Program Listing for File v4l2_video_capture.hpp
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/*
* SPDX-FileCopyrightText: Copyright (c) 2023-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef HOLOSCAN_OPERATORS_V4L2_VIDEO_CAPTURE_V4L2_VIDEO_CAPTURE_HPP
#define HOLOSCAN_OPERATORS_V4L2_VIDEO_CAPTURE_V4L2_VIDEO_CAPTURE_HPP
#include <linux/videodev2.h>
#include <memory>
#include <string>
#include "holoscan/core/operator.hpp"
namespace holoscan::ops {
class V4L2VideoCaptureOp : public Operator {
public:
HOLOSCAN_OPERATOR_FORWARD_ARGS(V4L2VideoCaptureOp)
V4L2VideoCaptureOp() = default;
void setup(OperatorSpec& spec) override;
void start() override;
void initialize() override;
void compute([[maybe_unused]] InputContext& op_input, OutputContext& op_output,
ExecutionContext& context) override;
void stop() override;
private:
Parameter<holoscan::IOSpec*> signal_;
Parameter<std::shared_ptr<Allocator>> allocator_;
Parameter<std::string> device_;
Parameter<uint32_t> width_;
Parameter<uint32_t> height_;
Parameter<uint32_t> num_buffers_;
Parameter<std::string> pixel_format_;
Parameter<bool> pass_through_;
Parameter<uint32_t> exposure_time_;
Parameter<uint32_t> gain_;
void v4l2_initialize();
void v4l2_requestbuffers();
void v4l2_check_formats();
void v4l2_set_mode();
void v4l2_set_formats();
bool v4l2_camera_supports_control(int cid, const char* control_name);
void v4l2_set_camera_control(v4l2_control control, const char* control_name, bool warn);
void v4l2_set_camera_settings();
void v4l2_start();
void v4l2_read_buffer(v4l2_buffer& buf);
struct Buffer {
void* ptr;
size_t length;
};
Buffer* buffers_ = nullptr;
int fd_ = -1;
uint32_t width_use_{0};
uint32_t height_use_{0};
uint32_t pixel_format_use_{V4L2_PIX_FMT_RGBA32};
typedef void (*ConverterFunc)(const void* in, void* rgba, size_t width, size_t height);
ConverterFunc converter_{nullptr};
};
} // namespace holoscan::ops
#endif/* HOLOSCAN_OPERATORS_V4L2_VIDEO_CAPTURE_V4L2_VIDEO_CAPTURE_HPP */