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Audio input from both GoCam/Talkman or Socom Microphones

 
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mypspdev



Joined: 11 Jul 2007
Posts: 178
PostPosted: Thu Nov 01, 2007 12:26 am    Post subject: Audio input from both GoCam/Talkman or Socom Microphones Reply with quote
Hi to all!
Thanks in advance for your help, specially to funs of Audio Mechanica (Art's!) homebrew and audio input/output control.

I'm developing an application sending and receiving audio between two PSP using adhoc client-server connection and then video&audio streaming using GoCam.

Actually good results:
- audio input from Socom microphone is quicky transferred from one PSP to another at 5112 hz (telephony quality)
- video input from GoCam is quicky viewed on the other PSP using 160x120 frame size

Now I'd like to trasfer audio input from GoCam microphone.

My problem is the following:
Using Gocam this the instruction to capture audio buffers:

Code:
result = sceUsbCamReadMicBlocking(audiobuffer, sizeof(audiobuffer));


where:
u8 audiobuffer;


using Socom microphone the following variable is for capturing audio :

Code:

unsigned short audiobuffer[buffersize];


Well, finally, outputting buffer from Socom all sounds are clear and true:

Code:

ubuf[i].l = audiobuffer[i];
ubuf[i].r = audiobuffer[i];


But how can I output sounds as "short" from the incoming GoCam buffer Microphone as well as it is u8 type and not short?

Thanks, may be it is a stupid conversion, I'm sorry for my poor knowledge.
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Art



Joined: 09 Nov 2005
Posts: 647
PostPosted: Thu Nov 01, 2007 12:57 am    Post subject: Reply with quote
Well good work on what you've achieved so far.
I don't think that's been done yet. Always great to see a first.

The short data type is a 16 bit signed two's complement integer.
(lifted that definition off the net actually!)
Minimum value is -32768 and a maximum of 32767.
u8 is a plain old byte. 8 bits unsigned 0 to 255 (only 256 possible values).

You'll be able to copy the value of a byte to a short, but not the other way round.

If you're only learning, and it helps, you can make a new short
"anotherbuffer"
and copy either a u8 or short value to it, and then at the recieving end
you can copy the value from that back to a u8 or short variable type.
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mypspdev



Joined: 11 Jul 2007
Posts: 178
PostPosted: Thu Nov 01, 2007 1:26 am    Post subject: Reply with quote
Art wrote:
Well good work on what you've achieved so far.
I don't think that's been done yet. Always great to see a first.

yes! it's very good to see it works almost fine: two approches I've tested: continous 4096 sound buffer sending or "talk command" then "stop talk command" and send full buffer.
Both are well. Some problems I'm still having when both PSP are talking and sending (duplex mode...).
Quote:

The short data type is a 16 bit signed two's complement integer.
(lifted that definition off the net actually!)
Minimum value is -32768 and a maximum of 32767.
u8 is a plain old byte. 8 bits unsigned 0 to 255 (only 256 possible values).

ok!
Quote:

You'll be able to copy the value of a byte to a short, but not the other way round.
If you're only learning, and it helps, you can make a new short
"anotherbuffer"
and copy either a u8 or short value to it, and then at the recieving end
you can copy the value from that back to a u8 or short variable type.


something like, sender:
Code:

u8 audiobuffer[4096];
short anotherbuffer[4096];
result = sceUsbCamReadMicBlocking(audiobuffer, sizeof(Myaudiobuffer));
for (i=0; i<4096;i++) {
anotherbuffer[i]=(short*) audiobuffer[i];      
}
send(anotherbuffer);


receiving with audiocallback:
Code:

sample_t* ubuf = (sample_t*) buf;
short ReceiveBuffer[1024]
ubuf[i].l = ReceiveBuffer[i];
ubuf[i].r = ReceivedBuffer[i];
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Art



Joined: 09 Nov 2005
Posts: 647
PostPosted: Mon Nov 03, 2008 4:57 pm    Post subject: Reply with quote
Quote:

But how can I output sounds as "short" from the incoming GoCam buffer Microphone as well as it is u8 type and not short?

Thanks, may be it is a stupid conversion, I'm sorry for my poor knowledge.

Maybe it doesn't matter anymore, but you just write double the number of bytes into the buffer :D

BTW...
Talkman mic isn't the same as the camera mic.
If you've used the Talkman mic pls let me know...
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