From 8e0643c64f4797998a2e056db1ccab44263f50c6 Mon Sep 17 00:00:00 2001 From: Bilal Tahir Date: Wed, 10 Jun 2026 16:43:26 -0700 Subject: [PATCH 1/2] feat: add optional speech-sdk TTS backend (14 cloud providers) Adds TTS_PROVIDER=speechsdk as a fourth synthesis backend. One integration covers OpenAI, ElevenLabs, Cartesia, Hume, Deepgram, Google Gemini TTS, MiniMax, Fish Audio, Murf, Resemble, fal, Mistral, xAI, and Inworld, selected with SPEECH_SDK_MODEL=/. Defaults to openai/gpt-4o-mini-tts using the OPENAI_API_KEY most installs already set for the LLM. Existing backends and the edge default are untouched. Co-Authored-By: Claude Fable 5 --- .env.example | 12 +- README.md | 2 +- backend/src/config/env.ts | 3 + backend/src/utils/tts/index.ts | 66 +- package-lock.json | 1427 +++++++++++++++++++++++++++++++- package.json | 1 + 6 files changed, 1463 insertions(+), 48 deletions(-) diff --git a/.env.example b/.env.example index 6d338a2..2eda6ba 100755 --- a/.env.example +++ b/.env.example @@ -78,7 +78,7 @@ OLLAMA_BASE_URL=http://localhost:11434 ######################################## # Podcast / TTS ######################################## -TTS_PROVIDER=edge # edge | google | eleven +TTS_PROVIDER=edge # edge | google | eleven | speechsdk FFMPEG_PATH=ffmpeg # Edge-tts voices @@ -95,6 +95,16 @@ GOOGLE_APPLICATION_CREDENTIALS=/path/to/service-account.json TTS_VOICE_GOOGLE=en-US-Neural2-F TTS_VOICE_ALT_GOOGLE=en-US-Neural2-D +# Speech SDK (one backend, 14 cloud TTS providers: openai, elevenlabs, cartesia, +# hume, deepgram, google, minimax, fish-audio, murf, resemble, fal-ai, mistral, +# xai, inworld). Uses the matching provider key from your env directly, e.g. the +# OPENAI_API_KEY above. Optionally set SPEECHBASE_API_KEY (speechbase.ai) to +# route every provider through that single key instead. +SPEECH_SDK_MODEL=openai/gpt-4o-mini-tts +SPEECH_SDK_VOICE_A=alloy +SPEECH_SDK_VOICE_B=echo +#SPEECHBASE_API_KEY= + ######################################## # Voice Transcription ######################################## diff --git a/README.md b/README.md index 425fb6f..c90351f 100755 --- a/README.md +++ b/README.md @@ -95,7 +95,7 @@ The platform provides a modern interface for students, educators, and researcher | **Frontend** | Vite, React, TailwindCSS | | **Database** | JSON (default), optional vector DB | | **AI/ML** | Multiple LLM providers, embeddings | -| **Audio** | Edge TTS, ElevenLabs, Google TTS | +| **Audio** | Edge TTS, ElevenLabs, Google TTS, Speech SDK (OpenAI, Cartesia, Hume, MiniMax + 10 more) | | **Deployment** | Docker, Docker Compose | | **Docs** | pdf-lib, mammoth, pdf-parse | diff --git a/backend/src/config/env.ts b/backend/src/config/env.ts index 82d8a81..8d8b11e 100755 --- a/backend/src/config/env.ts +++ b/backend/src/config/env.ts @@ -44,6 +44,9 @@ export const config = { google_creds: process.env.GOOGLE_APPLICATION_CREDENTIALS || '', tts_voice_google: process.env.TTS_VOICE_GOOGLE || 'en-US-Neural2-F', tts_voice_alt_google: process.env.TTS_VOICE_ALT_GOOGLE || 'en-US-Neural2-D', + speech_sdk_model: process.env.SPEECH_SDK_MODEL || 'openai/gpt-4o-mini-tts', + speech_sdk_voice_a: process.env.SPEECH_SDK_VOICE_A || 'alloy', + speech_sdk_voice_b: process.env.SPEECH_SDK_VOICE_B || 'echo', transcription_provider: process.env.TRANSCRIPTION_PROVIDER || 'openai', assemblyai_api_key: process.env.ASSEMBLYAI_API_KEY || '', google_project_id: process.env.GOOGLE_CLOUD_PROJECT_ID || '', diff --git a/backend/src/utils/tts/index.ts b/backend/src/utils/tts/index.ts index c62aa2a..8267cc6 100755 --- a/backend/src/utils/tts/index.ts +++ b/backend/src/utils/tts/index.ts @@ -7,6 +7,36 @@ import { config } from '../../config/env' export type TSeg = { text: string; voice?: string } export type TSay = (segs: TSeg[], dir: string, base: string, emit?: (m: any) => void) => Promise +// @speech-sdk/core is ESM-only and this backend compiles to CJS, so the import() must survive tsc transpilation +const dynImport = new Function('s', 'return import(s)') as (s: string) => Promise + +let sdkLoad: Promise<{ generateSpeech: any; factories: Record }> | null = null + +function sdk() { + if (!sdkLoad) { + sdkLoad = Promise.all([dynImport('@speech-sdk/core'), dynImport('@speech-sdk/core/providers')]).then(([core, prov]) => ({ + generateSpeech: core.generateSpeech, + factories: { + cartesia: prov.createCartesia, + deepgram: prov.createDeepgram, + elevenlabs: prov.createElevenLabs, + 'fal-ai': prov.createFal, + 'fish-audio': prov.createFishAudio, + google: prov.createGoogle, + hume: prov.createHume, + inworld: prov.createInworld, + minimax: prov.createMiniMax, + mistral: prov.createMistral, + murf: prov.createMurf, + openai: prov.createOpenAI, + resemble: prov.createResemble, + xai: prov.createXai + } + })) + } + return sdkLoad +} + function ff(dir: string, parts: string[], out: string, emit?: (m: any) => void) { return new Promise((res, rej) => { const list = path.join(dir, 'list.txt') @@ -155,15 +185,49 @@ async function synth_google(segs: TSeg[], dir: string, base: string, emit?: (m: return await ff(dir, files, out, emit) } +function sdk_model(m: string, factories: Record) { + // with SPEECHBASE_API_KEY set, the bare string routes every provider through the hosted gateway; otherwise call the provider directly with its own env key + if (process.env.SPEECHBASE_API_KEY) return m + const i = m.indexOf('/') + const provider = i === -1 ? m : m.slice(0, i) + const modelId = i === -1 ? '' : m.slice(i + 1) + const factory = factories[provider] + if (!factory) throw new Error(`speechsdk_unknown_provider_${provider}`) + return factory()(modelId || undefined) +} + +async function synth_speechsdk(segs: TSeg[], dir: string, base: string, emit?: (m: any) => void) { + const { generateSpeech, factories } = await sdk() + const v0 = config.speech_sdk_voice_a || 'alloy' + const v1 = config.speech_sdk_voice_b || 'echo' + const model = sdk_model(config.speech_sdk_model || 'openai/gpt-4o-mini-tts', factories) + const files: string[] = [] + + for (let i = 0; i < segs.length; i++) { + const s = segs[i] + const v = s.voice || (i % 2 ? v1 : v0) + const r = await generateSpeech({ model, text: s.text, voice: v, output: { format: 'mp3' } }) + const f = path.join(dir, `${base}.${i}.mp3`) + await fs.promises.writeFile(f, r.audio.uint8Array) + files.push(f) + emit && emit({ type: 'audio_progress', i, len: segs.length }) + } + + const out = path.join(dir, `${base}.mp3`) + return await ff(dir, files, out, emit) +} + export const tts: TSay = async (segs, dir, base, emit) => { const p = config.tts_provider || 'edge' - + if (p === 'edge') { return synth_edge(segs, dir, base, emit) } else if (p === 'eleven') { return synth_eleven(segs, dir, base, emit) } else if (p === 'google') { return synth_google(segs, dir, base, emit) + } else if (p === 'speechsdk') { + return synth_speechsdk(segs, dir, base, emit) } else { return synth_edge(segs, dir, base, emit) } diff --git a/package-lock.json b/package-lock.json index 180dc1d..9b083fa 100644 --- a/package-lock.json +++ b/package-lock.json @@ -17,6 +17,7 @@ "@langchain/ollama": "^0.2.4", "@langchain/openai": "^0.6.12", "@pdf-lib/fontkit": "^1.1.1", + "@speech-sdk/core": "^0.15.0", "busboy": "^1.6.0", "cors": "^2.8.5", "d3-force": "^3.0.0", @@ -37,7 +38,8 @@ "@types/node": "^24.5.1", "ts-node": "^10.9.2", "tsx": "^4.20.5", - "typescript": "^5.8.3" + "typescript": "^5.8.3", + "vitest": "^4.1.1" }, "engines": { "node": ">=21.18.0" @@ -91,6 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b/package.json @@ -26,6 +26,7 @@ "@langchain/ollama": "^0.2.4", "@langchain/openai": "^0.6.12", "@pdf-lib/fontkit": "^1.1.1", + "@speech-sdk/core": "^0.15.0", "busboy": "^1.6.0", "cors": "^2.8.5", "d3-force": "^3.0.0", From ad06480c7558abd6a5d422f5469d06dd5eb30370 Mon Sep 17 00:00:00 2001 From: Bilal Tahir Date: Wed, 10 Jun 2026 16:53:03 -0700 Subject: [PATCH 2/2] refactor: render speechsdk podcasts with generateConversation One call renders the full dialogue: native multi-speaker models where the provider has one, otherwise parallel per-turn synthesis stitched and loudness-normalized to -20 dBFS by the SDK. Removes the per-segment ffmpeg concat from this backend. Co-Authored-By: Claude Fable 5 --- backend/src/utils/tts/index.ts | 23 +++++++++-------------- 1 file changed, 9 insertions(+), 14 deletions(-) diff --git a/backend/src/utils/tts/index.ts b/backend/src/utils/tts/index.ts index 8267cc6..9656b2c 100755 --- a/backend/src/utils/tts/index.ts +++ b/backend/src/utils/tts/index.ts @@ -10,12 +10,12 @@ export type TSay = (segs: TSeg[], dir: string, base: string, emit?: (m: any) => // @speech-sdk/core is ESM-only and this backend compiles to CJS, so the import() must survive tsc transpilation const dynImport = new Function('s', 'return import(s)') as (s: string) => Promise -let sdkLoad: Promise<{ generateSpeech: any; factories: Record }> | null = null +let sdkLoad: Promise<{ generateConversation: any; factories: Record }> | null = null function sdk() { if (!sdkLoad) { sdkLoad = Promise.all([dynImport('@speech-sdk/core'), dynImport('@speech-sdk/core/providers')]).then(([core, prov]) => ({ - generateSpeech: core.generateSpeech, + generateConversation: core.generateConversation, factories: { cartesia: prov.createCartesia, deepgram: prov.createDeepgram, @@ -197,24 +197,19 @@ function sdk_model(m: string, factories: Record) { } async function synth_speechsdk(segs: TSeg[], dir: string, base: string, emit?: (m: any) => void) { - const { generateSpeech, factories } = await sdk() + const { generateConversation, factories } = await sdk() const v0 = config.speech_sdk_voice_a || 'alloy' const v1 = config.speech_sdk_voice_b || 'echo' const model = sdk_model(config.speech_sdk_model || 'openai/gpt-4o-mini-tts', factories) - const files: string[] = [] + const turns = segs.map((s, i) => ({ text: s.text, voice: s.voice || (i % 2 ? v1 : v0) })) - for (let i = 0; i < segs.length; i++) { - const s = segs[i] - const v = s.voice || (i % 2 ? v1 : v0) - const r = await generateSpeech({ model, text: s.text, voice: v, output: { format: 'mp3' } }) - const f = path.join(dir, `${base}.${i}.mp3`) - await fs.promises.writeFile(f, r.audio.uint8Array) - files.push(f) - emit && emit({ type: 'audio_progress', i, len: segs.length }) - } + // one call renders the whole dialogue: native multi-speaker models when the provider has one, otherwise per-turn synthesis stitched and loudness-normalized (-20 dBFS) by the SDK, so no ffmpeg pass is needed + const r = await generateConversation({ model, turns, output: { format: 'mp3' } }) const out = path.join(dir, `${base}.mp3`) - return await ff(dir, files, out, emit) + await fs.promises.writeFile(out, r.audio.uint8Array) + emit && emit({ type: 'audio_progress', i: segs.length - 1, len: segs.length }) + return out } export const tts: TSay = async (segs, dir, base, emit) => {