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# Copyright (c) OpenMMLab. All rights reserved.
import os
import os.path as osp
import shutil
import tempfile
from collections import OrderedDict
import pytest
import mmcv
class TestCache:
def test_init(self):
with pytest.raises(ValueError):
mmcv.Cache(0)
cache = mmcv.Cache(100)
assert cache.capacity == 100
assert cache.size == 0
def test_put(self):
cache = mmcv.Cache(3)
for i in range(1, 4):
cache.put(f'k{i}', i)
assert cache.size == i
assert cache._cache == OrderedDict([('k1', 1), ('k2', 2), ('k3', 3)])
cache.put('k4', 4)
assert cache.size == 3
assert cache._cache == OrderedDict([('k2', 2), ('k3', 3), ('k4', 4)])
cache.put('k2', 2)
assert cache._cache == OrderedDict([('k2', 2), ('k3', 3), ('k4', 4)])
def test_get(self):
cache = mmcv.Cache(3)
assert cache.get('key_none') is None
assert cache.get('key_none', 0) == 0
cache.put('k1', 1)
assert cache.get('k1') == 1
class TestVideoReader:
@classmethod
def setup_class(cls):
cls.video_path = osp.join(osp.dirname(__file__), '../data/test.mp4')
cls.num_frames = 168
cls.video_url = 'https://download.openmmlab.com/mmcv/test_data/sample-mp4-file.mp4' # noqa: E501
def test_load(self):
# read from video file
v = mmcv.VideoReader(self.video_path)
assert v.width == 294
assert v.height == 240
assert v.fps == 25
assert v.frame_cnt == self.num_frames
assert len(v) == self.num_frames
assert v.opened
import cv2
assert isinstance(v.vcap, type(cv2.VideoCapture()))
# read from video url
v = mmcv.VideoReader(self.video_url)
assert v.width == 320
assert v.height == 240
assert v.fps == 15
assert v.frame_cnt == 1889
assert len(v) == 1889
assert v.opened
assert isinstance(v.vcap, type(cv2.VideoCapture()))
def test_read(self):
v = mmcv.VideoReader(self.video_path)
img = v.read()
assert int(round(img.mean())) == 94
img = v.get_frame(63)
assert int(round(img.mean())) == 94
img = v[64]
assert int(round(img.mean())) == 205
img = v[-104]
assert int(round(img.mean())) == 205
img = v[63]
assert int(round(img.mean())) == 94
img = v[-105]
assert int(round(img.mean())) == 94
img = v.read()
assert int(round(img.mean())) == 205
with pytest.raises(IndexError):
v.get_frame(self.num_frames + 1)
with pytest.raises(IndexError):
v[-self.num_frames - 1]
def test_slice(self):
v = mmcv.VideoReader(self.video_path)
imgs = v[-105:-103]
assert int(round(imgs[0].mean())) == 94
assert int(round(imgs[1].mean())) == 205
assert len(imgs) == 2
imgs = v[63:65]
assert int(round(imgs[0].mean())) == 94
assert int(round(imgs[1].mean())) == 205
assert len(imgs) == 2
imgs = v[64:62:-1]
assert int(round(imgs[0].mean())) == 205
assert int(round(imgs[1].mean())) == 94
assert len(imgs) == 2
imgs = v[:5]
assert len(imgs) == 5
for img in imgs:
assert int(round(img.mean())) == 94
imgs = v[165:]
assert len(imgs) == 3
for img in imgs:
assert int(round(img.mean())) == 0
imgs = v[-3:]
assert len(imgs) == 3
for img in imgs:
assert int(round(img.mean())) == 0
def test_current_frame(self):
v = mmcv.VideoReader(self.video_path)
assert v.current_frame() is None
v.read()
img = v.current_frame()
assert int(round(img.mean())) == 94
def test_position(self):
v = mmcv.VideoReader(self.video_path)
assert v.position == 0
for _ in range(10):
v.read()
assert v.position == 10
v.get_frame(99)
assert v.position == 100
def test_iterator(self):
cnt = 0
for img in mmcv.VideoReader(self.video_path):
cnt += 1
assert img.shape == (240, 294, 3)
assert cnt == self.num_frames
def test_with(self):
with mmcv.VideoReader(self.video_path) as v:
assert v.opened
assert not v.opened
def test_cvt2frames(self):
v = mmcv.VideoReader(self.video_path)
frame_dir = tempfile.mkdtemp()
v.cvt2frames(frame_dir)
assert osp.isdir(frame_dir)
for i in range(self.num_frames):
filename = f'{frame_dir}/{i:06d}.jpg'
assert osp.isfile(filename)
os.remove(filename)
v = mmcv.VideoReader(self.video_path)
v.cvt2frames(frame_dir, show_progress=False)
assert osp.isdir(frame_dir)
for i in range(self.num_frames):
filename = f'{frame_dir}/{i:06d}.jpg'
assert osp.isfile(filename)
os.remove(filename)
v = mmcv.VideoReader(self.video_path)
v.cvt2frames(
frame_dir,
file_start=100,
filename_tmpl='{:03d}.JPEG',
start=100,
max_num=20)
assert osp.isdir(frame_dir)
for i in range(100, 120):
filename = f'{frame_dir}/{i:03d}.JPEG'
assert osp.isfile(filename)
os.remove(filename)
shutil.rmtree(frame_dir)
def test_frames2video(self):
v = mmcv.VideoReader(self.video_path)
frame_dir = tempfile.mkdtemp()
v.cvt2frames(frame_dir)
assert osp.isdir(frame_dir)
for i in range(self.num_frames):
filename = f'{frame_dir}/{i:06d}.jpg'
assert osp.isfile(filename)
out_filename = osp.join(tempfile.gettempdir(), 'mmcv_test.avi')
mmcv.frames2video(frame_dir, out_filename)
v = mmcv.VideoReader(out_filename)
assert v.fps == 30
assert len(v) == self.num_frames
mmcv.frames2video(
frame_dir,
out_filename,
fps=25,
start=10,
end=50,
show_progress=False)
with mmcv.VideoReader(out_filename) as v:
assert v.fps == 25
assert len(v) == 40
for i in range(self.num_frames):
filename = f'{frame_dir}/{i:06d}.jpg'
os.remove(filename)
shutil.rmtree(frame_dir)
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