[Frontend] Add /v1/audio/transcriptions OpenAI API endpoint (#12909)

examples/online_serving/openai_transcription_client.py

@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: Apache-2.0
+from openai import OpenAI
+
+from vllm.assets.audio import AudioAsset
+
+mary_had_lamb = AudioAsset('mary_had_lamb').get_local_path()
+winning_call = AudioAsset('winning_call').get_local_path()
+
+# Modify OpenAI's API key and API base to use vLLM's API server.
+openai_api_key = "EMPTY"
+openai_api_base = "http://localhost:8000/v1"
+client = OpenAI(
+    api_key=openai_api_key,
+    base_url=openai_api_base,
+)
+with open(str(mary_had_lamb), "rb") as f:
+    transcription = client.audio.transcriptions.create(
+        file=f,
+        model="openai/whisper-large-v3",
+        language="en",
+        response_format="text",
+        temperature=0.0)
+    print("transcription result:", transcription)