'''simple docstring'''

import datetime
import platform
import subprocess
from typing import Optional, Tuple, Union

import numpy as np



def snake_case_      (					__snake_case  :							bytes	,   __snake_case  :							int)			->					np.array:
   lowerCAmelCase_			=      F'''{sampling_rate}'''
   lowerCAmelCase_			=      '''1'''
   lowerCAmelCase_			=      '''f32le'''
   lowerCAmelCase_			=      [
       '''ffmpeg''',
       '''-i''',
       '''pipe:0''',
       '''-ac''',
       ac,
       '''-ar''',
       ar,
       '''-f''',
       format_for_conversion,
       '''-hide_banner''',
       '''-loglevel''',
       '''quiet''',
       '''pipe:1''',
   ]

   try:
      with subprocess.Popen(__snake_case	,   stdin=subprocess.PIPE	,   stdout=subprocess.PIPE) as ffmpeg_process:
         lowerCAmelCase_			=      ffmpeg_process.communicate(__snake_case)
   except FileNotFoundError as error:
      raise ValueError('''ffmpeg was not found but is required to load audio files from filename''') from error
   lowerCAmelCase_			=      output_stream[0]
   lowerCAmelCase_			=      np.frombuffer(__snake_case	,   np.floataa)
   if audio.shape[0] == 0:
      raise ValueError('''Malformed soundfile''')
   return audio



def snake_case_      (					__snake_case  :							int	,   __snake_case  :							float	,   __snake_case  :							str = "f32le"	,   )			->					Union[str, Any]:
   lowerCAmelCase_			=      F'''{sampling_rate}'''
   lowerCAmelCase_			=      '''1'''
   if format_for_conversion == "s16le":
      lowerCAmelCase_			=      2
   elif format_for_conversion == "f32le":
      lowerCAmelCase_			=      4
   else:
      raise ValueError(F'''Unhandled format `{format_for_conversion}`. Please use `s16le` or `f32le`''')

   lowerCAmelCase_			=      platform.system()
   if system == "Linux":
      lowerCAmelCase_			=      '''alsa'''
      lowerCAmelCase_			=      '''default'''
   elif system == "Darwin":
      lowerCAmelCase_			=      '''avfoundation'''
      lowerCAmelCase_			=      ''':0'''
   elif system == "Windows":
      lowerCAmelCase_			=      '''dshow'''
      lowerCAmelCase_			=      '''default'''

   lowerCAmelCase_			=      [
       '''ffmpeg''',
       '''-f''',
       format_,
       '''-i''',
       input_,
       '''-ac''',
       ac,
       '''-ar''',
       ar,
       '''-f''',
       format_for_conversion,
       '''-fflags''',
       '''nobuffer''',
       '''-hide_banner''',
       '''-loglevel''',
       '''quiet''',
       '''pipe:1''',
   ]
   lowerCAmelCase_			=      int(round(sampling_rate * chunk_length_s)) * size_of_sample
   lowerCAmelCase_			=      _ffmpeg_stream(__snake_case	,   __snake_case)
   for item in iterator:
      yield item



def snake_case_      (					__snake_case  :							int	,   __snake_case  :							float	,   __snake_case  :							Optional[int] = None	,   __snake_case  :							Optional[Union[Tuple[float, float], float]] = None	,   __snake_case  :							str = "f32le"	,   )			->					Optional[Any]:
   if stream_chunk_s is not None:
      lowerCAmelCase_			=      stream_chunk_s
   else:
      lowerCAmelCase_			=      chunk_length_s

   lowerCAmelCase_			=      ffmpeg_microphone(__snake_case	,   __snake_case	,   format_for_conversion=__snake_case)
   if format_for_conversion == "s16le":
      lowerCAmelCase_			=      np.intaa
      lowerCAmelCase_			=      2
   elif format_for_conversion == "f32le":
      lowerCAmelCase_			=      np.floataa
      lowerCAmelCase_			=      4
   else:
      raise ValueError(F'''Unhandled format `{format_for_conversion}`. Please use `s16le` or `f32le`''')

