Update metadata.py

For documentation

.github/workflows/python-package.yml

@@ -0,0 +1,42 @@
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: Python Lint and Test
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8", "3.9", "3.10"]
+
+    steps:
+    - uses: actions/checkout@v2.5.0
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4.3.0
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install flake8 pytest
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Setup FFmpeg
+      uses: FedericoCarboni/setup-ffmpeg@v2
+    - name: Lint with flake8
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - name: Test with pytest
+      run: |
+        pytest

.github/workflows/pythonpublish.yml

@@ -0,0 +1,26 @@
+name: Upload Python Package
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install setuptools wheel twine lxml
+    - name: Build and publish
+      env:
+        TWINE_USERNAME: __token__
+        TWINE_PASSWORD: ${{ secrets.PYPI_APIKEY }}
+      run: |
+        python setup.py sdist bdist_wheel
+        twine upload dist/*

.gitignore

@@ -105,3 +105,4 @@ venv.bak/
 
 # vim swap
 *.swp
+.DS_Store

.idea/misc.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.7 (wavinfo)" project-jdk-type="Python SDK" />
+  <component name="PyPackaging">
+    <option name="earlyReleasesAsUpgrades" value="true" />
+  </component>
+</project>

.idea/wavinfo.iml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PYTHON_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/venv" />
+    </content>
+    <orderEntry type="jdk" jdkName="Python 3.7 (wavinfo)" jdkType="Python SDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/workspace.xml

@@ -0,0 +1,107 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="fb29ad56-fffe-478f-9c0e-1718aa04342e" name="Default Changelist" comment="">
+      <change beforePath="$PROJECT_DIR$/.idea/dictionaries/jamiehardt.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/dictionaries/jamiehardt.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/misc.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/misc.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/wavinfo.iml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/wavinfo.iml" afterDir="false" />
+    </list>
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FavoritesManager">
+    <favorites_list name="wavinfo" />
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Python Script" />
+      </list>
+    </option>
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+    <option name="UPDATE_TYPE" value="MERGE" />
+  </component>
+  <component name="ProjectId" id="1VtfP9ukGK4GNIXS2m0hRLG9d7w" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+    <option name="showMembers" value="true" />
+  </component>
+  <component name="PropertiesComponent">
+    <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
+    <property name="TODO_SCOPE" value="Project Files" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
+    <property name="settings.editor.selected.configurable" value="com.jetbrains.python.configuration.PyActiveSdkModuleConfigurable" />
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="project-level" UseSingleDictionary="true" transferred="true" />
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="fb29ad56-fffe-478f-9c0e-1718aa04342e" name="Default Changelist" comment="" />
+      <created>1578077284420</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1578077284420</updated>
+    </task>
+    <servers />
+  </component>
+  <component name="Vcs.Log.History.Properties">
+    <option name="COLUMN_ORDER">
+      <list>
+        <option value="0" />
+        <option value="2" />
+        <option value="3" />
+        <option value="1" />
+      </list>
+    </option>
+  </component>
+  <component name="Vcs.Log.Tabs.Properties">
+    <option name="TAB_STATES">
+      <map>
+        <entry key="MAIN">
+          <value>
+            <State />
+          </value>
+        </entry>
+      </map>
+    </option>
+    <option name="oldMeFiltersMigrated" value="true" />
+  </component>
+  <component name="WindowStateProjectService">
+    <state x="655" y="287" key="#com.intellij.openapi.updateSettings.impl.PluginUpdateInfoDialog" timestamp="1598547965709">
+      <screen x="0" y="0" width="1920" height="1080" />
+    </state>
+    <state x="655" y="287" key="#com.intellij.openapi.updateSettings.impl.PluginUpdateInfoDialog/1920.0.1920.1080/0.0.1920.1080/3840.0.1920.1080@0.0.1920.1080" timestamp="1598547965709" />
+    <state x="0" y="0" key="#com.intellij.refactoring.rename.AutomaticRenamingDialog" timestamp="1598555737671">
+      <screen x="0" y="0" width="1920" height="1080" />
+    </state>
+    <state x="0" y="0" key="#com.intellij.refactoring.rename.AutomaticRenamingDialog/1920.0.1920.1080/0.0.1920.1080/3840.0.1920.1080@0.0.1920.1080" timestamp="1598555737671" />
+    <state x="476" y="183" key="SettingsEditor" timestamp="1598548365517">
+      <screen x="0" y="0" width="1920" height="1080" />
+    </state>
+    <state x="476" y="183" key="SettingsEditor/1920.0.1920.1080/0.0.1920.1080/3840.0.1920.1080@0.0.1920.1080" timestamp="1598548365517" />
+    <state x="114" y="123" width="1706" height="842" key="com.intellij.history.integration.ui.views.FileHistoryDialog" timestamp="1597689482054">
+      <screen x="0" y="0" width="1920" height="1080" />
+    </state>
+    <state x="114" y="123" width="1706" height="842" key="com.intellij.history.integration.ui.views.FileHistoryDialog/1920.0.1920.1080/0.0.1920.1080/3840.0.1920.1080@0.0.1920.1080" timestamp="1597689482054" />
+    <state x="577" y="376" key="com.intellij.ide.util.TipDialog" timestamp="1601767353495">
+      <screen x="0" y="0" width="1920" height="1080" />
+    </state>
+    <state x="577" y="376" key="com.intellij.ide.util.TipDialog/1920.0.1920.1080/0.0.1920.1080/3840.0.1920.1080@0.0.1920.1080" timestamp="1598550975228" />
+    <state x="577" y="376" key="com.intellij.ide.util.TipDialog/1920.0.1920.1080/0.0.1920.1080@0.0.1920.1080" timestamp="1601767353495" />
+    <state x="772" y="468" key="com.intellij.openapi.vcs.update.UpdateOrStatusOptionsDialogupdate-v2" timestamp="1598547948993">
+      <screen x="0" y="0" width="1920" height="1080" />
+    </state>
+    <state x="772" y="468" key="com.intellij.openapi.vcs.update.UpdateOrStatusOptionsDialogupdate-v2/1920.0.1920.1080/0.0.1920.1080/3840.0.1920.1080@0.0.1920.1080" timestamp="1598547948993" />
+    <state x="632" y="254" width="670" height="676" key="search.everywhere.popup" timestamp="1598554315633">
+      <screen x="0" y="0" width="1920" height="1080" />
+    </state>
+    <state x="632" y="254" width="670" height="676" key="search.everywhere.popup/1920.0.1920.1080/0.0.1920.1080/3840.0.1920.1080@0.0.1920.1080" timestamp="1598554315633" />
+  </component>
+</project>

.readthedocs.yaml

@@ -0,0 +1,29 @@
+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.10"
+    # You can also specify other tool versions:
+    # nodejs: "16"
+    # rust: "1.55"
+    # golang: "1.17"
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+   configuration: docs/source/conf.py
+
+#If using Sphinx, optionally build your docs in additional formats such as PDF
+formats:
+   - pdf
+
+#Optionally declare the Python requirements required to build your docs
+python:
+   install:
+   - requirements: requirements.txt

.travis.yml

@@ -1,20 +0,0 @@
-dist: xenial
-language: python
-python:
-    - "3.6"
-    - "3.5"
-script:
-    - "python setup.py test"
-    - "py.test tests/ -v --cov wavinfo --cov-report term-missing"
-before_install:
-    - "sudo apt-get update"
-    - "sudo add-apt-repository universe"
-    - "sudo apt-get install -y ffmpeg"
-    - "pip install coverage"
-#    - "pip install coverage==4.4"
-    - "pip install pytest-cov==2.5.0"
-    - "pip install python-coveralls"
-install:
-    - "pip install setuptools"
-after_success:
-    - coveralls

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018 Jamie Hardt
+Copyright (c) 2020 Jamie Hardt
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,34 +1,32 @@
-[![Build Status](https://travis-ci.com/iluvcapra/wavinfo.svg?branch=master)](https://travis-ci.com/iluvcapra/wavinfo)
-[![Coverage Status](https://coveralls.io/repos/github/iluvcapra/wavinfo/badge.svg?branch=master)](https://coveralls.io/github/iluvcapra/wavinfo?branch=master)
 [![Documentation Status](https://readthedocs.org/projects/wavinfo/badge/?version=latest)](https://wavinfo.readthedocs.io/en/latest/?badge=latest) ![](https://img.shields.io/github/license/iluvcapra/wavinfo.svg) ![](https://img.shields.io/pypi/pyversions/wavinfo.svg) [![](https://img.shields.io/pypi/v/wavinfo.svg)](https://pypi.org/project/wavinfo/) ![](https://img.shields.io/pypi/wheel/wavinfo.svg)
-
+![Lint and Test](https://github.com/iluvcapra/wavinfo/actions/workflows/python-package.yml/badge.svg)
 
 # wavinfo
 
-
+The `wavinfo` package allows you to probe WAVE and [RF64/WAVE files][eburf64] and extract extended metadata, with an emphasis on film, video and professional music production metadata.
-The `wavinfo` package allows you to probe WAVE files and extract extended metadata, with an emphasis on 
-production metadata. 
 
