1 files changed, 253 insertions, 0 deletions
diff --git a/opt/obsproxy/server.py b/opt/obsproxy/server.py
new file mode 100755
index 0000000..8191d30
--- /dev/null
+++ b/opt/obsproxy/server.py
@@ -0,0 +1,253 @@
+#!/usr/bin/env python3
+from dotenv import load_dotenv
+import os
+import secrets
+import subprocess
+import threading
+import shutil
+from pathlib import Path
+from flask import Flask, request, send_from_directory
+import logging
+import atexit
+
+# Setup Flask and load environment variables
+app = Flask(__name__)
+load_dotenv()
+
+# Configuration
+INGEST_PSK = os.environ.get('OBS_STREAM_KEY')
+DASH_SEGMENT_TIME = float(os.environ.get('DASH_SEGMENT_TIME', '1'))
+DASH_FRAGMENT_TIME = float(os.environ.get('DASH_FRAGMENT_TIME', '0.5'))
+BASE_DIR = Path(os.environ.get('STREAM_DIR', '/var/www/streams'))
+SERVER_DOMAIN = os.environ.get('SERVER_DOMAIN', 'yummers.dev')
+STREAM_HEX = secrets.token_hex(16)
+STREAM_PATH = BASE_DIR / 'live' / STREAM_HEX
+
+# Setup logging
+logging.basicConfig(
+    level=getattr(logging, os.environ.get('LOG_LEVEL', 'INFO')),
+    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
+)
+logger = logging.getLogger('obs_proxy')
+
+# Global state
+stream_active = False
+ffmpeg_process = None
+
+# Validate configuration
+if not INGEST_PSK:
+    logger.error("STREAM_PSK is not set")
+    exit(1)
+
+# Create required directories
+BASE_DIR.mkdir(parents=True, exist_ok=True)
+STREAM_PATH.mkdir(parents=True, exist_ok=True)
+
+def reset_stream_path():
+    """Ensure the live stream directory is empty and ready."""
+    shutil.rmtree(STREAM_PATH, ignore_errors=True)
+    STREAM_PATH.mkdir(parents=True, exist_ok=True)
+
+
+def start_ffmpeg_process():
+    """Start FFmpeg process to convert RTMP ingest into low-latency DASH."""
+    global ffmpeg_process, stream_active
+
+    reset_stream_path()
+    logger.info(f"Stream directory ready at {STREAM_PATH}")
+
+    # Sanity check that we can write to the path before spawning ffmpeg
+    try:
+        test_file = STREAM_PATH / "write_test.txt"
+        with open(test_file, "w", encoding="utf-8") as probe:
+            probe.write("ok")
+        if test_file.exists():
+            test_file.unlink()
+    except Exception as exc:  # pragma: no cover - best effort logging
+        logger.error(f"Could not write to stream directory: {exc}")
+
+    command = [
+        'ffmpeg',
+        '-nostdin',
+        '-loglevel', 'warning',
+        '-i', f'rtmp://localhost/live/{INGEST_PSK}',
+        '-map', '0:v:0?',
+        '-map', '0:a:0?',
+        '-c:v', 'copy',
+        '-c:a', 'aac', '-b:a', '192k',
+        '-f', 'dash',
+        '-seg_duration', str(DASH_SEGMENT_TIME),
+        '-frag_duration', str(DASH_FRAGMENT_TIME),
+        '-window_size', '6',
+        '-extra_window_size', '10',
+        '-remove_at_exit', '1',
+        '-streaming', '1',
+        '-ldash', '1',
+        '-use_template', '1',
+        '-use_timeline', '1',
+        '-init_seg_name', 'init-stream$RepresentationID$.m4s',
+        '-media_seg_name', 'chunk-stream$RepresentationID$-$Number%05d$.m4s',
+        str(STREAM_PATH / 'manifest.mpd')
+    ]
+
+    logger.info("Starting FFmpeg for live stream")
+
+    try:
+        process = subprocess.Popen(
+            command,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            text=True,
+            bufsize=1
+        )
+
+        ffmpeg_process = process
+        stream_active = True
+
+        def monitor_process():
+            """Collect ffmpeg result and reset state when it exits."""
