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91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
/* ---------------------------------------------------------------------------
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** This software is in the public domain, furnished "as is", without technical
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** support, and with no warranty, express or implied, as to its usefulness for
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** any purpose.
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**
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** V4l2Capture.cpp
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**
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** V4L2 wrapper
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**
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** -------------------------------------------------------------------------*/
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// libv4l2
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#include <linux/videodev2.h>
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// project
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#include "logger.h"
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#include "V4l2Capture.h"
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#include "V4l2MmapDevice.h"
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#include "V4l2ReadWriteDevice.h"
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// -----------------------------------------
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// create video capture interface
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// -----------------------------------------
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V4l2Capture* V4l2Capture::create(const V4L2DeviceParameters & param)
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{
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V4l2Capture* videoCapture = NULL;
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V4l2Device* videoDevice = NULL;
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int caps = V4L2_CAP_VIDEO_CAPTURE;
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switch (param.m_iotype)
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{
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case IOTYPE_MMAP:
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videoDevice = new V4l2MmapDevice(param, V4L2_BUF_TYPE_VIDEO_CAPTURE);
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caps |= V4L2_CAP_STREAMING;
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break;
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case IOTYPE_READWRITE:
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videoDevice = new V4l2ReadWriteDevice(param, V4L2_BUF_TYPE_VIDEO_CAPTURE);
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caps |= V4L2_CAP_READWRITE;
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break;
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}
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if (videoDevice && !videoDevice->init(caps))
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{
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delete videoDevice;
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videoDevice=NULL;
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}
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if (videoDevice)
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{
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videoCapture = new V4l2Capture(videoDevice);
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}
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return videoCapture;
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}
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// -----------------------------------------
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// constructor
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// -----------------------------------------
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V4l2Capture::V4l2Capture(V4l2Device* device) : V4l2Access(device)
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{
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}
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// -----------------------------------------
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// destructor
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// -----------------------------------------
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V4l2Capture::~V4l2Capture()
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{
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}
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// -----------------------------------------
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// check readability
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// -----------------------------------------
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bool V4l2Capture::isReadable(timeval* tv)
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{
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int fd = m_device->getFd();
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fd_set fdset;
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FD_ZERO(&fdset);
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FD_SET(fd, &fdset);
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return (select(fd+1, &fdset, NULL, NULL, tv) == 1);
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}
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// -----------------------------------------
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// read from V4l2Device
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// -----------------------------------------
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size_t V4l2Capture::read(char* buffer, size_t bufferSize)
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{
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return m_device->readInternal(buffer, bufferSize);
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}
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