ASCILINE/stream_server.py

"""
stream_server.py
================
Streams the core Video-to-ASCII engine to the web via HTTP/WebSocket.
Dependencies: pip install fastapi uvicorn websockets

Priority Order:
  1. --playlist playlist.json  → JSON file (per-video vol, mode, path)
  2. --folder ./videos         → folder scan (filesystem order, not alphabetical)
  3. positional video arg      → single video (legacy behavior)
"""

import asyncio
import subprocess
import json
import numpy as np
import cv2
from fastapi import FastAPI, WebSocket, WebSocketDisconnect, HTTPException
from fastapi.responses import HTMLResponse, StreamingResponse, Response
from fastapi.staticfiles import StaticFiles
import uvicorn
import os
from websockets.exceptions import ConnectionClosed

# Import the existing engine (ascii_video_player2.py)
from ascii_video_player2 import VideoDecoder, AsciiMapper

app = FastAPI()

MIN_COLS = 1
MAX_COLS = 1200
MIN_ROWS = 0
MAX_ROWS = 800
MAX_CELLS = 500_000
MIN_VOL = 0
MAX_VOL = 5
VALID_MODES = {1, 2, 3, 4, 5}
SUPPORTED_VIDEO_EXTENSIONS = (".mp4", ".mkv", ".avi", ".mov", ".webm")


def field_label(context: str, name: str) -> str:
    return f"{context}: {name}" if context else name


def validate_int_range(name: str, value: object, min_value: int, max_value: int, context: str = "") -> int:
    """Validate plain integers, excluding bool which is an int subclass."""
    if isinstance(value, bool) or not isinstance(value, int):
        raise ValueError(f"{field_label(context, name)} must be an integer")
    if value < min_value or value > max_value:
        raise ValueError(f"{field_label(context, name)} must be between {min_value} and {max_value}")
    return value


def validate_bool(name: str, value: object, context: str = "") -> bool:
    if not isinstance(value, bool):
        raise ValueError(f"{field_label(context, name)} must be true or false")
    return value


def validate_dimensions(cols: int, rows: int, context: str = "") -> None:
    validate_int_range("cols", cols, MIN_COLS, MAX_COLS, context)
    validate_int_range("rows", rows, MIN_ROWS, MAX_ROWS, context)
    if rows > 0 and cols * rows > MAX_CELLS:
        prefix = f"{context}: " if context else ""
        raise ValueError(f"{prefix}grid size {cols}x{rows} exceeds the {MAX_CELLS} cell limit")


def validate_queue_entry(entry: dict, index: int | None = None) -> dict:
    context = f"playlist entry {index + 1}" if index is not None else "queue entry"
    if not isinstance(entry, dict):
        raise ValueError(f"{context} must be an object")

    normalized = dict(entry)
    video = normalized.get("video")
    if not isinstance(video, str) or not video.strip():
        raise ValueError(f"{field_label(context, 'video')} must be a non-empty string")
    normalized["video"] = video

    normalized["mode"] = validate_int_range("mode", normalized.get("mode"), 1, 5, context)
    if normalized["mode"] not in VALID_MODES:
        raise ValueError(f"{field_label(context, 'mode')} must be one of 1, 2, 3, 4, 5")

    normalized["pixel"] = validate_bool("pixel", normalized.get("pixel"), context)
    if normalized["pixel"] and normalized["mode"] == 1:
        raise ValueError(f"{context}: pixel mode requires color mode 2-5")

    normalized["vol"] = validate_int_range("vol", normalized.get("vol"), MIN_VOL, MAX_VOL, context)
    normalized["cols"] = validate_int_range("cols", normalized.get("cols"), MIN_COLS, MAX_COLS, context)
    normalized["rows"] = validate_int_range("rows", normalized.get("rows"), MIN_ROWS, MAX_ROWS, context)
    validate_dimensions(normalized["cols"], normalized["rows"], context)
    return normalized


