受保护的用户模式音频 (PUMA)
Windows Vista 引入了受保护的用户模式音频 (PUMA)，这是受保护环境 (PE) 中的用户模式音频引擎，可提供更安全的音频处理和呈现环境。 它只允许启用可接受的音频输出，并确保能够可靠地禁用输出。 有关 PUMA 的详细信息，请参阅输出内容保护和 Windows Vista。
PUMA 已针对 Windows 7 进行了更新以提供以下功能：
- 在 S/PDIF 终结点上设置串行复制管理系统 (SCMS) 位，并在高清多媒体接口 (HDMI) 终结点上设置高带宽数字内容保护 (HDCP) 位。
- 在受保护环境 (PE) 之外启用 SCMS 和 HDMI 保护控制。
音频驱动程序中的 DRM 保护
数字权限管理 (DRM) 提供在安全容器中打包媒体数据并将使用规则附加到内容的功能。 例如，内容提供商可能使用复制保护或数字输出禁用来禁用电脑系统的直接数字副本或传输。
某些 Microsoft 产品的音频堆栈通过实现控制音频内容播放的使用规则来支持 DRM。 要播放受保护内容，基础音频驱动程序必须是受信任的驱动程序；也就是说，驱动程序必须经过 DRMLevel 1300 徽标认证。 有关开发受信任驱动程序的信息，可以使用 Windows 2000 驱动程序开发工具包（“DDK”）或更高版本中定义的接口。 使用 DDK 开发的驱动程序将实现 DRM 所需的接口。 有关详细信息，请参阅数字版权管理。
要呈现受保护内容，受信任的驱动程序必须检查是否在流经音频堆栈的内容上设置复制保护和数字输出禁用，并相应地响应设置。
复制保护规则
复制保护指示系统上不允许直接数字副本。 WHQL 测试协议的附录 B 已更新，以反映在内容上设置复制保护时驱动程序的新期望和要求。 对于 Windows 7，内置 HD 音频类驱动程序符合最新要求。
除了确保不允许将内容传递到另一个组件或存储在 DRM 系统未进行身份验证的任何非易失存储介质上外，音频驱动程序在设置复制保护时执行以下任务：
- 驱动程序在 HDMI 终结点上启用 HDCP。
- 对于 S/PDIF 接口，驱动程序验证 L、Cp 和类别代码位的组合是否指示“从不复制”的 SCMS 状态，如 IEC 60958 中的定义。
- L 位设置为 0，类别代码设置为“数字信号混音器”。
受信任的音频驱动程序使用的 DRMRIGHTS 结构指定分配给 KS 音频引脚或端口类驱动程序的流对象的 DRM 内容权限。 CopyProtect 成员指示是否在音频内容上设置复制保护。
对于 Windows 7，CopyProtect 的使用更加严格。 驱动程序可确保通过将状态设置为“从不复制”在音频接口上设置保护控件、为 HDMI 输出设置 HDCP，并为 S/PDIF 输出设置 SCMS。
数字输出禁用规则
数字输出禁用指示不允许从系统传输内容。 在 Windows 7 中，内置 HD 音频类驱动程序通过在 HDMI 终结点上启用 HDCP 来响应此设置。 这类似于驱动程序对复制保护设置的响应。
在受保护环境之外启用内容保护机制
PUMA 驻留在受保护环境 (PE) 中单独的进程中。 在 Windows Vista 中，要使用 PUMA 提供的音频内容保护控件，媒体应用程序必须位于 PE 中。 由于只有媒体基础 API 可以与 PE 交互，因此内容保护控件仅限于使用媒体基础 API 流式传输音频内容的应用程序。
在 Windows 7 中，任何应用程序都可以访问 PUMA 输出信任机构 (OTA) 提供的内容保护控件，无论它们是在 PE 中还是使用媒体基础 API 进行音频播放。
实现说明
音频应用程序需要执行以下步骤来控制音频终结点上的 SCMS 或 HDCP 内容保护。 支持的音频 API 包括 DirectShow、DirectSound 和 WASAPI。
此示例代码使用以下接口。
媒体应用程序必须执行以下任务。
设置开发环境。
引用所需的接口，包括以下代码中显示的标头。
#include <MMdeviceapi.h> // Device endpoint definitions #include <Mfidl.h> // OTA interface definitions链接到 Mfuuid.lib 以使用 OTA 接口。
禁用内核调试器和驱动程序验证程序以避免任何身份验证检查错误。
枚举系统中的所有终结点，并从终结点集合中选择目标终结点，如以下代码所示。 有关枚举设备的详细信息，请参阅枚举音频设备。
BOOL IsDigitalEndpoint(IMMDevice *pDevice) { PROPVARIANT var; IPropertyStore *pProperties = NULL; EndpointFormFactor formfactor; BOOL bResult = FALSE; HRESULT hr = S_OK; PropVariantInit(&var); // Open endpoint properties hr = pDevice->OpenPropertyStore(STGM_READ, &pProperties); IF_FAILED_JUMP(hr, Exit); // get form factor hr = pProperties->GetValue(PKEY_AudioEndpoint_FormFactor, &var); IF_FAILED_JUMP(hr, Exit); formfactor = (EndpointFormFactor)var.uiVal; // DigitalAudioDisplayDevice is defined same as HDMI formfactor if ((SPDIF == formfactor) || (DigitalAudioDisplayDevice == formfactor)) { bResult = TRUE; } Exit: PropVariantClear(&var); SAFE_RELEASE(pProperties); return bResult; }/****************************************************************** * * * GetDevice: Selects an endpoint that meets the requirements. * * * * ppDevice: Receives a pointer to an IMMDevice interface of * * the device's endpoint object * * * * * ******************************************************************/ HRESULT GetDevice(IMMDevice** ppDevice) { IMMDeviceEnumerator *pEnumerator = NULL; IMMDevice *pDevice = NULL; IMMDeviceCollection *pEndpoints = NULL; UINT