1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
{MKV file process}
unit fmt_MKV;
{$include compilers.inc}
interface
uses wat_api;
function ReadMKV(var Info:tSongInfo):boolean; cdecl;
implementation
uses windows,common,io,srv_format;
const
idEBML = $A45DFA3;
idSegment = $8538067;
idInfo = $549A966;
idTimecodeScale = $AD7B1;
idDuration = $489;
idTracks = $654AE6B;
idTrackEntry = $2E;
idTrackType = $3;
idCodecPrivate = $23A2;
idName = $136E;
idVideo = $60;
idAudio = $61;
idPixelWidth = $30;
idPixelHeight = $3A;
idDefaultDuration = $3E383;
idSamplingFrequency = $35;
idChannels = $1F;
idCluster = $F43B675;
function GetNumber(var ptr:pbyte):int64;
begin
if (ptr^ and $80)<>0 then
result:=ptr^ and $7F
else if (ptr^ and $40)<>0 then
begin
result:=(ptr^ and $3F) shl 8; inc(ptr);
result:=result+ptr^;
end
else if (ptr^ and $20)<>0 then
begin
result:=(ptr^ and $1F) shl 16; inc(ptr);
result:=result+(ptr^ shl 8); inc(ptr);
result:=result+ptr^;
end
else if (ptr^ and $10)<>0 then
begin
result:=(ptr^ and $0F) shl 24; inc(ptr);
result:=result+(ptr^ shl 16); inc(ptr);
result:=result+(ptr^ shl 8); inc(ptr);
result:=result+ptr^;
end
else if (ptr^ and $08)<>0 then
begin
result:=int64(ptr^ and $07) shl 32; inc(ptr);
result:=result+(ptr^ shl 24); inc(ptr);
result:=result+(ptr^ shl 16); inc(ptr);
result:=result+(ptr^ shl 8); inc(ptr);
result:=result+ptr^;
end
else if (ptr^ and $04)<>0 then
begin
result:=int64(ptr^ and $03) shl 40; inc(ptr);
result:=result+(int64(ptr^) shl 32); inc(ptr);
result:=result+(ptr^ shl 24); inc(ptr);
result:=result+(ptr^ shl 16); inc(ptr);
result:=result+(ptr^ shl 8); inc(ptr);
result:=result+ptr^;
end
else if (ptr^ and $02)<>0 then
begin
result:=int64(ptr^ and $01) shl 48; inc(ptr);
result:=result+(int64(ptr^) shl 40); inc(ptr);
result:=result+(int64(ptr^) shl 32); inc(ptr);
result:=result+(ptr^ shl 24); inc(ptr);
result:=result+(ptr^ shl 16); inc(ptr);
result:=result+(ptr^ shl 8); inc(ptr);
result:=result+ptr^;
end
else if (ptr^ and $01)<>0 then
begin
inc(ptr);
result:= (int64(ptr^) shl 48); inc(ptr);
result:=result+(int64(ptr^) shl 40); inc(ptr);
result:=result+(int64(ptr^) shl 32); inc(ptr);
result:=result+(ptr^ shl 24); inc(ptr);
result:=result+(ptr^ shl 16); inc(ptr);
result:=result+(ptr^ shl 8); inc(ptr);
result:=result+ptr^;
end
else
result:=0;
inc(ptr);
end;
function GetInt(var ptr:pbyte;len:integer):int64;
var
i:integer;
begin
result:=0;
for i:=0 to len-1 do
begin
result:=(result shl 8)+ptr^;
inc(ptr);
end;
end;
function GetFloat(var ptr:pbyte):single;
var
i:dword;
f:single absolute i;
begin
i:=( ptr^ shl 24); inc(ptr);
inc(i,ptr^ shl 16); inc(ptr);
inc(i,ptr^ shl 8); inc(ptr);
inc(i,ptr^); inc(ptr);
result:=f;
end;
function ReadMKV(var Info:tSongInfo):boolean; cdecl;
var
f:THANDLE;
id,len:integer;
ptr:pByte;
buf:array [0..16383] of byte;
trktype,scale:integer;
ls:PAnsiChar;
tmp:integer;
lTotal:real;
begin
result:=false;
f:=Reset(Info.mfile);
if f=THANDLE(INVALID_HANDLE_VALUE) then
exit;
BlockRead(f,buf,SizeOf(buf));
ptr:=@buf;
trktype:=0;
lTotal:=0;
scale:=1;
repeat
id :=GetNumber(ptr);
len:=GetNumber(ptr);
if id=idEBML then // just check
begin
result:=true;
inc(ptr,len);
end
else if id=idCluster then
break
else if id=idSegment then // do nothing
else if id=idInfo then // do nothing
else if id=idTracks then // do nothing
else if id=idTrackEntry then // do nothing
else if id=idVideo then // do nothing
else if id=idAudio then // do nothing
else if id=idTimecodeScale then
scale:=GetInt(ptr,len)
else if id=idDuration then
lTotal:=GetFloat(ptr)
else if id=idTrackType then
begin
tmp:=trktype;
trktype:=GetInt(ptr,len); // 1-video,2-audio
if (tmp=2) and (trktype=2) then
break;
end
else if (id=idCodecPrivate) and (trktype=1) then
begin
inc(ptr,16);
// 4 - ? (40=size included?)
// width,height
// 2 - ?
// 2 - bitperpixel?
Info.codec:=ptr^; inc(ptr);
Info.codec:=Info.codec+(ptr^ shl 8 ); inc(ptr);
Info.codec:=Info.codec+(ptr^ shl 16); inc(ptr);
Info.codec:=Info.codec+(ptr^ shl 24);
inc(ptr,len-19);
end
else if (id=idName) and (Info.title=NIL) then
begin
mGetMem(ls,len+1);
move(ptr^,ls^,len);
ls[len]:=#0;
AnsiToWide(ls,Info.title);
mFreeMem(ls);
inc(ptr,len);
end
else if id=idPixelWidth then
Info.width:=GetInt(ptr,len)
else if id=idPixelHeight then
Info.height:=GetInt(ptr,len)
else if id=idDefaultDuration then
begin
if trktype=1 then
begin
Info.fps:=(GetInt(ptr,len) div 1000);
if Info.fps<>0 then
Info.fps:=100000000 div Info.fps;
end
else
begin
GetInt(ptr,len);
end;
end
else if id=idSamplingFrequency then
Info.khz:=round(GetFloat(ptr)) div 1000
else if id=idChannels then
Info.channels:=GetInt(ptr,len)
else
inc(ptr,len);
until pAnsiChar(ptr)>=(PAnsiChar(@buf)+SizeOf(buf));
Info.total:=trunc(lTotal/(1000000000/scale));
CloseHandle(f);
end;
var
LocalFormatLink:twFormat;
procedure InitLink;
begin
LocalFormatLink.Next:=FormatLink;
LocalFormatLink.This.proc :=@ReadMKV;
LocalFormatLink.This.ext :='MKV';
LocalFormatLink.This.flags:=WAT_OPT_VIDEO;
FormatLink:=@LocalFormatLink;
end;
initialization
InitLink;
end.
|
