source: trunk/src/testing/app/DecklinkCapture/include/DeckLinkAPIDispatch.cpp @ 4

/* -LICENSE-START-
** Copyright (c) 2009 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.h"

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

typedef IDeckLinkIterator* (*CreateIteratorFunc)(void);
typedef IDeckLinkGLScreenPreviewHelper* (*CreateOpenGLScreenPreviewHelperFunc)(void);

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

static CreateIteratorFunc                               gCreateIteratorFunc = NULL;
static CreateOpenGLScreenPreviewHelperFunc      gCreateOpenGLPreviewFunc = NULL;

void    InitDeckLinkAPI (void)
{
        void *libraryHandle;
        
        libraryHandle = dlopen(kDeckLinkAPI_Name, RTLD_NOW|RTLD_GLOBAL);
        if (!libraryHandle)
        {
                fprintf(stderr, "%s\n", dlerror());
                return;
        }
        gCreateIteratorFunc = (CreateIteratorFunc)dlsym(libraryHandle, "CreateDeckLinkIteratorInstance");
        if (!gCreateIteratorFunc)
                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");
        if (!gCreateOpenGLPreviewFunc)
                fprintf(stderr, "%s\n", dlerror());
}

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

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