MicroDexed/addon/tools/wav2c.sh

#!/bin/bash
#
# Converter for WAV to C Header
# Used for MicroDexed sampler
#
# (c) 2021 Holger Wirtz
#

SOX=`which sox`
XXD=`which xxd`
TMP="/tmp/wav2c"
AUDIO_BLOCK_SIZE=128
DRUMSET_H="drumset.h"
DRUMS_H="drums.h"

function cleanexit()
{
	#rm -rf "${TMP}"
	echo -n ""
}

trap cleanexit EXIT

if [ -z "${SOX}" ]
then
	echo "Cannot find 'sox' in your PATH." >&2
	exit 100
fi

if [ -z "${XXD}" ]
then
	echo "Cannot find 'xxd' in your PATH." >&2
	exit 101
fi

POSITIONAL=()
while [[ $# -gt 0 ]]; do
  key="$1"

  case $key in
    -c|--config)
      CONFIG="$2"
      shift # past argument
      shift # past value
      ;;
    -w|--wavs)
      WAV_DIR="$2"
      shift # past argument
      shift # past value
      ;;
#    -t|--test)
#      TEST="true"
#      shift # past argument
#      ;;
    *)    # unknown option
      POSITIONAL+=("$1") # save it in an array for later
      shift # past argument
      ;;
  esac
done

if [ ! -f "${CONFIG}" ]
then
	echo "Cannot find configuration file." >&2
	exit 200
fi

if [ ! -d "${WAV_DIR}" ]
then
	echo "Cannot find folder for WAV files." >&2
	exit 201
fi

if (( `ls "${WAV_DIR}" | wc -l` == 0 ))
then
	echo "Cannot find any file in ${WAV_DIR}." >&2
	exit 202
fi

mkdir -p "${TMP}"
echo "#pragma once" >"${DRUMSET_H}"
rm -f "${DRUMS_H}"
cat >> "${DRUMS_H}" << EOF
/*
   MicroDexed

   MicroDexed is a port of the Dexed sound engine
   Dexed ist heavily based on https://github.com/google/music-synthesizer-for-an
droid

   (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>

   Permission is hereby granted, free of charge, to any person obtaining a copy
   of this software and associated documentation files (the "Software"), to deal
   in the Software without restriction, including without limitation the rights
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   copies of the Software, and to permit persons to whom the Software is
   furnished to do so, subject to the following conditions:

   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   THE SOFTWARE.
*/

#include <Arduino.h>
#include "config.h"
#include "drumset.h"

#ifndef _DRUMS_H
#define _DRUMS_H

typedef struct drum_config_s {
  uint8_t drum_class; // Type of drum
  uint8_t midinote;   // Triggered by note
  char name[DRUM_NAME_LEN];
  const uint8_t* drum_data;
  char shortname[2];  // 1 char name for sequencer
  uint32_t len;       // number of elements in drum_data
  float32_t pitch;    //
  float32_t pan;      // Panorama (-1.0 - +1.0)
  float32_t vol_max;  // max. Volume (0.0 - 1.0)
  float32_t vol_min;  // min. Volume (0.0 - 1.0, should be <= vol_max)
  float32_t reverb_send; // how much signal to send to the reverb (0.0 - 1.0)
} drum_config_t;

enum {DRUM_NONE, DRUM_BASS, DRUM_SNARE, DRUM_HIHAT, DRUM_HANDCLAP, DRUM_RIDE, DRUM_CHRASH, DRUM_LOWTOM, DRUM_MIDTOM, DRUM_HIGHTOM, DRUM_PERCUSSION};

