Version 1.1

Parsing this new file from soundgrinder seems to be error-prone, for now this fixes it.

.travis.yml

@@ -1,13 +1,20 @@
+dist: xenial
 language: python
 python:
     - "3.6"
     - "3.5"
-    - "3.4"
-    - "3.3"
-    - "3.2"
-    - "3.1"
-    - "3.0"
 script:
-    - "python3 setup.py test"
+    - "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:
-    - "pip3 install setuptools"
+    - "pip install setuptools"
+after_success:
+    - coveralls

README.md

@@ -1,4 +1,5 @@
 [![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)
 
 
@@ -10,30 +11,29 @@ production metadata.
 
 `wavinfo` reads:
 
-* __Broadcast-WAVE__ metadata, compliant with [EBU Tech 3285v2 (2011)][ebu], including embedded program loudness and coding history, if extant.
-* [__iXML__ production recorder metadata][ixml], including project, scene, and take tags, recorder notes and file family information.
-* The __wav format__ is also parsed, so you can access the basic sample rate and channel count information.
+* __Broadcast-WAVE__ metadata, compliant with [EBU Tech 3285v2 (2011)][ebu], including embedded program 
+  loudness and coding history, if extant. This also includes the [SMPTE 330M __UMID__][smpte_330m2011] 
+  Unique Materials Identifier.
+* [__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.
+* The __wav format__ is also parsed, so you can access the basic sample rate and channel count 
+  information.
 
 In progress:
-* [SMPTE 330M __UMID__][smpte_330m2011] Unique Materials Identifier.
 * iXML `STEINBERG` sound library attributes.
-* Most of the common __RIFF INFO__ metadata fields.
 * Pro Tools __embedded regions__.
 
-This module is presently under construction and not sutiable for production at this time.
-
 [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.infoi
+[ixml]:http://www.ixml.info
 
 
 
 ## Demonstration
 
-
 The entry point for wavinfo is the WavInfoReader class.
 
-
 ```python
 from wavinfo import WavInfoReader
 
@@ -44,10 +44,8 @@ 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)
@@ -55,9 +53,27 @@ The length of the file in frames (interleaved samples) and bytes is available, a
 >>> (48000, 2, 6, 24)
 ```
 
-## Broadcast WAV Extension
+### Broadcast WAV Extension
 
+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)
@@ -92,8 +108,17 @@ print(info.bext.coding_history)
 
 
 
-## iXML Production Recorder Metadata
+### 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)
@@ -110,6 +135,22 @@ print("iXML File Family UID:", info.ixml.family_uid)
     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)
 
 

demo.md

@@ -1,104 +0,0 @@
-
-# `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
-
-```

docs/Makefile

@@ -0,0 +1,19 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+SOURCEDIR     = .
+BUILDDIR      = _build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

