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feat(webp-encoder): support webp encoder

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numb3r3 committed Oct 14, 2019
1 parent 74ccc5d commit 3c3c54b5eb57213c20b50c6679c74750dc5d2306
Showing with 38 additions and 3 deletions.
  1. +34 −0 gnes/preprocessor/io_utils/webp.py
  2. +4 −3 gnes/preprocessor/video/video_encoder.py
@@ -0,0 +1,34 @@
# Tencent is pleased to support the open source community by making GNES available.
#
# Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
# 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.

from typing import List
import webp
from PIL import Image

def encode_video(images: List['np.ndarray'], frame_rate: int, pix_fmt: str = 'rgb24'):
height, width, channels = images[0].shape
if pix_fmt == 'rgb24':
pix_fmt = 'RGB'
# Save an animation
enc = webp.WebPAnimEncoder.new(width, height)
timestamp_ms = 0
duration = 1000 // frame_rate
for x in images:
img = Image.fromarray(x.copy(), pix_fmt)
pic = webp.WebPPicture.from_pil(img)
enc.encode_frame(pic, timestamp_ms)
timestamp_ms += duration
anim_data = enc.assemble(timestamp_ms)
return bytes(anim_data.buffer())
@@ -15,7 +15,7 @@

from ...proto import gnes_pb2, blob2array
from ..base import BaseVideoPreprocessor
from ..io_utils import video, gif
from ..io_utils import video, gif, webp


class VideoEncoderPreprocessor(BaseVideoPreprocessor):
@@ -25,16 +25,17 @@ def __init__(self, frame_rate: int = 10, pix_fmt: str = 'rgb24', video_format: s
self.frame_rate = frame_rate
self.video_format = video_format

if self.video_format not in ['mp4', 'gif']:
if self.video_format not in ['mp4', 'gif', 'webp']:
raise ValueError("%s encoder has not been supported!" % (self.video_format))


def _encode(self, images: 'np.ndarray'):
encoder = None
if self.video_format == 'mp4':
encoder = video
elif self.video_format == 'gif':
encoder = gif
elif self.video_format == 'webp':
encoder = webp

return encoder.encode_video(images, pix_fmt=self.pix_fmt, frame_rate=self.frame_rate)

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