Aegisub/src/avisynth_wrap.cpp

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// Copyright (c) 2005, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Aegisub Project http://www.aegisub.org/
/// @file avisynth_wrap.cpp
/// @brief Wrapper-layer for Avisynth
/// @ingroup video_input audio_input
///
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#ifdef WITH_AVISYNTH
#include "avisynth_wrap.h"
#include "avisynth.h"
#include "options.h"
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#include <mutex>
#ifndef _WIN32
#include <dlfcn.h>
#endif
#ifdef _WIN32
#define AVISYNTH_SO "avisynth.dll"
#else
#define AVISYNTH_SO "libavisynth.so"
#endif
// Allocate storage for and initialise static members
namespace {
int avs_refcount = 0;
bool failed = false;
#ifdef _WIN32
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HINSTANCE hLib = nullptr;
#else
void* hLib = nullptr;
#endif
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IScriptEnvironment *env = nullptr;
std::mutex AviSynthMutex;
}
// This needs to be visible so Avisynth sees it
const AVS_Linkage *AVS_linkage = nullptr;
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typedef IScriptEnvironment* __stdcall FUNC(int);
AviSynthWrapper::AviSynthWrapper() try {
if (!avs_refcount++) {
#ifdef _WIN32
#define CONCATENATE(x, y) x ## y
#define _Lstr(x) CONCATENATE(L, x)
hLib = LoadLibraryW(_Lstr(AVISYNTH_SO));
#undef _Lstr
#undef CONCATENATE
#else
hLib = dlopen(AVISYNTH_SO, RTLD_LAZY | RTLD_LOCAL | RTLD_DEEPBIND);
#endif
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if (!hLib)
throw AvisynthError("Could not load " AVISYNTH_SO);
#ifdef _WIN32
FUNC* CreateScriptEnv = (FUNC*)GetProcAddress(hLib, "CreateScriptEnvironment");
#else
FUNC* CreateScriptEnv = (FUNC*)dlsym(hLib, "CreateScriptEnvironment");
#endif
if (!CreateScriptEnv)
throw AvisynthError("Failed to get address of CreateScriptEnv from " AVISYNTH_SO);
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env = CreateScriptEnv(AVISYNTH_INTERFACE_VERSION);
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if (!env)
throw AvisynthError("Failed to create a new avisynth script environment. Avisynth is too old?");
AVS_linkage = env->GetAVSLinkage();
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// Set memory limit
const int memoryMax = OPT_GET("Provider/Avisynth/Memory Max")->GetInt();
if (memoryMax)
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env->SetMemoryMax(memoryMax);
}
} catch (AvisynthError const&) {
avs_refcount--;
throw;
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}
AviSynthWrapper::~AviSynthWrapper() {
if (!--avs_refcount) {
env->DeleteScriptEnvironment();
#ifdef _WIN32
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FreeLibrary(hLib);
#else
dlclose(hLib);
#endif
AVS_linkage = nullptr;
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}
}
std::mutex& AviSynthWrapper::GetMutex() const {
return AviSynthMutex;
}
IScriptEnvironment *AviSynthWrapper::GetEnv() const {
return env;
}
#endif