bibencode_encode.py
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bibencode_encode.py
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	# -- coding: utf-8 --
	##
	## This file is part of Invenio.
	## Copyright (C) 2011 CERN.
	##
	## Invenio is free software; you can redistribute it and/or
	## modify it under the terms of the GNU General Public License as
	## published by the Free Software Foundation; either version 2 of the
	## License, or (at your option) any later version.
	##
	## Invenio is distributed in the hope that it will be useful, but
	## WITHOUT ANY WARRANTY; without even the implied warranty of
	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	## General Public License for more details.
	##
	## You should have received a copy of the GNU General Public License
	## along with Invenio; if not, write to the Free Software Foundation, Inc.,
	## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

	"""BibEncode encoding submodule"""

	from invenio.bibtask import (
	write_message,
	task_update_progress,
	)
	from invenio.bibencode_config import (
	CFG_BIBENCODE_FFMPEG_ENCODING_LOG,
	CFG_BIBENCODE_FFMPEG_PASSLOGFILE_PREFIX,
	CFG_BIBENCODE_FFMPEG_METADATA_ARGUMENT,
	CFG_BIBENCODE_FFMPEG_ENCODE_TIME
	)
	from invenio.bibencode_utils import (
	timecode_to_seconds,
	generate_timestamp,
	chose,
	getval,
	aspect_string_to_float
	)
	from invenio.bibencode_profiles import get_encoding_profile
	from invenio.bibencode_metadata import (
	ffprobe_metadata,
	mediainfo_metadata
	)
	from invenio.config import CFG_PATH_FFMPEG
	import time
	import os
	import subprocess
	import uuid

	def _filename_log(output_filename, nofpass=1):
	""" Constructs the filename including path for the encoding err file
	@param output_filename: name of the video file to be created
	@type output_filename: string
	@param nofpass: number of encoding passes
	@type nofpass: int
	@return: the constructed log filename
	@rtype: string
	"""
	fname = os.path.split(output_filename)[1]
	fname = os.path.splitext(fname)[0]
	return CFG_BIBENCODE_FFMPEG_ENCODING_LOG % (generate_timestamp() +
	"_" + fname + "_%d" % nofpass)

	def determine_aspect(input_file):
	""" Checks video metadata to find the display aspect ratio.
	Returns None if the DAR is not stored in the video container.

	@param input_file: full path of the video
	@type input_file: string
	"""
	videoinfo = ffprobe_metadata(input_file)
	if not videoinfo:
	return None
	for stream in videoinfo['streams']:
	if stream['codec_type'] == 'video':
	fwidth = int(stream['width'])
	fheight = int(stream['height'])
	if 'display_aspect_ratio' in stream:
	return (stream['display_aspect_ratio'], fwidth, fheight)
	return (None, fwidth, fheight)

	def determine_resolution_preserving_aspect(input_file, width=None,
	height=None, aspect=None):
	""" Determines the right resolution for a given width or height while
	preserving the aspect ratio.
	@param input_file: full path of the video
	@type input_file: string
	@param width: The proposed width for the new size.
	@type width: int
	@param height: The proposed height for the new size
	@type height: int
	@param aspect: Override aspect ratio determined from the input file
	@type aspect: float or "4:3" like string
	@return: An FFMPEG compatible size string '640x480'
	@rtype: string
	"""

	def _make_even(number):
	""" Resolutions need to be even numbers for some video encoders.
	We simply increase the resulution by one pixel if it is not even.
	"""
	if number % 2 != 0:
	return number+1
	else:
	return number

	if aspect:
	if type(aspect) == type(str()):
	aspect_ratio = aspect_string_to_float(aspect)
	elif type(aspect) == type(float()):
	aspect_ratio = aspect
	else:
	raise ValueError
	else:
	aspect_ratio_tuple = determine_aspect(input_file)
	if aspect_ratio_tuple[0] is None:
	aspect_ratio = float(aspect_ratio_tuple[1]) / float(aspect_ratio_tuple[2])
	else:
	aspect_ratio = aspect_string_to_float(aspect_ratio_tuple[0])

