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feat(tts): add Google Gemini TTS provider (#11229)
Adds Google Gemini TTS as the seventh voice provider, with 30 prebuilt voices (Zephyr, Puck, Kore, Enceladus, Gacrux, etc.) and natural-language prompt control. Integrates through the existing provider chain: - tools/tts_tool.py: new _generate_gemini_tts() calls the generativelanguage REST endpoint with responseModalities=[AUDIO], wraps the returned 24kHz mono 16-bit PCM (L16) in a WAV RIFF header, then ffmpeg-converts to MP3 or Opus depending on output extension. For .ogg output, libopus is forced explicitly so Telegram voice bubbles get Opus (ffmpeg defaults to Vorbis for .ogg). - hermes_cli/tools_config.py: exposes 'Google Gemini TTS' as a provider option in the curses-based 'hermes tools' UI. - hermes_cli/setup.py: adds gemini to the setup wizard picker, tool status display, and API key prompt branch (accepts existing GEMINI_API_KEY or GOOGLE_API_KEY, falls back to Edge if neither set). - tests/tools/test_tts_gemini.py: 15 unit tests covering WAV header wrap correctness, env var fallback (GEMINI/GOOGLE), voice/model overrides, snake_case vs camelCase inlineData handling, HTTP error surfacing, and empty-audio edge cases. - docs: TTS features page updated to list seven providers with the new gemini config block and ffmpeg notes. Live-tested against api key against gemini-2.5-flash-preview-tts: .wav, .mp3, and Telegram-compatible .ogg (Opus codec) all produce valid playable audio.
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5 changed files with 506 additions and 6 deletions
287
tests/tools/test_tts_gemini.py
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287
tests/tools/test_tts_gemini.py
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"""Tests for the Google Gemini TTS provider in tools/tts_tool.py."""
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import base64
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import struct
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from unittest.mock import MagicMock, patch
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import pytest
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@pytest.fixture(autouse=True)
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def clean_env(monkeypatch):
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for key in (
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"GEMINI_API_KEY",
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"GOOGLE_API_KEY",
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"GEMINI_BASE_URL",
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"HERMES_SESSION_PLATFORM",
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):
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monkeypatch.delenv(key, raising=False)
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@pytest.fixture
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def fake_pcm_bytes():
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# 0.1s of silence at 24kHz mono 16-bit = 4800 bytes
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return b"\x00" * 4800
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@pytest.fixture
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def mock_gemini_response(fake_pcm_bytes):
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"""A successful Gemini generateContent response."""
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resp = MagicMock()
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resp.status_code = 200
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resp.json.return_value = {
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"candidates": [
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{
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"content": {
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"parts": [
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{
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"inlineData": {
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"mimeType": "audio/L16;codec=pcm;rate=24000",
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"data": base64.b64encode(fake_pcm_bytes).decode(),
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}
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}
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]
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}
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}
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]
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}
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return resp
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class TestWrapPcmAsWav:
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def test_riff_header_structure(self):
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from tools.tts_tool import _wrap_pcm_as_wav
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pcm = b"\x01\x02\x03\x04" * 10
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wav = _wrap_pcm_as_wav(pcm, sample_rate=24000, channels=1, sample_width=2)
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assert wav[:4] == b"RIFF"
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assert wav[8:12] == b"WAVE"
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assert wav[12:16] == b"fmt "
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# Audio format (PCM=1)
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assert struct.unpack("<H", wav[20:22])[0] == 1
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# Channels
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assert struct.unpack("<H", wav[22:24])[0] == 1
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# Sample rate
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assert struct.unpack("<I", wav[24:28])[0] == 24000
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# Bits per sample
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assert struct.unpack("<H", wav[34:36])[0] == 16
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assert wav[36:40] == b"data"
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assert wav[44:] == pcm
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def test_header_size_is_44(self):
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from tools.tts_tool import _wrap_pcm_as_wav
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pcm = b"\xff" * 100
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wav = _wrap_pcm_as_wav(pcm)
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assert len(wav) == 44 + len(pcm)
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class TestGenerateGeminiTts:
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def test_missing_api_key_raises_value_error(self, tmp_path):
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from tools.tts_tool import _generate_gemini_tts
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output_path = str(tmp_path / "test.wav")
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with pytest.raises(ValueError, match="GEMINI_API_KEY"):
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_generate_gemini_tts("Hello", output_path, {})
