Tests

README.md

@@ -4,6 +4,7 @@
 
 # wavinfo
 
+
 The `wavinfo` package allows you to probe WAVE files and extract extended metadata, with an emphasis on 
 production metadata. 
 
@@ -23,4 +24,93 @@ This module is presently under construction and not sutiable for production at t
 
 [ebu]:https://tech.ebu.ch/docs/tech/tech3285.pdf
 [smpte_330m2011]:http://standards.smpte.org/content/978-1-61482-678-1/st-330-2011/SEC1.abstract
-[ixml]:http://www.ixml.info
+[ixml]:http://www.ixml.infoi
+
+
+
+## Demonstration
+
+
+The entry point for wavinfo is the WavInfoReader class.
+
+
+```python
+from wavinfo import WavInfoReader
+
+path = '../tests/test_files/A101_1.WAV'
+
+info = WavInfoReader(path)
+```
+
+### Basic WAV Data
+
+
+The length of the file in frames (interleaved samples) and bytes is available, as is the contents of the format chunk.
+
+
+```python
+(info.data.frame_count, info.data.byte_count)
+>>> (240239, 1441434)
+(info.fmt.sample_rate, info.fmt.channel_count, info.fmt.block_align, info.fmt.bits_per_sample)
+>>> (48000, 2, 6, 24)
+```
+
+## Broadcast WAV Extension
+
+
+
+```python
+print(info.bext.description)
+print("----------")
+print("Originator:", info.bext.originator)
+print("Originator Ref:", info.bext.originator_ref)
+print("Originator Date:", info.bext.originator_date)
+print("Originator Time:", info.bext.originator_time)
+print("Time Reference:", info.bext.time_reference)
+print(info.bext.coding_history)
+```
+
+    sSPEED=023.976-ND
+    sTAKE=1
+    sUBITS=$12311801
+    sSWVER=2.67
+    sPROJECT=BMH
+    sSCENE=A101
+    sFILENAME=A101_1.WAV
+    sTAPE=18Y12M31
+    sTRK1=MKH516 A
+    sTRK2=Boom
+    sNOTE=
+    
+    ----------
+    Originator: Sound Dev: 702T S#GR1112089007
+    Originator Ref: USSDVGR1112089007124001008206301
+    Originator Date: 2018-12-31
+    Originator Time: 12:40:00
+    Time Reference: 2190940753
+    A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch
+
+
+
+## iXML Production Recorder Metadata
+
+
+```python
+print("iXML Project:", info.ixml.project)
+print("iXML Scene:", info.ixml.scene)
+print("iXML Take:", info.ixml.take)
+print("iXML Tape:", info.ixml.tape)
+print("iXML File Family Name:", info.ixml.family_name)
+print("iXML File Family UID:", info.ixml.family_uid)
+```
+
+    iXML Project: BMH
+    iXML Scene: A101
+    iXML Take: 1
+    iXML Tape: 18Y12M31
+    iXML File Family Name: None
+    iXML File Family UID: USSDVGR1112089007124001008206300
+    A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch
+    
+
+