 `wavinfo` reads:
 
-* __Broadcast-WAVE__ metadata, compliant with [EBU Tech 3285v2 (2011)][ebu], including embedded program 
+* __Broadcast-WAVE__ metadata<sup>[1][ebu]</sup>, including embedded program
-  loudness and coding history, if extant. This also includes the [SMPTE 330M __UMID__][smpte_330m2011] 
+  loudness and coding history, if extant. This also includes the SMPTE UMID<sup>[2][smpte_330m2011]</sup>.
-  Unique Materials Identifier.
+* __iXML__ production recorder metadata<sup>[3][ixml]</sup>, including project, scene, and take tags, recorder notes
-* [__iXML__ production recorder metadata][ixml], including project, scene, and take tags, recorder notes 
   and file family information.
-* Most of the common __RIFF INFO__ metadata fields.
+* Most of the common __RIFF INFO__<sup>[4][info-tags]</sup> metadata fields.
 * The __wav format__ is also parsed, so you can access the basic sample rate and channel count
   information.
 
 In progress:
+* ADM metadata consilient with the output of the __Dolby RMU__, perhaps later fully complaint with [ITU BS.2076-2][adm].
 * iXML `STEINBERG` sound library attributes.
+* __NetMix__ library attributes.
 * Pro Tools __embedded regions__.
 
 [ebu]:https://tech.ebu.ch/docs/tech/tech3285.pdf
+[adm]:https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.2076-2-201910-I!!PDF-E.pdf
 [smpte_330m2011]:http://standards.smpte.org/content/978-1-61482-678-1/st-330-2011/SEC1.abstract
 [ixml]:http://www.ixml.info
-
+[eburf64]:https://tech.ebu.ch/docs/tech/tech3306v1_1.pdf
-
+[info-tags]:https://exiftool.org/TagNames/RIFF.html#Info
 
 ## Demonstration
 
@@ -42,6 +40,12 @@ path = '../tests/test_files/A101_1.WAV'
 info = WavInfoReader(path)
 ```
 
+The package also installs a shell command:
+
+```sh
+$ wavinfo test_files/A101_1.WAV
+```
+
 ### Basic WAV Data
 
 The length of the file in frames (interleaved samples) and bytes is available, as is the contents of the format chunk.
@@ -53,104 +57,6 @@ The length of the file in frames (interleaved samples) and bytes is available, a
 >>> (48000, 2, 6, 24)
 ```
 
-### Broadcast WAV Extension
+## Other Resources
-
-A WAV file produced to Broadcast-WAV specifications will have the broadcast metadata extension,
-which includes a 256-character free text descrption, creating entity identifier (usually the 
-recording application or equipment), the date and time of recording and a time reference for 
-timecode synchronization.
-
-The `coding_history` is designed to contain a record of every conversion performed on the audio
-file.
-
-In this example (from a Sound Devices 702T) the bext metadata contains scene/take slating
-information in the `description`. Here also the `originator_ref` is a serial number conforming
-to EBU Rec 99.
-
-If the bext metadata conforms to EBU 3285 v1, it will contain the WAV's 32 or 64 byte SMPTE 
-330M UMID. The 32-byte version of the UMID is usually just a random number, while the 64-byte 
-UMID will also have information on the recording date and time, recording equipment and entity, 
-and geolocation data.
-
-If the bext metadata conforms to EBU 3285 v2, it will hold precomputed program loudness values
-as described by EBU Rec 128.
-
-```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
-
-iXML allows an XML document to be embedded in a WAV file.
-
-The iXML website recommends a schema for recorder information but 
-there is no official DTD and vendors mostly do their own thing, apart from 
-hitting a few key xpaths. iXML is used by most location/production recorders 
-to save slating information, timecode and sync points in a reliable way.
-
-iXML is also used to link "families" of WAV files together, so WAV files
-recorded simultaneously or contiguously can be related by a receiving client.
-
-```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
-
-
-### INFO Metadata
-
-INFO Metadata is a standard method for saving tagged text data in a WAV or AVI
-file. INFO fields are often read by the file explorer and host OS, and used in 
-music library software.
-
-```python
-bullet_path = '../tests/test_files/BULLET Impact Plastic LCD TV Screen Shatter Debris 2x.wav'
-
-bullet = WavInfoReader(bullet_path)
-```
-
-    print("INFO Artist:",    bullet.info.artist)
-    print("INFO Copyright:", bullet.info.copyright)
-    print("INFO Comment:",   bullet.info.comment)
-
 
+* For other file formats and ID3 decoding, look at [audio-metadata](https://github.com/thebigmunch/audio-metadata).

docs/Makefile

@@ -4,7 +4,7 @@
 # You can set these variables from the command line.
 SPHINXOPTS    =
 SPHINXBUILD   = sphinx-build
-SOURCEDIR     = .
+SOURCEDIR     = source
 BUILDDIR      = _build
 
 # Put it first so that "make" without argument is like "make help".

docs/make.bat

@@ -1,35 +0,0 @@
-@ECHO OFF
-
-pushd %~dp0
-
-REM Command file for Sphinx documentation
-
-if "%SPHINXBUILD%" == "" (
-	set SPHINXBUILD=sphinx-build
-)
-set SOURCEDIR=.
-set BUILDDIR=_build
-
-if "%1" == "" goto help
-
-%SPHINXBUILD% >NUL 2>NUL
-if errorlevel 9009 (
-	echo.
-	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
-	echo.installed, then set the SPHINXBUILD environment variable to point
-	echo.to the full path of the 'sphinx-build' executable. Alternatively you
-	echo.may add the Sphinx directory to PATH.
-	echo.
-	echo.If you don't have Sphinx installed, grab it from
-	echo.http://sphinx-doc.org/
-	exit /b 1
-)
-
-%SPHINXBUILD% -M %1 %SOURCEDIR% %BUILDDIR% %SPHINXOPTS%
-goto end
-
-:help
-%SPHINXBUILD% -M help %SOURCEDIR% %BUILDDIR% %SPHINXOPTS%
-
-:end
-popd

docs/source/classes.rst

@@ -0,0 +1,18 @@
+Other wavinfo Classes
+===============
+
+
+.. autoclass:: wavinfo.wave_reader.WavInfoReader
+   :members:
+
+   .. automethod:: __init__
+   
+
+.. autoclass:: wavinfo.wave_reader.WavAudioFormat
+   :members:
+
+.. autoclass:: wavinfo.wave_reader.WavDataDescriptor
+   :members:
+
+
+

docs/source/conf.py

@@ -14,19 +14,21 @@
 #
 import os
 import sys
-sys.path.insert(0, os.path.abspath('..'))
+sys.path.insert(0, os.path.abspath('../..'))
+sys.path.insert(0, os.path.abspath("../../.."))
+print(sys.path)
 
 
 # -- Project information -----------------------------------------------------
 
 project = u'wavinfo'
-copyright = u'2019, Jamie Hardt'
+copyright = u'2022, Jamie Hardt'
 author = u'Jamie Hardt'
 
 # The short X.Y version
 version = u''
 # The full version, including alpha/beta/rc tags
-release = u'v1.0'
+release = u'v1.7.1'
 
 
 # -- General configuration ---------------------------------------------------
@@ -61,7 +63,7 @@ master_doc = 'index'
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = 'en'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.

docs/source/index.rst

@@ -8,21 +8,14 @@ Welcome to wavinfo's documentation!
 
