Difference between revisions of "Developer:Davaar:InfoService"
(→API Reference) |
(→Architecture Overview) |
||
| Line 1: | Line 1: | ||
= Architecture Overview = | = Architecture Overview = | ||
| − | The Info Service provides source-independent information concerning the currently playing media | + | The Info Service provides source-independent information concerning the currently playing media. |
| − | This information is | + | This information provided is based on the concept of a Track, which has a Uri and Metadata in DIDL-Lite form. |
| − | The Track may also have Details, which describe the bit-rate, sample-rate, bit-depth, etc | + | The Track may also have Details, which describe the bit-rate, sample-rate, bit-depth, etc. |
| − | Furthermore, the Track might have Metatext, such as karaoke lyrics or | + | These Details may not be known at the point of a track changing. Typically are cleared at the point of track change and become available shortly afterwards. |
| + | |||
| + | Furthermore, the Track might have Metatext, such as karaoke lyrics or broadcast information in the case of an internet radio station. Again, this Metatext is typically cleared at the point of track change and changes any number of times as the track is being played. | ||
==Counters== | ==Counters== | ||
| Line 17: | Line 19: | ||
The Counters action can be used by clients that are unable to partake in UPnP eventing in order to establish changes in the information provided by the Info Service. | The Counters action can be used by clients that are unable to partake in UPnP eventing in order to establish changes in the information provided by the Info Service. | ||
| − | |||
| − | |||
==Track== | ==Track== | ||
Revision as of 15:33, 18 November 2010
Contents
Architecture Overview
The Info Service provides source-independent information concerning the currently playing media.
This information provided is based on the concept of a Track, which has a Uri and Metadata in DIDL-Lite form.
The Track may also have Details, which describe the bit-rate, sample-rate, bit-depth, etc.
These Details may not be known at the point of a track changing. Typically are cleared at the point of track change and become available shortly afterwards.
Furthermore, the Track might have Metatext, such as karaoke lyrics or broadcast information in the case of an internet radio station. Again, this Metatext is typically cleared at the point of track change and changes any number of times as the track is being played.
Counters
Counters are used to manage the changing of the Track, Details, and Metatext information.
When a track changes, the Track Count is incremented, the Uri and Metadata are set, the Details Count is set to zero, the Details are defaulted to blank and zero values, the Metatext Count is set to zero, and the Metatext is set to blank.
Subsequent updates to the Details and Metatext are accompanied by increments in their respective Counters.
The Counters action can be used by clients that are unable to partake in UPnP eventing in order to establish changes in the information provided by the Info Service.
Track
Reports current Track information:
- Uri
- Metadata
Details
Reports current Details information:
- Duration
- Bit Rate
- Bit Depth
- Sample Rate
- Lossless
- Codec Name
Metatext
Reports dynamic textual information. What this currently amounts to is broadcast information from internet radio stations, but the same mechanism could be used for other purposes in the future.
API Reference
Info Service Description (XML)
Migration Guide
None.
Upnp Action Name Changes
None.
Obsolete Functions
None.