cEndpoints = 0; const CLSID CLSID_MMDeviceEnumerator = __uuidof(MMDeviceEnumerator); const IID IID_IMMDeviceEnumerator = __uuidof(IMMDeviceEnumerator); // Get enumerator for audio endpoint devices hr = CoCreateInstance( CLSID_MMDeviceEnumerator, NULL, CLSCTX_ALL, IID_IMMDeviceEnumerator, (void**)&pEnumerator)); EXIT_ON_ERROR(hr) // Enumerate all active endpoints, hr = pEnumerator->EnumAudioEndpoints ( eRender, DEVICE_STATE_ACTIVE, &pEndpoints); EXIT_ON_ERROR(hr) hr = pEndpoints->GetCount(&cEndpoints); EXIT_ON_ERROR(hr) for (UINT i = 0; i < cEndpoints; i++) { hr = pEndpoints->Item(i, &pDevice); IF_FAILED_JUMP(hr, Exit); { // Select the endpoint that meets the requirements. // For example, SPDIF analog output or HDMI if (IsDigitalEndpoint(pDevice)) { *(ppDevice) = pDevice; (*ppDevice)->AddRef(); break; } } SAFE_RELEASE(pDevice); } Exit: if (FAILED(hr)) { // Notify error. // Not Shown. } SAFE_RELEASE(pEndpoints); SAFE_RELEASE(pEnumerator); }使用指向枚举过程返回的终结点的 IMMDevice 指针激活所需的音频流式处理 API 并准备流式处理。 不同的音频 API 需要的准备工作略有不同。
- 对于 DShow 音频应用程序：
通过调用 IMMDevice::Activate 并指定 IID_IBaseFilter 作为接口标识符来创建 DirectShow COM 对象。
IUnknown *pDShowFilter = NULL; ... hr = pDevice->Activate ( IID_IBaseFilter, CLSCTX_INPROC_SERVER, NULL, reinterpret_cast<void **>(&pDShowFilter));使用设备激活的此 COM 对象生成 DirectShow 筛选器图。 有关此过程的详细信息，请参阅 DirectShow SDK 文档中的“生成筛选器图”。
- 对于 DSound 音频应用程序：
通过调用 IMMDevice::Activate 并指定 IID_IDirectSound8 作为接口标识符来创建 DSound COM 对象。
IDirectSound8 *pDSSound8; ... hr = pDevice->Activate ( IID_IDirectSound8, CLSCTX_INPROC_SERVER, NULL, reinterpret_cast<void **>(&pDSSound8));使用上面创建的 DSound 对象对 DSound 进行流式处理编程。 有关此过程的详细信息，请参阅 DirectSound。
- 对于 WASAPI：
通过调用 IMMDevice::Activate 并指定 IID_IAudioClient 作为接口标识符来创建 IAudioClient COM 对象。
IAudioClient *pIAudioClient = NULL; ... hr = pDevice->Activate ( IID_IAudioClient, CLSCTX_INPROC_SERVER, NULL, reinterpret_cast<void **>(&pIAudioClient));打开音频流。
hr = pIAudioClient->Initialize(...);
- 对于 DShow 音频应用程序：
开始音频流式处理。
在流上设置保护策略。
对于 WASAPI 客户端，通过调用 IAudioClient::GetService 并指定 IID_IMFTrustedOutput 作为接口标识符来获取对流的输出信任机构 (OTA) 对象的 IMFTrustedOutput 接口的引用。
IMFTrustedOutput* pTrustedOutput = NULL; hr = pIAudioClient>GetService( __uuidof(IMFTrustedOutput), (void**)& pTrustedOutput);通过调用 IMFTrustedOutput::GetOutputTrustAuthorityCount 获取可用 OTA 对象的计数。
hr = pTrustedOutput->GetOutputTrustAuthorityCount(&m_dwCountOTA);枚举 OTA 集合并获取对支持操作 PEACTION_PLAY 的 OTA 对象的引用。 所有 OTA 都公开 IMFOutputTrustAuthority 接口。
hr = pMFTrustedOutput->GetOutputTrustAuthorityByIndex(I, &pMFOutputTrustAuthority); hr = pMFOutputTrustAuthority->GetAction(&action)使用 IMFTrustedOutput 接口在流上设置保护策略。
hr = pTrustedOutput ->SetPolicy(&pPolicy, nPolicy, &pbTicket, &cbTicket);注意
如果使用 EVR，SetPolicy 将引发 MEPolicySet 事件，并返回 MF_S_WAIT_FOR_POLICY_SET 以指示 OTA 将异步强制实施策略。 但是，在此示例代码中，应用程序是从音频客户端检索 OTA 对象的直接 WASAPI 客户端（步骤 5 a）。 与 EVR 不同，音频客户端和其他 WASAPI 对象不实现媒体事件生成器。 如果没有媒体事件生成器，IMFTrustedOutput::SetPolicy 不会返回 MF_S_WAIT_FOR_POLICY_SET。
音频策略设置必须在音频流式处理开始后设置，否则 IMFTrustedOutput::GetOutputTrustAuthorityByIndex 将失败。 此外，要支持此功能，基础音频驱动程序必须是受信任的驱动程序。
在示例代码中，pPolicy 是指向客户端实现的策略对象的 IMFOutputPolicy 接口的指针。 有关信息，请参阅 Media Foundation SDK 文档。
