forked from sox_ng/sox_ng
2d3812aa78
This is the hard fork, allowing old sox and sox_ng to coexist on the same system. Any distro wishing to switch to sox_ng just needs to make symlinks from the old file names to the new. This also removes the Debian-specific files rather than trying to update them, as Debian uses its own version of them.
143 lines
4.9 KiB
Bash
Executable file
143 lines
4.9 KiB
Bash
Executable file
#!/bin/bash
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#
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# crossfade.sh
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#
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# Creates two new files that when played together have a crossfade
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# of $1 seconds. This means that $1/2 of the crossfade is in
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# the 1st file and $1/2 in the second file. Can be used to
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# make audio CD's with a 0 second pregap between songs to
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# have one song flow into the next; yet still be able to skip
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# around the CD with minimal loss of song.
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#
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# Filenames are specified as $2 and $3.
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#
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# $4 is optional and specifies if a fadeout should be performed on
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# first file. Can be yes/no/auto.
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# $5 is optional and specifies if a fadein should be performed on
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# second file. Can be yes/no/auto
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#
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# Example: $0 10 infile1.wav infile2.wav auto auto
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#
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# By default, the script attempts to guess if the audio files
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# already have a fadein/out on them or if they just have really
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# low volumes that won't cause clipping when mixxing. If this
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# is not detected then the script will perform a fade in/out to
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# prevent clipping.
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#
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# The user may specify "yes" or "no" to force the fade in/out
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# to occur. They can also specify "auto" which is the default.
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#
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# Crossfaded file $2 is prepended with cfo_ and $3 is prepended
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# with cfi_.
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#
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# Original script from Kester Clegg. Mods by Chris Bagwell to show
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# more examples of sox features.
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#
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SOX=../src/sox_ng
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if [ "$3" == "" ]; then
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echo "Usage: $0 crossfade_seconds first_file second_file [ fadeout ] [ fadein ]"
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echo
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echo "If a fadeout or fadein is not desired then specify \"no\" for that option. \"yes\" will force a fade and \"auto\" will try to detect if a fade should occur."
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echo
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echo "Example: $0 10 infile1.wav infile2.wav auto auto"
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exit 1
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fi
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fade_length=$1
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first_file=$2
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second_file=$3
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fade_first="auto"
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if [ "$4" != "" ]; then
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fade_first=$4
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fi
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fade_second="auto"
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if [ "$5" != "" ]; then
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fade_second=$5
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fi
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fade_first_opts=
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if [ "$fade_first" != "no" ]; then
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fade_first_opts="fade t 0 0:0:$fade_length 0:0:$fade_length"
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fi
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fade_second_opts=
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if [ "$fade_second" != "no" ]; then
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fade_second_opts="fade t 0:0:$fade_length"
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fi
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echo "crossfade and concatenate files"
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echo
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echo "Finding length of $first_file..."
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first_length=`$SOX --info -D "$first_file"`
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echo "Length is $first_length seconds"
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trim_length=`echo "$first_length - $fade_length" | bc`
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crossfade_split_length=`echo "scale=2; $fade_length / 2.0" | bc`
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# Get crossfade section from first file and optionally do the fade out
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echo "Obtaining $fade_length seconds of fade out portion from $first_file..."
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$SOX "$first_file" -e signed-integer -b 16 fadeout1.wav trim $trim_length $fade_first_opts
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# When user specifies "auto" try to guess if a fadeout is needed.
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# "RMS amplitude" from the stat effect is effectively an average
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# value of samples for the whole fade length file. If it seems
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# quiet then assume a fadeout has already been done. An RMS value
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# of 0.1 was just obtained from trial and error.
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if [ "$fade_first" == "auto" ]; then
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RMS=`$SOX fadeout1.wav 2>&1 -n stat | grep RMS | grep amplitude | cut -d : -f 2 | cut -f 1`
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should_fade=`echo "$RMS > 0.1" | bc`
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if [ $should_fade == 0 ]; then
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echo "Auto mode decided not to fadeout with RMS of $RMS"
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fade_first_opts=""
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else
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echo "Auto mode will fadeout"
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fi
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fi
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$SOX fadeout1.wav fadeout2.wav $fade_first_opts
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# Get the crossfade section from the second file and optionally do the fade in
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echo "Obtaining $fade_length seconds of fade in portion from $second_file..."
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$SOX "$second_file" -e signed-integer -b 16 fadein1.wav trim 0 $fade_length
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# For auto, do similar thing as for fadeout.
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if [ "$fade_second" == "auto" ]; then
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RMS=`$SOX fadein1.wav 2>&1 -n stat | grep RMS | grep amplitude | cut -d : -f 2 | cut -f 1`
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should_fade=`echo "$RMS > 0.1" | bc`
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if [ $should_fade == 0 ]; then
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echo "Auto mode decided not to fadein with RMS of $RMS"
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fade_second_opts=""
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else
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echo "Auto mode will fadein"
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fi
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fi
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$SOX fadein1.wav fadein2.wav $fade_second_opts
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# Mix the crossfade files together at full volume
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echo "Crossfading..."
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$SOX -m -v 1.0 fadeout2.wav -v 1.0 fadein2.wav crossfade.wav
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echo "Spliting crossfade into $crossfade_split_length lengths"
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$SOX crossfade.wav crossfade1.wav trim 0 $crossfade_split_length
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$SOX crossfade.wav crossfade2.wav trim $crossfade_split_length
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echo "Trimming off crossfade sections from original files..."
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$SOX "$first_file" -e signed-integer -b 16 song1.wav trim 0 $trim_length
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$SOX "$second_file" -e signed-integer -b 16 song2.wav trim $fade_length
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echo "Creating crossfade files"
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$SOX song1.wav crossfade1.wav "cfo_${first_file}.wav"
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$SOX crossfade2.wav song2.wav "cfi_${second_file}.wav"
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echo -e "Removing temporary files...\n"
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rm fadeout1.wav fadeout2.wav fadein1.wav fadein2.wav crossfade.wav crossfade1.wav crossfade2.wav song1.wav song2.wav
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mins=`echo "$trim_length / 60" | bc`
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secs=`echo "$trim_length % 60" | bc`
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echo "The crossfade occurs at around $mins mins $secs secs in $first_file"
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