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by kkk627
Wed Jan 30, 2019 7:08 am
Forum: Graphics, sound and multimedia
Topic: DMX (Distributed Multi-Head X Server) on pi
Replies: 0
Views: 201

DMX (Distributed Multi-Head X Server) on pi

I'm trying to use DMX on two raspberry pis for my study. I installed DMX using apt-get and executed it in accordance with https://www.raspberrypi.org/forums/viewtopic.php?t=105930. But it crashed with Segmentation fault at address 0x0. My pi is Raspberry Pi 3 Model B+ and the OS is Raspbian stretch....
by kkk627
Mon Jan 28, 2019 6:04 pm
Forum: C/C++
Topic: Decode JPEG stream using MMAL or OpenMax
Replies: 11
Views: 1606

Re: Decode JPEG stream using MMAL or OpenMax

https://github.com/6by9/userland/blob/hello_mmal/host_applications/linux/apps/hello_pi/README to build all the hello_pi apps (although for some reason the IL ones fail to build cleanly at the moment). Full instructions git clone https://github.com/6by9/userland cd userland git checkout -t -b hello_...
by kkk627
Mon Jan 28, 2019 2:55 pm
Forum: C/C++
Topic: Decode JPEG stream using MMAL or OpenMax
Replies: 11
Views: 1606

Re: Decode JPEG stream using MMAL or OpenMax

https://github.com/6by9/userland/blob/hello_mmal/host_applications/linux/apps/hello_pi/hello_mmal_jpeg/jpeg.c It will only decode to YUV, as it is taking the output direct out of the JPEG hardware block and JPEG generally encodes as YUV. (I really must get around to cleaning those up and getting th...
by kkk627
Mon Jan 28, 2019 9:12 am
Forum: 日本語
Topic: OpenMaxまたはMMALによるMotionJPEGのデコード
Replies: 0
Views: 1786

OpenMaxまたはMMALによるMotionJPEGのデコード

現在,Raspberry Pi上でMotion JPEGのデコードを行うプログラムを作成しています. このプログラムでは,外部のサーバから配信されたMotion JPEGをデコードし,得られた各RGBをメモリ上に置いて,それらに対して別途処理を行わせる予定です.(OpenGL ESの利用はしません) 実装にはC++とRaspberry Pi Model B+ (OSはRaspbian stretch) を利用しています. 現在デコードにはlibjpeg-turboを利用していますが,高速化のためにハードウェアデコードをしたいと考えています. ハードウェアデコードをするにはOpenMaxまたはM...
by kkk627
Mon Jan 28, 2019 6:15 am
Forum: C/C++
Topic: Decode JPEG stream using MMAL or OpenMax
Replies: 11
Views: 1606

Decode JPEG stream using MMAL or OpenMax

Hello there. I'm working on making a JPEG stream decoder in C++. This program decodes JPEG images streamed from the server repeatedly. Each decoded RGB images are put on the shared memory. (Not RGBA) And my pi is "Raspberry Pi 3 Mode B+" (Raspbian stretch). Now my program uses libjpeg-turbo in two d...

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