{
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    "target": "bcm2835",
    "algorithms": [
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            "rpi.dpc": { }
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                "reference_gain": 1.0,
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                "reference_Y": 12900
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            "rpi.noise":
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                "reference_slope": 2.67
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            {
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                "slope": 0.00842
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            "rpi.sdn": { }
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            "rpi.awb":
            {
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            }
        },
        {
            "rpi.agc":
            {
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                "metering_modes":
                {
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                    {
                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
                    },
                    "centre-weighted":
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                    "short":
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</pre></td>
<td class='lines'><pre><code><span class="hl com">/* SPDX-License-Identifier: LGPL-2.1-or-later */</span>
<span class="hl com">/*</span>
<span class="hl com"> * Copyright (C) 2019, Google Inc.</span>
<span class="hl com"> *</span>
<span class="hl com"> * camera_hal_manager.cpp - libcamera Android Camera Manager</span>
<span class="hl com"> */</span>

<span class="hl ppc">#include</span> <span class="hl pps">&quot;camera_hal_manager.h&quot;</span><span class="hl ppc"></span>

<span class="hl ppc">#include &lt;libcamera/base/log.h&gt;</span>

<span class="hl ppc">#include &lt;libcamera/camera.h&gt;</span>
<span class="hl ppc">#include &lt;libcamera/property_ids.h&gt;</span>

<span class="hl ppc">#include</span> <span class="hl pps">&quot;camera_device.h&quot;</span><span class="hl ppc"></span>

<span class="hl kwa">using namespace</span> libcamera<span class="hl opt">;</span>

<span class="hl kwd">LOG_DECLARE_CATEGORY</span><span class="hl opt">(</span>HAL<span class="hl opt">)</span>

<span class="hl com">/*</span>
<span class="hl com"> * \class CameraHalManager</span>
<span class="hl com"> *</span>
<span class="hl com"> * The HAL camera manager is initializated at camera_module_t &apos;hal_init()&apos; time</span>
<span class="hl com"> * and spawns its own thread where libcamera related events are dispatched to.</span>
<span class="hl com"> * It wraps the libcamera CameraManager operations and provides helpers for the</span>
<span class="hl com"> * camera_module_t operations, to retrieve the number of cameras in the system,</span>
<span class="hl com"> * their static information and to open camera devices.</span>
<span class="hl com"> */</span>

<span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">CameraHalManager</span><span class="hl opt">()</span>
	<span class="hl opt">:</span> <span class="hl kwd">cameraManager_</span><span class="hl opt">(</span><span class="hl kwc">nullptr</span><span class="hl opt">),</span> <span class="hl kwd">callbacks_</span><span class="hl opt">(</span><span class="hl kwc">nullptr</span><span class="hl opt">),</span> <span class="hl kwd">numInternalCameras_</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">),</span>
	  <span class="hl kwd">nextExternalCameraId_</span><span class="hl opt">(</span>firstExternalCameraId_<span class="hl opt">)</span>
<span class="hl opt">{</span>
<span class="hl opt">}</span>

<span class="hl com">/* CameraManager calls stop() in the destructor. */</span>
<span class="hl kwc">CameraHalManager</span><span class="hl opt">::~</span><span class="hl kwd">CameraHalManager</span><span class="hl opt">() =</span> <span class="hl kwa">default</span><span class="hl opt">;</span>

<span class="hl com">/* static */</span>
CameraHalManager <span class="hl opt">*</span><span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">instance</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwb">static</span> CameraHalManager <span class="hl opt">*</span>cameraHalManager <span class="hl opt">=</span> <span class="hl kwa">new</span> CameraHalManager<span class="hl opt">;</span>
	<span class="hl kwa">return</span> cameraHalManager<span class="hl opt">;</span>
<span class="hl opt">}</span>

<span class="hl kwb">int</span> <span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">init</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	cameraManager_ <span class="hl opt">=</span> <span class="hl kwc">std</span><span class="hl opt">::</span>make_unique<span class="hl opt">&lt;</span>CameraManager<span class="hl opt">&gt;();</span>

