spessasynth_core/src/soundfont/basic_soundfont/write_dls/ins.js

MIDI and SoundFont2/DLS library with no compromises

import { IndexedByteArray } from "../../../utils/indexed_array.js";
import { combineZones } from "./combine_zones.js";
import { writeRIFFChunkParts, writeRIFFChunkRaw } from "../riff_chunk.js";
import { writeDword } from "../../../utils/byte_functions/little_endian.js";
import { writeDLSRegion } from "./rgn2.js";
import { writeArticulator } from "./art2.js";
import { SpessaSynthGroupCollapsed, SpessaSynthGroupEnd } from "../../../utils/loggin.js";
import { consoleColors } from "../../../utils/other.js";
import { getStringBytes } from "../../../utils/byte_functions/string.js";

/**
 * @this {BasicSoundBank}
 * @param preset {BasicPreset}
 * @returns {IndexedByteArray}
 */
export function writeIns(preset)
{
    SpessaSynthGroupCollapsed(
        `%cWriting %c${preset.presetName}%c...`,
        consoleColors.info,
        consoleColors.recognized,
        consoleColors.info
    );
    // combine preset and instrument zones into a single instrument zone (region) list
    const inst = combineZones(preset);
    const global = inst.globalZone;
    const zones = inst.instrumentZones;
    
    
    // insh: instrument header
    const inshData = new IndexedByteArray(12);
    writeDword(inshData, zones.length); // cRegions
    // bank MSB is in bits 8-14
    let ulBank = (preset.bank & 127) << 8;
    // bit 32 means drums
    if (preset.bank === 128)
    {
        ulBank |= (1 << 31);
    }
    writeDword(inshData, ulBank);                     // ulBank
    writeDword(inshData, preset.program & 127); // ulInstrument
    
    const insh = writeRIFFChunkRaw(
        "insh",
        inshData
    );
    
    // write global zone
    const art2 = writeArticulator(global);
    let lar2 = writeRIFFChunkRaw(
        "lar2",
        art2,
        false,
        true
    );
    
    // write the region list
    const lrgn = writeRIFFChunkParts(
        "lrgn",
        zones.reduce((arrs, z) =>
        {
            arrs.push(writeDLSRegion.apply(this, [z, global]));
            return arrs;
        }, []),
        true
    );
    
    // writeINFO
    const inam = writeRIFFChunkRaw(
        "INAM",
        getStringBytes(preset.presetName, true)
    );
    const info = writeRIFFChunkRaw(
        "INFO",
        inam,
        false,
        true
    );
    
    SpessaSynthGroupEnd();
    return writeRIFFChunkParts(
        "ins ", [insh, lrgn, lar2, info],
        true
    );
}