Import L1 (celery) as l1/
This commit is contained in:
giles
593
l1/sexp_effects/primitive_libs/streaming.py
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593
l1/sexp_effects/primitive_libs/streaming.py
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@@ -0,0 +1,593 @@
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"""
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Streaming primitives for video/audio processing.
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These primitives handle video source reading and audio analysis,
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keeping the interpreter completely generic.
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GPU Acceleration:
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- Set STREAMING_GPU_PERSIST=1 to output CuPy arrays (frames stay on GPU)
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- Hardware video decoding (NVDEC) is used when available
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- Dramatically improves performance on GPU nodes
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Async Prefetching:
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- Set STREAMING_PREFETCH=1 to enable background frame prefetching
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- Decodes upcoming frames while current frame is being processed
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"""
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import os
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import numpy as np
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import subprocess
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import json
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import threading
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from collections import deque
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from pathlib import Path
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# Try to import CuPy for GPU acceleration
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try:
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import cupy as cp
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CUPY_AVAILABLE = True
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except ImportError:
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cp = None
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CUPY_AVAILABLE = False
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# GPU persistence mode - output CuPy arrays instead of numpy
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# Disabled by default until all primitives support GPU frames
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GPU_PERSIST = os.environ.get("STREAMING_GPU_PERSIST", "0") == "1" and CUPY_AVAILABLE
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# Async prefetch mode - decode frames in background thread
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PREFETCH_ENABLED = os.environ.get("STREAMING_PREFETCH", "1") == "1"
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PREFETCH_BUFFER_SIZE = int(os.environ.get("STREAMING_PREFETCH_SIZE", "10"))
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# Check for hardware decode support (cached)
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_HWDEC_AVAILABLE = None
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def _check_hwdec():
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"""Check if NVIDIA hardware decode is available."""
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global _HWDEC_AVAILABLE
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if _HWDEC_AVAILABLE is not None:
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return _HWDEC_AVAILABLE
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try:
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result = subprocess.run(["nvidia-smi"], capture_output=True, timeout=2)
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if result.returncode != 0:
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_HWDEC_AVAILABLE = False
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return False
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result = subprocess.run(["ffmpeg", "-hwaccels"], capture_output=True, text=True, timeout=5)
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_HWDEC_AVAILABLE = "cuda" in result.stdout
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except Exception:
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_HWDEC_AVAILABLE = False
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return _HWDEC_AVAILABLE
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class VideoSource:
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"""Video source with persistent streaming pipe for fast sequential reads."""
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def __init__(self, path: str, fps: float = 30):
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self.path = Path(path)
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self.fps = fps # Output fps for the stream
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self._frame_size = None
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self._duration = None
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self._proc = None # Persistent ffmpeg process
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self._stream_time = 0.0 # Current position in stream
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self._frame_time = 1.0 / fps # Time per frame at output fps
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self._last_read_time = -1
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self._cached_frame = None
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# Check if file exists
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if not self.path.exists():
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raise FileNotFoundError(f"Video file not found: {self.path}")
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# Get video info
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cmd = ["ffprobe", "-v", "quiet", "-print_format", "json",
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"-show_streams", str(self.path)]
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result = subprocess.run(cmd, capture_output=True, text=True)
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if result.returncode != 0:
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raise RuntimeError(f"Failed to probe video '{self.path}': {result.stderr}")
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try:
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info = json.loads(result.stdout)
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except json.JSONDecodeError:
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raise RuntimeError(f"Invalid video file or ffprobe failed: {self.path}")
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for stream in info.get("streams", []):
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if stream.get("codec_type") == "video":
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self._frame_size = (stream.get("width", 720), stream.get("height", 720))
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# Try direct duration field first
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if "duration" in stream:
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self._duration = float(stream["duration"])
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# Fall back to tags.DURATION (webm format: "00:01:00.124000000")
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elif "tags" in stream and "DURATION" in stream["tags"]:
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dur_str = stream["tags"]["DURATION"]
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parts = dur_str.split(":")
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if len(parts) == 3:
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h, m, s = parts
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self._duration = int(h) * 3600 + int(m) * 60 + float(s)
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break
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# Fallback: check format duration if stream duration not found
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if self._duration is None and "format" in info and "duration" in info["format"]:
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self._duration = float(info["format"]["duration"])
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if not self._frame_size:
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self._frame_size = (720, 720)
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import sys
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print(f"VideoSource: {self.path.name} duration={self._duration} size={self._frame_size}", file=sys.stderr)
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def _start_stream(self, seek_time: float = 0):
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"""Start or restart the ffmpeg streaming process.
