Is it possible to capture all/any audio played by a PC into a system.io.stream, so that it can then be run through speech recognition (System.Speech.Recognition.SpeechRecognitionEngine)?
Essentially I'm looking to pefrom speech recognition on any audio on the client PC, google seems to suggest that capturing a stream like this can be done using Microsoft.DirectX.DirectSound, however I cannot honestly determine how. Any suggestions would be greatly appreciated.
Take a look at this question for a solution on Vista/Win7, and take a look at this one for WinXP.
Summary:
You can use Loopback recording with WASAPI in Vista/Win7, but there is no equivalent API in WinXP, however a partial solution can be achieved with a virtual soundcard driver.
Related
I'm trying to get the video feed from usb camera attached to my Raspberry. Since it's not the dedicated one I can't just use raspivid or the raspicam that comes with uv4l to make changes to config that actually gives some effect at contrary to v4l2-ctl.
When I connect to the WebRTC server through the browser client it actually works at decent framerate. I don't yet understand how that technology works, but before jumping into it I was wondering if someone could tell me if it's possible to somehow (with client made in python or some other opencv magic) get that video feed.
Thanks in advance
I'm still interested if what I've talk about is possible, so if anyone with knowledge stumbles upon this thread, please let me know.
I've kinda solved my issue by using the mjpg-streamer experimental instead, it can be found here:
https://github.com/jacksonliam/mjpg-streamer
Now I'm getting over 8 fps, but it seems much more constant and really seems like I don't need more, compared to uv4l that gave me 3.5 fps with stutters.
I have been stuck on a issue about recording system audio in VB.Net for quite some time now. And I can't find any proper ways to do it. I have been able in the past to make it record the Stereo Mix channel. But as we all know: The quality is absolutely horrible.
I have looked into the Bass.net library, but find it incredibly hard to understand. And the licensing agreement does not fit my usage.
Is there a way to have it record the system audio (Audio played by the computer) properly with optimal audio quality where I can save the recorded audio as a .wav or .mp3?
naudio can do that and is disstributed under the Microsoft Public License (Ms-PL). Don't know if the licenses fits your needs but at least naudio will
This will help you accomplish what you need with no third party libraries required.
http://www.codeproject.com/Articles/770246/How-to-record-any-PC-sound-through-WASAPI-and-Audi
In my project I want to receive/send images to a USB device gadget. For this host side USB driver needs to be written. According to my understanding an image file cannot be directly transferred by reading and storing the bytes one by one till we encounter an EOF(as is done in a normal text file). So how do we do it?
I got a relevant topic on this at the following link:
What is most appropriate USB class to handle images and video transfer and streaming?
but still things were not clear. Should I use libptp with libusb to transfer the image files? i could not get any sample/example code which could explain if its possible or how its done. Thanks for the help in advance!
Regards,
Shweta
Also, from some more investigation, i think LibMTP can be used for image transfer. But to eork for that i guess we need LibUSB aslo installed. Is my understanding correct?
Have a look at this link if you are familiar with python and pygame. Also you can convert image to string and transfer it to other device by pyusb package in python.
I want to embed a video stream into my web page, which is part of our own cloud based software. The video should be low-latency (like video conferencing), and it would be preferable, but not required, for it to include audio. I am comfortable serving streaming binary data from the server-side, and embedding it into the page using HTML5 video.
What I am not comfortable with is the ability to capture the video data to begin with. The client does not already have a solution in place, and is looking to us for assistance. The video would be routed through our server equipment, and not be an embedded peice that connects directly to the video source.
It is a known quantity for us to use a USB or built-in camera from the computer. What I would like more information is about stand-alone cameras.
Some models of cameras have their own API documentation (example). It would seem from what I am reading that a manufacturer would typically have their own API which they repeat on many or all of their models, and that each manufacturer would be different in their API. However, I have only done surface reading and hope to gain more knowledge from someone who has already researched this, or perhaps even had first hand experience.
Do stand-alone cameras generally include an API? (Wouldn't this is a common requirement, so that security software can use multiple lines of cameras?) Or if not an API, how is the data retrieved from the on-board webserver? Is it usually flash based? Perhaps there is a re-useable video stream I could capture from there? Or is the stream formatting usually diverse?
What would I run into when trying to get the server-side to capture that data?
How does latency on a stand-alone device compare with a USB camera solution?
Do you have tips on picking out a stand-alone camera that would be a good fit for streaming through a server?
I am experienced at using JavaScript (both HTML5 and Node.JS), Perl and Java.
Each camera manufacturer has their own take on this from the point of access points; generally you should be able to ask for a snapshot or a MJPEG stream, but it can vary. Take a look at this entry on CodeProject; it tackles two common methodologies. Here's another one targeted at Foscam specifically.
Get a good NAS, I suggest Synology, check out their long list of supported IP Web Cams. You can connect them with a hub or with a router or whatever you wish. It's not a "computer" as-in "tower", but it does many computer jobs, and it can stay on while your computer is off or away, and do thing like like video feeds, torrents, backups, etc.
I'm not an expert on all the features, so I don't know how to get it to broadcast without recording, but even if it does then at least it's separate. Synology is a popular brand and there are lot of authorized and un-authorized plugins for it. Check them out and see if one suits you.
I'm looking into writing an app that runs as a background process and detects when an app (say, Safari) is playing audio. I can use NSWorkspace to get the process ID's of the currently running applications but I'm at a loss when it comes to detecting what those processes are doing. I assume that there is a way to listen in on a process and detect what public messages the objects are sending. I apologize for my ignorance on the subject.
Has anyone attempted anything like this or are aware of any resources that can help?
I don't think that your "answer" is an answer at all...
and there IS an answer (which is not "42")
your best bet for doing this would be to write a pass-through audio output device. Much like soundflower, actually. so your audio output device would then load the actual (physical) audio output device and pass the audio data along to it directly (after first having a look at the audio stream, of course!). then you only need to convince your users to configure your audio device as the default audio output device so that the majority of applications which play sound will use it automatically. and voila...
your audio processing function will probably just do a quick RMS on the buffer before passing it along to the actual output device. and when the audio power crosses a certain threshold (probably something like -54dB with apple audio hardware), then you know that some app is making sound.
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SoundFlower is an open-source project that allows Mac OS X applications to pass audio to each other. It almost certainly does something similar to what you describe.
I've been informed on another thread that while this is possible, it is an extremely advanced technique and not recommended. It would involve using Application Enhancer (APE) and is considered a not 'nice' thing to do. Looks like that app idea is destined for the big recycling bin in the sky :)