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# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import cv2
import numpy as np
class RawVideoStream():
"""
A video stream from a raw mp4 file, using opencv.
This does not support nested iterations.
"""
def __init__(
self, path: str, seek_range: range | None = None
) -> None:
super().__init__()
if seek_range is None:
seek_range = range(-1)
self.path = path
# Read metadata
vcap = cv2.VideoCapture(self.path)
self._width = int(vcap.get(cv2.CAP_PROP_FRAME_WIDTH))
self._height = int(vcap.get(cv2.CAP_PROP_FRAME_HEIGHT))
_fps = vcap.get(cv2.CAP_PROP_FPS)
_n_frames = int(vcap.get(cv2.CAP_PROP_FRAME_COUNT))
vcap.release()
self.start = seek_range.start
self.end = seek_range.stop if seek_range.stop != -1 else _n_frames
self.end = min(self.end, _n_frames)
self.step = seek_range.step
self._fps = _fps / self.step
def frame_size(self) -> tuple[int, int]:
"""Returns (height, width)."""
return (self._height, self._width)
def fps(self) -> float:
return self._fps
def __len__(self) -> int:
return len(range(self.start, self.end, self.step))
def __iter__(self):
self.vcap = cv2.VideoCapture(self.path)
self.current_frame_idx = -1
return self
def __next__(self) -> tuple[int, np.ndarray]:
while True:
ret, frame = self.vcap.read()
self.current_frame_idx += 1
if not ret:
self.vcap.release()
raise StopIteration
if self.current_frame_idx >= self.end:
self.vcap.release()
raise StopIteration
if self.current_frame_idx < self.start:
continue
if (self.current_frame_idx - self.start) % self.step == 0:
break
frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
return self.current_frame_idx, frame
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