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Debugging with a jupyter notebook

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Jamie Hardt
2018-12-31 16:33:24 -08:00
parent 84f5d0391b
commit 0e21053d4e
4 changed files with 197 additions and 20 deletions
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3
wavinfo/wave_ixml_reader.py
View File

@@ -9,10 +9,7 @@ class WavIXMLFormat:
self.parsed = ET.fromstring(xml)
def _get_text_value(self, xpath):
print("xpath",xpath)
print("search", "./" + xpath)
e = self.parsed.find("./" + xpath)
print("result was", e)
if e is not None:
return e.text

3
wavinfo/wave_parser.py
View File

@@ -1,9 +1,6 @@
import struct
from .wave_ixml_reader import WavIXMLFormat
from collections import namedtuple
ListChunkDescriptor = namedtuple('ListChunk' , 'signature children')

31
wavinfo/wave_reader.py
View File

@@ -2,8 +2,10 @@ import struct
from collections import namedtuple
WavDataDescriptor = namedtuple('WavDataDescriptor','byte_count frame_count')
from .wave_parser import parse_chunk
from .wave_ixml_reader import WavIXMLFormat
WavDataDescriptor = namedtuple('WavDataDescriptor','byte_count frame_count')
WavInfoFormat = namedtuple("WavInfoFormat",'audio_format channel_count sample_rate byte_rate block_align bits_per_sample')
@@ -27,11 +29,11 @@ class WavInfoReader():
self.main_list = chunks.children
f.seek(0)
self.fmt = self._get_format(self.main_list,f)
self.bext = self._get_bext(self.main_list,f)
self.ixml = self._get_ixml(self.main_list,f)
self.fmt = self._get_format(f)
self.bext = self._get_bext(f)
self.ixml = self._get_ixml(f)
self.data = delf._describe_data(self.main_list,f)
self.data = self._describe_data(f)
def _find_chunk_data(self, ident, from_stream, default_none=False):
chunk_descriptor = None
@@ -49,12 +51,13 @@ class WavInfoReader():
def _describe_data(self,f):
data_chunk = next(c for c in self.main_list if c.ident == b'data')
return WavDataDescriptor(byte_count= data_chunk.length, frame_count= data_chunk.length / self.fmt.block_align)
return WavDataDescriptor(byte_count= data_chunk.length,
frame_count= int(data_chunk.length / self.fmt.block_align))
def _get_format(self,chunks,f):
fmt_data = se._find_chunk_data(b'fmt ',f)
def _get_format(self,f):
fmt_data = self._find_chunk_data(b'fmt ',f)
# The format chunk is
# audio_format U16
@@ -63,7 +66,7 @@ class WavInfoReader():
# byte_rate U32 == SampleRate * NumChannels * BitsPerSample/8
# block_align U16 == NumChannels * BitsPerSample/8
# bits_per_sampl U16
packstring = "<HHIIHH",
packstring = "<HHIIHH"
rest_starts = struct.calcsize(packstring)
unpacked = struct.unpack(packstring, fmt_data[:rest_starts])
@@ -82,9 +85,9 @@ class WavInfoReader():
bits_per_sample = unpacked[5]
)
def _get_bext(self,chunks,f):
def _get_bext(self,f):
bext_data = self._find_chunk_data(b'bext',f,default_none=True
bext_data = self._find_chunk_data(b'bext',f,default_none=True)
# description[256]
# originator[32]
@@ -104,7 +107,7 @@ class WavInfoReader():
# maxshorttermloudness S16 (LUFS*100)
# reserved[180]
# codinghistory []
if bext_data == None:
if bext_data is None:
return None
packstring = "<256s"+ "32s" + "32s" + "10s" + "8s" + "QH" + "64s" + "hhhhh" + "180s"
@@ -128,10 +131,10 @@ class WavInfoReader():
coding_history = bext_data[rest_starts:].decode('ascii').rstrip(' \t\r\n\0')
)
def _get_ixml(self,chunks,f):
def _get_ixml(self,f):
ixml_data = self._find_chunk_data(b'iXML',f,default_none=True)
if ixml_data == None:
if ixml_data is None:
return None
ixml_string = ixml_data.decode('utf-8')