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Uses NVIDIA hardware decoding (NVDEC) when available for better performance.
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"""
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if self._proc:
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self._proc.kill()
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self._proc = None
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# Check file exists before trying to open
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if not self.path.exists():
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raise FileNotFoundError(f"Video file not found: {self.path}")
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w, h = self._frame_size
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# Build ffmpeg command with optional hardware decode
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cmd = ["ffmpeg", "-v", "error"]
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# Use hardware decode if available (significantly faster)
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if _check_hwdec():
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cmd.extend(["-hwaccel", "cuda"])
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cmd.extend([
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"-ss", f"{seek_time:.3f}",
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"-i", str(self.path),
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"-f", "rawvideo", "-pix_fmt", "rgb24",
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"-s", f"{w}x{h}",
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"-r", str(self.fps), # Output at specified fps
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"-"
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])
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self._proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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self._stream_time = seek_time
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# Check if process started successfully by reading first bit of stderr
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import select
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import sys
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readable, _, _ = select.select([self._proc.stderr], [], [], 0.5)
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if readable:
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err = self._proc.stderr.read(4096).decode('utf-8', errors='ignore')
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if err:
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print(f"ffmpeg error for {self.path.name}: {err}", file=sys.stderr)
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def _read_frame_from_stream(self):
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"""Read one frame from the stream.
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Returns CuPy array if GPU_PERSIST is enabled, numpy array otherwise.
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"""
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w, h = self._frame_size
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frame_size = w * h * 3
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if not self._proc or self._proc.poll() is not None:
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return None
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data = self._proc.stdout.read(frame_size)
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if len(data) < frame_size:
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return None
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frame = np.frombuffer(data, dtype=np.uint8).reshape((h, w, 3)).copy()
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# Transfer to GPU if persistence mode enabled
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if GPU_PERSIST:
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return cp.asarray(frame)
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return frame
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def read(self) -> np.ndarray:
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"""Read frame (uses last cached or t=0)."""
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if self._cached_frame is not None:
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return self._cached_frame
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return self.read_at(0)
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def read_at(self, t: float) -> np.ndarray:
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"""Read frame at specific time using streaming with smart seeking."""
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# Cache check - return same frame for same time
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if t == self._last_read_time and self._cached_frame is not None:
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return self._cached_frame
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w, h = self._frame_size
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# Loop time if video is shorter
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seek_time = t
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if self._duration and self._duration > 0:
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seek_time = t % self._duration
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# If we're within 0.1s of the end, wrap to beginning to avoid EOF issues
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if seek_time > self._duration - 0.1:
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seek_time = 0.0
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# Decide whether to seek or continue streaming
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# Seek if: no stream, going backwards (more than 1 frame), or jumping more than 2 seconds ahead
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# Allow small backward tolerance to handle floating point and timing jitter
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need_seek = (
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self._proc is None or
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self._proc.poll() is not None or
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seek_time < self._stream_time - self._frame_time or # More than 1 frame backward
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seek_time > self._stream_time + 2.0
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)
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if need_seek:
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import sys
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reason = "no proc" if self._proc is None else "proc dead" if self._proc.poll() is not None else "backward" if seek_time < self._stream_time else "jump"
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print(f"SEEK {self.path.name}: t={t:.4f} seek={seek_time:.4f} stream={self._stream_time:.4f} ({reason})", file=sys.stderr)
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self._start_stream(seek_time)
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# Skip frames to reach target time
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skip_retries = 0
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while self._stream_time + self._frame_time <= seek_time:
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frame = self._read_frame_from_stream()
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if frame is None:
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# Stream ended or failed - restart from seek point
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import time
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skip_retries += 1
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if skip_retries > 3:
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# Give up skipping, just start fresh at seek_time
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self._start_stream(seek_time)
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time.sleep(0.1)
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break
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self._start_stream(seek_time)
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time.sleep(0.05)
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continue
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self._stream_time += self._frame_time
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skip_retries = 0 # Reset on successful read
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# Read the target frame with retry logic
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frame = None
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max_retries = 3
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for attempt in range(max_retries):
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frame = self._read_frame_from_stream()
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if frame is not None:
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break
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# Stream failed - try restarting
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import sys
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import time
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print(f"RETRY {self.path.name}: attempt {attempt+1}/{max_retries} at t={t:.2f}", file=sys.stderr)
