H.264 NAL reference

 http://www.hellotongtong.com/avcodecbase/avcodecbase-h264-learning100.html

1. forbidden_zero_bit
1. bit，H264 规定此位必须为 0
2. nal_ref_idc
1. 用于表示当前 NALU 的重要性，值越大，越重要
2. 解码器在解码处理不过来的时候，可以丢掉重要性为 0 的 NALU

3. nal_ref_idc 不等于 0 时, NAL unit 的内容可能是 SPS/PPS/参考帧 的片

   nal_ref_idc 等于 0 时，NAL unit 的内容可能是非参考图像的片

   当某个图像的片的 nal_ref_id 等于 0 时，该图像的所有片均应等于 0

3. 
   

ffprobe h264

 ffprobe -show_frames 1.h264 |grep pict_type

jack@i7-build-server:~$ ffprobe -show_streams 1.h264

CPython

 Cross-compile Python for use on armv7l

Cross compiling python for aarch64

#!/bin/bashset -x -eexport HOST_ARCH=aarch64-linux-gnuexport TOOL_PREFIX=/home/username/aarch64-linux-toolchain/bin/$HOST_ARCH
export CXX=$TOOL_PREFIX-g++export CPP="$TOOL_PREFIX-g++ -E"export AR=$TOOL_PREFIX-arexport RANLIB=$TOOL_PREFIX-ranlibexport CC=$TOOL_PREFIX-gccexport LD=$TOOL_PREFIX-ldexport READELF=$TOOL_PREFIX-readelfexport LDLAST="-lgcov"./configure --host=$HOST_ARCH --target=$HOST_ARCH --build=x86_64-pc-linux-gnu --prefix=$HOME/temp --disable-ipv6 ac_cv_file__dev_ptmx=no ac_cv_file__dev_ptc=no ac_cv_have_long_long_format=yes --enable-shared  --with-zlib-dir=/usr/lib64 --with-ensurepip=yes --enable-optimizationmake BLDSHARED="$TOOL_PREFIX-gcc -shared" CROSS-COMPILE=$TOOL_PREFIX- CROSS_COMPILE_TARGET=yessudo make install BLDSHARED="$TOOL_PREFIX-gcc -shared" CROSS-COMPILE=$TOOL_PREFIX- CROSS_COMPILE_TARGET=yes prefix=$HOME/Python-$HOST_ARCH/_install

GStreamer

 

GStreamer 架構

https://blog.toolman.xyz/article/259

bitmap font

 

1.https://github.com/dhepper/font8x8

2. https://opengameart.org/art-search?keys=bitmap

3. https://opengameart.org/content/8x8-ascii-bitmap-font-with-c-source

/************************************************************************

* font.c

* Copyright (C) Lisa Milne 2014 <lisa@ltmnet.com>

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful, but

* WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

* See the GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program.  If not, see <http://www.gnu.org/licenses/>