 .. toctree::
    :maxdepth: 2
-   :caption: Contents:
+   :caption: Notes:
   
-.. module:: wavinfo
+   metadata_scopes/bext.rst
+   metadata_scopes/ixml.rst
+   metadata_scopes/info.rst
 
-.. autoclass:: WavInfoReader
+   classes
-   :members:
 
-   .. automethod:: __init__
-   
-
-.. autoclass:: wavinfo.wave_reader.WavAudioFormat
-   :members:
-
-.. autoclass:: wavinfo.wave_reader.WavDataDescriptor
-   :members:
 
 Indices and tables
 ==================

docs/source/metadata_scopes/bext.rst

@@ -0,0 +1,71 @@
+Broadcast WAV Extension
+=======================
+
+
+Notes
+-----
+A WAV file produced to Broadcast-WAV specifications will have the broadcast metadata extension,
+which includes a 256-character free text descrption, creating entity identifier (usually the 
+recording application or equipment), the date and time of recording and a time reference for 
+timecode synchronization.
+
+The `coding_history` is designed to contain a record of every conversion performed on the audio
+file.
+
+In this example (from a Sound Devices 702T) the bext metadata contains scene/take slating
+information in the `description`. Here also the `originator_ref` is a serial number conforming
+to EBU Rec 99.
+
+If the bext metadata conforms to EBU 3285 v1, it will contain the WAV's 32 or 64 byte SMPTE 
+330M UMID. The 32-byte version of the UMID is usually just a random number, while the 64-byte 
+UMID will also have information on the recording date and time, recording equipment and entity, 
+and geolocation data.
+
+If the bext metadata conforms to EBU 3285 v2, it will hold precomputed program loudness values
+as described by EBU Rec 128.
+
+..  code:: 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)
+
+Result: 
+
+::
+
+    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
+
+
+Class Reference
+---------------
+
+.. module:: wavinfo
+
+.. autoclass:: wavinfo.wave_bext_reader.WavBextReader
+   :members:
+
+

docs/source/metadata_scopes/info.rst

@@ -0,0 +1,33 @@
+INFO Metadata
+=============
+
+Notes
+-----
+
+INFO Metadata is a standard method for saving tagged text data in a WAV or AVI
+file. INFO fields are often read by the file explorer and host OS, and used in 
+music library software.
+
+
+..  code:: python
+
+    bullet_path = '../tests/test_files/BULLET Impact Plastic LCD TV Screen Shatter Debris 2x.wav'
+
+    bullet = WavInfoReader(bullet_path)
+
+    print("INFO Artist:",    bullet.info.artist)
+    print("INFO Copyright:", bullet.info.copyright)
+    print("INFO Comment:",   bullet.info.comment)
+
+
+Class Reference
+---------------
+
+.. module:: wavinfo
+
+.. autoclass:: wavinfo.wave_info_reader.WavInfoChunkReader
+   :members:
+
+
+
+

docs/source/metadata_scopes/ixml.rst

@@ -0,0 +1,45 @@
+iXML Production Recorder Metadata
+=================================
+
+Notes
+-----
+iXML allows an XML document to be embedded in a WAV file.
+
+The iXML website recommends a schema for recorder information but 
+there is no official DTD and vendors mostly do their own thing, apart from 
+hitting a few key xpaths. iXML is used by most location/production recorders 
+to save slating information, timecode and sync points in a reliable way.
+
+iXML is also used to link "families" of WAV files together, so WAV files
+recorded simultaneously or contiguously can be related by a receiving client.
+
+..  code:: 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)
+
+Result:
+
+::
+
+    iXML Project: BMH
+    iXML Scene: A101
+    iXML Take: 1
+    iXML Tape: 18Y12M31
+    iXML File Family Name: None
+    iXML File Family UID: USSDVGR1112089007124001008206300
+
+
+Class Reference
+---------------
+
+.. module:: wavinfo
+
+.. autoclass:: wavinfo.wave_ixml_reader.WavIXMLFormat
+   :members:
+
+

metadata.py

@@ -0,0 +1,6 @@
+"""
+Wavinfo
+"""
+__version__ = '1.7.1'
+__author__ = 'Jamie Hardt <jamiehardt@gmail.com>'
+__license__ = "MIT"

pypi_upload.sh

@@ -1,2 +0,0 @@
-#!/bin/bash
-python3 -m twine upload --repository-url https://upload.pypi.org/legacy/ dist/*

requirements.txt

@@ -0,0 +1,19 @@
+attrs==21.4.0
+ear==2.1.0
+enum34==1.1.10
+exceptiongroup==1.0.4
+iniconfig==1.1.1
+lxml==4.9.1
+multipledispatch==0.6.0
+numpy==1.23.3
+packaging==21.3
+pluggy==1.0.0
+pyparsing==3.0.9
+pytest==7.2.0
+ruamel.yaml==0.17.21
+ruamel.yaml.clib==0.2.6
+scipy==1.9.1
+six==1.16.0
+style==1.1.0
+tomli==2.0.1
+update==0.0.1

setup.py

@@ -1,20 +1,39 @@
 from setuptools import setup
+from metadata import __author__, __license__, __version__
 
 with open("README.md", "r") as fh:
     long_description = fh.read()
 
 setup(name='wavinfo',
-      version='1.1',
+      version=__version__,
-      author='Jamie Hardt',
+      author=__author__,
       author_email='jamiehardt@me.com',
-      description='WAVE sound file metadata parser.',
+      description='Probe WAVE Files for iXML, Broadcast-WAVE and other metadata.',
       long_description_content_type="text/markdown",
       long_description=long_description,
+      license=__license__,
       url='https://github.com/iluvcapra/wavinfo',
+      project_urls={
+          'Source':
+              'https://github.com/iluvcapra/wavinfo',
+          'Documentation':
+              'https://wavinfo.readthedocs.io/',
+          'Issues':
+              'https://github.com/iluvcapra/wavinfo/issues',
+      },
+      packages=['wavinfo'],
       classifiers=['Development Status :: 5 - Production/Stable',
           'License :: OSI Approved :: MIT License',
           'Topic :: Multimedia',
           'Topic :: Multimedia :: Sound/Audio',
-          "Programming Language :: Python :: 3.5",
+          "Programming Language :: Python :: 3.8",
-          "Programming Language :: Python :: 3.6"],
+          "Programming Language :: Python :: 3.9",
-      packages=['wavinfo'])
+          "Programming Language :: Python :: 3.10"],
+      keywords='waveform metadata audio ebu smpte avi library film tv editing editorial',
+      install_requires=['lxml', 'ear'],
+      entry_points={
+          'console_scripts': [
+              'wavinfo = wavinfo.__main__:main'
+          ]
+      }
+      )

tests/__init__.py

@@ -1,2 +1,3 @@
 from . import test_wave_parsing
 
+

tests/test_walk.py

@@ -0,0 +1,25 @@
+import unittest
+import wavinfo
+
+
+class TestWalk(unittest.TestCase):
+    def test_walk_metadata(self):
+        test_file = 'tests/test_files/protools/PT A101_4.A1.wav'
+        info = wavinfo.WavInfoReader(test_file)
+
+        tested_data , tested_format = False, False
+        for scope, key, value in info.walk():
+            if scope == 'fmt':
+                if key == 'channel_count':
+                    tested_format = True
+                    self.assertEqual(value, 2)
+            if scope == 'data':
+                if key == 'frame_count':
+                    tested_data = True
+                    self.assertEqual(value, 144140)
+
+        self.assertTrue(tested_data and tested_format)
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/test_wave_parsing.py

@@ -1,46 +1,22 @@
 import os.path
-import json
+import sys
-import subprocess
-from subprocess import PIPE
 
 from unittest import TestCase
 
+from .utils import all_files, ffprobe
+
 import wavinfo
 
-FFPROBE='ffprobe'
-
-
-def ffprobe(path):
-
-    arguments = [ FFPROBE , "-of", "json" , "-show_format", "-show_streams", path ]
-
-    process = subprocess.run(arguments, stdin=None, stdout=PIPE, stderr=PIPE)
-
-    if process.returncode == 0:
-        output_str = process.stdout.decode('utf-8')
-        return json.loads(output_str)
-    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 in ['.wav','.WAV']:
-                    yield os.path.join(dirpath, filename)
-
-
     def test_sanity(self):
-        for wav_file in self.all_files():
+        for wav_file in all_files():
             info = wavinfo.WavInfoReader(wav_file)
-            self.assertTrue(info is not None)
+            self.assertEqual(info.__repr__(), 'WavInfoReader({}, latin_1, ascii)'.format(os.path.abspath(wav_file)))
+            self.assertIsNotNone(info)
 
     def test_fmt_against_ffprobe(self):
-        for wav_file in self.all_files():
+        for wav_file in all_files():
             info = wavinfo.WavInfoReader(wav_file)
             ffprobe_info = ffprobe(wav_file)
 