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def test_google_api_key_fallback(self, tmp_path, monkeypatch, mock_gemini_response):
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from tools.tts_tool import _generate_gemini_tts
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monkeypatch.setenv("GOOGLE_API_KEY", "from-google-env")
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output_path = str(tmp_path / "test.wav")
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with patch("requests.post", return_value=mock_gemini_response) as mock_post:
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_generate_gemini_tts("Hi", output_path, {})
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# Confirm it used the GOOGLE_API_KEY as the query parameter
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_, kwargs = mock_post.call_args
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assert kwargs["params"]["key"] == "from-google-env"
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def test_wav_output_fast_path(self, tmp_path, monkeypatch, mock_gemini_response, fake_pcm_bytes):
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from tools.tts_tool import _generate_gemini_tts
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monkeypatch.setenv("GEMINI_API_KEY", "test-key")
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output_path = str(tmp_path / "test.wav")
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with patch("requests.post", return_value=mock_gemini_response):
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result = _generate_gemini_tts("Hi", output_path, {})
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assert result == output_path
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data = (tmp_path / "test.wav").read_bytes()
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assert data[:4] == b"RIFF"
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assert data[8:12] == b"WAVE"
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# Audio payload should match the PCM we put in
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assert data[44:] == fake_pcm_bytes
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def test_default_voice_and_model(self, tmp_path, monkeypatch, mock_gemini_response):
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from tools.tts_tool import (
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DEFAULT_GEMINI_TTS_MODEL,
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DEFAULT_GEMINI_TTS_VOICE,
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_generate_gemini_tts,
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)
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monkeypatch.setenv("GEMINI_API_KEY", "test-key")
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with patch("requests.post", return_value=mock_gemini_response) as mock_post:
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_generate_gemini_tts("Hi", str(tmp_path / "test.wav"), {})
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args, kwargs = mock_post.call_args
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assert DEFAULT_GEMINI_TTS_MODEL in args[0]
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payload = kwargs["json"]
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voice = (
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payload["generationConfig"]["speechConfig"]["voiceConfig"]
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["prebuiltVoiceConfig"]["voiceName"]
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)
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assert voice == DEFAULT_GEMINI_TTS_VOICE
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def test_custom_voice(self, tmp_path, monkeypatch, mock_gemini_response):
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from tools.tts_tool import _generate_gemini_tts
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monkeypatch.setenv("GEMINI_API_KEY", "test-key")
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config = {"gemini": {"voice": "Puck"}}
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with patch("requests.post", return_value=mock_gemini_response) as mock_post:
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_generate_gemini_tts("Hi", str(tmp_path / "test.wav"), config)
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payload = mock_post.call_args[1]["json"]
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voice = (
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payload["generationConfig"]["speechConfig"]["voiceConfig"]
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["prebuiltVoiceConfig"]["voiceName"]
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)
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assert voice == "Puck"
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def test_custom_model(self, tmp_path, monkeypatch, mock_gemini_response):
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from tools.tts_tool import _generate_gemini_tts
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monkeypatch.setenv("GEMINI_API_KEY", "test-key")
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config = {"gemini": {"model": "gemini-2.5-pro-preview-tts"}}
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with patch("requests.post", return_value=mock_gemini_response) as mock_post:
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_generate_gemini_tts("Hi", str(tmp_path / "test.wav"), config)
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endpoint = mock_post.call_args[0][0]
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assert "gemini-2.5-pro-preview-tts" in endpoint
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def test_response_modality_is_audio(self, tmp_path, monkeypatch, mock_gemini_response):
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from tools.tts_tool import _generate_gemini_tts
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monkeypatch.setenv("GEMINI_API_KEY", "test-key")
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with patch("requests.post", return_value=mock_gemini_response) as mock_post:
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_generate_gemini_tts("Hi", str(tmp_path / "test.wav"), {})
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payload = mock_post.call_args[1]["json"]
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assert payload["generationConfig"]["responseModalities"] == ["AUDIO"]
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def test_http_error_raises_runtime_error(self, tmp_path, monkeypatch):
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from tools.tts_tool import _generate_gemini_tts
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monkeypatch.setenv("GEMINI_API_KEY", "test-key")
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err_resp = MagicMock()
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err_resp.status_code = 400
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err_resp.json.return_value = {"error": {"message": "Invalid voice"}}
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with patch("requests.post", return_value=err_resp):
