def __init__(self, source):
'''Construct a `StaticSource` for the data in `source`.
:Parameters:
`source` : `Source`
The source to read and decode audio and video data from.
'''
source = source._get_queue_source()
if source.video_format:
raise NotImplementedError(
'Static sources not supported for video yet.')
self.audio_format = source.audio_format
if not self.audio_format:
return
# Arbitrary: number of bytes to request at a time.
buffer_size = 1 << 20 # 1 MB
# Naive implementation. Driver-specific implementations may override
# to load static audio data into device (or at least driver) memory.
data = BytesIO()
while True:
audio_data = source.get_audio_data(buffer_size)
if not audio_data:
break
data.write(audio_data.get_string_data())
self._data = data.getvalue()
self._duration = len(self._data) / \
float(self.audio_format.bytes_per_second)
def __init__(self, data, audio_format):
'''Construct a memory source over the given data buffer.
'''
self._file = BytesIO(data)
self._max_offset = len(data)
self.audio_format = audio_format
self._duration = len(data) / float(audio_format.bytes_per_second)
def __init__(self, source):
'''Construct a `StaticSource` for the data in `source`.
:Parameters:
`source` : `Source`
The source to read and decode audio and video data from.
'''
source = source._get_queue_source()
if source.video_format:
raise NotImplementedError(
'Static sources not supported for video yet.')
self.audio_format = source.audio_format
if not self.audio_format:
return
# Arbitrary: number of bytes to request at a time.
buffer_size = 1 << 20 # 1 MB
# Naive implementation. Driver-specific implementations may override
# to load static audio data into device (or at least driver) memory.
data = BytesIO()
while True:
audio_data = source.get_audio_data(buffer_size)
if not audio_data:
break
data.write(audio_data.get_string_data())
self._data = data.getvalue()
self._duration = len(self._data) / \
float(self.audio_format.bytes_per_second)
def __init__(self, data, audio_format):
'''Construct a memory source over the given data buffer.
'''
self._file = BytesIO(data)
self._max_offset = len(data)
self.audio_format = audio_format
self._duration = len(data) / float(audio_format.bytes_per_second)
class StaticMemorySource(StaticSource):
'''Helper class for default implementation of `StaticSource`. Do not use
directly.'''
def __init__(self, data, audio_format):
'''Construct a memory source over the given data buffer.
'''
self._file = BytesIO(data)
self._max_offset = len(data)
self.audio_format = audio_format
self._duration = len(data) / float(audio_format.bytes_per_second)
def seek(self, timestamp):
offset = int(timestamp * self.audio_format.bytes_per_second)
# Align to sample
if self.audio_format.bytes_per_sample == 2:
offset &= 0xfffffffe
elif self.audio_format.bytes_per_sample == 4:
offset &= 0xfffffffc
self._file.seek(offset)
def get_audio_data(self, bytes):
offset = self._file.tell()
timestamp = float(offset) / self.audio_format.bytes_per_second
# Align to sample size
if self.audio_format.bytes_per_sample == 2:
bytes &= 0xfffffffe
elif self.audio_format.bytes_per_sample == 4:
bytes &= 0xfffffffc
data = self._file.read(bytes)
if not len(data):
return None
duration = float(len(data)) / self.audio_format.bytes_per_second
return AudioData(data, len(data), timestamp, duration, [])
class StaticMemorySource(StaticSource):
'''Helper class for default implementation of `StaticSource`. Do not use
directly.'''
def __init__(self, data, audio_format):
'''Construct a memory source over the given data buffer.
'''
self._file = BytesIO(data)
self._max_offset = len(data)
self.audio_format = audio_format
self._duration = len(data) / float(audio_format.bytes_per_second)
def seek(self, timestamp):
offset = int(timestamp * self.audio_format.bytes_per_second)
# Align to sample
if self.audio_format.bytes_per_sample == 2:
offset &= 0xfffffffe
elif self.audio_format.bytes_per_sample == 4:
offset &= 0xfffffffc
self._file.seek(offset)
def get_audio_data(self, bytes):
offset = self._file.tell()
timestamp = float(offset) / self.audio_format.bytes_per_second
# Align to sample size
if self.audio_format.bytes_per_sample == 2:
bytes &= 0xfffffffe
elif self.audio_format.bytes_per_sample == 4:
bytes &= 0xfffffffc
data = self._file.read(bytes)
if not len(data):
return None
duration = float(len(data)) / self.audio_format.bytes_per_second
return AudioData(data, len(data), timestamp, duration, [])
def __init__(self, file):
if not hasattr(file, 'seek'):
file = BytesIO(file.read())
super(RIFFFile, self).__init__(file, 0)
def __init__(self, file):
if not hasattr(file, 'seek'):
file = BytesIO(file.read())
super(RIFFFile, self).__init__(file, 0)
