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53 lines
2.7 KiB
53 lines
2.7 KiB
function [SNR, bitrate, compression] = demoAAC3(fNameIn, fNameOut, frameAACoded)
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%Function that demonstrates usage of the level 3 code
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% Usage [SNR, bitrate, compression] = demoAAC3(fNameIn, fNameOut, frameAACoded), where:
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% Inputs
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% - fNameIn is the filename and path of the file to encode
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% - fNameOut is the filename and path of the wav file that will be
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% written after decoding
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% - frameAACoded is the filename and path of the mat file that will
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% be written after encoding
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%
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% Output
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% - SNR is the signal to noise ration computed after successively
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% encoding and decoding the audio signal
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% - bitrate is the bits per second
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% - compression is the ratio of the bitrate before the encoding to
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% the bitrate after it
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AACSeq3 = AACoder3(fNameIn, frameAACoded);
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decodedAudio = iAACoder3(AACSeq3, fNameOut);
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[audioData, ~] = audioread(fNameIn);
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% figure()
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% plot(audioData(1025:length(decodedAudio)-1024, 1) - decodedAudio(1025:end-1024, 1))
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% for frame = 1:length(AACSeq3)
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% if strcmp(AACSeq3(frame).frameType, 'LSS') || strcmp(AACSeq3(frame).frameType, 'LPS')
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% % Add lines
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% h1 = line([(frame-1)*1024+1 (frame-1)*1024+1],[-2*10^(-15) 2*10^(-15)]);
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% h2 = line([frame*1024+1 frame*1024+1],[-2*10^(-15) 2*10^(-15)]);
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% % Set properties of lines
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% set([h1 h2],'Color','y','LineWidth',2)
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% % Add a patch
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% patch([(frame-1)*1024+1 frame*1024+1 frame*1024+1 (frame-1)*1024+1],[-2*10^(-15) -2*10^(-15) 2*10^(-15) 2*10^(-15)],'y')
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% elseif strcmp(AACSeq3(frame).frameType, 'ESH')
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% % Add lines
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% h1 = line([(frame-1)*1024+1 (frame-1)*1024+1],[-2*10^(-15) 2*10^(-15)]);
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% h2 = line([frame*1024+1 frame*1024+1],[-2*10^(-15) 2*10^(-15)]);
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% % Set properties of lines
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% set([h1 h2],'Color','r','LineWidth',2)
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% % Add a patch
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% patch([(frame-1)*1024+1 frame*1024+1 frame*1024+1 (frame-1)*1024+1],[-2*10^(-15) -2*10^(-15) 2*10^(-15) 2*10^(-15)],'r')
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% end
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% end
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% set(gca,'children',flipud(get(gca,'children')))
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%
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% figure()
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% plot(audioData(1025:length(decodedAudio)-1024, 2) - decodedAudio(1025:end-1024, 2))
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snr(audioData(1025:length(decodedAudio)-1024, 1), audioData(1025:length(decodedAudio)-1024, 1) - decodedAudio(1025:end-1024, 1))
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snr(audioData(1025:length(decodedAudio)-1024, 2), audioData(1025:length(decodedAudio)-1024, 2) - decodedAudio(1025:end-1024, 2))
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SNR = 10*log10((sum(audioData(1025:length(decodedAudio)-1024, :)) .^ 2) ./ ...
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(sum(audioData(1025:length(decodedAudio)-1024, :) - decodedAudio(1025:end-1024, :)) .^ 2));
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end
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