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{MPC file format}
unit fmt_MPC;
{$include compilers.inc}
interface
uses wat_api;
function ReadMPC(var Info:tSongInfo):boolean; cdecl;
implementation
uses windows,common,io,tags,srv_format;
const
DefID = $002B504D;// 'MP+'
function ReadMPC(var Info:tSongInfo):boolean; cdecl;
var
f:THANDLE;
tmp:array [0..5] of dword;
samples,TotalFrames:dword;
lastframe:dword;
begin
result:=false;
f:=Reset(Info.mfile);
if f=THANDLE(INVALID_HANDLE_VALUE) then
exit;
ReadID3v2(f,Info);
BlockRead(f,tmp,SizeOf(tmp));
if ((tmp[0] and $FFFFFF)=DefID) and
(((tmp[0] shr 24) and $0F)>=7) then // sv7-sv8
begin
Info.kbps:=0;
if (tmp[2] and 2)<>0 then
Info.channels:=2
else
Info.channels:=1;
case (tmp[2] and $3000) shr 12 of //C000-14?
00: Info.khz:=44100;
01: Info.khz:=48000;
02: Info.khz:=37800;
03: Info.khz:=32000;
end;
lastframe:=(tmp[5] and $FFF) shr 1;
samples:=tmp[1]*1152+lastframe;
end
else
begin //4-6
if not ((tmp[0] and $1FFF) and $3FF) in [4..6] then
exit;
Info.khz:=44100;
Info.kbps:=tmp[1] and $1F;
if ((tmp[0] and $1FFF) and $3FF)=4 then
TotalFrames:=loword(tmp[2])
else
TotalFrames:=tmp[2];
samples:=TotalFrames*1152;
end;
if Info.khz<>0 then
Info.total:=samples div Info.khz;
Info.khz:=Info.khz div 1000;
if (Info.kbps=0) and (samples<>0) then
// if fs=samples*channels*deep/8 then kbps=khz*deep*channels/1152
// Info.kbps:=(Info.khz*8)*taginfo.FileSize/1152/samples;
Info.kbps:=(Info.khz div 8)*FileSize(f) div samples; //!!
ReadAPEv2(f,Info);
ReadID3v1(f,Info);
CloseHandle(f);
result:=true;
end;
var
LocalFormatLink:twFormat;
procedure InitLink;
begin
LocalFormatLink.Next:=FormatLink;
LocalFormatLink.This.proc :=@ReadMPC;
LocalFormatLink.This.ext :='MPC';
LocalFormatLink.This.flags:=0;
FormatLink:=@LocalFormatLink;
end;
initialization
InitLink;
end.
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