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# Check for ffmpeg errors
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if self._proc and self._proc.stderr:
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try:
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import select
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readable, _, _ = select.select([self._proc.stderr], [], [], 0.1)
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if readable:
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err = self._proc.stderr.read(4096).decode('utf-8', errors='ignore')
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if err:
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print(f"ffmpeg error: {err}", file=sys.stderr)
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except:
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pass
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# Wait a bit and restart
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time.sleep(0.1)
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self._start_stream(seek_time)
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# Give ffmpeg time to start
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time.sleep(0.1)
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if frame is None:
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import sys
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raise RuntimeError(f"Failed to read video frame from {self.path.name} at t={t:.2f} after {max_retries} retries")
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else:
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self._stream_time += self._frame_time
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self._last_read_time = t
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self._cached_frame = frame
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return frame
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def skip(self):
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"""No-op for seek-based reading."""
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pass
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@property
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def size(self):
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return self._frame_size
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def close(self):
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if self._proc:
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self._proc.kill()
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self._proc = None
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class PrefetchingVideoSource:
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"""
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Video source with background prefetching for improved performance.
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Wraps VideoSource and adds a background thread that pre-decodes
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upcoming frames while the main thread processes the current frame.
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"""
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def __init__(self, path: str, fps: float = 30, buffer_size: int = None):
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self._source = VideoSource(path, fps)
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self._buffer_size = buffer_size or PREFETCH_BUFFER_SIZE
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self._buffer = {} # time -> frame
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self._buffer_lock = threading.Lock()
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self._prefetch_time = 0.0
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self._frame_time = 1.0 / fps
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self._stop_event = threading.Event()
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self._request_event = threading.Event()
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self._target_time = 0.0
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# Start prefetch thread
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self._thread = threading.Thread(target=self._prefetch_loop, daemon=True)
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self._thread.start()
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import sys
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print(f"PrefetchingVideoSource: {path} buffer_size={self._buffer_size}", file=sys.stderr)
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def _prefetch_loop(self):
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"""Background thread that pre-reads frames."""
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while not self._stop_event.is_set():
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# Wait for work or timeout
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self._request_event.wait(timeout=0.01)
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self._request_event.clear()
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if self._stop_event.is_set():
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break
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# Prefetch frames ahead of target time
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target = self._target_time
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with self._buffer_lock:
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# Clean old frames (more than 1 second behind)
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old_times = [t for t in self._buffer.keys() if t < target - 1.0]
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for t in old_times:
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del self._buffer[t]
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# Count how many frames we have buffered ahead
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buffered_ahead = sum(1 for t in self._buffer.keys() if t >= target)
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# Prefetch if buffer not full
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if buffered_ahead < self._buffer_size:
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# Find next time to prefetch
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prefetch_t = target
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with self._buffer_lock:
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existing_times = set(self._buffer.keys())
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for _ in range(self._buffer_size):
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if prefetch_t not in existing_times:
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break
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prefetch_t += self._frame_time
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# Read the frame (this is the slow part)
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try:
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frame = self._source.read_at(prefetch_t)
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with self._buffer_lock:
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self._buffer[prefetch_t] = frame
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except Exception as e:
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import sys
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print(f"Prefetch error at t={prefetch_t}: {e}", file=sys.stderr)
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def read_at(self, t: float) -> np.ndarray:
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"""Read frame at specific time, using prefetch buffer if available."""
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self._target_time = t
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self._request_event.set() # Wake up prefetch thread
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# Round to frame time for buffer lookup
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t_key = round(t / self._frame_time) * self._frame_time
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# Check buffer first
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with self._buffer_lock:
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if t_key in self._buffer:
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return self._buffer[t_key]
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# Also check for close matches (within half frame time)
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for buf_t, frame in self._buffer.items():
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if abs(buf_t - t) < self._frame_time * 0.5:
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return frame
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# Not in buffer - read directly (blocking)
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frame = self._source.read_at(t)
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# Store in buffer
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with self._buffer_lock:
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self._buffer[t_key] = frame
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return frame
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def read(self) -> np.ndarray:
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"""Read frame (uses last cached or t=0)."""
