external_camera_config.xml

<ExternalCamera>
    <Provider>
        <ignore> <!-- Internal video devices to be ignored by external camera HAL -->
        <!-- <id>0</id> -->  <!-- No leading/trailing spaces -->
        </ignore>
    </Provider>
    <!-- See ExternalCameraUtils.cpp for default values of Device configurations below-->
    <Device>
        <!-- Max JPEG buffer size in bytes-->
        <MaxJpegBufferSize  bytes="8388608"/>  <!-- 8MB (> 2594x1944 YUV420) -->
        <!-- Size of v4l2 buffer queue when streaming >= 30fps -->
        <!-- Larger value: more request can be cached pipeline (less janky) -->
        <!-- Smaller value: use less memory -->
        <NumVideoBuffers  count="4"/>
        <!-- Size of v4l2 buffer queue when streaming < 30fps -->
        <NumStillBuffers  count="2"/>
        <!-- List of maximum fps for various output sizes -->
        <!-- Any image size smaller than the size listed in Limit row will report
        fps (as minimum frame duration) up to the fpsBound value. -->
        <FpsList>
            <!-- width/height must be increasing, fpsBound must be decreasing-->
            <Limit  width="640" height="480" fpsBound="30.0" />
            <Limit  width="1280" height="720" fpsBound="30.0" />
            <Limit  width="1920" height="1080" fpsBound="30.0" />
            <!-- image size larger than the last entry will not be supported-->
        </FpsList>
    </Device>
</ExternalCamera>