/usr/include/ptlib/unix/ptlib/shmvideo.h is in libpt-dev 2.10.11~dfsg-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 | /*
* shmvideo.h
*
* This file contains the class hierarchy for both shared memory video
* input and output devices.
*
* Copyright (c) 2003 Pai-Hsiang Hsiao
* Copyright (c) 1998-2003 Equivalence Pty. Ltd.
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (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.mozilla.org/MPL/
*
* $Revision: 21788 $
* $Author: rjongbloed $
* $Date: 2008-12-11 23:42:13 -0600 (Thu, 11 Dec 2008) $
*/
#ifndef PTLIB_SHMVIDEO_H
#define PTLIB_SHMVIDEO_H
#define P_FORCE_STATIC_PLUGIN
#if P_SHM_VIDEO
#include <ptclib/delaychan.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <semaphore.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#define SHMVIDEO_MAX_WIDTH 512
#define SHMVIDEO_MAX_HEIGHT 512
/*
* maximum frame size is computed using RGB32 storage requirement and
* the dimension.
*/
#define SHMVIDEO_FRAMESIZE (SHMVIDEO_MAX_WIDTH*SHMVIDEO_MAX_HEIGHT*4)
/*
* the shared memory buffer started with a 3-byte header of
* (width, height, bytes per pixel)
*/
#define SHMVIDEO_BUFSIZE (sizeof(long)*3+SHMVIDEO_FRAMESIZE)
#define SEM_NAME_OF_OUTPUT_DEVICE "PVideoOutputDevice_Shm"
class PVideoOutputDevice_Shm : public PVideoOutputDevice
{
PCLASSINFO(PVideoOutputDevice_Shm, PVideoOutputDevice);
public:
/** Create a new video output device.
*/
PVideoOutputDevice_Shm();
/**Open the device given the device name.
*/
virtual PBoolean Open(
const PString & deviceName, /// Device name (filename base) to open
PBoolean startImmediate = PTrue /// Immediately start device
);
/**Determine if the device is currently open.
*/
virtual PBoolean IsOpen();
/**Close the device.
*/
virtual PBoolean Close();
/**Get a list of all of the drivers available.
*/
virtual PStringArray GetDeviceNames() const;
virtual PBoolean SetColourFormat(const PString & colourFormat);
virtual PBoolean SetFrameSize(unsigned width,
unsigned height);
virtual PINDEX GetMaxFrameBytes();
virtual PBoolean SetFrameData(unsigned x,
unsigned y,
unsigned width,
unsigned height,
const BYTE * data,
PBoolean endFrame = PTrue);
/**Indicate frame may be displayed.
*/
virtual PBoolean EndFrame();
protected:
PBoolean shmInit();
PINDEX bytesPerPixel;
sem_t *semLock;
int shmId;
key_t shmKey;
void * shmPtr;
};
#define SEM_NAME_OF_INPUT_DEVICE "PVideoInputDevice_Shm"
class PVideoInputDevice_Shm : public PVideoInputDevice
{
PCLASSINFO(PVideoInputDevice_Shm, PVideoInputDevice);
public:
PVideoInputDevice_Shm();
PBoolean Start();
PBoolean Stop();
PBoolean Open(
const PString & deviceName, /// Device name to open
PBoolean startImmediate = PTrue /// Immediately start device
);
PBoolean IsOpen();
PBoolean Close();
/**Get a list of all of the drivers available.
*/
static PStringArray GetInputDeviceNames();
virtual PStringArray GetDeviceNames() const
{ return GetInputDeviceNames(); }
virtual PBoolean GetFrame(PBYTEArray & frame);
virtual PBoolean GetFrameData(
BYTE * buffer, /// Buffer to receive frame
PINDEX * bytesReturned = NULL /// Optional bytes returned.
);
virtual PBoolean GetFrameDataNoDelay (BYTE *, PINDEX *);
/**Get the minimum & maximum size of a frame on the device.
Default behaviour returns the value 1 to UINT_MAX for both and returns
PFalse.
*/
virtual PBoolean GetFrameSizeLimits(
unsigned & minWidth, /// Variable to receive minimum width
unsigned & minHeight, /// Variable to receive minimum height
unsigned & maxWidth, /// Variable to receive maximum width
unsigned & maxHeight /// Variable to receive maximum height
) ;
virtual PBoolean TestAllFormats();
virtual PBoolean IsCapturing();
virtual PINDEX GetMaxFrameBytes();
protected:
PBoolean shmInit();
PAdaptiveDelay m_pacing;
PINDEX videoFrameSize;
int grabCount;
sem_t *semLock;
int shmId;
key_t shmKey;
void *shmPtr;
};
#endif
#endif // PTLIB_SHMVIDEO_H
|