| # Copyright 2014 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| from telemetry.internal.image_processing import frame_generator |
| from telemetry.internal.util import external_modules |
| |
| np = external_modules.ImportRequiredModule('numpy') |
| |
| |
| class FakeFrameGenerator(frame_generator.FrameGenerator): |
| """ Fakes a Frame Generator, for testing. |
| |
| Attributes: |
| _frame_index: A frame read counter. |
| _timestamps: A generator of timestamps to return, or None. |
| _timestamp: The current timestamp. |
| _dimensions: The dimensions to return. |
| _channels: The number of color channels to return in the generated frames. |
| _frames: The number of frames to return before fake EOF.""" |
| def __init__(self, frames=1e16, dimensions=(320, 240), channels=3, |
| timestamps=(x for x in iter(int, 1))): |
| """ Initializes the FakeFrameGenerator object. |
| |
| Args: |
| frames: int, The number of frames to return before fake EOF. |
| dimensions: (int, int), The dimensions to return. |
| timestamps: generator, A generator of timestamps to return. The default |
| value is an infinite 0 generator. |
| channels: int, The number of color channels to return in the generated |
| frames, 1 for greyscale, 3 for RGB.""" |
| self._dimensions = dimensions |
| self._timestamps = timestamps |
| self._timestamp = 0 |
| self._frame_index = -1 |
| self._channels = channels |
| self._frames = frames |
| |
| super(FakeFrameGenerator, self).__init__() |
| |
| # OVERRIDE |
| def _CreateGenerator(self): |
| while self._frame_index < self._frames - 1: |
| self._frame_index += 1 |
| self._timestamp = next(self._timestamps) |
| yield np.zeros((self._dimensions[0], self._dimensions[1], |
| self._channels), np.uint8) |
| |
| # OVERRIDE |
| @property |
| def CurrentTimestamp(self): |
| return self._timestamp |
| |
| # OVERRIDE |
| @property |
| def CurrentFrameNumber(self): |
| return self._frame_index |
| |
| # OVERRIDE |
| @property |
| def Dimensions(self): |
| return self._dimensions |
