def get_ixml(self):
"""Collects an iXML chunk string if the chunk is available.
Attempt to get an iterator for an iXML chunk. If the generated chunk length
is set, attempt to read the iXML chunk data and convert the chunk info pointer to a string.
"""
# set the chunk info struct
chunk_info = _ffi.new("SF_CHUNK_INFO*")
# set the chunk id to obtain
chunk_info.id = b'iXML'
chunk_info.id_size = 4;
# get the chunk iterator
iterator = _snd.sf_get_chunk_iterator(self._file, chunk_info)
# get the chunk size to generate the data length
err = _snd.sf_get_chunk_size(iterator, chunk_info)
# if the chunk has data read it to a string
if (chunk_info.datalen > 0):
# allocate memory to the chunk data
chunk_data = _ffi.new("char[]", 1024)
chunk_info.data = chunk_data
_snd.sf_get_chunk_data(iterator, chunk_info)
#convert the chunk data pointer to a string
self.ixml_info = _ffi.buffer(chunk_info.data, chunk_info.datalen)[:].decode()
def get_ixml(self):
"""Collects an iXML chunk string if the chunk is available.
Attempt to get an iterator for an iXML chunk. If the generated chunk length
is set, attempt to read the iXML chunk data and convert the chunk info pointer to a string.
"""
# set the chunk info struct
chunk_info = _ffi.new("SF_CHUNK_INFO*")
# set the chunk id to obtain
chunk_info.id = b'iXML'
chunk_info.id_size = 4
# get the chunk iterator
iterator = _snd.sf_get_chunk_iterator(self._file, chunk_info)
# get the chunk size to generate the data length
err = _snd.sf_get_chunk_size(iterator, chunk_info)
# if the chunk has data read it to a string
if (chunk_info.datalen > 0):
# allocate memory to the chunk data
chunk_data = _ffi.new("char[]", 1024)
chunk_info.data = chunk_data
_snd.sf_get_chunk_data(iterator, chunk_info)
#convert the chunk data pointer to a string
self.ixml_info = _ffi.buffer(chunk_info.data,
chunk_info.datalen)[:].decode()
def get_bext(self):
"""Retrieve the broadcast wave bext chunk metadata from a libsndfile command and return the converted data to a dict."""
info = _ffi.new("SF_BROADCAST_INFO*")
_snd.sf_command(self._file, _snd.SFC_GET_BROADCAST_INFO, info, 1024)
#return the broadcast wave metadata to a dict after formatting ffi bytes to strings, formatted seconds from midnight to time string
self.bext_info = {
"description":
self.ffi_string(info.description),
"originator":
self.ffi_string(info.originator),
"originator_reference":
self.ffi_string(info.originator_reference),
"origination_date":
self.ffi_string(info.origination_date),
"origination_time":
self.ffi_string(info.origination_time),
"timereference_translated":
samples_to_time(info.time_reference_low, self.samplerate),
"timereference":
info.time_reference_low,
"version":
info.version,
"umid":
self.ffi_string(info.umid),
"coding_history":
self.ffi_string(info.coding_history)
}
def get_bext(self):
"""Retrieve the broadcast wave bext chunk metadata from a libsndfile command and return the converted data to a dict."""
info = _ffi.new("SF_BROADCAST_INFO*")
_snd.sf_command(self._file, _snd.SFC_GET_BROADCAST_INFO,
info, 1024)
#return the broadcast wave metadata to a dict after formatting ffi bytes to strings, formatted seconds from midnight to time string
self.bext_info = {
"description": self.ffi_string(info.description),
"originator": self.ffi_string(info.originator),
"originator_reference": self.ffi_string(info.originator_reference),
"origination_date": self.ffi_string(info.origination_date),
"origination_time": self.ffi_string(info.origination_time),
"timereference_translated": samples_to_time(info.time_reference_low, self.samplerate),
"timereference": info.time_reference_low,
"version": info.version,
"umid": self.ffi_string(info.umid),
"coding_history": self.ffi_string(info.coding_history)
}