在 IMFOutputPolicy::GenerateRequiredSchemas 方法的实现中，必须生成 OTA 必须强制实施的输出保护系统（架构）的集合 。 每个架构由 GUID 标识，并包含保护系统的配置数据。 请确保集合中的保护系统仅限于使用受信任的音频驱动程序。 此限制由 MFPROTECTION_TRUSTEDAUDIODRIVERS、DISABLE 或 CONSTRICTAUDIO 标识。 如果使用 MFPROTECTION_TRUSTEDAUDIODRIVERS，则此架构的配置数据为 DWORD。 有关架构和相关配置数据的详细信息，请参阅受保护环境 SDK 文档。
客户端还必须通过实现 IMFOutputSchema 接口来提供架构定义。 IMFOutputSchema::GetSchemaType 将 MFPROTECTION_TRUSTEDAUDIODRIVERS 检索为架构 GUID。 IMFOutputSchema::GetConfigurationData 返回指向架构配置数据的指针。
继续音频流式处理。
在停止流式处理之前，请确保保护策略清晰明了。
释放上述相关策略接口引用。
释放调用会清除以前设置的策略设置。
注意
每次重新启动流时，都必须在流上再次设置保护策略。 该过程在步骤 5-d 中介绍。
pMFOutputTrustAuthority->Release() pMFTrustedOutput->Release()
以下代码示例演示策略和架构对象的示例实现。
//OTADsoundSample.cpp
#include <stdio.h>
#include <tchar.h>
#include <initguid.h>
#include <windows.h>
#include <mmreg.h>
#include <dsound.h>
#include <mfidl.h>
#include <Mmdeviceapi.h>
#include <AVEndpointKeys.h>
#include "OTADSoundSample.h"
#define STATIC_KSDATAFORMAT_SUBTYPE_AC3\
DEFINE_WAVEFORMATEX_GUID(WAVE_FORMAT_DOLBY_AC3_SPDIF)
DEFINE_GUIDSTRUCT("00000092-0000-0010-8000-00aa00389b71", KSDATAFORMAT_SUBTYPE_AC3);
#define KSDATAFORMAT_SUBTYPE_AC3 DEFINE_GUIDNAMED(KSDATAFORMAT_SUBTYPE_AC3)
HRESULT SetOTAPolicy(IMMDevice *_pMMDevice,
DWORD _dwConfigData,
IMFTrustedOutput **_ppMFTrustedOutput,
IMFOutputTrustAuthority **ppMFOutputTrustAuthority,
IMFOutputPolicy **_ppMFOutputPolicy);
HRESULT ClearOTAPolicy(IMFTrustedOutput *_pMFTrustedOutput,
IMFOutputTrustAuthority *_pMFOutputTrustAuthority,
IMFOutputPolicy *_pMFOutputPolicy);
const CLSID CLSID_MMDeviceEnumerator = __uuidof(MMDeviceEnumerator);
const IID IID_IMMDeviceEnumerator = __uuidof(IMMDeviceEnumerator);
BOOL IsDigitalEndpoint(IMMDevice *pDevice)
{
PROPVARIANT var;
IPropertyStore *pProperties = NULL;
EndpointFormFactor formfactor;
BOOL bResult = FALSE;
HRESULT hr = S_OK;
PropVariantInit(&var);
// Open endpoint properties
hr = pDevice->OpenPropertyStore(STGM_READ, &pProperties);
IF_FAILED_JUMP(hr, Exit);
// get form factor
hr = pProperties->GetValue(PKEY_AudioEndpoint_FormFactor, &var);
IF_FAILED_JUMP(hr, Exit);
formfactor = (EndpointFormFactor)var.uiVal;
if ((SPDIF == formfactor) || (DigitalAudioDisplayDevice == formfactor))
{
bResult = TRUE;
}
Exit:
PropVariantClear(&var);
SAFE_RELEASE(pProperties);
return bResult;
}
HRESULT GetDigitalAudioEndpoint(IMMDevice** ppDevice)
{
IMMDeviceEnumerator *pEnumerator = NULL;
IMMDevice *pDevice = NULL;
IMMDeviceCollection *pEndpoints = NULL;
UINT cEndpoints = 0;
HRESULT hr = S_OK;
*ppDevice = NULL;
// Get enumerator for audio endpoint devices.
hr = CoCreateInstance(CLSID_MMDeviceEnumerator, NULL,
CLSCTX_ALL, IID_IMMDeviceEnumerator,
(void**)&pEnumerator);
IF_FAILED_JUMP(hr, Exit);
// Enumerate all active render endpoints,
hr = pEnumerator->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, &pEndpoints);
IF_FAILED_JUMP(hr, Exit);
hr = pEndpoints->GetCount(&cEndpoints);
IF_FAILED_JUMP(hr, Exit);
for (UINT i = 0; i < cEndpoints; i++)
{
hr = pEndpoints->Item(i, &pDevice);
IF_FAILED_JUMP(hr, Exit);
// Select the endpoint that meets the requirements.
