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import os
import logging
import mimetypes
from datetime import datetime
from functools import partial
from flask import Blueprint, render_template, abort, \
url_for, Response, request
from . import ffmpeg
class cached(object):
"""
@cached(cache=cache, keyfunc=lambda path: path)
def function(path):
...
"""
def __init__(self, cache=None, keyfunc=None):
assert cache, 'cache parameter must be set'
assert keyfunc, 'keyfunc parameter must be set'
self.cache = cache
self.keyfunc = keyfunc
def __call__(self, func):
def wrapped_func(*args, **kwargs):
key = self.keyfunc(*args, **kwargs)
cached_value = self.cache.get(key)
if cached_value is not None:
return cached_value
else:
value = func(*args, **kwargs)
self.cache.set(key, value)
return value
return wrapped_func
def build(root_directory, cache):
blueprint = Blueprint('mediabrowser', __name__, static_folder='assets',
template_folder='templates')
@cached(cache=cache, keyfunc=lambda ospath: ospath)
def splittimes_cached(ospath):
return list(ffmpeg.calculate_splittimes(ospath, 50))
@cached(cache=cache, keyfunc=lambda path: "ffprobe_{}".format(path))
def ffprobe(path):
try:
data = ffmpeg.ffprobe_data(path)
if 'format' not in data or \
'duration' not in data['format']:
logging.warning('analysis failed for %s: Incomplete data', path)
return None
else:
return data
except:
logging.warning('ffprobe failed for %s', path)
return None
@cached(cache=cache, keyfunc=lambda path: "is_video_{}".format(path))
def get_video_mime_type(path):
"""
:return: mime type if path is video file or None otherwise
"""
fallback = {
'.mkv': 'video/x-matroska',
'.avi': 'video/avi',
'.webm': 'video/webm',
'.flv': 'video/x-flv',
'.mp4': 'video/mp4',
'.mpg': 'video/mp2t'}
(filetype, encoding) = mimetypes.guess_type(path)
if filetype is None:
_, extension = os.path.splitext(path)
if extension in fallback.keys():
return fallback[extension]
else:
return None
else:
if filetype.startswith('video/'):
return filetype
else:
return None
@blueprint.route('/assets/<path:filename>')
def assets(filename):
return blueprint.send_static_file(filename)
@blueprint.route('/<path:path>/stream/<float:ss>_<float:t>')
def stream(ss, t, path):
path = os.path.normpath(path)
ospath = os.path.join(root_directory, path)
data = ffprobe(ospath)
duration = float(data['format']['duration'])
# cut at next key frame after given time 'ss'
_, new_ss = ffmpeg.find_next_keyframe(ospath, ss, t / 2)
if ss + t * 2 > duration:
# encode all remain frames at once
new_t = duration - new_ss
else:
# find next key frame after given time 't'
new_t_prev_duration, new_t = ffmpeg.find_next_keyframe(ospath, ss + t, t / 2)
new_t -= new_ss
# minus one frame
new_t -= new_t_prev_duration
process = ffmpeg.stream(ospath, new_ss, new_t)
return Response(process.stdout, mimetype='video/MP2T')
@blueprint.route('/<path:path>/m3u8')
def m3u8(path):
path = os.path.normpath(path)
ospath = os.path.join(root_directory, path)
max_chunk_duration = 60
splittimes = splittimes_cached(ospath)
buf = '#EXTM3U\n'
buf += '#EXT-X-VERSION:3\n'
buf += '#EXT-X-TARGETDURATION:{}\n'.format(max_chunk_duration)
buf += '#EXT-X-MEDIA-SEQUENCE:0\n'
for (pos, chunk_duration) in splittimes:
buf += "#EXTINF:{},\n".format(chunk_duration)
buf += "stream/{}_{}\n".format(pos, chunk_duration)
buf += '#EXT-X-ENDLIST\n'
return Response(buf, mimetype='application/x-mpegurl')
@blueprint.route('/<path:path>/thumbnail')
def thumbnail(path):
path = os.path.normpath(path)
ospath = os.path.join(root_directory, path)
client_mtime = request.if_modified_since
mtime = datetime.fromtimestamp(os.stat(ospath).st_mtime)
if client_mtime is not None and mtime <= client_mtime:
return Response(status=304)
else:
process = ffmpeg.thumbnail_png(ospath, 64)
r = Response(process.stdout, mimetype="image/png")
r.last_modified = mtime
return r
@blueprint.route('/<path:path>/download/inline')
def download_inline(path):
return download(path, inline=True)
@blueprint.route('/<path:path>/download')
def download(path, inline=False):
path = os.path.normpath(path)
ospath = os.path.join(root_directory, path)
filename = os.path.basename(path)
mime_type = get_video_mime_type(ospath)
if not mime_type:
return Response(status=501, response=b'Not a video file')
r = Response(open(ospath, 'rb'), mimetype=mime_type)
if inline:
r.headers['Content-Disposition'] = "inline; filename=\"{}\"".format(filename)
else:
r.headers['Content-Disposition'] = "attachment; filename=\"{}\"".format(filename)
return r
@blueprint.route('/<path:path>/watch')
def watch(path):
path = os.path.normpath(path)
filename = os.path.basename(path)
return render_template('watch.html',
path=path, filename=filename)
@blueprint.route('/', defaults={'path': ''})
@blueprint.route('/<path:path>/list')
def listdir(path):
def gather_fileinfo(path, ospath, filename):
osfilepath = os.path.join(ospath, filename)
if os.path.isdir(osfilepath) and not filename.startswith('.'):
return {'type': 'directory', 'filename': filename,
'link': url_for('mediabrowser.listdir',
path=os.path.join(path, filename))}
else:
if not get_video_mime_type(osfilepath):
return None
else:
return {
'type': 'file', 'filename': filename,
'fullpath': os.path.join(path, filename)}
try:
path = os.path.normpath(path)
ospath = os.path.join(root_directory, path)
files = list(
map(partial(gather_fileinfo, path, ospath), os.listdir(ospath)))
files = list(filter(lambda file: file is not None, files))
files.sort(key=lambda i: (i['type'] == 'file' and '1' or '0') + i['filename'].lower())
return render_template('listdir.html',
files=files,
parent=os.path.dirname(path),
path=path)
except FileNotFoundError:
abort(404)
return blueprint
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