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April 23, 2024 06:25
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MQA ilke encoder/decoder using steghide, ffmpeg and sox
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#!/bin/bash | |
bfn=foo | |
codec=flac | |
hz=48000 | |
#hz=44100 | |
thz=24000 | |
#thz=22050 | |
workdir=work_dec | |
sfn=${bfn}_${thz}_steg.wav | |
ifn=$workdir/${bfn}_$hz.wav | |
tfn=${bfn}_$hz.$codec | |
loglevel="-loglevel quiet" | |
mkdir -p $workdir | |
# ステガノグラフィを解く | |
diffcodec=opus | |
rm -f $workdir/diff.$diffcodec | |
steghide extract -p '' -sf $sfn -xf $workdir/diff.$diffcodec | |
# サンプリング周波数を復元する | |
ffmpeg -hide_banner $loglevel -i $sfn -acodec pcm_s24le -ar $hz $ifn -y | |
# ミックスする | |
ffmpeg -hide_banner $loglevel -i $workdir/diff.$diffcodec $workdir/diff.flac -y | |
sox -m -v 1 $ifn -v 1 $workdir/diff.flac $tfn |
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#!/bin/bash | |
bfn=foo | |
codec=wav | |
fn=$bfn.flac | |
hz=48000 | |
#hz=44100 | |
thz=24000 | |
#thz=22050 | |
workdir=work_enc | |
tfn=$workdir/${bfn}_$thz.wav | |
sfn=${bfn}_${thz}_steg.wav | |
ifn=$workdir/${bfn}_$hz.$codec | |
loglevel="-loglevel quiet" | |
mkdir -p $workdir | |
# サンプリング周波数を半分にする | |
ffmpeg -hide_banner $loglevel -i $fn -acodec pcm_s16le -ar $thz $tfn -y | |
#ffprobe -hide_banner $tfn | |
# サンプリング周波数を復元する | |
ffmpeg -hide_banner $loglevel -i $tfn -acodec pcm_s24le -ar $hz $ifn -y | |
# 符号反転しミックスして差分を作成する | |
sox -v -1 $ifn $workdir/neg.$codec | |
sox -m -v 1 $fn -v 1 $workdir/neg.$codec $workdir/diff.$codec | |
# 差分を不可逆圧縮する | |
diffcodec=opus | |
ffmpeg -hide_banner $loglevel -i $workdir/diff.$codec -ab 16K \ | |
$workdir/diff.$diffcodec -y | |
# ステガノグラフィにする | |
rm -f $sfn | |
steghide embed -p '' -Z -N -K -e none -ef $workdir/diff.$diffcodec -cf $tfn \ | |
-sf $sfn |
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