ref: 742dbe2a6ae83d01deafa2eea0e838418a8c6d37
dir: /tools/3D-Reconstruction/genY4M/genY4M.py/
## Copyright (c) 2020 The WebM project authors. All Rights Reserved.
##
## Use of this source code is governed by a BSD-style license
## that can be found in the LICENSE file in the root of the source
## tree. An additional intellectual property rights grant can be found
## in the file PATENTS. All contributing project authors may
## be found in the AUTHORS file in the root of the source tree.
##
import argparse
from os import listdir, path
from PIL import Image
import sys
parser = argparse.ArgumentParser()
parser.add_argument("--frame_path", default="../data/frame/", type=str)
parser.add_argument("--frame_rate", default="25:1", type=str)
parser.add_argument("--interlacing", default="Ip", type=str)
parser.add_argument("--pix_ratio", default="0:0", type=str)
parser.add_argument("--color_space", default="4:2:0", type=str)
parser.add_argument("--output", default="output.y4m", type=str)
def generate(args, frames):
if len(frames) == 0:
return
#sort the frames based on the frame index
frames = sorted(frames, key=lambda x: x[0])
#convert the frames to YUV form
frames = [f.convert("YCbCr") for _, f in frames]
#write the header
header = "YUV4MPEG2 W%d H%d F%s %s A%s" % (frames[0].width, frames[0].height,
args.frame_rate, args.interlacing,
args.pix_ratio)
cs = args.color_space.split(":")
header += " C%s%s%s\n" % (cs[0], cs[1], cs[2])
#estimate the sample step based on subsample value
subsamples = [int(c) for c in cs]
r_step = [1, int(subsamples[2] == 0) + 1, int(subsamples[2] == 0) + 1]
c_step = [1, 4 // subsamples[1], 4 // subsamples[1]]
#write in frames
with open(args.output, "wb") as y4m:
y4m.write(header)
for f in frames:
y4m.write("FRAME\n")
px = f.load()
for k in xrange(3):
for i in xrange(0, f.height, r_step[k]):
for j in xrange(0, f.width, c_step[k]):
yuv = px[j, i]
y4m.write(chr(yuv[k]))
if __name__ == "__main__":
args = parser.parse_args()
frames = []
frames_mv = []
for filename in listdir(args.frame_path):
name, ext = filename.split(".")
if ext == "png":
name_parse = name.split("_")
idx = int(name_parse[-1])
img = Image.open(path.join(args.frame_path, filename))
if name_parse[-2] == "mv":
frames_mv.append((idx, img))
else:
frames.append((idx, img))
if len(frames) == 0:
print("No frames in directory: " + args.frame_path)
sys.exit()
print("----------------------Y4M Info----------------------")
print("width: %d" % frames[0][1].width)
print("height: %d" % frames[0][1].height)
print("#frame: %d" % len(frames))
print("frame rate: %s" % args.frame_rate)
print("interlacing: %s" % args.interlacing)
print("pixel ratio: %s" % args.pix_ratio)
print("color space: %s" % args.color_space)
print("----------------------------------------------------")
print("Generating ...")
generate(args, frames)
if len(frames_mv) != 0:
args.output = args.output.replace(".y4m", "_mv.y4m")
generate(args, frames_mv)