faq.txt

rockbox掌上游戏机源码,包括pc仿真和小机代码

Q42: Does Rockbox support other fonts/character sets?
A42: Recorders do, Players don't.

Q43: How do I use the loadable fonts?
A43: If you own a Recorder see: http://www.rockbox.org/fonts/  Players
     cannot make use of loadable fonts.

Q44: Why can't I use loadable fonts on the Player? 
A44: This is because the Player font is character cell based (as opposed to 
     the Recorder's bitmap based display).  This
     means that we are able to choose what characters to display, but not how
     to display them.  We do have the ability to change/create up to 4 chars 
     on one model and 8 on another, however we are currently using several of 
     these 'letters' to store icons for the player.

Q45: Why don't you have as many games available for the Players?
A45: The display on the Players is character cell and not bitmap based.  
     This means there is much more limitations in the amount of graphics that
     can be displayed, and thus what kind of games can be written.

Q46: I keep shutting off my player in my pocket. Can the OFF (Recorder) or
     STOP (Player) key be locked?
A46: No. Unfortunately, the ON/OFF mechanisms are handled entirely in
     hardware. The firmware can read the keys, but can't prevent them from
     shutting off the player.

Q47: Can I record with Rockbox?
A47: You sure can.  Take a look at our manual.  
     http://www.rockbox.org/manual/manual.pdf

Q48: Now that I can record, can I use custom codecs (like LAME)?
A48: The MP3 encoder is in the MAS3587F chip, and nothing we can change.

Q49: What are the max/min bitrates for recording on the Recorder's encoder?
A49: The builtin encoder is variable bit rate only with a max of 192kbit/s,
     and a min of 32kbit/s.

Q50: Would it be possible to record from line in on the player?
A50: No.

Q51: I have a question about the id3v1 and id3v2 tags...
A51: Rockbox supports both id3v1 and id3v2.  If you have problems,
     report it to the developers and please provide an example.

Q52: Where exactly did the name 'Rockbox' come from?
A52: Well you can follow the full line of emails at 
     http://www.rockbox.org/mail/archive/rockbox-archive-2002-01/0062.shtml
     However, the brief rundown is that it was recommended first by 
     Tome Cvitan, and put to a vote (which it lost). 

     Funny thing about democracies.  This isn't one ;)  Our beloved project
     leader vetoed the winning name and chose Rockbox instead.
     http://www.rockbox.org/mail/archive/rockbox-archive-2002-01/0134.shtml
     
     There you have it.  Recommended by users, decision by dictator.

Q53: Why is there a limit of 400 files in a directory?
A53: This is a configurable value, 400 files is just the default.

Q54: Why is there a 10,000 song limit on playlists?
A54: This is a configurable value, 10,000 songs is just the default.

Q55: How can I make playlists on my PC?
A55: There are many programs that can create .m3u playlists. WinAmp is one.
     Another simple method, that requires no extra software, is to use dir:

       dir /b /s X:\ > X:\allfiles.m3u
       dir /b /s X:\Pop > X:\pop.m3u

     ...where X: is your Archos drive.

     Linux users can use the 'find' command:

       cd /mnt/archos
       find . -name "*.mp3" > all.m3u

     Remember that playlists are simple text files. You can edit them with any
     normal text editor.

Q56: How does the shuffle work?
A56: It sees the playlist as a deck of cards, shuffling the entries using a
     pseudo-random generator called the Mersenne Twister. After shuffling,
     the list is never changed again until you re-shuffle the list, by
     stopping the playback and restarting. If the repeat mode is enabled,
     the list will simply start over from the first file again, without
     re-shuffling.
     The random seed is stored in the persistent setting area, so that the
     resume feature can shuffle the playlist in exactly the same way when
     resuming.

Q57: How can I find out about all the neat features that Rockbox has?
A57: This information is in our manual (It sometimes gets a bit out of
     date, so please bear with us.)  The information you are most likely 
     looking for is a bit down the tree, so the here is the url:
     http://www.rockbox.org/manual/rec-general.html

     Also, check out the features-list at:
     http://www.rockbox.org/docs/features.html

Q58: How can I see what bugs are currently open/being worked on?
A58: Check out http://www.rockbox.org/bugs.shtml for a listing of bugs
     that have been reported.

Q59: How can I report about bugs in Rockbox?
A59: If we were better programmers we would take that as an insult.  But we
     aren't, so we won't.  The first step in reporting a bug is to review 
     the rules we ask you to follow in your submission (listed at: 
     http://www.rockbox.org/bugs.shtml#rules).

     Please note that we ask reports of bugs in CVS/daily builds to be sent
     to the mailing list, and bugs in released versions of Rockbox to be
     submitted through SourceForge's bug tracker.  (A link to the bug tracker
     can be found under our bug submission rules.)

Q60: What's with all the different versions of Rockbox?

A60: We currently support four different hardware platforms: Players, Recorder
     v1, Recorder v2 and FM Recorder.
     For each platform, Rockbox is released in three versions: Release, Daily
     Build and Bleeding Edge. These only differ in release frequency.

