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# 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 |
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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]]) |
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""" | |
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() |
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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) |
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#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> |
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#!/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' |
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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 |