docs/conf.py

@@ -0,0 +1,184 @@
+# -*- coding: utf-8 -*-
+#
+# Configuration file for the Sphinx documentation builder.
+#
+# This file does only contain a selection of the most common options. For a
+# full list see the documentation:
+# http://www.sphinx-doc.org/en/master/config
+
+# -- Path setup --------------------------------------------------------------
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+import os
+import sys
+sys.path.insert(0, os.path.abspath('..'))
+
+
+# -- Project information -----------------------------------------------------
+
+project = u'wavinfo'
+copyright = u'2019, 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'
+
+
+# -- General configuration ---------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    'sphinx.ext.autodoc',
+    'sphinx.ext.todo',
+    'sphinx.ext.coverage',
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The master toctree document.
+master_doc = 'index'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# 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
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = [u'_build', 'Thumbs.db', '.DS_Store']
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = None
+
+
+# -- Options for HTML output -------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_rtd_theme'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#
+# html_theme_options = {}
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# Custom sidebar templates, must be a dictionary that maps document names
+# to template names.
+#
+# The default sidebars (for documents that don't match any pattern) are
+# defined by theme itself.  Builtin themes are using these templates by
+# default: ``['localtoc.html', 'relations.html', 'sourcelink.html',
+# 'searchbox.html']``.
+#
+# html_sidebars = {}
+
+
+# -- Options for HTMLHelp output ---------------------------------------------
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'wavinfodoc'
+
+
+# -- Options for LaTeX output ------------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    #
+    # 'papersize': 'letterpaper',
+
+    # The font size ('10pt', '11pt' or '12pt').
+    #
+    # 'pointsize': '10pt',
+
+    # Additional stuff for the LaTeX preamble.
+    #
+    # 'preamble': '',
+
+    # Latex figure (float) alignment
+    #
+    # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    (master_doc, 'wavinfo.tex', u'wavinfo Documentation',
+     u'Jamie Hardt', 'manual'),
+]
+
+
+# -- Options for manual page output ------------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'wavinfo', u'wavinfo Documentation',
+     [author], 1)
+]
+
+
+# -- Options for Texinfo output ----------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    (master_doc, 'wavinfo', u'wavinfo Documentation',
+     author, 'wavinfo', 'One line description of project.',
+     'Miscellaneous'),
+]
+
+
+# -- Options for Epub output -------------------------------------------------
+
+# Bibliographic Dublin Core info.
+epub_title = project
+
+# The unique identifier of the text. This can be a ISBN number
+# or the project homepage.
+#
+# epub_identifier = ''
+
+# A unique identification for the text.
+#
+# epub_uid = ''
+
+# A list of files that should not be packed into the epub file.
+epub_exclude_files = ['search.html']
+
+
+# -- Extension configuration -------------------------------------------------
+
+# -- Options for todo extension ----------------------------------------------
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = True

docs/index.rst

@@ -0,0 +1,32 @@
+.. wavinfo documentation master file, created by
+   sphinx-quickstart on Thu Jan  3 17:09:28 2019.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Welcome to wavinfo's documentation!
+===================================
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+.. module:: wavinfo
+
+.. autoclass:: WavInfoReader
+   :members:
+
+   .. automethod:: __init__
+   
+
+.. autoclass:: wavinfo.wave_reader.WavAudioFormat
+   :members:
+
+.. autoclass:: wavinfo.wave_reader.WavDataDescriptor
+   :members:
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`

docs/make.bat

@@ -0,0 +1,35 @@
+@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

examples/demo.ipynb

@@ -11,13 +11,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [],
    "source": [
     "from wavinfo import WavInfoReader\n",
     "\n",
-    "path = '../tests/test_files/A101_1.WAV'\n",
+    "path = '../tests/test_files/sounddevices/A101_1.WAV'\n",
     "\n",
     "info = WavInfoReader(path)"
    ]
@@ -33,7 +33,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [
     {
@@ -42,7 +42,7 @@
        "(240239, 1441434)"
       ]
      },
-     "execution_count": 4,
+     "execution_count": 2,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -53,7 +53,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 3,
    "metadata": {},
    "outputs": [
     {
@@ -62,7 +62,7 @@
        "(48000, 2, 6, 24)"
       ]
      },
-     "execution_count": 7,
+     "execution_count": 3,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -80,7 +80,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [
     {
@@ -130,7 +130,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
@@ -142,9 +142,7 @@
       "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"
+      "iXML File Family UID: USSDVGR1112089007124001008206300\n"
      ]
     }
    ],
@@ -157,6 +155,13 @@
     "print(\"iXML File Family UID:\", info.ixml.family_uid)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
   {
    "cell_type": "code",
    "execution_count": null,

