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<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) 2020, Collabora Ltd.</span>
<span class="hl com"> *     Author: Nicolas Dufresne &lt;nicolas.dufresne&#64;collabora.com&gt;</span>
<span class="hl com"> *</span>
<span class="hl com"> * gstlibcameraprovider.c - GStreamer Device Provider</span>
<span class="hl com"> */</span>

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

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

<span class="hl ppc">#include</span> <span class="hl pps">&quot;gstlibcamerasrc.h&quot;</span><span class="hl ppc"></span>
<span class="hl ppc">#include</span> <span class="hl pps">&quot;gstlibcamera-utils.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">GST_DEBUG_CATEGORY_STATIC</span><span class="hl opt">(</span>provider_debug<span class="hl opt">);</span>
<span class="hl ppc">#define GST_CAT_DEFAULT provider_debug</span>

<span class="hl com">/**</span>
<span class="hl com"> * \struct _GstLibcameraDevice</span>
<span class="hl com"> * \brief libcamera GstDevice implementation</span>
<span class="hl com"> *</span>
<span class="hl com"> * This object is used by GstLibcameraProvider to abstract a libcamera</span>
<span class="hl com"> * device. It also provides helpers to create and configure the</span>
<span class="hl com"> * libcamerasrc GstElement to be used with this device. The implementation is</span>
<span class="hl com"> * private to the plugin.</span>
<span class="hl com"> */</span>

<span class="hl kwb">enum</span> <span class="hl opt">{</span>
	PROP_DEVICE_NAME <span class="hl opt">=</span> <span class="hl num">1</span><span class="hl opt">,</span>
<span class="hl opt">};</span>

<span class="hl ppc">#define GST_TYPE_LIBCAMERA_DEVICE gst_libcamera_device_get_type()</span>
<span class="hl kwd">G_DECLARE_FINAL_TYPE</span><span class="hl opt">(</span>GstLibcameraDevice<span class="hl opt">,</span> gst_libcamera_device<span class="hl opt">,</span>
		     GST_LIBCAMERA<span class="hl opt">,</span> DEVICE<span class="hl opt">,</span> GstDevice<span class="hl opt">);</span>

<span class="hl kwb">struct</span> _GstLibcameraDevice <span class="hl opt">{</span>
	GstDevice parent<span class="hl opt">;</span>
	gchar <span class="hl opt">*</span>name<span class="hl opt">;</span>
<span class="hl opt">};</span>

<span class="hl kwd">G_DEFINE_TYPE</span><span class="hl opt">(</span>GstLibcameraDevice<span class="hl opt">,</span> gst_libcamera_device<span class="hl opt">,</span> GST_TYPE_DEVICE<span class="hl opt">);</span>

<span class="hl kwb">static</span> GstElement <span class="hl opt">*</span>
<span class="hl kwd">gst_libcamera_device_create_element</span><span class="hl opt">(</span>GstDevice <span class="hl opt">*</span>device<span class="hl opt">,</span> <span class="hl kwb">const</span> gchar <span class="hl opt">*</span>name<span class="hl opt">)</span>
<span class="hl opt">{</span>
	GstElement <span class="hl opt">*</span>source <span class="hl opt">=</span> <span class="hl kwd">gst_element_factory_make</span><span class="hl opt">(</span><span class="hl str">&quot;libcamerasrc&quot;</span><span class="hl opt">,</span> name<span class="hl opt">);</span>

	<span class="hl com">/*</span>
<span class="hl com">	 * Provider and source lives in the same plugin, so making the source</span>
<span class="hl com">	 * should never fail.</span>
<span class="hl com">	 */</span>
	<span class="hl kwd">g_assert</span><span class="hl opt">(</span>source<span class="hl opt">);</span>

	<span class="hl kwd">g_object_set</span><span class="hl opt">(</span>source<span class="hl opt">,</span> <span class="hl str">&quot;camera-name&quot;</span><span class="hl opt">,</span> <span class="hl kwd">GST_LIBCAMERA_DEVICE</span><span class="hl opt">(</span>device<span class="hl opt">)-&gt;</span>name<span class="hl opt">,</span> <span class="hl kwc">nullptr</span><span class="hl opt">);</span>