************************************************************************/

/* the values in this array are a 8x8 bitmap font for ascii characters */

static uint64_t font[128] = {

0x7E7E7E7E7E7E0000, /* NUL */

0x7E7E7E7E7E7E0000, /* SOH */

0x7E7E7E7E7E7E0000, /* STX */

0x7E7E7E7E7E7E0000, /* ETX */

0x7E7E7E7E7E7E0000, /* EOT */

0x7E7E7E7E7E7E0000, /* ENQ */

0x7E7E7E7E7E7E0000, /* ACK */

0x7E7E7E7E7E7E0000, /* BEL */

0x7E7E7E7E7E7E0000, /* BS */

0x0, /* TAB */

0x7E7E7E7E7E7E0000, /* LF */

0x7E7E7E7E7E7E0000, /* VT */

0x7E7E7E7E7E7E0000, /* FF */

0x7E7E7E7E7E7E0000, /* CR */

0x7E7E7E7E7E7E0000, /* SO */

0x7E7E7E7E7E7E0000, /* SI */

0x7E7E7E7E7E7E0000, /* DLE */

0x7E7E7E7E7E7E0000, /* DC1 */

0x7E7E7E7E7E7E0000, /* DC2 */

0x7E7E7E7E7E7E0000, /* DC3 */

0x7E7E7E7E7E7E0000, /* DC4 */

0x7E7E7E7E7E7E0000, /* NAK */

0x7E7E7E7E7E7E0000, /* SYN */

0x7E7E7E7E7E7E0000, /* ETB */

0x7E7E7E7E7E7E0000, /* CAN */

0x7E7E7E7E7E7E0000, /* EM */

0x7E7E7E7E7E7E0000, /* SUB */

0x7E7E7E7E7E7E0000, /* ESC */

0x7E7E7E7E7E7E0000, /* FS */

0x7E7E7E7E7E7E0000, /* GS */

0x7E7E7E7E7E7E0000, /* RS */

0x7E7E7E7E7E7E0000, /* US */

0x0, /* (space) */

0x808080800080000, /* ! */

0x2828000000000000, /* " */

0x287C287C280000, /* # */

0x81E281C0A3C0800, /* $ */

0x6094681629060000, /* % */

0x1C20201926190000, /* & */

0x808000000000000, /* ' */

0x810202010080000, /* ( */

0x1008040408100000, /* ) */

0x2A1C3E1C2A000000, /* * */

0x8083E08080000, /* + */

0x81000, /* , */

0x3C00000000, /* - */

0x80000, /* . */

0x204081020400000, /* / */

0x1824424224180000, /* 0 */

0x8180808081C0000, /* 1 */

0x3C420418207E0000, /* 2 */

0x3C420418423C0000, /* 3 */

0x81828487C080000, /* 4 */

0x7E407C02423C0000, /* 5 */

0x3C407C42423C0000, /* 6 */

0x7E04081020400000, /* 7 */

0x3C423C42423C0000, /* 8 */

0x3C42423E023C0000, /* 9 */

0x80000080000, /* : */

0x80000081000, /* ; */

0x6186018060000, /* < */

0x7E007E000000, /* = */

0x60180618600000, /* > */

0x3844041800100000, /* ? */

0x3C449C945C201C, /* @ */

0x1818243C42420000, /* A */

0x7844784444780000, /* B */

0x3844808044380000, /* C */

0x7844444444780000, /* D */

0x7C407840407C0000, /* E */

0x7C40784040400000, /* F */

0x3844809C44380000, /* G */

0x42427E4242420000, /* H */

0x3E080808083E0000, /* I */

0x1C04040444380000, /* J */

0x4448507048440000, /* K */

0x40404040407E0000, /* L */

0x4163554941410000, /* M */

0x4262524A46420000, /* N */

0x1C222222221C0000, /* O */

0x7844784040400000, /* P */

0x1C222222221C0200, /* Q */

0x7844785048440000, /* R */

0x1C22100C221C0000, /* S */

0x7F08080808080000, /* T */

0x42424242423C0000, /* U */

0x8142422424180000, /* V */

0x4141495563410000, /* W */

0x4224181824420000, /* X */

0x4122140808080000, /* Y */

0x7E040810207E0000, /* Z */

0x3820202020380000, /* [ */

0x4020100804020000, /* \ */

0x3808080808380000, /* ] */

0x1028000000000000, /* ^ */

0x7E0000, /* _ */

0x1008000000000000, /* ` */

0x3C023E463A0000, /* a */

0x40407C42625C0000, /* b */

0x1C20201C0000, /* c */

0x2023E42463A0000, /* d */

0x3C427E403C0000, /* e */

0x18103810100000, /* f */

0x344C44340438, /* g */

0x2020382424240000, /* h */

0x800080808080000, /* i */

0x800180808080870, /* j */

0x20202428302C0000, /* k */

0x1010101010180000, /* l */

0x665A42420000, /* m */

0x2E3222220000, /* n */

0x3C42423C0000, /* o */

0x5C62427C4040, /* p */

0x3A46423E0202, /* q */

0x2C3220200000, /* r */

0x1C201804380000, /* s */

0x103C1010180000, /* t */

0x2222261A0000, /* u */

0x424224180000, /* v */

0x81815A660000, /* w */

0x422418660000, /* x */

0x422214081060, /* y */

0x3C08103C0000, /* z */

0x1C103030101C0000, /* { */

0x808080808080800, /* | */

0x38080C0C08380000, /* } */

0x324C000000, /* ~ */

0x7E7E7E7E7E7E0000 /* DEL */

};

Silicon lab matter& low power wifi RS9116

 

RS9116 

Standby Associated, DTIM = 10 / 51uA Wi-Fi (1 second beacon listen interval).

SLEEP_IND_FROM_DEV output pin > to wake up MCU.

ULP_WAKEUP input pin. > MCU to wake up  RS9116 

1.      RS9116 auto joining Wifi AP router after power on > Yes.

Our RS9116 use AT command , MCU can give us SSID and passwords to joining the AP router when power on.    

