本文整理汇总了Python中audiotools.ChannelMask.from_fields方法的典型用法代码示例。如果您正苦于以下问题：Python ChannelMask.from_fields方法的具体用法？Python ChannelMask.from_fields怎么用？Python ChannelMask.from_fields使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类audiotools.ChannelMask的用法示例。
在下文中一共展示了ChannelMask.from_fields方法的6个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: channel_mask
# 需要导入模块: from audiotools import ChannelMask [as 别名]
# 或者: from audiotools.ChannelMask import from_fields [as 别名]
def channel_mask(self):
"""Returns a ChannelMask object of this track's channel layout."""
#this unusual arrangement is taken from the AIFF specification
if (self.channels() <= 2):
return ChannelMask.from_channels(self.channels())
elif (self.channels() == 3):
return ChannelMask.from_fields(
front_left=True, front_right=True, front_center=True)
elif (self.channels() == 4):
return ChannelMask.from_fields(
front_left=True, front_right=True,
back_left=True, back_right=True)
elif (self.channels() == 6):
return ChannelMask.from_fields(
front_left=True, side_left=True,
front_center=True, front_right=True,
side_right=True, back_center=True)
else:
return ChannelMask(0)示例2: channel_mask
# 需要导入模块: from audiotools import ChannelMask [as 别名]
# 或者: from audiotools.ChannelMask import from_fields [as 别名]
def channel_mask(self):
"""Returns a ChannelMask object of this track's channel layout."""
# M4A seems to use the same channel assignment
# as old-style RIFF WAVE/FLAC
if self.channels() == 1:
return ChannelMask.from_fields(front_center=True)
elif self.channels() == 2:
return ChannelMask.from_fields(front_left=True, front_right=True)
elif self.channels() == 3:
return ChannelMask.from_fields(front_left=True, front_right=True, front_center=True)
elif self.channels() == 4:
return ChannelMask.from_fields(front_left=True, front_right=True, back_left=True, back_right=True)
elif self.channels() == 5:
return ChannelMask.from_fields(
front_left=True, front_right=True, front_center=True, back_left=True, back_right=True
)
elif self.channels() == 6:
return ChannelMask.from_fields(
front_left=True,
front_right=True,
front_center=True,
back_left=True,
back_right=True,
low_frequency=True,
)
else:
return ChannelMask(0)示例3: channel_mask
# 需要导入模块: from audiotools import ChannelMask [as 别名]
# 或者: from audiotools.ChannelMask import from_fields [as 别名]
def channel_mask(self):
"""returns a ChannelMask object of this track's channel layout"""
if self.channels() == 1:
return ChannelMask.from_fields(front_center=True)
elif self.channels() == 2:
return ChannelMask.from_fields(front_left=True, front_right=True)
elif self.channels() == 3:
return ChannelMask.from_fields(front_left=True, front_right=True, front_center=True)
elif self.channels() == 4:
return ChannelMask.from_fields(front_left=True, front_right=True, back_left=True, back_right=True)
elif self.channels() == 5:
return ChannelMask.from_fields(
front_left=True, front_right=True, front_center=True, back_left=True, back_right=True
)
elif self.channels() == 6:
return ChannelMask.from_fields(
front_left=True,
front_right=True,
front_center=True,
back_left=True,
back_right=True,
low_frequency=True,
)
elif self.channels() == 7:
return ChannelMask.from_fields(
front_left=True,
front_right=True,
front_center=True,
side_left=True,
side_right=True,
back_center=True,
low_frequency=True,
)
elif self.channels() == 8:
return ChannelMask.from_fields(
front_left=True,
front_right=True,
side_left=True,
side_right=True,
back_left=True,
back_right=True,
front_center=True,
low_frequency=True,
)
else:
return ChannelMask(0)示例4: channel_mask
# 需要导入模块: from audiotools import ChannelMask [as 别名]
# 或者: from audiotools.ChannelMask import from_fields [as 别名]
def channel_mask(self):
"""Returns a ChannelMask object of this track's channel layout."""