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

<span class="hl kwb">static</span> gboolean
<span class="hl kwd">gst_libcamera_device_reconfigure_element</span><span class="hl opt">(</span>GstDevice <span class="hl opt">*</span>device<span class="hl opt">,</span>
					 GstElement <span class="hl opt">*</span>element<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwa">if</span> <span class="hl opt">(!</span><span class="hl kwd">GST_LIBCAMERA_IS_SRC</span><span class="hl opt">(</span>element<span class="hl opt">))</span>
		<span class="hl kwa">return</span> FALSE<span class="hl opt">;</span>

	<span class="hl kwd">g_object_set</span><span class="hl opt">(</span>element<span class="hl opt">,</span> <span class="hl str">&quot;camera-name&quot;</span><span class="hl opt">,</span> <span class="hl kwd">GST_LIBCAMERA_DEVICE</span><span class="hl opt">(</span>device<span class="hl opt">)-&gt;</span>name<span class="hl opt">,</span> <span class="hl kwc">nullptr</span><span class="hl opt">);</span>

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

<span class="hl kwb">static void</span>
<span class="hl kwd">gst_libcamera_device_set_property</span><span class="hl opt">(</span>GObject <span class="hl opt">*</span>object<span class="hl opt">,</span> guint prop_id<span class="hl opt">,</span>
				  <span class="hl kwb">const</span> GValue <span class="hl opt">*</span>value<span class="hl opt">,</span> GParamSpec <span class="hl opt">*</span>pspec<span class="hl opt">)</span>
<span class="hl opt">{</span>
	GstLibcameraDevice <span class="hl opt">*</span>device <span class="hl opt">=</span> <span class="hl kwd">GST_LIBCAMERA_DEVICE</span><span class="hl opt">(</span>object<span class="hl opt">);</span>

	<span class="hl kwa">switch</span> <span class="hl opt">(</span>prop_id<span class="hl opt">) {</span>
	<span class="hl kwa">case</span> PROP_DEVICE_NAME<span class="hl opt">:</span>
		device<span class="hl opt">-&gt;</span>name <span class="hl opt">=</span> <span class="hl kwd">g_value_dup_string</span><span class="hl opt">(</span>value<span class="hl opt">);</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>
	<span class="hl kwa">default</span><span class="hl opt">:</span>
		<span class="hl kwd">G_OBJECT_WARN_INVALID_PROPERTY_ID</span><span class="hl opt">(</span>object<span class="hl opt">,</span> prop_id<span class="hl opt">,</span> pspec<span class="hl opt">);</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>

<span class="hl kwb">static void</span>
<span class="hl kwd">gst_libcamera_device_init</span><span class="hl opt">(</span>GstLibcameraDevice <span class="hl opt">*</span>self<span class="hl opt">)</span>
<span class="hl opt">{</span>
<span class="hl opt">}</span>

<span class="hl kwb">static void</span>
<span class="hl kwd">gst_libcamera_device_finalize</span><span class="hl opt">(</span>GObject <span class="hl opt">*</span>object<span class="hl opt">)</span>
<span class="hl opt">{</span>
	GstLibcameraDevice <span class="hl opt">*</span>self <span class="hl opt">=</span> <span class="hl kwd">GST_LIBCAMERA_DEVICE</span><span class="hl opt">(</span>object<span class="hl opt">);</span>
	gpointer klass <span class="hl opt">=</span> gst_libcamera_device_parent_class<span class="hl opt">;</span>

	<span class="hl kwd">g_free</span><span class="hl opt">(</span>self<span class="hl opt">-&gt;</span>name<span class="hl opt">);</span>

	<span class="hl kwd">G_OBJECT_GET_CLASS</span><span class="hl opt">(</span>klass<span class="hl opt">)-&gt;</span><span class="hl kwd">finalize</span><span class="hl opt">(</span>object<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">static void</span>
<span class="hl kwd">gst_libcamera_device_class_init</span><span class="hl opt">(</span>GstLibcameraDeviceClass <span class="hl opt">*</span>klass<span class="hl opt">)</span>
<span class="hl opt">{</span>
	GstDeviceClass <span class="hl opt">*</span>device_class <span class="hl opt">=</span> <span class="hl kwd">GST_DEVICE_CLASS</span><span class="hl opt">(</span>klass<span class="hl opt">);</span>
	GObjectClass <span class="hl opt">*</span>object_class <span class="hl opt">=</span> <span class="hl kwd">G_OBJECT_CLASS</span><span class="hl opt">(</span>klass<span class="hl opt">);</span>

