def basic_reader(filename, last=None, first=0):
"""Common "template" to all read functions."""
hdl = Sndfile(filename, 'r')
try:
if not hdl.format.file_format == filetype:
raise ValueError, "%s is not a %s file (is %s)" \
% (filename, filetype, hdl.format.file_format)
fs = hdl.samplerate
enc = hdl.encoding
# Set the pointer to start position
nf = hdl.seek(first, 1)
if not nf == first:
raise IOError("Error while seeking at starting position")
if last is None:
nframes = hdl.nframes - first
data = hdl.read_frames(nframes)
else:
data = hdl.read_frames(last)
finally:
hdl.close()
return data, fs, enc
def basic_reader(filename, last = None, first = 0):
"""Common "template" to all read functions."""
hdl = Sndfile(filename, 'r')
try:
if not hdl.format.file_format == filetype:
raise ValueError, "%s is not a %s file (is %s)" \
% (filename, filetype, hdl.format.file_format)
fs = hdl.samplerate
enc = hdl.encoding
# Set the pointer to start position
nf = hdl.seek(first, 1)
if not nf == first:
raise IOError("Error while seeking at starting position")
if last is None:
nframes = hdl.nframes - first
data = hdl.read_frames(nframes)
else:
data = hdl.read_frames(last)
finally:
hdl.close()
return data, fs, enc
class sndfile:
"""Main class to open, read and write audio files"""
def __init__(self, filename, mode='read', format=None, channels=0,
samplerate=0):
"""Create an instance of sndfile.
:Parameters:
filename : string or int
name of the file to open (string), or file descriptor (integer)
mode : string
'read' for read, 'write' for write, or 'rwrite' for read and
write.
format : formatinfo
when opening a new file for writing, give the format to write
in.
channels : int
number of channels.
samplerate : int
sampling rate.
:Returns:
sndfile: a valid sndfile object
Notes
-----
format, channels and samplerate need to be given only in the write
modes and for raw files. """
warnings.warn("sndfile class is deprecated, please use Sndfile instead",
DeprecationWarning)
if format is not None and not isinstance(format, formatinfo):
raise ValueError("format argument must be None or " \
"formatinfo instance.")
if format is None:
f = None
else:
f = format._format
self._sndfile = Sndfile(filename, _COMPAT_MODES[mode], f, channels,
samplerate)
# We create a formatinfo instance from a Format info
self._format = formatinfo()
self._format._format = self._sndfile.format
def close(self):
"""close the file."""
self._sndfile.close()
def sync(self):
"""call the operating system's function to force the writing of all
file cache buffers to disk the file.
No effect if file is open as read"""
self._sndfile.sync()
def seek(self, offset, whence=0, mode='rw'):
"""similar to python seek function, taking only in account audio data.
:Parameters:
offset : int
the number of frames (eg two samples for stereo files) to move
relatively to position set by whence.
whence : int
only 0 (beginning), 1 (current) and 2 (end of the file) are
valid.
mode : string
If set to 'rw', both read and write pointers are updated. If
'r' is given, only read pointer is updated, if 'w', only the
write one is (this may of course make sense only if you open
the file in a certain mode).
Notes
-----
- one only takes into accound audio data.
- if an invalid seek is given (beyond or before the file), a
PyaudioIOError is launched."""
try:
st = self._sndfile.seek(offset, whence, mode)
except IOError, e:
raise PyaudioIOError(str(e))
return st
class sndfile:
"""Main class to open, read and write audio files"""
def __init__(self,
filename,
mode='read',
format=None,
channels=0,
samplerate=0):
"""Create an instance of sndfile.
:Parameters:
filename : string or int
name of the file to open (string), or file descriptor (integer)
mode : string
'read' for read, 'write' for write, or 'rwrite' for read and
write.
format : formatinfo
when opening a new file for writing, give the format to write
in.
channels : int
number of channels.
samplerate : int
sampling rate.
:Returns:
sndfile: a valid sndfile object
Notes
-----
format, channels and samplerate need to be given only in the write
modes and for raw files. """
warnings.warn(
"sndfile class is deprecated, please use Sndfile instead",
DeprecationWarning)
if format is not None and not isinstance(format, formatinfo):
raise ValueError("format argument must be None or " \
"formatinfo instance.")
if format is None:
f = None
else:
f = format._format
self._sndfile = Sndfile(filename, _COMPAT_MODES[mode], f, channels,
samplerate)
# We create a formatinfo instance from a Format info
self._format = formatinfo()
self._format._format = self._sndfile.format
def close(self):
"""close the file."""
self._sndfile.close()
def sync(self):
"""call the operating system's function to force the writing of all
file cache buffers to disk the file.
No effect if file is open as read"""
self._sndfile.sync()
def seek(self, offset, whence=0, mode='rw'):
"""similar to python seek function, taking only in account audio data.
:Parameters:
offset : int
the number of frames (eg two samples for stereo files) to move
relatively to position set by whence.
whence : int
only 0 (beginning), 1 (current) and 2 (end of the file) are
valid.
mode : string
If set to 'rw', both read and write pointers are updated. If
'r' is given, only read pointer is updated, if 'w', only the
write one is (this may of course make sense only if you open
the file in a certain mode).
Notes
-----
- one only takes into accound audio data.
- if an invalid seek is given (beyond or before the file), a
PyaudioIOError is launched."""
try:
st = self._sndfile.seek(offset, whence, mode)
except IOError, e:
raise PyaudioIOError(str(e))
return st