def normalize_queue_entry(raw_entry: dict, args, index: int | None = None) -> dict:
    context = f"playlist entry {index + 1}" if index is not None else "queue entry"
    if not isinstance(raw_entry, dict):
        raise ValueError(f"{context} must be an object")

    entry = dict(raw_entry)
    entry.setdefault("mode", args.mode)
    entry.setdefault("vol", args.vol)
    entry.setdefault("pixel", args.pixel)

    is_pixel = entry.get("pixel") is True
    default_cols = args.cols if args.cols is not None else (450 if is_pixel else 200)
    entry.setdefault("cols", default_cols)
    entry.setdefault("rows", args.rows)

    if isinstance(entry.get("video"), str):
        entry["video"] = resolve_video_path(entry["video"])

    return validate_queue_entry(entry, index)


def get_video_dimensions(path: str) -> tuple[int, int]:
    """Quickly probe a video file to get (width, height) without decoding frames."""
    cap = cv2.VideoCapture(path)
    if not cap.isOpened():
        raise FileNotFoundError(f"Could not open video file: {path!r}")
    w = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
    h = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
    cap.release()
    return w, h


def calc_auto_rows(cols: int, vid_w: int, vid_h: int, pixel_mode: bool) -> int:
    """
    Calculate rows from video aspect ratio.
    ASCII mode: characters are ~2x taller than wide, so divide by 2.
    Pixel mode: cells are square (CSS stretches), no correction needed.
    """
    ratio = vid_w / max(vid_h, 1)
    if pixel_mode:
        return max(1, round(cols / ratio))
    else:
        return max(1, round(cols / ratio / 2))

# Serve static files (style.css, app.js) from the project directory
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
app.mount("/static", StaticFiles(directory=BASE_DIR), name="static")

def get_html_content():
    html_path = os.path.join(os.path.dirname(__file__), "index.html")
    with open(html_path, "r", encoding="utf-8") as f:
        return f.read()

def resolve_video_path(video: str) -> str:
    """
    Resolves a video path by checking multiple locations in order:
      1. As-is (absolute or relative to CWD)
      2. Inside the project root (BASE_DIR)
      3. Inside BASE_DIR/videos/ subfolder
    Returns the first path that exists, or the original string if none found.
    """
    candidates = [
        video,
        os.path.join(BASE_DIR, video),
        os.path.join(BASE_DIR, "videos", os.path.basename(video)),
    ]
    for path in candidates:
        if os.path.exists(path):
            return path
    return video  # Return original; error will be caught during playback

def load_playlist(playlist_path: str) -> list[dict]:
    """Loads playlist from a JSON file and resolves all video paths."""
    with open(playlist_path, "r", encoding="utf-8") as f:
        items = json.load(f)
    if not isinstance(items, list):
        raise ValueError("playlist must be a JSON array")
    return items

def load_folder(folder_path: str, default_mode: int, default_vol: int) -> list[dict]:
    """
    Scans a folder for video files in filesystem order (top to bottom,
    as they appear in the directory — not alphabetically sorted).
    """
    entries = []
    with os.scandir(folder_path) as it:
        for entry in it:
            if entry.is_file() and entry.name.lower().endswith(SUPPORTED_VIDEO_EXTENSIONS):
                entries.append({
                    "video": entry.path,
                    "mode":  default_mode,
                    "vol":   default_vol
                })
    # Filesystem order (no sort applied)
    return entries

def build_queue(args) -> list[dict]:
    """
    Builds the video queue based on argument priority:
      1. --playlist JSON file
      2. --folder directory
      3. Single positional video argument
    """
    if args.playlist:
        print(f"[PLAYLIST] Loading: {args.playlist}")
        items = load_playlist(args.playlist)
        return [normalize_queue_entry(item, args, index=i) for i, item in enumerate(items)]

    if args.folder:
        print(f"[FOLDER] Scanning: {args.folder}")
        items = load_folder(args.folder, args.mode, args.vol)
        return [normalize_queue_entry(item, args, index=i) for i, item in enumerate(items)]