	device_class<span class="hl opt">-&gt;</span>create_element <span class="hl opt">=</span> gst_libcamera_device_create_element<span class="hl opt">;</span>
	device_class<span class="hl opt">-&gt;</span>reconfigure_element <span class="hl opt">=</span> gst_libcamera_device_reconfigure_element<span class="hl opt">;</span>

	object_class<span class="hl opt">-&gt;</span>set_property <span class="hl opt">=</span> gst_libcamera_device_set_property<span class="hl opt">;</span>
	object_class<span class="hl opt">-&gt;</span>finalize <span class="hl opt">=</span> gst_libcamera_device_finalize<span class="hl opt">;</span>

	GParamSpec <span class="hl opt">*</span>pspec <span class="hl opt">=</span> <span class="hl kwd">g_param_spec_string</span><span class="hl opt">(</span><span class="hl str">&quot;name&quot;</span><span class="hl opt">,</span> <span class="hl str">&quot;Name&quot;</span><span class="hl opt">,</span>
						<span class="hl str">&quot;The name of the camera device&quot;</span><span class="hl opt">,</span> <span class="hl str">&quot;&quot;</span><span class="hl opt">,</span>
						<span class="hl opt">(</span>GParamFlags<span class="hl opt">)(</span>G_PARAM_STATIC_STRINGS <span class="hl opt">|</span> G_PARAM_WRITABLE <span class="hl opt">|</span>
							      G_PARAM_CONSTRUCT_ONLY<span class="hl opt">));</span>
	<span class="hl kwd">g_object_class_install_property</span><span class="hl opt">(</span>object_class<span class="hl opt">,</span> PROP_DEVICE_NAME<span class="hl opt">,</span> pspec<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">static</span> GstDevice <span class="hl opt">*</span>
<span class="hl kwd">gst_libcamera_device_new</span><span class="hl opt">(</span><span class="hl kwb">const</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; &amp;</span>camera<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwd">g_autoptr</span><span class="hl opt">(</span>GstCaps<span class="hl opt">)</span> caps <span class="hl opt">=</span> <span class="hl kwd">gst_caps_new_empty</span><span class="hl opt">();</span>
	<span class="hl kwb">const</span> gchar <span class="hl opt">*</span>name <span class="hl opt">=</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">name</span><span class="hl opt">().</span><span class="hl kwd">c_str</span><span class="hl opt">();</span>
	StreamRoles roles<span class="hl opt">;</span>

	roles<span class="hl opt">.</span><span class="hl kwd">push_back</span><span class="hl opt">(</span><span class="hl kwc">StreamRole</span><span class="hl opt">::</span>VideoRecording<span class="hl opt">);</span>
	<span class="hl kwc">std</span><span class="hl opt">::</span>unique_ptr<span class="hl opt">&lt;</span>CameraConfiguration<span class="hl opt">&gt;</span> config <span class="hl opt">=</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">generateConfiguration</span><span class="hl opt">(</span>roles<span class="hl opt">);</span>

	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">const</span> StreamConfiguration <span class="hl opt">&amp;</span>stream_cfg <span class="hl opt">: *</span>config<span class="hl opt">) {</span>
		GstCaps <span class="hl opt">*</span>sub_caps <span class="hl opt">=</span> <span class="hl kwd">gst_libcamera_stream_formats_to_caps</span><span class="hl opt">(</span>stream_cfg<span class="hl opt">.</span><span class="hl kwd">formats</span><span class="hl opt">());</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>sub_caps<span class="hl opt">)</span>
			<span class="hl kwd">gst_caps_append</span><span class="hl opt">(</span>caps<span class="hl opt">,</span> sub_caps<span class="hl opt">);</span>
	<span class="hl opt">}</span>

	<span class="hl kwa">return</span> <span class="hl kwd">GST_DEVICE</span><span class="hl opt">(</span><span class="hl kwd">g_object_new</span><span class="hl opt">(</span>GST_TYPE_LIBCAMERA_DEVICE<span class="hl opt">,</span>
				       <span class="hl com">/* \todo Use a unique identifier instead of camera name. */</span>
				       <span class="hl str">&quot;name&quot;</span><span class="hl opt">,</span> name<span class="hl opt">,</span>
				       <span class="hl str">&quot;display-name&quot;</span><span class="hl opt">,</span> name<span class="hl opt">,</span>
				       <span class="hl str">&quot;caps&quot;</span><span class="hl opt">,</span> caps<span class="hl opt">,</span>
				       <span class="hl str">&quot;device-class&quot;</span><span class="hl opt">,</span> <span class="hl str">&quot;Source/Video&quot;</span><span class="hl opt">,</span>
				       <span class="hl kwc">nullptr</span><span class="hl opt">));</span>
<span class="hl opt">}</span>

