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