examples/wavinfo.ipynb

@@ -25,86 +25,17 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "testfile_path = \"../tests/test_files/\"\n",
-    "sound_devices_file = testfile_path + \"A101_1.WAV\"\n",
+    "path = '../tests/test_files/protools/PT A101_4.A1.wav'\n",
     "\n",
-    "info = wavinfo.WavInfoReader(sound_devices_file)"
+    "info = wavinfo.WavInfoReader(path)"
    ]
   },
   {
    "cell_type": "code",
    "execution_count": 4,
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "WavInfoFormat(audio_format=1, channel_count=2, sample_rate=48000, byte_rate=288000, block_align=6, bits_per_sample=24)\n"
-     ]
-    }
-   ],
-   "source": [
-    "pp.pprint(info.fmt)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 5,
-   "metadata": {},
-   "outputs": [
-    {
-     "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=0.0, 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"
-     ]
-    }
-   ],
-   "source": [
-    "pp.pprint(info.bext)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 6,
-   "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "('BMH', 'A101', '1', 240239)"
-      ]
-     },
-     "execution_count": 6,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "info.ixml.project, info.ixml.scene, info.ixml.take, info.data.frame_count"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": []
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 7,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "pro_tools_file = testfile_path + \"PT A101_4.A1.wav\""
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 8,
-   "metadata": {},
+   "metadata": {
+    "scrolled": true
+   },
    "outputs": [
     {
      "name": "stdout",
@@ -123,7 +54,7 @@
    "source": [
     "import wavinfo.wave_parser\n",
     "\n",
-    "with open(pro_tools_file,'rb') as f:\n",
+    "with open(path,'rb') as f:\n",
     "    chunk_tree = wavinfo.wave_parser.parse_chunk(f)\n",
     "\n",
     "pp.pprint(chunk_tree.children)"
@@ -131,75 +62,127 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
      "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=0.0, 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"
+      "b'\\x00\\x00\\x00\\x00\\x00\\x00\\x00*\\xfd\\xf5\\x0c$\\xe4s\\x80\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00'\n",
+      "000000000000002afdf50c24e47380000000000000000000\n",
+      "24\n"
      ]
     }
    ],
    "source": [
-    "ptinfo = wavinfo.WavInfoReader(pro_tools_file)\n",
-    "\n",
-    "print(ptinfo.bext)"
+    "with open(path,'rb') as f:\n",
+    "    f.seek( chunk_tree.children[4].start )\n",
+    "    umid_bin = f.read(chunk_tree.children[4].length)\n",
+    "    f.seek( chunk_tree.children[6].start )\n",
+    "    regn_bin = f.read(chunk_tree.children[6].length)\n",
+    "    \n",
+    "print(umid_bin)\n",
+    "print(umid_bin.hex())\n",
+    "print(len(umid_bin))"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
-   "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "'<BWFXML><IXML_VERSION>1.61</IXML_VERSION><STEINBERG><ATTR_LIST><ATTR><TYPE>string</TYPE><NAME>MediaLibrary</NAME><VALUE>The Recordist Christmas 2018</VALUE></ATTR><ATTR><TYPE>string</TYPE><NAME>MediaCategoryPost</NAME><VALUE>Bullets</VALUE></ATTR><ATTR><TYPE>string</TYPE><NAME>MediaLibraryManufacturerName</NAME><VALUE>Creative Sound Design, LLC</VALUE></ATTR><ATTR><TYPE>string</TYPE><NAME>AudioSoundEditor</NAME><VALUE>Frank Bry</VALUE></ATTR><ATTR><TYPE>string</TYPE><NAME>MediaComment</NAME><VALUE>BULLET Impact Plastic LCD TV Screen Shatter Debris 2x</VALUE></ATTR><ATTR><TYPE>string</TYPE><NAME>MusicalCategory</NAME><VALUE>Bullets</VALUE></ATTR></ATTR_LIST></STEINBERG></BWFXML>'"
-      ]
-     },
-     "execution_count": 10,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "library_sound = testfile_path + 'BULLET Impact Plastic LCD TV Screen Shatter Debris 2x.wav'\n",
-    "\n",
