Text-to-Speech

Overview

The text-to-speech system will provide AI-powered voice synthesis capabilities, allowing users to convert text content into natural-sounding speech. This feature will support multiple voice providers, various languages, and different voice styles to meet diverse user needs.

Planned Features

Voice Providers

• OpenAI TTS: High-quality neural voices with multiple language support
• ElevenLabs: Premium voice synthesis with emotion and style control
• Azure Speech: Microsoft's enterprise-grade text-to-speech service
• Google Cloud TTS: Google's advanced voice synthesis technology

Voice Options

• Languages: English, Chinese, Spanish, French, German, Japanese, and more
• Voice Styles: Professional, casual, emotional, storytelling
• Speed Control: Adjustable speech rate and pitch
• Audio Formats: MP3, WAV, OGG support

Quality Levels

• Standard: Basic voice synthesis for general use
• Premium: High-quality voices with natural intonation
• Ultra: Studio-quality voices with advanced features

Planned API Structure

Text-to-Speech API

// POST /api/demo/text-to-speech
interface TTSRequest {
  text: string;
  provider: "openai" | "elevenlabs" | "azure" | "google";
  voice?: string;
  language?: string;
  speed?: number;
  pitch?: number;
  format?: "mp3" | "wav" | "ogg";
}

interface TTSResponse {
  success: boolean;
  data?: {
    audio_url: string;
    duration: number;
    file_size: number;
    provider: string;
    voice: string;
  };
  error?: string;
}

Usage Example

// Planned text-to-speech implementation
const convertToSpeech = async (text: string, voice: string) => {
  const response = await fetch("/api/demo/text-to-speech", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      text,
      provider: "openai",
      voice,
      language: "en-US",
      speed: 1.0,
      format: "mp3",
    }),
  });

  const result = await response.json();
  
  if (result.success) {
    // Play the generated audio
    const audio = new Audio(result.data.audio_url);
    audio.play();
  } else {
    console.error("TTS failed:", result.error);
  }
};

Planned Implementation

Phase 1: Basic TTS

• OpenAI TTS integration
• Basic voice options
• MP3 output format
• Simple text input

Phase 2: Enhanced Features

• Multiple provider support
• Voice customization options
• Batch processing
• Audio streaming

Phase 3: Advanced Features

• Real-time synthesis
• Voice cloning
• Emotion control
• Multi-language support

Credit System Integration

Planned Pricing

// Planned credit costs for TTS
const TTS_CREDIT_COSTS = {
  openai: {
    standard: 2,    // per 1000 characters
    premium: 5,     // per 1000 characters
  },
  elevenlabs: {
    standard: 3,    // per 1000 characters
    premium: 8,     // per 1000 characters
  },
  azure: {
    standard: 1,    // per 1000 characters
    premium: 3,     // per 1000 characters
  },
};

Planned File Structure

src/
├── app/api/demo/text-to-speech/
│   └── route.ts                    # TTS API endpoint
├── services/
│   ├── tts/
│   │   ├── openai-tts.ts          # OpenAI TTS service
│   │   ├── elevenlabs-tts.ts      # ElevenLabs TTS service
│   │   └── azure-tts.ts           # Azure TTS service
│   └── tts-manager.ts             # TTS service manager
├── components/
│   ├── tts-player.tsx             # Audio player component
│   └── tts-generator.tsx          # TTS generation interface
└── models/
    └── tts-usage.ts               # TTS usage tracking

Planned User Interface

TTS Generator Component

// Planned TTS generator interface
export function TTSGenerator() {
  const [text, setText] = useState('');
  const [voice, setVoice] = useState('alloy');
  const [isGenerating, setIsGenerating] = useState(false);
  const [audioUrl, setAudioUrl] = useState('');

  const generateSpeech = async () => {
    setIsGenerating(true);
    
    try {
      const response = await fetch("/api/demo/text-to-speech", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ text, voice, provider: "openai" }),
      });

      const result = await response.json();
      
      if (result.success) {
        setAudioUrl(result.data.audio_url);
      }
    } catch (error) {
      console.error("TTS generation failed:", error);
    } finally {
      setIsGenerating(false);
    }
  };

  return (
    <div className="space-y-4">
      <textarea
        value={text}
        onChange={(e) => setText(e.target.value)}
        placeholder="Enter text to convert to speech..."
        className="w-full p-3 border rounded-lg"
        rows={4}
      />
      
      <select
        value={voice}
        onChange={(e) => setVoice(e.target.value)}
        className="p-2 border rounded-lg"
      >
        <option value="alloy">Alloy (Neutral)</option>
        <option value="echo">Echo (Male)</option>
        <option value="fable">Fable (British)</option>
        <option value="onyx">Onyx (Deep)</option>
        <option value="nova">Nova (Female)</option>
        <option value="shimmer">Shimmer (Soft)</option>
      </select>
      
      <button
        onClick={generateSpeech}
        disabled={isGenerating || !text.trim()}
        className="px-4 py-2 bg-blue-500 text-white rounded-lg disabled:opacity-50"
      >
        {isGenerating ? 'Generating...' : 'Generate Speech'}
      </button>
      
      {audioUrl && (
        <audio controls className="w-full">
          <source src={audioUrl} type="audio/mpeg" />
          Your browser does not support the audio element.
        </audio>
      )}
    </div>
  );
}

Planned Use Cases

Content Creation

• Podcast narration
• Video voiceovers
• Audiobook generation
• Educational content

Accessibility

• Screen reader enhancement
• Language learning
• Visual impairment support
• Multilingual content

Business Applications

• Customer service automation
• Training materials
• Marketing content
• Internal communications

Development Timeline

Q1 2024

• OpenAI TTS integration
• Basic voice options
• Simple user interface

Q2 2024

• Multiple provider support
• Voice customization
• Batch processing

Q3 2024

• Advanced features
• Real-time synthesis
• Voice cloning

Next Steps

• Text Generation - Generate text content
• Streaming Text - Real-time text generation
• AI Generator - AI features interface