Date: Wed, 1 Dec 1999 13:56:23 +1100 (EST) From: Warren Toomey <wkt@cs.adfa.edu.au> To: freebsd-multimedia@freebsd.org Subject: Help ioctl()ing /dev/audio Message-ID: <199912010256.NAA06269@henry.cs.adfa.edu.au>
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Hi all, I've just joined the multimedia list, but have searched/browsed thru the back-issues to find an answer with no luck. I want to encode 16-bit mono/stereo audio (at different samplerates) on the fly using Lame (http://www.sulaco.org/mp3/). Lame can read raw PCM data from standard input and save as an MP3 file. However, running lame [options] < /dev/audio isn't going to work, because I'll need to issue the correct ioctls to the sound device. I'm thinking of writing a front-end C program which does: - reads cmd-line args, works out sound format required - opens /dev/audio - issues appropriate ioctl()s to /dev/audio - closes file descriptor 0 - dup2()s /dev/audio down to file descriptor 0 - closes /dev/audio - execs Lame with the original cmd-line args However, I'm having a damn hard time trying to find the correct ioctls to issue to /dev/audio, or even if I should be using /dev/dsp instead. I'm running FreeBSD-3.2 with the following kernel options: # css: Crystal Sound System (CSS 423x PnP) controller snd0 device css0 at isa? port 0x534 irq 5 drq 1 flags 0x08 vector adintr and the device works fine. Could somebody point me at the right place to find the right ioctls to set up: sample rate, stereo/mono etc. I've found machine/sound.h to be extremely confusing. Many thanks in advance! Warren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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