Implement OpenAI Text-to-Speech Conversion Model #126
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Move voice parameter handling to follow codebase philosophy: SDK validates structure/format, API validates business rules. The abstract class no longer sets a default voice, allowing the OpenAI API to return a clear error if voice is not configured. This makes the TTS implementation consistent with text generation and image generation models.
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First OSS contribution! Had Opus 4.5 help a bit, tried to follow all the contribution guidelines and code checks I could find.
Resolves #90
This implements text-to-speech conversion support for OpenAI, enabling the
SDK to convert text input to audio output using OpenAI's TTS API.
Changes
OpenAI-compatible TTS providers
Supported Features
shimmer, verse
Implementation Notes
The abstract base class follows the same pattern as
AbstractOpenAiCompatibleImageGenerationModel, making it reusable for other
providers that implement OpenAI-compatible TTS endpoints.
Required API parameters such as
voice must be explicitly configured, and the API returns clear validation
errors if omitted. This keeps the abstract class clean for other
OpenAI-compatible providers that may have different voice options.
The TTS API returns binary audio
data directly. The implementation handles this by base64-encoding the
response and wrapping it in a File object within the standard
GenerativeAiResult structure. Would like more review on this approach in
particular.