-    "recinfo = wavinfo.WavInfoReader(library_sound)\n",
-    "\n",
-    "recinfo.ixml.source"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "[   ChunkDescriptor(ident=b'fmt ', start=20, length=40),\n",
-      "    ChunkDescriptor(ident=b'bext', start=68, length=604),\n",
-      "    ChunkDescriptor(ident=b'data', start=680, length=2833404),\n",
-      "    ChunkDescriptor(ident=b'ID3 ', start=2834092, length=2048),\n",
-      "    ChunkDescriptor(ident=b'SMED', start=2836148, length=5468),\n",
-      "    ListChunkDescriptor(signature=b'INFO', children=[ChunkDescriptor(ident=b'IPRD', start=2841636, length=30), ChunkDescriptor(ident=b'IGNR', start=2841674, length=8), ChunkDescriptor(ident=b'IART', start=2841690, length=10), ChunkDescriptor(ident=b'ICMT', start=2841708, length=54), ChunkDescriptor(ident=b'ICOP', start=2841770, length=84), ChunkDescriptor(ident=b'ISFT', start=2841862, length=12), ChunkDescriptor(ident=b'ICRD', start=2841882, length=12)]),\n",
-      "    ChunkDescriptor(ident=b'iXML', start=2841902, length=686),\n",
-      "    ChunkDescriptor(ident=b'umid', start=2842596, length=24),\n",
-      "    ChunkDescriptor(ident=b'_PMX', start=2842628, length=3560)]\n"
+      "<wavinfo.wave_bext_reader.WavBextReader object at 0x10d5f8ac8>\n"
      ]
     }
    ],
    "source": [
-    "with open(library_sound,'rb') as f:\n",
+    "print(info.bext)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "b'\\x01\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00*\\xfd\\xf5\\x0c$\\xe4s\\x80\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x0c3\\x02\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00T\\xd5\\xa2\\x82\\x00\\x00\\x00\\x00\\x10PT A101_4.A1.wavGK\\xaa\\xaf\\x7f\\x00\\x00@ }\\x06\\x00`\\x00\\x00'\n",
+      "01000000000000000000002afdf50c24e473800000000000000000000c330200000000000000000000000000000000000000000054d5a2820000000010505420413130315f342e41312e776176474baaaf7f000040207d0600600000\n",
+      "92\n"
+     ]
+    }
+   ],
+   "source": [
+    "\n",
+    "print(regn_bin)\n",
+    "print(regn_bin.hex())\n",
+    "print(len(regn_bin))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{   'artist': 'Frank Bry',\n",
+      "    'comment': 'BULLET Impact Plastic LCD TV Screen Shatter Debris 2x',\n",
+      "    'copyright': '2018 Creative Sound Design, LLC (The Recordist Christmas '\n",
+      "                 '2018) www.therecordist.com',\n",
+      "    'created_date': '2018-11-15',\n",
+      "    'engineer': None,\n",
+      "    'genre': 'Bullets',\n",
+      "    'keywords': None,\n",
+      "    'product': 'The Recordist Christmas 2018',\n",
+      "    'software': 'Soundminer',\n",
+      "    'source': None,\n",
+      "    'tape': None,\n",
+      "    'title': None}\n",
+      "{   'coding_history': '',\n",
+      "    'description': 'BULLET Impact Plastic LCD TV Screen Shatter Debris 2x',\n",
+      "    'loudness_range': None,\n",
+      "    'loudness_value': None,\n",
+      "    'max_momentary_loudness': None,\n",
+      "    'max_shortterm_loudness': None,\n",
+      "    'max_true_peak': None,\n",
+      "    'originator': 'TheRecordist',\n",
+      "    'originator_date': '2018-12-20',\n",
+      "    'originator_ref': 'aaiAKt3fCGTk',\n",
+      "    'originator_time': '12:15:37',\n",
+      "    'time_reference': 57882,\n",
+      "    'version': 0}\n"
+     ]
+    }
+   ],
+   "source": [
+    "path = '../tests/test_files/BULLET Impact Plastic LCD TV Screen Shatter Debris 2x.wav'\n",
+    "\n",
+    "info = wavinfo.WavInfoReader(path)\n",
+    "\n",
+    "with open(path,'rb') as f:\n",
     "    chunk_tree = wavinfo.wave_parser.parse_chunk(f)\n",
-    "\n",
-    "pp.pprint(chunk_tree.children)"
+    "    \n",
+    "pp.pprint(info.info.to_dict())\n",
+    "pp.pprint(info.bext.to_dict())"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
   {
    "cell_type": "code",
    "execution_count": null,

