Changed indexing of tracks

Removed supplemental metadata for
now

CONTRIBUTING.md

@@ -0,0 +1,15 @@
+# Contributing
+
+Contributions to this project are very welcome!
+
+If you discover a bug or would like better support for a feature, please do the following:
+
+1. Submit an Issue.
+
+   I'm actively developing this project and will review incoming issues.
+1. Check out the source code and submit a PR.
+   
+   If you're facile with Python and understand what you'd like to fix, submit a PR and I'll 
+   review it as soon as I can. There's a `.devcontainer` available so you can creates commits 
+   on this project in a GitHub codespace.
+   

README.md

@@ -11,8 +11,9 @@ The `wavinfo` package allows you to probe WAVE and [RF64/WAVE files][eburf64] an
 `wavinfo` reads:
 
 * [__Broadcast-WAVE__][ebu] metadata, including embedded program
-  loudness and coding history and [__SMPTE UMID__][smpte_330m2011].
-* [__ADM__][adm] track metadata, including channel, pack formats, object and content names.
+  loudness, coding history and [__SMPTE UMID__][smpte_330m2011].
+* [__ADM__][adm] track metadata and schema, including channel, pack formats, object, content and programme.
+* [__Dolby Digital Plus__][ebu3285s6] and Dolby Atmos `dbmd` metadata.
 * [__iXML__][ixml] production recorder metadata, including project, scene, and take tags, recorder notes
   and file family information.
 * Most of the common [__RIFF INFO__][info-tags] metadata fields.
@@ -20,11 +21,9 @@ The `wavinfo` package allows you to probe WAVE and [RF64/WAVE files][eburf64] an
   information.
 
 In progress:
-* [__Dolby RMU__][dolby] metadata and [EBU Tech 3285 Supplement 6][ebu3285s6].
 * Pro Tools __embedded regions__.
 * iXML `STEINBERG` sound library attributes.
 
-[dolby]:https://developer.dolby.com/globalassets/documentation/technology/dolby_atmos_master_adm_profile_v1.0.pdf
 [ebu]:https://tech.ebu.ch/docs/tech/tech3285.pdf
 [ebu3285s6]:https://tech.ebu.ch/docs/tech/tech3285s6.pdf
 [adm]:https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.2076-2-201910-I!!PDF-E.pdf

docs/source/classes.rst

@@ -1,18 +1,10 @@
 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/command_line.rst

@@ -0,0 +1,94 @@
+Using `wavinfo` from the Command Line
+=====================================
+
+`wavinfo` installs a command-line entry point that will read wav files
+from the command line and output metadata to stdout.
+
+.. code-block:: shell
+
+    $ wavinfo [--ixml | --adm] INFILE +
+
+By default, `wavinfo` will output a JSON dictionary for each file argument.
+
+
+Options
+-------
+
+Two option flags will change the behavior of the command:
+
+``--ixml``
+    The *\-\-ixml* flag will cause `wavinfo` to output the iXML metadata payload
+    of each input wave file, or will emit an error message to stderr if iXML 
+    metadata is not present.
+
+``--adm``
+    The *\-\-adm* flag will cause `wavinfo` to output the ADM XML metadata 
+    payload of each input wave file, or will emit an error message to stderr if
+    ADM XML metadata is not present.
+
+These options are mutually-exclusive, with `\-\-adm` taking precedence. 
+
+
+Example Output
+--------------
+
+.. code-block:: javascript
+
+    {
+    "filename": "tests/test_files/sounddevices/A101_1.WAV",
+    "run_date": "2022-11-26T17:56:38.342935",
+    "application": "wavinfo 2.1.0",
+    "scopes": {
+        "fmt": {
+        "audio_format": 1,
+        "channel_count": 2,
+        "sample_rate": 48000,
+        "byte_rate": 288000,
+        "block_align": 6,
+        "bits_per_sample": 24
+        },
+        "data": {
+        "byte_count": 1441434,
+        "frame_count": 240239
+        },
+        "ixml": {
+        "track_list": [
+            {
+            "channel_index": "1",
+            "interleave_index": "1",
+            "name": "MKH516 A",
+            "function": ""
+            },
+            {
+            "channel_index": "2",
+            "interleave_index": "2",
+            "name": "Boom",
+            "function": ""
+            }
+        ],
+        "project": "BMH",
+        "scene": "A101",
+        "take": "1",
+        "tape": "18Y12M31",
+        "family_uid": "USSDVGR1112089007124001008206300",
+        "family_name": null
+        },
+        "bext": {
+        "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": "0000000000000000000000000000000000000000000000000000000000000000",
+        "coding_history": "A=PCM,F=48000,W=24,M=stereo,R=48000,T=2 Ch\r\n",
+        "loudness_value": null,
+        "loudness_range": null,
+        "max_true_peak": null,
+        "max_momentary_loudness": null,
+        "max_shortterm_loudness": null
+        }
+    }
+    }
+