    # Legacy: single video argument
    return [normalize_queue_entry({"video": args.video}, args)]


# ── APP STATE ──────────────────────────────────────────────
# Queue is stored in app.state so the WebSocket endpoint can read it.
# current_index tracks which video is playing.
# loop flag controls infinite playback.
# ──────────────────────────────────────────────────────────

@app.get("/")
async def root():
    """Serves the Frontend (HTML/JS/CSS) file to the client."""
    return HTMLResponse(get_html_content())


@app.get("/audio")
async def audio_stream():
    idx = getattr(app.state, "current_index", 0)
    return audio_response_for_index(idx)


@app.get("/audio/{queue_index}")
async def audio_stream_for_index(queue_index: int):
    return audio_response_for_index(queue_index)


def audio_response_for_index(queue_index: int):
    """
    Extracts and streams audio from the currently active video entry.
    Server-side volume control via the entry's 'vol' field (0-5 scale).
      0 = Muted (FFmpeg never runs)
      1 = Normal (1.0x)
      5 = Double  (2.0x)
    """
    queue = getattr(app.state, "queue", [])
    if queue_index < 0 or queue_index >= len(queue):
        raise HTTPException(status_code=404, detail="Audio entry not found")
    entry = queue[queue_index]

    vol_level  = entry.get("vol", 1)
    video_path = entry.get("video", "video.mp4")

    # vol 0 → skip audio entirely, no FFmpeg process
    if vol_level <= 0:
        return Response(status_code=204)

    if not os.path.exists(video_path):
        raise HTTPException(status_code=404, detail="Video file not found")

    # Map 1-5 → 1.0x-2.0x FFmpeg volume
    ffmpeg_vol = 1.0 + (vol_level - 1) * 0.25

    def audio_generator():
        process = subprocess.Popen(
            [
                "ffmpeg",
                "-i", video_path,
                "-vn",
                "-filter:a", f"volume={ffmpeg_vol}",
                "-acodec", "libmp3lame",
                "-ab", "128k",
                "-ar", "44100",
                "-f", "mp3",
                "-loglevel", "quiet",
                "pipe:1"
            ],
            stdout=subprocess.PIPE,
            stderr=subprocess.DEVNULL
        )
        try:
            while True:
                chunk = process.stdout.read(4096)
                if not chunk:
                    break
                yield chunk
        finally:
            process.stdout.close()
            process.wait()

    return StreamingResponse(
        audio_generator(),
        media_type="audio/mpeg",
        headers={"Accept-Ranges": "bytes"}
    )


@app.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket):
    """
    Streams ASCII frames for every video in the queue.
    Advances to the next entry automatically when a video ends.
    Loops back to the start if --loop is set.
    """
    await websocket.accept()

    queue = getattr(app.state, "queue", [])
    loop  = getattr(app.state, "loop", False)

    if not queue:
        await websocket.send_text("Error: No video in queue!")
        await websocket.close()
        return

    queue_index = 0  # local index; advances through the queue

    try:
        while True:
            entry      = queue[queue_index]
            video_path = entry["video"]
            render_mode= entry["mode"]
            pixel_mode = entry.get("pixel", False)
            cols       = entry.get("cols", 200)
            rows_cfg   = entry.get("rows", 0)

            # IMPORTANT: Update current_index BEFORE sending INIT so that
            # /status can report progress. Audio uses the per-client queue index
            # sent in INIT rather than this global display value.
            app.state.current_index = queue_index

            print(f"[PLAYING] ({queue_index + 1}/{len(queue)}) {video_path}  "
                  f"mode={render_mode}  pixel={pixel_mode}  vol={entry['vol']}")