	nresolution = None
	if width and not height:
	## The resolution hast to fit exactly the width
	nheight = int(width / aspect_ratio)
	nheight = _make_even(nheight)
	nresolution = "%dx%d" % (width, nheight)
	elif height and not width:
	## The resolution hast to fit exactly the height
	nwidth = int(height * aspect_ratio)
	nwidth = _make_even(nwidth)
	nresolution = "%dx%d" % (nwidth, height)
	elif width and height:
	## The resolution hast to be within both parameters, seen as a maximum
	nwidth = width
	nheight = height
	new_aspect_ratio = float(width) / float(height)
	if aspect_ratio > new_aspect_ratio:
	nheight = int(width / aspect_ratio)
	else:
	nwidth = int(height * aspect_ratio)
	nheight = _make_even(nheight)
	nwidth = _make_even(nwidth)
	nresolution = "%dx%d" % (nwidth, nheight)
	else:
	## Return the original size in square pixels
	## original height * aspect_ratio
	nwidth = aspect_ratio_tuple[2] * aspect_ratio
	nwidth = _make_even(nwidth)
	nresolution = "%dx%d" % (nwidth, aspect_ratio_tuple[2])
	return nresolution

	def assure_quality(input_file, aspect=None, target_width=None,
	target_height=None, target_bitrate=None,
	accept_anamorphic=True, tolerance=0.95):
	"""
	Checks if the original video material would support the target resolution
	and/or bitrate.
	@param input_file: full path of the video to check
	@type input_file: string
	@param aspect: the aspect ratio as override
	@type aspect: float
	@param target_width: width of the new video
	@type target_width: int
	@param target_height: height of the new video
	@type target_height: int
	@param target_bitrate: bitrate of the new video in bit/s.
	@type target_bitrate: int
	@param dismiss_aspect: do not care about the aspect
	@type dismiss_aspect: bool
	@return: 1 if the video supports the quality, 0 if not
	@rtype: bool
	"""
	if target_bitrate:
	target_bitrate = int(target_bitrate * tolerance)
	if target_height:
	target_height = int(target_height * tolerance)
	if target_width:
	target_width = int (target_width * tolerance)

	## First get the size and aspect using ffprobe
	## ffprobe is more reliable in this case then mediainfo
	aspect_ratio_tuple = determine_aspect(input_file)
	fwidth = aspect_ratio_tuple[1]
	fheight = aspect_ratio_tuple[2]
	if not aspect:
	aspect = aspect_ratio_tuple[0]

	## Get the bitrate with mediainfo now, because it is more realiable
	## than ffprobe in this case
	fbitrate = None
	videoinfo = mediainfo_metadata(input_file)
	for track in videoinfo:
	if track['kind_of_stream'] == 'Video':
	fbitrate = getval(track, 'bit_rate')
	break
	if fbitrate:
	fbitrate = int(fbitrate)

	# This adapts anamorphic videos.
	# If it is stored anamorphic, calculate the real width from the height
	# we can use our determine_resolution function for this
	if accept_anamorphic and aspect:
	fwidth = determine_resolution_preserving_aspect(
	input_file=input_file,
	width=None,
	height=fheight,
	aspect=aspect).split('x')[0]
	fwidth = int(fwidth)
	if target_height and target_width:
	if target_width > fwidth or target_height > fheight:
	return False
	elif target_height:
	if target_height > fheight:
	return False
	elif target_width:
	if target_width > fwidth:
	return False
	if target_bitrate:
	## If the video bitrate is unreadable, assume it is ok and our library
	## has problems reading it out
	if fbitrate and target_bitrate > fbitrate:
	return False
	return True


	def encode_video(input_file, output_file,
	acodec=None, vcodec=None,
	abitrate=None, vbitrate=None,
	resolution=None,
	passes=1,
	special=None, specialfirst=None, specialsecond=None,
	metadata=None,
	width=None, height=None, aspect=None,
	profile=None,
	update_fnc=task_update_progress,
	message_fnc=write_message
	):
	""" Starts an ffmpeg encoding process based on the given parameters.
	The encoding is run as a subprocess. The progress of the subprocess is
	continiously written to the given messaging functions. In a normale case,
	these should be the ones of BibTask.

