Fixes and testing with files

wavinfo/__init__.py

@@ -0,0 +1 @@
+from .wave_reader import WavInfoReader

wavinfo/wave_ixml_reader.py

@@ -4,38 +4,40 @@ class WavIXMLFormat:
     """
     iXML recorder metadata, as defined by iXML 2.0
     """
-    def __init__(xml):
+    def __init__(self, xml):
         self.source = xml
         self.parsed = ET.fromstring(xml)
 
-    def _get_text_value(xpath):
+    def _get_text_value(self, xpath):
-        root = self.parsed.getroot()
+        print("xpath",xpath)
-        e = root.find("//BWFXML/" + xpath)
+        print("search", "./" + xpath)
-        if e:
+        e = self.parsed.find("./" + xpath)
+        print("result was", e)
+        if e is not None:
             return e.text
     
     @property
     def project(self):
-        return _get_text_value("PROJECT")
+        return self._get_text_value("PROJECT")
         
     @property
     def scene(self):
-        return _get_text_value("SCECE")
+        return self._get_text_value("SCENE")
 
     @property
     def take(self):
-        return _get_text_value("TAKE")
+        return self._get_text_value("TAKE")
 
     @property
     def tape(self):
-        return _get_text_value("TAPE")
+        return self._get_text_value("TAPE")
 
     @property
     def family_uid(self):
-        return _get_text_value("FILE_SET/FAMILY_UID")
+        return self._get_text_value("FILE_SET/FAMILY_UID")
 
     @property
     def family_name(self):
-        return _get_text_value("FILE_SET/FAMILY_NAME")
+        return self._get_text_value("FILE_SET/FAMILY_NAME")
 
 

wavinfo/wave_parser.py

@@ -1,16 +1,19 @@
 
 import struct
 
+
+from .wave_ixml_reader import WavIXMLFormat
+
 from collections import namedtuple
 
 
 ListChunkDescriptor = namedtuple('ListChunk' , 'signature children')
 
 
-class ChunkDescriptor(namedtuple('Chunk', 'ident start length'):
+class ChunkDescriptor(namedtuple('Chunk', 'ident start length') ):
-    def read_data(from_stream):
+    def read_data(self, from_stream):
-        from_stream.seek(start)
+        from_stream.seek(self.start)
-        return from_stream.read(length)
+        return from_stream.read(self.length)
 
 
 def parse_list_chunk(stream, length):
@@ -50,92 +53,9 @@ def parse_chunk(stream):
 WavInfoFormat = namedtuple("WavInfoFormat",'audio_format channel_count sample_rate byte_rate block_align bits_per_sample')
 
 WavBextFormat = namedtuple("WavBextFormat",'description originator originator_ref ' + 
-    'originator_date originator_time time_reference version umid loudness_value ' + 
+    'originator_date originator_time time_reference version umid ' + 
-    'loudness_range max_true_peak max_momentary_loudness max_shortterm_loudness coding_history')
+    'loudness_value loudness_range max_true_peak max_momentary_loudness max_shortterm_loudness ' +
-
+    'coding_history')
-
-
-class WavInfoReader( namedtuple("_WavInfoReaderImpl", "format bext ixml") ):
-    """
-    format : WAV format
-    bext   : The Broadcast-WAV extension as definied by EBU Tech 3285 v2 (2011)
-
-    """
-
-    def __init__(self, path):
-        with open(path, 'rb') as f:
-            chunks = parse_chunk(f)
-            
-            f.seek(0)
-            
-            self.format = _get_format(chunks,f)
-            self.info   = _get_bext(chunks,f)
-            self.ixml   = _get_ixml(chunks,f)
-        
-
-    def _get_format(chunks,f):
-        fmt_chunk = next(chunk for chunk in chunks if chunk.ident == b'fmt ')
-        fmt_data = chunk.read_data(from_stream=f)
-        
-        # The format chunk is
-        # audio_format    U16
-        # channel_count   U16
-        # sample_rate     U32   Note an integer
-        # byte_rate       U32   == SampleRate * NumChannels * BitsPerSample/8
-        # block_align     U16   == NumChannels * BitsPerSample/8
-        # bits_per_sampl  U16
-        unpacked = struct.unpack("<HHIIHH", fmt_data)
-
-        return WavInfoFormat(audio_format = unpacked[0],
-                channel_count = unpacked[1],
-                sample_rate   = unpacked[2],
-                byte_rate     = unpacked[3],
-                block_align   = unpacked[4],
-                bits_per_sample = unpacked[5]
-                )
-
-    def _get_bext(chunks,f):
-
-        fmt_chunk = next(chunk for chunk in chunks if chunk.ident == b'bext')
-        fmt_data = chunk.read_data(from_stream=f)
-
-        # description[256]      
-        # originator[32]
-        # originatorref[32]
-        # originatordate[10]   "YYYY:MM:DD"
-        # originatortime[8]    "HH:MM:SS"
-        # lowtimeref U32
-        # hightimeref U32
-        # version U16
-        # umid[64]
-        # loudnessvalue S16    (in LUFS*100)
-        # loudnessrange S16    (in LUFS*100)
-        # maxtruepeak   S16    (in dbTB*100)
-        # maxmomentaryloudness S16 (LUFS*100)
-        # maxshorttermloudness S16 (LUFS*100)
-        # reserved[180]
-        # codinghistory []
-
-        packstring = "<256s"+ "32s" + "32s" + "10s" + "8s" + "QH" + "64s" + "hhhhh" + "180s"
-        
-        unpacked = struct.unpack(packstring, chunk)
-        rest_starts = struct.calcsize(packstring)
-
-        return WavBextFormat(description=unpacked[0],
-                originator      = unpacked[1],
-                originator_ref  = unpacked[2],
-                originator_date = unpacked[3],
-                originator_time = unpacked[4],
-                time_reference  = unpacked[5],
-                version         = unpacked[6],
-                umid            = unpacked[7],
-                loudness_value  = unpacked[8],
-                loudness_range  = unpacked[9],
-                max_true_peak   = unpacked[10],
-                max_momentary_loudness = unpacked[11],
-                max_shortterm_loudness = unpacked[12],
-                coding_history = fmt_data[rest_starts:]
-                )
 
