FAQ
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上传日期:2007-01-06
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- Frequently Asked Questions
- Status
- ======
- Q: What is the copyright status of cdda2wav?
- A: Cdda2wav is software copyrighted by Heiko Eissfeldt and released under the
- General Public License from the Free Software Foundation (see file GPL).
- Compilation
- ===========
- Q: What are the requirements to run cdda2wav?
- A: All operating systems that are supported by cdrecord should also be able to
- run cdda2wav. Currently DOS and Windows are not covered.
- Requirements of previous versions of cdda2wav have been cut down for the
- sake of portability. Features like fork(), realtime scheduling, or shared
- memory are all optional now. You need a shell, which runs autoconf, a c
- compiler (even a K&R compiler should work) and a c library to build cdda2wav
- on a supported operating system. To run cdda2wav, a SCSI transport
- implementation for the os, a cdrom or cd burner device to read from, and
- at least say 65K of memory for buffers are needed.
- Q: Why does it not compile under Linux, although I am using the newest kernel?
- A: There have been changes in the generic driver by Douglas Gilbert, that are
- in its first release not compatible with the scsi library from Joerg
- Schilling. We are working on this problem...
- In the meantime better do not use this variant, use the older one instead.
- Q: Why does it not compile using standard make?
- A: Like cdrecord, cdda2wav needs a sophisticated make program like Joerg
- Schilling's smake or GNU gmake. Pure posix make functionality is not enough.
- Setting Up (for now Linux only)
- ===============================
- Q: Should I use scsi emulation or the eide driver for my ATAPI cdrom drive?
- A: Scsi emulation is preferred, since it enables cdda2wav to use more commands
- and is often the only way to get special information like track titles with
- cd-text. The emulation module is called ide-scsi, the eide module is called
- ide-cd.
- Q: How can I use my parallel-port-connected cdrom with cdda2wav?
- A: Under Linux there is a driver, that makes this device under SCSI
- emulation available. For more information see the cdrecord documentation.
- Q: How do I check, if the current Linux kernel does support generic SCSI?
- A: run 'cat /proc/devices | grep "21 sg"' and see, if a line with 'sg' appears.
- If it does not appear, the current kernel is not able to use the generic_scsi
- interface. If you have generic SCSI support compiled as a module, see next
- question, otherwise you need to recompile the kernel and enable generic SCSI.
- You might try to use the 'cooked_ioctl' interface as a last resort, but then
- you need to supply a cdrom device with -D (like -D/dev/cdrom). In this case
- cdda2wav completely relies on the cdda reading methods from the kernel
- driver, so it might not work (due to unsupported).
- Q: How do I load the generic SCSI module by hand?
- A: run 'insmod sg' and check the result (see above).
- Q: How do I find the device setting for my drive?
- A: Under Linux use the script scan_scsi.Linux. It prints the available devices
- and their respective device option to be used.
- Be aware of the fact that the generic device naming may change whenever the
- devices on the SCSI bus change (present or not present).
- General usage (sampling)
- ========================
- Q: How do I record the whole cd, each track in a seperate file?
- A: Use the '-B' option. This will automagically create a file for each track.
- Q: How do I record the whole cd into one file?
- A: Just extend the default recording time from one track to a big enough
- time in seconds to cover the whole cd (like -d99999).
- Q: How do I record successive tracks (a track range) into seperate files?
- A: Use the '-B' option and -t<first tracknumber>+<last track number>.
- Q: How do I record successive tracks (a track range) into one file?
- A: Use -t<first tracknumber>+<last track number>.
- Q: How do I record different tracks into seperate files with individual file
- names?
- A: Use the supplied script 'readmult'. For usage see the comments at the
- beginning of the script.
- Q: How can I get the highest speed out of cdda2wav?
- A: See the file README. There is a section about performance and what is
- influencing it.
- Q: How can I burn audio cds with cdda2wav and cdrecord on-the-fly?
- A: This has not been tested very well, so caveat emptor. It is possible to
- use cdda2wav and cdrecord with pipes, _but_ there are several issues.
- 1.: The cd drive may become too slow to keep cdrecords buffer happy, when
- a scratch on the audio cd is encountered, and several retries take place.
- 2.: Currently there is no way to carry individual track information from
- cdda2wav to cdrecord. Several information bits are available very late
- but are needed in advance from cdrecord.
- 3.: Some operating systems have limitations in multiple SCSI accesses and
- other ressources (shared memory). cdda2wav and cdrecord may block each
- other, or might fight over limited ressources.
- For these reasons it is not recommended to burn on-the-fly with cdda2wav.
- Frontends
- =========
- Q: Which frontends for cdda2wav are available?
