def generate_master_playlist(channel):
"""Returns a HLS master playlist for the given channel.
Takes optional params:
start, end: The time to begin and end the stream at.
See generate_media_playlist for details.
"""
start = dateutil.parse_utc_only(
request.args['start']) if 'start' in request.args else None
end = dateutil.parse_utc_only(
request.args['end']) if 'end' in request.args else None
qualities = listdir(os.path.join(app.static_folder, channel))
playlists = {}
for quality in qualities:
# If start or end are given, try to restrict offered qualities to ones which exist for that
# time range.
if start is not None or end is not None:
first, last = time_range_for_quality(channel, quality)
if start is not None and last < start:
continue # last time for quality is before our start time, don't offer quality
if end is not None and end < first:
continue # our end time is before first time for quality, don't offer quality
playlists[quality] = url_for('generate_media_playlist',
channel=channel,
quality=quality,
**request.args)
return generate_hls.generate_master(playlists)
def generate_waveform(channel, quality):
"""
Returns a PNG image showing the audio waveform over the requested time period.
Params:
start, end: Required. The start and end times.
Must be in ISO 8601 format (ie. yyyy-mm-ddTHH:MM:SS) and UTC.
The returned image may extend beyond the requested start and end times by a few seconds.
size: The image size to render in form WIDTHxHEIGHT. Default 1024x64.
"""
start = dateutil.parse_utc_only(request.args['start'])
end = dateutil.parse_utc_only(request.args['end'])
if end <= start:
return "End must be after start", 400
if end - start > datetime.timedelta(hours=6):
return "Range may not be longer than 6 hours", 400
size = request.args.get('size', '1024x64')
try:
width, height = map(int, size.split('x'))
except ValueError:
return "Invalid size", 400
if not ((0 < width <= 4096) and (0 < height <= 4096)):
return "Image size must be between 1x1 and 4096x4096", 400
hours_path = os.path.join(app.static_folder, channel, quality)
if not os.path.isdir(hours_path):
abort(404)
segments = get_best_segments(hours_path, start, end)
if not any(segment is not None for segment in segments):
return "We have no content available within the requested time range.", 406
return Response(render_segments_waveform(segments, (width, height)),
mimetype='image/png')
def generate_media_playlist(channel, quality): """Returns a HLS media playlist for the given channel and quality. Takes optional params: start, end: The time to begin and end the stream at. Must be in ISO 8601 format (ie. yyyy-mm-ddTHH:MM:SS) and UTC. If not given, effectively means "infinity", ie. no start means any time ago, no end means any time in the future. Note that because it returns segments _covering_ that range, the playlist may start slightly before and end slightly after the given times. """ hours_path = os.path.join(app.static_folder, channel, quality) if not os.path.isdir(hours_path): abort(404) start = dateutil.parse_utc_only(request.args['start']) if 'start' in request.args else None end = dateutil.parse_utc_only(request.args['end']) if 'end' in request.args else None if start is None or end is None: # If start or end are not given, use the earliest/latest time available first, last = time_range_for_quality(channel, quality) if start is None: start = first if end is None: end = last # get_best_segments requires start be before end, special case that as no segments # (not an error because someone might ask for a specific start, no end, but we ended up with # end before start because that's the latest time we have) if start < end: segments = get_best_segments(hours_path, start, end) else: # Note the None to indicate there was a "hole" at both start and end segments = [None] return generate_hls.generate_media(segments, os.path.join(app.static_url_path, channel, quality))
def cut(channel, quality):
"""Return a MPEGTS video file covering the exact timestamp range.
Params:
start, end: Required. The start and end times, down to the millisecond.
Must be in ISO 8601 format (ie. yyyy-mm-ddTHH:MM:SS) and UTC.
allow_holes: Optional, default false. If false, errors out with a 406 Not Acceptable
if any holes are detected, rather than producing a video with missing parts.
Set to true by passing "true" (case insensitive).
Even if holes are allowed, a 406 may result if the resulting video would be empty.
type: One of "fast" or "full". Default to "fast".
A fast cut is much faster but minor artifacting may be present near the start and end.
A fast cut is encoded as MPEG-TS, a full as mp4.