	<span class="hl com">/*</span>
<span class="hl com">	 * If the configuration file is not available the HAL only supports</span>
<span class="hl com">	 * external cameras. If it exists but it&apos;s not valid then error out.</span>
<span class="hl com">	 */</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>halConfig_<span class="hl opt">.</span><span class="hl kwd">exists</span><span class="hl opt">() &amp;&amp; !</span>halConfig_<span class="hl opt">.</span><span class="hl kwd">isValid</span><span class="hl opt">()) {</span>
		<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Error<span class="hl opt">) &lt;&lt;</span> <span class="hl str">&quot;HAL configuration file is not valid&quot;</span><span class="hl opt">;</span>
		<span class="hl kwa">return</span> <span class="hl opt">-</span>EINVAL<span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl com">/* Support camera hotplug. */</span>
	cameraManager_<span class="hl opt">-&gt;</span>cameraAdded<span class="hl opt">.</span><span class="hl kwd">connect</span><span class="hl opt">(</span><span class="hl kwa">this</span><span class="hl opt">, &amp;</span><span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span>cameraAdded<span class="hl opt">);</span>
	cameraManager_<span class="hl opt">-&gt;</span>cameraRemoved<span class="hl opt">.</span><span class="hl kwd">connect</span><span class="hl opt">(</span><span class="hl kwa">this</span><span class="hl opt">, &amp;</span><span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span>cameraRemoved<span class="hl opt">);</span>

	<span class="hl kwb">int</span> ret <span class="hl opt">=</span> cameraManager_<span class="hl opt">-&gt;</span><span class="hl kwd">start</span><span class="hl opt">();</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>ret<span class="hl opt">) {</span>
		<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Error<span class="hl opt">) &lt;&lt;</span> <span class="hl str">&quot;Failed to start camera manager: &quot;</span>
				<span class="hl opt">&lt;&lt;</span> <span class="hl kwd">strerror</span><span class="hl opt">(-</span>ret<span class="hl opt">);</span>
		cameraManager_<span class="hl opt">.</span><span class="hl kwd">reset</span><span class="hl opt">();</span>
		<span class="hl kwa">return</span> ret<span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl kwa">return</span> <span class="hl num">0</span><span class="hl opt">;</span>
<span class="hl opt">}</span>

<span class="hl kwc">std</span><span class="hl opt">::</span>tuple<span class="hl opt">&lt;</span>CameraDevice <span class="hl opt">*,</span> <span class="hl kwb">int</span><span class="hl opt">&gt;</span>
<span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">open</span><span class="hl opt">(</span><span class="hl kwb">unsigned int</span> id<span class="hl opt">,</span> <span class="hl kwb">const</span> hw_module_t <span class="hl opt">*</span>hardwareModule<span class="hl opt">)</span>
<span class="hl opt">{</span>
	MutexLocker <span class="hl kwd">locker</span><span class="hl opt">(</span>mutex_<span class="hl opt">);</span>

	<span class="hl kwa">if</span> <span class="hl opt">(!</span>callbacks_<span class="hl opt">) {</span>
		<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Error<span class="hl opt">) &lt;&lt;</span> <span class="hl str">&quot;Can&apos;t open camera before callbacks are set&quot;</span><span class="hl opt">;</span>
		<span class="hl kwa">return</span> <span class="hl opt">{</span> <span class="hl kwc">nullptr</span><span class="hl opt">, -</span>ENODEV <span class="hl opt">};</span>
	<span class="hl opt">}</span>

	CameraDevice <span class="hl opt">*</span>camera <span class="hl opt">=</span> <span class="hl kwd">cameraDeviceFromHalId</span><span class="hl opt">(</span>id<span class="hl opt">);</span>
	<span class="hl kwa">if</span> <span class="hl opt">(!</span>camera<span class="hl opt">) {</span>
		<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Error<span class="hl opt">) &lt;&lt;</span> <span class="hl str">&quot;Invalid camera id &apos;&quot;</span> <span class="hl opt">&lt;&lt;</span> id <span class="hl opt">&lt;&lt;</span> <span class="hl str">&quot;&apos;&quot;</span><span class="hl opt">;</span>
		<span class="hl kwa">return</span> <span class="hl opt">{</span> <span class="hl kwc">nullptr</span><span class="hl opt">, -</span>ENODEV <span class="hl opt">};</span>
	<span class="hl opt">}</span>