	@param input_file: Path to the input video.
	@type input_file: string

	@param output_file: Path to the output file. If no other parameters are giv
	than input and output files, FFmpeg tries to auto-discover the right codecs
	for the given file extension. In this case, every other aspect like
	resolution and bitrates will be the same as in the input video.
	@type output_file: string

	@param acodec: The audio codec to use. This must be an available codec of
	libavcodec within FFmpeg.
	@type acodec: string

	@param vcodec: The video codec to use. This must be an available codec of
	libavcodec within FFmpeg.
	@type vcodec: string

	@param abitrate: Bitrate of the audio stream. In bit/s.
	@type abitrate: int

	@param vbitrate: Bitrate of the video stream. In bit/s.
	@type vbitrate: int

	@param resolution: Fixed size of the frames in the transcoded video.
	FFmpeg notation: 'WxH' or preset like 'vga'. See also 'width'

	@param passes: Number of encoding passes. Either 1 or 2.
	@type passes: int

	@param special: Additional FFmpeg parameters.
	@type special: string

	@param specialfirst: Additional FFmpeg parameters for the first pass.
	The 'special' parameter is ignored if this ist not 'None'
	@type specialfirst: string

	@param specialsecond: Additional FFmpeg parameters for the second pass.
	The 'special' parameter is ignored if this is not 'None'
	@type specialsecond: string

	@param metadata: Metadata that should be added to the transcoded video.
	This must be a dictionary. As with as metadata in FFmpeg, there is no
	guarantee that the metadata specified in the dictionary will really be added
	to the file, because it will largelydepend on the container format and its
	supported fields.
	@type metadata: dict

	@param width: Instead of giving a fixed resolution, you can use width and
	height as dimensional constrains. The algorithm will try to preserve the
	original aspect and fit the new frame size into the given dimensions.
	@type width: int

	@param height: see 'width'
	@type height: int

	@param aspect: A float representing the aspect ratio of the video:
	4:3 equals 1.33 and 16:9 equals 1.77.
	This is a fallback in case the algorithm fails to determine the real aspect
	ratio from the video. See also 'width'
	@type aspect: float or "4:3" like string

	@param profile: A profile to use. The priority is on the parameters
	directly given to the function.
	@type profile: string

	@param update_fnc: A function called to display or log an the encoding
	status. This function must accept a string.
	@type update_fnc: function

	@param message_fnc: A function to log important messages or errors.
	This function must accept a string.
	@type message_fnc: function

	@return: True if the encoding was successful, False if not
	@rtype: boolean
	"""

	def encode():
	""" Subfunction to run the acutal encoding
	"""
	## Start process
	process = subprocess.Popen(command,
	stderr=log_file_handle,
	close_fds=True)
	## While the process is running
	time.sleep(1)
	while process.poll() is None:
	# Update the status in bibsched
	update_status()
	time.sleep(4)
	## If the process was terminated
	if process.poll() == -15:
	# Encoding was terminated by system
	message_fnc("FFMPEG was terminated")
	update_fnc(" FFMPEG was terminated")
	return 0
	## If there was an error during encoding
	if process.poll() == 1:
	update_fnc(" An FFMPEG error has appeared, see log")
	message_fnc("An FFMPEG error has appeared encoding %s" % output_file)
	message_fnc("Command was: %s" % ' '.join(command))
	message_fnc("Last lines of the FFmpeg log:")
	## open the logfile again an retrieve the size
	log_file_handle2 = open(log_file_name, 'rb')
	size = os.fstat(log_file_handle2.fileno())[6]
	## Read the last lines
	log_file_handle2.seek(-min(size, 10000), 2)
	lastlines = log_file_handle2.read().splitlines()[-5:]
	for line in lastlines:
	message_fnc(line)
	return 0
	## If everything went fine
	if process.poll() == 0:
	message_fnc("Encoding of %s done" % output_file)
	update_fnc("Encoding of %s done" % output_file)
	return 1

	def build_command(nofpass=1):
	""" Builds the ffmpeg command according to the function params
	"""
	def insert(key, value):
	""" Shortcut for inserting parameters into the arg list
	"""
	base_args.insert(-1, key)
	base_args.insert(-1, value)

