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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* request.cpp - Capture request handling
*/
#include <libcamera/request.h>
#include <map>
#include <libcamera/buffer.h>
#include <libcamera/camera.h>
#include <libcamera/stream.h>
#include "log.h"
/**
* \file request.h
* \brief Describes a frame capture request to be processed by a camera
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(Request)
/**
* \enum Request::Status
* Request completion status
* \var Request::RequestPending
* The request hasn't completed yet
* \var Request::RequestComplete
* The request has completed
* \var Request::RequestCancelled
* The request has been cancelled due to capture stop
*/
/**
* \class Request
* \brief A frame capture request
*
* A Request allows an application to associate buffers and controls on a
* per-frame basis to be queued to the camera device for processing.
*/
/**
* \brief Create a capture request for a camera
* \param[in] camera The camera that creates the request
*/
Request::Request(Camera *camera)
: camera_(camera), status_(RequestPending)
{
}
/**
* \fn Request::buffers()
* \brief Retrieve the request's streams to buffers map
*
* Return a reference to the map that associates each Stream part of the
* request to the Buffer the Stream output should be directed to.
*
* \return The map of Stream to Buffer
*/
/**
* \brief Set the streams to capture with associated buffers
* \param[in] streamMap The map of streams to buffers
* \return 0 on success or a negative error code otherwise
* \retval -EBUSY Buffers have already been set
*/
int Request::setBuffers(const std::map<Stream *, Buffer *> &streamMap)
{
if (!bufferMap_.empty()) {
LOG(Request, Error) << "Buffers already set";
return -EBUSY;
}
bufferMap_ = streamMap;
return 0;
}
/**
* \var Request::bufferMap_
* \brief Mapping of streams to buffers for this request
*
* The bufferMap_ tracks the buffers associated with each stream. If a stream is
* not utilised in this request there will be no buffer for that stream in the
* map.
*/
/**
* \brief Return the buffer associated with a stream
* \param[in] stream The stream the buffer is associated to
* \return The buffer associated with the stream, or nullptr if the stream is
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