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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <dlfcn.h>
#include "AppleVTLinker.h"
#include "mozilla/ArrayUtils.h"
#include "nsDebug.h"
#define LOG(...) MOZ_LOG(sPDMLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
namespace mozilla {
AppleVTLinker::LinkStatus
AppleVTLinker::sLinkStatus = LinkStatus_INIT;
void* AppleVTLinker::sLink = nullptr;
CFStringRef AppleVTLinker::skPropEnableHWAccel = nullptr;
CFStringRef AppleVTLinker::skPropUsingHWAccel = nullptr;
#define LINK_FUNC(func) typeof(func) func;
#include "AppleVTFunctions.h"
#undef LINK_FUNC
/* static */ bool
AppleVTLinker::Link()
{
if (sLinkStatus) {
return sLinkStatus == LinkStatus_SUCCEEDED;
}
const char* dlnames[] =
{ "/System/Library/Frameworks/VideoToolbox.framework/VideoToolbox",
"/System/Library/PrivateFrameworks/VideoToolbox.framework/VideoToolbox" };
bool dlfound = false;
for (size_t i = 0; i < ArrayLength(dlnames); i++) {
if ((sLink = dlopen(dlnames[i], RTLD_NOW | RTLD_LOCAL))) {
dlfound = true;
break;
}
}
if (!dlfound) {
NS_WARNING("Couldn't load VideoToolbox framework");
goto fail;
}
#define LINK_FUNC(func) \
func = (typeof(func))dlsym(sLink, #func); \
if (!func) { \
NS_WARNING("Couldn't load VideoToolbox function " #func ); \
goto fail; \
}
#include "AppleVTFunctions.h"
#undef LINK_FUNC
// Will only resolve in 10.9 and later.
skPropEnableHWAccel =
GetIOConst("kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder");
skPropUsingHWAccel =
GetIOConst("kVTDecompressionPropertyKey_UsingHardwareAcceleratedVideoDecoder");
LOG("Loaded VideoToolbox framework.");
sLinkStatus = LinkStatus_SUCCEEDED;
return true;
fail:
Unlink();
sLinkStatus = LinkStatus_FAILED;
return false;
}
/* static */ void
AppleVTLinker::Unlink()
{
if (sLink) {
LOG("Unlinking VideoToolbox framework.");
#define LINK_FUNC(func) \
func = nullptr;
#include "AppleVTFunctions.h"
#undef LINK_FUNC
dlclose(sLink);
sLink = nullptr;
skPropEnableHWAccel = nullptr;
skPropUsingHWAccel = nullptr;
sLinkStatus = LinkStatus_INIT;
}
}
/* static */ CFStringRef
AppleVTLinker::GetIOConst(const char* symbol)
{
CFStringRef* address = (CFStringRef*)dlsym(sLink, symbol);
if (!address) {
return nullptr;
}
return *address;
}
} // namespace mozilla
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