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DeckLinkAPIDispatch_v8_0.cpp
/* -LICENSE-START-
** Copyright (c) 2011 Blackmagic Design
**
** Permission is hereby granted, free of charge, to any person or organization
** obtaining a copy of the software and accompanying documentation covered by
** this license (the "Software") to use, reproduce, display, distribute,
** execute, and transmit the Software, and to prepare derivative works of the
** Software, and to permit third-parties to whom the Software is furnished to
** do so, all subject to the following:
** 
** The copyright notices in the Software and this entire statement, including
** the above license grant, this restriction and the following disclaimer,
** must be included in all copies of the Software, in whole or in part, and
** all derivative works of the Software, unless such copies or derivative
** works are solely in the form of machine-executable object code generated by
** a source language processor.
** 
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
** SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
** FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
** DEALINGS IN THE SOFTWARE.
** -LICENSE-END-
**/

#include <stdio.h>
#include <pthread.h>
#include <dlfcn.h>

#include "DeckLinkAPI_v8_0.h"

#define kDeckLinkAPI_Name "libDeckLinkAPI.so"
#define KDeckLinkPreviewAPI_Name "libDeckLinkPreviewAPI.so"

typedef IDeckLinkIterator_v8_0* (*CreateIteratorFunc)(void);
typedef IDeckLinkAPIInformation* (*CreateAPIInformationFunc)(void);
typedef IDeckLinkGLScreenPreviewHelper* (*CreateOpenGLScreenPreviewHelperFunc)(void);
typedef IDeckLinkVideoConversion* (*CreateVideoConversionInstanceFunc)(void);

static pthread_once_t                           gDeckLinkOnceControl = PTHREAD_ONCE_INIT;
static pthread_once_t                           gPreviewOnceControl = PTHREAD_ONCE_INIT;

static bool                                           gLoadedDeckLinkAPI = false;

static CreateIteratorFunc                             gCreateIteratorFunc = NULL;
static CreateAPIInformationFunc                       gCreateAPIInformationFunc = NULL;
static CreateOpenGLScreenPreviewHelperFunc      gCreateOpenGLPreviewFunc = NULL;
static CreateVideoConversionInstanceFunc  gCreateVideoConversionFunc    = NULL;

void  InitDeckLinkAPI (void)
{
      void *libraryHandle;
      
      libraryHandle = dlopen(kDeckLinkAPI_Name, RTLD_NOW|RTLD_GLOBAL);
      if (!libraryHandle)
      {
            fprintf(stderr, "%s\n", dlerror());
            return;
      }
      
      gLoadedDeckLinkAPI = true;
      
      gCreateIteratorFunc = (CreateIteratorFunc)dlsym(libraryHandle, "CreateDeckLinkIteratorInstance_0001");
      if (!gCreateIteratorFunc)
            fprintf(stderr, "%s\n", dlerror());
      gCreateAPIInformationFunc = (CreateAPIInformationFunc)dlsym(libraryHandle, "CreateDeckLinkAPIInformationInstance_0001");
      if (!gCreateAPIInformationFunc)
            fprintf(stderr, "%s\n", dlerror());
      gCreateVideoConversionFunc = (CreateVideoConversionInstanceFunc)dlsym(libraryHandle, "CreateVideoConversionInstance_0001");
      if (!gCreateVideoConversionFunc)
            fprintf(stderr, "%s\n", dlerror());
}

void  InitDeckLinkPreviewAPI (void)
{
      void *libraryHandle;
      
      libraryHandle = dlopen(KDeckLinkPreviewAPI_Name, RTLD_NOW|RTLD_GLOBAL);
      if (!libraryHandle)
      {
            fprintf(stderr, "%s\n", dlerror());
            return;
      }
      gCreateOpenGLPreviewFunc = (CreateOpenGLScreenPreviewHelperFunc)dlsym(libraryHandle, "CreateOpenGLScreenPreviewHelper_0001");
      if (!gCreateOpenGLPreviewFunc)
            fprintf(stderr, "%s\n", dlerror());
}

bool        IsDeckLinkAPIPresent (void)
{
      // If the DeckLink API dynamic library was successfully loaded, return this knowledge to the caller
      return gLoadedDeckLinkAPI;
}

IDeckLinkIterator_v8_0*       CreateDeckLinkIteratorInstance (void)
{
      pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
      
      if (gCreateIteratorFunc == NULL)
            return NULL;
      return gCreateIteratorFunc();
}

IDeckLinkAPIInformation*      CreateDeckLinkAPIInformationInstance (void)
{
      pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
      
      if (gCreateAPIInformationFunc == NULL)
            return NULL;
      return gCreateAPIInformationFunc();
}

IDeckLinkGLScreenPreviewHelper*           CreateOpenGLScreenPreviewHelper (void)
{
      pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
      pthread_once(&gPreviewOnceControl, InitDeckLinkPreviewAPI);
      
      if (gCreateOpenGLPreviewFunc == NULL)
            return NULL;
      return gCreateOpenGLPreviewFunc();
}

IDeckLinkVideoConversion* CreateVideoConversionInstance (void)
{
      pthread_once(&gDeckLinkOnceControl, InitDeckLinkAPI);
      
      if (gCreateVideoConversionFunc == NULL)
            return NULL;
      return gCreateVideoConversionFunc();
}


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