mirror of
https://github.com/hyperion-project/hyperion.ng.git
synced 2023-10-10 13:36:59 +02:00
151 lines
4.2 KiB
C++
151 lines
4.2 KiB
C++
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// STL includes
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#include <algorithm>
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#include <cassert>
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#include <iostream>
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// Linux includes
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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// Local includes
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#include "AmlogicGrabber.h"
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// Flags copied from 'include/linux/amlogic/amports/amvideocap.h' at https://github.com/codesnake/linux-amlogic
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#define AMVIDEOCAP_IOC_MAGIC 'V'
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#define AMVIDEOCAP_IOW_SET_WANTFRAME_WIDTH _IOW(AMVIDEOCAP_IOC_MAGIC, 0x02, int)
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#define AMVIDEOCAP_IOW_SET_WANTFRAME_HEIGHT _IOW(AMVIDEOCAP_IOC_MAGIC, 0x03, int)
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// Flags copied from 'include/linux/amlogic/amports/amvstream.h' at https://github.com/codesnake/linux-amlogic
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#define AMSTREAM_IOC_MAGIC 'S'
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#define AMSTREAM_IOC_GET_VIDEO_DISABLE _IOR(AMSTREAM_IOC_MAGIC, 0x48, unsigned long)
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AmlogicGrabber::AmlogicGrabber(const unsigned width, const unsigned height) :
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// Minimum required width or height is 160
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_width(std::max(160u, width)),
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_height(std::max(160u, height)),
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_amlogicCaptureDev(-1)
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{
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std::cout << "[" << __PRETTY_FUNCTION__ << "] constructed(" << _width << "x" << _height << ")" << std::endl;
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}
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AmlogicGrabber::~AmlogicGrabber()
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{
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if (_amlogicCaptureDev != -1)
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{
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if (close(_amlogicCaptureDev) == -1)
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{
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std::cerr << "[" << __PRETTY_FUNCTION__ << "] Failed to close AMLOGIC device (" << errno << ")" << std::endl;
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}
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_amlogicCaptureDev = -1;
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}
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}
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void AmlogicGrabber::setVideoMode(const VideoMode videoMode)
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{
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switch (videoMode) {
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case VIDEO_3DSBS:
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//vc_dispmanx_rect_set(&_rectangle, 0, 0, _width/2, _height);
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break;
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case VIDEO_3DTAB:
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//vc_dispmanx_rect_set(&_rectangle, 0, 0, _width, _height/2);
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break;
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case VIDEO_2D:
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default:
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//vc_dispmanx_rect_set(&_rectangle, 0, 0, _width, _height);
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break;
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}
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}
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bool AmlogicGrabber::isVideoPlaying()
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{
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const std::string videoDevice = "/dev/amvideo";
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// Open the video device
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int video_fd = open(videoDevice.c_str(), O_RDONLY);
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if (video_fd < 0)
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{
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std::cerr << "Failed to open video device(" << videoDevice << "): " << strerror(errno) << std::endl;
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return false;
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}
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// Check the video disabled flag
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int videoDisabled;
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if (ioctl(video_fd, AMSTREAM_IOC_GET_VIDEO_DISABLE, &videoDisabled) == -1)
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{
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std::cerr << "Failed to retrieve video state from device: " << strerror(errno) << std::endl;
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close(video_fd);
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return false;
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}
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// Make sure to close the device after use
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close(video_fd);
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return videoDisabled == 0;
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}
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int AmlogicGrabber::grabFrame(Image<ColorBgr> & image)
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{
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// resize the given image if needed
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if (image.width() != _width || image.height() != _height)
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{
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image.resize(_width, _height);
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}
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// Make sure video is playing, else there is nothing to grab
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if (!isVideoPlaying())
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{
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return -1;
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}
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// If the device is not open, attempt to open it
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if (_amlogicCaptureDev == -1)
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{
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_amlogicCaptureDev = open("/dev/amvideocap0", O_RDONLY, 0);
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// If the device is still not open, there is something wrong
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if (_amlogicCaptureDev == -1)
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{
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std::cerr << "[" << __PRETTY_FUNCTION__ << "] Failed to open the AMLOGIC device (" << errno << "): " << strerror(errno) << std::endl;
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return -1;
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}
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}
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if (ioctl(_amlogicCaptureDev, AMVIDEOCAP_IOW_SET_WANTFRAME_WIDTH, _width) == -1 ||
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ioctl(_amlogicCaptureDev, AMVIDEOCAP_IOW_SET_WANTFRAME_HEIGHT, _height) == -1)
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{
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// Failed to configure frame width
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std::cerr << "[" << __PRETTY_FUNCTION__ << "] Failed to configure capture size (" << errno << "): " << strerror(errno) << std::endl;
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return -1;
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}
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// Read the snapshot into the memory
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void * image_ptr = image.memptr();
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const ssize_t bytesToRead = _width * _height * sizeof(ColorBgr);
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const ssize_t bytesRead = pread(_amlogicCaptureDev, image_ptr, bytesToRead, 0);
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if (bytesRead == -1)
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{
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std::cerr << "[" << __PRETTY_FUNCTION__ << "] Read of device failed (erno=" << errno << "): " << strerror(errno) << std::endl;
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return -1;
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}
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else if (bytesToRead != bytesRead)
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{
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// Read of snapshot failed
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std::cerr << "[" << __PRETTY_FUNCTION__ << "] Capture failed to grab entire image [bytesToRead(" << bytesToRead << ") != bytesRead(" << bytesRead << ")]" << std::endl;
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return -1;
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}
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// For now we always close the device again
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close(_amlogicCaptureDev);
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_amlogicCaptureDev = -1;
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return 0;
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}
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