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from __future__ import division
import json
import os
import re
import sys
from subprocess import Popen, PIPE
from math import log, ceil
from tempfile import TemporaryFile
from warnings import warn
from functools import wraps
try:
import audioop
except ImportError:
import pyaudioop as audioop
if sys.version_info >= (3, 0):
basestring = str
FRAME_WIDTHS = {
8: 1,
16: 2,
32: 4,
}
ARRAY_TYPES = {
8: "b",
16: "h",
32: "i",
}
ARRAY_RANGES = {
8: (-0x80, 0x7f),
16: (-0x8000, 0x7fff),
32: (-0x80000000, 0x7fffffff),
}
def get_frame_width(bit_depth):
return FRAME_WIDTHS[bit_depth]
def get_array_type(bit_depth, signed=True):
t = ARRAY_TYPES[bit_depth]
if not signed:
t = t.upper()
return t
def get_min_max_value(bit_depth):
return ARRAY_RANGES[bit_depth]
def _fd_or_path_or_tempfile(fd, mode='w+b', tempfile=True):
close_fd = False
if fd is None and tempfile:
fd = TemporaryFile(mode=mode)
close_fd = True
if isinstance(fd, basestring):
fd = open(fd, mode=mode)
close_fd = True
try:
if isinstance(fd, os.PathLike):
fd = open(fd, mode=mode)
close_fd = True
except AttributeError:
# module os has no attribute PathLike, so we're on python < 3.6.
# The protocol we're trying to support doesn't exist, so just pass.
pass
return fd, close_fd
def db_to_float(db, using_amplitude=True):
"""
Converts the input db to a float, which represents the equivalent
ratio in power.
"""
db = float(db)
if using_amplitude:
return 10 ** (db / 20)
else: # using power
return 10 ** (db / 10)
def ratio_to_db(ratio, val2=None, using_amplitude=True):
"""
Converts the input float to db, which represents the equivalent
to the ratio in power represented by the multiplier passed in.
"""
ratio = float(ratio)
# accept 2 values and use the ratio of val1 to val2
if val2 is not None:
ratio = ratio / val2
# special case for multiply-by-zero (convert to silence)
if ratio == 0:
return -float('inf')
if using_amplitude:
return 20 * log(ratio, 10)
else: # using power
return 10 * log(ratio, 10)
def register_pydub_effect(fn, name=None):
"""
decorator for adding pydub effects to the AudioSegment objects.
example use:
@register_pydub_effect
def normalize(audio_segment):
...
or you can specify a name:
@register_pydub_effect("normalize")
def normalize_audio_segment(audio_segment):
...
"""
if isinstance(fn, basestring):
name = fn
return lambda fn: register_pydub_effect(fn, name)
if name is None:
name = fn.__name__
from .audio_segment import AudioSegment
setattr(AudioSegment, name, fn)
return fn
def make_chunks(audio_segment, chunk_length):
"""
Breaks an AudioSegment into chunks that are <chunk_length> milliseconds
long.
if chunk_length is 50 then you'll get a list of 50 millisecond long audio
segments back (except the last one, which can be shorter)
"""
number_of_chunks = ceil(len(audio_segment) / float(chunk_length))
return [audio_segment[i * chunk_length:(i + 1) * chunk_length]
for i in range(int(number_of_chunks))]
def which(program):
"""
Mimics behavior of UNIX which command.
"""
# Add .exe program extension for windows support
if os.name == "nt" and not program.endswith(".exe"):
program += ".exe"
envdir_list = [os.curdir] + os.environ["PATH"].split(os.pathsep)
for envdir in envdir_list:
program_path = os.path.join(envdir, program)
if os.path.isfile(program_path) and os.access(program_path, os.X_OK):
return program_path
def get_encoder_name():
"""
Return enconder default application for system, either avconv or ffmpeg
"""
if which("avconv"):
return "avconv"
elif which("ffmpeg"):
return "ffmpeg"
else:
# should raise exception
warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)
return "ffmpeg"
def get_player_name():
"""
Return enconder default application for system, either avconv or ffmpeg
"""
if which("avplay"):
return "avplay"
elif which("ffplay"):
return "ffplay"
else:
# should raise exception
warn("Couldn't find ffplay or avplay - defaulting to ffplay, but may not work", RuntimeWarning)
return "ffplay"
def get_prober_name():
"""
Return probe application, either avconv or ffmpeg
"""
if which("avprobe"):
return "avprobe"
elif which("ffprobe"):
return "ffprobe"
else:
# should raise exception
warn("Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work", RuntimeWarning)
return "ffprobe"
def fsdecode(filename):
"""Wrapper for os.fsdecode which was introduced in python 3.2 ."""
if sys.version_info >= (3, 2):
PathLikeTypes = (basestring, bytes)
if sys.version_info >= (3, 6):
PathLikeTypes += (os.PathLike,)
if isinstance(filename, PathLikeTypes):
return os.fsdecode(filename)
else:
if isinstance(filename, bytes):
return filename.decode(sys.getfilesystemencoding())
if isinstance(filename, basestring):
return filename
raise TypeError("type {0} not accepted by fsdecode".format(type(filename)))
def get_extra_info(stderr):
"""
avprobe sometimes gives more information on stderr than
on the json output. The information has to be extracted
from stderr of the format of:
' Stream #0:0: Audio: flac, 88200 Hz, stereo, s32 (24 bit)'
or (macOS version):
' Stream #0:0: Audio: vorbis'
' 44100 Hz, stereo, fltp, 320 kb/s'
:type stderr: str
:rtype: list of dict
"""
extra_info = {}
re_stream = r'(?P<space_start> +)Stream #0[:\.](?P<stream_id>([0-9]+))(?P<content_0>.+)\n?((?P<space_end> +)(?P<content_1>.+))?'
