JeVois  1.22
JeVois Smart Embedded Machine Vision Toolkit
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CameraDevice.H
Go to the documentation of this file.
1// ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
2//
3// JeVois Smart Embedded Machine Vision Toolkit - Copyright (C) 2020 by Laurent Itti, the University of Southern
4// California (USC), and iLab at USC. See http://iLab.usc.edu and http://jevois.org for information about this project.
5//
6// This file is part of the JeVois Smart Embedded Machine Vision Toolkit. This program is free software; you can
7// redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software
8// Foundation, version 2. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
9// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
10// License for more details. You should have received a copy of the GNU General Public License along with this program;
11// if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
12//
13// Contact information: Laurent Itti - 3641 Watt Way, HNB-07A - Los Angeles, CA 90089-2520 - USA.
14// Tel: +1 213 740 3527 - itti@pollux.usc.edu - http://iLab.usc.edu - http://jevois.org
15// ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
16/*! \file */
17
18#pragma once
19
22
23#include <linux/videodev2.h>
24#include <mutex>
25#include <future>
26#include <atomic>
27
28namespace jevois
29{
30 //! Accessory class to hold all the data associated with a V4L2 camera device
31 /*! This class is used internally by jevois::Camera and is of little use to end users. \ingroup core */
33 {
34 public:
35 //! Constructor opens the device, checks its capabilities, starts run thread
36 /*! When dummy is true, we will just dequeue and requeue the buffers with no processing. */
37 CameraDevice(std::string const & devname, unsigned int const nbufs, bool dummy);
38
39 //! Destructor frees all buffers and closes the device
41
42 //! Get our fd; used by Camera to access controls
43 int getFd() const;
44
45 //! Start streaming
46 void streamOn();
47
48 //! Abort streaming
49 void abortStream();
50
51 //! Stop streaming
52 void streamOff();
53
54 //! Get the next captured buffer
55 void get(RawImage & img);
56
57 //! Indicate that user processing is done with an image previously obtained via get()
58 void done(RawImage & img);
59
60 //! Set the video format and frame rate
61 void setFormat(unsigned int const fmt, unsigned int const capw, unsigned int const caph, float const fps,
62 unsigned int const cropw, unsigned int const croph, int preset = -1);
63
64 private:
65 std::string const itsDevName; //!< Our device or movie file name
66 unsigned int const itsNbufs; //!< Our number of buffers
67
68 int itsFd = -1; // file descriptor we use to grab frames
69 bool itsMplane = false; // true if device uses multiplane V4L2 API
70 VideoBuffers * itsBuffers; // video buffers
71 struct v4l2_format itsFormat { }; // capture format
72
73 std::atomic<bool> itsStreaming;
74 std::future<void> itsRunFuture;
75 bool itsFormatOk;
76 std::atomic<bool> itsRunning;
77
78 mutable std::condition_variable_any itsOutputCondVar;
79 mutable std::timed_mutex itsOutputMtx;
80 RawImage itsOutputImage;
81 RawImage itsConvertedOutputImage;
82 std::vector<size_t> itsDoneIdx;
83 float itsFps = 0.0F;
84
85 mutable std::timed_mutex itsMtx;
86
87 void run();
88 };
89
90} // namespace jevois
Accessory class to hold all the data associated with a V4L2 camera device.
void setFormat(unsigned int const fmt, unsigned int const capw, unsigned int const caph, float const fps, unsigned int const cropw, unsigned int const croph, int preset=-1)
Set the video format and frame rate.
void get(RawImage &img)
Get the next captured buffer.
int getFd() const
Get our fd; used by Camera to access controls.
void streamOff()
Stop streaming.
~CameraDevice()
Destructor frees all buffers and closes the device.
void done(RawImage &img)
Indicate that user processing is done with an image previously obtained via get()
void streamOn()
Start streaming.
void abortStream()
Abort streaming.
A raw image as coming from a V4L2 Camera and/or being sent out to a USB Gadget.
Definition RawImage.H:111
Collection of buffers for V4L2 video frames (Camera or Gadget) with hooks to the MMAP'd areas.
Main namespace for all JeVois classes and functions.
Definition Concepts.dox:2