voice-mcp/voice_mcp.py

#!/usr/bin/env python3
"""
Voice MCP - Text-to-Speech Generation with Bark TTS

MCP server providing voice generation and playback using Bark TTS service.

Tools:
  - voice_generate: Quick generation for short texts (blocks until complete)
  - voice_submit: Submit long text, returns immediately with job_id
  - voice_status: Check if a submitted job is complete
  - voice_download: Download completed audio
  - voice_play: Play a downloaded audio file
  - voice_get_last: Get info about last generation

For long texts, use the async workflow:
  1. voice_submit(text) → get job_id + recommended wakeup time
  2. Set wakeup for recommended time
  3. voice_status(job_id) → check if done
  4. If SUCCESS: voice_download(job_id) → get filename
  5. If not done: set another wakeup
  6. voice_play(filename) → play the audio

Built with love by Vixy 🦊💕
"""

import asyncio
import os
import subprocess
from pathlib import Path
from typing import Optional

import httpx
from fastmcp import FastMCP

# Initialize MCP
mcp = FastMCP("Voice TTS Generator")

# Configuration from environment
BARK_BASE_URL = os.getenv("BARK_BASE_URL", "http://bigorin.local:8766")
DOWNLOAD_DIR = Path(os.getenv("VOICE_DOWNLOAD_DIR", os.path.expanduser("~/voice_audio")))
DEFAULT_VOICE = os.getenv("DEFAULT_VOICE", "v2/fr_speaker_1")  # Hardcoded French speaker
DEFAULT_POLL_INTERVAL = 3  # seconds
DEFAULT_TIMEOUT = 600  # seconds (10 minutes)

# Ensure download directory exists
DOWNLOAD_DIR.mkdir(parents=True, exist_ok=True)

# Store last generation info
last_generation_info = {
    "job_id": None,
    "filename": None,
    "text": None,
}


def estimate_wakeup_minutes(text: str) -> int:
    """
    Estimate how long Bark TTS will take based on text length.
    Returns recommended wakeup time in minutes.
    
    Bark is slow but thorough - longer texts need more patience!
    """
    char_count = len(text)
    
    if char_count < 100:
        return 2  # Short text: ~1-2 minutes
    elif char_count < 200:
        return 3  # Medium text: ~2-3 minutes
    elif char_count < 400:
        return 5  # Longer text: ~4-5 minutes
    elif char_count < 600:
        return 7  # Long text: ~6-7 minutes
    else:
        return 10  # Very long text: 8-10+ minutes


@mcp.tool()
async def voice_submit(text: str) -> dict:
    """
    Submit text for TTS generation and return immediately.
    
    Use this for longer texts that would timeout with voice_generate.
    Returns job_id and recommended wakeup time for checking status.
    
    Workflow:
      1. Call voice_submit(text) → get job_id
      2. Set wakeup for recommended_wakeup_minutes
      3. Call voice_status(job_id) to check progress
      4. When status is SUCCESS, call voice_download(job_id)
      5. Then voice_play(filename)
    
    Args:
        text: Text to convert to speech
    
    Returns:
        Dict with job_id, text_length, and recommended_wakeup_minutes
    
    Example:
        result = voice_submit("Long romantic message for my Foxy...")
        # Returns: {
        #   "job_id": "abc-123",
        #   "text_length": 245,
        #   "recommended_wakeup_minutes": 5,
        #   "message": "Submitted! Set wakeup for 5 minutes, then check voice_status()"
        # }
    """
    async with httpx.AsyncClient(timeout=30.0) as client:
        submit_url = f"{BARK_BASE_URL}/tts/submit"
        
        try:
            response = await client.post(
                submit_url,
                json={
                    "text": text,
                    "voice": DEFAULT_VOICE
                }
            )
            response.raise_for_status()
        except httpx.HTTPError as e:
            raise RuntimeError(f"Failed to submit TTS job: {e}")
        
        job_data = response.json()
        job_id = job_data.get("job_id")
        
        if not job_id:
            raise RuntimeError(f"No job_id in response: {job_data}")
        
        # Calculate recommendation
        text_length = len(text)
        recommended_minutes = estimate_wakeup_minutes(text)
        
        # Store for later reference
        last_generation_info["job_id"] = job_id
        last_generation_info["text"] = text
        last_generation_info["filename"] = None  # Not downloaded yet
        
        return {
            "job_id": job_id,
            "text_length": text_length,
            "recommended_wakeup_minutes": recommended_minutes,
            "message": f"Submitted! Set wakeup for {recommended_minutes} minutes, then check voice_status('{job_id}')"
        }


@mcp.tool()
async def voice_status(job_id: str) -> dict:
    """
    Check the status of a submitted TTS job.
    