pypi_upload.sh

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

setup.py

@@ -4,15 +4,17 @@ with open("README.md", "r") as fh:
     long_description = fh.read()
 
 setup(name='wavinfo',
-      version='0.1',
+      version='1.1',
       author='Jamie Hardt',
       author_email='jamiehardt@me.com',
       description='WAVE sound file metadata parser.',
       long_description_content_type="text/markdown",
       long_description=long_description,
       url='https://github.com/iluvcapra/wavinfo',
-      classifiers=['Development Status :: 2 - Pre-Alpha',
+      classifiers=['Development Status :: 5 - Production/Stable',
           'License :: OSI Approved :: MIT License',
           'Topic :: Multimedia',
-	  'Topic :: Multimedia :: Sound/Audio'],
+	  'Topic :: Multimedia :: Sound/Audio',
+          "Programming Language :: Python :: 3.5",
+          "Programming Language :: Python :: 3.6"],
       packages=['wavinfo'])

tests/test_files/WaveAgentSoundReport.csv

@@ -1 +1 @@
-SOUND REPORT
+SOUND REPORT

tests/test_wave_parsing.py

@@ -1,22 +1,24 @@
 import os.path
 import json
 import subprocess
+from subprocess import PIPE
 
 from unittest import TestCase
 
 import wavinfo
 
-FFPROBE='/usr/local/bin/ffprobe'
+FFPROBE='ffprobe'
 
 
 def ffprobe(path):
 
     arguments = [ FFPROBE , "-of", "json" , "-show_format", "-show_streams", path ]
 
-    process = subprocess.run(arguments, stdin=None, capture_output=True)
+    process = subprocess.run(arguments, stdin=None, stdout=PIPE, stderr=PIPE)
 
     if process.returncode == 0:
-        return json.loads(process.stdout)
+        output_str = process.stdout.decode('utf-8')
+        return json.loads(output_str)
     else:
         return None
 
@@ -28,7 +30,7 @@ class TestWaveInfo(TestCase):
         for dirpath, dirnames, filenames in os.walk('tests/test_files'):
             for filename in filenames:
                 name, ext = os.path.splitext(filename)
-                if ext == '.wav':
+                if ext in ['.wav','.WAV']:
                     yield os.path.join(dirpath, filename)
 
 
@@ -64,16 +66,23 @@ class TestWaveInfo(TestCase):
         for wav_file in self.all_files():
             info = wavinfo.WavInfoReader(wav_file)
             ffprobe_info = ffprobe(wav_file)
+            if info.bext:
+                self.assertEqual( info.bext.description, ffprobe_info['format']['tags']['comment']  )
+                self.assertEqual( info.bext.originator, ffprobe_info['format']['tags']['encoded_by']  )
+                if 'originator_reference' in ffprobe_info['format']['tags']:
+                    self.assertEqual( info.bext.originator_ref, ffprobe_info['format']['tags']['originator_reference']  )
+                else:
+                    self.assertEqual( info.bext.originator_ref, '')
 
-            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'])  )
 