// For example, SPDIF analog output or HDMI
// Not Shown.
if (IsDigitalEndpoint(pDevice))
{
*ppDevice = pDevice;
(*ppDevice)->AddRef();
break;
}
SAFE_RELEASE(pDevice);
}
Exit:
if (FAILED(hr))
{
// Notify error.
// Not Shown.
}
SAFE_RELEASE(pEndpoints);
SAFE_RELEASE(pEnumerator);
return hr;
}
//-------------------------------------------------------------------
int __cdecl wmain(int argc, char* argv[])
{
IMMDevice *pEndpoint=NULL;
HRESULT hr = S_OK;
// DSound related variables
IDirectSound8* DSSound8 = NULL;
IDirectSoundBuffer* DSBuffer = NULL;
DSBUFFERDESC DSBufferDesc;
WAVEFORMATEXTENSIBLE wfext;
WORD nChannels = 2;
DWORD nSamplesPerSec = 48000;
WORD wBitsPerSample = 16;
// OTA related variables
IMFTrustedOutput *pMFTrustedOutput=NULL;
IMFOutputPolicy *pMFOutputPolicy=NULL;
IMFOutputTrustAuthority *pMFOutputTrustAuthority=NULL;
DWORD dwConfigData=0;
// Initialize COM
hr = CoInitialize(NULL);
IF_FAILED_JUMP(hr, Exit);
printf("OTA test app for DSound\n");
hr = GetDigitalAudioEndpoint(&pEndpoint);
IF_FAILED_JUMP(hr, Exit);
if (pEndpoint)
{
printf("Found digital audio endpoint.\n");
}
//
// Active DSound interface
//
hr = pEndpoint->Activate(IID_IDirectSound8, CLSCTX_INPROC_SERVER, NULL, reinterpret_cast<void **>(&DSSound8));
IF_FAILED_JUMP(hr, Exit);
nChannels = 2;
nSamplesPerSec = 48000;
wBitsPerSample = 16;
ZeroMemory(&wfext, sizeof(wfext));
wfext.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
wfext.Format.nChannels = nChannels;
wfext.Format.nSamplesPerSec = nSamplesPerSec;
wfext.Format.wBitsPerSample = wBitsPerSample;
wfext.Format.nBlockAlign = (nChannels * wBitsPerSample) / 8;
wfext.Format.nAvgBytesPerSec = nSamplesPerSec * ((nChannels * wBitsPerSample) / 8);
wfext.Format.cbSize = 22;
wfext.Samples.wValidBitsPerSample = wBitsPerSample;
wfext.dwChannelMask = 0x3;
wfext.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
#if 1
wfext.SubFormat = KSDATAFORMAT_SUBTYPE_AC3;
#endif
ZeroMemory(&DSBufferDesc, sizeof(DSBufferDesc));
DSBufferDesc.dwSize = sizeof(DSBufferDesc);
DSBufferDesc.dwFlags = DSBCAPS_GLOBALFOCUS | DSBCAPS_LOCSOFTWARE | DSBCAPS_GETCURRENTPOSITION2;
DSBufferDesc.lpwfxFormat = (WAVEFORMATEX *)&wfext;
DSBufferDesc.dwBufferBytes = wfext.Format.nAvgBytesPerSec / 100;
HWND hwnd = GetForegroundWindow();
hr = DSSound8->SetCooperativeLevel(hwnd, DSSCL_PRIORITY);
IF_FAILED_JUMP(hr, Exit);
hr = DSSound8->CreateSoundBuffer(&DSBufferDesc, &DSBuffer, NULL);
IF_FAILED_JUMP(hr, Exit);
hr = DSBuffer->Play(0, 0, DSBPLAY_LOOPING);
IF_FAILED_JUMP(hr, Exit);
printf("Will set the following audio policy:\n");
printf("Test Certificate Enable: %s\n", TRUE ? "True" : "False");
printf("Copy OK: %s\n", FALSE ? "True" : "False");
printf("Digital Output Disable: %s\n", FALSE ? "True" : "False");
printf("DRM Level: %u\n", 1300);
// Set policy when the stream is in RUN state
dwConfigData = MAKE_MFPROTECTIONDATA_TRUSTEDAUDIODRIVERS2(TRUE, /*_bTestCertificateEnable*/
FALSE, /*_bDigitalOutputDisable*/
FALSE, /*_bCopyOK*/
1300 /*_dwDrmLevel*/);
hr = SetOTAPolicy(pEndpoint,dwConfigData, &pMFTrustedOutput, &pMFOutputTrustAuthority,&pMFOutputPolicy);
IF_FAILED_JUMP(hr, Exit);
//
// Perform all the necessary streaming operations here.
