spessasynth_lib
Version:
MIDI and SoundFont2/DLS library with no compromises
80 lines (77 loc) • 2.63 kB
JavaScript
import { RiffChunk, writeRIFFChunk } from "../riff_chunk.js";
import { IndexedByteArray } from "../../../utils/indexed_array.js";
import { SpessaSynthInfo } from "../../../utils/loggin.js";
import { consoleColors } from "../../../utils/other.js";
/**
* @this {BasicSoundBank}
* @param smplStartOffsets {number[]}
* @param smplEndOffsets {number[]}
* @param compress {boolean}
* @param quality {number}
* @param vorbisFunc {EncodeVorbisFunction}
* @returns {IndexedByteArray}
*/
export function getSDTA(smplStartOffsets, smplEndOffsets, compress, quality, vorbisFunc)
{
// write smpl: write int16 data of each sample linearly
// get size (calling getAudioData twice doesn't matter since it gets cached)
const sampleDatas = this.samples.map((s, i) =>
{
if (compress)
{
s.compressSample(quality, vorbisFunc);
}
const r = s.getRawData();
SpessaSynthInfo(
`%cEncoded sample %c${i}. ${s.sampleName}%c of %c${this.samples.length}%c. Compressed: %c${s.isCompressed}%c.`,
consoleColors.info,
consoleColors.recognized,
consoleColors.info,
consoleColors.recognized,
consoleColors.info,
s.isCompressed ? consoleColors.recognized : consoleColors.unrecognized,
consoleColors.info
);
return r;
});
const smplSize = this.samples.reduce((total, s, i) =>
{
return total + sampleDatas[i].length + 46;
}, 0);
const smplData = new IndexedByteArray(smplSize);
// resample to int16 and write out
this.samples.forEach((sample, i) =>
{
const data = sampleDatas[i];
let startOffset;
let endOffset;
let jump = data.length;
if (sample.isCompressed)
{
// sf3 offset is in bytes
startOffset = smplData.currentIndex;
endOffset = startOffset + data.length;
}
else
{
// sf2 in sample data points
startOffset = smplData.currentIndex / 2;
endOffset = startOffset + data.length / 2;
jump += 46;
}
smplStartOffsets.push(startOffset);
smplData.set(data, smplData.currentIndex);
smplData.currentIndex += jump;
smplEndOffsets.push(endOffset);
});
const smplChunk = writeRIFFChunk(new RiffChunk(
"smpl",
smplData.length,
smplData
), new IndexedByteArray([115, 100, 116, 97])); // `sdta`
return writeRIFFChunk(new RiffChunk(
"LIST",
smplChunk.length,
smplChunk
));
}