Author
| MP3 player for MSX
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wolf_
online
msx legend
Posts: 4629 |  Posted: March 24 2007, 14:50 |
Hm.. so, to fade in/out music (or just change the global volume anyway), do you NEED that extra chip? Or can fading/volume also be done without that extra chip?
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wolf_
online
msx legend
Posts: 4629 | Posted: March 24 2007, 14:54 |
Another thing of interest:
Can this main chip also playback/loop OGG?
There's this issue about MP3 concerning loops. AFAIK MP3 can't loop without a small hickup, whereas OGG can. Naturally for games and demos, a seamless loop is quite important.
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Prodatron
msx master
Posts: 1088 | Posted: March 24 2007, 21:29 |
There is no OGG support mentioned in the document ( http://www.walrus.com/~raphael/mp3/MMC_version/vs1011b.pdf -> MP3 and WAV/PCM). Do MP3s contain keyframes? If yes, looping without hickups should be possible - but who knows...
After a quick look on the document again, I also couldn't find a "master volume" register, which you would need for fade in/out. |
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wolf_
online
msx legend
Posts: 4629 | Posted: March 24 2007, 22:15 |
Hmmm.. to me it sounds somewhat silly to require a whole other chip just to change the volume, but alas.. I think changing volume is quite required for practical uses, it would mean that everyone's best served with the extra chip..
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spl
msx professional
Posts: 718 | Posted: March 25 2007, 18:19 |
Wolf, you can use a external mixer for volume up and down, for example, simple volume controls on external speakers.... not? And I think you can do some controls by software...
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wolf_
online
msx legend
Posts: 4629 | Posted: March 25 2007, 18:36 |
You don't want external mixers/amps to control the volume.. 
If a game or demo wants its music to fade out, and other music to fade in, then you don't want to be forced to use an external mixer/amp for that. E.g. a text on screen: "press space and fade out please" and after that: "press space and quickly fade in please" ^_^
If it was only for EQ'ing or the spatial sound, then we wouldn't need this chip, but volume is so essential that we can't really be without it.. *unless* volume can be done with the first chip, then we don't really need the 2nd chip.. |
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spl
msx professional
Posts: 718 | Posted: March 25 2007, 18:45 |
Ok, yes now I understand  |
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manuel
msx guru
Posts: 3366 | Posted: March 25 2007, 19:03 |
Read that VS1011 document: it mentions a volume control register.
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Prodatron
msx master
Posts: 1088 | Posted: March 25 2007, 19:49 |
Ops, correct. I searched at the wrong place last time.
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wolf_
online
msx legend
Posts: 4629 | Posted: March 25 2007, 19:58 |
So, the first chip (e.g. the cheaper version of the card) can do volume? If so, there's little point in having the more expensive option, if you ask me..
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Yobi
msx lover
Posts: 90 | Posted: March 25 2007, 20:53 |
If you have no I2C mixer you can still control volume.
But you need an external mixer to mix MSX sounds with the mp3 music.
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PingPong
msx professional
Posts: 869 | Posted: March 25 2007, 21:32 |
Does the sound will be outputted to the (mono) TV?
Or does the cartridge have a line out connector?
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Yobi
msx lover
Posts: 90 | Posted: March 25 2007, 21:39 |
There will be a jack or tulip output. (stereo)
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Patsie
msx freak
Posts: 186 | Posted: March 25 2007, 23:04 |
so 2 speakers for this MP3 cart., 2 speakers for moonblaster, 2 speakers for the standard (and/or SCC) output. We could build a surround sound home theather studio with our MSX(!)  |
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PingPong
msx professional
Posts: 869 | Posted: March 26 2007, 10:58 |
Quote:
| There will be a jack or tulip output. (stereo)
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So, clarify me, please, No monoaural output throught the pin on the computer? |
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