demo.md

@@ -0,0 +1,104 @@
+
+# `wavinfo` Demonstration
+
+The entry point for wavinfo is the WavInfoReader class.
+
+
+```python
+from wavinfo import WavInfoReader
+
+path = '../tests/test_files/A101_1.WAV'
+
+info = WavInfoReader(path)
+```
+
+## Basic WAV Data
+
+The length of the file in frames (interleaved samples) and bytes is available, as is the contents of the format chunk.
+
+
+```python
+(info.data.frame_count, info.data.byte_count)
+```
+
+
+
+
+    (240239, 1441434)
+
+
+
+
+```python
+(info.fmt.sample_rate, info.fmt.channel_count, info.fmt.block_align, info.fmt.bits_per_sample)
+```
+
+
+
+
+    (48000, 2, 6, 24)
+
+
+
+## Broadcast WAV Extension
+
+
+```python
+print(info.bext.description)
+print("----------")
+print("Originator:", info.bext.originator)
+print("Originator Ref:", info.bext.originator_ref)
+print("Originator Date:", info.bext.originator_date)
+print("Originator Time:", info.bext.originator_time)
+print("Time Reference:", info.bext.time_reference)
+print(info.bext.coding_history)
+```
+
+    sSPEED=023.976-ND
+    sTAKE=1
+    sUBITS=$12311801
+    sSWVER=2.67
+    sPROJECT=BMH
+    sSCENE=A101
+    sFILENAME=A101_1.WAV
+    sTAPE=18Y12M31
+    sTRK1=MKH516 A
+    sTRK2=Boom
+    sNOTE=
+    
+    ----------
+    Originator: Sound Dev: 702T S#GR1112089007
+    Originator Ref: USSDVGR1112089007124001008206301
+    Originator Date: 2018-12-31
+    Originator Time: 12:40:00
+    Time Reference: 2190940753
+    A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch
+    
+
+
+## iXML Production Recorder Metadata
+
+
+```python
+print("iXML Project:", info.ixml.project)
+print("iXML Scene:", info.ixml.scene)
+print("iXML Take:", info.ixml.take)
+print("iXML Tape:", info.ixml.tape)
+print("iXML File Family Name:", info.ixml.family_name)
+print("iXML File Family UID:", info.ixml.family_uid)
+```
+
+    iXML Project: BMH
+    iXML Scene: A101
+    iXML Take: 1
+    iXML Tape: 18Y12M31
+    iXML File Family Name: None
+    iXML File Family UID: USSDVGR1112089007124001008206300
+    A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch
+    
+
+
+
+```python
+
+```

examples/demo.ipynb

@@ -0,0 +1,189 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# `wavinfo` Demonstration\n",
+    "\n",
+    "The entry point for wavinfo is the WavInfoReader class."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from wavinfo import WavInfoReader\n",
+    "\n",
+    "path = '../tests/test_files/A101_1.WAV'\n",
+    "\n",
+    "info = WavInfoReader(path)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Basic WAV Data\n",
+    "\n",
+    "The length of the file in frames (interleaved samples) and bytes is available, as is the contents of the format chunk."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "(240239, 1441434)"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "(info.data.frame_count, info.data.byte_count)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "(48000, 2, 6, 24)"
+      ]
+     },
+     "execution_count": 7,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "(info.fmt.sample_rate, info.fmt.channel_count, info.fmt.block_align, info.fmt.bits_per_sample)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Broadcast WAV Extension"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "sSPEED=023.976-ND\r\n",
+      "sTAKE=1\r\n",
+      "sUBITS=$12311801\r\n",
+      "sSWVER=2.67\r\n",
+      "sPROJECT=BMH\r\n",
+      "sSCENE=A101\r\n",
+      "sFILENAME=A101_1.WAV\r\n",
+      "sTAPE=18Y12M31\r\n",
+      "sTRK1=MKH516 A\r\n",
+      "sTRK2=Boom\r\n",
+      "sNOTE=\r\n",
+      "\n",
+      "----------\n",
+      "Originator: Sound Dev: 702T S#GR1112089007\n",
+      "Originator Ref: USSDVGR1112089007124001008206301\n",
+      "Originator Date: 2018-12-31\n",
+      "Originator Time: 12:40:00\n",
+      "Time Reference: 2190940753\n",
+      "A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch\r\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(info.bext.description)\n",
+    "print(\"----------\")\n",
+    "print(\"Originator:\", info.bext.originator)\n",
+    "print(\"Originator Ref:\", info.bext.originator_ref)\n",
+    "print(\"Originator Date:\", info.bext.originator_date)\n",
+    "print(\"Originator Time:\", info.bext.originator_time)\n",
+    "print(\"Time Reference:\", info.bext.time_reference)\n",
+    "print(info.bext.coding_history)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## iXML Production Recorder Metadata"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "iXML Project: BMH\n",
+      "iXML Scene: A101\n",
+      "iXML Take: 1\n",
+      "iXML Tape: 18Y12M31\n",
+      "iXML File Family Name: None\n",
+      "iXML File Family UID: USSDVGR1112089007124001008206300\n",
+      "A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch\r\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(\"iXML Project:\", info.ixml.project)\n",
+    "print(\"iXML Scene:\", info.ixml.scene)\n",
+    "print(\"iXML Take:\", info.ixml.take)\n",
+    "print(\"iXML Tape:\", info.ixml.tape)\n",
+    "print(\"iXML File Family Name:\", info.ixml.family_name)\n",
+    "print(\"iXML File Family UID:\", info.ixml.family_uid)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.7.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

