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Atari coding BBS
| Re: adpcm or similar? |
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Posted by: earx
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May,29.2006-08:57
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That's good news. =) I also worked on some ADPCM stuff (VAG) and it to work quite nicely. I got it running at 1:3.75 compression ratio. I can hear no quality loss.. Now did a DSP decoder for it, which uses about 3% DSP time and 2 kwords of RAM. I can try the AMI also. It looks comparable.
BTW Ultra did a VAG-for-graphics test and that looked a bit messy around the edges, funny to see =)
As for the MP2: some profiling shows that the DCT routs are the biggest time consumers in the decoder. for instance: the track from beams (64 kpbs, mono, 32.768 kHz) took:
a) 3% for dma transfers
b) 5% for look-ups and bitfield operations
c) 20% for DCT routs
a) and b) may be further optimised, but c) consists of really dense loops. very optimised, already. maybe a few percent are possible.. but anyway.. you'll stay at a higher dsp time than an 8 chan mod, that's for sure..
and way way higher than ADPCM streaming ;)
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Topic
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Posted by
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Date
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adpcm or similar?
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mikro
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May,21.2006-15:19
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Re: adpcm or similar?
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stghost
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May,21.2006-22:26
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Re: adpcm or similar?
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earx
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May,22.2006-09:20
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Re: adpcm or similar?
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mikro
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May,22.2006-12:38
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Re: adpcm or similar?
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earx
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May,22.2006-13:06
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Re: adpcm or similar?
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earx
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May,22.2006-13:24
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Re: adpcm or similar?
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ray
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May,22.2006-19:09
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Re: adpcm or similar?
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earx
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May,22.2006-22:48
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Re: adpcm or similar?
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gizmo
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May,23.2006-08:09
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Re: adpcm or similar?
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mikro
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May,23.2006-10:25
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Re: adpcm or similar?
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gizmo
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May,23.2006-20:23
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Re: adpcm or similar?
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earx
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May,23.2006-10:30
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Re: adpcm or similar?
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mikro
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May,23.2006-10:35
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Re: adpcm or similar?
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mikro
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May,27.2006-01:12
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Re: adpcm or similar?
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mikro
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May,27.2006-01:17
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Re: adpcm or similar?
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mikro
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May,27.2006-01:19
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Re: adpcm or similar?
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gizmo
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May,27.2006-10:45
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Re: adpcm or similar?
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mikro
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May,28.2006-14:24
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Re: adpcm or similar?
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earx
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May,29.2006-08:57
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Re: adpcm or similar?
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sqward
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May,29.2006-09:51
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Re: adpcm or similar?
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mikro
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May,29.2006-12:31
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Re: adpcm or similar?
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earx
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May,29.2006-13:18
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Re: adpcm or similar?
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sqward
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May,29.2006-14:13
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Re: adpcm or similar?
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sqward
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May,29.2006-14:19
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Re: adpcm or similar?
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mikro
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May,30.2006-13:45
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Re: adpcm or similar?
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earx
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May,30.2006-16:28
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Re: adpcm or similar?
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mikro
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May,31.2006-14:19
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Re: adpcm or similar?
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gwEm
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May,31.2006-17:59
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Re: adpcm or similar?
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ggn/KUA
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May,31.2006-22:26
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Re: adpcm or similar?
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gwEm
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Jun,06.2006-09:52
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Re: adpcm or similar?
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gwEm
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Jun,06.2006-10:03
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What's the anti-troll code?
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Don't have a code or forgot it? Fix it here.
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