docs: Adding TIF one-pager to TV docs in L-Preview

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      <li><a href="<?cs var:toroot ?>preview/tv/tif/index.html">

        TV Input Framework</a></li>

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page.title=TV Input Framework

page.tags=tif

@jd:body

<p>

  Watching live television shows and other continuous, channel-based content is a big part of the

  TV experience. Android supports receiving and playback of live video content through the TV Input

  Framework. This framework provides a unified method for receiving audio and video channel content

  from hardware sources, such as HDMI ports and built-in-tuners, and software sources, such as

  video streamed over the internet.

</p>

<p>

  The framework enables developers to define live TV input sources by implementing a TV input

  service. This service publishes a list of channels and programs to the TV Provider. The live TV

  app on a TV device gets the list of available channels and programs from the TV Provider and

  displays them to a user. When a user selects a specific channel, the live TV app creates a

  session for the associated TV input service through the TV Input Manager, and tells the TV input

  service to tune to the requested channel and play the content to a display surface provided by

  the TV app.

</p>

<img src="{@docRoot}preview/tv/images/tif-overview.png" id="figure1">

<p class="img-caption">

  <strong>Figure 1.</strong> Functional diagram of the TV Input Framework

</p>

<p>

  The TV Input Framework is designed to provide access to a wide variety of live TV input sources

  and bring them together in a single user interface for users to browse, view, and enjoy content.

  Building a TV input service for your content can help make it more accessible on TV devices.

</p>

<p>

  The APIs for the TV Input Framework are available in the L Developer Preview and you can

  review them in the preview API reference docs. However, more changes are planned, so stay tuned

  for additional information with the official Android platform launch.

</p>