@@ -50,25 +26,31 @@ class TestWaveInfo(TestCase):
 
             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']) \
+                streams = ffprobe_info['streams'][0]
-                        * ffprobe_info['streams'][0]['channels'] \
+                byte_rate = int(streams['sample_rate']) * streams['channels'] * int(streams['bits_per_raw_sample']) / 8
-                        * 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():
+        for wav_file in 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():
+        for wav_file in all_files():
             info = wavinfo.WavInfoReader(wav_file)
             ffprobe_info = ffprobe(wav_file)
             if info.bext:
+                if 'comment' in ffprobe_info['format']['tags']:
                     self.assertEqual(info.bext.description, ffprobe_info['format']['tags']['comment'])
+                else:
+                    self.assertEqual(info.bext.description, '')
+
+                if 'encoded_by' in ffprobe_info['format']['tags']:
                     self.assertEqual(info.bext.originator, ffprobe_info['format']['tags']['encoded_by'])
+                else:
+                    self.assertEqual(info.bext.originator, '')
+
                 if 'originator_reference' in ffprobe_info['format']['tags']:
                     self.assertEqual(info.bext.originator_ref, ffprobe_info['format']['tags']['originator_reference'])
                 else:
@@ -95,7 +77,7 @@ class TestWaveInfo(TestCase):
                                    'tape': '18Y12M31', 'family_uid': 'USSDVGR1112089007124001008206300'},
                     }
 
-        for wav_file in self.all_files():
+        for wav_file in all_files():
             basename = os.path.basename(wav_file)
             if basename in expected:
                 info = wavinfo.WavInfoReader(wav_file)
@@ -106,3 +88,27 @@ class TestWaveInfo(TestCase):
                 self.assertEqual(e['take'], info.ixml.take)
                 self.assertEqual(e['tape'], info.ixml.tape)
                 self.assertEqual(e['family_uid'], info.ixml.family_uid)
+
+                for track in info.ixml.track_list:
+                    self.assertIsNotNone(track.channel_index)
+                    if basename == 'A101_4.WAV' and track.channel_index == '1':
+                        self.assertEqual(track.name, 'MKH516 A')
+
+    def test_metadata(self):
+        file_with_metadata = 'tests/test_files/sound_grinder_pro/new_camera bumb 1.wav'
+        self.assertTrue(os.path.exists(file_with_metadata))
+        info = wavinfo.WavInfoReader(file_with_metadata).info
+        self.assertEqual(info.title, 'camera bumb 1')
+        self.assertEqual(info.artist, 'Jamie Hardt')
+        self.assertEqual(info.copyright, '© 2010 Jamie Hardt')
+        self.assertEqual(info.product, 'Test Sounds')  # album
+        self.assertEqual(info.album, info.product)
+        self.assertEqual(info.comment, 'Comments')
+        self.assertEqual(info.software, 'Sound Grinder Pro')
+        self.assertEqual(info.created_date, '2010-12-28')
+        self.assertEqual(info.engineer, 'JPH')
+        self.assertEqual(info.keywords, 'Sound Effect, movement, microphone, bump')
+        self.assertEqual(info.title, 'camera bumb 1')
+        self.assertEqual(type(info.to_dict()), dict)
+        self.assertEqual(type(info.__repr__()), str)
+

tests/test_zoom_f8.py

@@ -0,0 +1,13 @@
+import os.path
+import sys
+import json
+import subprocess
+from subprocess import PIPE
+
+from unittest import TestCase
+
+import wavinfo
+
+
+class TestZoomF8(TestCase):
+    pass

tests/utils.py

@@ -0,0 +1,36 @@
+import os.path
+import sys
+import subprocess
+from subprocess import PIPE
+import json
+
+FFPROBE = 'ffprobe'
+
+
+def ffprobe(path):
+    arguments = [FFPROBE, "-of", "json", "-show_format", "-show_streams", path]
+    if int(sys.version[0]) <  3:
+        process = subprocess.Popen(arguments, stdout=PIPE)
+        process.wait()
+        if process.returncode == 0:
+            output = process.communicate()[0]
+            if output:
+                output_str = output.decode('utf-8')
+                return json.loads(output_str)
+        else:
+            return None
+    else: 
+        process = subprocess.run(arguments, stdin=None, stdout=PIPE, stderr=PIPE)
+        if process.returncode == 0:
+            output_str = process.stdout.decode('utf-8')
+            return json.loads(output_str)
+        else:
+            return None
+
+
+def all_files():
+    for dirpath, _, filenames in os.walk('tests/test_files'):
+        for filename in filenames:
+            _, ext = os.path.splitext(filename)
+            if ext in ['.wav', '.WAV']:
+                yield os.path.join(dirpath, filename)

wavinfo/__init__.py

@@ -1,14 +1,9 @@
-# -*- coding: utf-8 -*-
+"""
-
+methods to probe a WAV file for various kinds of production metadata.
-# :module:`wavinfo` provides methods to probe a WAV file for
-# various kinds of production metadata.
-#
-#
-#
-#
 
+Go to the documentation for wavinfo.WavInfoReader for more information.
+"""
 
 from .wave_reader import WavInfoReader
+from .riff_parser import WavInfoEOFError
 
-__version__ = '1.1'
-__author__ = 'Jamie Hardt'

wavinfo/__main__.py

@@ -0,0 +1,34 @@
+from optparse import OptionParser, OptionGroup
+import datetime
+from . import WavInfoReader
+import sys
+import json
+
+
+def main():
+    parser = OptionParser()
+
+    parser.usage = 'wavinfo [FILE.wav]*'
+
+    # parser.add_option('-f', dest='output_format', help='Set the output format',
+    #                   default='json',
+    #                   metavar='FORMAT')
+
+    (options, args) = parser.parse_args(sys.argv)
+    for arg in args[1:]:
+        try:
+            this_file = WavInfoReader(path=arg)
+            ret_dict = {'file_argument': arg, 'run_date': datetime.datetime.now().isoformat() , 'scopes': {}}
+            for scope, name, value in this_file.walk():
+                if scope not in ret_dict['scopes'].keys():
+                    ret_dict['scopes'][scope] = {}
+
+                ret_dict['scopes'][scope][name] = value
+
+            json.dump(ret_dict, fp=sys.stdout, indent=2)
+        except Exception as e:
+            print(e)
+
+
+if __name__ == "__main__":
+    main()

