[Model] Add IndexTTS2 text-to-speech support (#3838)

Signed-off-by: BeatSeat <wendavid552@gmail.com>
Signed-off-by: David <david@podcast.ai>
Signed-off-by: wendavid552 <wendavid552@gmail.com>
Signed-off-by: WenDavid <davidzhangcf@foxmail.com>

tests/e2e/online_serving/test_indextts2.py

@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+"""E2E online serving tests for IndexTTS2 via /v1/audio/speech endpoint.
+
+Two-stage pipeline: GPT AR → S2Mel + BigVGAN. Output is 22050 Hz mono WAV.
+Covers: basic TTS and the speech endpoint's stream=True compatibility path.
+"""
+
+from __future__ import annotations
+
+import os
+
+os.environ["VLLM_WORKER_MULTIPROC_METHOD"] = "spawn"
+
+import pytest
+
+from tests.helpers.mark import hardware_test
+from tests.helpers.media import load_test_audio_data_url
+from tests.helpers.runtime import OmniServerParams
+from tests.helpers.stage_config import get_deploy_config_path
+
+pytestmark = [pytest.mark.advanced_model, pytest.mark.tts]
+
+MODEL = "IndexTeam/IndexTTS-2"
+
+REF_AUDIO_URL = load_test_audio_data_url("indextts2/ref_audio.wav")
+
+tts_server_params = [
+    pytest.param(
+        OmniServerParams(
+            model=MODEL,
+            stage_config_path=get_deploy_config_path("indextts2.yaml"),
+            server_args=["--disable-log-stats"],
+        ),
+        id="indextts2",
+    )
+]
+
+
+@hardware_test(res={"cuda": "L4"}, num_cards=1)
+@pytest.mark.parametrize("omni_server", tts_server_params, indirect=True)
+def test_basic_english(omni_server, openai_client) -> None:
+    """
+    Basic English TTS: text + ref_audio, no emotion.
+    Deploy Setting: default yaml
+    Input Modal: text + reference audio
+    Output Modal: audio (22050 Hz, WAV)
+    Input Setting: stream=False
+    """
+    request_config = {
+        "model": omni_server.model,
+        "input": "Hello, this is a voice cloning demo.",
+        "stream": False,
+        "response_format": "wav",
+        "ref_audio": REF_AUDIO_URL,
+        "min_audio_bytes": 1024,
+    }
+    openai_client.send_audio_speech_request(request_config)
+
+
+@hardware_test(res={"cuda": "L4"}, num_cards=1)
+@pytest.mark.parametrize("omni_server", tts_server_params, indirect=True)
+def test_streaming(omni_server, openai_client) -> None:
+    """
+    stream=True compatibility: IndexTTS2 itself is non-async-chunking, but the
+    OpenAI speech endpoint should still accept the streaming request path and
+    return a valid PCM response.
+
+    Deploy Setting: default yaml
+    Input Modal: text + reference audio
+    Output Modal: audio (22050 Hz, PCM)
+    Input Setting: stream=True
+    """
+    request_config = {
+        "model": omni_server.model,
+        "input": "Hello, this is a voice cloning demo.",
+        "stream": True,
+        "response_format": "pcm",
+        "ref_audio": REF_AUDIO_URL,
+        "min_audio_bytes": 1024,
+    }
+    openai_client.send_audio_speech_request(request_config)