[Core][Frontend] Unified Full-duplex Framework (#7413)

Signed-off-by: chickeyton <ngton2014@gmail.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/engine/duplex/test_duplex_audio.py

@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
+
+import base64
+
+import numpy as np
+import pytest
+
+from vllm_omni.engine.duplex.audio import convert_input_audio_with_rate
+
+pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
+
+
+def test_pcm16_input_conversion_is_pure_and_reports_target_rate():
+    pcm16 = np.array([-32768, 0, 32767], dtype="<i2").tobytes()
+    encoded = base64.b64encode(pcm16).decode("ascii")
+
+    converted, fmt, sample_rate = convert_input_audio_with_rate(
+        encoded,
+        "pcm16",
+        sample_rate_hz=16_000,
+    )
+
+    assert encoded == base64.b64encode(pcm16).decode("ascii")
+    assert fmt == "pcm_f32le"
+    assert sample_rate == 16_000
+    samples = np.frombuffer(base64.b64decode(converted), dtype="<f4")
+    assert np.allclose(samples, [-1.0, 0.0, 32767 / 32768])
+
+
+@pytest.mark.parametrize("sample_rate_hz", [8_000, 192_000])
+def test_pcm16_input_conversion_accepts_supported_sample_rate_boundaries(sample_rate_hz: int):
+    encoded = base64.b64encode(np.zeros(8, dtype="<i2").tobytes()).decode("ascii")
+
+    _, fmt, converted_rate = convert_input_audio_with_rate(
+        encoded,
+        "pcm16",
+        sample_rate_hz=sample_rate_hz,
+    )
+
+    assert fmt == "pcm_f32le"
+    assert converted_rate == 16_000
+
+
+@pytest.mark.parametrize("sample_rate_hz", [7_999, 192_001, 10**1000])
+def test_pcm16_input_conversion_rejects_sample_rates_outside_supported_range(sample_rate_hz: int):
+    encoded = base64.b64encode(np.zeros(8, dtype="<i2").tobytes()).decode("ascii")
+
+    with pytest.raises(ValueError, match="sample_rate_hz"):
+        convert_input_audio_with_rate(
+            encoded,
+            "pcm16",
+            sample_rate_hz=sample_rate_hz,
+        )