166 lines
6.1 KiB
Python
166 lines
6.1 KiB
Python
"""HLS preview manager for live video preview via HTTP Live Streaming."""
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import asyncio
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import logging
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import os
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from pathlib import Path
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from ..config import Settings
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logger = logging.getLogger(__name__)
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def _deltacast_device_exists(port_index: int) -> bool:
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"""Return True if the deltacast device node exists on the host."""
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return os.path.exists(f"/dev/deltacast{port_index}")
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class HLSPreviewManager:
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"""
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Manages FFmpeg HLS transcoding processes for video preview.
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Falls back to a lavfi test source when no physical deltacast device is present.
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"""
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def __init__(self, settings: Settings, hls_dir: str = "/tmp/hls"):
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self.settings = settings
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self.hls_dir = Path(hls_dir)
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self._processes: dict[int, asyncio.subprocess.Process] = {}
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async def start_preview(self, port_index: int) -> None:
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if port_index in self._processes and self._processes[port_index] is not None:
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proc = self._processes[port_index]
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if not proc.done():
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logger.info(f"Port {port_index}: HLS preview already running")
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return
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# Process died — clean up and restart
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self._processes.pop(port_index)
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self.hls_dir.mkdir(parents=True, exist_ok=True)
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use_test_src = not _deltacast_device_exists(port_index)
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command = self._build_hls_command(port_index, use_test_src=use_test_src)
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if use_test_src:
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logger.info(f"Port {port_index}: No deltacast device — using lavfi test source for HLS")
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else:
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logger.info(f"Port {port_index}: Starting HLS preview from deltacast{port_index}")
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logger.debug(f"Port {port_index}: FFmpeg command: {' '.join(command)}")
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try:
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process = await asyncio.create_subprocess_exec(
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*command,
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stdin=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.PIPE,
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stdout=asyncio.subprocess.PIPE,
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)
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self._processes[port_index] = process
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logger.info(f"Port {port_index}: HLS preview started (PID: {process.pid})")
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except Exception as e:
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logger.error(f"Port {port_index}: Failed to start HLS preview: {e}")
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raise
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async def stop_preview(self, port_index: int) -> None:
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if port_index not in self._processes or self._processes[port_index] is None:
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return
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process = self._processes[port_index]
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logger.info(f"Port {port_index}: Stopping HLS preview (PID: {process.pid})")
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try:
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if process.stdin and not process.stdin.is_closing():
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try:
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process.stdin.write(b"q\n")
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await process.stdin.drain()
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except (BrokenPipeError, ConnectionResetError):
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pass
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try:
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await asyncio.wait_for(process.wait(), timeout=3.0)
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return
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except asyncio.TimeoutError:
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pass
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try:
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process.terminate()
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except ProcessLookupError:
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return
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try:
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await asyncio.wait_for(process.wait(), timeout=2.0)
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except asyncio.TimeoutError:
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try:
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process.kill()
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await process.wait()
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except ProcessLookupError:
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pass
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except Exception as e:
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logger.error(f"Port {port_index}: Error stopping HLS preview: {e}")
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finally:
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self._processes[port_index] = None
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async def stop_all(self) -> None:
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for port_index in list(self._processes.keys()):
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await self.stop_preview(port_index)
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def get_playlist_path(self, port_index: int) -> Path:
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return self.hls_dir / f"port_{port_index}.m3u8"
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def is_previewing(self, port_index: int) -> bool:
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if port_index not in self._processes:
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return False
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process = self._processes[port_index]
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return process is not None and not process.done()
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def _build_hls_command(self, port_index: int, use_test_src: bool = False) -> list[str]:
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playlist_path = self.get_playlist_path(port_index)
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if use_test_src:
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# lavfi test source: colour bars + timestamp overlay + tone
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# Port number overlaid so each card is visually distinct
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command = [
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self.settings.ffmpeg_path,
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"-f", "lavfi",
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"-i", (
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f"testsrc2=size=1280x720:rate=30,"
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f"drawtext=text='SDI PORT {port_index} — NO SIGNAL':"
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f"fontsize=36:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2,"
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f"drawtext=text='%{{localtime\\:%H\\:%M\\:%S}}':"
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f"fontsize=24:fontcolor=yellow:x=10:y=10"
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),
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"-f", "lavfi", "-i", "sine=frequency=1000:sample_rate=48000",
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"-c:v", "libx264",
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"-preset", "ultrafast",
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"-tune", "zerolatency",
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"-b:v", "2M",
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"-g", "30",
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"-c:a", "aac",
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"-b:a", "64k",
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"-f", "hls",
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"-hls_time", "2",
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"-hls_list_size", "4",
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"-hls_flags", "delete_segments+append_list",
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"-hls_segment_filename", str(self.hls_dir / f"port_{port_index}_%03d.ts"),
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str(playlist_path),
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]
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else:
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command = [
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self.settings.ffmpeg_path,
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"-f", "deltacast",
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"-i", f"deltacast://{port_index}",
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"-c:v", "libx264",
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"-preset", "ultrafast",
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"-tune", "zerolatency",
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"-b:v", "5M",
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"-s", "1280x720",
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"-c:a", "aac",
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"-b:a", "128k",
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"-f", "hls",
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"-hls_time", "2",
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"-hls_list_size", "4",
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"-hls_flags", "delete_segments+append_list",
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"-hls_segment_filename", str(self.hls_dir / f"port_{port_index}_%03d.ts"),
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str(playlist_path),
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]
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return command
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