-            # 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']  )
+                if 'coding_history' in ffprobe_info['format']['tags']:
+                    self.assertEqual( info.bext.coding_history, ffprobe_info['format']['tags']['coding_history']  )
+                else:
+                    self.assertEqual( info.bext.coding_history, '' )
 
     def test_ixml(self):
         expected = {'A101_4.WAV': {'project' : 'BMH', 'scene': 'A101', 'take': '4',

wavinfo/__init__.py

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

wavinfo/riff_parser.py

@@ -1,32 +1,47 @@
 
 import struct
-
+import pdb
 from collections import namedtuple
 
-ListChunkDescriptor = namedtuple('ListChunkDescriptor' , 'signature children')
+class ListChunkDescriptor(namedtuple('ListChunkDescriptor' , 'signature children')):
+
+    def find(chunk_path):
+        if len(chunk_path) > 1:
+            for chunk in self.children:
+                if type(chunk) is ListChunkDescriptor and \
+                        chunk.signature is chunk_path[0]:
+                            return chunk.find(chunk_path[1:])
+        else:
+            for chunk in self.children:
+                if type(chunk) is ChunkDescriptor and \
+                        chunk.ident is chunk_path[0]:
+                            return chunk
+
 
 class ChunkDescriptor(namedtuple('ChunkDescriptor', 'ident start length') ):
     def read_data(self, from_stream):
         from_stream.seek(self.start)
         return from_stream.read(self.length)
 
-
 def parse_list_chunk(stream, length):
-    children = []
-
     start = stream.tell()
 
     signature = stream.read(4)
 
+    children = []
     while (stream.tell() - start) < length:
-        children.append(parse_chunk(stream))
+        child_chunk = parse_chunk(stream)
+        if child_chunk:
+             children.append(child_chunk)
+        else: 
+             break
 
     return ListChunkDescriptor(signature=signature, children=children)
 
-
 def parse_chunk(stream):
+    #breakpoint()
     ident = stream.read(4)
-    if len(ident) != 4: 
+    if len(ident) != 4:
         return
 
     sizeb = stream.read(4)
@@ -47,11 +62,3 @@ def parse_chunk(stream):
 
 
 
-
-
-
-        
-
-
-
-

wavinfo/wave_bext_reader.py

@@ -0,0 +1,83 @@
+import struct
+
+class WavBextReader:
+    def __init__(self,bext_data,encoding):
+        # description[256]
+
+        # originator[32]
+        # originatorref[32]
+        # originatordate[10]   "YYYY:MM:DD"
+        # 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):
+            first_null = next( (index for index, byte in enumerate(bytes) if byte == 0 ), None )
+            if first_null is not None:
+                trimmed = bytes[:first_null]
+            else:
+                trimmed = bytes
+
+            decoded = trimmed.decode(encoding)
+            return decoded
+
+        self.description     = sanatize_bytes(unpacked[0])
+        self.originator      = sanatize_bytes(unpacked[1])
+        self.originator_ref  = sanatize_bytes(unpacked[2])
+        self.originator_date = sanatize_bytes(unpacked[3])
+        self.originator_time = sanatize_bytes(unpacked[4])
+        self.time_reference  = unpacked[5]
+        self.version         = unpacked[6]
+        self.umid            = None
+        self.loudness_value          = None
+        self.loudness_range          = None
+        self.max_true_peak           = None
+        self.max_momentary_loudness  = None
+        self.max_shortterm_loudness  = None
+        self.coding_history  = sanatize_bytes(bext_data[rest_starts:])
+
+        if self.version > 0:
+            self.umid = unpacked[7]
+
+        if self.version > 1:
+            self.loudness_value          = unpacked[8] / 100.0
+            self.loudness_range          = unpacked[9] / 100.0
+            self.max_true_peak           = unpacked[10] / 100.0
+            self.max_momentary_loudness  = unpacked[11] / 100.0
+            self.max_shortterm_loudness  = unpacked[12] / 100.0
+
+
+    def to_dict(self):
+        return {'description':      self.description,
+                'originator':       self.originator,
+                'originator_ref':   self.originator_ref,
+                'originator_date':  self.originator_date,
+                'originator_time':  self.originator_time,
+                'time_reference':   self.time_reference,
+                'version':          self.version,
+                'coding_history':   self.coding_history,
+                'loudness_value':   self.loudness_value,
+                'loudness_range':   self.loudness_range,
+                'max_true_peak':    self.max_true_peak,
+                'max_momentary_loudness':   self.max_momentary_loudness,
+                'max_shortterm_loudness':   self.max_shortterm_loudness
+                }
+

