Tuning Model Interfaces
These interfaces are used primarily by guide store loaders, to create tune requests for an EPG database (guide store), and by applications that install custom tuning spaces on a system. Applications can also use these interfaces to:
- Create or modify a tune request dynamically.
- Test the validity of a tuning space.
- Create a default preferred components list that indicates user preferences for options such as the audio stream language.
- Examine the components (such as audio substreams) available on a specified service.
For more information, see The Microsoft Unified Tuning Model.
Tuning Space Interfaces
These interfaces manage tuning space objects. You will never use the base class ITuningSpace interface directly; you will always use a derived interface that is specific to a particular network type.
| Interface | Description |
|---|---|
| IAnalogRadioTuningSpace | Represents a tuning space for analog radio networks. (Not implemented in this release.) |
| IAnalogRadioTuningSpace2 | Represents a tuning space for analog radio networks and exposes a dialing prefix property. |
| IAnalogTVTuningSpace | Represents a tuning space for analog TV networks. |
| IATSCTuningSpace | Represents a tuning space for ATSC networks. |
| IAuxInTuningSpace | Represents a tuning space for S-video or composite video inputs. |
| IAuxInTuningSpace2 | Represents a tuning space for S-video or composite video inputs and exposes a dialing prefix property. |
| ICreatePropBagOnRegKey | Creates a property bag for saving a default tune request to the system registry. |
| IDigitalCableTuningSpace | Provides methods for working with tuning spaces with an ATSC network type. |
| IDVBSTuningSpace | Represents a tuning space for satellite DVB (DVB-S) networks. |
| IDVBTuningSpace | Represents a tuning space for DVB networks. |
| IDVBTuningSpace2 | Represents a tuning space for DVB networks; extends the IDVBTuningSpace interface. |
| IEnumTuningSpaces | Standard COM enumeration interface for tuning spaces. |
| IMPEG2TuneRequestFactory | Creates a minimal MPEG-2 tune request for a specified tuning space. |
| ITuningSpace | Base interface for all tuning spaces. |
| ITuningSpaceContainer | Provides access to all of the tuning spaces installed on the host system. |
| ITuningSpaces | Represents a collection of tuning spaces. |
Tune Request Interfaces
Tune requests are not created directly. They are obtained through a call to CreateTuneRequest on a network-specific tuning space interface, such as IDVBTuningSpace.
| Interface | Description |
|---|---|
| IATSCChannelTuneRequest | Provides tuning information specific to ATSC TV networks. |
| IChannelTuneRequest | Provides tuning information specific to analog TV networks. |
| IDigitalCableTuneRequest | Provides methods for getting and setting the minor channel for a digital cable transmission. |
| IDVBTuneRequest | Provides tuning information specific to DVB TV networks. |
| IEnumTuningSpaces | Implemented on a standard COM collection of tuning space objects. |
| IMPEG2TuneRequest | Represents a minimal MPEG-2 tune request. |
| IMPEG2TuneRequestFactory | Creates a tune request for a basic MPEG-2 transport stream containing the minimal tables. |
| ITuneRequest | Provides tuning information relevant for all network types. |
Stream Component Interfaces
A "component" in this context refers to a substream within a broadcast. Applications create a default preferred components collection based on user input, in order to specify, for example, a preferred audio stream language. When an audio stream is specified in this way, the Network Provider will always attempt to use it for all tune request in the tuning space (See ITuningSpace::put_DefaultPreferredComponentTypes.) In some cases the actual components of a broadcast stream can only be discovered after reception begins, or the actual components may differ from what was advertised in the EPG information. At that time the BDA Network Provider will fill in the Component information in the tune request, and the application can then retrieve it and use it, for example, to change the audio stream or determine which audio streams are currently available.
| Interface | Description |
|---|---|
| IAnalogAudioComponentType | Provides methods for accessing the analog audio mode. |
| IATSCComponentType | Provides a method that indicates whether the audio substream is in AC-3 format. |
| IComponent | Base class for all derived component interfaces. |
| IComponents | Provides a standard COM enumeration of components. |
| IComponentType | Base class for all derived component type interfaces. |
| IComponentTypes | Provides a standard COM enumeration of component types. |
| IEnumComponents | Implemented on a standard COM collection object containing all the active or inactive components on the current broadcast stream. |
| IEnumComponentTypes | Implemented on a standard COM collection of ComponentType objects associated with a given broadcast stream. |
| ILanguageComponentType | Provides methods that describe the language of the substream. |
| IMPEG2Component | Contains methods for getting and setting properties that describe an MPEG2 elementary stream. |
| IMPEG2ComponentType | Provides methods that describe a component type associated with an MPEG-2 stream type. |
Locator Interfaces
Locators are used by the Network Provider and other filters in the graph to determine how to locate a specified program. These interfaces are not used by applications except possibly for debugging purposes. Third parties that install new tuning spaces should also provide a default locator for the tuning space. An individual tune request contains a locator, which can be different from the default locator. If present, the locator in the tune request takes precedence over the default locator
| Interface | Description |
|---|---|
| IAnalogLocator | Provides tuning information for an analog television network. |
| IATSCLocator | Provides tuning information for an ATSC network. |
| IATSCLocator2 | Enables the network provider to determine the physical channel, transport stream ID, and program number of an ATSC transmission. |
| IDigitalCableLocator | Provides tuning information for a digital cable network. |
| IDigitalLocator | Base interface for all derived locator interfaces for digital networks. Not used directly. |
| IDVBCLocator | Provides tuning information for a DVB-C network. |
| IDVBSLocator | Provides tuning information for a DVB-S network. |
| IDVBTLocator | Provides tuning information for a DVB-T network. |
| ILocator | Base interface for all derived locator interfaces. Not used directly. |
Miscellaneous Tuning Model Interfaces
| Interface | Description |
|---|---|
| ICreatePropBagOnRegKey | Creates a property bag that can store information in the system registry. |
Send comments about this topic to Microsoft
Build date: 12/4/2008