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{AAC file process}
unit fmt_AAC;
{$include compilers.inc}
interface
uses wat_api;
function ReadAAC(var Info:tSongInfo):boolean; cdecl;
implementation
uses windows,common,io,tags,srv_format;
const
SampleRates:array [0..15] of dword = (
96000,88200,64000,48000,44100,32000,24000,22050,
16000,12000,11025,8000,0,0,0,0);
procedure ReadADIFheader(f:THANDLE;var Info:tSongInfo);
var
buf:array [0..29] of byte;
bs,sf_idx,skip:dword;
begin
BlockRead(f,buf,30);
if (buf[0] and $80)<>0 then
skip:=9
else
skip:=0;
Info.kbps:=(((buf[0+skip] and $0F) shl 19)+(buf[1+skip] shl 11)+
(buf[2+skip] shl 3)+{or}((buf[3+skip] and $E0){shr 5})) div 1000;
bs:=buf[0+skip] and $10;
if bs=0 then
sf_idx:=(buf[7+skip] and $78) shr 3
else
sf_idx:=((buf[4+skip] and $07) shl 1)+((buf[5+skip] and $80) shr 7);
Info.khz:=SampleRates[sf_idx];
end;
procedure ReadADTSheader(var Info:tSongInfo;sign:dword);
type
l2b=record
b:array [0..3] of byte;
end;
var
sr_idx:integer;
begin
Info.channels:=((l2b(sign).b[2] and $01) shl 2)+
((l2b(sign).b[3] and $C0) shr 6);
sr_idx:=(l2b(sign).b[2] and $3C) shr 2;
Info.khz:=SampleRates[sr_idx] div 1000;
end;
function ReadAAC(var Info:tSongInfo):boolean; cdecl;
var
f:THANDLE;
sign:dword;
begin
result:=false;
f:=Reset(Info.mfile);
if f=THANDLE(INVALID_HANDLE_VALUE) then
exit;
ReadID3v2(f,Info);
BlockRead(f,sign,4);
Info.khz:=44;
Info.kbps:=128;
Info.channels:=2;
if (lobyte(sign)=$FF) and ((hibyte(sign) and $F6)=$F0) then
ReadADTSheader(Info,sign)
else if sign=$46494441 then // 'ADIF'
ReadADIFheader(f,Info);
ReadAPEv2(f,Info);
ReadID3v1(f,Info);
CloseHandle(f);
result:=true;
end;
var
LocalFormatLink:twFormat;
procedure InitLink;
begin
LocalFormatLink.Next:=FormatLink;
LocalFormatLink.This.proc :=@ReadAAC;
LocalFormatLink.This.ext :='AAC';
LocalFormatLink.This.flags:=0;
FormatLink:=@LocalFormatLink;
end;
initialization
InitLink;
end.
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