[perf] Minicpm o4.5 optimization (#5228)

Signed-off-by: R2-Y <ruiruyang2@gmail.com>
Co-authored-by: Sy03 <1370724210@qq.com>

tests/examples/online_serving/test_minicpmo_streaming.py

@@ -0,0 +1,29 @@
+import base64
+import io
+import runpy
+import wave
+from pathlib import Path
+
+import pytest
+
+pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
+
+
+def test_append_wav_chunk_extracts_pcm_frames() -> None:
+    example = Path(__file__).parents[3] / "examples" / "online_serving" / "minicpmo" / "streaming_chat_completion.py"
+    append_wav_chunk = runpy.run_path(example)["append_wav_chunk"]
+    encoded_buffer = io.BytesIO()
+    with wave.open(encoded_buffer, "wb") as wav:
+        wav.setnchannels(1)
+        wav.setsampwidth(2)
+        wav.setframerate(24000)
+        wav.writeframes(b"\x01\x02\x03\x04")
+
+    pcm_parts: list[bytes] = []
+    audio_format = append_wav_chunk(
+        base64.b64encode(encoded_buffer.getvalue()).decode(),
+        pcm_parts,
+    )
+
+    assert audio_format == (1, 2, 24000)
+    assert pcm_parts == [b"\x01\x02\x03\x04"]