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Rockbox Ports are now being developed for various digital audio players!

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Author Topic: Playing two sounds simultaneously  (Read 3567 times)

Offline Quixotic

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Playing two sounds simultaneously
« on: February 23, 2008, 04:51:01 PM »
Hello!

I use rockbox (primarily) for playing FLACs, specifically for auto-hypnosis brainfood files called Binaural Beats. When I go running, I often make my own mix of Psy-Trance and a mix of Alpha/Beta waves. It's my hypnosis, mystic connection to nature and exercise blended. I was wondering if there's a way to make rockbox play two sounds simultaneously - one a database playlist, and the other, a FLAC file - in "real time", without me having to mix them before-hand.

Thanks ahead of time...
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Offline nls

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Re: Playing two sounds simultaneously
« Reply #1 on: February 23, 2008, 09:03:23 PM »
Not currently and not likely in the future either. Rockbox playback is designed around a single audio source principle and would have to be redesigned to support playing multiple audio files at the same time.
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Offline Quixotic

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Re: Playing two sounds simultaneously
« Reply #2 on: February 27, 2008, 12:26:34 AM »
Is there an alternative to the audio player? If both of those would be playing, you're saying one of them would simply be cut, or both have crossfeed?
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Offline GodEater

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Re: Playing two sounds simultaneously
« Reply #3 on: February 27, 2008, 03:27:45 AM »
He's saying you can't play both at all. Either one or the other. Also - I'm not sure you've gathered what crossfeed is :D
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Offline Quixotic

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Re: Playing two sounds simultaneously
« Reply #4 on: February 27, 2008, 11:47:02 PM »
Give a break with my fanookling for some MacGyver method, clearly I'm going through the 5 stages of grief and am now at denial. As far as crossfeed - I'm quite certain on using correct lexicon - binaural, meaning a hard left/right, would cease in case of a crossfeed - if - the sound was mixed with another.  ::)
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Offline Febs

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Re: Playing two sounds simultaneously
« Reply #5 on: February 28, 2008, 10:32:22 AM »
OK, then, what does crossfeed have to do with what you are requesting?  Crossfeed mixes the L and R channels of a single stereo playback stream [1].  What you are talking about is mixing two separate playback streams.  I'm not sure what relevance one has to the other in this context.

[1] It is more complicated than that, because there is some delay and bandpass filtering going on, but those details aren't relevant to my point.
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Offline markun

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Re: Playing two sounds simultaneously
« Reply #6 on: February 29, 2008, 03:04:37 AM »
Quote from: Febs on February 28, 2008, 10:32:22 AM
OK, then, what does crossfeed have to do with what you are requesting?

When I first read his post I thought he still didn't understand what crossfeed was, but I guess he means that the binaural beats would have to be mixed in after the DSP stage for maximum effect (or at least after the crossfeed and stereo-width stages)
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Offline Quixotic

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Re: Playing two sounds simultaneously
« Reply #7 on: February 29, 2008, 12:40:08 PM »
"the binaural beats would have to be mixed in after the DSP stage for maximum effect"

That would be the most preferable scenario. I'm making it confusing am I not? Ok, what I intended to say was if the two sounds were mixed if that would have a crossfeed on the separate channels. But I know...unlikely, probably not gonna happen anyway, etc. Thnks for your work anyway, I love rockbox nontheless.
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Offline markun

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Re: Playing two sounds simultaneously
« Reply #8 on: February 29, 2008, 02:20:47 PM »
Quote from: Quixotic on February 29, 2008, 12:40:08 PM
But I know...unlikely, probably not gonna happen anyway, etc.

Rockbox is open source, so you just have to learn programming and make it happen :)
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