	<span class="hl kwb">int</span> ret <span class="hl opt">=</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">open</span><span class="hl opt">(</span>hardwareModule<span class="hl opt">);</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>ret<span class="hl opt">)</span>
		<span class="hl kwa">return</span> <span class="hl opt">{</span> <span class="hl kwc">nullptr</span><span class="hl opt">,</span> ret <span class="hl opt">};</span>

	<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Info<span class="hl opt">) &lt;&lt;</span> <span class="hl str">&quot;Open camera &apos;&quot;</span> <span class="hl opt">&lt;&lt;</span> id <span class="hl opt">&lt;&lt;</span> <span class="hl str">&quot;&apos;&quot;</span><span class="hl opt">;</span>

	<span class="hl kwa">return</span> <span class="hl opt">{</span> camera<span class="hl opt">,</span> <span class="hl num">0</span> <span class="hl opt">};</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">cameraAdded</span><span class="hl opt">(</span><span class="hl kwc">std</span><span class="hl opt">::</span>shared_ptr<span class="hl opt">&lt;</span>Camera<span class="hl opt">&gt;</span> cam<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwb">unsigned int</span> id<span class="hl opt">;</span>
	<span class="hl kwb">bool</span> isCameraExternal <span class="hl opt">=</span> <span class="hl kwa">false</span><span class="hl opt">;</span>
	<span class="hl kwb">bool</span> isCameraNew <span class="hl opt">=</span> <span class="hl kwa">false</span><span class="hl opt">;</span>

	MutexLocker <span class="hl kwd">locker</span><span class="hl opt">(</span>mutex_<span class="hl opt">);</span>

	<span class="hl com">/*</span>
<span class="hl com">	 * Each camera is assigned a unique integer ID when it is seen for the</span>
<span class="hl com">	 * first time. If the camera has been seen before, the previous ID is</span>
<span class="hl com">	 * re-used.</span>
<span class="hl com">	 *</span>
<span class="hl com">	 * IDs starts from &apos;0&apos; for internal cameras and &apos;1000&apos; for external</span>
<span class="hl com">	 * cameras.</span>
<span class="hl com">	 */</span>
	<span class="hl kwc">auto</span> iter <span class="hl opt">=</span> cameraIdsMap_<span class="hl opt">.</span><span class="hl kwd">find</span><span class="hl opt">(</span>cam<span class="hl opt">-&gt;</span><span class="hl kwd">id</span><span class="hl opt">());</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>iter <span class="hl opt">!=</span> cameraIdsMap_<span class="hl opt">.</span><span class="hl kwd">end</span><span class="hl opt">()) {</span>
		id <span class="hl opt">=</span> iter<span class="hl opt">-&gt;</span>second<span class="hl opt">;</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>id <span class="hl opt">&gt;=</span> firstExternalCameraId_<span class="hl opt">)</span>
			isCameraExternal <span class="hl opt">=</span> <span class="hl kwa">true</span><span class="hl opt">;</span>
	<span class="hl opt">}</span> <span class="hl kwa">else</span> <span class="hl opt">{</span>
		isCameraNew <span class="hl opt">=</span> <span class="hl kwa">true</span><span class="hl opt">;</span>

		<span class="hl com">/*</span>
<span class="hl com">		 * Now check if this is an external camera and assign</span>
<span class="hl com">		 * its id accordingly.</span>
<span class="hl com">		 */</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span><span class="hl kwd">cameraLocation</span><span class="hl opt">(</span>cam<span class="hl opt">.</span><span class="hl kwd">get</span><span class="hl opt">()) ==</span> <span class="hl kwc">properties</span><span class="hl opt">::</span>CameraLocationExternal<span class="hl opt">) {</span>
			isCameraExternal <span class="hl opt">=</span> <span class="hl kwa">true</span><span class="hl opt">;</span>
			id <span class="hl opt">=</span> nextExternalCameraId_<span class="hl opt">;</span>
		<span class="hl opt">}</span> <span class="hl kwa">else</span> <span class="hl opt">{</span>
			id <span class="hl opt">=</span> numInternalCameras_<span class="hl opt">;</span>
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>

