openapi: 3.0.1
info:
  title: Sarvam AI Chat Text to Speech API
  description: REST API for Sarvam AI, India's full-stack sovereign AI platform. Provides chat completions over Sarvam's Indic LLMs, speech-to-text and speech-to-text-translate, text-to-speech, text translation, transliteration, and language identification across Indian languages. All requests authenticate with an api-subscription-key header.
  termsOfService: https://www.sarvam.ai/terms-of-service
  contact:
    name: Sarvam AI Support
    url: https://www.sarvam.ai
  version: '1.0'
servers:
- url: https://api.sarvam.ai
security:
- ApiSubscriptionKey: []
tags:
- name: Text to Speech
paths:
  /text-to-speech:
    post:
      operationId: convertTextToSpeech
      tags:
      - Text to Speech
      summary: Convert text to speech
      description: Synthesizes natural speech for Indian languages using the Bulbul models (v2, v3) with 30+ speakers and configurable pace, pitch, sample rate, and output audio codec. Returns base64-encoded audio.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TextToSpeechRequest'
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TextToSpeechResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
components:
  schemas:
    TextToSpeechResponse:
      type: object
      properties:
        request_id:
          type: string
        audios:
          type: array
          items:
            type: string
            description: Base64-encoded audio.
    TextToSpeechRequest:
      type: object
      required:
      - text
      - target_language_code
      properties:
        text:
          type: string
          description: Max 2500 chars (bulbul:v3) or 1500 chars (bulbul:v2).
        target_language_code:
          type: string
          enum:
          - bn-IN
          - en-IN
          - gu-IN
          - hi-IN
          - kn-IN
          - ml-IN
          - mr-IN
          - od-IN
          - pa-IN
          - ta-IN
          - te-IN
        speaker:
          type: string
          description: Voice name; default shubh (v3) or anushka (v2).
        model:
          type: string
          enum:
          - bulbul:v2
          - bulbul:v3
          default: bulbul:v3
        pitch:
          type: number
          description: -0.75 to 0.75. bulbul:v2 only.
        pace:
          type: number
          default: 1.0
          description: v3 0.5-2.0; v2 0.3-3.0.
        loudness:
          type: number
          description: 0.3 to 3.0. bulbul:v2 only.
        speech_sample_rate:
          type: integer
          default: 24000
          enum:
          - 8000
          - 16000
          - 22050
          - 24000
          - 32000
          - 44100
          - 48000
        enable_preprocessing:
          type: boolean
          default: false
        temperature:
          type: number
          default: 0.6
          description: 0.01 to 2.0. v3 only.
        output_audio_codec:
          type: string
          default: wav
          enum:
          - mp3
          - linear16
          - mulaw
          - alaw
          - opus
          - flac
          - aac
          - wav
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
            code:
              type: string
  responses:
    Unauthorized:
      description: Missing or invalid api-subscription-key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    TooManyRequests:
      description: Rate limit exceeded.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    ApiSubscriptionKey:
      type: apiKey
      in: header
      name: api-subscription-key
      description: API subscription key created in the Sarvam AI dashboard.