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
43 static pthread_once_t gDeckLinkOnceControl = PTHREAD_ONCE_INIT;
44 static pthread_once_t gPreviewOnceControl = PTHREAD_ONCE_INIT;
45
46 static bool gLoadedDeckLinkAPI = false;
47
48 static CreateIteratorFunc gCreateIteratorFunc = NULL;
49 static CreateAPIInformationFunc gCreateAPIInformationFunc = NULL;
50 static CreateOpenGLScreenPreviewHelperFunc gCreateOpenGLPreviewFunc = NULL;
51 static CreateVideoConversionInstanceFunc gCreateVideoConversionFunc = NULL;
52 static CreateDeckLinkDiscoveryInstanceFunc gCreateDeckLinkDiscoveryFunc = NULL;
53
InitDeckLinkAPI(void)54 static void InitDeckLinkAPI (void)
55 {
56 void *libraryHandle;
57
58 libraryHandle = dlopen(kDeckLinkAPI_Name, RTLD_NOW|RTLD_GLOBAL);
59 if (!libraryHandle)
60 {
61 fprintf(stderr, "%s\n", dlerror());
62 return;
63 }
64
65 gLoadedDeckLinkAPI = true;
66
67 gCreateIteratorFunc = (CreateIteratorFunc)dlsym(libraryHandle, "CreateDeckLinkIteratorInstance_0002");
68 if (!gCreateIteratorFunc)
69 fprintf(stderr, "%s\n", dlerror());
70 gCreateAPIInformationFunc = (CreateAPIInformationFunc)dlsym(libraryHandle, "CreateDeckLinkAPIInformationInstance_0001");
71 if (!gCreateAPIInformationFunc)
72 fprintf(stderr, "%s\n", dlerror());
73 gCreateVideoConversionFunc = (CreateVideoConversionInstanceFunc)dlsym(libraryHandle, "CreateVideoConversionInstance_0001");
74 if (!gCreateVideoConversionFunc)
75 fprintf(stderr, "%s\n", dlerror());
76 gCreateDeckLinkDiscoveryFunc = (CreateDeckLinkDiscoveryInstanceFunc)dlsym(libraryHandle, "CreateDeckLinkDiscoveryInstance_0001");
77 if (!gCreateDeckLinkDiscoveryFunc)
78 fprintf(stderr, "%s\n", dlerror());
79 }
80
InitDeckLinkPreviewAPI(void)81 static void InitDeckLinkPreviewAPI (void)
82 {
83 void *libraryHandle;
84
85 libraryHandle = dlopen(KDeckLinkPreviewAPI_Name, RTLD_NOW|RTLD_GLOBAL);
86 if (!libraryHandle)
87 {
88 fprintf(stderr, "%s\n", dlerror());
89 return;
90 }
91 gCreateOpenGLPreviewFunc = (CreateOpenGLScreenPreviewHelperFunc)dlsym(libraryHandle, "CreateOpenGLScreenPreviewHelper_0001");
92 if (!gCreateOpenGLPreviewFunc)
93 fprintf(stderr, "%s\n", dlerror());
94 }
95
96 #if 0
97 bool IsDeckLinkAPIPresent (void)
98 {
99 // If the DeckLink API dynamic library was successfully loaded, return this knowledge to the caller
100 return gLoadedDeckLinkAPI;
101 }
102 #endif
103
CreateDeckLinkIteratorInstance(void)104 IDeckLinkIterator* CreateDeckLinkIteratorInstance (void)
105 {
106 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
107
108 if (gCreateIteratorFunc == NULL)
109 return NULL;
110 return gCreateIteratorFunc();
111 }
112
CreateDeckLinkAPIInformationInstance(void)113 IDeckLinkAPIInformation* CreateDeckLinkAPIInformationInstance (void)
114 {
115 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
116
117 if (gCreateAPIInformationFunc == NULL)
118 return NULL;
119 return gCreateAPIInformationFunc();
120 }
121
CreateOpenGLScreenPreviewHelper(void)122 IDeckLinkGLScreenPreviewHelper* CreateOpenGLScreenPreviewHelper (void)
123 {
124 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
125 pthread_once(&gPreviewOnceControl, InitDeckLinkPreviewAPI);
126
127 if (gCreateOpenGLPreviewFunc == NULL)
128 return NULL;
129 return gCreateOpenGLPreviewFunc();
130 }
131
CreateVideoConversionInstance(void)132 IDeckLinkVideoConversion* CreateVideoConversionInstance (void)
133 {
134 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
135
136 if (gCreateVideoConversionFunc == NULL)
137 return NULL;
138 return gCreateVideoConversionFunc();
139 }
140
CreateDeckLinkDiscoveryInstance(void)141 IDeckLinkDiscovery* CreateDeckLinkDiscoveryInstance (void)
142 {
143 pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
144
145 if (gCreateDeckLinkDiscoveryFunc == NULL)
146 return NULL;
147 return gCreateDeckLinkDiscoveryFunc();
148 }
149