Figure 132 Class diagram of the MIDP Sound API in Java

Generation PDF 417 in Java Figure 132 Class diagram of the MIDP Sound API
Figure 132 Class diagram of the MIDP Sound API
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1321 Managing a Media Framework
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The entry point to the Sound API is the Manager class Class Manager provides access to an implementation-specific mechanism for constructing Player objects In addition, class Manager provides means for property queries of content and protocol support For convenience, it also provides a simplified method to generate simple tones Property queries
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The MIDP sound API provides a mechanism for querying the type of content and protocols that the device supports The property queries are enabled by the methods ManagergetSupportedContentTypes and ManagergetSupportedProtocols
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For example, if the given protocol is "http:", then the supported content types that can be played back with the http protocol will be returned If null is passed in as the protocol, all the supported content types for this device will be returned The returned array must be non-empty; in other words, at least one content type has to be supported
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1322 Creating Players for Media Data
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133 Media Controls
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Control objects are used for controlling content-type-specific media processing operations The set of operations are usually functionally related Thus a Control object provides a logical grouping of media-processing functions
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All Control classes implement the interface Controllable, and the Player interface is a subinterface of Controllable Therefore, a Player implementation can use the Control interface to extend its media-processing functions For example, a Player can expose a VolumeControl to allow the volume level to be set
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The javaxmicroeditionmediacontrol package specifies a set of predefined Controls classes In MIDP 20, two controls are specified and required: ToneControl and VolumeControl
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The Controllable interface provides a mechanism for obtaining the Controls from an object such as a Player It provides methods to get all the supported Controls and to obtain a particular Control based on its class name
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1331 ToneControl
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ToneControl is an interface that enables the playback of a user-defined monotonic tone sequence A tone sequence is specified as a list of tone duration pairs and user-defined sequence blocks The list is packaged as an array of bytes The setSequence method is used for defining the sequence for the ToneControl
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Here is the syntax of a tone sequence, described using an Augmented BNF notation (See http://wwwietforg/rfc/rfc2234 for details of the Augmented BNF notation)
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sequence = version *1tempo_definition *1resolution_definition *block_definition 1*sequence_event = VERSION version_number = byte-value = 1 ; version # 1
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version VERSION version_number
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tempo_definition = TEMPO tempo_modifier TEMPO = byte-value tempo_modifier = byte-value ; multiply by 4 to get the tempo (in bpm) used ; in the sequence resolution_definition = RESOLUTION resolution_unit RESOLUTION = byte-value resolution_unit = byte-value = BLOCK_START block_number 1*sequence_event BLOCK_END block_number BLOCK_START = byte-value BLOCK_END = byte-value block_number = byte-value ; block_number specified in BLOCK_END has to be block_definition
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134 Enhanced Media Support Using the Mobile Media API
As discussed earlier in this chapter, MIDP Sound API is a subset of the Mobile Media API (MMAPI) defined by the Java Community Process effort JSR 135 MMAPI includes a lot of additional functionality that is not present in the MIDP 20 Sound API The additional features introduced by the Mobile Media API include the following: Custom protocols through the DataSource
Synchronization of multiple Players using the TimeBase interface
Interactive synthetic audio
Video and camera functionality
Capture and recording
Metadata
The scalability and optional use of the API is crucial for the successful deployment of the API in mobile devices It is clear that not all implementations of MMAPI will support all multimedia types and input protocols For example, some of the devices may support only playback of local audio files The design of the MMAPI allows implementations to provide optional support for different media types and protocols
As with the MIDP 20 Sound API, class Manager provides the getSupportedContentTypes and getSupportedProtocols methods to query for supported media types and protocols An application can also attempt to create a Player from class Manager given the media input If the content type or the protocol specified is not supported, the Player creation methods will throw an exception
Because MMAPI is an optional package, it does not mandate any particular media types or protocols Required types and protocols are to be determined by the appropriate profiles adopting MMAPI (for example MIDP 20) However, an implementation must guarantee support of at least one media type and protocol
MMAPI also allows implementations to support optional features For example, some implementations may support only media playback but not recording MMAPI allows implementations to expose these optional features as applicable
Optional features are organized as Control classes A Player can be queried for all of its supported Controls using the method getControls or a particular type of Control using the method getControl
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