зеркало из https://github.com/mozilla/gecko-dev.git
292 строки
8.9 KiB
C++
292 строки
8.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "ChromiumCDMAdapter.h"
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#include "content_decryption_module.h"
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#include "content_decryption_module_ext.h"
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#include "VideoUtils.h"
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#include "gmp-api/gmp-entrypoints.h"
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#include "gmp-api/gmp-video-codec.h"
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#include "WidevineUtils.h"
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#include "GMPLog.h"
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#include "mozilla/Move.h"
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#ifdef XP_WIN
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# include "WinUtils.h"
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# include "nsWindowsDllInterceptor.h"
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# include <windows.h>
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# include <strsafe.h>
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# include <unordered_map>
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# include <vector>
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#else
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# include <sys/types.h>
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# include <sys/stat.h>
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# include <unistd.h>
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# include <fcntl.h>
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#endif
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const GMPPlatformAPI* sPlatform = nullptr;
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namespace mozilla {
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#ifdef XP_WIN
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static void InitializeHooks();
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#endif
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ChromiumCDMAdapter::ChromiumCDMAdapter(
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nsTArray<Pair<nsCString, nsCString>>&& aHostPathPairs) {
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#ifdef XP_WIN
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InitializeHooks();
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#endif
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PopulateHostFiles(std::move(aHostPathPairs));
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}
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void ChromiumCDMAdapter::SetAdaptee(PRLibrary* aLib) { mLib = aLib; }
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void* ChromiumCdmHost(int aHostInterfaceVersion, void* aUserData) {
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GMP_LOG("ChromiumCdmHostFunc(%d, %p)", aHostInterfaceVersion, aUserData);
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if (aHostInterfaceVersion != cdm::Host_9::kVersion &&
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aHostInterfaceVersion != cdm::Host_10::kVersion) {
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return nullptr;
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}
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return aUserData;
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}
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#define STRINGIFY(s) _STRINGIFY(s)
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#define _STRINGIFY(s) #s
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#ifdef MOZILLA_OFFICIAL
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static cdm::HostFile TakeToCDMHostFile(HostFileData& aHostFileData) {
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return cdm::HostFile(aHostFileData.mBinary.Path().get(),
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aHostFileData.mBinary.TakePlatformFile(),
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aHostFileData.mSig.TakePlatformFile());
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}
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#endif
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GMPErr ChromiumCDMAdapter::GMPInit(const GMPPlatformAPI* aPlatformAPI) {
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GMP_LOG("ChromiumCDMAdapter::GMPInit");
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sPlatform = aPlatformAPI;
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if (!mLib) {
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return GMPGenericErr;
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}
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#ifdef MOZILLA_OFFICIAL
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// Note: we must call the VerifyCdmHost_0 function if it's present before
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// we call the initialize function.
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auto verify = reinterpret_cast<decltype(::VerifyCdmHost_0)*>(
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PR_FindFunctionSymbol(mLib, STRINGIFY(VerifyCdmHost_0)));
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if (verify) {
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nsTArray<cdm::HostFile> files;
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for (HostFileData& hostFile : mHostFiles) {
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files.AppendElement(TakeToCDMHostFile(hostFile));
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}
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bool result = verify(files.Elements(), files.Length());
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GMP_LOG("%s VerifyCdmHost_0 returned %d", __func__, result);
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}
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#endif
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auto init = reinterpret_cast<decltype(::INITIALIZE_CDM_MODULE)*>(
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PR_FindFunctionSymbol(mLib, STRINGIFY(INITIALIZE_CDM_MODULE)));
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if (!init) {
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return GMPGenericErr;
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}
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GMP_LOG(STRINGIFY(INITIALIZE_CDM_MODULE) "()");
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init();
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return GMPNoErr;
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}
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GMPErr ChromiumCDMAdapter::GMPGetAPI(const char* aAPIName, void* aHostAPI,
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void** aPluginAPI, uint32_t aDecryptorId) {
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GMP_LOG("ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p, %u) this=0x%p",
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aAPIName, aHostAPI, aPluginAPI, aDecryptorId, this);
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bool isCDM10 = !strcmp(aAPIName, CHROMIUM_CDM_API);
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bool isCDM9 = !strcmp(aAPIName, CHROMIUM_CDM_API_BACKWARD_COMPAT);
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if (isCDM9 || isCDM10) {
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auto create = reinterpret_cast<decltype(::CreateCdmInstance)*>(
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PR_FindFunctionSymbol(mLib, "CreateCdmInstance"));
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if (!create) {
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GMP_LOG(
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"ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p, %u) this=0x%p "
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"FAILED to find CreateCdmInstance",
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aAPIName, aHostAPI, aPluginAPI, aDecryptorId, this);
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return GMPGenericErr;
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}
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int version = isCDM9 ? cdm::ContentDecryptionModule_9::kVersion
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: cdm::ContentDecryptionModule_10::kVersion;
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void* cdm =
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create(version, kEMEKeySystemWidevine.get(),
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kEMEKeySystemWidevine.Length(), &ChromiumCdmHost, aHostAPI);
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if (!cdm) {
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GMP_LOG(
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"ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p, %u) this=0x%p "
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"FAILED to create cdm version %d",
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aAPIName, aHostAPI, aPluginAPI, aDecryptorId, this, version);
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return GMPGenericErr;
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}
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GMP_LOG("cdm: 0x%p, version: %d", cdm, version);
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*aPluginAPI = cdm;
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}
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return *aPluginAPI ? GMPNoErr : GMPNotImplementedErr;
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}
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void ChromiumCDMAdapter::GMPShutdown() {
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GMP_LOG("ChromiumCDMAdapter::GMPShutdown()");
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decltype(::DeinitializeCdmModule)* deinit;
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deinit =
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(decltype(deinit))(PR_FindFunctionSymbol(mLib, "DeinitializeCdmModule"));
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if (deinit) {
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GMP_LOG("DeinitializeCdmModule()");
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deinit();
