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yokfran
Joined: 28 Dec 2009
Posts: 16
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 Posted: Sun Jan 31, 2010 8:46 pm Post subject: audio mixing?? |
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i'm wondering how to mix two or more sound stream.
is there any internal functions to mix the audio(buffer)?
i've searched all the pspsdk "src" dir by word "mix", but only one line found:
| Code: | | try("ms0:/PSP/../PSP/"); /* mixed */ |
so i really dont know how to do, but i've seen a thread named "SceAudioMixer" from psplink.
If anyone knows, please teach me how to mix audio through internal functions.
thank u very much. |
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Torch
Joined: 28 May 2008
Posts: 842
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| Posted: Mon Feb 01, 2010 2:02 am Post subject: |
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| No one mixes audio in real time games. That's why you need a sound card with lots of channels. Just play each on a different channel. |
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yokfran
Joined: 28 Dec 2009
Posts: 16
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| Posted: Mon Feb 01, 2010 1:11 pm Post subject: |
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| Torch wrote: | | No one mixes audio in real time games. That's why you need a sound card with lots of channels. Just play each on a different channel. |
thanks for the reply
So, i have to mix audio buffers in another thread. |
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m0skit0
Joined: 02 Jun 2009
Posts: 226
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| Posted: Mon Feb 01, 2010 8:17 pm Post subject: |
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No, I think Torch means play one sound in one channel, the other in other channel, simultaneously, then you get a mixed result.
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| The Incredible Bill Gates wrote: | | The obvious mathematical breakthrough would be development of an easy way to factor large prime numbers. |
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yokfran
Joined: 28 Dec 2009
Posts: 16
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| Posted: Tue Feb 02, 2010 1:31 am Post subject: |
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| m0skit0 wrote: | | No, I think Torch means play one sound in one channel, the other in other channel, simultaneously, then you get a mixed result. |
I think he said "sound card" that means he was saying the situation on PC.
(Does psp have hardware sound card? I dont know...)
The psp has only 8 audio channels, but I want 2 channels for each music/sound, so i must create 4 threads for audio output.
I dont know each size of each audio stream, one maybe 1 sec(short sound), or maybe 2 min(long music), so I cannot just play them directly, thay must be mixed before output function called.
So I want to know, is there an internal functions to mix audio, better via psp hardware. Like decode atrac3/mp3... |
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Torch
Joined: 28 May 2008
Posts: 842
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| Posted: Tue Feb 02, 2010 2:24 am Post subject: |
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| You have to manage with 8 channels. |
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crazyc
Joined: 17 Jun 2005
Posts: 410
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| Posted: Tue Feb 02, 2010 2:31 am Post subject: |
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| Torch wrote: | | You have to manage with 8 channels. |
The PSP (at least 1000 and 2000) has only 1 hardware stereo channel. The mixing of the 8 "channels" occurs in a kernel thread. If you mix yourself use sceAudioSRCOutputBlocking for a nice performance boost due to the skipping of the software mixer and get hardware sample rate conversion as a bonus. |
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yokfran
Joined: 28 Dec 2009
Posts: 16
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| Posted: Tue Feb 02, 2010 2:32 am Post subject: |
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| Torch wrote: | | You have to manage with 8 channels. |
Right,
but one thing i cared about is, sometimes there may be lot of audio streams playing at the same time, so mixing is necessary.
Thanks for the advice. |
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