hyperion.ng/libsrc/grabber/amlogic/AmlogicGrabber.cpp

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// STL includes
#include <algorithm>
#include <cassert>
#include <iostream>
// Linux includes
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
// Local includes
#include <grabber/AmlogicGrabber.h>
// Flags copied from 'include/linux/amlogic/amports/amvideocap.h' at https://github.com/codesnake/linux-amlogic
#define AMVIDEOCAP_IOC_MAGIC 'V'
#define AMVIDEOCAP_IOW_SET_WANTFRAME_WIDTH _IOW(AMVIDEOCAP_IOC_MAGIC, 0x02, int)
#define AMVIDEOCAP_IOW_SET_WANTFRAME_HEIGHT _IOW(AMVIDEOCAP_IOC_MAGIC, 0x03, int)
// Flags copied from 'include/linux/amlogic/amports/amvstream.h' at https://github.com/codesnake/linux-amlogic
#define AMSTREAM_IOC_MAGIC 'S'
#define AMSTREAM_IOC_GET_VIDEO_DISABLE _IOR(AMSTREAM_IOC_MAGIC, 0x48, unsigned long)
AmlogicGrabber::AmlogicGrabber(const unsigned width, const unsigned height) :
// Minimum required width or height is 160
_width(std::max(160u, width)),
_height(std::max(160u, height)),
_amlogicCaptureDev(-1)
{
std::cout << "[" << __PRETTY_FUNCTION__ << "] constructed(" << _width << "x" << _height << ")" << std::endl;
}
AmlogicGrabber::~AmlogicGrabber()
{
if (_amlogicCaptureDev != -1)
{
if (close(_amlogicCaptureDev) == -1)
{
std::cerr << "[" << __PRETTY_FUNCTION__ << "] Failed to close AMLOGIC device (" << errno << ")" << std::endl;
}
_amlogicCaptureDev = -1;
}
}
void AmlogicGrabber::setVideoMode(const VideoMode videoMode)
{
switch (videoMode) {
case VIDEO_3DSBS:
//vc_dispmanx_rect_set(&_rectangle, 0, 0, _width/2, _height);
break;
case VIDEO_3DTAB:
//vc_dispmanx_rect_set(&_rectangle, 0, 0, _width, _height/2);
break;
case VIDEO_2D:
default:
//vc_dispmanx_rect_set(&_rectangle, 0, 0, _width, _height);
break;
}
}
bool AmlogicGrabber::isVideoPlaying()
{
const std::string videoDevice = "/dev/amvideo";
// Open the video device
int video_fd = open(videoDevice.c_str(), O_RDONLY);
if (video_fd < 0)
{
std::cerr << "Failed to open video device(" << videoDevice << "): " << strerror(errno) << std::endl;
return false;
}
// Check the video disabled flag
int videoDisabled;
if (ioctl(video_fd, AMSTREAM_IOC_GET_VIDEO_DISABLE, &videoDisabled) == -1)
{
std::cerr << "Failed to retrieve video state from device: " << strerror(errno) << std::endl;
close(video_fd);
return false;
}
// Make sure to close the device after use
close(video_fd);
return videoDisabled == 0;
}
int AmlogicGrabber::grabFrame(Image<ColorBgr> & image)
{
// resize the given image if needed
if (image.width() != _width || image.height() != _height)
{
image.resize(_width, _height);
}
// Make sure video is playing, else there is nothing to grab
if (!isVideoPlaying())
{
return -1;
}
// If the device is not open, attempt to open it
if (_amlogicCaptureDev == -1)
{
_amlogicCaptureDev = open("/dev/amvideocap0", O_RDONLY, 0);
// If the device is still not open, there is something wrong
if (_amlogicCaptureDev == -1)
{
std::cerr << "[" << __PRETTY_FUNCTION__ << "] Failed to open the AMLOGIC device (" << errno << "): " << strerror(errno) << std::endl;
return -1;
}
}
if (ioctl(_amlogicCaptureDev, AMVIDEOCAP_IOW_SET_WANTFRAME_WIDTH, _width) == -1 ||
ioctl(_amlogicCaptureDev, AMVIDEOCAP_IOW_SET_WANTFRAME_HEIGHT, _height) == -1)
{
// Failed to configure frame width
std::cerr << "[" << __PRETTY_FUNCTION__ << "] Failed to configure capture size (" << errno << "): " << strerror(errno) << std::endl;
close(_amlogicCaptureDev);
_amlogicCaptureDev = -1;
return -1;
}
// Read the snapshot into the memory
void * image_ptr = image.memptr();
const ssize_t bytesToRead = _width * _height * sizeof(ColorBgr);
const ssize_t bytesRead = pread(_amlogicCaptureDev, image_ptr, bytesToRead, 0);
if (bytesRead == -1)
{
std::cerr << "[" << __PRETTY_FUNCTION__ << "] Read of device failed (erno=" << errno << "): " << strerror(errno) << std::endl;
close(_amlogicCaptureDev);
_amlogicCaptureDev = -1;
return -1;
}
else if (bytesToRead != bytesRead)
{
// Read of snapshot failed
std::cerr << "[" << __PRETTY_FUNCTION__ << "] Capture failed to grab entire image [bytesToRead(" << bytesToRead << ") != bytesRead(" << bytesRead << ")]" << std::endl;
close(_amlogicCaptureDev);
_amlogicCaptureDev = -1;
return -1;
}
// For now we always close the device now and again
static int readCnt = 0;
++readCnt;
if (readCnt > 20)
{
close(_amlogicCaptureDev);
_amlogicCaptureDev = -1;
readCnt = 0;
}
return 0;
}