wavinfo/dolby_parser.py

@@ -0,0 +1,188 @@
+# Dolby RMU Metadata per EBU Tech 3285 Supp 6
+#
+# https://tech.ebu.ch/docs/tech/tech3285s6.pdf
+#
+
+from struct import unpack, calcsize
+from enum import (Enum, IntEnum)
+
+CHUNK_IDENT = "dbmd"
+DOLBY_VERSION = "1.0.0.6"
+
+
+class _DPPGenericDownMixLevel(Enum):
+    PLUS_3DB = 0b000
+    PLUS_1_5DB = 0b001
+    UNITY = 0b010
+    MINUS_1_5DB = 0b011
+    MINUS_3DB = 0b100
+    MINUS_4_5DB = 0b101
+    MINUS_6DB = 0b110
+    MUTE = 0b111
+
+
+class DPPDolbySurroundEncodingMode(Enum):
+    RESERVED = 0b11
+    IN_USE = 0b10
+    NOT_IN_USE = 0b01
+    NOT_INDICATED = 0b00
+
+# DPPLoRoDownMixCenterLevel
+# DPPLtRtCenterMixLevel
+# DPPLtRtSurroundMixLevel
+
+class DolbyMetadataSegmentTypes(IntEnum):
+    END_MARKER = 0
+    DOLBY_E_METADATA = 1
+    DOLBY_DIGITAL_METADATA = 3
+    DOLBY_DIGITAL_PLUS_METADATA = 7
+    AUDIO_INFO = 8
+
+
+class DDPBitStreamMode(Enum):
+    """
+    Dolby Digital Plus `bsmod` field
+    § 4.3.2.2
+    """
+    COMPLETE_MAIN = 0b000
+    MUSIC_AND_EFFECTS = 0b001
+    VISUALLY_IMPAIRED = 0b010
+    HEARING_IMPAIRED = 0b011
+    DIALOGUE_ONLY = 0b100
+    COMMENTARY = 0b101
+    EMERGENCY = 0b110
+    VOICEOVER = 0b111 # if audioconfigmode is 1_0
+    KARAOKE = 0b1000  # if audioconfigmode is not 1_0
+
+
+class DDPAudioCodingMode(Enum):
+    """
+    Dolby Digital Plus `acmod` field
+    § 4.3.2.3
+    """
+    RESERVED = 0b000
+    CH_ORD_1_0 = 0b001
+    CH_ORD_2_0 = 0b010
+    CH_ORD_3_0 = 0b011
+    CH_ORD_2_1 = 0b100
+    CH_ORD_3_1 = 0b101
+    CH_ORD_2_2 = 0b110
+    CH_ORD_3_2 = 0b111
+
+
+class DPPCenterDownMixLevel(Enum):
+    """
+    § 4.3.3.1
+    """
+    DOWN_3DB = 0b00
+    DOWN_45DB = 0b01
+    DOWN_6DB = 0b10
+    RESERVED = 0b11
+
+
+class DPPSurroundDownMixLevel(Enum):
+    """
+    Dolby Digital Plus `surmixlev` field
+    § 4.3.3.2
+    """
+    DOWN_3DB = 0b00
+    DOWN_6DB = 0b01
+    MUTE = 0b10
+    RESERVED = 0b11
+
+
+class DPPLanguageCode(Enum):
+    """
+    § 4.3.4.1 , 4.3.5 (always 0xFF)
+    """
+    # this is removed in https://www.atsc.org/wp-content/uploads/2015/03/A52-201212-17.pdf § 5.4.2.12
+    # It should just be 0xff
+    pass
+
+
+class DPPMixLevel(int):
+    pass
+
+
+class DPPDialnormLevel(int):
+    pass
+
+
+class DPPRoomTime(Enum):
+    """
+    `roomtyp` 4.3.6.3
+    """
+    NOT_INDICATED = 0b00
+    LARGE_ROOM_X_CURVE = 0b01
+    SMALL_ROOM_FLAT_CURVE = 0b10
+    RESERVED = 0b11
+
+
+class DPPPreferredDownMixMode(Enum):
+    """
+    § 4.3.8.1
+    """
+    NOT_INDICATED = 0b00
+    PRO_LOGIC = 0b01
+    STEREO = 0b10
+    PRO_LOGIC_2 = 0b11
+
+
+# class DPPLtRtCenterMixLevel(_DPPGenericDownMixLevel):
+#     pass
+#
+#
+# class DPPLtRtSurroundMixLevel(_DPPGenericDownMixLevel):
+#     pass
+#
+#
+# class DPPSurroundEXMode(_DPPGenericInUseIndicator):
+#     pass
+#
+#
+# class DPPHeadphoneMode(_DPPGenericInUseIndicator):
+#     pass
+
+
+class DPPADConverterType(Enum):
+    STANDARD = 0
+    HDCD = 1
+
+
+class DDPStreamDependency(Enum):
+    """
+    Encodes `ddplus_info1.stream_type` field § 4.3.12.1
+    """
+    INDEPENDENT = 0
+    DEPENDENT = 1
+    INDEPENDENT_FROM_DOLBY_DIGITAL = 2
+    RESERVED = 3
+
+
+class DDPDataRate(int):
+    pass
+
+
+class DPPRFCompressionProfile(Enum):
+    NONE = 0
+    FILM_STANDARD = 1
+    FILM_LIGHT = 2
+    MUSIC_STANDARD = 3
+    MUSIC_LIGHT = 4
+    SPEECH = 5
+
+
+class DolbyDigitalPlusMetadata:
+
+    @classmethod
+    def parse(cls, binary_data):
+        binary_format = "<BBxxBBBBBBBBBBBBBxxxBxxxxxH"
+        assert len(binary_data >= calcsize(binary_format))
+        fields = unpack(binary_format, binary_data)
+
+
+class WavDolbyReader:
+    def __init__(self, dolby_data):
+        version, remainder = unpack("<U", dolby_data[0]), dolby_data[1:]
+
+        ## FIXME continues...

wavinfo/rf64_parser.py

@@ -0,0 +1,40 @@
+import struct
+from collections import namedtuple
+from . import riff_parser
+
+RF64Context = namedtuple('RF64Context','sample_count bigchunk_table')
+
+
+def parse_rf64(stream, signature = b'RF64'):
+    # print("starting parse_rf64")
+    start = stream.tell()
+    assert( stream.read(4) == b'WAVE' )
+
+    ds64_chunk = riff_parser.parse_chunk(stream)
+
+    ds64_field_spec = "<QQQI"
+    ds64_fields_size = struct.calcsize(ds64_field_spec)
+    assert(ds64_chunk.ident == b'ds64')
+
+    ds64_data = ds64_chunk.read_data(stream)
+    assert(len(ds64_data) >= ds64_fields_size )
+
+    # print("Read ds64 chunk: len()",len(ds64_data))
+    riff_size, data_size, sample_count, length_lookup_table = struct.unpack( ds64_field_spec , ds64_data[0:ds64_fields_size] )
+
+    bigchunk_table = {}
+    chunksize64format = "<4sL"
+    chunksize64size = struct.calcsize(chunksize64format)
+    # print("Found chunks64s:", length_lookup_table)
+
+    for n in range(length_lookup_table):
+        bigname, bigsize = struct.unpack_from( chunksize64format , ds64_data, offset= ds64_fields_size )
+        bigchunk_table[bigname] = bigsize
+
+    bigchunk_table[b'data'] = data_size
+    bigchunk_table[signature] = riff_size
+
+    stream.seek(start, 0)
+    # print("returning from parse_rf64, context: ", RF64Context(sample_count=sample_count, bigchunk_table=bigchunk_table))
+    return RF64Context( sample_count=sample_count, bigchunk_table=bigchunk_table )
+

wavinfo/riff_parser.py

@@ -1,64 +1,73 @@
 
 import struct
-import pdb
 from collections import namedtuple
+from .rf64_parser import parse_rf64
+
+
+class WavInfoEOFError(EOFError):
+    def __init__(self, identifier, chunk_start):
+        self.identifier = identifier
+        self.chunk_start = chunk_start
+
 
 class ListChunkDescriptor(namedtuple('ListChunkDescriptor', 'signature children')):
-
+    pass
-    def find(chunk_path):
+    # def find(self, chunk_path):
-        if len(chunk_path) > 1:
+    #     if len(chunk_path) > 1:
-            for chunk in self.children:
+    #         for chunk in self.children:
-                if type(chunk) is ListChunkDescriptor and \
+    #             if type(chunk) is ListChunkDescriptor and \
-                        chunk.signature is chunk_path[0]:
+    #                     chunk.signature is chunk_path[0]:
-                            return chunk.find(chunk_path[1:])
+    #                 return chunk.find(chunk_path[1:])
-        else:
+    #     else:
-            for chunk in self.children:
+    #         for chunk in self.children:
-                if type(chunk) is ChunkDescriptor and \
+    #             if type(chunk) is ChunkDescriptor and \
-                        chunk.ident is chunk_path[0]:
+    #                     chunk.ident is chunk_path[0]:
-                            return chunk
+    #                 return chunk
 
 
-class ChunkDescriptor(namedtuple('ChunkDescriptor', 'ident start length') ):
+class ChunkDescriptor(namedtuple('ChunkDescriptor', 'ident start length rf64_context')):
     def read_data(self, from_stream):
         from_stream.seek(self.start)
         return from_stream.read(self.length)
 
-def parse_list_chunk(stream, length):
-    start = stream.tell()
 
+def parse_list_chunk(stream, length, rf64_context=None):
+    start = stream.tell()
     signature = stream.read(4)
 
     children = []
-    while (stream.tell() - start) < length:
+    while stream.tell() - start + 8 < length:
-        child_chunk = parse_chunk(stream)
+        child_chunk = parse_chunk(stream, rf64_context=rf64_context)
-        if child_chunk:
         children.append(child_chunk)
-        else: 
+
-             break
+    stream.seek(start + length)
 
     return ListChunkDescriptor(signature=signature, children=children)
 
-def parse_chunk(stream):
+
-    #breakpoint()
+def parse_chunk(stream, rf64_context=None):
+    header_start = stream.tell()
     ident = stream.read(4)
-    if len(ident) != 4:
+    size_bytes = stream.read(4)
-        return
 
-    sizeb = stream.read(4)
+    if len(ident) != 4 or len(size_bytes) != 4:
-    size  = struct.unpack('<I',sizeb)[0]
+        raise WavInfoEOFError(identifier=ident, chunk_start=header_start)
 