	<span class="hl com">/*</span>
<span class="hl com">	 * The configuration file must be valid, and contain a corresponding</span>
<span class="hl com">	 * entry for internal cameras. External cameras can be initialized</span>
<span class="hl com">	 * without configuration file.</span>
<span class="hl com">	 */</span>
	<span class="hl kwa">if</span> <span class="hl opt">(!</span>isCameraExternal <span class="hl opt">&amp;&amp; !</span>halConfig_<span class="hl opt">.</span><span class="hl kwd">exists</span><span class="hl opt">()) {</span>
		<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Error<span class="hl opt">)</span>
			<span class="hl opt">&lt;&lt;</span> <span class="hl str">&quot;HAL configuration file is mandatory for internal cameras&quot;</span><span class="hl opt">;</span>
		<span class="hl kwa">return</span><span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl kwb">const</span> CameraConfigData <span class="hl opt">*</span>cameraConfigData <span class="hl opt">=</span> halConfig_<span class="hl opt">.</span><span class="hl kwd">cameraConfigData</span><span class="hl opt">(</span>cam<span class="hl opt">-&gt;</span><span class="hl kwd">id</span><span class="hl opt">());</span>

	<span class="hl com">/*</span>
<span class="hl com">	 * Some cameras whose location is reported by libcamera as external may</span>
<span class="hl com">	 * actually be internal to the device. This is common with UVC cameras</span>
<span class="hl com">	 * that are integrated in a laptop. In that case the real location</span>
<span class="hl com">	 * should be specified in the configuration file.</span>
<span class="hl com">	 *</span>
<span class="hl com">	 * If the camera location is external and a configuration entry exists</span>
<span class="hl com">	 * for it, override its location.</span>
<span class="hl com">	 */</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>isCameraNew <span class="hl opt">&amp;&amp;</span> isCameraExternal<span class="hl opt">) {</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>cameraConfigData <span class="hl opt">&amp;&amp;</span> cameraConfigData<span class="hl opt">-&gt;</span>facing <span class="hl opt">!= -</span><span class="hl num">1</span><span class="hl opt">) {</span>
			isCameraExternal <span class="hl opt">=</span> <span class="hl kwa">false</span><span class="hl opt">;</span>
			id <span class="hl opt">=</span> numInternalCameras_<span class="hl opt">;</span>
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>

	<span class="hl kwa">if</span> <span class="hl opt">(!</span>isCameraExternal <span class="hl opt">&amp;&amp; !</span>cameraConfigData<span class="hl opt">) {</span>
		<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Error<span class="hl opt">)</span>
			<span class="hl opt">&lt;&lt;</span> <span class="hl str">&quot;HAL configuration entry for internal camera &quot;</span>
			<span class="hl opt">&lt;&lt;</span> cam<span class="hl opt">-&gt;</span><span class="hl kwd">id</span><span class="hl opt">() &lt;&lt;</span> <span class="hl str">&quot; is missing&quot;</span><span class="hl opt">;</span>
		<span class="hl kwa">return</span><span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl com">/* Create a CameraDevice instance to wrap the libcamera Camera. */</span>
	<span class="hl kwc">std</span><span class="hl opt">::</span>unique_ptr<span class="hl opt">&lt;</span>CameraDevice<span class="hl opt">&gt;</span> camera <span class="hl opt">=</span> <span class="hl kwc">CameraDevice</span><span class="hl opt">::</span><span class="hl kwd">create</span><span class="hl opt">(</span>id<span class="hl opt">,</span> cam<span class="hl opt">);</span>

	<span class="hl kwb">int</span> ret <span class="hl opt">=</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">initialize</span><span class="hl opt">(</span>cameraConfigData<span class="hl opt">);</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>ret<span class="hl opt">) {</span>
		<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Error<span class="hl opt">) &lt;&lt;</span> <span class="hl str">&quot;Failed to initialize camera: &quot;</span> <span class="hl opt">&lt;&lt;</span> cam<span class="hl opt">-&gt;</span><span class="hl kwd">id</span><span class="hl opt">();</span>
		<span class="hl kwa">return</span><span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl kwa">if</span> <span class="hl opt">(</span>isCameraNew<span class="hl opt">) {</span>
		cameraIdsMap_<span class="hl opt">.</span><span class="hl kwd">emplace</span><span class="hl opt">(</span>cam<span class="hl opt">-&gt;</span><span class="hl kwd">id</span><span class="hl opt">(),</span> id<span class="hl opt">);</span>