//
// stop audio streaming
DSBuffer->Stop();
// In order for the stream to restart successfully
// Need to release the following OutputTrust* interface to release audio endpoint
hr = ClearOTAPolicy(pMFTrustedOutput,pMFOutputTrustAuthority,pMFOutputPolicy);
IF_FAILED_JUMP(hr, Exit);
// After above release operations, the following Play() will succeed without device-in-use error message 0x8889000A
DSBuffer->SetCurrentPosition(0);
hr = DSBuffer->Play(0, 0, DSBPLAY_LOOPING);
IF_FAILED_JUMP(hr, Exit);
// Need to reset the new audio protection state because previous settings were gone with the ClearOTAPolicy call.
dwConfigData = MAKE_MFPROTECTIONDATA_TRUSTEDAUDIODRIVERS2(TRUE, /*_bTestCertificateEnable*/
FALSE, /*_bDigitalOutputDisable*/
FALSE, /*_bCopyOK*/
1300 /*_dwDrmLevel*/);
hr = SetOTAPolicy(pEndpoint,dwConfigData, &pMFTrustedOutput, &pMFOutputTrustAuthority,&pMFOutputPolicy);
IF_FAILED_JUMP(hr, Exit);
// Clean up setting before leaving your streaming app.
hr = ClearOTAPolicy(pMFTrustedOutput,pMFOutputTrustAuthority,pMFOutputPolicy);
IF_FAILED_JUMP(hr, Exit);
DSBuffer->SetCurrentPosition(0);
Exit:
SAFE_RELEASE(DSBuffer);
SAFE_RELEASE(DSSound8);
SAFE_RELEASE(pEndpoint);
CoUninitialize();
return 0;
}
//OTADSoundSample.h
// Macro defines
#define IF_FAILED_JUMP(_hresult, label) \
if(FAILED(_hresult)) \
{ \
goto label; \
}
#define SAFE_RELEASE(p) \
if (NULL != p) { \
(p)->Release(); \
(p) = NULL; \
}
#define IF_TRUE_ACTION_JUMP(condition, action, label) \
if(condition) \
{ \
action; \
goto label; \
}
// outputpolicy.h
class CTrustedAudioDriversOutputPolicy : public CMFAttributesImpl<IMFOutputPolicy>
{
friend
HRESULT CreateTrustedAudioDriversOutputPolicy(DWORD dwConfigData, IMFOutputPolicy **ppMFOutputPolicy);
private:
ULONG m_cRefCount;
DWORD m_dwConfigData;
GUID m_guidOriginator;
IMFOutputSchema *m_pOutputSchema;
CTrustedAudioDriversOutputPolicy(DWORD dwConfigData, HRESULT &hr);
~CTrustedAudioDriversOutputPolicy();
public:
// IUnknown methods
HRESULT STDMETHODCALLTYPE QueryInterface(/* [in] */ REFIID riid,/* [out] */ LPVOID *ppvObject);
ULONG STDMETHODCALLTYPE AddRef();
ULONG STDMETHODCALLTYPE Release();
// IMFOutputPolicy methods
HRESULT STDMETHODCALLTYPE
GenerateRequiredSchemas(
/* [in] */ DWORD dwAttributes,
/* [in] */ GUID guidOutputSubType,
/* [in] */ GUID *rgGuidProtectionSchemasSupported,
/* [in] */ DWORD cProtectionSchemasSupported,
/* [annotation][out] */
__out IMFCollection **ppRequiredProtectionSchemas);
HRESULT STDMETHODCALLTYPE GetOriginatorID(/* [annotation][out] */ __out GUID *pguidOriginatorID);
HRESULT STDMETHODCALLTYPE GetMinimumGRLVersion(/* [annotation][out] */ __out DWORD *pdwMinimumGRLVersion);
}; // CTrustedAudioDriversOutputPolicy
class CTrustedAudioDriversOutputSchema : public CMFAttributesImpl<IMFOutputSchema>
{
friend
HRESULT CreateTrustedAudioDriversOutputSchema(
DWORD dwConfigData,
GUID guidOriginatorID,
IMFOutputSchema **ppMFOutputSchema
);
private:
CTrustedAudioDriversOutputSchema(DWORD dwConfigData, GUID guidOriginatorID);
~CTrustedAudioDriversOutputSchema();
ULONG m_cRefCount;
DWORD m_dwConfigData;
GUID m_guidOriginatorID;
public:
// IUnknown methods
HRESULT STDMETHODCALLTYPE QueryInterface(
/* [in] */ REFIID riid,
/* [out] */ LPVOID *ppvObject
);
ULONG STDMETHODCALLTYPE AddRef();
ULONG STDMETHODCALLTYPE Release();
// IMFOutputSchema methods
HRESULT STDMETHODCALLTYPE GetConfigurationData(__out DWORD *pdwVal);
HRESULT STDMETHODCALLTYPE GetOriginatorID(__out GUID *pguidOriginatorID);
HRESULT STDMETHODCALLTYPE GetSchemaType(__out GUID *pguidSchemaType);
}; // CTrustedAudioDriversOutputSchema
// outputpolicy.cpp
#include <windows.h>
#include <tchar.h>