-    displacement = size
+    data_size = struct.unpack('<I', size_bytes)[0]
-    if displacement % 2 is not 0:
-        displacement = displacement + 1
 
-    if ident in [b'RIFF',b'LIST']:
+    if data_size == 0xFFFFFFFF:
-        return parse_list_chunk(stream=stream, length=size)
+        if rf64_context is None and ident in {b'RF64', b'BW64'}:
+            rf64_context = parse_rf64(stream=stream, signature=ident)
+
+        data_size = rf64_context.bigchunk_table[ident]
+
+    displacement = data_size
+    if displacement % 2:
+        displacement += 1
+
+    if ident in {b'RIFF', b'LIST', b'RF64', b'BW64'}:
+        return parse_list_chunk(stream=stream, length=data_size, rf64_context=rf64_context)
     else:
-        start = stream.tell()
+        data_start = stream.tell()
         stream.seek(displacement, 1)
-        return ChunkDescriptor(ident=ident, start=start, length=size)
+        return ChunkDescriptor(ident=ident, start=data_start, length=data_size, rf64_context=rf64_context)
-
-
-
-
-

wavinfo/umid_parser.py

@@ -0,0 +1,121 @@
+from functools import reduce
+
+
+def binary_to_string(binary_value):
+    return reduce(lambda val, el: val + "{:02x}".format(el), binary_value, '')
+
+
+class UMIDParser:
+    """
+    Parse a raw binary SMPTE 330M Universal Materials Identifier
+
+    This implementation is based on SMPTE ST 330:2011
+    """
+    def __init__(self, raw_umid: bytes):
+        self.raw_umid = raw_umid
+    #
+    # @property
+    # def universal_label(self) -> bytearray:
+    #     return self.raw_umid[0:12]
+    #
+    # @property
+    # def basic_umid(self):
+    #     return self.raw_umid[0:32]
+
+    def basic_umid_to_str(self):
+        return binary_to_string(self.raw_umid[0:32])
+    #
+    # @property
+    # def universal_label_is_valid(self) -> bool:
+    #     valid_preamble = b'\x06\x0a\x2b\x34\x01\x01\x01\x05\x01\x01'
+    #     return self.universal_label[0:len(valid_preamble)] == valid_preamble
+    #
+    # @property
+    # def material_type(self) -> str:
+    #     material_byte = self.raw_umid[10]
+    #     if material_byte == 0x1:
+    #         return 'picture'
+    #     elif material_byte == 0x2:
+    #         return 'audio'
+    #     elif material_byte == 0x3:
+    #         return 'data'
+    #     elif material_byte == 0x4:
+    #         return 'other'
+    #     elif material_byte == 0x5:
+    #         return 'picture_single_component'
+    #     elif material_byte == 0x6:
+    #         return 'picture_multiple_component'
+    #     elif material_byte == 0x7:
+    #         return 'audio_single_component'
+    #     elif material_byte == 0x9:
+    #         return 'audio_multiple_component'
+    #     elif material_byte == 0xb:
+    #         return 'auxiliary_single_component'
+    #     elif material_byte == 0xc:
+    #         return 'auxiliary_multiple_component'
+    #     elif material_byte == 0xd:
+    #         return 'mixed_components'
+    #     elif material_byte == 0xf:
+    #         return 'not_identified'
+    #     else:
+    #         return 'not_recognized'
+    #
+    # @property
+    # def material_number_creation_method(self) -> str:
+    #     method_byte = self.raw_umid[11]
+    #     method_byte = (method_byte << 4) & 0xf
+    #     if method_byte == 0x0:
+    #         return 'undefined'
+    #     elif method_byte == 0x1:
+    #         return 'smpte'
+    #     elif method_byte == 0x2:
+    #         return 'uuid'
+    #     elif method_byte == 0x3:
+    #         return 'masked'
+    #     elif method_byte == 0x4:
+    #         return 'ieee1394'
+    #     elif 0x5 <= method_byte <= 0x7:
+    #         return 'reserved_undefined'
+    #     else:
+    #         return 'unrecognized'
+    #
+    # @property
+    # def instance_number_creation_method(self) -> str:
+    #     method_byte = self.raw_umid[11]
+    #     method_byte = method_byte & 0xf
+    #     if method_byte == 0x0:
+    #         return 'undefined'
+    #     elif method_byte == 0x01:
+    #         return 'local_registration'
+    #     elif method_byte == 0x02:
+    #         return '24_bit_prs'
+    #     elif method_byte == 0x03:
+    #         return 'copy_number_and_16_bit_prs'
+    #     elif 0x04 <= method_byte <= 0x0e:
+    #         return 'reserved_undefined'
+    #     elif method_byte == 0x0f:
+    #         return 'live_stream'
+    #     else:
+    #         return 'unrecognized'
+    #
+    # @property
+    # def indicated_length(self) -> str:
+    #     if self.raw_umid[12] == 0x13:
+    #         return 'basic'
+    #     elif self.raw_umid[12] == 0x33:
+    #         return 'extended'
+    #
+    # @property
+    # def instance_number(self) -> bytearray:
+    #     return self.raw_umid[13:3]
+    #
+    # @property
+    # def material_number(self) -> bytearray:
+    #     return self.raw_umid[16:16]
+    #
+    # @property
+    # def source_pack(self) -> Union[bytearray, None]:
+    #     if self.indicated_length == 'extended':
+    #         return self.raw_umid[32:32]
+    #     else:
+    #         return None

wavinfo/wave_axml_reader.py

@@ -0,0 +1,9 @@
+from lxml import etree as ET
+from collections import namedtuple
+
+from ear.fileio.bw64 import Bw64Reader
+
+
+
+
+

wavinfo/wave_bext_reader.py

@@ -1,58 +1,59 @@
 import struct
+from .umid_parser import UMIDParser
+
+from typing import Optional
 
 class WavBextReader:
     def __init__(self, bext_data, encoding):
-        # description[256]
+        """
-
+        Read Broadcast-WAV extended metadata.
-        # originator[32]
+        :param bext_data: The bytes-like data.
-        # originatorref[32]
+        :param encoding: The encoding to use when decoding the text fields of the
-        # originatordate[10]   "YYYY:MM:DD"
+                 BEXT metadata scope. According to EBU Rec 3285 this shall be ASCII.
-        # originatortime[8]    "HH:MM:SS"
+        """
-        # lowtimeref U32
-        # hightimeref U32
-        # version U16
-        #
-        # V1 field
-        # umid[64]
-        #
-        # V2 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 []
         packstring = "<256s" + "32s" + "32s" + "10s" + "8s" + "QH" + "64s" + "hhhhh" + "180s"
 
         rest_starts = struct.calcsize(packstring)
         unpacked = struct.unpack(packstring, bext_data[:rest_starts])
 
-        def sanatize_bytes(bytes):
+        def sanitize_bytes(b : bytes) -> str:
-            first_null = next( (index for index, byte in enumerate(bytes) if byte == 0 ), None )
+            first_null = next((index for index, byte in enumerate(b) if byte == 0), None)
-            if first_null is not None:
+            trimmed = b if first_null is None else b[:first_null]
-                trimmed = bytes[:first_null]
-            else:
-                trimmed = bytes
-
             decoded = trimmed.decode(encoding)
             return decoded
 