     The Release version (currently 2.3) is a frozen known-good state. This
     means that we are confident that few, if any, significant bugs reside
     within the code for that version. This is the version for the common
     user, *except for Ondio*. Use a current daily build for Ondio.
     There are 2 bugs in the 2.3 release that render it not recommended for
     Ondio: (1) Saving configuration files or radio presets takes ages, and
     wears the flash chip much more than necessary. (2) Rockbox 2.3 does not
     yet support all Ondio hardware variants. This may lead to non-working
     storage access both from rockbox and via USB.

     The Daily Builds (http://www.rockbox.org/daily.shtml) are automated
     daily builds of the CVS (development) code.  As such they contain all the
     new features (and bugs) that have been introduced after the last official
     release, up to this morning.

     The Bleeding Edge builds (http://www.rockbox.org/daily.shtml#bleeding_edge)
     are built from the CVS code every 20 minutes. The purpose of these builds
     is to verify the code builds properly on all platforms (and simulators)
     and also to allow testers to try out new features and bug fixes without
     having to build the code themselves.
 
     Please Note: Bleeding Edge builds are expected to be buggy at times. We
     ask that you _do not_ submit bug reports for Bleeding Edge builds, but
     would love to hear any reports you may have about Release or Daily build
     versions. (see "How can I report about bugs in Rockbox?")
            
Q61: I am in Windows and can't create a .rockbox directory to store my
     files.  When are you going to fix this?
A61: You don't need to. The directory should have been created when you
     installed Rockbox. If it wasn't created, you haven't installed it
     correctly. Re-read the installation instructions on the download page:

     http://www.rockbox.org/download/

Q62: I own a Mac.  I can't seem to create the .rockbox file.  Can you 
     fix this?
A62: See question 61.
         
Q63: Will Rockbox work on any of Archos' other units?
A63: Other than the 6 currently supported models: no, probably not. If Archos
     releases another rockbox-able player (such as the V2) then rockbox will
     find its way onto it, but their new devices as the Gmini, MM, and AV
     units are completely different hardware and probably won't be supported
     by Rockbox unless someone enthusiastically reverse engineers them and
     submits patches to make it happen.

     See also: http://www.rockbox.org/docs/nodo.html#7

Q64: I installed Rockbox, removed the jukebox safely and rebooted, but Rockbox
     still didn't load. What is wrong? I am running Windows.
A64: The old MOD/AJZ was not entirely deleted from the disk. It is still
     there, and the boot loader finds that one instead of the new file. Here's
     what you can do:

     - Download and install Directory Snoop (version 4.03 in November 2002)
     from http://www.briggsoft.com/dsnoop.htm.
     It's shareware, the trial version can be used 25 times.

     Directory Snoop can display true drive contents by bypassing the
     operating system and reading the raw drive sectors directly.

     - Plug the Jukebox in the PC as usual and power on

     - Launch Directory snoop

     - Click on the Jukebox drive letter in the [select drive] field in the
     toolbar. The content of the jukebox hard drive appears in the main
     window. Files which appear in red color don't seem to be present on the
     hard drive, but they still here.

     - Simply select the appropriate files (red color) and purge them
     (Purge button). Of course, don't erase the new archos.mod file and the
     .rockbox directory :)

     - Safely remove (Windows unmount device function) the Jukebox.
     Power it up and ...voila... Rockbox is there!

     (Thanks to Olivier Rafidison for this info)

     Another alternative:

     - Copy the firmware file to the jukebox again. Windows will rename it to "Copy of XXXXX"

     - Delete the original firmware file and remove the "Copy of" part from the new file name

     - Reboot

     If it doesn't load the correct firmware, do the whle procedure again until the new file is recognized.

Q65: What kind of mic can I connect to my AJBR?
A65: There are several types of microphones.

     Dynamic: The one that's available from Archos is a dynamic one.
     Their output level is high enough so that they don't need an
     amplifier (that's the reason why the Archos mic is of this type -
     it's cheap).
      - cheap
      - no good sound quality of cheap dynamic mics (good enough for
        speech)
      - no amplifier needed

     Backplate Condenser: These are the professional mics. They need phantom
     power (48V) for charging the condenser.
     They also need an amplifier, because their output level is low.
       - good sound quality
       - need phantom power (48V)
       - need amplifier
       - expensive              
 
     Electret Condenser: These capsules are cheap and result in a good
     recording quality. They don't need phantom power voltage. They need power
     for the FET (field effect transistor) that's inside. If you have such a
     mic with a battery in it, it is mostly because of the FET power, not
     because of an amplification circuit inside the mic.  These mics are in
     all the consumer products like mobile phones, PC headsets and so on.
       - cheap (2 EUR for a capsule)
       - good sound quality
       - need amplifier
       - need power for the FET (1,5 - 15V)

     Recommendation for do-it-yourselfers: Use electret condenser mic capsules,
     solder an amplifier for them which both amplifies the output level
     and feeds the power needed for the FET to the capsule.
     The one on http://www.geocities.com/ferocious_1999/md/micpreamp2.html
     was soldered and tested by Uwe Freese, and it works.
     There are some others available from www.elv.de and other sellers.

     Recommendation for others: Buy some mic + preamp combination which can be
     plugged into a line in of any amplifier. Maybe such a commercially
     available combination needs a power supply and doesn't work with
     batteries. Some are very expensive. You might have some luck at
     http://www.giant-squid-audio-lab.com/.

     What does not work: Don't use an amplifier thing that is simply connected
     between some mic cable. Maybe it sounds as if it could work, but I