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Nov 13th, 2005, 7:40 AM
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#1 |
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Highly Adaptive Penguin
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using mic and speakers in C++
im using a windows xp, and a watcom compiler. I want to create a voice chat, and was wondering how i could implement the use of a microphone and speakers in my program.
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Nov 13th, 2005, 11:48 AM
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#2 |
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You might look into the windows audio apis.
http://www.borg.com/~jglatt/tech/lowaud.htm and into winsock. http://www.frostbytes.com/~jimf/pape...s/winsock.html are some sample sites. Record data from an audio input [set up a buffer with the audio apis] and send it through a socket to a server. The server would send it out to other people where their client take the data and sends it to the speaker buffer to be played. You will have to decide how you want to mix the sound if more then one person talks at the same time. I dont know how much help you wanted so I just gave you some links to point you in the right direction and to give you a basis to do your own research. |
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Nov 13th, 2005, 11:50 AM
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#3 |
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SEXY SHOELESS GOD OF WAR!
 
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This is a complex issue. While there are APIs for recording and playing back sound (look up MCI and/or DirectSound), you'll need more than just that. You'll want some method of compressing and decompressing the data, and you'll need to do this yourself unless you know how to make use of existing codecs (and probably a third-party library, as well).
How complex it gets depends on your needs. When using a lower-bandwidth connection, you'll want higher compression, but if you have a broadband connection, you might be able to skip compression entirely if you keep the sampling rate low enough. Do you want to be able to play multiple sounds at once, like if you're talking to two or more other people, and they both talk at the same time? How are you going to handle cases when sound is coming in while you want to talk, without causing feedback?
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Nov 13th, 2005, 1:32 PM
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#4 |
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Highly Adaptive Penguin
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how do i compress the data
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Nov 13th, 2005, 2:14 PM
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#5 |
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Professional Programmer
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By using an audio codec.
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% rc4 hexkey < input > output
#define S ,t=s[i],s[i]=s[j],s[j]=t /* rc4 hexkey <file */
unsigned char k[256],s[256],i,j,t;main(c,v,e)char**v;{++v;while(++i)s[
i]=i;for(c=0;*(*v)++;k[c++]=e)sscanf((*v)++-1,"%2x",&e);while(j+=s[i]
+k[i%c]S,++i);for(j=0;c=~getchar();putchar(~c^s[t+=s[i]]))j+=s[++i]S;} |
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Nov 13th, 2005, 2:53 PM
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#6 | |
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SEXY SHOELESS GOD OF WAR!
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Quote:
You could also write your own custom compression algorithm. There's lots of info on this sort of thing on the net, but it's not exactly a trivial task. Also, remember that the people who write compression algorithms for a living are going to be much better at it than you or I, so unless you're looking for the experience, I'd recommend against this route.
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Nov 13th, 2005, 3:23 PM
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#7 |
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Highly Adaptive Penguin
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ok thanks
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