decoding_main.m

来自「VAD G729 for mobile phone」· M 代码 · 共 54 行

%G729A解码main函数
%将码流文件读入内存中，准备转换成帧输入参数
function speechout=decoding_main(bitstream)

%clear all;
%clc;
%fid=fopen('coding.bit');
%speechin= fread(fid,'int16');
%fclose(fid);

%for i=1:length(speechin)
%    if speechin(i)==127
%        speechin(i)=0;
%    else if speechin(i)==129
%            speechin(i)=1;
%        end
%    end
%end
%bitstream=enframe(speechin,82);
%bitstream=(bitstream(:,3:end));

bitstream=enframe(bitstream,80);

%QuanJuValuedecode();
s=zeros(1,80);
speechout=[];


%/*-----------------------------------------------------------------*
% *            Main decoder routine                                 *
% *-----------------------------------------------------------------*/
for i=1:size(bitstream,1)
    a=dec2bin(bitstream(i,:));
    a=a';     
    %接下来将C1 C2 P0 P1 P2 S1 S2转成10进制数
    [L0,L1,L2,L3,P1,P0,S1,C1,GA1,GB1,P2,S2,C2,GA2,GB2]=destream(a);
    %接下来进行解码
    [s,Az_dec,T2]=G729decode(L0,L1,L2,L3,P1,P0,S1,C1,GA1,GB1,P2,S2,C2,GA2,GB2);
    %round(Az_dec*2^12)'
    %T2
    
    syn_pst=Post_Filter(s, Az_dec, T2);        %/* Post-filter */

    synth=Post_Process(syn_pst);
    
    speechout=[speechout,synth];
end

speechout=speechout/2^15;
%wavwrite(speechout,'syn_speech');