wavinfo/wave_info_reader.py

@@ -0,0 +1,64 @@
+
+from .riff_parser import parse_chunk, ListChunkDescriptor
+
+class WavInfoChunkReader:
+
+    def __init__(self, f, encoding):
+        self.encoding = encoding
+
+        f.seek(0)
+        parsed_chunks = parse_chunk(f)
+
+        list_chunks = [chunk for chunk in parsed_chunks.children \
+                if type(chunk) is ListChunkDescriptor]
+
+        self.info_chunk  = next((chunk for chunk in list_chunks \
+                if chunk.signature == b'INFO'), None)
+
+        self.copyright      = self._get_field(f,b'ICOP')
+        self.product        = self._get_field(f,b'IPRD')
+        self.genre          = self._get_field(f,b'IGNR')
+        self.artist         = self._get_field(f,b'IART')
+        self.comment        = self._get_field(f,b'ICMT')
+        self.software       = self._get_field(f,b'ISFT')
+        self.created_date   = self._get_field(f,b'ICRD')
+        self.engineer       = self._get_field(f,b'IENG')
+        self.keywords       = self._get_field(f,b'IKEY')
+        self.title          = self._get_field(f,b'INAM')
+        self.source         = self._get_field(f,b'ISRC')
+        self.tape           = self._get_field(f,b'TAPE')
+
+
+    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)
+
+        if search is not None:
+            f.seek(search[0])
+            data = f.read(search[1])
+            return data.decode(self.encoding).rstrip('\0')
+        else:
+            return None
+
+
+    def to_dict(self):
+        return {'copyright':    self.copyright,
+                'product':  self.product,
+                'genre':    self.genre,
+                'artist':   self.artist,
+                'comment':  self.comment,
+                'software': self.software,
+                'created_date': self.created_date,
+                'engineer': self.engineer,
+                'keywords': self.keywords,
+                'title':    self.title,
+                'source':   self.source,
+                'tape':     self.tape
+                }
+
+
+
+
+
+

wavinfo/wave_ixml_reader.py

@@ -1,4 +1,5 @@
 import xml.etree.ElementTree as ET
+import io
 
 class WavIXMLFormat:
     """
@@ -6,17 +7,18 @@ class WavIXMLFormat:
     """
     def __init__(self, xml):
         self.source = xml
-        self.parsed = ET.fromstring(xml)
+        xmlBytes = io.BytesIO(xml)
+        self.parsed = ET.parse(xmlBytes)
 
     def _get_text_value(self, xpath):
         e = self.parsed.find("./" + xpath)
         if e is not None:
             return e.text
-    
+
     @property
     def project(self):
         return self._get_text_value("PROJECT")
-        
+
     @property
     def scene(self):
         return self._get_text_value("SCENE")

wavinfo/wave_reader.py

@@ -1,38 +1,57 @@
+#-*- coding: utf-8 -*-
 import struct
 
 from collections import namedtuple
 
-from .wave_parser import parse_chunk, ChunkDescriptor, ListChunkDescriptor
+from .riff_parser import parse_chunk, ChunkDescriptor, ListChunkDescriptor
 from .wave_ixml_reader import WavIXMLFormat
+from .wave_bext_reader import WavBextReader
+from .wave_info_reader import WavInfoChunkReader
 
