expose transcript info from stream_builder

whisper_fastapi.py

@@ -7,7 +7,7 @@ import io
 import hashlib
 import argparse
 import uvicorn
-from typing import Annotated, Any, BinaryIO, Literal, Generator
+from typing import Annotated, Any, BinaryIO, Literal, Generator, Tuple, Iterable
 from fastapi import (
     File,
     HTTPException,
@@ -21,6 +21,7 @@ from fastapi import (
 from fastapi.middleware.cors import CORSMiddleware
 from src.whisper_ctranslate2.whisper_ctranslate2 import Transcribe
 from src.whisper_ctranslate2.writers import format_timestamp
+from faster_whisper.transcribe import Segment, TranscriptionInfo
 import opencc
 from prometheus_fastapi_instrumentator import Instrumentator
 
@@ -116,7 +117,7 @@ def stream_builder(
     vad_filter: bool,
     language: str | None,
     initial_prompt: str = "",
-):
+) -> Tuple[Iterable[Segment], TranscriptionInfo]:
     segments, info = transcriber.model.transcribe(
         audio=audio,
         language=language,
@@ -127,16 +128,19 @@ def stream_builder(
         "Detected language '%s' with probability %f"
         % (info.language, info.language_probability)
     )
-    last_pos = 0
-    with tqdm.tqdm(total=info.duration, unit="seconds", disable=True) as pbar:
-        for segment in segments:
-            start, end, text = segment.start, segment.end, segment.text
-            pbar.update(end - last_pos)
-            last_pos = end
-            data = segment._asdict()
-            data["total"] = info.duration
-            data["text"] = ccc.convert(data["text"])
-            yield data
+    def wrap():
+        last_pos = 0
+        with tqdm.tqdm(total=info.duration, unit="seconds", disable=True) as pbar:
+            for segment in segments:
+                start, end, text = segment.start, segment.end, segment.text
+                pbar.update(end - last_pos)
+                last_pos = end
+                data = segment._asdict()
+                data["total"] = info.duration
+                data["text"] = ccc.convert(data["text"])
+                yield data
+    
+    return wrap(), info
 
 
 @app.websocket("/k6nele/status")
@@ -293,7 +297,7 @@ async def transcription(
     """
 
     # timestamp as filename, keep original extension
-    generator = stream_builder(
+    generator, info = stream_builder(
         audio=io.BytesIO(file.file.read()),
         task=task,
         vad_filter=vad_filter,