#include <mfidl.h>
#include <atlstr.h>
#include <attributesbase.h>
#include "OTADSoundSample.h"
#include <Mmdeviceapi.h>
#include "OutputPolicy.h"
#define RETURN_INTERFACE(T, iid, ppOut) \
if (IsEqualIID(__uuidof(T), (iid))) { \
this->AddRef(); \
*(ppOut) = static_cast<T *>(this); \
return S_OK; \
} else {} (void)0
//--------------------------------------------------------------------------
// Implementation for CTrustedAudioDriversOutputPolicy
//--------------------------------------------------------------------------
// constructor
CTrustedAudioDriversOutputPolicy::CTrustedAudioDriversOutputPolicy(DWORD dwConfigData, HRESULT &hr)
: m_cRefCount(1), m_dwConfigData(dwConfigData), m_pOutputSchema(NULL)
{
hr = CoCreateGuid(&m_guidOriginator);
IF_FAILED_JUMP(hr, Exit);
hr = CreateTrustedAudioDriversOutputSchema(dwConfigData, m_guidOriginator, &m_pOutputSchema);
IF_FAILED_JUMP(hr, Exit);
Exit:
if (FAILED(hr))
{
printf("CreateTrustedAudioDriversOutputSchema failed: hr = 0x%08x", hr);
}
return;
}
// destructor
CTrustedAudioDriversOutputPolicy::~CTrustedAudioDriversOutputPolicy()
{
if (NULL != m_pOutputSchema)
{
m_pOutputSchema->Release();
}
}
// IUnknown::QueryInterface
HRESULT STDMETHODCALLTYPE
CTrustedAudioDriversOutputPolicy::QueryInterface(
/* [in] */ REFIID riid,
/* [out] */ LPVOID *ppvObject)
{
HRESULT hr = E_NOINTERFACE;
IF_TRUE_ACTION_JUMP((NULL == ppvObject), hr = E_POINTER, Exit);
*ppvObject = NULL;
RETURN_INTERFACE(IUnknown, riid, ppvObject);
RETURN_INTERFACE(IMFAttributes, riid, ppvObject);
RETURN_INTERFACE(IMFOutputPolicy, riid, ppvObject);
Exit:
return hr;
}
// IUnknown::AddRef
ULONG STDMETHODCALLTYPE CTrustedAudioDriversOutputPolicy::AddRef()
{
ULONG uNewRefCount = InterlockedIncrement(&m_cRefCount);
return uNewRefCount;
}
// IUnknown::Release
ULONG STDMETHODCALLTYPE CTrustedAudioDriversOutputPolicy::Release()
{
ULONG uNewRefCount = InterlockedDecrement(&m_cRefCount);
if (0 == uNewRefCount)
{
delete this;
}
return uNewRefCount;
}
// IMFOutputPolicy::GenerateRequiredSchemas
HRESULT STDMETHODCALLTYPE CTrustedAudioDriversOutputPolicy::GenerateRequiredSchemas
(
/* [in] */ DWORD dwAttributes,
/* [in] */ GUID guidOutputSubType,
/* [in] */ GUID *rgGuidProtectionSchemasSupported,
/* [in] */ DWORD cProtectionSchemasSupported,
/* [annotation][out] */
__out IMFCollection **ppRequiredProtectionSchemas
)
{
HRESULT hr = S_OK;
bool bTrustedAudioDriversSupported = false;
// if we've made it this far then the Output Trust Authority supports Trusted Audio Drivers
// create a collection and put our output policy in it
// then give that collection to the caller
CComPtr<IMFCollection> pMFCollection;
// sanity checks
IF_TRUE_ACTION_JUMP((NULL == ppRequiredProtectionSchemas), hr = E_POINTER, Exit);
*ppRequiredProtectionSchemas = NULL;
IF_TRUE_ACTION_JUMP((NULL == rgGuidProtectionSchemasSupported) && (0 != cProtectionSchemasSupported),
hr = E_POINTER, Exit);
// log all the supported protection schemas
for (DWORD i = 0; i < cProtectionSchemasSupported; i++)
{
if (IsEqualIID(MFPROTECTION_TRUSTEDAUDIODRIVERS, rgGuidProtectionSchemasSupported[i]))
{
bTrustedAudioDriversSupported = true;
}
}
if (!bTrustedAudioDriversSupported)
{
return HRESULT_FROM_WIN32(ERROR_RANGE_NOT_FOUND);
}
// create the collection
hr = MFCreateCollection(&pMFCollection);
if (FAILED(hr))
{
return hr;
}
// add our output policy to the collection
hr = pMFCollection->AddElement(m_pOutputSchema);
if (FAILED(hr))
{
return hr;
}
Exit:
// give the collection to the caller
return pMFCollection.CopyTo(ppRequiredProtectionSchemas); // increments refcount
}// GenerateRequiredSchemas