            # ── Auto-calculate rows if not specified ──
            try:
                vid_w, vid_h = get_video_dimensions(video_path)
            except FileNotFoundError:
                await websocket.send_text(f"Error: '{video_path}' not found!")
                queue_index += 1
                if queue_index >= len(queue):
                    if loop:
                        queue_index = 0
                    else:
                        break
                continue

            if rows_cfg == 0:
                rows = calc_auto_rows(cols, vid_w, vid_h, pixel_mode)
                print(f"[AUTO] {vid_w}x{vid_h} → grid {cols}x{rows}")
            else:
                rows = rows_cfg

            try:
                validate_dimensions(cols, rows)
            except ValueError as exc:
                await websocket.send_text(f"Error: {exc}")
                queue_index += 1
                if queue_index >= len(queue):
                    if loop:
                        queue_index = 0
                    else:
                        break
                continue

            try:
                decoder = VideoDecoder(video_path, cols, rows, skip_gray=pixel_mode)
            except FileNotFoundError:
                await websocket.send_text(f"Error: '{video_path}' not found!")
                queue_index += 1
                if queue_index >= len(queue):
                    if loop:
                        queue_index = 0
                    else:
                        break
                continue

            mapper       = AsciiMapper()
            source_fps   = decoder.fps
            MAX_FPS      = 30
            char_byte_lut= np.array([ord(c) for c in mapper._lut], dtype=np.uint8)
            qb           = {5: 0, 4: 2, 3: 3, 2: 5}.get(render_mode, 0)

            # ── FPS DECIMATION ──
            # If source > 30 FPS, skip every Nth frame using grab() (no decode).
            # This halves CPU load for 60 FPS sources.
            if source_fps > MAX_FPS:
                skip_n = round(source_fps / MAX_FPS)  # e.g. 60/30 = 2
                effective_fps = source_fps / skip_n
            else:
                skip_n = 1
                effective_fps = source_fps
            frame_t = 1.0 / effective_fps

            await websocket.send_text(f"INIT:{effective_fps}:{render_mode}:{cols}:{rows}:{int(pixel_mode)}:{queue_index}")
            if skip_n > 1:
                print(f"[FPS CAP] {source_fps} FPS → {effective_fps} FPS (skip every {skip_n} frames)")

            frame_buf = np.empty((rows, cols, 4), dtype=np.uint8) if render_mode > 1 else None

            import struct
            start_time = asyncio.get_event_loop().time()
            frame_index = 0

            # Pre-allocate send buffer WITH header space to avoid per-frame concat
            if pixel_mode:
                # Zero-Copy Pixel: 4-byte header + raw BGR (3 bytes per pixel)
                pixel_send_buf = bytearray(4 + rows * cols * 3)
            elif render_mode > 1:
                # ASCII Color: 4-byte header + [char,R,G,B] per pixel
                ascii_send_buf = bytearray(4 + rows * cols * 4)

            raw_frame_num = 0
            try:
                while True:
                    # ── FPS DECIMATION via grab() ──
                    # For 60→30 fps: grab (skip) 1 frame, then decode 1 frame.
                    # grab() is ~10x faster than read() because it skips decoding.
                    for _ in range(skip_n - 1):
                        if not decoder.grab():
                            break  # EOF reached during skip

                    try:
                        gray_frame, bgr_frame = next(decoder)
                    except StopIteration:
                        break

                    if pixel_mode:
                        # ── ZERO-COPY PIXEL MODE ──
                        # Send raw BGR bytes directly. No RGB conversion,
                        # no dummy 0xDB char, no intermediate numpy copies.
                        bgr_bytes = bgr_frame.tobytes()
                        struct.pack_into(">I", pixel_send_buf, 0, frame_index)
                        pixel_send_buf[4:] = bgr_bytes
                        await websocket.send_bytes(bytes(pixel_send_buf))
                    else:
                        indices = np.floor_divide(gray_frame, max(1, 256 // mapper._n))
                        np.clip(indices, 0, mapper._n - 1, out=indices)