examples/wavinfo.ipynb

@@ -57,7 +57,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "WavBextFormat(description='sSPEED=023.976-ND\\r\\nsTAKE=1\\r\\nsUBITS=$12311801\\r\\nsSWVER=2.67\\r\\nsPROJECT=BMH\\r\\nsSCENE=A101\\r\\nsFILENAME=A101_1.WAV\\r\\nsTAPE=18Y12M31\\r\\nsTRK1=MKH516 A\\r\\nsTRK2=Boom\\r\\nsNOTE=\\r\\n', originator='Sound Dev: 702T S#GR1112089007', originator_ref='USSDVGR1112089007124001008206301', originator_date='2018-12-31', originator_time='12:40:00', time_reference=2190940753, version=1, umid=b'\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00', loudness_value=0, loudness_range=0, max_true_peak=0, max_momentary_loudness=0, max_shortterm_loudness=0, coding_history='A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch\\r\\n')\n"
+      "WavBextFormat(description='sSPEED=023.976-ND\\r\\nsTAKE=1\\r\\nsUBITS=$12311801\\r\\nsSWVER=2.67\\r\\nsPROJECT=BMH\\r\\nsSCENE=A101\\r\\nsFILENAME=A101_1.WAV\\r\\nsTAPE=18Y12M31\\r\\nsTRK1=MKH516 A\\r\\nsTRK2=Boom\\r\\nsNOTE=\\r\\n', originator='Sound Dev: 702T S#GR1112089007', originator_ref='USSDVGR1112089007124001008206301', originator_date='2018-12-31', originator_time='12:40:00', time_reference=2190940753, version=1, umid=b'\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00', loudness_value=0.0, loudness_range=0.0, max_true_peak=0.0, max_momentary_loudness=0.0, max_shortterm_loudness=0.0, coding_history='A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch\\r\\n')\n"
      ]
     }
    ],
@@ -138,7 +138,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "WavBextFormat(description='dUBITS=12311804\\r\\ndSCENE=A101\\r\\ndTAKE=4\\r\\ndTAPE=18Y12M31\\r\\ndFRAMERATE=23.976ND\\r\\ndSPEED=023.976-NDF\\r\\ndTRK1=MKH516 A\\r\\ndTRK2=Boom\\r\\n', originator='Sound Dev: 702T S#GR1112089007', originator_ref='aa4CKtcd13Vk', originator_date='2018-12-31', originator_time='12:40:07', time_reference=2191709524, version=0, umid=b'\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00', loudness_value=0, loudness_range=0, max_true_peak=0, max_momentary_loudness=0, max_shortterm_loudness=0, coding_history='A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch\\r\\n')\n"
+      "WavBextFormat(description='dUBITS=12311804\\r\\ndSCENE=A101\\r\\ndTAKE=4\\r\\ndTAPE=18Y12M31\\r\\ndFRAMERATE=23.976ND\\r\\ndSPEED=023.976-NDF\\r\\ndTRK1=MKH516 A\\r\\ndTRK2=Boom\\r\\n', originator='Sound Dev: 702T S#GR1112089007', originator_ref='aa4CKtcd13Vk', originator_date='2018-12-31', originator_time='12:40:07', time_reference=2191709524, version=0, umid=b'\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00', loudness_value=0.0, loudness_range=0.0, max_true_peak=0.0, max_momentary_loudness=0.0, max_shortterm_loudness=0.0, coding_history='A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch\\r\\n')\n"
      ]
     }
    ],