		<span class="hl kwa">if</span> <span class="hl opt">(</span>isCameraExternal<span class="hl opt">)</span>
			nextExternalCameraId_<span class="hl opt">++;</span>
		<span class="hl kwa">else</span>
			numInternalCameras_<span class="hl opt">++;</span>
	<span class="hl opt">}</span>

	cameras_<span class="hl opt">.</span><span class="hl kwd">emplace_back</span><span class="hl opt">(</span><span class="hl kwc">std</span><span class="hl opt">::</span><span class="hl kwd">move</span><span class="hl opt">(</span>camera<span class="hl opt">));</span>

	<span class="hl kwa">if</span> <span class="hl opt">(</span>callbacks_<span class="hl opt">)</span>
		callbacks_<span class="hl opt">-&gt;</span><span class="hl kwd">camera_device_status_change</span><span class="hl opt">(</span>callbacks_<span class="hl opt">,</span> id<span class="hl opt">,</span>
							CAMERA_DEVICE_STATUS_PRESENT<span class="hl opt">);</span>

	<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Debug<span class="hl opt">) &lt;&lt;</span> <span class="hl str">&quot;Camera ID: &quot;</span> <span class="hl opt">&lt;&lt;</span> id <span class="hl opt">&lt;&lt;</span> <span class="hl str">&quot; added successfully.&quot;</span><span class="hl opt">;</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">cameraRemoved</span><span class="hl opt">(</span><span class="hl kwc">std</span><span class="hl opt">::</span>shared_ptr<span class="hl opt">&lt;</span>Camera<span class="hl opt">&gt;</span> cam<span class="hl opt">)</span>
<span class="hl opt">{</span>
	MutexLocker <span class="hl kwd">locker</span><span class="hl opt">(</span>mutex_<span class="hl opt">);</span>

	<span class="hl kwc">auto</span> iter <span class="hl opt">=</span> <span class="hl kwc">std</span><span class="hl opt">::</span><span class="hl kwd">find_if</span><span class="hl opt">(</span>cameras_<span class="hl opt">.</span><span class="hl kwd">begin</span><span class="hl opt">(),</span> cameras_<span class="hl opt">.</span><span class="hl kwd">end</span><span class="hl opt">(),</span>
				 <span class="hl opt">[&amp;</span>cam<span class="hl opt">](</span><span class="hl kwb">const</span> <span class="hl kwc">std</span><span class="hl opt">::</span>unique_ptr<span class="hl opt">&lt;</span>CameraDevice<span class="hl opt">&gt; &amp;</span>camera<span class="hl opt">) {</span>
					 <span class="hl kwa">return</span> cam <span class="hl opt">==</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">camera</span><span class="hl opt">();</span>
				 <span class="hl opt">});</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>iter <span class="hl opt">==</span> cameras_<span class="hl opt">.</span><span class="hl kwd">end</span><span class="hl opt">())</span>
		<span class="hl kwa">return</span><span class="hl opt">;</span>

	<span class="hl com">/*</span>
<span class="hl com">	 * CAMERA_DEVICE_STATUS_NOT_PRESENT should be set for external cameras</span>
<span class="hl com">	 * only.</span>
<span class="hl com">	 */</span>
	<span class="hl kwb">unsigned int</span> id <span class="hl opt">= (*</span>iter<span class="hl opt">)-&gt;</span><span class="hl kwd">id</span><span class="hl opt">();</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>id <span class="hl opt">&gt;=</span> firstExternalCameraId_<span class="hl opt">)</span>
		callbacks_<span class="hl opt">-&gt;</span><span class="hl kwd">camera_device_status_change</span><span class="hl opt">(</span>callbacks_<span class="hl opt">,</span> id<span class="hl opt">,</span>
							CAMERA_DEVICE_STATUS_NOT_PRESENT<span class="hl opt">);</span>

