This article presents the latest developments in MMAPI: the new security considerations raised in MMAPI 1.1, the differences between MMAPI and the MIDP 2.0 Media API, J2ME Wireless Toolkit 2.2 support for MMAPI, and JSR 234, Advanced Multimedia Supplement
Tutorial Details:
The Mobile Media API (MMAPI) is an optional package within the Java 2 Platform, Micro Edition (J2ME), that provides a standard API for rendering and capturing time-based media, such as audio tracks and video clips. Developed within the Java Community process as JSR 135, MMAPI was designed to be flexible and platform-independent; it makes no assumptions about media formats, protocols, or features supported by various devices. MMAPI is already making its way into mobile devices; the Nokia 3650, for example, includes an implementation. Other devices that support MMAPI can be found at "J2ME Devices."
This article services the latest developments in MMAPI: the new security considerations raised in MMAPI 1.1, the differences between MMAPI and the MIDP 2.0 Media API, J2ME Wireless Toolkit 2.2 support for MMAPI, and JSR 234, Advanced Multimedia Supplements. If you're looking for a tutorial on MMAPI as well as code samples, for an audio/video player, for instance, see the articles "The J2ME Mobile Media API" and "Taking Pictures With MMAPI."
Overview of MMAPI Components
MMAPI has four main components:
Player is used to play content. It provides methods to manage a Player's life-cycle, and to manage various playback features.
Manager is the overall controller of the media. It creates Players.
DataSource represents a protocol handler, usually not visible to the application developer. The protocol handler reads the media data and fetches it to Player for playback.
Control controls various features of Player and playback operations.
Supported MMAPI Controls
MMAPI has 12 controls, in the package javax.microedition.control:
MetaDataControl retrieves metadata information from the media.
MIDIControl provides access to MIDI rendering and transmitting devices.
GUIControl represents a control that provides a UI component.
PitchControl raises or lowers the playback pitch without changing the playback speed.
RateControl controls the playback rate.
TempoControl controls the tempo of a MIDI song.
VolumeControl controls the volume.
VideoControl controls the display of visual content.
FramePositioningControl enables precise positioning to a video frame.
RecordControl records what is currently being played by the Player.
StopTimeControl enables an application to define a preset stop time for a Player.
ToneControl is an interface that enables playback of user-defined tone sequences.
Be aware that not all MMAPI implementations support all types of controls. You can find out what a device does support by calling System.getProperty(String key). The specification defines these properties:
microedition.media.version returns a string representing the version of MMAPI implemented, "1.0" or "1.1" if MMAPI is supported, or null if it isn't.
supports.mixing returns true if mixing is supported, false if it isn't.
supports.audio.capture returns true if audio capture is supported, false if it isn't.
supports.video.capture returns true if video capture is supported, false if it isn't.
supports.recording returns true if recording is supported, false if it isn't.
audio.encodings returns a string representing the supported audio capture formats, or null if audio capture isn't supported.
video.encodings returns a string representing the supported video capture formats, or null if video capture isn't supported.
video.snapshot.encodings returns a string representing the supported image capture formats, or null if video snapshot isn't supported.
streamable.contents returns a string representing the supported streamable content types, in MIME syntax.
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