git.sesse.net Git - nageru/blob - nageru/decklink/DeckLinkAPIDispatch.cpp

   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
  54 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
  81 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 bool            IsDeckLinkAPIPresent (void)
  97 {
  98         // If the DeckLink API dynamic library was successfully loaded, return this knowledge to the caller
  99         return gLoadedDeckLinkAPI;
 100 }
 101
 102 IDeckLinkIterator*              CreateDeckLinkIteratorInstance (void)
 103 {
 104         pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
 105
 106         if (gCreateIteratorFunc == NULL)
 107                 return NULL;
 108         return gCreateIteratorFunc();
 109 }
 110
 111 IDeckLinkAPIInformation*        CreateDeckLinkAPIInformationInstance (void)
 112 {
 113         pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
 114
 115         if (gCreateAPIInformationFunc == NULL)
 116                 return NULL;
 117         return gCreateAPIInformationFunc();
 118 }
 119
 120 IDeckLinkGLScreenPreviewHelper*         CreateOpenGLScreenPreviewHelper (void)
 121 {
 122         pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
 123         pthread_once(&gPreviewOnceControl, InitDeckLinkPreviewAPI);
 124
 125         if (gCreateOpenGLPreviewFunc == NULL)
 126                 return NULL;
 127         return gCreateOpenGLPreviewFunc();
 128 }
 129
 130 IDeckLinkVideoConversion* CreateVideoConversionInstance (void)
 131 {
 132         pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
 133
 134         if (gCreateVideoConversionFunc == NULL)
 135                 return NULL;
 136         return gCreateVideoConversionFunc();
 137 }
 138
 139 IDeckLinkDiscovery* CreateDeckLinkDiscoveryInstance (void)
 140 {
 141         pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
 142
 143         if (gCreateDeckLinkDiscoveryFunc == NULL)
 144                 return NULL;
 145         return gCreateDeckLinkDiscoveryFunc();
 146 }