I am trying to build a program in Java, which would be able to output sound to different output lines on my sound card.
How is it possible to do in Java?
I'm not sure what background you have in working with sound (it might be bigger than mine) but what I think you have is a number of lines that you want to direct to a number of ports? http://download.oracle.com/javase/7/docs/api/javax/sound/sampled/package-summary.html - This might be an API for this, which I don't know much about (I've seen a program using something like that with VoIP).
By the way if yr working on Windows, I believe that some information about your soundcard is stored in the registry, and you might have to update the registry from the program to gain access to it (not sure).
I hope I helped somehow :)
Check out the Java sound programmer's guide.
To get this to work I had to reconfigure my sound card to expose its ports as separate "outs"; otherwise the sound card would route the sound automatically depending on whether a pair of headphones were plugged in. (On Windows.)
You can use Jack (Jack Audio Connection Kit) to route sound to your soundcard. It is a little complicated, it doesn't work with pulseaudio, but you can make it work.
JnaJack provides an interface from Java to the Jack API via JNA. It's really quite easy.
I wrote it up in more detail here.
Related
I am building an online web application which offers clients to test their language skills.
The application consists of series of different test the clients can freely do. One of these tests is one where the client sees a sentence on the web-page and then is required to speak the sentence to a microphone. The idea would be to record the audio stream, send it to server and save it there to a file.
Is this possible using PHP, Java, or something similar to them?
Thank you for any help :)
I know you asked for PHP, I'm guessing that's your language of choice, but have you considered using html5 to record your audio? Note: browser support is still lacking but it might be worth looking into depending on your requirements.
Check out this tutorial; it uses the GETUSERMEDIA API to access you camera and microphone hardware.
Update: Here is another good tutorial on the subject.
The only realistic solutions for solving the problem are with flash, as suggested by another answer, or a java applet. In a year or two that will hopefully change and you'll be able to use javascript and HTML5, but this is now.
I would say this is a problem better and more easily solved with flash, but for java, You need to write a java applet to do the recording. Here are some hints to get you started:
http://docs.oracle.com/javase/tutorial/deployment/applet/
http://www.java2s.com/Tutorial/Java/0120__Development/CapturingAudiowithJavaSoundAPI.htm
http://www.jsresources.org/
You do not need java speech API or JMF, just java sound. You might WANT JMF to compress the audio file to make uploading go faster, but you can get this working without. Note that you may need to "sign" your applet in order to record audio in a browser.
If you are averse to flash, you could also use haxe to write your flash code.
Not 100% what you're looking for but I think it'll at least give you some ideas.
How to record streaming audio to the server
It is possible to solve this problem using Flash and Java both. You can use Flash component to record sound and send it in chunks to server side which can be implemented using java.
Pros to create sound recorder in Flash are many.
Flash is widely installed plugin in Browser
Java Applet gives warning before running it which many times turns off users.
Numerically checked, most media applications are created using Flash thereby providing you nice support.
Java Applets are used where thick client has to fit into browser and must also be secure. You will still find many real time treading applications are written in java applets.
Here are couple of tutorials to create Sound Recorder in Flash
http://active.tutsplus.com/tutorials/actionscript/create-a-useful-audio-recorder-app-in-actionscript-3/
Adobe record sound and save
This collected stream of sound can be stored in chunks on client side and can be synced with backend server(any server side language shall be fine.).
Implementing your server in Java has advantage. If tomorrow need arises, you can stream the same sound using Red5 server which is implemented in Java.
See more here: http://www.red5.org/
There is an audio recording SDK for this which is written in PHP, Flash and HTML5. http://recordmp3online.com
I am actually the author of that SDK (full disclosure)
I want to use a program written in a high level language like Java or Python to talk to a GSM Modem.
I want to be able to tell the modem what number to call and when to call it. I also want to be able to read and send text messages.
I do NOT need to handle voice transmission in either direction of the call.
I'd appreciate recommendations of any applicable libraries and specific modems that are good to start with? I like Java but am willing to try something else.
Thanks
There are a set of relatively standard "AT" commands that can be used for these types of operations - including placing phone calls and sending text messages. Some details around this are at http://www.smssolutions.net/tutorials/gsm/sendsmsat/ and http://www.dreamfabric.com/sms/ (simply first results of a little online searching).
A little more online searching yielded a Java-specific example at http://www.java-samples.com/showtutorial.php?tutorialid=22 .
I had done a little bit of this in Java a number of years back, using the Java Communications API - available at http://www.oracle.com/technetwork/java/index-jsp-141752.html . (My purpose was for interfacing with the phone book on my phone, but this also should have worked with interfacing with the SMS system.)
Almost all modems and (phones which support tethering to your PC) can do this. All modems are equally good at it.There are no starter's modems. Just go through the AT commands specific to your applications and thats it.