	## Determine base command arguments from the pass to run
	base_args = None
	if passes == 1:
	base_args = [CFG_PATH_FFMPEG, '-y', '-i', input_file, output_file]
	elif passes == 2:
	if nofpass == 1:
	base_args = [CFG_PATH_FFMPEG, '-y', '-i', input_file,
	'-pass', '1', '-passlogfile', pass_log_file,
	'-an', '-f', 'rawvideo', '/dev/null']
	elif nofpass == 2:
	base_args = [CFG_PATH_FFMPEG, '-y', '-i', input_file,
	'-pass', '2', '-passlogfile',
	pass_log_file, output_file]
	## Insert additional arguments
	if acodec is not None:
	insert('-acodec', acodec)
	if vcodec is not None:
	insert('-vcodec', vcodec)
	if abitrate is not None:
	insert('-ab', str(abitrate))
	if vbitrate is not None:
	insert('-b', str(vbitrate))

	## If a resolution is given
	if resolution:
	insert('-s', resolution)
	## If not, you can give width and height and generate the resolution
	else:
	## Use our new function to get the size of the input
	nresolution = determine_resolution_preserving_aspect(input_file,
	width,
	height,
	aspect)
	insert('-s', nresolution)
	## Metadata additions
	if type(metadata) is type(dict()):
	## build metadata arguments for ffmpeg
	for key, value in metadata.iteritems():
	if value is not None:
	meta_arg = (
	CFG_BIBENCODE_FFMPEG_METADATA_ARGUMENT % (key, value)
	)
	insert("-metadata", meta_arg)
	## Special argument additions
	if passes == 1:
	if passes == 1 and special is not None:
	for val in special.split():
	base_args.insert(-1, val)
	elif passes == 2:
	if nofpass == 1:
	if specialfirst is not None:
	for val in specialfirst.split():
	base_args.insert(-1, val)
	if nofpass == 2:
	if specialsecond is not None:
	for val in specialsecond.split():
	base_args.insert(-1, val)
	return base_args

	def update_status():
	""" Parses the encoding status and updates the task in bibsched
	"""

	def graphical(value):
	""" Converts a percentage value to a nice graphical representation
	"""
	## If the given value is a valid precentage
	if value >= 0 and value <= 100:
	## This is to get nice, aligned output in bibsched
	oval = str(value).zfill(3)
	return (
	"[" + "#"(value/10) + " "(10-(value/10)) +
	"][%d/%d] %s%%" % (nofpass, passes, oval)
	)
	else:
	## Sometimes the parsed values from FFMPEG are totaly off.
	## Or maybe nneeded values are not avail. for the given video.
	## In this case there is no estimate.
	return "[ no est. ][%d/%d] " % (nofpass, passes)

	## init variables
	time_string = '0.0'
	percentage_done = -1
	## try to read the encoding log
	try:
	filehandle = open(log_file_name, 'rb')
	except IOError:
	message_fnc("Error opening %s" % log_file_name)
	update_fnc("Could not open encoding log")
	return
	## Check the size of the file before reading from the end
	size = os.path.getsize(log_file_name)
	if not size:
	return
	## Go to the end of the log
	filehandle.seek(-min(10000, size), 2)
	chunk = filehandle.read()
	lines = chunk.splitlines()

	## try to parse the status
	for line in reversed(lines):
	if CFG_BIBENCODE_FFMPEG_ENCODE_TIME.match(line):
	time_string = (
	CFG_BIBENCODE_FFMPEG_ENCODE_TIME.match(line).groups()
	)[0]
	break
	filehandle.close()
	try:
	percentage_done = int(timecode_to_seconds(time_string) / total_seconds * 100)
	except:
	precentage_done = -1
	## Now update the bibsched progress
	opath, ofile = os.path.split(output_file)
	if len(opath) > 8:
	opath = "..." + opath[-8:]
	ohint = opath + '/' + ofile
	update_fnc(graphical(percentage_done) + " > " + ohint)

