I would like to build a program that can catch sound played on Mac OS X, either all sound or from individual programs. Is that possible? I've been reading a lot of documentation but have not found much that looks useful. It could be that I'm just looking in the wrong direction. Can it be done and are there a specific group of APIs that I should focus on?
Haven't tried it, but the idea would be to direct all sound output to an audio "device" (a kernel component) that allows it to be captured. According to this page, you can do that with soundflower.
If you want to do it programmatically, I'd install the soundflower driver and look into controlling it from your program.
Related
I am looking a bit of simple code that will take whatever data comes from the keyboard at a given moment and let me check it for certain button presses. It doesn't matter what language it is in.
I am looking for a console solution, no GUI.
It sounds like you are looking for the curses library (you may also find an implementation as "ncurses", which is probably already installed on your system). This library powers most of the "full-screen" console programs that you might see on Linux.
What is the best way to record the mac screen with cocoa? I know there are many examples at the apple developer reference library. SonOfGrab explain how to capture the screen with quartz but also that it isn't enough fast to use it to grab many frames every second. OpenGLScreenSnapshot has same results but it isn't fast, too. OpenGLScreenCapture seems to be the best way to do it but XCode prompts me many errors because it's made for 10.4 and it requires old Quicktime commands I think they pushed into QTKit but I can't find a way to convert it. Could anyone send me to someone's site that converted the project or tell me if there are some other ways to do it. Thanks in advance.
OpenGL would be the way to go. You should still be able to use the OpenGLScreenCapture sample if your architecture is set to 32-bit. (QuickTime is not available in 64-bit.)
-Ken
We're in process of developing a desktop application which needs to record user's screen once he clicks a button. I read a tutorial about Adobe AIR, which says it is easy to do with AIR: http://www.adobe.com/devnet/air/flex/articles/air_screenrecording.html
But our preference is Titanium as we've explored it a little bit. So I want to know is that even possible? If yes, how can we get started with?
There's also an interesting solution which uses Java applet for recording, as demonstrated here: http://www.screencast-o-matic.com/create?step=info&sid=default&itype=choose
But again, we're not sure about JAVA and would like to know how can it be done? or if its even possible to run a JAVA applet in Titanium?
When you say "record screen", I'm assuming you mean video. Correct?
The only way to do this in Titanium Desktop right now is to take a bunch of screenshots and string them together (encoding would probably need to be done server-side).
Depending on how long your videos need to be, this probably won't work for you. I'm also not confident in how quickly you could capture screenshots, and if it would have a high enough frame rate to be usable.
Past that, a module could be developed for Desktop to support some native APIs to record video. That's not something I see on the horizon, though.
I hope this helps, albiet a rather dismal answer. -Dawson
I'm learning Factor and I thought it would be great to have a small program to capture images from the webcam that comes with my mac pro. I know every webcam will be very different but sounds like something I should be able to do. I want to create a library with support for Mac, Linux and Windows. The problem is that I'm not sure where to start.
Factor-based answers are welcome but I'm looking for the language agnostic solutio. When I google for it, all I get is programs that capture images. I want to learn how to interact (in the 3 big operative systems) with the drivers I guess.
I think the only clue I have is the ioctl wiki page. How would you start such a project? What kind of google keywords would you use? Books?
It's not clear if you want to write a driver for your particular webcam or a library that makes talking to the existing driver easier.
If you want to write a driver for your webcam, you probably want to investigate libusb for Mac and Linux and libusb-win32 for Windows. You would need to understand the protocol that your webcam talks, though. You could probably read the source code for the existing Linux driver (assuming there is one, which is pretty likely).
As for Google search terms, you might try "video capture" and maybe looking for Python/Ruby etc. code or Open Source programs will get you code you can look at to see how to do what you want to do.
Perhaps if you describe in a little more details what you're trying to accomplish someone could give you better suggestions.
I'm building a simple Cocoa app and I want to direct the audio output to a specific device, instead of the system selected one. I know some apps, like Skype, let you select where to send the output to. How do they do this?
I tried the MTCoreAudio framework but I can't even compile my app (or their AudioMonitor demo) with it included and the errors aren't helpful (_objc_fatal). Are there any complete examples that I can learn from? So far my searches haven't turned anything up.
Thanks!
The CAPlayThrough example on the Mac Dev Center Sample Code library shows how to list all of the available input and output devices, and select a default device from a menu.
Have you looked through the sample code on http://developer.apple.com ?
Look at these projects http://developer.apple.com/mac/library/navigation/index.html?section=Resource+Types&topic=Sample+Code
Namely the DefaultAudioUnit project.
I should say that working with Core Audio is more challenging than Cocoa. Most of the API's are C-based (I find that harder). You should read the Core Audio programming guide as well to get a sense of how the audio system is put together.