Raw Audio

Post by **Nach** » Mon Apr 18, 2005 4:03 am

I want to get a raw audio dump from ZSNES.

Anyone know which buffer I should be trying to steal, and how I should be stealing it?

Nightcrawler · Post by **Nightcrawler** » Mon Apr 18, 2005 7:52 pm

From what I gather, the raw sound data is contained in 'DSPBuffer'

As far as how.. I can't help too much but I can tell you a few things..

1.). You can rip that data from the windows port anytime there is a frame update and the DSPBuffer data is copied to the DirectSound primary buffer to be played. (UpdateVFrame() function)

2.) You can also find reference in the DOS port(sound.asm) where you can do the same thing.

3.) Same concept for the Linux port.. in the UpdateVFrame(void) function.

4.) To make one change to affect all ports, you can probably hit up 'dspproc.asm' and grab some data there. I'm a little rusty on my 32-bit x86 assembly and as always the ZSNES code annoys me with no comments

So, I'm not exactly sure where the best place to pull some data would be there.

As far as how you need to steal it. I think being that it should be RAW sound data, you just need to know the format the data is in(frequency, sample rate etc..) to play it back. I can grab that info from the DirectSound code if you want. I don't have much time to look at this stuff now.

anomie · Post by **anomie** » Mon Apr 18, 2005 10:16 pm

Nightcrawler wrote:As far as how you need to steal it. I think being that it should be RAW sound data, you just need to know the format the data is in(frequency, sample rate etc..) to play it back.

If you really have RAW SNES sound data, that'd be stereo 16-bit linear at 32000Hz. But i wouldn't be terribly surprised if zsnes is spitting out mono/stereo 8/16-bit linear (depending on the audio confifg) at the configured output rate into DSPBuffer...

Nightcrawler · Post by **Nightcrawler** » Tue Apr 19, 2005 5:37 pm

anomie wrote:
Nightcrawler wrote:As far as how you need to steal it. I think being that it should be RAW sound data, you just need to know the format the data is in(frequency, sample rate etc..) to play it back.
If you really have RAW SNES sound data, that'd be stereo 16-bit linear at 32000Hz. But i wouldn't be terribly surprised if zsnes is spitting out mono/stereo 8/16-bit linear (depending on the audio confifg) at the configured output rate into DSPBuffer...

You're right. The DirectSound buffer format is set depending upon the configuration. So, you'd have to grab the config info, then rip the data from the buffer. Add a WAV file header to it and then you could rip the data directly to a playable wave file.