Francesco Siddi
2c5dc34ea2
Refactor of pillar-server and pillar-web into a single python package. This simplifies the overall architecture of pillar applications. Special thanks @sybren and @venomgfx
204 lines
7.1 KiB
Python
204 lines
7.1 KiB
Python
import os
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import json
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import subprocess
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from PIL import Image
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from flask import current_app
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def generate_local_thumbnails(name_base, src):
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"""Given a source image, use Pillow to generate thumbnails according to the
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application settings.
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:param name_base: the thumbnail will get a field 'name': '{basename}-{thumbsize}.jpg'
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:type name_base: str
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:param src: the path of the image to be thumbnailed
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:type src: str
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"""
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thumbnail_settings = current_app.config['UPLOADS_LOCAL_STORAGE_THUMBNAILS']
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thumbnails = []
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save_to_base, _ = os.path.splitext(src)
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name_base, _ = os.path.splitext(name_base)
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for size, settings in thumbnail_settings.iteritems():
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dst = '{0}-{1}{2}'.format(save_to_base, size, '.jpg')
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name = '{0}-{1}{2}'.format(name_base, size, '.jpg')
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if settings['crop']:
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resize_and_crop(src, dst, settings['size'])
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width, height = settings['size']
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else:
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im = Image.open(src).convert('RGB')
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im.thumbnail(settings['size'])
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im.save(dst, "JPEG")
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width, height = im.size
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thumb_info = {'size': size,
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'file_path': name,
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'local_path': dst,
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'length': os.stat(dst).st_size,
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'width': width,
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'height': height,
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'md5': '',
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'content_type': 'image/jpeg'}
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if size == 't':
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thumb_info['is_public'] = True
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thumbnails.append(thumb_info)
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return thumbnails
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def resize_and_crop(img_path, modified_path, size, crop_type='middle'):
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"""
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Resize and crop an image to fit the specified size. Thanks to:
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https://gist.github.com/sigilioso/2957026
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args:
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img_path: path for the image to resize.
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modified_path: path to store the modified image.
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size: `(width, height)` tuple.
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crop_type: can be 'top', 'middle' or 'bottom', depending on this
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value, the image will cropped getting the 'top/left', 'middle' or
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'bottom/right' of the image to fit the size.
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raises:
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Exception: if can not open the file in img_path of there is problems
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to save the image.
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ValueError: if an invalid `crop_type` is provided.
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"""
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# If height is higher we resize vertically, if not we resize horizontally
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img = Image.open(img_path).convert('RGB')
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# Get current and desired ratio for the images
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img_ratio = img.size[0] / float(img.size[1])
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ratio = size[0] / float(size[1])
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# The image is scaled/cropped vertically or horizontally depending on the ratio
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if ratio > img_ratio:
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img = img.resize((size[0], int(round(size[0] * img.size[1] / img.size[0]))),
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Image.ANTIALIAS)
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# Crop in the top, middle or bottom
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if crop_type == 'top':
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box = (0, 0, img.size[0], size[1])
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elif crop_type == 'middle':
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box = (0, int(round((img.size[1] - size[1]) / 2)), img.size[0],
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int(round((img.size[1] + size[1]) / 2)))
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elif crop_type == 'bottom':
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box = (0, img.size[1] - size[1], img.size[0], img.size[1])
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else:
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raise ValueError('ERROR: invalid value for crop_type')
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img = img.crop(box)
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elif ratio < img_ratio:
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img = img.resize((int(round(size[1] * img.size[0] / img.size[1])), size[1]),
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Image.ANTIALIAS)
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# Crop in the top, middle or bottom
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if crop_type == 'top':
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box = (0, 0, size[0], img.size[1])
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elif crop_type == 'middle':
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box = (int(round((img.size[0] - size[0]) / 2)), 0,
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int(round((img.size[0] + size[0]) / 2)), img.size[1])
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elif crop_type == 'bottom':
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box = (img.size[0] - size[0], 0, img.size[0], img.size[1])
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else:
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raise ValueError('ERROR: invalid value for crop_type')
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img = img.crop(box)
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else:
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img = img.resize((size[0], size[1]),
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Image.ANTIALIAS)
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# If the scale is the same, we do not need to crop
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img.save(modified_path, "JPEG")
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def get_video_data(filepath):
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"""Return video duration and resolution given an input file path"""
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outdata = None
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ffprobe_inspect = [
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current_app.config['BIN_FFPROBE'],
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'-loglevel',
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'error',
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'-show_streams',
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filepath,
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'-print_format',
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'json']
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ffprobe_ouput = json.loads(subprocess.check_output(ffprobe_inspect))
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video_stream = None
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# Loop throught audio and video streams searching for the video
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for stream in ffprobe_ouput['streams']:
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if stream['codec_type'] == 'video':
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video_stream = stream
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if video_stream:
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# If video is webm we can't get the duration (seems to be an ffprobe
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# issue)
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if video_stream['codec_name'] == 'vp8':
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duration = None
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else:
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duration = int(float(video_stream['duration']))
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outdata = dict(
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duration=duration,
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res_x=video_stream['width'],
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res_y=video_stream['height'],
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)
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if video_stream['sample_aspect_ratio'] != '1:1':
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print '[warning] Pixel aspect ratio is not square!'
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return outdata
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def ffmpeg_encode(src, format, res_y=720):
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# The specific FFMpeg command, called multiple times
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args = []
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args.append("-i")
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args.append(src)
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if format == 'mp4':
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# Example mp4 encoding
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# ffmpeg -i INPUT -vcodec libx264 -pix_fmt yuv420p -preset fast -crf 20
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# -acodec libfdk_aac -ab 112k -ar 44100 -movflags +faststart OUTPUT
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args.extend([
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'-threads', '1',
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'-vf', 'scale=-2:{0}'.format(res_y),
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'-vcodec', 'libx264',
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'-pix_fmt', 'yuv420p',
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'-preset', 'fast',
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'-crf', '20',
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'-acodec', 'libfdk_aac', '-ab', '112k', '-ar', '44100',
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'-movflags', '+faststart'])
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elif format == 'webm':
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# Example webm encoding
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# ffmpeg -i INPUT -vcodec libvpx -g 120 -lag-in-frames 16 -deadline good
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# -cpu-used 0 -vprofile 0 -qmax 51 -qmin 11 -slices 4 -b:v 2M -f webm
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args.extend([
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'-vf', 'scale=-2:{0}'.format(res_y),
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'-vcodec', 'libvpx',
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'-g', '120',
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'-lag-in-frames', '16',
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'-deadline', 'good',
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'-cpu-used', '0',
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'-vprofile', '0',
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'-qmax', '51', '-qmin', '11', '-slices', '4', '-b:v', '2M',
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# '-acodec', 'libmp3lame', '-ab', '112k', '-ar', '44100',
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'-f', 'webm'])
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if not os.environ.get('VERBOSE'):
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args.extend(['-loglevel', 'quiet'])
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dst = os.path.splitext(src)
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dst = "{0}-{1}p.{2}".format(dst[0], res_y, format)
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args.append(dst)
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print "Encoding {0} to {1}".format(src, format)
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returncode = subprocess.call([current_app.config['BIN_FFMPEG']] + args)
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if returncode == 0:
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print "Successfully encoded {0}".format(dst)
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else:
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print "Error during encode"
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print "Code: {0}".format(returncode)
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print "Command: {0}".format(current_app.config['BIN_FFMPEG'] + " " + " ".join(args))
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dst = None
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# return path of the encoded video
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return dst
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