-        self.description     = sanatize_bytes(unpacked[0])
+        #: Description. A free-text field up to 256 characters long.
-        self.originator      = sanatize_bytes(unpacked[1])
+        self.description : str = sanitize_bytes(unpacked[0])
-        self.originator_ref  = sanatize_bytes(unpacked[2])
+        #: Originator. Usually the name of the encoding application, sometimes
-        self.originator_date = sanatize_bytes(unpacked[3])
+        #: a artist name.
-        self.originator_time = sanatize_bytes(unpacked[4])
+        self.originator : str = sanitize_bytes(unpacked[1])
-        self.time_reference  = unpacked[5]
+        #: A unique identifier for the file, a serial number.
-        self.version         = unpacked[6]
+        self.originator_ref : str = sanitize_bytes(unpacked[2])
-        self.umid            = None
+        #: Date of the recording, in the format YYY-MM-DD
-        self.loudness_value          = None
+        self.originator_date : str = sanitize_bytes(unpacked[3])
-        self.loudness_range          = None
+        #: Time of the recording, in the format HH:MM:SS.
-        self.max_true_peak           = None
+        self.originator_time : str = sanitize_bytes(unpacked[4])
-        self.max_momentary_loudness  = None
+        #: The sample offset of the start of the file relative to an
-        self.max_shortterm_loudness  = None
+        #: epoch, usually midnight the day of the recording. 
-        self.coding_history  = sanatize_bytes(bext_data[rest_starts:])
+        self.time_reference : int  = unpacked[5]
+        #: A variable-length text field containing a list of processes and
+        #: and conversions performed on the file.
+        self.coding_history : str = sanitize_bytes(bext_data[rest_starts:])
+        #: BEXT version. 
+        self.version : int = unpacked[6]
+        #: SMPTE 330M UMID of this audio file, 64 bytes are allocated though the UMID
+        #: may only be 32 bytes long.
+        self.umid : Optional[bytes] = None
+        #: EBU R128 Integrated loudness, in LUFS.
+        self.loudness_value : Optional[float] = None
+        #: EBU R128 Loudness rante, in LUFS.
+        self.loudness_range : Optional[float] = None
+        #: True peak level, in dBFS TP
+        self.max_true_peak : Optional[float] = None
+        #: EBU R128 Maximum momentary loudness, in LUFS
+        self.max_momentary_loudness : Optional[float] = None
+        #: EBU R128 Maximum short-term loudness, in LUFS.
+        self.max_shortterm_loudness : Optional[float] = None
 
         if self.version > 0:
             self.umid = unpacked[7]
@@ -64,8 +65,13 @@ class WavBextReader:
             self.max_momentary_loudness = unpacked[11] / 100.0
             self.max_shortterm_loudness = unpacked[12] / 100.0
 
-
     def to_dict(self):
+        if self.umid is not None:
+            umid_parsed = UMIDParser(self.umid)
+            umid_str = umid_parsed.basic_umid_to_str()
+        else:
+            umid_str = None
+
         return {'description': self.description,
                 'originator': self.originator,
                 'originator_ref': self.originator_ref,
@@ -73,6 +79,7 @@ class WavBextReader:
                 'originator_time': self.originator_time,
                 'time_reference': self.time_reference,
                 'version': self.version,
+                'umid': umid_str,
                 'coding_history': self.coding_history,
                 'loudness_value': self.loudness_value,
                 'loudness_range': self.loudness_range,
@@ -80,4 +87,3 @@ class WavBextReader:
                 'max_momentary_loudness': self.max_momentary_loudness,
                 'max_shortterm_loudness': self.max_shortterm_loudness
                 }
-

wavinfo/wave_info_reader.py

@@ -1,6 +1,7 @@
-
 from .riff_parser import parse_chunk, ListChunkDescriptor
 
+from typing import Optional
+
 class WavInfoChunkReader:
 
     def __init__(self, f, encoding):
@@ -9,30 +10,47 @@ class WavInfoChunkReader:
         f.seek(0)
         parsed_chunks = parse_chunk(f)
 
-        list_chunks = [chunk for chunk in parsed_chunks.children \
+        list_chunks = [chunk for chunk in parsed_chunks.children if type(chunk) is ListChunkDescriptor]
-                if type(chunk) is ListChunkDescriptor]
 
-        self.info_chunk  = next((chunk for chunk in list_chunks \
+        self.info_chunk = next((chunk for chunk in list_chunks if chunk.signature == b'INFO'), None)
-                if chunk.signature == b'INFO'), None)
 
-        self.copyright      = self._get_field(f,b'ICOP')
+        #: 'ICOP' Copyright
-        self.product        = self._get_field(f,b'IPRD')
+        self.copyright : Optional[str] = self._get_field(f, b'ICOP')
-        self.genre          = self._get_field(f,b'IGNR')
+        #: 'IPRD' Product
-        self.artist         = self._get_field(f,b'IART')
+        self.product : Optional[str]= self._get_field(f, b'IPRD')
-        self.comment        = self._get_field(f,b'ICMT')
+        self.album : Optional[str] = self.product
-        self.software       = self._get_field(f,b'ISFT')
+        #: 'IGNR' Genre
-        self.created_date   = self._get_field(f,b'ICRD')
+        self.genre : Optional[str] = self._get_field(f, b'IGNR')
-        self.engineer       = self._get_field(f,b'IENG')
+        #: 'ISBJ' Supject
-        self.keywords       = self._get_field(f,b'IKEY')
+        self.subject : Optional[str] = self._get_field(f, b'ISBJ')
-        self.title          = self._get_field(f,b'INAM')
+        #: 'IART' Artist, composer, author
-        self.source         = self._get_field(f,b'ISRC')
+        self.artist : Optional[str] = self._get_field(f, b'IART')
-        self.tape           = self._get_field(f,b'TAPE')
+        #: 'ICMT' Comment
+        self.comment : Optional[str] = self._get_field(f, b'ICMT')
+        #: 'ISFT' Software, encoding application
+        self.software : Optional[str] = self._get_field(f, b'ISFT')
+        #: 'ICRD' Created date
+        self.created_date : Optional[str] = self._get_field(f, b'ICRD')
+        #: 'IENG' Engineer
+        self.engineer : Optional[str] = self._get_field(f, b'IENG')
+        #: 'ITCH' Technician
+        self.technician : Optional[str] = self._get_field(f, b'ITCH')
+        #: 'IKEY' Keywords, keyword list
+        self.keywords : Optional[str] = self._get_field(f, b'IKEY')
+        #: 'INAM' Name, title
+        self.title : Optional[str] = self._get_field(f, b'INAM')
+        #: 'ISRC' Source
+        self.source : Optional[str] = self._get_field(f, b'ISRC')
+        #: 'TAPE' Tape
+        self.tape : Optional[str] = self._get_field(f, b'TAPE')
+        #: 'IARL' Archival Location
+        self.archival_location : Optional[str] = self._get_field(f, b'IARL')
+        #: 'ICSM' Commissioned
+        self.commissioned : Optional[str] = self._get_field(f, b'ICMS')
 
-
+    def _get_field(self, f, field_ident) -> Optional[str]:
-    def _get_field(self, f, field_ident):
+        search = next(((chunk.start, chunk.length) for chunk in self.info_chunk.children if chunk.ident == field_ident),
-
+                      None)
-        search = next( ( (chunk.start, chunk.length) for chunk in self.info_chunk.children \
-                if chunk.ident == field_ident ), None)
 
         if search is not None:
             f.seek(search[0])
@@ -41,10 +59,13 @@ class WavInfoChunkReader:
         else:
             return None
 
-
     def to_dict(self):
+        """
+        A dictionary with all of the key/values read from the INFO scope.
+        """
         return {'copyright': self.copyright,
                 'product': self.product,
+                'album': self.album,
                 'genre': self.genre,
                 'artist': self.artist,
                 'comment': self.comment,
@@ -54,11 +75,14 @@ class WavInfoChunkReader:
                 'keywords': self.keywords,
                 'title': self.title,
                 'source': self.source,
-                'tape':     self.tape
+                'tape': self.tape,
+                'commissioned': self.commissioned,
+                'archival_location': self.archival_location,
+                'subject': self.subject,
+                'technician': self.technician
                 }
 
-
+    def __repr__(self):
-
+        return_val = self.to_dict()
-
+        return_val.update({'encoding': self.encoding})
-
+        return str(return_val)
-

wavinfo/wave_ixml_reader.py

@@ -1,42 +1,91 @@
-import xml.etree.ElementTree as ET
+from lxml import etree as ET
 import io
+from collections import namedtuple
+from typing import Optional
+
+IXMLTrack = namedtuple('IXMLTrack', ['channel_index', 'interleave_index', 'name', 'function'])
+
 
 class WavIXMLFormat:
     """
-    iXML recorder metadata, as defined by iXML 2.0
+    iXML recorder metadata.
     """
     def __init__(self, xml):
+        """
+        Parse iXML.
+        :param xml: A bytes-like object containing the iXML payload.
+        """
         self.source = xml
-        xmlBytes = io.BytesIO(xml)
+        xml_bytes = io.BytesIO(xml)
-        self.parsed = ET.parse(xmlBytes)
+        parser = ET.XMLParser(recover=True)
+        self.parsed = ET.parse(xml_bytes, parser=parser)
 
-    def _get_text_value(self, xpath):
+    def _get_text_value(self, xpath) -> Optional[str]:
         e = self.parsed.find("./" + xpath)
         if e is not None:
             return e.text
+        else: 
+            return None
 