CONFIG_CFG80211_CERTIFICATION_ONUS

 https://wireless.wiki.kernel.org/en/developers/regulatory

VSWR Conversion Table antenna

 https://www.everythingrf.com/tech-resources/vswr

SONY CMOS 感度資訊

 https://www.sony-semicon.com/en/products/is/security/security.html

chardev gpio

 https://embeddedbits.org/new-linux-kernel-gpio-user-space-interface/#:~:text=Linux%20kernel%20GPIO%20interface,via%20a%20producer%2Fconsumer%20model

Kinesis

Reference data:

1. https://aws.amazon.com/tw/kinesis/video-streams/resources/?nc=sn&loc=4&amazon-kinesis-video-streams-resources-blog.sort-by=item.additionalFields.createdDate&amazon-kinesis-video-streams-resources-blog.sort-order=desc
2. https://docs.aws.amazon.com/kinesisvideostreams/latest/dg/kinesisvideo-dg.pdf
3.  https://github.com/awslabs/amazon-kinesis-video-streams-producer-sdk-cpp
4. https://docs.aws.amazon.com/kinesisvideostreams-webrtc-dg/latest/devguide/kvswebrtc-sdk-c.html
5. https://docs.aws.amazon.com/iot/latest/developerguide/iot-embedded-c-sdk.html
6. https://news.panasonic.com/jp/press/jn220124-1
7. https://docs.aws.amazon.com/kinesis/index.html

rtl8723bu rtl8723du在mstar平臺上移植 BT

rtl8723bu rtl8723du在mstar平臺上移植

BT 

 https://www.twblogs.net/a/5edccc668ecbc10c342cf27b

SRS+ metaRTC

 

https://ossrs.net/lts/zh-cn/docs/v4/doc/introduction

https://ossrs.net/lts/zh-cn/docs/v4/doc/introduction

Major source:

1. SRS(Simple Realtime Server) Doc
2. metartc/metaRTC  (纯C的webrtc版IPC)

Information:

1. metaRTC5.0实现君正/瑞芯微/MSTAR/海思等芯片的纯C的webrtc版IPC 
1. (RK1126 prebuild so, )
2. metaipc_rk1109/metaipc5_jz为瑞芯微和君正代码demo
2. SRS不再维护srs-librtmp，原因请看#32。
3. 
   

Example:

1. srs部署/webrtc拉流
2. 用yangwebrtc搭建虚拟背景和美颜webrtc直播系统_metaRTC的博客-程序员ITS404
3. 
   

CFRS

 / 

<input type="hidden" name="csrf" value"djaskl;fhasdkjkfhasd"/>

lighttpd.conf.template

setenv.add-response-header += ("set-Cookie" => "X-XSRF-TOKEN=sdfasdfasdf; SameSite=Strict; Secure; HttpOnly; Path=/")

CSRF web test

 https://edricteo.com/how-to-test-for-csrf/

https://security.love/CSRF-PoC-Genorator/

YOLOv4-tyny 42fps

 

https://edgenoon-ai.github.io/edge-devices/jetson-tx2-yolo-v3-v4-benchmark/

YOLOv3-tyny-prn	416	3.5	33.1%	57.0
YOLOv4-tyny	416	6.9	40.2%	42.0

AWS Embedded FOTA/Shadow

 

AWS IoT Over-the-air Update  v3.0.0

https://aws.github.io/aws-iot-device-sdk-embedded-C/202103.00/libraries/aws/ota-for-aws-iot-embedded-sdk/docs/doxygen/output/html/index.html#ota_memory_requirements

AWS IoT Device Shadow   v1.1.1

https://aws.github.io/aws-iot-device-sdk-embedded-C/202108.00/libraries/aws/device-shadow-for-aws-iot-embedded-sdk/docs/doxygen/output/html/shadow_design.html

 Embedded C 的 AWS IoT 裝置 SDK

https://docs.aws.amazon.com/zh_tw/iot/latest/developerguide/iot-sdks.html

Git to make release note

 #Git to make release note

1. git log --pretty=oneline --no-merges > rel.txt

2. cat rel.txt | awk '{"git describe --always $1" |& getline $1} {print}'

3. cat rel.txt | awk '{system("git describe --always "$1)} {print $0}'

pe42423 nrf52833 AOA AOD

 pe42423

https://devzone.nordicsemi.com/f/nordic-q-a/85732/antenna-switching-for-bluetooth-direction-finding

nwp_036.pdf

https://www.mouser.tw/datasheet/2/297/nRF52833_SoC_Product_Brief-1815256.pdf

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fstruct_nrf52%2Fstruct%2Fnrf52833.html