HRESULT STDMETHODCALLTYPE CTrustedAudioDriversOutputPolicy::GetOriginatorID(__out GUID *pguidOriginatorID)
{
if (NULL == pguidOriginatorID)
{
return E_POINTER;
}
*pguidOriginatorID = m_guidOriginator;
return S_OK;
}
HRESULT STDMETHODCALLTYPE CTrustedAudioDriversOutputPolicy::GetMinimumGRLVersion(__out DWORD *pdwMinimumGRLVersion)
{
if (NULL == pdwMinimumGRLVersion)
{
return E_POINTER;
}
*pdwMinimumGRLVersion = 0;
return S_OK;
}
//--------------------------------------------------------------------------
// Implementation for CTrustedAudioDriversOutputSchema
//--------------------------------------------------------------------------
// constructor
CTrustedAudioDriversOutputSchema::CTrustedAudioDriversOutputSchema
(
DWORD dwConfigData,
GUID guidOriginatorID
)
: m_cRefCount(1)
, m_dwConfigData(dwConfigData)
, m_guidOriginatorID(guidOriginatorID)
{}
// destructor
CTrustedAudioDriversOutputSchema::~CTrustedAudioDriversOutputSchema() {}
// IUnknown::QueryInterface
HRESULT STDMETHODCALLTYPE CTrustedAudioDriversOutputSchema::QueryInterface
(
/* [in] */ REFIID riid,
/* [out] */ LPVOID *ppvObject
)
{
HRESULT hr = E_NOINTERFACE;
IF_TRUE_ACTION_JUMP((NULL == ppvObject), hr = E_POINTER, Exit);
*ppvObject = NULL;
RETURN_INTERFACE(IUnknown, riid, ppvObject);
RETURN_INTERFACE(IMFAttributes, riid, ppvObject);
RETURN_INTERFACE(IMFOutputSchema, riid, ppvObject);
Exit:
return hr;
}
// IUnknown::AddRef
ULONG STDMETHODCALLTYPE CTrustedAudioDriversOutputSchema::AddRef()
{
ULONG uNewRefCount = InterlockedIncrement(&m_cRefCount);
return uNewRefCount;
}
// IUnknown::Release
ULONG STDMETHODCALLTYPE CTrustedAudioDriversOutputSchema::Release()
{
ULONG uNewRefCount = InterlockedDecrement(&m_cRefCount);
if (0 == uNewRefCount)
{
delete this;
}
return uNewRefCount;
}
// IMFOutputSchema::GetConfigurationData
HRESULT STDMETHODCALLTYPE CTrustedAudioDriversOutputSchema::GetConfigurationData(__out DWORD *pdwVal)
{
if (NULL == pdwVal) { return E_POINTER; }
*pdwVal = m_dwConfigData;
return S_OK;
}
// IMFOutputSchema::GetOriginatorID
HRESULT STDMETHODCALLTYPE CTrustedAudioDriversOutputSchema::GetOriginatorID(__out GUID *pguidOriginatorID)
{
if (NULL == pguidOriginatorID) { return E_POINTER; }
*pguidOriginatorID = m_guidOriginatorID;
return S_OK;
}
// IMFOutputSchema::GetSchemaType
HRESULT STDMETHODCALLTYPE CTrustedAudioDriversOutputSchema::GetSchemaType(__out GUID *pguidSchemaType)
{
if (NULL == pguidSchemaType) { return E_POINTER; }
*pguidSchemaType = MFPROTECTION_TRUSTEDAUDIODRIVERS;
return S_OK;
}
//---------------------------------------------------------------------------------------------------
//
// Other subroutine declarations
//
//---------------------------------------------------------------------------------------------------
HRESULT CreateTrustedAudioDriversOutputPolicy(DWORD dwConfigData, IMFOutputPolicy **ppMFOutputPolicy)
{
if (NULL == ppMFOutputPolicy)
{
return E_POINTER;
}
*ppMFOutputPolicy = NULL;
HRESULT hr = S_OK;
CTrustedAudioDriversOutputPolicy *pPolicy = new CTrustedAudioDriversOutputPolicy(dwConfigData, hr);
if (NULL == pPolicy)
{
return E_OUTOFMEMORY;
}
if (FAILED(hr))
{
delete pPolicy;
return hr;
}
*ppMFOutputPolicy = static_cast<IMFOutputPolicy *>(pPolicy);
return S_OK;
}// CreateTrustedAudioDriversOutputPolicy
HRESULT CreateTrustedAudioDriversOutputSchema
(
DWORD dwConfigData,
GUID guidOriginatorID,
IMFOutputSchema **ppMFOutputSchema)
{
if (NULL == ppMFOutputSchema)
{
return E_POINTER;
}
*ppMFOutputSchema = NULL;
CTrustedAudioDriversOutputSchema *pSchema =
new CTrustedAudioDriversOutputSchema(dwConfigData, guidOriginatorID);
if (NULL == pSchema)
{
return E_OUTOFMEMORY;
}
*ppMFOutputSchema = static_cast<IMFOutputSchema *>(pSchema);