   if stride_length_s is None:
      lowerCAmelCase_			=      chunk_length_s / 6
   lowerCAmelCase_			=      int(round(sampling_rate * chunk_length_s)) * size_of_sample
   if isinstance(__snake_case	,   (int, float)):
      lowerCAmelCase_			=      [stride_length_s, stride_length_s]

   lowerCAmelCase_			=      int(round(sampling_rate * stride_length_s[0])) * size_of_sample
   lowerCAmelCase_			=      int(round(sampling_rate * stride_length_s[1])) * size_of_sample
   lowerCAmelCase_			=      datetime.datetime.now()
   lowerCAmelCase_			=      datetime.timedelta(seconds=__snake_case)
   for item in chunk_bytes_iter(__snake_case	,   __snake_case	,   stride=(stride_left, stride_right)	,   stream=__snake_case):
      # Put everything back in numpy scale
      lowerCAmelCase_			=      np.frombuffer(item['''raw''']	,   dtype=__snake_case)
      lowerCAmelCase_			=      (
          item['''stride'''][0] // size_of_sample,
          item['''stride'''][1] // size_of_sample,
      )
      lowerCAmelCase_			=      sampling_rate
      audio_time += delta
      if datetime.datetime.now() > audio_time + 10 * delta:
         # We're late !! SKIP
         continue
      yield item



def snake_case_      (					__snake_case  :							int	,   __snake_case  :							int	,   __snake_case  :							Tuple[int, int]	,   __snake_case  :							bool = False)			->					str:
   lowerCAmelCase_			=      b''''''
   lowerCAmelCase_	,lowerCAmelCase_			=      stride
   if stride_left + stride_right >= chunk_len:
      raise ValueError(
          F'''Stride needs to be strictly smaller than chunk_len: ({stride_left}, {stride_right}) vs {chunk_len}''')
   lowerCAmelCase_			=      0
   for raw in iterator:
      acc += raw
      if stream and len(__snake_case) < chunk_len:
         lowerCAmelCase_			=      (_stride_left, 0)
         yield {"raw": acc[:chunk_len], "stride": stride, "partial": True}
      else:
         while len(__snake_case) >= chunk_len:
            # We are flushing the accumulator
            lowerCAmelCase_			=      (_stride_left, stride_right)
            lowerCAmelCase_			=      {'''raw''': acc[:chunk_len], '''stride''': stride}
            if stream:
               lowerCAmelCase_			=      False
            yield item
            lowerCAmelCase_			=      stride_left
            lowerCAmelCase_			=      acc[chunk_len - stride_left - stride_right :]
    # Last chunk
   if len(__snake_case) > stride_left:
      lowerCAmelCase_			=      {'''raw''': acc, '''stride''': (_stride_left, 0)}
      if stream:
         lowerCAmelCase_			=      False
      yield item






def snake_case_      (					__snake_case  :							str	,   __snake_case  :							int)			->					int:
   lowerCAmelCase_			=      2**24  # 16Mo
   try:
      with subprocess.Popen(__snake_case	,   stdout=subprocess.PIPE	,   bufsize=__snake_case) as ffmpeg_process:
         while True:
            lowerCAmelCase_			=      ffmpeg_process.stdout.read(__snake_case)
            if raw == b"":
               break
            yield raw
   except FileNotFoundError as error:
      raise ValueError('''ffmpeg was not found but is required to stream audio files from filename''') from error






'''simple docstring'''

from __future__ import annotations

from typing import Any



def snake_case_      (					__snake_case  :							list[Any])			->					None:
   create_state_space_tree(__snake_case	,   []	,   0)



def snake_case_      (					__snake_case  :							list[Any]	,   __snake_case  :							list[Any]	,   __snake_case  :							int)			->					None:

   if index == len(__snake_case):
      print(__snake_case)
      return

   create_state_space_tree(__snake_case	,   __snake_case	,   index + 1)
   current_subsequence.append(sequence[index])
   create_state_space_tree(__snake_case	,   __snake_case	,   index + 1)
   current_subsequence.pop()


if __name__ == "__main__":
 A_     :						list[Any]    							=[3, 1, 2, 4]
 generate_all_subsequences(seq)

 seq.clear()
 seq.extend(['''A''', '''B''', '''C'''])
 generate_all_subsequences(seq)