"""
start = dateutil.parse_utc_only(request.args['start'])
end = dateutil.parse_utc_only(request.args['end'])
if end <= start:
return "End must be after start", 400
allow_holes = request.args.get('allow_holes', 'false').lower()
if allow_holes not in ["true", "false"]:
return "allow_holes must be one of: true, false", 400
allow_holes = (allow_holes == "true")
hours_path = os.path.join(app.static_folder, channel, quality)
if not os.path.isdir(hours_path):
abort(404)
segments = get_best_segments(hours_path, start, end)
if not allow_holes and None in segments:
return "Requested time range contains holes or is incomplete.", 406
if not any(segment is not None for segment in segments):
return "We have no content available within the requested time range.", 406
type = request.args.get('type', 'fast')
if type == 'fast':
return Response(fast_cut_segments(segments, start, end), mimetype='video/MP2T')
elif type == 'full':
# output as mp4 with no more specific encoding args
return Response(full_cut_segments(segments, start, end, ['-f', 'mp4']), mimetype='video/mp4')
else:
return "Unknown type {!r}. Must be 'fast' or 'full'.".format(type), 400
def cut(channel, quality):
"""Return a MPEGTS video file covering the exact timestamp range.
Params:
start, end: Required. The start and end times, down to the millisecond.
Must be in ISO 8601 format (ie. yyyy-mm-ddTHH:MM:SS) and UTC.
allow_holes: Optional, default false. If false, errors out with a 406 Not Acceptable
if any holes are detected, rather than producing a video with missing parts.
Set to true by passing "true" (case insensitive).
Even if holes are allowed, a 406 may result if the resulting video would be empty.
type: One of:
"rough": A direct concat, like a fast cut but without any ffmpeg.
It may extend beyond the requested start and end times by a few seconds.
"fast": Very fast but with minor artifacting where the first and last segments join
the other segments.
"mpegts": A full cut to a streamable mpegts format. This consumes signifigant server
resources, so please use sparingly.
"mp4": As mpegts, but encodes as MP4. This format must be buffered to disk before
sending so it's a bit slower.
"""
start = dateutil.parse_utc_only(
request.args['start']) if 'start' in request.args else None
end = dateutil.parse_utc_only(
request.args['end']) if 'end' in request.args else None
if start is None or end is None:
# If start or end are not given, use the earliest/latest time available
first, last = time_range_for_quality(channel, quality)
if start is None:
start = first
if end is None:
end = last
if end <= start:
return "End must be after start", 400
allow_holes = request.args.get('allow_holes', 'false').lower()
if allow_holes not in ["true", "false"]:
return "allow_holes must be one of: true, false", 400
allow_holes = (allow_holes == "true")
hours_path = os.path.join(app.static_folder, channel, quality)
if not os.path.isdir(hours_path):
abort(404)
segments = get_best_segments(hours_path, start, end)
if not allow_holes and None in segments:
return "Requested time range contains holes or is incomplete.", 406
if not any(segment is not None for segment in segments):
return "We have no content available within the requested time range.", 406
type = request.args.get('type', 'fast')
if type == 'rough':
return Response(rough_cut_segments(segments, start, end),
mimetype='video/MP2T')
elif type == 'fast':
return Response(fast_cut_segments(segments, start, end),
mimetype='video/MP2T')
elif type == 'smart':
return Response(smart_cut_segments(segments, start, end),
mimetype='video/MP2T')
elif type in ('mpegts', 'mp4'):
if type == 'mp4':
return "mp4 type has been disabled due to the load it causes", 400
# encode as high-quality, without wasting too much cpu on encoding
stream, muxer, mimetype = (True, 'mpegts',
'video/MP2T') if type == 'mpegts' else (
False, 'mp4', 'video/mp4')
encoding_args = [
'-c:v', 'libx264', '-preset', 'ultrafast', '-crf', '0', '-f', muxer
]
return Response(full_cut_segments(segments,
start,
end,
encoding_args,
stream=stream),
mimetype=mimetype)
else:
return "Unknown type {!r}".format(type), 400
def generate_videos(channel, quality):
"""
Takes a JSON body {name: [start, end]} where start and end are timestamps.
Creates files CHANNEL_QUALITY_NAME_N.mkv for each contiguous range of segments
in that hour range (ie. split at holes) and saves them in the segments directory.
