You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
53 lines
2.7 KiB
53 lines
2.7 KiB
function [SNR, bitrate, compression] = demoAAC3(fNameIn, fNameOut, frameAACoded)
|
|
%Function that demonstrates usage of the level 3 code
|
|
% Usage [SNR, bitrate, compression] = demoAAC3(fNameIn, fNameOut, frameAACoded), where:
|
|
% Inputs
|
|
% - fNameIn is the filename and path of the file to encode
|
|
% - fNameOut is the filename and path of the wav file that will be
|
|
% written after decoding
|
|
% - frameAACoded is the filename and path of the mat file that will
|
|
% be written after encoding
|
|
%
|
|
% Output
|
|
% - SNR is the signal to noise ration computed after successively
|
|
% encoding and decoding the audio signal
|
|
% - bitrate is the bits per second
|
|
% - compression is the ratio of the bitrate before the encoding to
|
|
% the bitrate after it
|
|
|
|
AACSeq3 = AACoder3(fNameIn, frameAACoded);
|
|
decodedAudio = iAACoder3(AACSeq3, fNameOut);
|
|
|
|
[audioData, ~] = audioread(fNameIn);
|
|
|
|
% figure()
|
|
% plot(audioData(1025:length(decodedAudio)-1024, 1) - decodedAudio(1025:end-1024, 1))
|
|
% for frame = 1:length(AACSeq1)
|
|
% if strcmp(AACSeq1(frame).frameType, 'LSS') || strcmp(AACSeq1(frame).frameType, 'LPS')
|
|
% % Add lines
|
|
% h1 = line([(frame-1)*1024+1 (frame-1)*1024+1],[-2*10^(-15) 2*10^(-15)]);
|
|
% h2 = line([frame*1024+1 frame*1024+1],[-2*10^(-15) 2*10^(-15)]);
|
|
% % Set properties of lines
|
|
% set([h1 h2],'Color','y','LineWidth',2)
|
|
% % Add a patch
|
|
% 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')
|
|
% elseif strcmp(AACSeq1(frame).frameType, 'ESH')
|
|
% % Add lines
|
|
% h1 = line([(frame-1)*1024+1 (frame-1)*1024+1],[-2*10^(-15) 2*10^(-15)]);
|
|
% h2 = line([frame*1024+1 frame*1024+1],[-2*10^(-15) 2*10^(-15)]);
|
|
% % Set properties of lines
|
|
% set([h1 h2],'Color','r','LineWidth',2)
|
|
% % Add a patch
|
|
% 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')
|
|
% end
|
|
% end
|
|
% set(gca,'children',flipud(get(gca,'children')))
|
|
%
|
|
% figure()
|
|
% plot(audioData(1025:length(decodedAudio)-1024, 2) - decodedAudio(1025:end-1024, 2))
|
|
|
|
snr(audioData(1025:length(decodedAudio)-1024, 1), audioData(1025:length(decodedAudio)-1024, 1) - decodedAudio(1025:end-1024, 1))
|
|
snr(audioData(1025:length(decodedAudio)-1024, 2), audioData(1025:length(decodedAudio)-1024, 2) - decodedAudio(1025:end-1024, 2))
|
|
SNR = 10*log10((sum(audioData(1025:length(decodedAudio)-1024, :)) .^ 2) ./ ...
|
|
(sum(audioData(1025:length(decodedAudio)-1024, :) - decodedAudio(1025:end-1024, :)) .^ 2));
|
|
end
|
|
|