docs/source/index.rst

@@ -6,15 +6,19 @@
 Welcome to wavinfo's documentation!
 ===================================
 
+The `wavinfo` package allows you to probe WAVE and RF64/WAVE files and 
+extract extended metadata, with an emphasis on film, video and professional 
+music production metadata.
+
+
 .. toctree::
-   :maxdepth: 2
-   :caption: Notes
+   :maxdepth: 1
+   :glob:
+   :numbered:
    
    quickstart
-   metadata_scopes/adm.rst
-   metadata_scopes/bext.rst
-   metadata_scopes/info.rst
-   metadata_scopes/ixml.rst
+   command_line
+   scopes/*
 
    classes
 

docs/source/metadata_scopes/adm.rst

@@ -1,15 +0,0 @@
-ADM (Audio Definition Model) Metadata
-=====================================
-
-Notes
------
-
-
-
-Class Reference
----------------
-
-.. module:: wavinfo
-
-.. autoclass:: wavinfo.wave_adm_reader.WavADMReader
-    :members:

docs/source/quickstart.rst

@@ -1,6 +1,11 @@
-ptulsconv Quickstart
+wavinfo Quickstart
 ====================
 
+All metadata is read by an instance of :class:`WaveInfoReader<wavinfo.wave_reader.WavInfoReader>`.
+Each type of metadata, iXML, Broadcast-WAV etc. is accessible through *scopes*, properties on an 
+instance of :class:`WaveInfoReader`. 
+
+
 .. code-block:: python
     :caption: Using wavinfo
 
@@ -10,3 +15,10 @@ ptulsconv Quickstart
 
     info = wavinfo.WavInfoReader(path)
 
+
+.. module:: wavinfo
+    :noindex:
+
+.. autoclass:: wavinfo.wave_reader.WavInfoReader
+   :members:
+

docs/source/scopes/adm.rst

@@ -0,0 +1,30 @@
+ADM (Audio Definition Model) Metadata
+=====================================
+
+Notes
+-----
+
+`ADM metadata`_ is used in master recordings to describe the format and content 
+of the tracks. In practice on wave files, ADM tells a client which tracks are 
+members of multichannel stems or "beds" and their speaker assignment, and which 
+tracks are freely-positioned 3D objects. ADM also records the panning moves on
+object tracks and their content group ("Dialogue", "Music", "Effects" etc.)
+
+ADM wave files created with a Dolby Rendering and Mastering Unit are a common 
+deliverable in feature film and television production. The `Dolby Atmos ADM Profile`_ 
+describes how the RMU translates its native Master format into ADM. 
+ 
+
+.. _ADM metadata: https://adm.ebu.io
+.. _Dolby Atmos ADM Profile: https://developer.dolby.com/globalassets/documentation/technology/dolby_atmos_master_adm_profile_v1.0.pdf
+
+Class Reference
+---------------
+
+.. module:: wavinfo
+
+.. autoclass:: wavinfo.wave_adm_reader.WavADMReader
+    :members:
+
+.. autoclass:: wavinfo.wave_adm_reader.ChannelEntry
+    :members:

docs/source/scopes/bext.rst

@@ -1,5 +1,5 @@
-Broadcast WAV Extension
-=======================
+Broadcast WAV Extension Metadata
+================================
 
