Media layer is composed of Audio, Video as well as Other Technologies to make Unique Applications An apparent revolution in the business of communication - iPhone - has got its outstanding operating system called iOS. That apple iphone applications developers can make the best from the gadget in the course of iPhone app development, the operating system is separated into four layers: Cocoa Touch Layer (upper layer), Media Layer, Core Services Layer and Core OS Layer (deepest layer). It would be very important for iPhone application developers to get in depth knowledge of all these layers. Let us have a quick look at first couple of layers. The very first layer - Cocoa Touch - is as well labeled as upper layer and is essential for iPhone. The most important objective regarding this particular layer is to supply suitable frameworks that give infrastructure which iPhone application developer can use to construct applications. Probably the most utilized frameworks are definitely the UIKit framework, Foundation Framework, Core Foundation Framework etc. During iPhone application development, iPhone application developers implement UIKit to implement graphical user interface. The Foundation framework is utilized to communicate with the Core Foundation Framework within the lower Core Services Layer, which provides all the additional accessible development features. Media layer should be invoked whenever the application wants multimedia services. Each of the graphics, audio as well as video technologies are included in this layer which motivate iPhone apps developers to create ravishing apps. The Core Graphics framework supplies the interfaces for the Quartz 2D drawing API. Quartz is the same advanced, vector-based drawing engine that is used in Mac OS X. It provides help for path-based drawing, anti-aliased rendering, gradients, images, colors, coordinate-space transformations, and PDF document creation, display, and parsing. Inspite of the fact that the API is C based, it functions with object-based abstractions. It is helpful to work for fundamental drawing objects, which makes it simpler to save and reuse graphics content. The Quartz Core framework is composed of the Core Animation interfaces which is an advanced animation and compositing technology that utilizes an optimized rendering path to implement complicated animations as well as visual effects. With a motive for configuring animations and effects, it contains a high-level Objective-C interface. Having configured these, they will be then rendered in hardware to achieve performance. Core Animation is involved into numerous portions of iPhone Operating system, such as UIKit classes for example UIView, supplying animations for numerous standard system behaviors. To generate custom animations, the companies supplying iPhone applications development in India make use of the Objective-C interface in this framework. To supply the users along with an great audio experience, iPhone Operating system http://www.tatvasoft.com/ consists of sharp audio technologies. The technologies facilitate developers develop applications that can play back or record high-quality audio and generate the vibration feature on devices that support those functionalities. The audio formats that get supported by the audio technologies in iPhone OS are AAC, Apple Lossless (ALAC), a-law, HE-ACC (MPEG-4 High Efficiency ACC), iLBC(Internet Low Bitrate Codec), MP3(MPEG-1 audio layer 3), IMA/ADPCM (IMA4), Linear PCM. The operating system of iPhone can handle full-screen video playback by Media Player framework. Using this framework, one can playback movie files applying .mov, .mp4, .m4v, and .3gp filename extensions. To facilitate playback of movie files, below compression standards are used: H.264 Baseline Profile Level 3.0 video, up to 640 x 480 at 30 fps. Keep in mind that B frames aren't supported in the Baseline profile MPEG-4 Part 2 video (Simple Profile) AAC-LC audio, up to 48 kHz Many audio formats, such as the ones listed in ''Audio Technologies'' The developers who are well-versed with these four layers, their importance in the general development process, iPhone application development is actually an extraordinary creative experience. http://www.tatvasoft.com/.