                        if render_mode == 1:
                            char_matrix = mapper._lut[indices]
                            lines = [''.join(row) for row in char_matrix]
                            await websocket.send_text(f"{frame_index}\n" + '\n'.join(lines))
                        else:
                            char_codes = char_byte_lut[indices]
                            rgb = bgr_frame[:, :, ::-1]
                            if qb > 0:
                                rgb = (rgb >> qb) << qb
                            frame_buf[:, :, 0] = char_codes
                            frame_buf[:, :, 1:] = rgb
                            struct.pack_into(">I", ascii_send_buf, 0, frame_index)
                            ascii_send_buf[4:] = frame_buf.tobytes()
                            await websocket.send_bytes(bytes(ascii_send_buf))

                    elapsed = asyncio.get_event_loop().time() - start_time
                    wait = (frame_index * frame_t) - elapsed
                    if wait > 0:
                        await asyncio.sleep(wait)
                    
                    frame_index += 1

            finally:
                decoder.release()

            # Video finished → advance queue
            queue_index += 1
            if queue_index >= len(queue):
                if loop:
                    print("[LOOP] Restarting queue from the beginning.")
                    queue_index = 0
                else:
                    print("[DONE] All videos finished.")
                    break

    except (WebSocketDisconnect, ConnectionClosed):
        print("Client disconnected from the stream.")


ASCII_LOGO = "\033[36m" + r"""
    _    ____   ____ ___ _     ___ _   _ _____ 
   / \  / ___| / ___|_ _| |   |_ _| \ | | ____|
  / _ \ \___ \| |    | || |    | ||  \| |  _|  
 / ___ \ ___) | |___ | || |___ | || |\  | |___ 
/_/   \_\____/ \____|___|_____|___|_| \_|_____|
""" + "\033[0m"

HELP_TEXT = "\033[1;37m" + """
╔═══════════════════════════════════════════════════╗
║               ASCILINE  —  COMMANDS               ║
╠═══════════════════════════════════════════════════╣
║                                                   ║
║  \033[36m/help\033[1;37m      Show this help message               ║
║  \033[36m/status\033[1;37m    Show current server & playback info  ║
║  \033[36m/quit\033[1;37m      Stop the server and exit             ║
║                                                   ║
╠═══════════════════════════════════════════════════╣
║             CLI LAUNCH OPTIONS                    ║
╠═══════════════════════════════════════════════════╣
║                                                   ║
║  \033[33m─── Source ───\033[1;37m                                  ║
║  \033[32mvideo\033[1;37m          Path to a single video file      ║
║  \033[32m--playlist\033[1;37m     JSON playlist file               ║
║  \033[32m--folder\033[1;37m       Play all videos in a folder      ║
║                                                   ║
║  \033[33m─── Render ───\033[1;37m                                  ║
║  \033[32m--mode\033[1;37m  \033[35m1-5\033[1;37m    Color quality                    ║
║     1=B&W  2=512c  3=32Kc  4=262Kc  5=16M        ║
║  \033[32m--pixel\033[1;37m        Pixel block mode (with mode 2-5) ║
║  \033[32m--cols\033[1;37m  \033[35mN\033[1;37m      Grid columns  (default: 200)     ║
║  \033[32m--rows\033[1;37m  \033[35mN\033[1;37m      Grid rows     (default: auto)    ║
║                                                   ║
║  \033[33m─── Playback ───\033[1;37m                                ║
║  \033[32m--vol\033[1;37m   \033[35m0-5\033[1;37m    Volume (0=mute, 1=normal, 5=2x)  ║
║  \033[32m--loop\033[1;37m         Loop the playlist infinitely     ║
║                                                   ║
║  \033[33m─── Server ───\033[1;37m                                  ║
║  \033[32m--port\033[1;37m  \033[35mN\033[1;37m      Server port    (default: 8000)    ║
║                                                   ║
╚═══════════════════════════════════════════════════╝
""" + "\033[0m"


def print_status():
    """Prints current server status."""
    queue = getattr(app.state, "queue", [])
    idx   = getattr(app.state, "current_index", 0)
    loop  = getattr(app.state, "loop", False)
    cols  = getattr(app.state, "cols", 0)
    rows  = getattr(app.state, "rows", 0)

