FEATURE: adds automatic format detected to the frontend

web/backend/api/info.py

@@ -5,7 +5,12 @@ from fastapi import APIRouter, HTTPException
 from backend.config import settings
 from backend.services.file_manager import FileManager
 from backend.services.task_manager import task_manager
-from backend.ffmpeg import get_stream_info
+
+# Import core functions
+from audio_splitter.ffmpeg import get_stream_info, get_container_format, get_audio_codec
+from audio_splitter.formats import determine_default_format
+from audio_splitter.constants import FORMAT_INFO
+from audio_splitter.defaults import DEFAULT_FORMAT
 
 router = APIRouter(prefix="/api", tags=["info"])
 
@@ -13,7 +18,8 @@ router = APIRouter(prefix="/api", tags=["info"])
 @router.get("/info/{task_id}")
 async def get_task_info(task_id: str):
     """
-    Return stream information (has_audio, has_video, has_subtitle) for the uploaded file.
+    Return stream information (has_audio, has_video, has_subtitle, audio_codec)
+    for the uploaded file.
     """
     if not task_manager.has_task(task_id):
         raise HTTPException(status_code=404, detail=f"Task {task_id} not found")
@@ -33,3 +39,34 @@ async def get_task_info(task_id: str):
         }
     except Exception as e:
         raise HTTPException(status_code=500, detail=f"Failed to retrieve stream info: {str(e)}")
+
+
+@router.get("/info/recommended-format/{task_id}")
+async def get_recommended_format(task_id: str):
+    """
+    Return the recommended output format (container name) for the uploaded file,
+    based on its container and audio codec.
+    """
+    if not task_manager.has_task(task_id):
+        raise HTTPException(status_code=404, detail=f"Task {task_id} not found")
+
+    input_path = FileManager.get_input_path(task_id)
+    if not input_path or not input_path.exists():
+        raise HTTPException(status_code=404, detail="Input file not found")
+
+    try:
+        container = get_container_format(str(input_path))
+        codec = get_audio_codec(str(input_path))
+
+        fmt = determine_default_format(container, codec)
+
+        # Fallback if detection fails or format is unsupported
+        if fmt is None:
+            fmt = DEFAULT_FORMAT
+        if fmt not in FORMAT_INFO:
+            fmt = "mp3"  # ultimate fallback
+
+        return {"format": fmt}
+
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Failed to determine format: {str(e)}")