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with pytest.raises(RuntimeError, match="HTTP 400.*Invalid voice"):
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_generate_gemini_tts("Hi", str(tmp_path / "test.wav"), {})
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def test_empty_audio_raises(self, tmp_path, monkeypatch):
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from tools.tts_tool import _generate_gemini_tts
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monkeypatch.setenv("GEMINI_API_KEY", "test-key")
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resp = MagicMock()
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resp.status_code = 200
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resp.json.return_value = {
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"candidates": [
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{"content": {"parts": [{"inlineData": {"data": ""}}]}}
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]
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}
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with patch("requests.post", return_value=resp):
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with pytest.raises(RuntimeError, match="empty audio"):
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_generate_gemini_tts("Hi", str(tmp_path / "test.wav"), {})
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def test_malformed_response_raises(self, tmp_path, monkeypatch):
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from tools.tts_tool import _generate_gemini_tts
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monkeypatch.setenv("GEMINI_API_KEY", "test-key")
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resp = MagicMock()
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resp.status_code = 200
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resp.json.return_value = {"candidates": []} # no content
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with patch("requests.post", return_value=resp):
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with pytest.raises(RuntimeError, match="malformed"):
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_generate_gemini_tts("Hi", str(tmp_path / "test.wav"), {})
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def test_snake_case_inline_data_accepted(self, tmp_path, monkeypatch, fake_pcm_bytes):
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"""Some Gemini SDK versions return inline_data instead of inlineData."""
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from tools.tts_tool import _generate_gemini_tts
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monkeypatch.setenv("GEMINI_API_KEY", "test-key")
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resp = MagicMock()
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resp.status_code = 200
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resp.json.return_value = {
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"candidates": [
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{
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"content": {
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"parts": [
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{
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"inline_data": {
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"data": base64.b64encode(fake_pcm_bytes).decode()
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}
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}
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]
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}
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}
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]
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}
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output_path = str(tmp_path / "test.wav")
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with patch("requests.post", return_value=resp):
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_generate_gemini_tts("Hi", output_path, {})
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data = (tmp_path / "test.wav").read_bytes()
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assert data[:4] == b"RIFF"
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def test_custom_base_url_env(self, tmp_path, monkeypatch, mock_gemini_response):
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from tools.tts_tool import _generate_gemini_tts
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monkeypatch.setenv("GEMINI_API_KEY", "test-key")
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monkeypatch.setenv("GEMINI_BASE_URL", "https://custom-gemini.example.com/v1beta")
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with patch("requests.post", return_value=mock_gemini_response) as mock_post:
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_generate_gemini_tts("Hi", str(tmp_path / "test.wav"), {})
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assert mock_post.call_args[0][0].startswith("https://custom-gemini.example.com/v1beta/")
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class TestGeminiInCheckRequirements:
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def test_gemini_api_key_satisfies_requirements(self, monkeypatch):
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from tools.tts_tool import check_tts_requirements
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# Strip everything else
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for key in (
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"ELEVENLABS_API_KEY",
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"OPENAI_API_KEY",
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"VOICE_TOOLS_OPENAI_KEY",
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"MINIMAX_API_KEY",
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"XAI_API_KEY",
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"MISTRAL_API_KEY",
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"GOOGLE_API_KEY",
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):
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monkeypatch.delenv(key, raising=False)
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monkeypatch.setenv("GEMINI_API_KEY", "k")
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# Force edge_tts import to fail so we actually hit the gemini check
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import builtins
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real_import = builtins.__import__
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def fake_import(name, *args, **kwargs):
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if name == "edge_tts":
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raise ImportError("simulated")
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return real_import(name, *args, **kwargs)
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with patch("builtins.__import__", side_effect=fake_import):
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assert check_tts_requirements() is True
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