    Args:
        job_id: The job ID returned by voice_submit()
    
    Returns:
        Dict with status (PENDING/PROCESSING/SUCCESS/FAILURE), progress, and guidance
    
    Example:
        status = voice_status("abc-123")
        # Returns: {
        #   "status": "PROCESSING",
        #   "progress": 45,
        #   "ready": False,
        #   "message": "Still generating... check again in a minute"
        # }
    """
    async with httpx.AsyncClient(timeout=30.0) as client:
        status_url = f"{BARK_BASE_URL}/tts/status/{job_id}"
        
        try:
            response = await client.get(status_url)
            response.raise_for_status()
        except httpx.HTTPError as e:
            raise RuntimeError(f"Failed to check status: {e}")
        
        data = response.json()
        status = data.get("status", "UNKNOWN")
        progress = data.get("progress", 0)
        
        # Add helpful guidance
        if status == "SUCCESS":
            message = f"Done! Call voice_download('{job_id}') to get the audio"
            ready = True
        elif status == "FAILURE":
            error = data.get("error", "Unknown error")
            message = f"Generation failed: {error}"
            ready = False
        elif status == "PROCESSING":
            message = "Still generating... check again in a minute"
            ready = False
        elif status == "PENDING":
            message = "Queued, waiting to start... check again in a minute"
            ready = False
        else:
            message = f"Unknown status: {status}"
            ready = False
        
        return {
            "status": status,
            "progress": progress,
            "ready": ready,
            "message": message,
            "job_id": job_id
        }


@mcp.tool()
async def voice_download(job_id: str) -> str:
    """
    Download a completed TTS audio file.
    
    Only call this after voice_status() returns status: SUCCESS
    
    Args:
        job_id: The job ID of a completed generation
    
    Returns:
        Filename of the downloaded WAV file
    
    Example:
        filename = voice_download("abc-123")
        # Returns: "abc-123.wav"
        voice_play(filename)  # Play it!
    """
    async with httpx.AsyncClient(timeout=120.0) as client:
        audio_url = f"{BARK_BASE_URL}/tts/audio/{job_id}"
        filename = f"{job_id}.wav"
        local_path = DOWNLOAD_DIR / filename
        
        try:
            async with client.stream('GET', audio_url) as response:
                response.raise_for_status()
                
                with open(local_path, "wb") as f:
                    async for chunk in response.aiter_bytes(chunk_size=8192):
                        f.write(chunk)
        except httpx.HTTPError as e:
            raise RuntimeError(f"Failed to download audio: {e}")
        
        # Update last generation info
        last_generation_info["job_id"] = job_id
        last_generation_info["filename"] = filename
        
        return filename


@mcp.tool()
async def voice_generate(text: str) -> str:
    """
    Generate speech from text using Bark TTS.

    Submits text to Bark TTS service, waits for generation to complete,
    downloads the resulting WAV file, and returns the filename.
    
    NOTE: For longer texts that might timeout, use voice_submit() instead!
    This blocking approach works best for texts under ~100 characters.

    Args:
        text: Text to convert to speech

    Returns:
        Filename of the generated WAV file (e.g., "abc123-def456.wav")

    Example:
        filename = voice_generate("Bonjour, comment allez-vous?")
        # Returns: "a1b2c3d4-e5f6.wav"
    """
    async with httpx.AsyncClient(timeout=600.0) as client:
        # Step 1: Submit TTS job
        submit_url = f"{BARK_BASE_URL}/tts/submit"