"""
videos = request.json
for name, (start, end) in videos.items():
start = dateutil.parse_utc_only(start)
end = dateutil.parse_utc_only(end)
# protect against directory traversal
if "/" in name:
return "Name cannot contain /", 400
if end <= start:
return "End must be after start", 400
hours_path = os.path.join(app.static_folder, channel, quality)
if not os.path.isdir(hours_path):
abort(404)
segments = get_best_segments(hours_path, start, end)
contiguous = []
n = 0
logging.info(
"Generating contiguous videos {!r} for {}/{} from {} to {}".format(
name,
channel,
quality,
start,
end,
))
def write_file(segments, n):
output_name = os.path.join(
app.static_folder,
'{}_{}_{}_{}.mkv'.format(channel, quality, name, n))
if os.path.exists(output_name):
logging.info(
"Skipping generating hours video - already exists")
return
temp_name = os.path.join(app.static_folder,
"temp-{}.mkv".format(uuid4()))
args = [
'ffmpeg',
'-hide_banner',
'-loglevel',
'error', # suppress noisy output
'-i',
'-',
'-c',
'copy',
temp_name,
]
logging.info("Generating video with args: {}".format(
" ".join(args)))
proc = None
try:
proc = subprocess.Popen(args, stdin=subprocess.PIPE)
# feed_input will write all the segments and close stdin
feed_input(segments, proc.stdin)
# now wait for it to finish and check errors
if proc.wait() != 0:
raise Exception("ffmpeg exited {}".format(proc.returncode))
os.rename(temp_name, output_name)
finally:
if os.path.exists(temp_name):
os.remove(temp_name)
for segment in segments:
if segment is not None:
contiguous.append(segment)
continue
if contiguous:
write_file(contiguous, n)
n += 1
contiguous = []
if contiguous:
write_file(contiguous, n)
return ''
def cut(channel, quality):
"""Return a MPEGTS video file covering the exact timestamp range.
Params:
start, end: The start and end times, down to the millisecond.
Must be in ISO 8601 format (ie. yyyy-mm-ddTHH:MM:SS) and UTC.
If not given (and ranges not given), will use the earliest/latest data available.
range: A pair "START,END" which are formatted as per start and end args.
Overrides "start" and "end" options.
This option may be given multiple times.
The final video will consist of all the ranges cut back to back,
in the order given, with hard cuts between each range.
allow_holes: Optional, default false. If false, errors out with a 406 Not Acceptable
if any holes are detected, rather than producing a video with missing parts.
Set to true by passing "true" (case insensitive).
Even if holes are allowed, a 406 may result if the resulting video (or any individual
range) would be empty.
type: One of:
"rough": A direct concat, like a fast cut but without any ffmpeg.
It may extend beyond the requested start and end times by a few seconds.
"fast": Very fast but with minor artifacting where the first and last segments join
the other segments.
"mpegts": A full cut to a streamable mpegts format. This consumes signifigant server
resources, so please use sparingly.
"""
if 'range' in request.args:
parts = [part.split(',') for part in request.args.getlist('range')]
ranges = [(dateutil.parse_utc_only(start),
dateutil.parse_utc_only(end)) for start, end in parts]
else:
start = dateutil.parse_utc_only(
request.args['start']) if 'start' in request.args else None
end = dateutil.parse_utc_only(
request.args['end']) if 'end' in request.args else None
if start is None or end is None:
# If start or end are not given, use the earliest/latest time available
first, last = time_range_for_quality(channel, quality)
if start is None:
start = first
if end is None:
end = last
ranges = [(start, end)]
for start, end in ranges:
if end <= start:
return "Ends must be after starts", 400
allow_holes = request.args.get('allow_holes', 'false').lower()
if allow_holes not in ["true", "false"]:
return "allow_holes must be one of: true, false", 400
allow_holes = (allow_holes == "true")
hours_path = os.path.join(app.static_folder, channel, quality)
if not os.path.isdir(hours_path):
abort(404)
segment_ranges = []
for start, end in ranges:
segments = get_best_segments(hours_path, start, end)
if not allow_holes and None in segments:
return "Requested time range contains holes or is incomplete.", 406
if not any(segment is not None for segment in segments):
return "We have no content available within the requested time range.", 406
segment_ranges.append(segments)
type = request.args.get('type', 'fast')
if type == 'rough':
return Response(rough_cut_segments(segment_ranges, ranges),
mimetype='video/MP2T')
elif type == 'fast':
return Response(fast_cut_segments(segment_ranges, ranges),
mimetype='video/MP2T')
elif type in ('mpegts', 'mp4'):
if type == 'mp4':
return "mp4 type has been disabled due to the load it causes", 400
# encode as high-quality, without wasting too much cpu on encoding
stream, muxer, mimetype = (True, 'mpegts',
'video/MP2T') if type == 'mpegts' else (
False, 'mp4', 'video/mp4')
encoding_args = [
'-c:v', 'libx264', '-preset', 'ultrafast', '-crf', '0', '-f', muxer
]
if len(ranges) > 1:
return "full cut does not support multiple ranges at this time", 400
start, end = ranges[0]
return Response(full_cut_segments(segment_ranges[0],
start,
end,
encoding_args,
stream=stream),
mimetype=mimetype)
else:
return "Unknown type {!r}".format(type), 400
