1 The Road Trip and Burning Speex files to audio CDs {anchor:The Road Trip and Burning Speex files to audio CDs} Today, I'm going on a road trip, and I would like to listen to something interesting while driving. In an earlier post, [2004-02-20#My_new_Radio_VCR], I described a "VCR" that I created to record radio shows. Why not listen to some of the recorded shows while on the road? The Radio VCR saves the shows in Speex format, but my car's audio system, like most, can handle only plain-old audio CDs. Thus I needed to burn a few CDs from my {link:Speex|http://www.speex.org} files. It's a three step process: 1. Decode Speex format into raw, 16 kHz audio. 1. "Upsample" the 16 kHz audio into CD-ready 44.1 kHz audio. 1. Burn the 44.1 kHz audio to a CD. It sounds simple, and it is – once you figure out all the proper speexdec, sox, and cdrecord settings. To save you the trouble, here's the script I wrote to automate the process: {code:none} \#!/bin/bash \# \# $Id: burn-speex,v 1.3 2004/03/20 15:58:02 thor Exp $ \# TGM 2004-03-20 \# \# Usage: burn-speex file.spx \# configuration cddevice=3,0,0 speed=8 \# parse arguments file="$1" shift \# preflight checks [ -z "$file" ] && { echo "Usage: burn-speex input.spx"; exit 1; } [ -f "$file" ] || { echo "No such file: $file"; exit 2; } [ $(id -u) = 0 ] || { echo 'You must be root to burn a CD. (Use sudo?)'; exit 3; } \# create temp file to hold WAV file tmp=$(mktemp \/tmp\/burn\-speex\-\XX\XX\XX) mv "$tmp" "$tmp.wav" tmp="$tmp.wav" \# make sure the temp file is cleaned up cleanup() { rm -f "$tmp"; } trap cleanup 1 2 3 5 13 15 \# transcode the speex file into 44.1 kHz WAV file echo echo "Transcoding speex file $file into 44.1 kHz WAV format..." echo speexdec --stereo "$file" - | sox -t raw -r 16000 -c 2 -sw - -r 44100 -t wav - resample > "$tmp" \# burn the WAV file echo echo "Burning CD..." echo cdrecord -v -pad -audio -eject speed=$speed dev=$cddevice "$tmp" \# clean up and exit cleanup echo echo Done. exit 0 {code} 2004-04-22 03:00:48.172 2004-03-20 11:20:49.294