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34 lines
1.3 KiB
34 lines
1.3 KiB
function x = iAACoder1(AACSeq1, fNameOut)
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%Implementation of AAC decoder
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% Usage x = iAACoder1(AACSeq1, fNameOut), where:
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% Inputs
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% - fNameOut is the filename and path of the file that will be
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% written after decoding
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% - AACSeq1 is an array of structs containing K structs, where K is
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% the number of computed frames. Every struct of the array consists
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% of a frameType, a winType, chl.frameF which are the MDCT
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% coefficients of this frame's left channel, chr.frameF which are
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% the MDCT coefficients of this frame's right channel
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%
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% Output
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% - x is an array containing the decoded audio samples
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% Initializes an array to hold the decoded samples
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decodedAudio(1024 * (length(AACSeq1) + 1), 2) = 0;
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% Initializes an array to hold both audio channels
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frameF(1024, 2) = 0;
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% Decodes audio file
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for i = 0:length(AACSeq1)-1
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currFrameStart = i * 1024 + 1;
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currFrameStop = currFrameStart + 2047;
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frameF(:, 1) = AACSeq1(i+1).chl.frameF;
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frameF(:, 2) = AACSeq1(i+1).chr.frameF;
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frameT = iFilterbank(frameF, AACSeq1(i+1).frameType, AACSeq1(i+1).winType);
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decodedAudio(currFrameStart:currFrameStop, :) = decodedAudio(currFrameStart:currFrameStop, :) + frameT;
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end
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audiowrite(fNameOut, decodedAudio, 48000);
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x = decodedAudio;
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end
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