(i+1).frameType, AACSeq3(i+1).winType);
end
decodedAudio(currFrameStart:currFrameStop, :) = decodedAudio(currFrameStart:currFrameStop, :) + frameT;
end

43
Level_3/iAACquantizer.m
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@ -19,6 +19,47 @@ function frameF = iAACquantizer(S, sfc, G, frameType)
% representation containing only one of the audio channels stored in
% a vector of length 1024
% Declares constant numbers of bands for long and short windows
LONG_WINDOW_NUMBER_OF_BANDS = 69;
SHORT_WINDOW_NUMBER_OF_BANDS = 42;
end
% Declares persistent variable holding the TNS tables and initializes if empty
persistent TNSTables;
if isempty(TNSTables)
TNSTables = load('TableB219.mat');
end
if ~strcmp(frameType, 'ESH')
for band = 1:LONG_WINDOW_NUMBER_OF_BANDS
frameWlow = TNSTables.B219a(band, 2) + 1;
frameWhigh = TNSTables.B219a(band, 3) + 1;
subFrameS = S(frameWlow:frameWhigh);
if band > 1
sfc(band) = sfc(band) + sfc(band - 1);
end
frameF(frameWlow:frameWhigh) = sign(subFrameS) .* ...
abs(subFrameS) .^ (4 / 3) .* 2 ^ (sfc(band) / 4);
end
else
for subFrameIndex = 1:8
currFrameStart = (subFrameIndex - 1) * 128 + 1;
currFrameStop = currFrameStart + 127;
subFrame = S(currFrameStart:currFrameStop);
for band = 1:SHORT_WINDOW_NUMBER_OF_BANDS
frameWlow = TNSTables.B219b(band, 2);
frameWhigh = TNSTables.B219b(band, 3);
subFrameS = subFrame(frameWlow + 1:frameWhigh + 1);
if band > 1
sfc(band, subFrameIndex) = sfc(band, subFrameIndex) + ...
sfc(band - 1, subFrameIndex);
end
frameF(currFrameStart + frameWlow:currFrameStart + frameWhigh) = sign(subFrameS) .* ...
abs(subFrameS) .^ (4 / 3) .* 2 ^ (sfc(band) / 4);
end
end
end
end

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