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import { pipeline, TextToAudioPipeline } from "@huggingface/transformers";
import { split } from "./splitter";
import type { RawAudio } from "@huggingface/transformers";
const MODEL_ID = "onnx-community/Supertonic-TTS-ONNX";
const VOICES_URL = `https://huggingface.co/${MODEL_ID}/resolve/main/voices/`;
let pipelinePromise: Promise<TextToAudioPipeline> | null = null;
let embeddingsPromise: Promise<Record<string, Float32Array>> | null = null;
export async function loadPipeline(progressCallback: (info: any) => void) {
return pipelinePromise ??= (async () => {
// @ts-ignore
const tts = (await pipeline("text-to-speech", MODEL_ID, {
device: "webgpu",
progress_callback: progressCallback,
})) as TextToAudioPipeline;
// Warm up the model to compile shaders
await tts("Hello", {
speaker_embeddings: new Float32Array(1 * 101 * 128), // Dummy embedding
num_inference_steps: 1,
speed: 1.0,
});
return tts;
})();
}
export async function loadEmbeddings() {
return (embeddingsPromise ??= (async () => {
const [female, male] = await Promise.all([
fetch(`${VOICES_URL}F1.bin`).then((r) => r.arrayBuffer()),
fetch(`${VOICES_URL}M1.bin`).then((r) => r.arrayBuffer()),
]);
return {
Female: new Float32Array(female),
Male: new Float32Array(male),
};
})());
}
export interface StreamResult {
time: number;
audio: RawAudio;
text: string;
index: number;
total: number;
}
function splitWithConstraints(text: string, { minCharacters = 1, maxCharacters = Infinity } = {}): string[] {
if (!text) return [];
const rawLines = split(text);
const result: string[] = [];
let currentBuffer = "";
for (const rawLine of rawLines) {
const line = rawLine.trim();
if (!line) continue;
if (line.length > maxCharacters) {
throw new Error(`A single segment exceeds the maximum character limit of ${maxCharacters} characters.`);
}
if (currentBuffer) currentBuffer += " ";
currentBuffer += line;
while (currentBuffer.length > maxCharacters) {
result.push(currentBuffer.slice(0, maxCharacters));
currentBuffer = currentBuffer.slice(maxCharacters);
}
if (currentBuffer.length >= minCharacters) {
result.push(currentBuffer);
currentBuffer = "";
}
}
if (currentBuffer) result.push(currentBuffer);
return result;
}
export async function* streamTTS(
text: string,
tts: TextToAudioPipeline,
speaker_embeddings: Float32Array,
quality: number,
speed: number,
): AsyncGenerator<StreamResult> {
const chunks = splitWithConstraints(text, {
minCharacters: 100,
maxCharacters: 1000,
});
if (chunks.length === 0) chunks.push(text);
for (let i = 0; i < chunks.length; ++i) {
const chunk = chunks[i];
if (!chunk.trim()) continue;
const output = (await tts(chunk, {
speaker_embeddings,
num_inference_steps: quality,
speed,
})) as RawAudio;
if (i < chunks.length - 1) {
// Add 0.5s silence between chunks for more natural flow
const silenceSamples = Math.floor(0.5 * output.sampling_rate);
const padded = new Float32Array(output.audio.length + silenceSamples);
padded.set(output.audio);
output.audio = padded;
}
yield {
time: performance.now(),
audio: output,
text: chunk,
index: i + 1,
total: chunks.length,
};
}
}
export function createAudioBlob(chunks: Float32Array[], sampling_rate: number): Blob {
const totalLength = chunks.reduce((acc, chunk) => acc + chunk.length, 0);
// Create WAV header
const buffer = new ArrayBuffer(44);
const view = new DataView(buffer);
// RIFF chunk descriptor
writeString(view, 0, "RIFF");
view.setUint32(4, 36 + totalLength * 4, true); // ChunkSize
writeString(view, 8, "WAVE");
// fmt sub-chunk
writeString(view, 12, "fmt ");
view.setUint32(16, 16, true); // Subchunk1Size
view.setUint16(20, 3, true); // AudioFormat (3 = IEEE Float)
view.setUint16(22, 1, true); // NumChannels (Mono)
view.setUint32(24, sampling_rate, true); // SampleRate
view.setUint32(28, sampling_rate * 4, true); // ByteRate
view.setUint16(32, 4, true); // BlockAlign
view.setUint16(34, 32, true); // BitsPerSample
// data sub-chunk
writeString(view, 36, "data");
view.setUint32(40, totalLength * 4, true); // Subchunk2Size
return new Blob([buffer, ...chunks as any], { type: "audio/wav" });
}
function writeString(view: DataView, offset: number, string: string) {
for (let i = 0; i < string.length; i++) {
view.setUint8(offset + i, string.charCodeAt(i));
}
}
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