<span class="hl com">/**</span>
<span class="hl com"> * \struct _GstLibcameraProvider</span>
<span class="hl com"> * \brief libcamera GstDeviceProvider implementation</span>
<span class="hl com"> *</span>
<span class="hl com"> * This GstFeature is used by GstDeviceMonitor to probe the available</span>
<span class="hl com"> * libcamera devices. The implementation is private to the plugin.</span>
<span class="hl com"> */</span>

<span class="hl kwb">struct</span> _GstLibcameraProvider <span class="hl opt">{</span>
	GstDeviceProvider parent<span class="hl opt">;</span>
	CameraManager <span class="hl opt">*</span>cm<span class="hl opt">;</span>
<span class="hl opt">};</span>

<span class="hl kwd">G_DEFINE_TYPE_WITH_CODE</span><span class="hl opt">(</span>GstLibcameraProvider<span class="hl opt">,</span> gst_libcamera_provider<span class="hl opt">,</span>
			GST_TYPE_DEVICE_PROVIDER<span class="hl opt">,</span>
			<span class="hl kwd">GST_DEBUG_CATEGORY_INIT</span><span class="hl opt">(</span>provider_debug<span class="hl opt">,</span> <span class="hl str">&quot;libcamera-provider&quot;</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span>
						<span class="hl str">&quot;libcamera Device Provider&quot;</span><span class="hl opt">));</span>

<span class="hl kwb">static</span> GList <span class="hl opt">*</span>
<span class="hl kwd">gst_libcamera_provider_probe</span><span class="hl opt">(</span>GstDeviceProvider <span class="hl opt">*</span>provider<span class="hl opt">)</span>
<span class="hl opt">{</span>
	GstLibcameraProvider <span class="hl opt">*</span>self <span class="hl opt">=</span> <span class="hl kwd">GST_LIBCAMERA_PROVIDER</span><span class="hl opt">(</span>provider<span class="hl opt">);</span>
	CameraManager <span class="hl opt">*</span>cm <span class="hl opt">=</span> self<span class="hl opt">-&gt;</span>cm<span class="hl opt">;</span>
	GList <span class="hl opt">*</span>devices <span class="hl opt">=</span> <span class="hl kwc">nullptr</span><span class="hl opt">;</span>
	gint ret<span class="hl opt">;</span>

	<span class="hl kwd">GST_INFO_OBJECT</span><span class="hl opt">(</span>self<span class="hl opt">,</span> <span class="hl str">&quot;Probing cameras using libcamera&quot;</span><span class="hl opt">);</span>

	<span class="hl com">/* \todo Move the CameraMananger start()/stop() calls into</span>
<span class="hl com">	 * GstDeviceProvider start()/stop() virtual function when CameraMananger</span>
<span class="hl com">	 * gains monitoring support. Meanwhile we need to cycle start()/stop()</span>
<span class="hl com">	 * to ensure every probe() calls return the latest list.</span>
<span class="hl com">	 */</span>
	ret <span class="hl opt">=</span> cm<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">GST_ERROR_OBJECT</span><span class="hl opt">(</span>self<span class="hl opt">,</span> <span class="hl str">&quot;Failed to retrieve device list: %s&quot;</span><span class="hl opt">,</span>
				 <span class="hl kwd">g_strerror</span><span class="hl opt">(-</span>ret<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 opt">}</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>shared_ptr<span class="hl opt">&lt;</span>Camera<span class="hl opt">&gt; &amp;</span>camera <span class="hl opt">:</span> cm<span class="hl opt">-&gt;</span><span class="hl kwd">cameras</span><span class="hl opt">()) {</span>
		<span class="hl kwd">GST_INFO_OBJECT</span><span class="hl opt">(</span>self<span class="hl opt">,</span> <span class="hl str">&quot;Found camera &apos;%s&apos;&quot;</span><span class="hl opt">,</span> camera<span class="hl opt">-&gt;</span><span class="hl kwd">name</span><span class="hl opt">().</span><span class="hl kwd">c_str</span><span class="hl opt">());</span>
		devices <span class="hl opt">=</span> <span class="hl kwd">g_list_append</span><span class="hl opt">(</span>devices<span class="hl opt">,</span>
					<span class="hl kwd">g_object_ref_sink</span><span class="hl opt">(</span><span class="hl kwd">gst_libcamera_device_new</span><span class="hl opt">(</span>camera<span class="hl opt">)));</span>
	<span class="hl opt">}</span>

	cm<span class="hl opt">-&gt;</span><span class="hl kwd">stop</span><span class="hl opt">();</span>

