android_camera is autodetected during configuration.
</p>
<p>This device allows capturing from all cameras on an Android device,
which are integrated into the Camera2 NDK API.
</p>
<p>The available cameras are enumerated internally and can be selected
with the <var>camera_index</var> parameter. The input file string is
discarded.
</p>
<p>Generally the back facing camera has index 0 while the front facing
camera has index 1.
</p>
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