cdc2620549
The V4L2 requests API provides support to atomically tie controls to a set of buffers. This is especially common for m2m devices. Such a request is represented by an fd that is allocated via MEDIA_IOC_REQUEST_ALLOC and then passed to the various V4L2 functions. Implement a V4L2Request class to wrap such an fd and add the corresponding utility functions. Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
45 lines
777 B
C++
45 lines
777 B
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2025, Ideas On Board
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*
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* V4L2 Request
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*/
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#pragma once
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#include <string>
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#include <linux/videodev2.h>
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#include <libcamera/base/event_notifier.h>
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#include <libcamera/base/log.h>
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#include <libcamera/base/signal.h>
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#include <libcamera/base/unique_fd.h>
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namespace libcamera {
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class V4L2Request : protected Loggable
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{
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public:
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bool isValid() const { return fd_.isValid(); }
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int fd() const { return fd_.get(); }
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int reinit();
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int queue();
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V4L2Request(UniqueFD &&fd);
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Signal<V4L2Request *> requestDone;
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private:
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LIBCAMERA_DISABLE_COPY_AND_MOVE(V4L2Request)
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void requestReady();
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std::string logPrefix() const override;
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UniqueFD fd_;
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EventNotifier fdNotifier_;
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};
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} /* namespace libcamera */
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