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return self.read_at(0)
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def skip(self):
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"""No-op for seek-based reading."""
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pass
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@property
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def size(self):
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return self._source.size
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@property
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def path(self):
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return self._source.path
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def close(self):
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self._stop_event.set()
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self._request_event.set() # Wake up thread to exit
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self._thread.join(timeout=1.0)
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self._source.close()
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class AudioAnalyzer:
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"""Audio analyzer for energy and beat detection."""
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def __init__(self, path: str, sample_rate: int = 22050):
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self.path = Path(path)
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self.sample_rate = sample_rate
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# Check if file exists
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if not self.path.exists():
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raise FileNotFoundError(f"Audio file not found: {self.path}")
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# Load audio via ffmpeg
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cmd = ["ffmpeg", "-v", "error", "-i", str(self.path),
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"-f", "f32le", "-ac", "1", "-ar", str(sample_rate), "-"]
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result = subprocess.run(cmd, capture_output=True)
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if result.returncode != 0:
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raise RuntimeError(f"Failed to load audio '{self.path}': {result.stderr.decode()}")
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self._audio = np.frombuffer(result.stdout, dtype=np.float32)
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if len(self._audio) == 0:
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raise RuntimeError(f"Audio file is empty or invalid: {self.path}")
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# Get duration
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cmd = ["ffprobe", "-v", "quiet", "-print_format", "json",
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"-show_format", str(self.path)]
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result = subprocess.run(cmd, capture_output=True, text=True)
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if result.returncode != 0:
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raise RuntimeError(f"Failed to probe audio '{self.path}': {result.stderr}")
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info = json.loads(result.stdout)
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self.duration = float(info.get("format", {}).get("duration", 60))
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||||
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||||
# Beat detection state
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||||
self._flux_history = []
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||||
self._last_beat_time = -1
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||||
self._beat_count = 0
|
||||
self._last_beat_check_time = -1
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||||
# Cache beat result for current time (so multiple scans see same result)
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||||
self._beat_cache_time = -1
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||||
self._beat_cache_result = False
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||||
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||||
def get_energy(self, t: float) -> float:
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||||
"""Get energy level at time t (0-1)."""
|
||||
idx = int(t * self.sample_rate)
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start = max(0, idx - 512)
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||||
end = min(len(self._audio), idx + 512)
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||||
if start >= end:
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return 0.0
|
||||
return min(1.0, np.sqrt(np.mean(self._audio[start:end] ** 2)) * 3.0)
|
||||
|
||||
def get_beat(self, t: float) -> bool:
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||||
"""Check if there's a beat at time t."""
|
||||
# Return cached result if same time (multiple scans query same frame)
|
||||
if t == self._beat_cache_time:
|
||||
return self._beat_cache_result
|
||||
|
||||
idx = int(t * self.sample_rate)
|
||||
size = 2048
|
||||
|
||||
start, end = max(0, idx - size//2), min(len(self._audio), idx + size//2)
|
||||
if end - start < size/2:
|
||||
self._beat_cache_time = t
|
||||
self._beat_cache_result = False
|
||||
return False
|
||||
curr = self._audio[start:end]
|
||||
|
||||
pstart, pend = max(0, start - 512), max(0, end - 512)
|
||||
if pend <= pstart:
|
||||
self._beat_cache_time = t
|
||||
self._beat_cache_result = False
|
||||
return False
|
||||
prev = self._audio[pstart:pend]
|
||||
|
||||
curr_spec = np.abs(np.fft.rfft(curr * np.hanning(len(curr))))
|
||||
prev_spec = np.abs(np.fft.rfft(prev * np.hanning(len(prev))))
|
||||
|
||||
n = min(len(curr_spec), len(prev_spec))
|
||||
flux = np.sum(np.maximum(0, curr_spec[:n] - prev_spec[:n])) / (n + 1)
|
||||
|
||||
self._flux_history.append((t, flux))
|
||||
if len(self._flux_history) > 50:
|
||||
self._flux_history = self._flux_history[-50:]
|
||||
|
||||
if len(self._flux_history) < 5:
|
||||
self._beat_cache_time = t
|
||||
self._beat_cache_result = False
|
||||
return False
|
||||
|
||||
recent = [f for _, f in self._flux_history[-20:]]
|
||||
threshold = np.mean(recent) + 1.5 * np.std(recent)
|
||||
|
||||
is_beat = flux > threshold and (t - self._last_beat_time) > 0.1
|
||||
if is_beat:
|
||||
self._last_beat_time = t
|
||||
if t > self._last_beat_check_time:
|
||||
self._beat_count += 1
|
||||
self._last_beat_check_time = t
|
||||
|
||||
# Cache result for this time
|
||||
self._beat_cache_time = t
|
||||
self._beat_cache_result = is_beat
|
||||
return is_beat
|
||||
|
||||
def get_beat_count(self, t: float) -> int:
|
||||
"""Get cumulative beat count up to time t."""