     @property
-    def project(self):
+    def raw_xml(self):
+        """
+        The root entity of the iXML document.
+        """
+        return self.parsed
+
+    @property
+    def track_list(self):
+        """
+        A description of each track.
+        :return: An Iterator
+        """
+        for track in self.parsed.find("./TRACK_LIST").iter():
+            if track.tag == 'TRACK':
+                yield IXMLTrack(channel_index=track.xpath('string(CHANNEL_INDEX/text())'),
+                                interleave_index=track.xpath('string(INTERLEAVE_INDEX/text())'),
+                                name=track.xpath('string(NAME/text())'),
+                                function=track.xpath('string(FUNCTION/text())'))
+
+    @property
+    def project(self) -> Optional[str]:
+        """
+        The project/film name entered for the recording.
+        """
         return self._get_text_value("PROJECT")
 
     @property
-    def scene(self):
+    def scene(self) -> Optional[str]:
+        """
+        Scene/slate.
+        """
         return self._get_text_value("SCENE")
 
     @property
-    def take(self):
+    def take(self) ->  Optional[str]:
+        """
+        Take number.
+        """
         return self._get_text_value("TAKE")
 
     @property
-    def tape(self):
+    def tape(self) -> Optional[str]:
+        """
+        Tape name.
+        """
         return self._get_text_value("TAPE")
 
     @property
-    def family_uid(self):
+    def family_uid(self) -> Optional[str]:
+        """
+        The globally-unique ID for this file family. This may be in the format
+        of a GUID, or an EBU Rec 9 source identifier, or some other dumb number.
+        """
         return self._get_text_value("FILE_SET/FAMILY_UID")
 
     @property
-    def family_name(self):
+    def family_name(self) -> Optional[str]:
+        """
+        The name of this file's file family.
+        """
         return self._get_text_value("FILE_SET/FAMILY_NAME")
-
-

wavinfo/wave_reader.py

@@ -1,8 +1,10 @@
 #-*- coding: utf-8 -*-
 import struct
-
+import os
 from collections import namedtuple
 
+import pathlib
+
 from .riff_parser import parse_chunk, ChunkDescriptor, ListChunkDescriptor
 from .wave_ixml_reader import WavIXMLFormat
 from .wave_bext_reader import WavBextReader
@@ -12,10 +14,11 @@ from .wave_info_reader import WavInfoChunkReader
 WavDataDescriptor = namedtuple('WavDataDescriptor', 'byte_count frame_count')
 
 #: The format of the audio samples.
-WavAudioFormat = namedtuple('WavAudioFormat','audio_format channel_count sample_rate byte_rate block_align bits_per_sample')
+WavAudioFormat = namedtuple('WavAudioFormat',
+                            'audio_format channel_count sample_rate byte_rate block_align bits_per_sample')
 
 
-class WavInfoReader():
+class WavInfoReader:
     """
     Parse a WAV audio file for metadata.
     """
@@ -24,58 +27,69 @@ class WavInfoReader():
         """
         Create a new reader object.
 
-        :param path: A filesystem path to the wav file you wish to probe.
+        :param path: 
+            A filesystem path to the wav file you wish to probe or a 
+            file handle to an open file.
 
-        :param info_encoding: The text encoding of the INFO metadata fields.
+        :param info_encoding: 
+            The text encoding of the INFO metadata fields.
             latin_1/Win CP1252 has always been a pretty good guess for this.
 
-        :param bext_encoding: The text encoding to use when decoding the string
+        :param bext_encoding: 
+            The text encoding to use when decoding the string
             fields of the Broadcast-WAV extension. Per EBU 3285 this is ASCII
-          but this parameter is available to you if you encounter a werido.
+            but this parameter is available to you if you encounter a weirdo.
-
         """
         
+        self.info_encoding = info_encoding
+        self.bext_encoding = bext_encoding
+        
+        if hasattr(path, 'read'):
+            self.get_wav_info(path)
+            self.url = 'about:blank'
+            self.path = repr(path)
+        else:
+            absolute_path = os.path.abspath(path)
+
+            #: `file://` url for the file.
+            self.url = pathlib.Path(absolute_path).as_uri()
+
+            # for __repr__()
+            self.path = absolute_path
+            
             with open(path, 'rb') as f:
-            chunks = parse_chunk(f)
+                self.get_wav_info(f)
+            
+    def get_wav_info(self, wavfile):
+        chunks = parse_chunk(wavfile)
 
         self.main_list = chunks.children
-            f.seek(0)
+        wavfile.seek(0)
 
         #: :class:`wavinfo.wave_reader.WavAudioFormat`
-            self.fmt    = self._get_format(f)
+        self.fmt = self._get_format(wavfile)
 
         #: :class:`wavinfo.wave_bext_reader.WavBextReader` with Broadcast-WAV metadata
-            self.bext   = self._get_bext(f, encoding=bext_encoding)
+        self.bext = self._get_bext(wavfile, encoding=self.bext_encoding)
 
         #: :class:`wavinfo.wave_ixml_reader.WavIXMLFormat` with iXML metadata
-            self.ixml   = self._get_ixml(f)
+        self.ixml = self._get_ixml(wavfile)
 
         #: :class:`wavinfo.wave_info_reader.WavInfoChunkReader` with RIFF INFO metadata
-            self.info   = self._get_info(f, encoding=info_encoding)
+        self.info = self._get_info(wavfile, encoding=self.info_encoding)
-            self.data   = self._describe_data(f)
+        self.data = self._describe_data()
 
     def _find_chunk_data(self, ident, from_stream, default_none=False):
-        chunk_descriptor = None
+        top_chunks = (chunk for chunk in self.main_list if type(chunk) is ChunkDescriptor and chunk.ident == ident)
-        top_chunks = (chunk for chunk in self.main_list if type(chunk) is ChunkDescriptor)
+        chunk_descriptor = next(top_chunks, None) if default_none else next(top_chunks)
+        return chunk_descriptor.read_data(from_stream) if chunk_descriptor else None
 
-        if default_none:
+    def _describe_data(self):
-            chunk_descriptor = next((chunk for chunk in top_chunks if chunk.ident == ident),None)
-        else:
-            chunk_descriptor = next((chunk for chunk in top_chunks if chunk.ident == ident))
-
-        if chunk_descriptor:
-            return chunk_descriptor.read_data(from_stream)
-        else:
-            return None
-
-
-    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=int(data_chunk.length / self.fmt.block_align))
 
-
     def _get_format(self, f):
         fmt_data = self._find_chunk_data(b'fmt ', f)
 
@@ -107,38 +121,43 @@ class WavInfoReader():
                               )
 
     def _get_info(self, f, encoding):
-        finder = (chunk.signature for chunk in self.main_list \
+        finder = (chunk.signature for chunk in self.main_list if type(chunk) is ListChunkDescriptor)
-                if type(chunk) is ListChunkDescriptor)
 
         if b'INFO' in finder:
             return WavInfoChunkReader(f, encoding)
 
     def _get_bext(self, f, encoding):
         bext_data = self._find_chunk_data(b'bext', f, default_none=True)
-        if bext_data:
+        return WavBextReader(bext_data, encoding) if bext_data else None
-            return WavBextReader(bext_data, encoding)
-        else:
-            return None
 
     def _get_ixml(self, f):
         ixml_data = self._find_chunk_data(b'iXML', f, default_none=True)
-        if ixml_data is None:
+        return None if ixml_data is None else WavIXMLFormat(ixml_data.rstrip(b'\0'))
-            return None
-
-        ixml_string = ixml_data
-        return WavIXMLFormat(ixml_string)
 
     def walk(self):
         """
         Walk all of the available metadata fields.
 
         :yields: a string, the :scope: of the metadatum, the string :name: of the
-        metadata field, and the value
+        metadata field, and the value.
         """
 
-        scopes = ('fmt','data')#,'bext','ixml','info')
+        scopes = ('fmt', 'data')  # 'bext', 'ixml', 'info')
 
         for scope in scopes:
             attr = self.__getattribute__(scope)
             for field in attr._fields:
                 yield scope, field, attr.__getattribute__(field)
+
+            if self.bext is not None:
+                bext_dict = (self.bext or {}).to_dict()
+                for key in bext_dict.keys():
+                    yield 'bext', key, bext_dict[key]
+
+            if self.info is not None:
+                info_dict = self.info.to_dict()
+                for key in info_dict.keys():
+                    yield 'info', key, info_dict[key]
+
+    def __repr__(self):
+        return 'WavInfoReader({}, {}, {})'.format(self.path, self.info_encoding, self.bext_encoding)