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"""
Video player implementation using PyAV for decoding and ModernGL for rendering.
Requires: pip install av
"""
import logging
from pathlib import Path
from typing import Union, Literal
import av
import moderngl
import moderngl_window
from moderngl_window import geometry
logger = logging.getLogger(__name__)
logging.basicConfig(level=logging.DEBUG)
class VideoDecoder:
"""Handles video decoding using PyAV."""
def __init__(self, path: Union[str, Path]):
self._path = Path(path)
if not self._path.exists():
raise FileNotFoundError(f"Video file not found: {self._path}")
self.container = av.open(str(self._path))
self.video = self.container.streams.video[0]
self.video.thread_type = "AUTO"
self.video.codec_context.pix_fmt = "yuv420p"
self._current_frame = 0
@property
def duration(self) -> float:
"""Video duration in seconds."""
if self.video.duration is None:
return float(self.container.duration * float(self.container.time_base))
return float(self.video.duration * float(self.video.time_base))
@property
def framerate(self) -> float:
"""Average framerate."""
rate = self.video.average_rate
return rate.numerator / rate.denominator
@property
def size(self) -> tuple[int, int]:
"""Video dimensions (width, height)."""
return self.video.width, self.video.height
def seek(self, time_seconds: float) -> None:
"""Seek to specified time position."""
try:
time_seconds = max(0, min(time_seconds, self.duration))
timestamp = int(time_seconds / float(self.video.time_base))
self.container.seek(timestamp, stream=self.video)
self._current_frame = int(time_seconds * self.framerate)
self.container.decode(video=0)
except Exception as e:
logger.error(f"Seek failed: {e}")
self.container.seek(0)
self._current_frame = 0
def get_frames(self):
"""Generate video frames from current position."""
try:
for packet in self.container.demux(video=0):
for frame in packet.decode():
self._current_frame += 1
yield frame.to_rgb().planes[0]
except Exception as e:
logger.error(f"Frame generation error: {e}")
@property
def frames(self) -> int:
"""Total number of frames in video."""
return int(self.duration * self.framerate)
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.container.close()
def close(self):
"""Explicitly close the video container."""
self.container.close()
class VideoPlayer:
"""Handles video playback and rendering using ModernGL."""
# Add constants at class level
FRAME_DIFF_THRESHOLD = 5
MAX_BEHIND_COUNT = 10
SKIP_OFFSET = 2
def __init__(self, ctx: moderngl.Context, path: Union[str, Path]):
self._ctx = ctx
self._decoder = VideoDecoder(path)
self._texture = self._ctx.texture(self._decoder.size, 3, dtype="f1")
self._frames = self._decoder.get_frames()
self._current_frame = 0
self._target_frame = 0
self._behind_count = 0
self._paused = False
@property
def fps(self) -> float:
return self._decoder.framerate
@property
def duration(self) -> float:
return self._decoder.duration
@property
def frames(self) -> int:
return self._decoder.frames
@property
def size(self) -> tuple[int, int]:
return self._decoder.size
@property
def texture(self) -> moderngl.Texture:
return self._texture
def update(self, time: float) -> bool:
"""Update video playback state."""
if self._paused:
return False
self._target_frame = int(time * self.fps)
frame_diff = self._target_frame - self._current_frame
# Check if we've reached the end
if self._current_frame >= self.frames:
self.seek(0)
return True
# Handle falling behind
if frame_diff > self.FRAME_DIFF_THRESHOLD:
self._behind_count += 1
skip_to = min(self._target_frame - self.SKIP_OFFSET, self.frames - 1)
if self._behind_count > self.MAX_BEHIND_COUNT:
self._decoder.seek(skip_to / self.fps)
self._frames = self._decoder.get_frames()
self._current_frame = skip_to
self._behind_count = 0
else:
try:
while self._current_frame < skip_to:
next(self._frames)
self._current_frame += 1
except StopIteration:
self.seek(0)
return True
else:
self._behind_count = max(0, self._behind_count - 1)
if frame_diff > 0:
try:
data = next(self._frames)
self._texture.write(data)
self._current_frame += 1
except StopIteration:
self.seek(0)
return True
return False
def seek(self, time: float) -> None:
"""Seek to specified time position."""
time = max(0, min(time, self.duration))
self._decoder.seek(time)
self._frames = self._decoder.get_frames()
self._current_frame = int(time * self.fps)
self._target_frame = self._current_frame
self._behind_count = 0
def toggle_pause(self) -> None:
"""Toggle pause state."""
self._paused = not self._paused
@property
def current_frame(self) -> int:
return self._current_frame
@property
def target_frame(self) -> int:
return self._target_frame
@property
def is_paused(self) -> bool:
return self._paused
class VideoPlayerWindow(moderngl_window.WindowConfig):
"""ModernGL window configuration for video playback."""
gl_version = (3, 3)
title = "Video Player"
resource_dir = Path(__file__).parent.resolve() / "resources"
vsync = True
seek_time = 1.0 # Seconds to seek when using arrow keys
log_level = logging.DEBUG
def __init__(self, **kwargs):
super().__init__(**kwargs)
# Initialize video player
video_path = self.resource_dir / "videos" / "Lightning - 33049.mp4"
self.player = VideoPlayer(self.ctx, video_path)
# Setup rendering
self.quad = geometry.quad_fs()
self.program = self.load_program("programs/texture_flipped.glsl")
# Setup stats printing
self._last_print_time = 0
def on_render(self, time: float, frametime: float) -> None:
"""Render frame."""
if self.player.update(time): # Check if video ended
self.timer.time = 0 # Reset timer if video ended
# Render video
self.player.texture.use(0)
self.quad.render(self.program)
# Print debug stats every 0.5 seconds regardless of pause state
if (time - self._last_print_time) >= 0.5 or time < self._last_print_time:
# Get FPS values with safety checks
fps_avg = self.timer.fps_average if self.timer.time > 0 else 0.0
logger.debug(
"Movie Target FPS: %.1f | Window FPS: %.1f | Frame: %d/%d | \
Time: %.2f/%.2f | Frame Diff: %d | Paused: %s",
self.player.fps,
fps_avg,
self.player.current_frame,
self.player.frames,
self.timer.time,
self.player.duration,
self.player.target_frame - self.player.current_frame,
self.player.is_paused,
)
self._last_print_time = time
def _handle_seek(self, direction: Literal["forward", "backward"]) -> None:
"""Handle seeking in video. direction: 'forward' or 'backward'"""
seek_amount = self.seek_time if direction == "forward" else -self.seek_time
new_time = max(0, min(self.player.duration, self.timer.time + seek_amount))
if self.timer.is_paused:
self.player.seek(new_time)
else:
self.timer.time = new_time
self.player.seek(new_time)
def on_key_event(self, key, action, modifiers) -> None:
"""Handle keyboard input."""
super().on_key_event(key, action, modifiers)
keys = self.wnd.keys
if action == keys.ACTION_PRESS:
if key == keys.LEFT:
self._handle_seek("backward")
elif key == keys.RIGHT:
self._handle_seek("forward")
elif key == keys.SPACE:
self.timer.toggle_pause()
self.player.toggle_pause()
if __name__ == "__main__":
VideoPlayerWindow.run()
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