146 lines
4.5 KiB
TypeScript
146 lines
4.5 KiB
TypeScript
import { beforeEach, describe, expect, it, vi } from 'vitest'
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import { synthesizeWithBailianTTS } from '@/lib/providers/bailian/tts'
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function buildWavBuffer(durationMs: number): Buffer {
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const sampleRate = 8000
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const channels = 1
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const bitsPerSample = 16
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const byteRate = sampleRate * channels * (bitsPerSample / 8)
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const dataLength = Math.round((durationMs / 1000) * byteRate)
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const pcmData = Buffer.alloc(dataLength, 0)
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const output = Buffer.alloc(44 + dataLength)
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output.write('RIFF', 0, 'ascii')
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output.writeUInt32LE(36 + dataLength, 4)
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output.write('WAVE', 8, 'ascii')
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output.write('fmt ', 12, 'ascii')
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output.writeUInt32LE(16, 16)
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output.writeUInt16LE(1, 20)
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output.writeUInt16LE(channels, 22)
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output.writeUInt32LE(sampleRate, 24)
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output.writeUInt32LE(byteRate, 28)
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output.writeUInt16LE(channels * (bitsPerSample / 8), 32)
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output.writeUInt16LE(bitsPerSample, 34)
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output.write('data', 36, 'ascii')
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output.writeUInt32LE(dataLength, 40)
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pcmData.copy(output, 44)
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return output
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}
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describe('bailian tts synthesis', () => {
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beforeEach(() => {
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vi.restoreAllMocks()
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})
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it('synthesizes one segment and returns wav buffer', async () => {
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const wav = buildWavBuffer(120)
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const fetchMock = vi.fn(async (input: string) => {
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if (input.includes('/multimodal-generation/generation')) {
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return {
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ok: true,
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text: async () => JSON.stringify({
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output: {
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audio: {
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url: 'https://audio.example/segment-1.wav',
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},
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},
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usage: { characters: 10 },
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request_id: 'req-1',
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}),
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}
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}
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if (input === 'https://audio.example/segment-1.wav') {
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return {
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ok: true,
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status: 200,
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arrayBuffer: async () => wav.buffer.slice(wav.byteOffset, wav.byteOffset + wav.byteLength),
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}
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}
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throw new Error(`unexpected fetch url: ${input}`)
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})
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vi.stubGlobal('fetch', fetchMock as unknown as typeof fetch)
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const result = await synthesizeWithBailianTTS({
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text: '你好，世界',
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voiceId: 'voice_1',
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}, 'bl-key')
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expect(result.success).toBe(true)
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expect(result.audioData).toBeDefined()
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expect(result.audioDuration).toBe(120)
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expect(result.audioUrl).toBe('https://audio.example/segment-1.wav')
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expect(result.characters).toBe(10)
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expect(fetchMock).toHaveBeenCalledTimes(2)
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})
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it('splits text over 600 chars and merges audio segments', async () => {
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const wavA = buildWavBuffer(100)
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const wavB = buildWavBuffer(200)
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let generationCallCount = 0
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const fetchMock = vi.fn(async (input: string) => {
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if (input.includes('/multimodal-generation/generation')) {
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generationCallCount += 1
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const audioUrl = generationCallCount === 1
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? 'https://audio.example/segment-a.wav'
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: 'https://audio.example/segment-b.wav'
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return {
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ok: true,
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text: async () => JSON.stringify({
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output: {
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audio: { url: audioUrl },
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},
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usage: { characters: 600 },
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request_id: `req-${generationCallCount}`,
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}),
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}
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}
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if (input === 'https://audio.example/segment-a.wav') {
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return {
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ok: true,
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status: 200,
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arrayBuffer: async () => wavA.buffer.slice(wavA.byteOffset, wavA.byteOffset + wavA.byteLength),
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}
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}
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if (input === 'https://audio.example/segment-b.wav') {
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return {
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ok: true,
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status: 200,
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arrayBuffer: async () => wavB.buffer.slice(wavB.byteOffset, wavB.byteOffset + wavB.byteLength),
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}
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}
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throw new Error(`unexpected fetch url: ${input}`)
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})
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vi.stubGlobal('fetch', fetchMock as unknown as typeof fetch)
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const result = await synthesizeWithBailianTTS({
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text: 'a'.repeat(601),
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voiceId: 'voice_2',
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}, 'bl-key')
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expect(result.success).toBe(true)
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expect(result.audioData).toBeDefined()
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expect(result.audioDuration).toBe(300)
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expect(result.audioUrl).toBeUndefined()
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expect(result.characters).toBe(1200)
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expect(generationCallCount).toBe(2)
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})
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it('fails explicitly when voiceId is missing', async () => {
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const fetchMock = vi.fn()
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vi.stubGlobal('fetch', fetchMock as unknown as typeof fetch)
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const result = await synthesizeWithBailianTTS({
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text: 'hello',
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voiceId: '',
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}, 'bl-key')
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expect(result).toEqual({
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success: false,
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error: 'BAILIAN_TTS_VOICE_ID_REQUIRED',
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})
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expect(fetchMock).not.toHaveBeenCalled()
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})
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})
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