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

<span class="hl kwb">static void</span>
<span class="hl kwd">gst_libcamera_provider_init</span><span class="hl opt">(</span>GstLibcameraProvider <span class="hl opt">*</span>self<span class="hl opt">)</span>
<span class="hl opt">{</span>
	GstDeviceProvider <span class="hl opt">*</span>provider <span class="hl opt">=</span> <span class="hl kwd">GST_DEVICE_PROVIDER</span><span class="hl opt">(</span>self<span class="hl opt">);</span>

	self<span class="hl opt">-&gt;</span>cm <span class="hl opt">=</span> <span class="hl kwa">new</span> <span class="hl kwd">CameraManager</span><span class="hl opt">();</span>

	<span class="hl com">/* Avoid devices being duplicated. */</span>
	<span class="hl kwd">gst_device_provider_hide_provider</span><span class="hl opt">(</span>provider<span class="hl opt">,</span> <span class="hl str">&quot;v4l2deviceprovider&quot;</span><span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">static void</span>
<span class="hl kwd">gst_libcamera_provider_finalize</span><span class="hl opt">(</span>GObject <span class="hl opt">*</span>object<span class="hl opt">)</span>
<span class="hl opt">{</span>
	GstLibcameraProvider <span class="hl opt">*</span>self <span class="hl opt">=</span> <span class="hl kwd">GST_LIBCAMERA_PROVIDER</span><span class="hl opt">(</span>object<span class="hl opt">);</span>
	gpointer klass <span class="hl opt">=</span> gst_libcamera_provider_parent_class<span class="hl opt">;</span>

	<span class="hl kwa">delete</span> self<span class="hl opt">-&gt;</span>cm<span class="hl opt">;</span>

	<span class="hl kwa">return</span> <span class="hl kwd">G_OBJECT_GET_CLASS</span><span class="hl opt">(</span>klass<span class="hl opt">)-&gt;</span><span class="hl kwd">finalize</span><span class="hl opt">(</span>object<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">static void</span>
<span class="hl kwd">gst_libcamera_provider_class_init</span><span class="hl opt">(</span>GstLibcameraProviderClass <span class="hl opt">*</span>klass<span class="hl opt">)</span>
<span class="hl opt">{</span>
	GstDeviceProviderClass <span class="hl opt">*</span>provider_class <span class="hl opt">=</span> <span class="hl kwd">GST_DEVICE_PROVIDER_CLASS</span><span class="hl opt">(</span>klass<span class="hl opt">);</span>
	GObjectClass <span class="hl opt">*</span>object_class <span class="hl opt">=</span> <span class="hl kwd">G_OBJECT_CLASS</span><span class="hl opt">(</span>klass<span class="hl opt">);</span>

	provider_class<span class="hl opt">-&gt;</span>probe <span class="hl opt">=</span> gst_libcamera_provider_probe<span class="hl opt">;</span>
	object_class<span class="hl opt">-&gt;</span>finalize <span class="hl opt">=</span> gst_libcamera_provider_finalize<span class="hl opt">;</span>

	<span class="hl kwd">gst_device_provider_class_set_metadata</span><span class="hl opt">(</span>provider_class<span class="hl opt">,</span>
					       <span class="hl str">&quot;libcamera Device Provider&quot;</span><span class="hl opt">,</span>
					       <span class="hl str">&quot;Source/Video&quot;</span><span class="hl opt">,</span>
					       <span class="hl str">&quot;List camera device using libcamera&quot;</span><span class="hl opt">,</span>
					       <span class="hl str">&quot;Nicolas Dufresne &lt;nicolas.dufresne&#64;collabora.com&gt;&quot;</span><span class="hl opt">);</span>
<span class="hl opt">}</span>
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