How to install pytorch in tx2

 

 nvcc --version

nvcc: NVIDIA (R) Cuda compiler driver

Copyright (c) 2005-2021 NVIDIA Corporation

Built on Sun_Feb_28_22:34:44_PST_2021

Cuda compilation tools, release 10.2, V10.2.300

Build cuda_10.2_r440.TC440_70.29663091_0

cuda_10.2

python3.6

PyTorch for Jetson - version 1.10 now available

• PyTorch v1.7 - torchvision v0.8.1

Install jetson pytorch: 

https://forums.developer.nvidia.com/t/pytorch-for-jetson-version-1-10-now-available/72048

--------------------------

pytorch

wget https://nvidia.box.com/shared/static/p57jwntv436lfrd78inwl7iml6p13fzh.whl -O torch-1.10.0-cp36-cp36m-linux_aarch64.whl sudo apt-get install python3-pip libopenblas-base libopenmpi-dev pip3 install Cython  pip3 install torch-1.7.0-cp36-cp36m-linux_aarch64.whl

---------------------

$sudo apt-get install libjpeg-dev zlib1g-dev libpython3-dev libavcodec-dev libavformat-dev libswscale-dev$

$git clone --branch v0.12.0 https://github.com/pytorch/vision torchvision # see below for version of torchvision to download

$ cd torchvision $ export BUILD_VERSION=0.8.1 # where 0.x.0 is the torchvision version $ python3 setup.py install --user

$ cd ../ # attempting to load torchvision from build dir will result in import error

$pip install 'pillow<7' # always needed for Python 2.7, not needed torchvision v0.5.0+ with Python 3.6

------------------

sudo apt-cache show nvidia-jetpack
It will show something like:

Package: nvidia-jetpack
Version: 4.4-b144
Architecture: arm64
Maintainer: NVIDIA Corporation

-------------------------------------

cuda version

$ cat /usr/local/cuda/version.txt

CUDA Version 10.2.300

-----------------------------------------

查看cudnn版本

ls /usr/local/cuda*
cat /usr/local/cuda/include/cudnn.h | grep CUDNN_MAJOR -A 2-------------------------------------workable pytorch in TX2 w/ python3.6 CUDA 10.2, jetpack 4.4https://developer.nvidia.com/embedded/downloads
 torch-1.11.0a0+17540c5+nv22.01-cp36-cp36m-linux_aarch64.whl
----------------------------------

 pip3 install --no-deps torchvision
Collecting torchvision
  Using cached https://files.pythonhosted.org/packages/fb/01/03fd7e503c16b3dc262483e5555ad40974ab5da8b9879e164b56c1f4ef6f/torchvision-0.2.2.post3-py2.py3-none-any.whl
Installing collected packages: torchvision
Successfully installed torchvision-0.2.2.post3

CA intermediate ssl certificate

 https://www.thesslstore.com/blog/root-certificates-intermediate/

https://aboutssl.org/install-ssl-certificate-on-lighttpd-server/

斐波那契數列 Dynamic Programming

 

斐波那契數列 

Dynamic Programming

https://ithelp.ithome.com.tw/articles/10271832

Mutual Information Python

 

https://www.codeleading.com/article/31721058116/

1. from sklearn import metrics as mr
2. from scipy.misc import imread
3. import numpy as np
5. img1 = imread('1.jpg')
6. img2 = imread('2.jpg')
8. img2 = np.resize(img2, (img1.shape[0], img1.shape[1], img1.shape[2]))
10. img1 = np.reshape(img1, -1)
11. img2 = np.reshape(img2, -1)
12. print(img2.shape)
13. print(img1.shape)
14. mutual_infor = mr.mutual_info_score(img1, img2)
16. print(mutual_infor)

Python metrics.mutual_info_score方法代碼示例

https://vimsky.com/zh-tw/examples/detail/python-method-sklearn.metrics.mutual_info_score.html

linux c function

 https://dylan237.github.io/linux-basic.html

alias rm

  alias rm='DIR=/tmp/trash/rm`date +%F%T`;mkdir $DIR;mv -t $DIR'

nRF52840

 https://www.nordicsemi.com/Products/nRF52840

Win11 螢幕蓋上 省電

 powercfg -h off