Support and General Use > Hardware
Battery from ipod nano 2g/3g in 1g ...?
saratoga:
--- Quote from: delt on August 09, 2008, 11:02:44 PM ---So, the firmware being simply more efficient (as opposed to having a different type of battery)
--- End quote ---
I don't think its the firmware, but rather that they switched to newer CPUs that used way less power.
--- Quote from: delt on August 09, 2008, 11:02:44 PM ---it's possible rockbox will someday outperform the apple firmware in terms of battery life? ;D ;D ;D
--- End quote ---
I wouldn't be suprised if we already did, provided you used only FLAC/MPC and played around with the CPU clock a bit.
delt:
--- Quote ---I don't think its the firmware, but rather that they switched to newer CPUs that used way less power.
--- End quote ---
I also suspect that - not only the cpu, but probably the rest of the physical components as well.
--- Quote ---I wouldn't be suprised if we already did, provided you used only FLAC/MPC and played around with the CPU clock a bit.
--- End quote ---
That would be awesome. I typically re-encode my mp3 files with lame to 32KHz 80 or 96 kbps, which enables me to fit about 150% more music on a portable player compared to standard 128kbps. At 22 or 24KHz it starts to sound a bit crappy, but still enjoyable. I assume FLAC takes up a -lot- more space since it's lossless compression, right? what about MPC?
And more importantly (i think) how do you change the CPU clock? It would be really helpful if i could downclock it to save power!! I haven't found such a setting when fiddling with it, or looking at the manual :D
saratoga:
--- Quote from: delt on August 10, 2008, 02:00:14 AM ---That would be awesome. I typically re-encode my mp3 files with lame to 32KHz 80 or 96 kbps, which enables me to fit about 150% more music on a portable player compared to standard 128kbps. At 22 or 24KHz it starts to sound a bit crappy, but still enjoyable.
--- End quote ---
Don't change the sample rate. That'll eat up a lot more CPU power and reduce quality since rockbox has to convert it back to 44.1kHz for playback.
--- Quote from: delt on August 10, 2008, 02:00:14 AM ---what about MPC?
--- End quote ---
Its pretty similar to MP3.
--- Quote from: delt on August 10, 2008, 02:00:14 AM ---And more importantly (i think) how do you change the CPU clock? It would be really helpful if i could downclock it to save power!! I haven't found such a setting when fiddling with it, or looking at the manual :D
--- End quote ---
You have to change the code. Theres a filespray entry about it somewhere on the patch tracker.
delt:
--- Quote ---Don't change the sample rate. That'll eat up a lot more CPU power and reduce quality since rockbox has to convert it back to 44.1kHz for playback.
--- End quote ---
hmmm.... i'll do some extra testing to see how much battery power is lost because of this. I really like fitting a whole bunch of extra mp3's, and the audio quality is still very acceptable.
--- Quote ---Its [MPC] pretty similar to MP3.
--- End quote ---
... but uses a lot less CPU, as i understand from your above post?
--- Quote ---You have to change the code. Theres a filespray entry about it somewhere on the patch tracker.
--- End quote ---
Aha. I assume you need a specific cross-compiler to generate code that's useable by the ipod hardware? Where could i find such compiler, and associated linker/tools/etc...? (i haven't looked at rockbox's source code yet)
aspartam:
Here you can read, how to compile the source code: http://www.rockbox.org/twiki/bin/view/Main/SimpleGuideToCompiling
But it would be complicated I think. I looked at it once and it was quite a lot :-\
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