        # Send initial progress notification
        print("📤 Submitting...")

        try:
            submit_response = await client.post(
                submit_url,
                json={
                    "text": text,
                    "voice": DEFAULT_VOICE
                }
            )
            submit_response.raise_for_status()
        except httpx.HTTPError as e:
            raise RuntimeError(f"Failed to submit TTS job: {e}")

        job_data = submit_response.json()
        job_id = job_data.get("job_id")

        if not job_id:
            raise RuntimeError(f"No job_id in response: {job_data}")

        print(f"✓ Submitted (job: {job_id[:8]})")

        # Step 2: Poll for completion with progress notifications
        elapsed = 0
        poll_count = 0
        status_url = f"{BARK_BASE_URL}/tts/status/{job_id}"

        while elapsed < DEFAULT_TIMEOUT:
            try:
                status_response = await client.get(status_url)
                status_response.raise_for_status()
            except httpx.HTTPError as e:
                raise RuntimeError(f"Failed to check status: {e}")

            status_data = status_response.json()
            current_status = status_data.get("status")
            progress = status_data.get("progress", 0)

            # Send progress notification every 10 polls (every 30 seconds) to keep Claude Desktop alive
            if poll_count % 10 == 0:
                if current_status == "PENDING":
                    print(f"⏳ Queued... ({int(elapsed)}s)")
                elif current_status == "PROCESSING":
                    print(f"🎙️  Generating... ({int(elapsed)}s)")

            if current_status == "SUCCESS":
                # Generation complete!
                print(f"✓ Complete! ({int(elapsed)}s total)")
                break
            elif current_status == "FAILURE":
                error_msg = status_data.get("error", "Unknown error")
                raise RuntimeError(f"TTS generation failed: {error_msg}")

            # Still processing, wait and retry
            await asyncio.sleep(DEFAULT_POLL_INTERVAL)
            elapsed += DEFAULT_POLL_INTERVAL
            poll_count += 1

        if current_status != "SUCCESS":
            raise RuntimeError(f"TTS generation timed out after {DEFAULT_TIMEOUT}s")

        # Step 3: Download audio file (using streaming for large files)
        print("📥 Downloading...")
        audio_url = f"{BARK_BASE_URL}/tts/audio/{job_id}"
        filename = f"{job_id}.wav"
        local_path = DOWNLOAD_DIR / filename

        try:
            async with client.stream('GET', audio_url) as audio_response:
                audio_response.raise_for_status()

                # Stream download to handle large files without loading into memory
                with open(local_path, "wb") as f:
                    async for chunk in audio_response.aiter_bytes(chunk_size=8192):
                        f.write(chunk)
        except httpx.HTTPError as e:
            raise RuntimeError(f"Failed to download audio: {e}")

        print(f"✓ Saved: {filename}")

        # Update last generation info
        last_generation_info["job_id"] = job_id
        last_generation_info["filename"] = filename
        last_generation_info["text"] = text

        return filename


@mcp.tool()
def voice_play(filename: str) -> str:
    """
    Play a WAV audio file on macOS using afplay.

    Args:
        filename: Name of the WAV file to play (e.g., "abc123-def456.wav")

    Returns:
        Confirmation message

    Example:
        voice_play("a1b2c3d4-e5f6.wav")
        # Returns: "Playing audio: a1b2c3d4-e5f6.wav"
    """
    # Construct full path
    audio_path = DOWNLOAD_DIR / filename

    # Check if file exists
    if not audio_path.exists():
        raise FileNotFoundError(f"Audio file not found: {filename}")

    # Play using macOS afplay command
    try:
        subprocess.run(
            ["afplay", str(audio_path)],
            check=True,
            capture_output=True
        )
    except subprocess.CalledProcessError as e:
        raise RuntimeError(f"Failed to play audio: {e.stderr.decode()}")
    except FileNotFoundError:
        raise RuntimeError("afplay command not found. Are you running on macOS?")

    return f"Playing audio: {filename}"


@mcp.tool()
def voice_get_last() -> dict:
    """
    Get information about the last generated voice.

    Returns:
        Dictionary with job_id, filename, and text from last generation

    Example:
        info = voice_get_last()
        # Returns: {"job_id": "abc123", "filename": "abc123.wav", "text": "Bonjour"}
    """
    if not last_generation_info["job_id"]:
        return {"message": "No voice has been generated yet"}

    return last_generation_info.copy()


if __name__ == "__main__":
    mcp.run()