	<span class="hl com">/*</span>
<span class="hl com">	 * \todo Check if the camera is already open and running.</span>
<span class="hl com">	 * Inform the framework about its absence before deleting its</span>
<span class="hl com">	 * reference here.</span>
<span class="hl com">	 */</span>
	cameras_<span class="hl opt">.</span><span class="hl kwd">erase</span><span class="hl opt">(</span>iter<span class="hl opt">);</span>

	<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Debug<span class="hl opt">) &lt;&lt;</span> <span class="hl str">&quot;Camera ID: &quot;</span> <span class="hl opt">&lt;&lt;</span> id <span class="hl opt">&lt;&lt;</span> <span class="hl str">&quot; removed successfully.&quot;</span><span class="hl opt">;</span>
<span class="hl opt">}</span>

<span class="hl kwb">int32_t</span> <span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">cameraLocation</span><span class="hl opt">(</span><span class="hl kwb">const</span> Camera <span class="hl opt">*</span>cam<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwb">const</span> ControlList <span class="hl opt">&amp;</span>properties <span class="hl opt">=</span> cam<span class="hl opt">-&gt;</span><span class="hl kwd">properties</span><span class="hl opt">();</span>
	<span class="hl kwa">if</span> <span class="hl opt">(!</span>properties<span class="hl opt">.</span><span class="hl kwd">contains</span><span class="hl opt">(</span><span class="hl kwc">properties</span><span class="hl opt">::</span>Location<span class="hl opt">))</span>
		<span class="hl kwa">return</span> <span class="hl opt">-</span><span class="hl num">1</span><span class="hl opt">;</span>

	<span class="hl kwa">return</span> properties<span class="hl opt">.</span><span class="hl kwd">get</span><span class="hl opt">(</span><span class="hl kwc">properties</span><span class="hl opt">::</span>Location<span class="hl opt">);</span>
<span class="hl opt">}</span>

CameraDevice <span class="hl opt">*</span><span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">cameraDeviceFromHalId</span><span class="hl opt">(</span><span class="hl kwb">unsigned int</span> id<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwc">auto</span> iter <span class="hl opt">=</span> <span class="hl kwc">std</span><span class="hl opt">::</span><span class="hl kwd">find_if</span><span class="hl opt">(</span>cameras_<span class="hl opt">.</span><span class="hl kwd">begin</span><span class="hl opt">(),</span> cameras_<span class="hl opt">.</span><span class="hl kwd">end</span><span class="hl opt">(),</span>
				 <span class="hl opt">[</span>id<span class="hl opt">](</span><span class="hl kwb">const</span> <span class="hl kwc">std</span><span class="hl opt">::</span>unique_ptr<span class="hl opt">&lt;</span>CameraDevice<span class="hl opt">&gt; &amp;</span>camera<span class="hl opt">) {</span>
					 <span class="hl kwa">return</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">id</span><span class="hl opt">() ==</span> id<span class="hl opt">;</span>
				 <span class="hl opt">});</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>iter <span class="hl opt">==</span> cameras_<span class="hl opt">.</span><span class="hl kwd">end</span><span class="hl opt">())</span>
		<span class="hl kwa">return</span> <span class="hl kwc">nullptr</span><span class="hl opt">;</span>

	<span class="hl kwa">return</span> iter<span class="hl opt">-&gt;</span><span class="hl kwd">get</span><span class="hl opt">();</span>
<span class="hl opt">}</span>

<span class="hl kwb">unsigned int</span> <span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">numCameras</span><span class="hl opt">()</span> <span class="hl kwb">const</span>
<span class="hl opt">{</span>
	<span class="hl kwa">return</span> numInternalCameras_<span class="hl opt">;</span>
<span class="hl opt">}</span>

<span class="hl kwb">int</span> <span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">getCameraInfo</span><span class="hl opt">(</span><span class="hl kwb">unsigned int</span> id<span class="hl opt">,</span> <span class="hl kwb">struct</span> camera_info <span class="hl opt">*</span>info<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwa">if</span> <span class="hl opt">(!</span>info<span class="hl opt">)</span>
		<span class="hl kwa">return</span> <span class="hl opt">-</span>EINVAL<span class="hl opt">;</span>

