althonos

# https://gist.github.com/althonos/6914b896789d3f2078d1e6237642c35c

[metadata]
name = {name}
version = file: {name}/_version.txt
author = Martin Larralde
author_email = [email protected]
url = https://github.com/althonos/{name}
description = {description}
long_description = file: README.md

Quasimondo

import numpy as np


#input is a RGB numpy array with shape (height,width,3), can be uint,int, float or double, values expected in the range 0..255
#output is a double YUV numpy array with shape (height,width,3), values in the range 0..255
def RGB2YUV( rgb ):
     
    m = np.array([[ 0.29900, -0.16874,  0.50000],
                 [0.58700, -0.33126, -0.41869],
                 [ 0.11400, 0.50000, -0.08131]])

inactivist

"""
Convert a CFFI cdata structure to Python dict.

Based on http://stackoverflow.com/q/20444546/1309774 with conversion of
char[] to Python str.

Usage example:

>>> from cffi import FFI
>>> ffi = FFI()

pyos

import time
import random
import struct
import select
import socket


def chk(data):
    x = sum(x << 8 if i % 2 else x for i, x in enumerate(data)) & 0xFFFFFFFF
    x = (x >> 16) + (x & 0xFFFF)

jayrambhia

#include <errno.h>
#include <fcntl.h>
#include <linux/videodev2.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <opencv2/core/core.hpp>

bombela

#!/usr/bin/env python

import zerorpc.gevent_zmq as zmq

context = zmq.Context()

c = zmq.Socket(context, zmq.XREQ)
c.connect('tcp://127.0.0.1:9998')

print 'running'

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD