media/wmf-clearkey/WMFClearKeyCDMFactory.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "WMFClearKeyCDMFactory.h"
   6
   7 #include <string>
   8
   9 #include <Mferror.h>
  10
  11 #include "WMFClearKeyCDMAccess.h"
  12 #include "WMFClearKeyUtils.h"
  13
  14 namespace mozilla {
  15
  16 using Microsoft::WRL::MakeAndInitialize;
  17
  18 ActivatableClass(WMFClearKeyCDMFactory);
  19
  20 bool isRequiringHDCP22OrAbove(LPCWSTR aType) {
  21   if (aType == nullptr || *aType == L'\0') {
  22     return false;
  23   }
  24
  25   // The HDCP value follows the feature value in
  26   // https://docs.microsoft.com/en-us/uwp/api/windows.media.protection.protectioncapabilities.istypesupported?view=winrt-19041
  27   // - 1 (on without HDCP 2.2 Type 1 restriction)
  28   // - 2 (on with HDCP 2.2 Type 1 restriction)
  29   std::wstring wstr(aType);
  30   std::string hdcpStr(wstr.begin(), wstr.end());
  31   return wstr.find(L"hdcp=2") != std::string::npos;
  32 }
  33
  34 STDMETHODIMP_(BOOL)
  35 WMFClearKeyCDMFactory::IsTypeSupported(_In_ LPCWSTR aKeySystem,
  36                                        _In_opt_ LPCWSTR aContentType) {
  37   // For testing, return support for most of cases. Only returns false for some
  38   // special cases.
  39
  40   bool needHDCP22OrAbove = isRequiringHDCP22OrAbove(aContentType);
  41   ENTRY_LOG_ARGS("Need-HDCP2.2+=%d", needHDCP22OrAbove);
  42
  43   // As the API design of the Media Foundation, we can only know whether the
  44   // requester is asking for HDCP 2.2+ or not, we can't know the exact HDCP
  45   // version which is used in getStatusPolicy web api. Therefore, we pretend
  46   // ourselves only having HDCP 2.1 compliant.
  47   if (needHDCP22OrAbove) {
  48     return false;
  49   }
  50   return true;
  51 }
  52
  53 STDMETHODIMP
  54 WMFClearKeyCDMFactory::CreateContentDecryptionModuleAccess(
  55     LPCWSTR aKeySystem, IPropertyStore** aConfigurations,
  56     DWORD aNumConfigurations, IMFContentDecryptionModuleAccess** aCdmAccess) {
  57   ENTRY_LOG();
  58   if (aKeySystem == nullptr || aKeySystem[0] == L'\0') {
  59     ENTRY_LOG_ARGS("Key system is null or empty");
  60     return MF_TYPE_ERR;
  61   }
  62
  63   if (aNumConfigurations == 0) {
  64     ENTRY_LOG_ARGS("No available configration");
  65     return MF_TYPE_ERR;
  66   }
  67
  68   if (!IsTypeSupported(aKeySystem, nullptr)) {
  69     ENTRY_LOG_ARGS("Not supported type");
  70     return MF_NOT_SUPPORTED_ERR;
  71   }
  72
  73   RETURN_IF_FAILED((
  74       MakeAndInitialize<WMFClearKeyCDMAccess, IMFContentDecryptionModuleAccess>(
  75           aCdmAccess)));
  76   ENTRY_LOG_ARGS("Created CDM access!");
  77   return S_OK;
  78 }
  79
  80 #undef LOG
  81
  82 }  // namespace mozilla