The availability of heterogeneous devices has rapidly changed the way people access theWorldWideWeb that includes rich content\r\napplications such as video streaming, 3D games, video conferencing, and mobile TV. However, most of these devices� (i.e., mobile\r\nphone, PDA, smartphone, and tablet) capabilities differ in terms of built-in software and library (what they can display), display size\r\n(how the content appears), and battery supply (how long the content can be displayed). In order for the digital contents to fit the\r\ntarget device, content adaptation is required. There have been many projects focused on energy-aware-based content adaptation\r\nthat have been designed with different goals and approaches. This paper reviews some of the representative content adaptation\r\nsolutions that have been proposed during the last few years, in relation to energy consumption focusing on wireless multimedia\r\nstreaming in mobile devices. Also, this paper categorizes the research work according to different classifications of multimedia\r\ncontent adaptation requirements. In addition, we discuss some energy-related challenges content adaptation systems.
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