 
 Notes
@@ -9,20 +9,26 @@ which includes a 256-character free text descrption, creating entity identifier
 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.
+The :py:attr:`coding_history<wavinfo.wave_bext_reader.WavBextReader.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.
+information in the :py:attr:`description<wavinfo.wave_bext_reader.WavBextReader.description>`. 
+Here also the :py:attr:`originator_ref<wavinfo.wave_bext_reader.WavBextReader.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 
+If the bext metadata conforms to `EBU 3285 v1`_, it will contain the WAV's 32 or 64 byte `SMPTE 
+ST 330 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.
+If the bext metadata conforms to `EBU 3285 v2`_, it will hold precomputed program loudness values
+as described by `EBU Rec 128`_.
+
+.. _EBU 3285 v1: https://tech.ebu.ch/publications/tech3285s1
+.. _SMPTE ST 330 UMID: https://standards.globalspec.com/std/1396751/smpte-st-330
+.. _EBU 3285 v2: https://tech.ebu.ch/publications/tech3285s2
+.. _EBU Rec 128: https://tech.ebu.ch/publications/r128
 
 ..  code:: python
 

docs/source/scopes/dolby.rst

@@ -0,0 +1,21 @@
+Dolby Metadata
+==============
+
+Notes
+-----
+
+Dolby software and equipment creates detailed hinting metadata that can help
+receiving applications decide how to present the audio content, particularly
+how it should be downmixed, and dialogue normalization settings. 
+
+
+Class Reference
+---------------
+
+.. automodule:: wavinfo.wave_dbmd_reader
+
+.. autoclass:: wavinfo.wave_dbmd_reader.WavDolbyMetadataReader
+    :members:
+
+.. autoclass:: wavinfo.wave_dbmd_reader.DolbyDigitalPlusMetadata
+    :members:

docs/source/scopes/info.rst

@@ -20,6 +20,17 @@ music library software.
     print("INFO Comment:",   bullet.info.comment)
 
 
+On Encodings
+""""""""""""
+According to Microsoft, the original developers of the RIFF file and RIFF INFO 
+metadata, these fields are always to be interpreted as ISO Latin 1 characters, 
+and this is the default encoding used by `wavinfo` for these fields. You can
+select a different encoding (like Shift-JIS) by passing an encoding name (as 
+would be used by `string.encode()`) to `WavInfoReader.__init__()`'s
+`info_encoding=` parameter.
+ 
+
+
 Class Reference
 ---------------
 

metadata.py

@@ -1,3 +0,0 @@
-"""
-Wavinfo
-"""

setup.py

@@ -1,5 +1,5 @@
 from setuptools import setup
-from .wavinfo import __author__, __license__, __version__
+from wavinfo import __author__, __license__, __version__
 
 with open("README.md", "r") as fh:
     long_description = fh.read()

tests/test_adm.py

@@ -23,6 +23,17 @@ class TestADMWave(TestCase):
         dict = adm.to_dict()
         self.assertIsNotNone(dict)
     
+    def test_programme(self):
+        info = wavinfo.WavInfoReader(self.protools_adm_wav)
+        adm = info.adm
+        pdict = adm.programme()
+        self.assertIn("programme_id", pdict.keys())
+        self.assertIn("programme_name", pdict.keys())
+        self.assertEqual(pdict['programme_id'], 'APR_1001')
+        self.assertEqual(pdict['programme_name'], 'Atmos_Master')
+        self.assertIn("contents", pdict.keys())
+        self.assertEqual(len(pdict["contents"]), 3)
+
     def test_track_info(self):
         info = wavinfo.WavInfoReader(self.protools_adm_wav)
         adm = info.adm

