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#pragma once
#include <ast_video_types.hpp>
#include <boost/asio.hpp>
#include <cassert>
#include <iostream>
#include <mutex>
#include <vector>
namespace ast_video
{
//
// Cursor struct is used in User Mode
//
struct AstCurAttributionTag
{
unsigned int posX;
unsigned int posY;
unsigned int curWidth;
unsigned int curHeight;
unsigned int curType; // 0:mono 1:color 2:disappear cursor
unsigned int curChangeFlag;
};
//
// For storing Cursor Information
//
struct AstCursorTag
{
AstCurAttributionTag attr;
// unsigned char icon[MAX_CUR_OFFSETX*MAX_CUR_OFFSETY*2];
unsigned char *icon; //[64*64*2];
};
//
// For select image format, i.e. 422 JPG420, 444 JPG444, lumin/chrom table, 0
// ~ 11, low to high
//
struct FeaturesTag
{
short jpgFmt; // 422:JPG420, 444:JPG444
short luminTbl;
short chromTbl;
short toleranceNoise;
int w;
int h;
unsigned char *buf;
};
//
// For configure video engine control registers
//
struct ImageInfo
{
short doImageRefresh; // Action 0:motion 1:fullframe 2:quick cursor
char qcValid; // quick cursor enable/disable
unsigned int len;
int crypttype;
char cryptkey[16];
union
{
FeaturesTag features;
AstCursorTag cursorInfo;
} parameter;
};
class SimpleVideoPuller
{
public:
SimpleVideoPuller() : imageInfo(){};
void initialize()
{
std::cout << "Opening /dev/video\n";
videoFd = open("/dev/video", O_RDWR);
if (videoFd == 0)
{
std::cout << "Failed to open /dev/video\n";
throw std::runtime_error("Failed to open /dev/video");
}
std::cout << "Opened successfully\n";
}
RawVideoBuffer readVideo()
{
assert(videoFd != 0);
RawVideoBuffer raw;
imageInfo.doImageRefresh = 1; // full frame refresh
imageInfo.qcValid = 0; // quick cursor disabled
imageInfo.parameter.features.buf =
reinterpret_cast<unsigned char *>(raw.buffer.data());
imageInfo.crypttype = -1;
std::cout << "Writing\n";
int status;
/*
status = write(videoFd, reinterpret_cast<char*>(&imageInfo),
sizeof(imageInfo));
if (status != sizeof(imageInfo)) {
std::cout << "Write failed. Return: " << status << "\n";
perror("perror output:");
}
std::cout << "Write done\n";
*/
std::cout << "Reading\n";
status = read(videoFd, reinterpret_cast<char *>(&imageInfo),
sizeof(imageInfo));
std::cout << "Done reading\n";
if (status != 0)
{
std::cerr << "Read failed with status " << status << "\n";
}
raw.buffer.resize(imageInfo.len);
raw.height = imageInfo.parameter.features.h;
raw.width = imageInfo.parameter.features.w;
if (imageInfo.parameter.features.jpgFmt == 422)
{
raw.mode = YuvMode::YUV420;
}
else
{
raw.mode = YuvMode::YUV444;
}
return raw;
}
private:
int videoFd{};
ImageInfo imageInfo;
};
#if defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
class AsyncVideoPuller
{
public:
using video_callback = std::function<void(RawVideoBuffer &)>;
explicit AsyncVideoPuller(boost::asio::io_context &ioService) :
imageInfo(), devVideo(ioService, open("/dev/video", O_RDWR))
{
videobuf = std::make_shared<RawVideoBuffer>();
imageInfo.doImageRefresh = 1; // full frame refresh
imageInfo.qcValid = 0; // quick cursor disabled
imageInfo.parameter.features.buf =
reinterpret_cast<unsigned char *>(videobuf->buffer.data());
imageInfo.crypttype = -1;
};
void registerCallback(video_callback &callback)
{
std::lock_guard<std::mutex> lock(callbackMutex);
callbacks.push_back(callback);
startRead();
}
void startRead()
{
auto mutableBuffer = boost::asio::buffer(&imageInfo, sizeof(imageInfo));
boost::asio::async_read(devVideo, mutableBuffer,
[this](const boost::system::error_code &ec,
std::size_t bytes_transferred) {
if (ec)
{
std::cerr << "Read failed with status "
<< ec << "\n";
}
else
{
this->readDone();
}
});
}
void readDone()
{
std::cout << "Done reading\n";
videobuf->buffer.resize(imageInfo.len);
videobuf->height = imageInfo.parameter.features.h;
videobuf->width = imageInfo.parameter.features.w;
if (imageInfo.parameter.features.jpgFmt == 422)
{
videobuf->mode = YuvMode::YUV420;
}
else
{
videobuf->mode = YuvMode::YUV444;
}
std::lock_guard<std::mutex> lock(callbackMutex);
for (auto &callback : callbacks)
{
// TODO(ed) call callbacks async and double buffer frames
callback(*videobuf);
}
}
private:
std::shared_ptr<RawVideoBuffer> videobuf;
boost::asio::posix::stream_descriptor devVideo;
ImageInfo imageInfo;
std::mutex callbackMutex;
std::vector<video_callback> callbacks;
};
#endif // defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
} // namespace ast_video
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