return S_OK;
}// CreateTrustedAudioDriversOutputSchema
HRESULT SetOTAPolicy(IMMDevice *_pMMDevice,
DWORD _dwConfigData,
IMFTrustedOutput **_ppMFTrustedOutput,
IMFOutputTrustAuthority **ppMFOutputTrustAuthority,
IMFOutputPolicy **_ppMFOutputPolicy)
{
HRESULT hr = S_OK;
DWORD dwCountOfOTAs = 0;
bool bRet = false;
hr = CreateTrustedAudioDriversOutputPolicy(_dwConfigData, _ppMFOutputPolicy);
IF_FAILED_JUMP(hr, Exit);
// activate IMFTrustedOutput
hr = _pMMDevice->Activate(__uuidof(IMFTrustedOutput), CLSCTX_ALL, NULL,
(void**)_ppMFTrustedOutput);
IF_FAILED_JUMP(hr, Exit);
// get count of Output Trust Authorities on this trusted output
hr = (*_ppMFTrustedOutput)->GetOutputTrustAuthorityCount(&dwCountOfOTAs);
IF_FAILED_JUMP(hr, Exit);
// sanity check - fail on endpoints with no output trust authorities
IF_TRUE_ACTION_JUMP((0 == dwCountOfOTAs), hr = E_NOTFOUND, Exit);
printf("dwCountOfOTAs = %d\n", dwCountOfOTAs);
// loop over each output trust authority on the endpoint
for (DWORD i = 0; i < dwCountOfOTAs; i++)
{
// get the output trust authority
hr = (*_ppMFTrustedOutput)->GetOutputTrustAuthorityByIndex(i, ppMFOutputTrustAuthority);
IF_FAILED_JUMP(hr, Exit);
// log the purpose of the output trust authority
MFPOLICYMANAGER_ACTION action;
hr = (*ppMFOutputTrustAuthority)->GetAction(&action);
if (FAILED(hr))
{
return hr;
}
printf(" It's %s.", (PEACTION_PLAY==action) ? "PEACTION_PLAY" :
(PEACTION_COPY==action) ? "PEACTION_COPY" :
"Others");
// only PEACTION_PLAY Output Trust Authorities are relevant
if (PEACTION_PLAY != action)
{
printf("Skipping as the OTA action is not PEACTION_PLAY");
SAFE_RELEASE(*ppMFOutputTrustAuthority);
continue;
}
BYTE *pbTicket = NULL;
DWORD cbTicket = 0;
// audio ota does not support ticket, leaving it NULL is ok.
hr = (*ppMFOutputTrustAuthority)->SetPolicy(_ppMFOutputPolicy, 1, &pbTicket, &cbTicket);
IF_FAILED_JUMP(hr, Exit);
printf("SetPolicy succeeded.\n");
bRet = true;
break;
}// for each output trust authority
Exit:
if (bRet)
{
hr = S_OK;
}
if (FAILED(hr))
{
printf("failure code is 0x%0x\n", hr);
SAFE_RELEASE(*ppMFOutputTrustAuthority);
SAFE_RELEASE(*_ppMFTrustedOutput);
if (*_ppMFOutputPolicy)
{
delete (*_ppMFOutputPolicy);
}
}
return hr;
}
HRESULT ClearOTAPolicy(IMFTrustedOutput *_pMFTrustedOutput,
IMFOutputTrustAuthority *_pMFOutputTrustAuthority,
IMFOutputPolicy *_pMFOutputPolicy)
{
SAFE_RELEASE(_pMFOutputTrustAuthority);
SAFE_RELEASE(_pMFTrustedOutput);
if (_pMFOutputPolicy)
{
delete _pMFOutputPolicy;
}
return S_OK;
}
//OTADSoundSample.rc
#include "windows.h"
/////////////////////////////////////////////////////////////////////////////
// Version
#include <ntverp.h>
#define VER_FILETYPE VFT_DLL
#define VER_FILESUBTYPE VFT2_UNKNOWN
#define VER_FILEDESCRIPTION_STR "Default Device Heuristic Dumper"
#define VER_INTERNALNAME_STR "DefaultDeviceDump.exe"
#define VER_ORIGINALFILENAME_STR "DefaultDeviceDump.exe"
#include "common.ver"
Sources file:
TARGETNAME=OTADSoundSample
TARGETTYPE=PROGRAM
TARGET_DESTINATION=retail
UMTYPE=console
UMENTRY=wmain
UMBASE=0x1000000
#_NT_TARGET_VERSION=$(_NT_TARGET_VERSION_VISTA)
MSC_WARNING_LEVEL=$(MSC_WARNING_LEVEL) /WX
USE_ATL=1
ATL_VER=70
USE_NATIVE_EH=1
USE_MSVCRT=1
C_DEFINES=-DUNICODE -D_UNICODE
INCLUDES=$(INCLUDES);
SOURCES=OTADSoundSample.cpp \
OTADSoundSample.rc \
outputpolicy.cpp\
TARGETLIBS=\
$(SDK_LIB_PATH)\advapi32.lib \
$(SDK_LIB_PATH)\kernel32.lib \
$(SDK_LIB_PATH)\User32.lib \
$(SDK_LIB_PATH)\shlwapi.lib \
$(SDK_LIB_PATH)\ole32.lib \
$(SDK_LIB_PATH)\oleaut32.lib \
$(SDK_LIB_PATH)\rpcrt4.lib \
$(SDK_LIB_PATH)\strmiids.lib \
$(SDK_LIB_PATH)\uuid.lib \
$(SDK_LIB_PATH)\SetupAPI.lib \
$(SDK_LIB_PATH)\mfplat.lib \