In computing, the Advanced Multimedia Supplements (also JSR-234 or AMMS) is an API specification for the Java ME platform. Practically speaking, it is an extension to JSR 135 Mobile Media API providing new features, such as positional 3D audio processing, audio and video effects processing, better controls for digital camera, and better support for analog radio tuner including Radio Data System. AMMS was developed under the Java Community Process as JSR 234.
JSR-234 defines six feature sets, namely Media Capabilities, and each define minimum implementation requirements in order to try to avoid fragmentation and to define a common minimal base line for the implementations. Every JSR-234 implementation must support at least one Media Capability. The six Media Capabilities are described in the table below.
Media Capability
Description
Music Capability
Music Capability mandates equalizer and audio level control for the main mix of the application.
3D Audio Capability
3D Audio Capability mandates support for at least one simultaneous 16 kHz / 16 bits 3D audio sound source and for a global reverberator. Distance attenuation behavior and location control must be supported for the sound source.
Camera Capability
Camera Capability mandates support for controlling zoom, flash, focus and burst shooting properties of the main camera of the device (to the extent the camera hardware supports them). It also mandates JPEG encoding for the photos.
Image Encoding Capability
Image Encoding Capability mandates transcoding of Image objects into JPEGs.
Image Post-processing Capability
Image Post-processing Capability is a proper super set of Image Encoding Capability. In addition, Image Post-processing Capability mandates image processing effects (like monochrome and negative), image transformations like mirroring and cropping, and setting of overlays on top of the original image. Furthermore, JPEG to JPEG image processing must be possible.
Tuner Capability
Tuner Capability mandates support for normal FM/AM radio controls like tuning, seeking, squelch, stereo mode, signal strength query and preset. RDS is not mandated.
Optional features
In addition to the Media Capabilities, the device is free to support any of the optional features including:
controlling additional 3D audio features such as Doppler, size of the source (macroscopicity), directivity and obstruction
controlling additional audio effects such as chorus and channel virtualization (including stereo widening)
"3D Audio for Mobile Devices via Java", M. Paavola, E. Karlsson, J. Page; presented at the 118th AES Convention, Barcelona, Spain, May 31st, 2005; available from AES e-library
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