 
 

wavinfo/wave_reader.py

@@ -0,0 +1,100 @@
+import struct
+
+class WavInfoReader():
+    """
+    format : WAV format
+    bext   : The Broadcast-WAV extension as definied by EBU Tech 3285 v2 (2011)
+
+    """
+
+    def __init__(self, path):
+        with open(path, 'rb') as f:
+            chunks = parse_chunk(f)
+            
+            main_list = chunks.children
+            f.seek(0)
+            
+            self.fmt    = self._get_format(main_list,f)
+            self.info   = self._get_bext(main_list,f)
+            self.ixml   = self._get_ixml(main_list,f)
+
+
+    def _get_format(self,chunks,f):
+        fmt_chunk = next(chunk for chunk in chunks if chunk.ident == b'fmt ')
+        fmt_data = fmt_chunk.read_data(f)
+        
+        # The format chunk is
+        # audio_format    U16
+        # channel_count   U16
+        # sample_rate     U32   Note an integer
+        # byte_rate       U32   == SampleRate * NumChannels * BitsPerSample/8
+        # block_align     U16   == NumChannels * BitsPerSample/8
+        # bits_per_sampl  U16
+        unpacked = struct.unpack("<HHIIHH", fmt_data)
+
+        return WavInfoFormat(audio_format = unpacked[0],
+                channel_count = unpacked[1],
+                sample_rate   = unpacked[2],
+                byte_rate     = unpacked[3],
+                block_align   = unpacked[4],
+                bits_per_sample = unpacked[5]
+                )
+
+    def _get_bext(self,chunks,f):
+
+        bext_chunk = next((chunk for chunk in chunks if chunk.ident == b'bext'),None)
+        bext_data = bext_chunk.read_data(from_stream=f)
+
+        # description[256]      
+        # originator[32]
+        # originatorref[32]
+        # originatordate[10]   "YYYY:MM:DD"
+        # originatortime[8]    "HH:MM:SS"
+        # lowtimeref U32
+        # hightimeref U32
+        # version U16
+        # umid[64]
+        # 
+        # EBU 3285 fields
+        # loudnessvalue S16    (in LUFS*100)
+        # loudnessrange S16    (in LUFS*100)
+        # maxtruepeak   S16    (in dbTB*100)
+        # maxmomentaryloudness S16 (LUFS*100)
+        # maxshorttermloudness S16 (LUFS*100)
+        # reserved[180]
+        # codinghistory []
+        print(len(bext_data))
+        packstring = "<256s"+ "32s" + "32s" + "10s" + "8s" + "QH" + "64s" + "hhhhh" + "180s"
+        
+        rest_starts = struct.calcsize(packstring)
+        unpacked = struct.unpack(packstring, bext_data[:rest_starts])
+        
+
+        return WavBextFormat(description=unpacked[0].decode('ascii').rstrip(' \t\r\n\0'),
+                originator      = unpacked[1].decode('ascii').rstrip(' \t\r\n\0'),
+                originator_ref  = unpacked[2].decode('ascii').rstrip(' \t\r\n\0'),
+                originator_date = unpacked[3].decode('ascii').rstrip(' \t\r\n\0'),
+                originator_time = unpacked[4].decode('ascii').rstrip(' \t\r\n\0'),
+                time_reference  = unpacked[5],
+                version         = unpacked[6],
+                umid            = unpacked[7],
+                loudness_value  = unpacked[8],
+                loudness_range  = unpacked[9],
+                max_true_peak   = unpacked[10],
+                max_momentary_loudness = unpacked[11],
+                max_shortterm_loudness = unpacked[12],
+                coding_history = bext_data[rest_starts:].decode('ascii').rstrip(' \t\r\n\0')
+                )
+
+    def _get_ixml(self,chunks,f):
+
+        ixml_chunk = next((chunk for chunk in chunks if chunk.ident == b'iXML'),None)
+        ixml_data = ixml_chunk.read_data(from_stream=f)
+        ixml_string = ixml_data.decode('utf-8')
+
+        return WavIXMLFormat(ixml_string)
+        
+
+
+        
+