+            global ffmpeg_process, stream_active
+
+            logger.info(f"FFmpeg process started with PID {process.pid}")
+
+            exit_code = process.wait()
+            stderr = process.stderr.read()
+            if stderr:
+                logger.error(f"FFmpeg error output: {stderr}")
+
+            if exit_code != 0:
+                logger.error(f"FFmpeg exited with code {exit_code}")
+            else:
+                logger.info("FFmpeg process completed successfully")
+
+            ffmpeg_process = None
+            stream_active = False
+
+        threading.Thread(target=monitor_process, daemon=True).start()
+        return True
+
+    except Exception as exc:
+        logger.error(f"Failed to start FFmpeg: {exc}")
+        ffmpeg_process = None
+        stream_active = False
+        return False
+
+
+def cleanup_stream():
+    """Stop FFmpeg and purge any cached DASH fragments."""
+    global ffmpeg_process, stream_active
+
+    if ffmpeg_process:
+        try:
+            ffmpeg_process.terminate()
+            ffmpeg_process.wait(timeout=5)
+        except Exception as exc:  # pragma: no cover - best effort logging
+            logger.error(f"Error stopping FFmpeg: {exc}")
+            try:
+                ffmpeg_process.kill()
+            except Exception:  # pragma: no cover
+                pass
+        finally:
+            ffmpeg_process = None
+
+    stream_active = False
+    try:
+        reset_stream_path()
+    except Exception as exc:  # pragma: no cover - best effort logging
+        logger.error(f"Error resetting stream directory: {exc}")
+
+
+# Routes
+@app.route('/dash/manifest.mpd')
+def serve_dash_manifest():
+    """Serve the MPEG-DASH manifest"""
+    if not stream_active:
+        return "Stream not found", 404
+
+    return send_from_directory(str(STREAM_PATH), "manifest.mpd")
+
+
+@app.route('/dash/<path:filename>')
+def serve_dash_segments(filename):
+    """Serve the MPEG-DASH segment files"""
+    if not stream_active:
+        return "Stream not found", 404
+
+    return send_from_directory(str(STREAM_PATH), filename)
+
+
+@app.route('/rtmp_callbacks/on_publish', methods=['POST'])
+def on_publish():
+    """Callback when a stream starts"""
+    global stream_active
+
+    stream_key = request.form.get('name')
+
+    if not stream_key or stream_key != INGEST_PSK:
+        logger.warning("Unauthorized stream key attempted to publish")
+        return "Unauthorized", 403
+
+    if stream_active:
+        logger.info("Stream already active, recycling existing session")
+        cleanup_stream()
+
+    if not start_ffmpeg_process():
+        return "Failed to start stream", 500
+
+    logger.info("Stream started successfully")
+    logger.info(f"Access stream at https://{SERVER_DOMAIN}/dash/manifest.mpd")
+
+    return "OK"
+
+
+@app.route('/rtmp_callbacks/on_publish_done', methods=['POST'])
+def on_publish_done():
+    """Callback when a stream ends"""
+    global stream_active
+
+    stream_key = request.form.get('name')
+
+    if not stream_key or stream_key != INGEST_PSK:
+        return "Bad request", 400
+
+    if stream_active:
+        cleanup_stream()
+
+    logger.info("Stream publishing ended")
+    return "OK"
+
+
+@app.route('/health')
+def health_check():
+    """Health check endpoint"""
+    return {
+        "status": "healthy",
+        "streaming": ffmpeg_process is not None
+    }
+
+
+def print_instructions():
+    """Print usage instructions"""
+    obs_url = f"rtmp://{SERVER_DOMAIN}/live"
+    vrc_url = f"rtmp://{SERVER_DOMAIN}/live/{STREAM_HEX}"
+
+    print("\n" + "="*80)
+    print(f"{'OBS TO VRCHAT STREAMING PROXY':^80}")
+    print("="*80)
+
+    print("\n[URLS]")
+    print(f"  OBS:        {obs_url}")
+    print(f"  VRChat:     {vrc_url}")
+
+    print("\n[STATUS]")
+    print(f"  Stream is {'ACTIVE' if ffmpeg_process else 'INACTIVE'}")
+    print(f"  Session ID: {STREAM_HEX}")
+    print(f"  On-disk path: {STREAM_PATH}")
+    print("="*80 + "\n")
+
+
+# Register cleanup and start server
+if __name__ == '__main__':
+    atexit.register(cleanup_stream)
+    print_instructions()
+    app.run(host='0.0.0.0', port=int(os.environ.get('PORT', 5000)))