On Mon, 25 Nov 2002 14:11:14 -0500, Hubert Chan <[EMAIL PROTECTED]> wrote:
>>>>>> "Vineet" == Vineet Kumar <[EMAIL PROTECTED]> writes: > >Vineet> * Bill Moseley ([EMAIL PROTECTED]) [021125 06:51]: >>> Is there any way to emulate a cdrom device? Granted CDRs are >>> inexpensive, but I was wondering if there was a way to "burn" a cd to >>> a file for testing and they play it like an audio CD. > >Vineet> You won't be able to play it like an audio CD. When your CD-ROM >Vineet> drive does this, it does it at a much lower level; the OS just >Vineet> gives it cd-player-style commands like "play" "stop" "skip", >Vineet> etc, rather than reading the bits of music and feeding them to >Vineet> the soundcard. The CD-ROM is connected directly to the >Vineet> soundcard and just spews the music over there without processing >Vineet> it at all. So until you put the music under the laser, you >Vineet> won't be able to test it "like and audio CD." > >Some CD players, e.g. alsaplayer and the xmms-cdread plugin, read the >digital audio from the disk, and dump it to the sound card. This lets >alsaplayer do funky stuff, like playback at double speed for the >Chipmunks version, or playing the CD backwards to check if your band has >been inserting subliminal messages (YVAN EHT NIOJ). But they might >still use CD-specific ioctl's, which would prevent them from working on >plain files. It is possible to read the music files on a CD digitally and pass them to the soundcard. I am sure of this because I don't have an analogue cable to connect either CD drive to the soundcard, but I can still play CDs. I have used sox from the console - not very often; I usually play CDs on my hi-fi. I can't remember whether sox can read the CD directly or whether I had to pipe the output from cdda2wav to sox; I think the latter. I don't see why this shouldn't work with a loopback-mounted ISO image - as per Sean's suggestion - if I understand correctly, the loopback mounting system is transparent, so whatever is reading the loopback-mounted image sees it as a normal CD drive, and any CD-specific ioctls are handled correctly. I haven't actually tried this; I'm ashamed to confess I use Cool Edit in Windoze for what you're trying to do. The quick fudge option would be to burn the music to a CD-RW, and play it using the play button on your CD drive, cos your hi-fi's CD player won't read CD-RWs (AARGH). -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