for i in re.finditer(re_stream, stderr):
if i.group('space_end') is not None and len(i.group('space_start')) <= len(
i.group('space_end')):
content_line = ','.join([i.group('content_0'), i.group('content_1')])
else:
content_line = i.group('content_0')
tokens = [x.strip() for x in re.split('[:,]', content_line) if x]
extra_info[int(i.group('stream_id'))] = tokens
return extra_info
def mediainfo_json(filepath, read_ahead_limit=-1):
"""Return json dictionary with media info(codec, duration, size, bitrate...) from filepath
"""
prober = get_prober_name()
command_args = [
"-v", "info",
"-show_format",
"-show_streams",
]
try:
command_args += [fsdecode(filepath)]
stdin_parameter = None
stdin_data = None
except TypeError:
if prober == 'ffprobe':
command_args += ["-read_ahead_limit", str(read_ahead_limit),
"cache:pipe:0"]
else:
command_args += ["-"]
stdin_parameter = PIPE
file, close_file = _fd_or_path_or_tempfile(filepath, 'rb', tempfile=False)
file.seek(0)
stdin_data = file.read()
if close_file:
file.close()
command = [prober, '-of', 'json'] + command_args
res = Popen(command, stdin=stdin_parameter, stdout=PIPE, stderr=PIPE)
output, stderr = res.communicate(input=stdin_data)
output = output.decode("utf-8", 'ignore')
stderr = stderr.decode("utf-8", 'ignore')
info = json.loads(output)
if not info:
# If ffprobe didn't give any information, just return it
# (for example, because the file doesn't exist)
return info
extra_info = get_extra_info(stderr)
audio_streams = [x for x in info['streams'] if x['codec_type'] == 'audio']
if len(audio_streams) == 0:
return info
# We just operate on the first audio stream in case there are more
stream = audio_streams[0]
def set_property(stream, prop, value):
if prop not in stream or stream[prop] == 0:
stream[prop] = value
for token in extra_info[stream['index']]:
m = re.match('([su]([0-9]{1,2})p?) \(([0-9]{1,2}) bit\)$', token)
m2 = re.match('([su]([0-9]{1,2})p?)( \(default\))?$', token)
if m:
set_property(stream, 'sample_fmt', m.group(1))
set_property(stream, 'bits_per_sample', int(m.group(2)))
set_property(stream, 'bits_per_raw_sample', int(m.group(3)))
elif m2:
set_property(stream, 'sample_fmt', m2.group(1))
set_property(stream, 'bits_per_sample', int(m2.group(2)))
set_property(stream, 'bits_per_raw_sample', int(m2.group(2)))
elif re.match('(flt)p?( \(default\))?$', token):
set_property(stream, 'sample_fmt', token)
set_property(stream, 'bits_per_sample', 32)
set_property(stream, 'bits_per_raw_sample', 32)
elif re.match('(dbl)p?( \(default\))?$', token):
set_property(stream, 'sample_fmt', token)
set_property(stream, 'bits_per_sample', 64)
set_property(stream, 'bits_per_raw_sample', 64)
return info
def mediainfo(filepath):
"""Return dictionary with media info(codec, duration, size, bitrate...) from filepath
"""
prober = get_prober_name()
command_args = [
"-v", "quiet",
"-show_format",
"-show_streams",
filepath
]
command = [prober, '-of', 'old'] + command_args
res = Popen(command, stdout=PIPE)
output = res.communicate()[0].decode("utf-8")
if res.returncode != 0:
command = [prober] + command_args
output = Popen(command, stdout=PIPE).communicate()[0].decode("utf-8")
rgx = re.compile(r"(?:(?P<inner_dict>.*?):)?(?P<key>.*?)\=(?P<value>.*?)$")
info = {}
if sys.platform == 'win32':
output = output.replace("\r", "")
for line in output.split("\n"):
# print(line)
mobj = rgx.match(line)
if mobj:
# print(mobj.groups())
inner_dict, key, value = mobj.groups()
if inner_dict:
try:
info[inner_dict]
except KeyError:
info[inner_dict] = {}
info[inner_dict][key] = value
else:
info[key] = value
return info
def cache_codecs(function):
cache = {}
@wraps(function)
def wrapper():
try:
return cache[0]
except:
cache[0] = function()
return cache[0]
return wrapper
@cache_codecs
def get_supported_codecs():
encoder = get_encoder_name()
command = [encoder, "-codecs"]
res = Popen(command, stdout=PIPE, stderr=PIPE)
output = res.communicate()[0].decode("utf-8")
if res.returncode != 0:
return []
if sys.platform == 'win32':
output = output.replace("\r", "")
rgx = re.compile(r"^([D.][E.][AVS.][I.][L.][S.]) (\w*) +(.*)")
decoders = set()
encoders = set()
for line in output.split('\n'):
match = rgx.match(line.strip())
if not match:
continue
flags, codec, name = match.groups()
if flags[0] == 'D':
decoders.add(codec)
if flags[1] == 'E':
encoders.add(codec)
return (decoders, encoders)
def get_supported_decoders():
return get_supported_codecs()[0]
def get_supported_encoders():
return get_supported_codecs()[1]
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