// DEFAULT MIDI CHANNEL FOR SAMPLEDRUMS
uint8_t drum_midi_channel = 10;

drum_config_t drum_config[NUM_DRUMSET_CONFIG] =
{
EOF

declare -A converted_files

while IFS= read -r l
do
	declare -A sample
	
	if [[ "${l:0:1}" == "#" ]]
	then
		continue
	fi
	IFS=',' read -ra samplecfg <<< "${l}"

	sample['class']=`echo "${samplecfg[0]}" | xargs`
	sample['midinote']=`echo "${samplecfg[1]}" | xargs`
	sample['name']=`echo "${samplecfg[2]}" | xargs`
	sample['data_name']="${sample['name']}"
	sample['shortname']=`echo "${samplecfg[3]}" | xargs`
	sample['pitch']=`echo "${samplecfg[4]}" | xargs`
	sample['pan']=`echo "${samplecfg[5]}" | xargs`
	sample['vol_max']=`echo "${samplecfg[6]}" | xargs`
	sample['vol_min']=`echo "${samplecfg[7]}" | xargs`
	sample['reverb_send']=`echo "${samplecfg[8]}" | xargs`
	sample['filename']=`echo "${samplecfg[9]}" | xargs`

	if [ -f "${WAV_DIR}/${sample['filename']}" ]
	then
		file "${WAV_DIR}/${sample['filename']}" | grep -i -q "WAVE audio"
		if [ "${?}" == 0 ]
		then
			# Generate drumset.h

			if [ -z "${converted_files[${sample['filename']}]}" ]
			then
				basename=`echo "${sample['filename']}" | cut -d'.' -f1`
        			sox "${WAV_DIR}/${sample['filename']}" -c 1 -b 16 -L "${TMP}/${basename}.raw"
				xxd -i "${TMP}/${basename}.raw" > "${TMP}/${basename}.h"
				sample['len']=`grep "^unsigned int" "${TMP}/${basename}.h" | cut -d"=" -f2 | sed 's/\s*\([0-9]\+\);/\1/'`
				fill_mod=`expr "${sample['len']}" % "${AUDIO_BLOCK_SIZE}"`
				fill=`expr "${AUDIO_BLOCK_SIZE}" - "${fill_mod}"`
				sample['len']=`expr "${sample['len']}" + "${fill}"`
				sample['len']=`expr "${sample['len']}" / 2`

				echo "// Converted from ${sample['filename']}, length = ${sample['len']} bytes" >> "${DRUMSET_H}"
				echo "PROGMEM const uint8_t ${sample['name']}[] = {" >> "${DRUMSET_H}"
				grep "^ " "${TMP}/${basename}.h" >> "${DRUMSET_H}"

				if (( "${fill}" > 0 ))
				then
					echo -n "," >> "${DRUMSET_H}"
					fill_counter=0
					for i in $(seq 1 "${fill}")
					do
						echo -n "0x00" >> "${DRUMSET_H}"
						let fill_counter+=1
						if (( "${fill_counter}" >= 8 ))
						then
							echo "," >> "${DRUMSET_H}"
							fill_counter=0
						else
							echo -n ", " >> "${DRUMSET_H}"
						fi
					done
				fi
				echo "};" >> "${DRUMSET_H}"

				converted_files["${sample['filename']}"]="${sample['name']},${sample['len']}"
			else
				sample['data_name']=`echo ${converted_files[${sample['filename']}]} | cut -d"," -f1`
				sample['len']=`echo ${converted_files[${sample['filename']}]} | cut -d"," -f2`
			fi	

			# Generate drums.h
			cat >> "${DRUMS_H}" << EOF
  {
    ${sample[class]},
    ${sample[midinote]},
    "${sample[name]}",
    ${sample[data_name]},
    "${sample[shortname]}",
    ${sample[len]},
    ${sample[pitch]},
    ${sample[pan]},
    ${sample[vol_max]},
    ${sample[vol_min]},
    ${sample[reverb_send]}
  },
EOF
		fi
	else
		echo "File \'${WAV_DIR}/${sample['filename']}\' does not exits." >&2
	fi
done < "${CONFIG}"

cat >> "${DRUMS_H}" << EOF
  {
    DRUM_NONE,
    0,
    "EMPTY",
    NULL,
    "-",
    0,
    0.0,
    0.0,
    0.0,
    0.0,
    0.0
  }
};

#endif
EOF