gstreamer/sys/decklink/DeckLinkAPIDispatch.cpp

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/* -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"
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typedef IDeckLinkIterator *(*CreateIteratorFunc) (void);
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typedef IDeckLinkAPIInformation *(*CreateAPIInformationFunc) (void);
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typedef IDeckLinkGLScreenPreviewHelper
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*(*CreateOpenGLScreenPreviewHelperFunc) (void);
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typedef IDeckLinkVideoConversion *(*CreateVideoConversionInstanceFunc) (void);
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static pthread_once_t gDeckLinkOnceControl = PTHREAD_ONCE_INIT;
static pthread_once_t gPreviewOnceControl = PTHREAD_ONCE_INIT;
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static bool gLoadedDeckLinkAPI = false;
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static CreateIteratorFunc gCreateIteratorFunc = NULL;
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static CreateAPIInformationFunc gCreateAPIInformationFunc = NULL;
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static CreateOpenGLScreenPreviewHelperFunc gCreateOpenGLPreviewFunc = NULL;
static CreateVideoConversionInstanceFunc gCreateVideoConversionFunc = NULL;
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void InitDeckLinkAPI (void);
void
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InitDeckLinkAPI (void)
{
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void *libraryHandle;
libraryHandle = dlopen (kDeckLinkAPI_Name, RTLD_NOW | RTLD_GLOBAL);
if (!libraryHandle) {
fprintf (stderr, "%s\n", dlerror ());
return;
}
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gLoadedDeckLinkAPI = true;
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gCreateIteratorFunc =
(CreateIteratorFunc) dlsym (libraryHandle,
"CreateDeckLinkIteratorInstance_0001");
if (!gCreateIteratorFunc)
fprintf (stderr, "%s\n", dlerror ());
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gCreateAPIInformationFunc =
(CreateAPIInformationFunc) dlsym (libraryHandle,
"CreateDeckLinkAPIInformationInstance_0001");
if (!gCreateAPIInformationFunc)
fprintf (stderr, "%s\n", dlerror ());
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gCreateVideoConversionFunc =
(CreateVideoConversionInstanceFunc) dlsym (libraryHandle,
"CreateVideoConversionInstance_0001");
if (!gCreateVideoConversionFunc)
fprintf (stderr, "%s\n", dlerror ());
}
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void InitDeckLinkPreviewAPI (void);
void
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InitDeckLinkPreviewAPI (void)
{
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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 ());
}
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bool IsDeckLinkAPIPresent (void);
bool
IsDeckLinkAPIPresent (void)
{
// If the DeckLink API dynamic library was successfully loaded, return this knowledge to the caller
return gLoadedDeckLinkAPI;
}
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IDeckLinkIterator *
CreateDeckLinkIteratorInstance (void)
{
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pthread_once (&gDeckLinkOnceControl, InitDeckLinkAPI);
if (gCreateIteratorFunc == NULL)
return NULL;
return gCreateIteratorFunc ();
}
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IDeckLinkAPIInformation *
CreateDeckLinkAPIInformationInstance (void)
{
pthread_once (&gDeckLinkOnceControl, InitDeckLinkAPI);
if (gCreateAPIInformationFunc == NULL)
return NULL;
return gCreateAPIInformationFunc ();
}
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IDeckLinkGLScreenPreviewHelper *
CreateOpenGLScreenPreviewHelper (void)
{
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pthread_once (&gDeckLinkOnceControl, InitDeckLinkAPI);
pthread_once (&gPreviewOnceControl, InitDeckLinkPreviewAPI);
if (gCreateOpenGLPreviewFunc == NULL)
return NULL;
return gCreateOpenGLPreviewFunc ();
}
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IDeckLinkVideoConversion *
CreateVideoConversionInstance (void)
{
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pthread_once (&gDeckLinkOnceControl, InitDeckLinkAPI);
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if (gCreateVideoConversionFunc == NULL)
return NULL;
return gCreateVideoConversionFunc ();
}