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
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
unit UWebCam;
interface
uses
math,
gl,
glu,
glext,
SysUtils,
UIni,
UTime,
SDL,
UCaptureWDM;
function wStartWebCam: boolean;
procedure wStopWebCam;
procedure wInit;
procedure wClose;
procedure wDraw(DoDraw: boolean; Screen: integer);
var
WebCamReady: boolean;
FGrabFrameFlag : boolean;
FTex: glUint;
FTexX, FTexY: integer;
FdataX, FdataY: integer;
FrameDataPtr: PByteArray;
frame: Pointer;
WDMSample: TSampleClass;
implementation
uses
UGraphic,
ULog,
UDisplay;
function wStartWebCam(): boolean;
begin
if not WebCamReady then
wInit();
Result := WebCamReady;
if WebCamReady and not FGrabFrameFlag then
begin
glBindTexture(GL_TEXTURE_2D, FTex);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, FTexX, FTexY,
GL_BGR, GL_UNSIGNED_BYTE, @FrameDataPtr[0]);
glBindTexture(GL_TEXTURE_2D, 0);
FGrabFrameFlag := true;
WDMSample.Start;
end;
end;
procedure wStopWebCam();
begin
if WebCamReady and FGrabFrameFlag then
begin
FGrabFrameFlag := false;
WDMSample.Stop;
end;
end;
procedure wInit;
const
width = 320;
height = 240;
var
IWebCamDevice: TList;
begin
if WebCamReady then
exit;
WebCamReady := false;
if(Ini.EnableWebCam=0) then
exit;
GetCapDevices(IWebCamDevice);
if (Length(IWebCamDevice)-1 < Ini.WebCamID) then
Exit;
try
WDMSample := TSampleClass.Create(Ini.WebCamID, Ini.WebCamMediaID);
except
wClose;
Log.LogError('Error init WDM (UWebCam.wInitWDM)');
Exit;
end;
FTexX := width;
FTexY := height;
FdataX := Round(Power(2, Ceil(Log2(FTexX))));
FdataY := Round(Power(2, Ceil(Log2(FTexY))));
FrameDataPtr:=WDMSample.FramePtr;
glGenTextures(1, @FTex);
glBindTexture(GL_TEXTURE_2D, FTex);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_PRIORITY, 1.0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 3, FdataX, FdataY, 0,
GL_BGR, GL_UNSIGNED_BYTE, nil);
glBindTexture(GL_TEXTURE_2D, 0);
FGrabFrameFlag := false;
WebCamReady := true;
end;
procedure UploadNewFrame;
begin
if (not WDMSample.CapStatus) then
exit;
FrameDataPtr := WDMSample.FramePtr;
if (FTexX<>WDMSample.GetWidth) or (FTexY<>WDMSample.GetHeight) then
begin
FTexX := WDMSample.GetWidth;
FTexY := WDMSample.GetHeight;
FdataX := Round(Power(2, Ceil(Log2(FTexX))));
FdataY := Round(Power(2, Ceil(Log2(FTexY))));
glGenTextures(1, @FTex);
glBindTexture(GL_TEXTURE_2D, FTex);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_PRIORITY, 1.0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 3, FdataX, FdataY, 0,
GL_BGR, GL_UNSIGNED_BYTE, nil);
glBindTexture(GL_TEXTURE_2D, 0);
end;
glBindTexture(GL_TEXTURE_2D, FTex);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, FTexX, FTexY,
GL_BGR, GL_UNSIGNED_BYTE, @FrameDataPtr[0]);
glBindTexture(GL_TEXTURE_2D, 0);
WDMSample.TriggerCapture;
end;
procedure wDraw(DoDraw: boolean; Screen: integer);
var
SRect: record
left, right, upper, lower: double;
end;
ScreenAspect: double;
CamAspect: double;
ScaledVideoWidth: double;
ScaledVideoHeight: double;
begin
if not WebCamReady then
exit;
if DoDraw then
begin
try
UploadNewFrame;
except
wClose;
Log.LogError('Error Uploading new Frame (UWebCam.wDraw)');
Exit;
end;
end else
Exit;
ScreenAspect := (ScreenW/Screens) / ScreenH;
CamAspect := FTexX/FTexY;
if (ScreenAspect >= 1) then
begin
ScaledVideoWidth := RenderW;
ScaledVideoHeight := RenderH * ScreenAspect/CamAspect;
end else
begin
ScaledVideoHeight := RenderH;
ScaledVideoWidth := RenderW * CamAspect/ScreenAspect;
end;
SRect.left := (RenderW - ScaledVideoWidth) / 2;
SRect.right := SRect.left + ScaledVideoWidth;
SRect.lower := (RenderH - ScaledVideoHeight) / 2;
SRect.upper := SRect.lower + ScaledVideoHeight;
if (Screen=1) then
begin
glClearColor(0,0,0,1);
glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
end;
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glColor4f(1, 1, 1, 1);
glBindTexture(GL_TEXTURE_2D, FTex);
glbegin(gl_quads);
// upper-left coord
glTexCoord2f(FTexX/FdataX, 0);
glVertex2f(SRect.left, SRect.upper);
// lower-left coord
glTexCoord2f(FTexX/FdataX, FTexY/FdataY);
glVertex2f(SRect.left, SRect.lower);
// lower-right coord
glTexCoord2f(0, FTexY/FdataY);
glVertex2f(SRect.Right, SRect.lower);
// upper-right coord
glTexCoord2f(0, 0);
glVertex2f(SRect.Right, SRect.upper);
glEnd;
glDisable(GL_BLEND);
end;
procedure wClose();
begin
WebCamReady := false;
FGrabFrameFlag := false;
if (WDMSample<>nil) then
begin
WDMSample.Terminate;
WDMSample.WaitFor;
WDMSample.Free;
WDMSample := nil;
end;
if(frame<>nil) then
FreeMem(frame);
frame := nil;
WebCamReady := false;
glDeleteTextures(1, @FTex);
end;
end.
|