    print(f"\n\033[1;37m{'═'*55}\033[0m")
    print(f" \033[32m▶\033[0m \033[1mQueue\033[0m      : {len(queue)} video(s)")
    print(f" \033[32m▶\033[0m \033[1mNow Playing\033[0m: {idx + 1}/{len(queue)}")
    if queue and idx < len(queue):
        entry = queue[idx]
        px = ' \033[35m[PIXEL]\033[0m' if entry.get('pixel') else ''
        cols = entry.get('cols', cols)
        rows = entry.get('rows', rows)
        print(f" \033[32m▶\033[0m \033[1mVideo\033[0m      : \033[36m{entry['video']}\033[0m")
        print(f" \033[32m▶\033[0m \033[1mSettings\033[0m   : mode={entry['mode']}{px} vol={entry['vol']}")
    res_str = f"{cols}x{rows}" if rows > 0 else f"{cols}x(auto)"
    print(f" \033[32m▶\033[0m \033[1mResolution\033[0m : {res_str}")
    print(f" \033[32m▶\033[0m \033[1mLoop\033[0m       : {'ON' if loop else 'OFF'}")
    print(f"\033[1;37m{'═'*55}\033[0m\n")


def command_loop():
    """Interactive command listener — runs in main thread alongside uvicorn."""
    print(f" \033[90mType \033[36m/help\033[90m for available commands.\033[0m\n")
    while True:
        try:
            cmd = input().strip().lower()
            if cmd in ('/help', 'help'):
                print(HELP_TEXT)
            elif cmd in ('/status', 'status'):
                print_status()
            elif cmd in ('/quit', 'quit', 'exit'):
                print("\n \033[33m⏹  Shutting down ASCILINE...\033[0m\n")
                os._exit(0)
            elif cmd:
                print(f" \033[90mUnknown command: '{cmd}'. Type \033[36m/help\033[90m for options.\033[0m")
        except (EOFError, KeyboardInterrupt):
            print("\n \033[33m⏹  Shutting down ASCILINE...\033[0m\n")
            os._exit(0)


if __name__ == "__main__":
    import argparse
    import os
    import threading
    
    # Enable ANSI escape sequences on Windows
    os.system("")

    parser = argparse.ArgumentParser(
        description=f"{ASCII_LOGO}\nReal-Time ASCII Web Server\n"
                    "Stream local videos to your browser with high performance ASCII and Pixel rendering.",
        formatter_class=argparse.RawTextHelpFormatter
    )

    # ── Source ──
    src = parser.add_argument_group('\033[33mSource\033[0m')
    src.add_argument(
        "video",
        nargs="?",
        default="video.mp4",
        help="Single video file to stream"
    )
    src.add_argument(
        "--playlist",
        metavar="FILE",
        default=None,
        help="Path to a playlist JSON file\n"
             "  Format: [{\"video\": \"a.mp4\", \"mode\": 5, \"vol\": 3}, ...]"
    )
    src.add_argument(
        "--folder",
        metavar="DIR",
        default=None,
        help="Path to a folder; plays all videos in filesystem order"
    )

    # ── Render ──
    render = parser.add_argument_group('\033[33mRender\033[0m')
    render.add_argument(
        "--mode",
        type=int, choices=[1, 2, 3, 4, 5], default=1,
        help="Color quality: 1=B&W  2=512c  3=32Kc  4=262Kc  5=16M Ultra"
    )
    render.add_argument(
        "--pixel",
        action="store_true", default=False,
        help="Pixel mode: replaces ASCII characters with colored blocks (combine with --mode 2-5)"
    )
    render.add_argument("--cols", type=int, default=None, help="Grid columns (default: 200 for text, 450 for pixel)")
    render.add_argument("--rows", type=int, default=0,   help="Grid rows    (default: auto from video aspect ratio)")

    # ── Playback ──
    playback = parser.add_argument_group('\033[33mPlayback\033[0m')
    playback.add_argument(
        "--vol",
        type=int, default=1,
        help="Volume 0-5  (0=muted, 1=normal, 5=double)"
    )
    playback.add_argument("--loop", action="store_true", default=False, help="Loop the queue infinitely")

