/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * v4l2_camera.h - V4L2 compatibility camera
 */

#pragma once

#include <deque>
#include <utility>

#include <libcamera/base/mutex.h>
#include <libcamera/base/semaphore.h>
#include <libcamera/base/shared_fd.h>

#include <libcamera/camera.h>
#include <libcamera/framebuffer.h>
#include <libcamera/framebuffer_allocator.h>

class V4L2Camera
{
public:
	struct Buffer {
		Buffer(unsigned int index, const libcamera::FrameMetadata &data)
			: index_(index), data_(data)
		{
		}

		unsigned int index_;
		libcamera::FrameMetadata data_;
	};

	V4L2Camera(std::shared_ptr<libcamera::Camera> camera);
	~V4L2Camera();

	int open(libcamera::StreamConfiguration *streamConfig);
	void close();
	void bind(int efd);
	void unbind();

	std::vector<Buffer> completedBuffers();

	int configure(libcamera::StreamConfiguration *streamConfigOut,
		      const libcamera::Size &size,
		      const libcamera::PixelFormat &pixelformat,
		      unsigned int bufferCount);
	int validateConfiguration(const libcamera::PixelFormat &pixelformat,
				  const libcamera::Size &size,
				  libcamera::StreamConfiguration *streamConfigOut);

	int allocBuffers(unsigned int count);
	void freeBuffers();
	int getBufferFd(unsigned int index);

	int streamOn();
	int streamOff();

	int qbuf(unsigned int index);

	void waitForBufferAvailable();
	bool isBufferAvailable();

	bool isRunning();

private:
	void requestComplete(libcamera::Request *request);

	std::shared_ptr<libcamera::Camera> camera_;
	std::unique_ptr<libcamera::CameraConfiguration> config_;

	bool isRunning_;

	libcamera::Mutex bufferLock_;
	libcamera::FrameBufferAllocator *bufferAllocator_;

	std::vector<std::unique_ptr<libcamera::Request>> requestPool_;

	std::deque<libcamera::Request *> pendingRequests_;
	std::deque<std::unique_ptr<Buffer>> completedBuffers_;

	int efd_;

	libcamera::Mutex bufferMutex_;
	libcamera::ConditionVariable bufferCV_;
	unsigned int bufferAvailableCount_;
};
cons/battery-charging.svg?h=vivid-pre-a07968bed276&amp;id=f71c76ceff7ad13490fd77800059ab2bd2a61498'>diff</a></td><td class='form'><form class='right' method='get' action='/libcamera/vivid.git/log/src/qcam/assets/feathericons/battery-charging.svg'>
<input type='hidden' name='h' value='vivid-pre-a07968bed276'/><input type='hidden' name='id' value='f71c76ceff7ad13490fd77800059ab2bd2a61498'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/libcamera/vivid.git/tree/?h=vivid-pre-a07968bed276&amp;id=f71c76ceff7ad13490fd77800059ab2bd2a61498'>root</a>/<a href='/libcamera/vivid.git/tree/src?h=vivid-pre-a07968bed276&amp;id=f71c76ceff7ad13490fd77800059ab2bd2a61498'>src</a>/<a href='/libcamera/vivid.git/tree/src/qcam?h=vivid-pre-a07968bed276&amp;id=f71c76ceff7ad13490fd77800059ab2bd2a61498'>qcam</a>/<a href='/libcamera/vivid.git/tree/src/qcam/assets?h=vivid-pre-a07968bed276&amp;id=f71c76ceff7ad13490fd77800059ab2bd2a61498'>assets</a>/<a href='/libcamera/vivid.git/tree/src/qcam/assets/feathericons?h=vivid-pre-a07968bed276&amp;id=f71c76ceff7ad13490fd77800059ab2bd2a61498'>feathericons</a>/<a href='/libcamera/vivid.git/tree/src/qcam/assets/feathericons/battery-charging.svg?h=vivid-pre-a07968bed276&amp;id=f71c76ceff7ad13490fd77800059ab2bd2a61498'>battery-charging.svg</a></div><div class='content'>blob: 644cb59cb67a99eac85c6032d6802df1be3302f0 (<a href='/libcamera/vivid.git/plain/src/qcam/assets/feathericons/battery-charging.svg?h=vivid-pre-a07968bed276&amp;id=f71c76ceff7ad13490fd77800059ab2bd2a61498'>plain</a>)
<table summary='blob content' class='blob'>
<tr><td class='linenumbers'><pre><a id='n1' href='#n1'>1</a>
</pre></td>
<td class='lines'><pre><code><span class="hl kwa">&lt;svg</span> <span class="hl kwb">xmlns</span>=<span class="hl str">&quot;http://www.w3.org/2000/svg&quot;</span> <span class="hl kwb">width</span>=<span class="hl str">&quot;24&quot;</span> <span class="hl kwb">height</span>=<span class="hl str">&quot;24&quot;</span> <span class="hl kwb">viewBox</span>=<span class="hl str">&quot;0 0 24 24&quot;</span> <span class="hl kwb">fill</span>=<span class="hl str">&quot;none&quot;</span> <span class="hl kwb">stroke</span>=<span class="hl str">&quot;currentColor&quot;</span> <span class="hl kwb">stroke-width</span>=<span class="hl str">&quot;2&quot;</span> <span class="hl kwb">stroke-linecap</span>=<span class="hl str">&quot;round&quot;</span> <span class="hl kwb">stroke-linejoin</span>=<span class="hl str">&quot;round&quot;</span> <span class="hl kwb">class</span>=<span class="hl str">&quot;feather feather-battery-charging&quot;</span><span class="hl kwa">&gt;&lt;path</span> <span class="hl kwb">d</span>=<span class="hl str">&quot;M5 18H3a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h3.19M15 6h2a2 2 0 0 1 2 2v8a2 2 0 0 1-2 2h-3.19&quot;</span><span class="hl kwa">&gt;&lt;/path&gt;&lt;line</span> <span class="hl kwb">x1</span>=<span class="hl str">&quot;23&quot;</span> <span class="hl kwb">y1</span>=<span class="hl str">&quot;13&quot;</span> <span class="hl kwb">x2</span>=<span class="hl str">&quot;23&quot;</span> <span class="hl kwb">y2</span>=<span class="hl str">&quot;11&quot;</span><span class="hl kwa">&gt;&lt;/line&gt;&lt;polyline</span> <span class="hl kwb">points</span>=<span class="hl str">&quot;11 6 7 12 13 12 9 18&quot;</span><span class="hl kwa">&gt;&lt;/polyline&gt;&lt;/svg&gt;</span>
</code></pre></td></tr></table>
</div> <!-- class=content -->
<div class='footer'>generated by <a href='https://git.zx2c4.com/cgit/about/'>cgit v1.2.1</a> (<a href='https://git-scm.com/'>git 2.18.0</a>) at 2024-12-21 15:54:53 +0000</div>
</div> <!-- id=cgit -->
</body>
</html>