[Feature] Streaming video input with EVS frame filtering (RFC #2201 Phase 2-4) (#2342)

Signed-off-by: Sy03 <1370724210@qq.com>
Co-authored-by: shimei.jmh <shimei.jmh@taobao.com>
Co-authored-by: SYLAR <125541396+lishunyang12@users.noreply.github.com>

tests/entrypoints/openai_api/conftest_video.py

@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+"""Shared test helpers for video streaming tests."""
+
+from __future__ import annotations
+
+import io
+
+import pytest
+
+np = pytest.importorskip("numpy", reason="numpy required for video stream tests")
+PIL = pytest.importorskip("PIL", reason="Pillow required for video stream tests")
+from PIL import Image  # noqa: E402
+
+
+def make_jpeg(r: int = 128, g: int = 128, b: int = 128, size: int = 64) -> bytes:
+    """Create a solid-colour JPEG image."""
+    img = Image.new("RGB", (size, size), (r, g, b))
+    buf = io.BytesIO()
+    img.save(buf, format="JPEG", quality=95)
+    return buf.getvalue()
+
+
+def make_gradient_jpeg(seed: int, size: int = 64) -> bytes:
+    """Create a random-gradient JPEG that varies based on *seed*."""
+    rng = np.random.RandomState(seed)
+    arr = rng.randint(0, 256, (size, size, 3), dtype=np.uint8)
+    img = Image.fromarray(arr, "RGB")
+    buf = io.BytesIO()
+    img.save(buf, format="JPEG", quality=95)
+    return buf.getvalue()