1 /* -LICENSE-START-
2 ** Copyright (c) 2009 Blackmagic Design
3 **
4 ** Permission is hereby granted, free of charge, to any person or organization
5 ** obtaining a copy of the software and accompanying documentation covered by
6 ** this license (the "Software") to use, reproduce, display, distribute,
7 ** execute, and transmit the Software, and to prepare derivative works of the
8 ** Software, and to permit third-parties to whom the Software is furnished to
9 ** do so, all subject to the following:
10 **
11 ** The copyright notices in the Software and this entire statement, including
12 ** the above license grant, this restriction and the following disclaimer,
13 ** must be included in all copies of the Software, in whole or in part, and
14 ** all derivative works of the Software, unless such copies or derivative
15 ** works are solely in the form of machine-executable object code generated by
16 ** a source language processor.
17 **
18 ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 ** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 ** FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
21 ** SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
22 ** FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
23 ** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24 ** DEALINGS IN THE SOFTWARE.
25 ** -LICENSE-END-
26 **/
27
28 #include <stdio.h>
29 #include <pthread.h>
30 #include <dlfcn.h>
31
32 #include "DeckLinkAPI.h"
33
34 #define kDeckLinkAPI_Name "libDeckLinkAPI.so"
35 #define KDeckLinkPreviewAPI_Name "libDeckLinkPreviewAPI.so"
36
37 typedef IDeckLinkIterator* (*CreateIteratorFunc)(void);
38 typedef IDeckLinkAPIInformation* (*CreateAPIInformationFunc)(void);
39 typedef IDeckLinkGLScreenPreviewHelper* (*CreateOpenGLScreenPreviewHelperFunc)(void);
40 typedef IDeckLinkVideoConversion* (*CreateVideoConversionInstanceFunc)(void);
41 typedef IDeckLinkDiscovery* (*CreateDeckLinkDiscoveryInstanceFunc)(void);
42 typedef IDeckLinkVideoFrameAncillaryPackets* (*CreateVideoFrameAncillaryPacketsInstanceFunc)(void);
43
44 static pthread_once_t gDeckLinkOnceControl = PTHREAD_ONCE_INIT;
45 static pthread_once_t gPreviewOnceControl = PTHREAD_ONCE_INIT;
46
47 static bool gLoadedDeckLinkAPI = false;
48
49 static CreateIteratorFunc gCreateIteratorFunc = NULL;
50 static CreateAPIInformationFunc gCreateAPIInformationFunc = NULL;
51 static CreateOpenGLScreenPreviewHelperFunc gCreateOpenGLPreviewFunc = NULL;
52 static CreateVideoConversionInstanceFunc gCreateVideoConversionFunc = NULL;
53 static CreateDeckLinkDiscoveryInstanceFunc gCreateDeckLinkDiscoveryFunc = NULL;
54 static CreateVideoFrameAncillaryPacketsInstanceFunc gCreateVideoFrameAncillaryPacketsFunc = NULL;
55
InitDeckLinkAPI(void)56 static void InitDeckLinkAPI (void)
57 {
58 void *libraryHandle;
59
60 libraryHandle = dlopen(kDeckLinkAPI_Name, RTLD_NOW|RTLD_GLOBAL);
61 if (!libraryHandle)
62 {
63 // fprintf(stderr, "%s\n", dlerror());
64 return;
65 }
66
67 gLoadedDeckLinkAPI = true;
68
69 gCreateIteratorFunc = (CreateIteratorFunc)dlsym(libraryHandle, "CreateDeckLinkIteratorInstance_0004");
70 if (!gCreateIteratorFunc)
71 fprintf(stderr, "%s\n", dlerror());
72 gCreateAPIInformationFunc = (CreateAPIInformationFunc)dlsym(libraryHandle, "CreateDeckLinkAPIInformationInstance_0001");