if (self.channels() == 1):
return ChannelMask.from_fields(
front_center=True)
elif (self.channels() == 2):
return ChannelMask.from_fields(
front_left=True, front_right=True)
elif (self.channels() == 3):
return ChannelMask.from_fields(
front_left=True, front_right=True,
front_center=True)
elif (self.channels() == 4):
return ChannelMask.from_fields(
front_left=True, front_right=True,
back_left=True, back_right=True)
elif (self.channels() == 5):
return ChannelMask.from_fields(
front_left=True, front_right=True,
front_center=True,
back_left=True, back_right=True)
elif (self.channels() == 6):
return ChannelMask.from_fields(
front_left=True, front_right=True,
front_center=True,
back_left=True, back_right=True,
low_frequency=True)
elif (self.channels() == 7):
return ChannelMask.from_fields(
front_left=True, front_right=True,
front_center=True,
side_left=True, side_right=True,
back_center=True, low_frequency=True)
elif (self.channels() == 8):
return ChannelMask.from_fields(
front_left=True, front_right=True,
side_left=True, side_right=True,
back_left=True, back_right=True,
front_center=True, low_frequency=True)
else:
return ChannelMask(0)示例5: __read_info__
# 需要导入模块: from audiotools import ChannelMask [as 别名]
# 或者: from audiotools.ChannelMask import from_fields [as 别名]
def __read_info__(self):
from audiotools.bitstream import BitstreamReader
from audiotools import ChannelMask
reader = BitstreamReader(open(self.filename, "rb"), 1)
reader.mark()
try:
(block_id,
total_samples,
bits_per_sample,
mono_output,
initial_block,
final_block,
sample_rate) = reader.parse(
"4b 64p 32u 64p 2u 1u 8p 1u 1u 5p 5p 4u 37p")
if (block_id != 'wvpk'):
from audiotools.text import ERR_WAVPACK_INVALID_HEADER
raise InvalidWavPack(ERR_WAVPACK_INVALID_HEADER)
if (sample_rate != 0xF):
self.__samplerate__ = WavPackAudio.SAMPLING_RATE[sample_rate]
else:
# if unknown, pull from SAMPLE_RATE sub-block
for (block_id,
nondecoder,
data_size,
data) in self.sub_blocks(reader):
if ((block_id == 0x7) and nondecoder):
self.__samplerate__ = data.read(data_size * 8)
break
else:
# no SAMPLE RATE sub-block found
# so pull info from FMT chunk
reader.rewind()
(self.__samplerate__,) = self.fmt_chunk(reader).parse(
"32p 32u")
self.__bitspersample__ = [8, 16, 24, 32][bits_per_sample]
self.__total_frames__ = total_samples
if (initial_block and final_block):
if (mono_output):
self.__channels__ = 1
self.__channel_mask__ = ChannelMask(0x4)
else:
self.__channels__ = 2
self.__channel_mask__ = ChannelMask(0x3)
else:
# if not mono or stereo, pull from CHANNEL INFO sub-block
reader.rewind()
for (block_id,
nondecoder,
data_size,
data) in self.sub_blocks(reader):
if ((block_id == 0xD) and not nondecoder):
self.__channels__ = data.read(8)
self.__channel_mask__ = ChannelMask(
data.read((data_size - 1) * 8))
break
else:
# no CHANNEL INFO sub-block found
# so pull info from FMT chunk
reader.rewind()
fmt = self.fmt_chunk(reader)
compression_code = fmt.read(16)
self.__channels__ = fmt.read(16)
if (compression_code == 1):
# this is theoretically possible
# with very old .wav files,
# but shouldn't happen in practice
self.__channel_mask__ = \
{1: ChannelMask.from_fields(front_center=True),
2: ChannelMask.from_fields(front_left=True,
front_right=True),
3: ChannelMask.from_fields(front_left=True,
front_right=True,
front_center=True),
4: ChannelMask.from_fields(front_left=True,
front_right=True,
back_left=True,
back_right=True),
5: ChannelMask.from_fields(front_left=True,
front_right=True,
back_left=True,
back_right=True,
front_center=True),
6: ChannelMask.from_fields(front_left=True,
front_right=True,
back_left=True,
back_right=True,
front_center=True,
low_frequency=True)
}.get(self.__channels__, ChannelMask(0))
elif (compression_code == 0xFFFE):
fmt.skip(128)
mask = fmt.read(32)
self.__channel_mask__ = ChannelMask(mask)
else:
from audiotools.text import ERR_WAVPACK_UNSUPPORTED_FMT
#.........这里部分代码省略.........
示例6: parse_fmt
# 需要导入模块: from audiotools import ChannelMask [as 别名]
# 或者: from audiotools.ChannelMask import from_fields [as 别名]
def parse_fmt(fmt):
"""given a fmt block BitstreamReader (without the 8 byte header)
returns (channels, sample_rate, bits_per_sample, channel_mask)
where channel_mask is a ChannelMask object and the rest are ints
may raise ValueError if the fmt chunk is invalid
or IOError if an error occurs parsing the chunk"""
from audiotools import ChannelMask
(compression,
channels,
sample_rate,
bytes_per_second,
block_align,
bits_per_sample) = fmt.parse("16u 16u 32u 32u 16u 16u")
if compression == 1:
# if we have a multi-channel WAVE file
# that's not WAVEFORMATEXTENSIBLE,
# assume the channels follow
# SMPTE/ITU-R recommendations
# and hope for the best
if channels == 1:
channel_mask = ChannelMask.from_fields(
front_center=True)
elif channels == 2:
channel_mask = ChannelMask.from_fields(
front_left=True, front_right=True)
elif channels == 3:
channel_mask = ChannelMask.from_fields(
front_left=True, front_right=True,
front_center=True)
elif channels == 4:
channel_mask = ChannelMask.from_fields(
front_left=True, front_right=True,
back_left=True, back_right=True)
elif channels == 5:
channel_mask = ChannelMask.from_fields(
front_left=True, front_right=True,
back_left=True, back_right=True,
front_center=True)
elif channels == 6:
channel_mask = ChannelMask.from_fields(
front_left=True, front_right=True,
back_left=True, back_right=True,
front_center=True, low_frequency=True)
else:
channel_mask = ChannelMask(0)
return (channels, sample_rate, bits_per_sample, channel_mask)
elif compression == 0xFFFE:
(cb_size,
valid_bits_per_sample,
channel_mask,
sub_format) = fmt.parse("16u 16u 32u 16b")
if (sub_format !=
(b'\x01\x00\x00\x00\x00\x00\x10\x00' +
b'\x80\x00\x00\xaa\x00\x38\x9b\x71')):
# FIXME
raise ValueError("invalid WAVE sub-format")
else:
channel_mask = ChannelMask(channel_mask)
return (channels, sample_rate, bits_per_sample, channel_mask)
else:
# FIXME
raise ValueError("unsupported WAVE compression")