I'm trying to make a program which allows me to capture every sound which I can hear through my speakers. I don't have any idea how I can do this... I want to send it to another PC using sockets (how can I do this?). I want to write it in Java or C++ (I definitely prefer Java) on Windows.
Edit
Inshort, I want to send & receive Audio input using Java
Please help,
Chris
For Windows 7 you can do this using WASAPI (see my answer to a similar question here). In order to use WASAPI I would recommend to use either C++ or some .net based language (C#, vb.net, etc)
For other versions of Windows, you will need an intermediate virtual sound card, and you will only be able to capure the audio streams that go through this virtual driver. There is a commercial option here,but I am sure there are others.
One more link here
I would have thought that this would be an easy thing to do, but no amount of googling around has turned up any solutions.
I have written an application for a client that runs in full screen and allows the user to page through educational books in order to help teach kids to read. So far so good. Some phrases from the displayed materials are read back to the user and, again, so far so good. Normally, these sounds are read at the system volume. (ie, at whatever volume any other system sound would be played.)
The client, however, now wants the user to be able to adjust the volume in program. I have the UI and processing end of that working, but I'm having a hard time adjusting the volume of the clips being played in a meaningful way. Right now I have a funky setup that involves reading the original gain of the clip and then adjusting that up or down for each clip. While this does adjust the volume, it does not seem to do it relative to the system volume -- all of the sounds are much quieter than the system volume.
So, my question really is: how do you suggest controlling sound volume within a program? All of my research has turned up nothing meaningful, which implies to me that it's kind of hard or even impossible, but that just doesn't seem right.
Oh, details: I'm reading in WAVs as AudioInputStreams and playing them as java.sound.sampled.Clip. I'm controlling the gain using FloatControl.Type.MASTER_GAIN. (FloatControl.Type.VOLUME is not supported.) I'm stuck using Java 1.4.
You might also look to see if there is an older version of the Java Media Framework (JMF) that will support Java 1.4... it might provide you with a more rich environment for working with audio.
Other than that, you say you are stuck in 1.4... you might see if there is any way you can get upgraded to Java 5 or 6, though you may want to test either of these first on your local machine to see if they actually help any.
I guess one last suggestion is to find some Java game development sites and post your question there; I would think they would have figured out ways around it... though you could also get a lot of 'upgrade your jvm' responses there too. :-)
Good luck.
This is an OS-specific thing to do, and you'll have to use either JNI or J/Invoke or JNIWrapper or jna or...
I am trying to make an application in which one component captures the screen of the user (for screen casting). I am aware that there are two options to achieve the same using a Java applet (please correct me if I am wrong). First is to use the java applet to take screen shots continuously and convert it into a video and upload it as a video file. And second is to create a java vnc server and record it as a .fbs file and play it using a player like: http://www.wizhelp.com/flashlight-vnc/index.html
I would like to know the best solution in terms of video quality, file size, cross-platform compatibility (windows and mac), firewall problems and finally ease of implementation.
I am very new to Java. Please tell me whats the best solution for my problem. Also, is it easy enough for me to program it on my own or should I get it developed via a freelancer. I have tons of programming experience (5+ years in LAMP) but none in Java.
Thank you very much.
I agree that this is pretty hard. I implemented those two solutions (VNC and onboard screen capture) plus a third (capture from an external VGA source via an Epiphan grabber) for a former employer. I had the best bandwidth-to-quality ratio with VNC, but I got higher framerate with VGA capture. In all three cases, I reduced the frames + capture times to PNGs and sequenced them in a QuickTime reference movie. Then I made flattened video (MPEG4 or SWF) of the results. In my case, I then synchronized the screen video with a DV stream.
In the end the technology worked (see a sample of the output) but our business model failed.
From what I know, the older versions of applet had security restrictions that may not allow for screen capture. Instead, a java application may be feasible.
Regarding the build-it-yourself vs the fire-a-coder, it depends on how you value your time compared to what you can find on a freelancer site.
I think you can find someone from India/Romania/Poland/Other countries that can make it for an affordable price
Given your Java knowledge and the difficulty of the task, have you considered taking an alternative approach? For example, how about a native VNC server for the end-user, which is just a small download and then they click "Run." And that native server is programmed to capture the screen and send it straight to your web server, which has a client like vnc2swf or other means of converting the VNC stream to a video or .fbs file? Does all that make sense?
Admittedly, without Java, you have to prepare one executable program per platform you want to support, however, I don't know. That still sounds easier to me. Consider Copilot.com. They are doing VNC but they still use small native apps for each platform.
Sorry but this seems the kind of job that requires a lot of experience. Even if you find code snippets all around the net to fix this and that, the overall result may be way worse than simply hiring an experienced Java programmer.