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aplcam.py
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#!/usr/bin/env python
import sys
import argparse
import collections
import time
import pygame
import numpy
import cv2
import filters
import inspect
class FutCam:
def __init__(self, resolution=None, scale_to=None):
self.resolution = resolution
self.scale_to = scale_to
def run(self):
# Open a camera device for capturing.
self.cam = cv2.VideoCapture(0)
if not self.cam.isOpened():
print >> sys.stderr, 'error: could not open camera.'
return 1
if self.resolution is not None:
w, h = self.resolution
self.cam.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, w)
self.cam.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, h)
if self.scale_to is not None:
self.width, self.height = self.scale_to
else:
self.width = int(self.cam.get(cv2.cv.CV_CAP_PROP_FRAME_WIDTH))
self.height = int(self.cam.get(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT))
# Load the library.
self.futhark = filters.filters(interactive=True)
# Setup pygame.
pygame.init()
pygame.display.set_caption('futcam')
self.screen = pygame.display.set_mode((self.width, self.height))
self.font = pygame.font.Font(None, 36)
self.clock = pygame.time.Clock()
# Determine the filters using inspection.
self.filters = {}
for name,f in inspect.getmembers(filters.filters, predicate=inspect.ismethod):
if name != '__init__' and not name.startswith('futhark_'):
def makeApply(name, f):
def applyFilter(frame, dims, user_value):
return f(self.futhark, frame, dims, numpy.array([user_value], dtype=numpy.float32))
return applyFilter
self.filters[name] = makeApply(name, f)
return self.loop()
def message(self, what, where):
text = self.font.render(what, 1, (255, 255, 255))
self.screen.blit(text, where)
def loop(self):
filter_names = self.filters.keys()
filter_index = 0
applied_filters = []
show_hud = True
user_value = 0
user_value_status = 0
user_values = []
user_value_change_speed = 13
while True:
fps = self.clock.get_fps()
# Read frame.
time_start = time.time()
retval, frame = self.cam.read()
if not retval:
return 1
time_end = time.time()
cam_read_dur_ms = (time_end - time_start) * 1000
# Mess with the internal representation.
frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
# Scale if asked to.
if self.scale_to is not None:
w, h = self.scale_to
frame = cv2.resize(frame, (w,h))
#frame = self.futhark.scale_to(frame, w, h)
dims = numpy.asarray(frame.shape, dtype=numpy.int32)
frame = frame.reshape(numpy.product(dims)).astype(numpy.int32)
# Call stacked filters.
time_start = time.time()
for i, u in zip(applied_filters, user_values):
frame = self.filters[filter_names[i]](frame, dims, u)
# Apply the currently selected filter.
frame = self.filters[filter_names[filter_index]](frame, dims, user_value).get()
time_end = time.time()
futhark_dur_ms = (time_end - time_start) * 1000
# Mess with the internal representation.
frame = numpy.transpose(frame.reshape(dims), axes=[1,0,2])
# Show frame.
pygame.surfarray.blit_array(self.screen, frame)
# Render HUD.
if show_hud:
for i, fi, u in zip(range(len(applied_filters)), applied_filters, user_values):
self.message('%s %.2f' % (filter_names[fi],u), (5, 5 + 30 * i))
self.message('%s %.2f?' % (filter_names[filter_index], user_value),
(5, 5 + 30 * len(applied_filters)))
self.message('Camera read: {:.02f} ms'.format(cam_read_dur_ms),
(self.width - 310, 5))
self.message('APL: {:.02f} ms'.format(futhark_dur_ms),
(self.width - 250, 35))
self.message('FPS: {:.02f}'.format(fps),
(self.width - 210, 65))
# Show on screen.
pygame.display.flip()
# Check events.
for event in pygame.event.get():
if event.type == pygame.QUIT:
return 0
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_q:
return 0
elif event.key == pygame.K_UP:
filter_index = (filter_index - 1) % len(self.filters)
elif event.key == pygame.K_DOWN:
filter_index = (filter_index + 1) % len(self.filters)
elif event.key == pygame.K_RETURN:
applied_filters.append(filter_index)
user_values.append(user_value)
user_value = 0
elif event.key == pygame.K_BACKSPACE:
if len(user_values) > 0:
filter_index = applied_filters[-1]
applied_filters = applied_filters[:-1]
user_value = user_values[-1]
user_values = user_values[:-1]
elif event.key == pygame.K_LEFT:
user_value_status = -1
elif event.key == pygame.K_RIGHT:
user_value_status = 1
elif event.key == pygame.K_h:
show_hud = not show_hud
elif event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT:
user_value_status = 0
elif event.key == pygame.K_RIGHT:
user_value_status = 0
if user_value_status != 0:
user_value += user_value_status * (user_value_change_speed / fps)
self.clock.tick()
def main(args):
def size(s):
return tuple(map(int, s.split('x')))
arg_parser = argparse.ArgumentParser()
arg_parser.add_argument('--resolution', type=size, metavar='WIDTHxHEIGHT',
help='set the resolution of the webcam instead of relying on its default resolution')
arg_parser.add_argument('--scale-to', type=size, metavar='WIDTHxHEIGHT',
help='scale the camera output to this size before sending it to a filter')
args = arg_parser.parse_args(args)
cam = FutCam(resolution=args.resolution, scale_to=args.scale_to)
return cam.run()
if __name__ == '__main__':
sys.exit(main(sys.argv[1:]))