    # ── Server ──
    srv = parser.add_argument_group('\033[33mServer\033[0m')
    srv.add_argument("--port", type=int, default=8000, help="Server port (default: 8000)")

    args = parser.parse_args()

    # Validate: --pixel requires color mode (2-5)
    if args.pixel and args.mode == 1:
        print("[ERROR] --pixel requires a color mode (--mode 2-5). B&W mode is text-only.")
        exit(1)

    # Build the queue
    try:
        queue = build_queue(args)
    except ValueError as exc:
        print(f"[ERROR] {exc}")
        exit(1)

    if not queue:
        print("[ERROR] No videos found. Check your --playlist / --folder / video argument.")
        exit(1)

    # Save state
    app.state.queue         = queue
    app.state.current_index = 0
    app.state.loop          = args.loop
    global_default_cols     = args.cols if args.cols is not None else (450 if args.pixel else 200)
    app.state.cols          = global_default_cols
    app.state.rows          = args.rows

    # ── High FPS Warning ──
    high_fps_videos = []
    for entry in queue:
        cap = cv2.VideoCapture(entry['video'])
        if cap.isOpened():
            fps = cap.get(cv2.CAP_PROP_FPS)
            if fps > 35:  # Consider > 35 as high FPS
                high_fps_videos.append((entry['video'], fps))
        cap.release()

    if high_fps_videos:
        print("\n\033[1;33m[WARNING] High FPS Source(s) Detected:\033[0m")
        for vid, fps in high_fps_videos:
            print(f"  - \033[36m{vid}\033[0m is \033[1;31m{fps:.1f} FPS\033[0m")
        print("\033[33mASCILINE is optimized for 24-30 FPS cinematic playback.")
        print("High FPS videos will automatically be decimated to ~30 FPS,")
        print("but performance may still drop depending on the system's CPU.")
        print("For optimal performance, we recommend using 30 FPS source videos.\033[0m\n")
        
        while True:
            choice = input("\033[1mDo you want to continue anyway? (y/n): \033[0m").strip().lower()
            if choice == 'y':
                break
            elif choice == 'n':
                print("Exiting...")
                exit(0)

    # ── Startup Banner ──
    print(ASCII_LOGO)
    print(f"\033[1;37m{'═'*55}\033[0m")
    print(f" \033[32m▶\033[0m \033[1mQueue\033[0m     : {len(queue)} video(s)")
    print(f" \033[32m▶\033[0m \033[1mLoop\033[0m      : {'ON' if args.loop else 'OFF'}")
    res_str = f"{global_default_cols}x{args.rows}" if args.rows > 0 else f"{global_default_cols}x(auto)"
    print(f" \033[32m▶\033[0m \033[1mResolution\033[0m: {res_str}")
    print(f" \033[32m▶\033[0m \033[1mDefault\033[0m   : mode={args.mode} | pixel={'ON' if args.pixel else 'OFF'} | vol={args.vol}")
    print(f"\033[1;37m{'─'*55}\033[0m")
    for i, entry in enumerate(queue, 1):
        px = ' \033[35m[PIXEL]\033[0m' if entry.get('pixel') else ''
        print(f"  {i:2}. \033[36m{entry['video']}\033[0m  (mode={entry['mode']}{px} vol={entry['vol']})")
    print(f"\033[1;37m{'═'*55}\033[0m\n")
    print(f" \033[1;32m🚀 Server live →\033[0m \033[4;36mhttp://localhost:{args.port}\033[0m\n")

    # ── Run server in background thread, command loop in main thread ──
    server_thread = threading.Thread(
        target=uvicorn.run,
        args=(app,),
        kwargs={
            "host": "0.0.0.0",
            "port": args.port,
            "ws_ping_interval": None,
            "ws_ping_timeout": None,
            "log_level": "warning",
        },
        daemon=True
    )
    server_thread.start()
    command_loop()