SAR Implementation and Windows Server 2022 #122

Activity

1. amurzeau

   changed the title [-]SAR Implementation and Windows 10 21H1[/-] [+]SAR Implementation and Windows Server 2022[/+] on Aug 16, 2021
2. amurzeau commented on Aug 16, 2021

   

   amurzeau

   on Aug 16, 2021

   CollaboratorAuthor

   More actions

   The header contains this:

   // Identifier for virtual audio device that supports audio loopback based on
   // a process ID instead of the device interface path of a physical audio device.
   // Use this for the deviceInterfacePath parameter of ActivateAudioInterfaceAsync when
   // AUDIOCLIENT_ACTIVATION_PARAMS::ActivationType is set to AUDIOCLIENT_ACTIVATION_TYPE_PROCESS_LOOPBACK.
   #define VIRTUAL_AUDIO_DEVICE_PROCESS_LOOPBACK L"VAD\\Process_Loopback"
   typedef /* [v1_enum] */ 
   enum PROCESS_LOOPBACK_MODE
       {
           PROCESS_LOOPBACK_MODE_INCLUDE_TARGET_PROCESS_TREE	= 0,
           PROCESS_LOOPBACK_MODE_EXCLUDE_TARGET_PROCESS_TREE	= 1
       } 	PROCESS_LOOPBACK_MODE;
   
   // This structure is used when creating an IAudioClient using ActivateAudioInterfaceAsync
   // for process-based loopback capture. The captured audio either includes or excludes audio rendered
   // by the specified process and its child processes, based on how the ProcessLoopbackMode field is set.
   typedef struct AUDIOCLIENT_PROCESS_LOOPBACK_PARAMS
       {
       DWORD TargetProcessId;
       PROCESS_LOOPBACK_MODE ProcessLoopbackMode;
       } 	AUDIOCLIENT_PROCESS_LOOPBACK_PARAMS;
   
   typedef /* [v1_enum] */ 
   enum AUDIOCLIENT_ACTIVATION_TYPE
       {
           AUDIOCLIENT_ACTIVATION_TYPE_DEFAULT	= 0,
           AUDIOCLIENT_ACTIVATION_TYPE_PROCESS_LOOPBACK	= 1
       } 	AUDIOCLIENT_ACTIVATION_TYPE;
   
   // Activation parameter structure that can be used with ActivateAudioInterfaceAsync
   // to create an IAudioClient.
   typedef struct AUDIOCLIENT_ACTIVATION_PARAMS
       {
       AUDIOCLIENT_ACTIVATION_TYPE ActivationType;
       union 
           {
           AUDIOCLIENT_PROCESS_LOOPBACK_PARAMS ProcessLoopbackParams;
           } 	DUMMYUNIONNAME;
       } 	AUDIOCLIENT_ACTIVATION_PARAMS;

   It seems to me that the goal is to allow an UWP app to capture audio output by some processes only (using the process ID) via the ActivateAudioInterfaceAsync function and a fake capture device.

   So this does not seems to render SAR useless, as it is still not possible to output audio to a virtual user defined audio device.