- A: See the file 'Frontends'. There are command line and graphical frontends.
- Album and track titles
- ======================
- Q: Does cdda2wav support titles from cd extra (aka cd plus aka enhanced cd)?
- A: In general, yes. In order to get this information, cdda2wav needs to read
- a data sector from the second session of the cd. This requires multisession
- support and the capability to read XA sectors. The titles are printed on the
- screen and written into the inf files, then.
- Q: Does cdda2wav support titles from cd-text?
- A: Newer versions support the most important features of cd-text like titles
- and creators. Non-supported are currently 16-bit characters, so asian
- titles etc. are currently not available.
- Q: Does cdda2wav support CDDB ids?
- A: Yes, while it does not make CDDB lookups itself, it supplies an cddb file
- with the table of contents and the cddb id. For cddb lookups see the
- perl script tracknames.pl and tracknames.txt. If the titles are known to
- cdda2wav, it fills the titles itself in the cddb file.
- Q: What is the MCN?
- A: The media catalog number is an unique id for the audio cd release. It is
- similar to the ISBN for books, but unfortunately it is included only on
- some audio cds.
- Q: What is the ISRC?
- A: The International Standard Record Code is an unique id for a track. Like the
- MCN (see above) it is an optional item.
- MP3 coding
- ==========
- Q: Does cdda2wav support on-the-fly mp3-coding?
- A: Not yet :-). But I added two scripts to use an external encoder. The trick
- is to avoid big temporary files. So I made two versions (cdda2mp3 and
- cdda2mp3.new), one using pipes, and one using a named pipe. The examples
- use the Fraunhofer encoder 'l3enc', which is a commercial product and has
- to be purchased seperately. Other encoders should be usable in a similar way.
- Conversions
- ===========
- Q: How do I create a file suitable for cd burning?
- A: If you are using cdrecord, you can produce cdr or wav files. To select
- cdr files, use -Ocdr, to select wav files use -Owav (the default).
- Audio files that have been recorded with a length not a multiple of the
- audio sector size 2352 bytes, should be used with cdrecords -pad option.
- Q: How do I convert a wav file into a cdr file (my other cd burning program
- does not accept wav format)?
- A: Use 'dd if=wavfile of=cdrfile conv=swab ibs=44 skip=1 obs=2352'
- Q: How to convert cdr to wav?
- A: Use sox, the sound utility. It supports other formats as well.
- Specials
- ========
- Q: Does cdda2wav support the pre-emphasis bit?
- A: If the table of contents marks a track as pre-emphasized, the corresponding
- inf file will have this information, too. That enables a cd burning program
- to retain the state of the track.
- Q: Can cdda2wav undo the pre-emphasis effect in the samples?
- A: Yes, if the -T option is given (and cd quality is selected),
- cdda2wav filters the samples with the reverse emphasis on-the-fly. This has
- been checked with a sine sweep from a pre-emphasized test cd.
- Q: My cdrom delivers the stereo channels swapped. How can I undo this?
- A: Use the -cs option.
- Q: Does cdda2wav support indices?
- A: Yes, but since there are positioning problems with a lot of drives,
- information might be inaccurate. A start index can be specified with the
- -i option. To get all indices, use the -v7 option.
- Q: Can cdda2wav avoid including the pre-gap region at the end of the track?
- A: Currently not. This might be added later, but is not easily done.
- Q: How can I get all information about the cd without writing files?
- A: Use the -J option, which switches analysis to the max, and aborts after
- the report.
- Q: Can cdda2wav display/save the graphics on my CD+graphics disc?
- A: No, this is not planned. A seperate X11 program could do that probably
- better.
- Q: Can cdda2wav read the audio portion from my CD-I/Video-CD/DVD mpeg streams?
- A: No, these are special formats, which require much more effort.
- User support/feedback
- =====================
- Q: Cdda2wav is great. How can I support you to encourage further development?
- A: Look into the file NEEDED. Also constructive criticism and feedback is
- appreciated.
- Q: I want to port cdrtools (cdrecord/mkisofs/cdda2wav) to a new platform (like
- DJGPP,cygwin,os/2). How should I proceed?
- A: It would be convenient to have a unix like environment (like cygwin provides) A shell, and a make program would be needed to first create smake (in order
- to make the makefile system working). Another critical component is autoconf.
- Once that is running, os dependent interfaces and the SCSI library should be
- adjusted. For the makefile system and the scsi library please contact Joerg
- Schilling.
- Q: Cdda2wav sucks. Are there other alternatives available?
- A: Yes, for Linux you might try 'cdparanoia' from Monty (see README file).