	MutexLocker <span class="hl kwd">locker</span><span class="hl opt">(</span>mutex_<span class="hl opt">);</span>

	CameraDevice <span class="hl opt">*</span>camera <span class="hl opt">=</span> <span class="hl kwd">cameraDeviceFromHalId</span><span class="hl opt">(</span>id<span class="hl opt">);</span>
	<span class="hl kwa">if</span> <span class="hl opt">(!</span>camera<span class="hl opt">) {</span>
		<span class="hl kwd">LOG</span><span class="hl opt">(</span>HAL<span class="hl opt">,</span> Error<span class="hl opt">) &lt;&lt;</span> <span class="hl str">&quot;Invalid camera id &apos;&quot;</span> <span class="hl opt">&lt;&lt;</span> id <span class="hl opt">&lt;&lt;</span> <span class="hl str">&quot;&apos;&quot;</span><span class="hl opt">;</span>
		<span class="hl kwa">return</span> <span class="hl opt">-</span>EINVAL<span class="hl opt">;</span>
	<span class="hl opt">}</span>

	info<span class="hl opt">-&gt;</span>facing <span class="hl opt">=</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">facing</span><span class="hl opt">();</span>
	info<span class="hl opt">-&gt;</span>orientation <span class="hl opt">=</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">orientation</span><span class="hl opt">();</span>
	info<span class="hl opt">-&gt;</span>device_version <span class="hl opt">=</span> CAMERA_DEVICE_API_VERSION_3_3<span class="hl opt">;</span>
	info<span class="hl opt">-&gt;</span>resource_cost <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	info<span class="hl opt">-&gt;</span>static_camera_characteristics <span class="hl opt">=</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">getStaticMetadata</span><span class="hl opt">();</span>
	info<span class="hl opt">-&gt;</span>conflicting_devices <span class="hl opt">=</span> <span class="hl kwc">nullptr</span><span class="hl opt">;</span>
	info<span class="hl opt">-&gt;</span>conflicting_devices_length <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>

	<span class="hl kwa">return</span> <span class="hl num">0</span><span class="hl opt">;</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">CameraHalManager</span><span class="hl opt">::</span><span class="hl kwd">setCallbacks</span><span class="hl opt">(</span><span class="hl kwb">const</span> camera_module_callbacks_t <span class="hl opt">*</span>callbacks<span class="hl opt">)</span>
<span class="hl opt">{</span>
	callbacks_ <span class="hl opt">=</span> callbacks<span class="hl opt">;</span>

	MutexLocker <span class="hl kwd">locker</span><span class="hl opt">(</span>mutex_<span class="hl opt">);</span>

	<span class="hl com">/*</span>
<span class="hl com">	 * Some external cameras may have been identified before the callbacks_</span>
<span class="hl com">	 * were set. Iterate all existing external cameras and mark them as</span>
<span class="hl com">	 * CAMERA_DEVICE_STATUS_PRESENT explicitly.</span>
<span class="hl com">	 *</span>
<span class="hl com">	 * Internal cameras are already assumed to be present at module load</span>
<span class="hl com">	 * time by the Android framework.</span>
<span class="hl com">	 */</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">const</span> <span class="hl kwc">std</span><span class="hl opt">::</span>unique_ptr<span class="hl opt">&lt;</span>CameraDevice<span class="hl opt">&gt; &amp;</span>camera <span class="hl opt">:</span> cameras_<span class="hl opt">) {</span>
		<span class="hl kwb">unsigned int</span> id <span class="hl opt">=</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">id</span><span class="hl opt">();</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>id <span class="hl opt">&gt;=</span> firstExternalCameraId_<span class="hl opt">)</span>
			callbacks_<span class="hl opt">-&gt;</span><span class="hl kwd">camera_device_status_change</span><span class="hl opt">(</span>callbacks_<span class="hl opt">,</span> id<span class="hl opt">,</span>
								CAMERA_DEVICE_STATUS_PRESENT<span class="hl opt">);</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>
</code></pre></td></tr></table>
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