73 if (!gCreateAPIInformationFunc)
74 fprintf(stderr, "%s\n", dlerror());
75 gCreateVideoConversionFunc = (CreateVideoConversionInstanceFunc)dlsym(libraryHandle, "CreateVideoConversionInstance_0001");
76 if (!gCreateVideoConversionFunc)
77 fprintf(stderr, "%s\n", dlerror());
78 gCreateDeckLinkDiscoveryFunc = (CreateDeckLinkDiscoveryInstanceFunc)dlsym(libraryHandle, "CreateDeckLinkDiscoveryInstance_0003");
79 if (!gCreateDeckLinkDiscoveryFunc)
80 fprintf(stderr, "%s\n", dlerror());
81 gCreateVideoFrameAncillaryPacketsFunc = (CreateVideoFrameAncillaryPacketsInstanceFunc)dlsym(libraryHandle, "CreateVideoFrameAncillaryPacketsInstance_0001");
82 if (!gCreateVideoFrameAncillaryPacketsFunc)
83 fprintf(stderr, "%s\n", dlerror());
84 }
85
InitDeckLinkPreviewAPI(void)86 static void InitDeckLinkPreviewAPI (void)
87 {
88 void *libraryHandle;
89
90 libraryHandle = dlopen(KDeckLinkPreviewAPI_Name, RTLD_NOW|RTLD_GLOBAL);
91 if (!libraryHandle)
92 {
93 fprintf(stderr, "%s\n", dlerror());
94 return;
95 }
96 gCreateOpenGLPreviewFunc = (CreateOpenGLScreenPreviewHelperFunc)dlsym(libraryHandle, "CreateOpenGLScreenPreviewHelper_0001");
97 if (!gCreateOpenGLPreviewFunc)
98 fprintf(stderr, "%s\n", dlerror());
99 }
100
101 #if 0
102 bool IsDeckLinkAPIPresent (void)
103 {
104 // If the DeckLink API dynamic library was successfully loaded, return this knowledge to the caller
105 return gLoadedDeckLinkAPI;
106 }
107 #endif
108
CreateDeckLinkIteratorInstance(void)109 IDeckLinkIterator* CreateDeckLinkIteratorInstance (void)
110 {
111 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
112
113 if (gCreateIteratorFunc == NULL)
114 return NULL;
115 return gCreateIteratorFunc();
116 }
117
CreateDeckLinkAPIInformationInstance(void)118 IDeckLinkAPIInformation* CreateDeckLinkAPIInformationInstance (void)
119 {
120 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
121
122 if (gCreateAPIInformationFunc == NULL)
123 return NULL;
124 return gCreateAPIInformationFunc();
125 }
126
CreateOpenGLScreenPreviewHelper(void)127 IDeckLinkGLScreenPreviewHelper* CreateOpenGLScreenPreviewHelper (void)
128 {
129 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
130 pthread_once(&gPreviewOnceControl, InitDeckLinkPreviewAPI);
131
132 if (gCreateOpenGLPreviewFunc == NULL)
133 return NULL;
134 return gCreateOpenGLPreviewFunc();
135 }
136
CreateVideoConversionInstance(void)137 IDeckLinkVideoConversion* CreateVideoConversionInstance (void)
138 {
139 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
140
141 if (gCreateVideoConversionFunc == NULL)
142 return NULL;
143 return gCreateVideoConversionFunc();
144 }
145
CreateDeckLinkDiscoveryInstance(void)146 IDeckLinkDiscovery* CreateDeckLinkDiscoveryInstance (void)
147 {
148 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
149
150 if (gCreateDeckLinkDiscoveryFunc == NULL)
151 return NULL;
152 return gCreateDeckLinkDiscoveryFunc();
153 }
154
CreateVideoFrameAncillaryPacketsInstance(void)155 IDeckLinkVideoFrameAncillaryPackets* CreateVideoFrameAncillaryPacketsInstance (void)
156 {
157 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
158
159 if (gCreateVideoFrameAncillaryPacketsFunc == NULL)
160 return NULL;
161 return gCreateVideoFrameAncillaryPacketsFunc();
162 }
163