tests/__init__.py

@@ -0,0 +1,2 @@
+from . import test_wave_parsing
+

tests/test_files/WaveAgentSoundReport.csv

@@ -0,0 +1 @@
+SOUND REPORT

tests/test_wave_parsing.py

@@ -0,0 +1,99 @@
+import os.path
+import json
+import subprocess
+
+from unittest import TestCase
+
+import wavinfo
+
+FFPROBE='/usr/local/bin/ffprobe'
+
+
+def ffprobe(path):
+
+    arguments = [ FFPROBE , "-of", "json" , "-show_format", "-show_streams", path ]
+
+    process = subprocess.run(arguments, stdin=None, capture_output=True)
+
+    if process.returncode == 0:
+        return json.loads(process.stdout)
+    else:
+        return None
+
+
+class TestWaveInfo(TestCase):
+
+
+    def all_files(self):
+        for dirpath, dirnames, filenames in os.walk('tests/test_files'):
+            for filename in filenames:
+                name, ext = os.path.splitext(filename)
+                if ext == '.wav':
+                    yield os.path.join(dirpath, filename)
+
+
+    def test_sanity(self):
+        for wav_file in self.all_files():
+            info = wavinfo.WavInfoReader(wav_file)
+            self.assertTrue(info is not None)
+
+    def test_fmt_against_ffprobe(self):
+        for wav_file in self.all_files():
+            info = wavinfo.WavInfoReader(wav_file)
+            ffprobe_info = ffprobe(wav_file)
+
+            self.assertEqual( info.fmt.channel_count , ffprobe_info['streams'][0]['channels']  )
+            self.assertEqual( info.fmt.sample_rate   , int(ffprobe_info['streams'][0]['sample_rate'])  )
+            self.assertEqual( info.fmt.bits_per_sample, int(ffprobe_info['streams'][0]['bits_per_raw_sample']) )
+
+            if info.fmt.audio_format == 1:
+                self.assertTrue(ffprobe_info['streams'][0]['codec_name'].startswith('pcm')  )
+                byte_rate = int(ffprobe_info['streams'][0]['sample_rate']) \
+                        * ffprobe_info['streams'][0]['channels'] \
+                        * int(ffprobe_info['streams'][0]['bits_per_raw_sample']) / 8
+                self.assertEqual( info.fmt.byte_rate     , byte_rate  )
+
+    def test_data_against_ffprobe(self):
+        for wav_file in self.all_files():
+            info = wavinfo.WavInfoReader(wav_file)
+            ffprobe_info = ffprobe(wav_file)
+
+            self.assertEqual( info.data.frame_count, int(ffprobe_info['streams'][0]['duration_ts'] ))
+
+    def test_bext_against_ffprobe(self):
+        for wav_file in self.all_files():
+            info = wavinfo.WavInfoReader(wav_file)
+            ffprobe_info = ffprobe(wav_file)
+
+            self.assertEqual( info.bext.description, ffprobe_info['format']['tags']['comment']  )
+            self.assertEqual( info.bext.originator, ffprobe_info['format']['tags']['encoded_by']  )
+            self.assertEqual( info.bext.originator_ref, ffprobe_info['format']['tags']['originator_reference']  )
+
+            # these don't always reflect the bext info
+            #self.assertEqual( info.bext.originator_date, ffprobe_info['format']['tags']['date']  )
+            #self.assertEqual( info.bext.originator_time, ffprobe_info['format']['tags']['creation_time']  )
+            self.assertEqual( info.bext.time_reference, int(ffprobe_info['format']['tags']['time_reference'])  )
+            self.assertEqual( info.bext.coding_history, ffprobe_info['format']['tags']['coding_history']  )
+
+    def test_ixml(self):
+        expected = {'A101_4.WAV': {'project' : 'BMH', 'scene': 'A101', 'take': '4',
+                        'tape': '18Y12M31', 'family_uid': 'USSDVGR1112089007124015008231000'},
+                    'A101_3.WAV': {'project' : 'BMH', 'scene': 'A101', 'take': '3',
+                        'tape': '18Y12M31', 'family_uid': 'USSDVGR1112089007124014008228300'},
+                    'A101_2.WAV': {'project' : 'BMH', 'scene': 'A101', 'take': '2',
+                        'tape': '18Y12M31', 'family_uid': 'USSDVGR1112089007124004008218600'},
+                    'A101_1.WAV': {'project' : 'BMH', 'scene': 'A101', 'take': '1',
+                        'tape': '18Y12M31', 'family_uid': 'USSDVGR1112089007124001008206300'},
+                }
+
+        for wav_file in self.all_files():
+            basename =  os.path.basename(wav_file)
+            if basename in expected:
+                info = wavinfo.WavInfoReader(wav_file)
+                e = expected[basename]
+
+                self.assertEqual( e['project'], info.ixml.project )
+                self.assertEqual( e['scene'], info.ixml.scene )
+                self.assertEqual( e['take'], info.ixml.take )
+                self.assertEqual( e['tape'], info.ixml.tape )
+                self.assertEqual( e['family_uid'], info.ixml.family_uid )

wavinfo/wave_reader.py

@@ -9,8 +9,8 @@ WavDataDescriptor = namedtuple('WavDataDescriptor','byte_count frame_count')
 
