feature request: making sfizz_render support program changes and renders all 16 midi channels to mix them into one wav file

[michael02022]

I modified the code to support program changes and set a specific midi channel to render, so I render the 16 channels as WAV and then mix them with SOX. Theorically can be done entirely through the code but I don't have the enough C++ skill for it. And we could add for percussion set (channel 10) a specific SFZ file for it in args.

Here my modified code as an example and the result:

sfizz_render_example.zip

[kmturley]

Diff of @michael02022 sfizz_render.cpp vs current

and additional bash script example posted in Discord (so it doesn't get lost)

#!/bin/bash

sfizz_render="/mnt/1Terita/sfizz-ui/build/library/bin/sfizz_render"
bank="/mnt/1Terita/SFZ Banks/SFZGM500/SFZGM500.sfz"
perc=""
no_perc=0

mkdir -p ./tmp

# Loop de 1 a 16
for i in {1..9}
do
    echo "Rendering $i..."
    $sfizz_render --midi "$1" --channel "$i" --wav "./tmp/file_$i.wav" --sfz "$bank"
done

# channel 10
echo "Rendering 10..."
if ! $sfizz_render --midi "$1" --channel 10 --wav "./tmp/file_10.wav" --sfz "$perc"; then
  no_perc=1
fi

for i in {11..16}
do
    echo "Rendering $i..."
    $sfizz_render --midi "$1" --channel "$i" --wav "./tmp/file_$i.wav" --sfz "$bank"
done

if [ "$no_perc" -eq 1 ]; then
  sox -m ./tmp/file_1.wav ./tmp/file_2.wav ./tmp/file_3.wav ./tmp/file_4.wav ./tmp/file_5.wav ./tmp/file_6.wav ./tmp/file_7.wav ./tmp/file_8.wav ./tmp/file_9.wav ./tmp/file_11.wav ./tmp/file_12.wav ./tmp/file_13.wav ./tmp/file_14.wav ./tmp/file_15.wav ./tmp/file_16.wav "./tmp/${1%.*}_beta.wav"
else
  sox -m ./tmp/file_1.wav ./tmp/file_2.wav ./tmp/file_3.wav ./tmp/file_4.wav ./tmp/file_5.wav ./tmp/file_6.wav ./tmp/file_7.wav ./tmp/file_8.wav ./tmp/file_9.wav ./tmp/file_10.wav ./tmp/file_11.wav ./tmp/file_12.wav ./tmp/file_13.wav ./tmp/file_14.wav ./tmp/file_15.wav ./tmp/file_16.wav "./tmp/${1%.*}_beta.wav"
fi

sox "./tmp/${1%.*}_beta.wav" "./${1%.*}.wav" norm

rm -rf ./tmp