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}
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}
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/* static */
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bool ChromiumCDMAdapter::Supports(int32_t aModuleVersion,
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int32_t aInterfaceVersion,
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int32_t aHostVersion) {
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return aModuleVersion == CDM_MODULE_VERSION &&
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(aInterfaceVersion == cdm::ContentDecryptionModule_9::kVersion ||
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aInterfaceVersion == cdm::ContentDecryptionModule_10::kVersion) &&
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(aHostVersion == cdm::Host_9::kVersion ||
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aHostVersion == cdm::Host_10::kVersion);
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}
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#ifdef XP_WIN
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static WindowsDllInterceptor sKernel32Intercept;
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typedef DWORD(WINAPI* QueryDosDeviceWFnPtr)(_In_opt_ LPCWSTR lpDeviceName,
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_Out_ LPWSTR lpTargetPath,
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_In_ DWORD ucchMax);
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static WindowsDllInterceptor::FuncHookType<QueryDosDeviceWFnPtr>
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sOriginalQueryDosDeviceWFnPtr;
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static std::unordered_map<std::wstring, std::wstring>* sDeviceNames = nullptr;
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DWORD WINAPI QueryDosDeviceWHook(LPCWSTR lpDeviceName, LPWSTR lpTargetPath,
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DWORD ucchMax) {
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if (!sDeviceNames) {
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return 0;
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}
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std::wstring name = std::wstring(lpDeviceName);
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auto iter = sDeviceNames->find(name);
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if (iter == sDeviceNames->end()) {
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return 0;
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}
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const std::wstring& device = iter->second;
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if (device.size() + 1 > ucchMax) {
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return 0;
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}
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PodCopy(lpTargetPath, device.c_str(), device.size());
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lpTargetPath[device.size()] = 0;
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GMP_LOG("QueryDosDeviceWHook %S -> %S", lpDeviceName, lpTargetPath);
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return name.size();
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}
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static std::vector<std::wstring> GetDosDeviceNames() {
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std::vector<std::wstring> v;
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std::vector<wchar_t> buf;
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buf.resize(1024);
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DWORD rv = GetLogicalDriveStringsW(buf.size(), buf.data());
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if (rv == 0 || rv > buf.size()) {
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return v;
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}
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// buf will be a list of null terminated strings, with the last string
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// being 0 length.
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const wchar_t* p = buf.data();
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const wchar_t* end = &buf.back();
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size_t l;
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while (p < end && (l = wcsnlen_s(p, end - p)) > 0) {
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// The string is of the form "C:\". We need to strip off the trailing
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// backslash.
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std::wstring drive = std::wstring(p, p + l);
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if (drive.back() == '\\') {
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drive.erase(drive.end() - 1);
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}
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v.push_back(move(drive));
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p += l + 1;
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}
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return v;
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}
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static std::wstring GetDeviceMapping(const std::wstring& aDosDeviceName) {
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wchar_t buf[MAX_PATH] = {0};
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DWORD rv = QueryDosDeviceW(aDosDeviceName.c_str(), buf, MAX_PATH);
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if (rv == 0) {
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return std::wstring(L"");
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}
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return std::wstring(buf, buf + rv);
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}
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static void InitializeHooks() {
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static bool initialized = false;
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if (initialized) {
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return;
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}
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initialized = true;
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sDeviceNames = new std::unordered_map<std::wstring, std::wstring>();
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for (const std::wstring& name : GetDosDeviceNames()) {
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sDeviceNames->emplace(name, GetDeviceMapping(name));
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}
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sKernel32Intercept.Init("kernelbase.dll");
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sOriginalQueryDosDeviceWFnPtr.Set(sKernel32Intercept, "QueryDosDeviceW",
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&QueryDosDeviceWHook);
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}
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#endif
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HostFile::HostFile(HostFile&& aOther)
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: mPath(aOther.mPath), mFile(aOther.TakePlatformFile()) {}
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HostFile::~HostFile() {
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if (mFile != cdm::kInvalidPlatformFile) {
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#ifdef XP_WIN
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CloseHandle(mFile);
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#else
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close(mFile);
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#endif
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mFile = cdm::kInvalidPlatformFile;
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}
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}
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#ifdef XP_WIN
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HostFile::HostFile(const nsCString& aPath)
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: mPath(NS_ConvertUTF8toUTF16(aPath)) {
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HANDLE handle =
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CreateFileW(mPath.get(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL, OPEN_EXISTING, 0, NULL);
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mFile = (handle == INVALID_HANDLE_VALUE) ? cdm::kInvalidPlatformFile : handle;
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}
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#endif
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#ifndef XP_WIN
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HostFile::HostFile(const nsCString& aPath) : mPath(aPath) {
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// Note: open() returns -1 on failure; i.e. kInvalidPlatformFile.
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mFile = open(aPath.get(), O_RDONLY);
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}
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#endif
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cdm::PlatformFile HostFile::TakePlatformFile() {
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cdm::PlatformFile f = mFile;
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mFile = cdm::kInvalidPlatformFile;
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return f;
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}
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void ChromiumCDMAdapter::PopulateHostFiles(
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nsTArray<Pair<nsCString, nsCString>>&& aHostPathPairs) {
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for (const auto& pair : aHostPathPairs) {
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mHostFiles.AppendElement(HostFileData(mozilla::HostFile(pair.first()),
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mozilla::HostFile(pair.second())));
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}
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}
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} // namespace mozilla
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