Raspberry Pi Forums

Yam

Thank you this is what I was looking for i'll have a play and see if I can get it working for my needs.

Yam

Hello, I am trying to setup a very particular network for 2 raspberry pi's One 'main' pi with WiFi connected to a second pi via a crossover cable (using the ethernet port on each pi). With NO switch just directly connected. I can not get the main pi when connected via the crossover cable to use the ...

Yam

Hello I am still desperately trying to create a stereo camera using 2 raspberry pis (yes i know there is a new board that can run 2 cameras but I've decided to complete this project as an exercise). I am so very close to getting a working program but I am unable to get the camera to behave without u...

Yam

So I have found a lot more looking into OpenMAX finding also that nearly all of it also applies to MMAL. I am getting to the point where I will be able to write my own programs. I can see why people avoid OpenMAX it is the pain everyone promised :). But things are slowly making sense and I have fewe...

Yam

I don't know if this is what your looking for but I found this on my travels
https://github.com/raspberrypi/hats

Yam

Well after weeks of just stumbling around in the dark I have learnt a lot but I am still unable to get the most basic of examples working in MMAL. With so little documentation I've decided to try a stab at learning OpenMax. Thanks to jamesh who pointed me in the right direction in terms pthreads I r...

Yam

so i can compile the examples in the mmal test folder but still haveing problems. the connections example is the most usefull to me but the reader component fails at runtime when trying to set uri. it gives the error mmal: reader_container_open: error opening file filename (1) failed to set uri of c...

Yam

Ok buried in the userland code I have found what I was looking for.
going to try and compile it.

Is it just me? does anyone else struggle with this I feel I have bitten off more than I can chew tackling this library at this stage of my learning.

Yam

having learnt about pthreads semaphores and all the other gaps in my knowledge I am still struggling with MMAL (although I understand more of it).

In particular I am trying to make a compilable version of their example code.
Has anyone done this?

Yam

So I've finally gotten around to learning pthreads Its spinning my head a bit but slowly working my way through it. Threading works pretty much as I expected although more work is done by the programmer than I imagined. Still not the reached the point where I can implement my own blocking code. I th...

Yam

So I am getting further each day and now have my own working example displaying a preview thanks mainly to the raspicam programs and the example i posted before (which works great but does not terminate). I understand many of the concepts I was struggling with before but now I am looking for documen...

Yam

I have of course googled semaphores and read what I could understand. From the little i do understand it basically is some kind of event signal to tell you when a thread has finished. But standard programming technique? its odd how all the references I find in google are under advanced techniques. I...

Yam

thanks for the replies I am slowly getting to grips with this although the concept of a semaphore still eludes me and acording to the docs im supposed to have one to deal with buffers? anyway in the example on http://www.jvcref.com/files/PI/documentation/html/ is there a typo on the example code the...

Yam

Still struggling but have found a piece of example code that is far easier to read than the examples given in userland

https://github.com/tasanakorn/rpi-mmal- ... lop/main.c

note: do not compile currently investigating problem

Yam

Yup legal C code is legal C++ code (except some very rare exceptions)
you don't need to learn anything new just write in C and compile with a C++ compiler.

Probably wise to make a note of it in a comment if its a public project.

Yam

Ok what i'm trying to do is create a stereo camera from 2 raspberry pi's connected via ethernet and 2 camera modules. I have found issue with the way the default behavior for the preview works. Idealy I would like 2 low res previews on the same screen (which wont necessarily be on fb0 because I woul...

Yam

Is there not 1 book on any of these subjects?

Yam

Does anyone know of any good articles or books what I really need is a more experienced programmer to point me in the right direction.

Yam

I have read all of this it does not explain the core concepts i.e what a buffer is and what it does

Yam

I have recently learnt to program in C and am struggling to understand MMAL I have worked through C a modern approach completely and can follow code. I feel that I am not familiar with a lot of the concepts used like ports streams and buffers. Can anyone recommend some good reading for these concepts?

Yam

the way open GL works any new function not in the hardware would have to be emulated by the processor. As good as the raspberry pi is this would result in performance not worth the effort of writing the emulation. March of progress I'm afraid but I imagine there will be a raspberry pi 2 at some poin...

Yam

This project has been on pause recently (moving, life etc). But I am due to start working on it again next week. I need a vote. The graphics are 2d and will have to remain so for the forseable future but there are 2 ways of doing the graphics 1. Pre rendered 3d sprites in blender. 2. 2d hand drawn a...

Yam

I'm pretty sure my comments are quite ignorant as I don't know how to write a sound driver but. Surely a buffer in the ram is the best solution for audio it might raise latency but anything is better than the current solution (making the buffer 0 when nothing is needed to be played but still outputt...

Yam

Just ordered the development kit may make more sense to try and power this with 3 raspberry pis 1 for computation and 1 for rendering the screen for each eye, optimising the memory divides you could get some fairly impressive worlds. You will be able to get something to the oculus with 1 raspberry I...

Yam

Out of interest have you tried both modes in bsnes? "Accuracy uses a pixel-based renderer, which is required to properly emulates effects such as the plane shadow from Air Strike Patrol. However, it is almost twice as slow as the compatibility profile. Compatibility uses a scanline-based render...

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