 WavInfoFormat = namedtuple("WavInfoFormat",'audio_format channel_count sample_rate byte_rate block_align bits_per_sample')
 
-WavBextFormat = namedtuple("WavBextFormat",'description originator originator_ref ' + 
+WavBextFormat = namedtuple("WavBextFormat",'description originator originator_ref ' +
-    'originator_date originator_time time_reference version umid ' + 
+    'originator_date originator_time time_reference version umid ' +
     'loudness_value loudness_range max_true_peak max_momentary_loudness max_shortterm_loudness ' +
     'coding_history')
 
@@ -25,10 +25,10 @@ class WavInfoReader():
     def __init__(self, path):
         with open(path, 'rb') as f:
             chunks = parse_chunk(f)
-            
+
             self.main_list = chunks.children
             f.seek(0)
-            
+
             self.fmt    = self._get_format(f)
             self.bext   = self._get_bext(f)
             self.ixml   = self._get_ixml(f)
@@ -53,14 +53,14 @@ 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, 
+        return WavDataDescriptor(byte_count= data_chunk.length,
                 frame_count= int(data_chunk.length / self.fmt.block_align))
-        
+
 
 
     def _get_format(self,f):
         fmt_data = self._find_chunk_data(b'fmt ',f)
-        
+
         # The format chunk is
         # audio_format    U16
         # channel_count   U16
@@ -70,9 +70,9 @@ class WavInfoReader():
         # bits_per_sampl  U16
         packstring = "<HHIIHH"
         rest_starts = struct.calcsize(packstring)
-        
+
         unpacked = struct.unpack(packstring, fmt_data[:rest_starts])
-        
+
         #0x0001	WAVE_FORMAT_PCM	PCM
         #0x0003	WAVE_FORMAT_IEEE_FLOAT	IEEE float
         #0x0006	WAVE_FORMAT_ALAW	8-bit ITU-T G.711 A-law
@@ -91,7 +91,7 @@ class WavInfoReader():
 
         bext_data = self._find_chunk_data(b'bext',f,default_none=True)
 
-        # description[256]      
+        # description[256]
         # originator[32]
         # originatorref[32]
         # originatordate[10]   "YYYY:MM:DD"
@@ -100,7 +100,7 @@ class WavInfoReader():
         # hightimeref U32
         # version U16
         # umid[64]
-        # 
+        #
         # EBU 3285 fields
         # loudnessvalue S16    (in LUFS*100)
         # loudnessrange S16    (in LUFS*100)
@@ -113,10 +113,10 @@ class WavInfoReader():
             return None
 
         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('\0'),
                 originator      = unpacked[1].decode('ascii').rstrip('\0'),
                 originator_ref  = unpacked[2].decode('ascii').rstrip('\0'),
@@ -125,11 +125,11 @@ class WavInfoReader():
                 time_reference  = unpacked[5],
                 version         = unpacked[6],
                 umid            = unpacked[7],
-                loudness_value  = unpacked[8],
+                loudness_value  = unpacked[8] / 100.0,
-                loudness_range  = unpacked[9],
+                loudness_range  = unpacked[9] / 100.0,
-                max_true_peak   = unpacked[10],
+                max_true_peak   = unpacked[10] / 100.0,
-                max_momentary_loudness = unpacked[11],
+                max_momentary_loudness = unpacked[11] / 100.0,
-                max_shortterm_loudness = unpacked[12],
+                max_shortterm_loudness = unpacked[12] / 100.0,
                 coding_history = bext_data[rest_starts:].decode('ascii').rstrip('\0')
                 )
 
@@ -141,8 +141,8 @@ class WavInfoReader():
 
         ixml_string = ixml_data.decode('utf-8')
         return WavIXMLFormat(ixml_string)
-        
 
 
-        
+
+