|
||||
# Ensure beat detection has run up to this time
|
||||
self.get_beat(t)
|
||||
return self._beat_count
|
||||
|
||||
|
||||
# === Primitives ===
|
||||
|
||||
def prim_make_video_source(path: str, fps: float = 30):
|
||||
"""Create a video source from a file path.
|
||||
|
||||
Uses PrefetchingVideoSource if STREAMING_PREFETCH=1 (default).
|
||||
"""
|
||||
if PREFETCH_ENABLED:
|
||||
return PrefetchingVideoSource(path, fps)
|
||||
return VideoSource(path, fps)
|
||||
|
||||
|
||||
def prim_source_read(source: VideoSource, t: float = None):
|
||||
"""Read a frame from a video source."""
|
||||
import sys
|
||||
if t is not None:
|
||||
frame = source.read_at(t)
|
||||
# Debug: show source and time
|
||||
if int(t * 10) % 10 == 0: # Every second
|
||||
print(f"READ {source.path.name}: t={t:.2f} stream={source._stream_time:.2f}", file=sys.stderr)
|
||||
return frame
|
||||
return source.read()
|
||||
|
||||
|
||||
def prim_source_skip(source: VideoSource):
|
||||
"""Skip a frame (keep pipe in sync)."""
|
||||
source.skip()
|
||||
|
||||
|
||||
def prim_source_size(source: VideoSource):
|
||||
"""Get (width, height) of source."""
|
||||
return source.size
|
||||
|
||||
|
||||
def prim_make_audio_analyzer(path: str):
|
||||
"""Create an audio analyzer from a file path."""
|
||||
return AudioAnalyzer(path)
|
||||
|
||||
|
||||
def prim_audio_energy(analyzer: AudioAnalyzer, t: float) -> float:
|
||||
"""Get energy level (0-1) at time t."""
|
||||
return analyzer.get_energy(t)
|
||||
|
||||
|
||||
def prim_audio_beat(analyzer: AudioAnalyzer, t: float) -> bool:
|
||||
"""Check if there's a beat at time t."""
|
||||
return analyzer.get_beat(t)
|
||||
|
||||
|
||||
def prim_audio_beat_count(analyzer: AudioAnalyzer, t: float) -> int:
|
||||
"""Get cumulative beat count up to time t."""
|
||||
return analyzer.get_beat_count(t)
|
||||
|
||||
|
||||
def prim_audio_duration(analyzer: AudioAnalyzer) -> float:
|
||||
"""Get audio duration in seconds."""
|
||||
return analyzer.duration
|
||||
|
||||
|
||||
# Export primitives
|
||||
PRIMITIVES = {
|
||||
# Video source
|
||||
'make-video-source': prim_make_video_source,
|
||||
'source-read': prim_source_read,
|
||||
'source-skip': prim_source_skip,
|
||||
'source-size': prim_source_size,
|
||||
|
||||
# Audio analyzer
|
||||
'make-audio-analyzer': prim_make_audio_analyzer,
|
||||
'audio-energy': prim_audio_energy,
|
||||
'audio-beat': prim_audio_beat,
|
||||
'audio-beat-count': prim_audio_beat_count,
|
||||
'audio-duration': prim_audio_duration,
|
||||
}
|
||||
Reference in New Issue
Block a user