yohhoy

#!/usr/bin/env python3
import cv2
import numpy as np
import sys


def hsv_mask(hsv, h_center, h_range, s_low, v_low):
    h_low = (h_center - h_range) % 180
    h_high = (h_center + h_range) % 180
    h, s, v = cv2.split(hsv)

yohhoy

std::string fmt_ntpts(uint64_t ts)
{
	// 1970/1/1(UNIT time epoch) - 1900/1/1(NTP timestamp epoch)
	const uint32_t offset = (24u * 60 * 60) * 25567;
	time_t t = (ts >> 32) - offset;
	double d = (ts & 0xffffffff) / (double)(1ULL << 32);
	char buf[256];
	size_t n = std::strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%SZ", std::gmtime(&t));
	std::sprintf(buf + n, "%f", d);
	buf[n] = ' ';	// force erase '0'

yohhoy

/*
 * Read video frame with FFmpeg and convert to OpenCV image
 *
 * Copyright (c) 2016 yohhoy
 */
#include <iostream>
#include <vector>
// FFmpeg
extern "C" {
#include <libavformat/avformat.h>

yohhoy

/*
 * Convert from OpenCV image and write movie with FFmpeg
 *
 * Copyright (c) 2016 yohhoy
 */
#include <iostream>
#include <vector>
// FFmpeg
extern "C" {
#include <libavformat/avformat.h>

yohhoy

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
C++ source text converter for PO3OOrO.
Copyright (C) 2016 yohhoy.

PO3OORO: Enhancing the C++ Basic Character Set with Standard Character Mappings
https://isocpp.org/files/papers/PO3OOrO.pdf

Special thanks to http://emojipedia.org/

yohhoy

#!/usr/bin/env python3
import cv2
import numpy as np
import sys

def convert(infile, outfile):
    src = cv2.imread(infile)
    params = [int(cv2.IMWRITE_JPEG_QUALITY), 10]
    _, jpeg = cv2.imencode('.jpg', src, params)
    img = cv2.imdecode(jpeg, 1)

yohhoy

#!/bin/bash

# "hh:mm:ss" to seconds
function hms2sec() {
  hh=$(( 10#`echo $1 | cut -c 1-2` ))
  mm=$(( 10#`echo $1 | cut -c 4-5` ))
  ss=$(( 10#`echo $1 | cut -c 7-8` ))
  echo $(( $hh * 3600 + $mm * 60 + $ss ))
}

yohhoy

AAC

ISO/IEC 14496-3, 1.6.2.1 AudioSpecificConfig

AudioSpecificConfig() {
	audioObjectType = GetAudioObjectType();
	samplingFrequencyIndex; // 4 bslbf
	if (samplingFrequencyIndex == 0xf) {
		samplingFrequency; // 24 uimsbf
	}

yohhoy

/*
 * lwbs.hpp - lightweight bitstream parsing library
 *
 * Copyright (c) 2016 yohhoy
 * Distributed under the Boost Software License, Version 1.0.
 * (See copy at http://www.boost.org/LICENSE_1_0.txt)
 *
 * Requirement:
 *  - C++11 support
 *  - (u)int64_t support

yohhoy

#include <memory>

namespace detail {
template <typename F>
std::shared_ptr<void> set_defer(F f)
{ return std::shared_ptr<void>(nullptr, [f](void*){ return f(); }); }
}

#define SET_DEFER_IMPL2(id_, f_) auto deferobj##id_ = detail::set_defer(f_)
#define SET_DEFER_IMPL1(id_, f_) SET_DEFER_IMPL2(id_, f_)