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

MIDI and SoundFont2/DLS library with no compromises

import { IndexedByteArray } from "../../../utils/indexed_array.js";
import { writeDword, writeWord } from "../../../utils/byte_functions/little_endian.js";
import { writeRIFFChunkParts, writeRIFFChunkRaw } from "../riff_chunk.js";
import { writeWavesample } from "./wsmp.js";
import { SpessaSynthInfo } from "../../../utils/loggin.js";
import { consoleColors } from "../../../utils/other.js";
import { getStringBytes } from "../../../utils/byte_functions/string.js";

/**
 * @param sample {BasicSample}
 * @returns {IndexedByteArray}
 */
export function writeDLSSample(sample)
{
    const fmtData = new IndexedByteArray(18);
    writeWord(fmtData, 1); // wFormatTag
    writeWord(fmtData, 1); // wChannels
    writeDword(fmtData, sample.sampleRate);
    writeDword(fmtData, sample.sampleRate * 2); // 16-bit samples
    writeWord(fmtData, 2); // wBlockAlign
    writeWord(fmtData, 16); // wBitsPerSample
    const fmt = writeRIFFChunkRaw(
        "fmt ",
        fmtData
    );
    let loop = 1;
    if (sample.sampleLoopStartIndex + Math.abs(sample.getAudioData().length - sample.sampleLoopEndIndex) < 2)
    {
        loop = 0;
    }
    const wsmp = writeWavesample(
        sample,
        sample.samplePitch,
        sample.samplePitchCorrection,
        0,
        sample.sampleLoopStartIndex,
        sample.sampleLoopEndIndex,
        loop
    );
    let data = writeRIFFChunkRaw(
        "data",
        sample.getRawData(false) // no vorbis allowed
    );
    
    const inam = writeRIFFChunkRaw(
        "INAM",
        getStringBytes(sample.sampleName, true)
    );
    const info = writeRIFFChunkRaw(
        "INFO",
        inam,
        false,
        true
    );
    SpessaSynthInfo(
        `%cSaved %c${sample.sampleName}%c succesfully!`,
        consoleColors.recognized,
        consoleColors.value,
        consoleColors.recognized
    );
    return writeRIFFChunkParts(
        "wave",
        [
            fmt,
            wsmp,
            data,
            info
        ],
        true
    );
}