+#: Calculated statistics about the audio data.
 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 ' +
-    'originator_date originator_time time_reference version umid ' +
-    'loudness_value loudness_range max_true_peak max_momentary_loudness max_shortterm_loudness ' +
-    'coding_history')
+#: The format of the audio samples.
+WavAudioFormat = namedtuple('WavAudioFormat','audio_format channel_count sample_rate byte_rate block_align bits_per_sample')
 
 
 class WavInfoReader():
     """
-    format : WAV format
-    bext   : The Broadcast-WAV extension as definied by EBU Tech 3285 v2 (2011)
-
+    Parse a WAV audio file for metadata.
     """
 
-    def __init__(self, path):
+    def __init__(self, path, info_encoding='latin_1', bext_encoding='ascii'):
+        """
+        Create a new reader object.
+
+        :param path: A filesystem path to the wav file you wish to probe.
+
+        :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
+          fields of the Broadcast-WAV extension. Per EBU 3285 this is ASCII
+          but this parameter is available to you if you encounter a werido.
+
+        """
+
         with open(path, 'rb') as f:
             chunks = parse_chunk(f)
 
             self.main_list = chunks.children
             f.seek(0)
 
+            #: :class:`wavinfo.wave_reader.WavAudioFormat`
             self.fmt    = self._get_format(f)
-            self.bext   = self._get_bext(f)
+
+            #: :class:`wavinfo.wave_bext_reader.WavBextReader` with Broadcast-WAV metadata
+            self.bext   = self._get_bext(f, encoding=bext_encoding)
+
+            #: :class:`wavinfo.wave_ixml_reader.WavIXMLFormat` with iXML metadata
             self.ixml   = self._get_ixml(f)
 
+            #: :class:`wavinfo.wave_info_reader.WavInfoChunkReader` with RIFF INFO metadata
+            self.info   = self._get_info(f, encoding=info_encoding)
             self.data   = self._describe_data(f)
 
     def _find_chunk_data(self, ident, from_stream, default_none=False):
@@ -57,7 +76,6 @@ class WavInfoReader():
                 frame_count= int(data_chunk.length / self.fmt.block_align))
 
 
-
     def _get_format(self,f):
         fmt_data = self._find_chunk_data(b'fmt ',f)
 
@@ -78,71 +96,49 @@ class WavInfoReader():
         #0x0006	WAVE_FORMAT_ALAW	8-bit ITU-T G.711 A-law
         #0x0007	WAVE_FORMAT_MULAW	8-bit ITU-T G.711 µ-law
         #0xFFFE	WAVE_FORMAT_EXTENSIBLE	Determined by SubFormat
-        if unpacked[0] == 0x0001:
-            return WavInfoFormat(audio_format = unpacked[0],
-                    channel_count = unpacked[1],
-                    sample_rate   = unpacked[2],
-                    byte_rate     = unpacked[3],
-                    block_align   = unpacked[4],
+
+        #https://sno.phy.queensu.ca/~phil/exiftool/TagNames/RIFF.html
+        return WavAudioFormat(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,f):
+    def _get_info(self, f, encoding):
+        finder = (chunk.signature for chunk in self.main_list \
+                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)
-
-        # 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 []
-        if bext_data is None:
+        if bext_data:
+            return WavBextReader(bext_data, encoding)
+        else:
             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'),
-                originator_date = unpacked[3].decode('ascii'),
-                originator_time = unpacked[4].decode('ascii'),
-                time_reference  = unpacked[5],
-                version         = unpacked[6],
-                umid            = unpacked[7],
-                loudness_value  = unpacked[8] / 100.0,
-                loudness_range  = unpacked[9] / 100.0,
-                max_true_peak   = unpacked[10] / 100.0,
-                max_momentary_loudness = unpacked[11] / 100.0,
-                max_shortterm_loudness = unpacked[12] / 100.0,
-                coding_history = bext_data[rest_starts:].decode('ascii').rstrip('\0')
-                )
-
     def _get_ixml(self,f):
-
         ixml_data = self._find_chunk_data(b'iXML',f,default_none=True)
         if ixml_data is None:
             return None
 
-        ixml_string = ixml_data.decode('utf-8')
+        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
+        """
 
+        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)