	#------------------#
	# PROFILE HANDLING #
	#------------------#

	if profile:
	profile = get_encoding_profile(profile)
	acodec = chose(acodec, 'audiocodec', profile)
	vcodec = chose(vcodec, 'videocodec', profile)
	abitrate = chose(abitrate, 'audiobitrate', profile)
	vbitrate = chose(vbitrate, 'videobitrate', profile)
	resolution = chose(resolution, 'resolution', profile)
	passes = getval(profile, 'passes', 1)
	special = chose(special, 'special', profile)
	specialfirst = chose(specialfirst, 'special_firstpass', profile)
	specialsecond = chose(specialsecond, 'special_secondpass', profile)
	metadata = chose(metadata, 'metadata', profile)
	width = chose(width, 'width', profile)
	height = chose(height, 'height', profile)
	aspect = chose(aspect, 'aspect', profile)

	#----------#
	# ENCODING #
	#----------#

	## Mark Task as stoppable
	# task_sleep_now_if_required()

	tech_metadata = ffprobe_metadata(input_file)
	try:
	total_seconds = float(tech_metadata['format']['duration'])
	except:
	total_seconds = 0.0


	## Run the encoding
	pass_log_file = CFG_BIBENCODE_FFMPEG_PASSLOGFILE_PREFIX % (
	os.path.splitext(os.path.split(input_file)[1])[0],
	str(uuid.uuid4()))
	no_error = True
	## For every encoding pass to do
	for apass in range(0, passes):
	nofpass = apass + 1
	if no_error:
	## Create Logfiles
	log_file_name = _filename_log(output_file, nofpass)
	try:
	log_file_handle = open(log_file_name, 'w')
	except IOError:
	message_fnc("Error creating %s" % log_file_name)
	update_fnc("Error creating logfile")
	return 0
	## Build command for FFMPEG
	command = build_command(nofpass)
	## Start encoding, result will define to continue or not to
	no_error = encode()
	## !!! Status Update
	return no_error

	def propose_resolutions(video_file, display_aspect=None, res_16_9=['1920x1080', '1280x720', '854x480', '640x360'], res_4_3=['640x480'], lq_fallback=True):
	""" Returns a list of possible resolutions that would work with the given
	video, based on its own resultion ans aspect ratio

	@ param display_aspect: Sets the display aspect ratio for videos where
	this might not be detectable
	@param res_16_9: Possible resolutions to select from for 16:9 videos
	@param res_4_3: Possible resolutions to select from for 4:3 videos
	@param lq_fallback: Return the videos own resultion if none of the given fits
	"""
	def eq(a,b):
	if abs(a-b) < 0.01:
	return 1
	else:
	return 0

	def get_smaler_or_equal_res(height, avail_res):
	smaler_res = []
	for res in avail_res:
	vres = int(res.split('x')[1])
	if vres <= height:
	smaler_res.append(res)
	return smaler_res

	def get_res_for_weird_aspect(width, aspect, avail_res):
	smaler_res = []
	for res in avail_res:
	hres, vres = res.split('x')
	hres = int(hres)
	vres = int(vres)
	if hres <= width:
	height = hres * (1.0 / aspect)
	if height % 2 != 0:
	height = height-1
	smaler_res.append(str(hres) + 'x' + str(int(height)))
	return smaler_res

	meta_dict = ffprobe_metadata(video_file)
	for stream in meta_dict['streams']:
	if stream['codec_type'] == 'video':
	width = int(stream['width'])
	height = int(stream['height'])
	# If the display aspect ratio is in the meta, we can even override
	# the ratio that was given to the function as a fallback
	# But the information in the file could be wrong ...
	# Which information is trustful?
	if 'display_aspect_ratio' in stream:
	display_aspect = stream['display_aspect_ratio']
	break
	# Calculate the aspect factors
	if display_aspect == None:
	# Assume square pixels
	display_aspect = float(width) / float(height)
	else:
	asp_w, asp_h = display_aspect.split(':')
	display_aspect = float(asp_w) / float(asp_h)
	# Check if 16:9
	if eq(display_aspect, 1.77):
	possible_res = get_smaler_or_equal_res(height, res_16_9)
	# Check if 4:3
	elif eq(display_aspect, 1.33):
	possible_res = get_smaler_or_equal_res(height, res_4_3)
	# Weird aspect
	else:
	possible_res = get_res_for_weird_aspect(width, display_aspect, res_16_9)
	# If the video is crap
	if not possible_res and lq_fallback:
	return [str(width) + 'x' + str(height)]
	else:
	return possible_res

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