214 lines
6.7 KiB
Python
214 lines
6.7 KiB
Python
import logging
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import os
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import stat
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import sys
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import tempfile
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from contextlib import asynccontextmanager
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from pathlib import Path
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from fastapi import FastAPI, Query, Request, HTTPException
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.responses import StreamingResponse, FileResponse
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import ffmpeg
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from routers import transcribe, export, ai, captions, audio
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logging.basicConfig(level=logging.INFO)
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logger = logging.getLogger(__name__)
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# Dev log file — keep outside workspace to avoid dev watcher reload loops.
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DEV_LOG_PATH = Path(
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os.environ.get("TALKEDIT_DEV_LOG_PATH", str(Path(tempfile.gettempdir()) / "talkedit-webview.log"))
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)
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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logger.info("AI Video Editor backend starting up")
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yield
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logger.info("AI Video Editor backend shutting down")
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app = FastAPI(
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title="AI Video Editor Backend",
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version="0.1.0",
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lifespan=lifespan,
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)
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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expose_headers=["Content-Range", "Accept-Ranges", "Content-Length"],
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)
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app.include_router(transcribe.router)
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app.include_router(export.router)
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app.include_router(ai.router)
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app.include_router(captions.router)
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app.include_router(audio.router)
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MIME_MAP = {
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".mp4": "video/mp4",
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".mkv": "video/x-matroska",
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".mov": "video/quicktime",
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".avi": "video/x-msvideo",
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".webm": "video/webm",
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".m4a": "audio/mp4",
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".wav": "audio/wav",
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".mp3": "audio/mpeg",
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".flac": "audio/flac",
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}
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@app.get("/file")
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async def serve_local_file(request: Request, path: str = Query(...), format: str = Query(None)):
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"""Stream a local file with HTTP Range support (required for video seeking).
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Optionally transcode audio files to MP3 for better browser compatibility."""
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file_path = Path(path)
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if not file_path.is_file():
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logger.warning(f"[serve_file] File not found: {path}")
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raise HTTPException(status_code=404, detail=f"File not found: {path}")
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file_size = file_path.stat().st_size
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original_ext = file_path.suffix.lower()
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# Check if we should transcode this file
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should_transcode = (
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original_ext == '.wav' and
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(format == 'mp3' or file_size > 10 * 1024 * 1024) # Transcode WAV if > 10MB or explicitly requested
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)
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if should_transcode:
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logger.info(f"[serve_file] Transcoding {file_path.name} to MP3 (size: {file_size})")
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# Create cache directory
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cache_dir = Path(__file__).parent / "cache"
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cache_dir.mkdir(exist_ok=True)
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# Create cache filename
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import hashlib
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file_hash = hashlib.md5(str(file_path).encode()).hexdigest()
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cache_path = cache_dir / f"{file_hash}.mp3"
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# Check if cached version exists
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if not cache_path.exists():
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logger.info(f"[serve_file] Creating cached MP3: {cache_path}")
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try:
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# Transcode to MP3 using ffmpeg
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(
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ffmpeg
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.input(str(file_path))
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.output(str(cache_path), acodec='libmp3lame', ab='128k')
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.run(overwrite_output=True, quiet=True)
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)
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except ffmpeg.Error as e:
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logger.error(f"[serve_file] Transcoding failed: {e}")
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# Fall back to original file
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cache_path = file_path
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else:
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logger.info(f"[serve_file] Transcoding completed: {cache_path}")
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else:
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logger.info(f"[serve_file] Using cached MP3: {cache_path}")
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# Use the transcoded file
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file_path = cache_path
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file_size = file_path.stat().st_size
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content_type = "audio/mpeg"
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else:
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content_type = MIME_MAP.get(original_ext, "application/octet-stream")
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range_header = request.headers.get("range")
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logger.info(
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f"[serve_file] Serving {file_path.name} | size={file_size} | "
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f"type={content_type} | range={range_header or 'none'} | transcoded={should_transcode}"
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)
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if content_type == "application/octet-stream":
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logger.warning(
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f"[serve_file] Unknown MIME type for extension '{file_path.suffix}' — "
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f"browser may fail to decode audio/video for '{file_path.name}'"
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)
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if file_size == 0:
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logger.error(f"[serve_file] File is empty: {path}")
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raise HTTPException(status_code=422, detail=f"File is empty: {path}")
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if range_header:
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try:
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range_spec = range_header.replace("bytes=", "")
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range_start_str, range_end_str = range_spec.split("-")
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range_start = int(range_start_str) if range_start_str else 0
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range_end = int(range_end_str) if range_end_str else file_size - 1
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range_end = min(range_end, file_size - 1)
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except (ValueError, TypeError) as e:
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logger.error(f"[serve_file] Malformed Range header '{range_header}': {e}")
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raise HTTPException(status_code=416, detail=f"Invalid Range header: {range_header}")
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content_length = range_end - range_start + 1
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def iter_range():
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with open(file_path, "rb") as f:
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f.seek(range_start)
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remaining = content_length
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while remaining > 0:
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chunk = f.read(min(65536, remaining))
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if not chunk:
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break
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remaining -= len(chunk)
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yield chunk
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return StreamingResponse(
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iter_range(),
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status_code=206,
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media_type=content_type,
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headers={
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"Content-Range": f"bytes {range_start}-{range_end}/{file_size}",
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"Accept-Ranges": "bytes",
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"Content-Length": str(content_length),
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},
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)
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def iter_file():
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with open(file_path, "rb") as f:
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while chunk := f.read(65536):
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yield chunk
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return StreamingResponse(
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iter_file(),
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media_type=content_type,
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headers={
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"Accept-Ranges": "bytes",
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"Content-Length": str(file_size),
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},
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)
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@app.get("/health")
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async def health():
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return {"status": "ok"}
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import datetime
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@app.post("/dev/log")
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async def dev_log(request: Request):
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data = await request.json()
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level = data.get("level", "log")
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msg = str(data.get("message", ""))
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args = [str(a) for a in data.get("args", [])]
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ts = datetime.datetime.now().strftime("%H:%M:%S.%f")[:-3]
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line = f"[{ts}] [{level.upper():5}] {msg}"
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if args:
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line += " " + " ".join(args)
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line += "\n"
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DEV_LOG_PATH.parent.mkdir(parents=True, exist_ok=True)
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with open(DEV_LOG_PATH, "a") as f:
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f.write(line)
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return {"ok": True, "path": str(DEV_LOG_PATH)}
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