tests/test_dolby.py

@@ -0,0 +1,49 @@
+from unittest import TestCase
+
+import wavinfo
+from wavinfo.wave_dbmd_reader import SegmentType, DolbyAtmosMetadata, DolbyDigitalPlusMetadata
+
+class TestDolby(TestCase):
+    def setUp(self):
+        self.test_file = "tests/test_files/protools/Test_ADM_ProTools.wav"
+
+    def test_version(self):
+        t1 = wavinfo.WavInfoReader(self.test_file)
+        d = t1.dolby
+
+        self.assertEqual((1,0,0,6), d.version)
+
+    def test_segments(self):
+        t1 = wavinfo.WavInfoReader(self.test_file)
+        d = t1.dolby
+
+        ddp = [x for x in d.segment_list if x[0] == SegmentType.DolbyDigitalPlus]
+        atmos = [x for x in d.segment_list if x[0] == SegmentType.DolbyAtmos]
+
+        self.assertEqual(len(ddp), 1)
+        self.assertEqual(len(atmos), 1)
+
+    def test_checksums(self):
+        t1 = wavinfo.WavInfoReader(self.test_file)
+        d = t1.dolby
+
+        for seg in d.segment_list:
+            self.assertTrue(seg[1])
+
+    def test_ddp(self):
+        t1 = wavinfo.WavInfoReader(self.test_file)
+        d = t1.dolby
+
+        ddp = d.dolby_digital_plus()
+        self.assertEqual(len(ddp), 1, "Failed to find exactly one Dolby Digital Plus metadata segment")
+        self.assertTrue( ddp[0].audio_coding_mode, DolbyDigitalPlusMetadata.AudioCodingMode.CH_ORD_3_2 )
+        self.assertTrue( ddp[0].lfe_on)
+        
+    def test_atmos(self):
+        t1 = wavinfo.WavInfoReader(self.test_file)
+        d = t1.dolby
+
+        atmos = d.dolby_atmos()
+        self.assertEqual(len(atmos), 1, "Failed to find exactly one Atmos metadata segment")
+
+    

wavinfo/__init__.py

@@ -1,12 +1,12 @@
 """
 methods to probe a WAV file for various kinds of production metadata.
 
-Go to the documentation for wavinfo.WavInfoReader for more information.
+See the documentation for `wavinfo.WavInfoReader` for more information.
 """
 
 from .wave_reader import WavInfoReader
 from .riff_parser import WavInfoEOFError
 
-__version__ = '2.0.1'
+__version__ = '2.1.0'
 __author__ = 'Jamie Hardt <jamiehardt@gmail.com>'
 __license__ = "MIT"

wavinfo/__main__.py

@@ -1,33 +1,69 @@
 from optparse import OptionParser, OptionGroup
 import datetime
 from . import WavInfoReader
+from . import __version__
 import sys
 import json
+from enum import Enum
 
+class MyJSONEncoder(json.JSONEncoder):
+    def default(self, o):
+        if isinstance(o, Enum):
+            return o._name_
+        else:
+            return super().default(o)
+
+class MissingDataError(RuntimeError):
+    pass
 
 def main():
     parser = OptionParser()
 
-    parser.usage = 'wavinfo [FILE.wav]*'
+    parser.usage = 'wavinfo (--adm | --ixml) [FILES]'
 
     # parser.add_option('-f', dest='output_format', help='Set the output format',
     #                   default='json',
     #                   metavar='FORMAT')
 
+    parser.add_option('--adm', dest='adm', help='Output ADM XML', 
+        default=False, action='store_true')
+
+    parser.add_option('--ixml', dest='ixml', help='Output iXML',
+        default=False, action='store_true')
+
     (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] = {}
+            if options.adm:
+                if this_file.adm:
+                    sys.stdout.write(this_file.adm.xml_str())
+                else:
+                    raise MissingDataError("adm")
+            elif options.ixml:
+                if this_file.ixml:
+                    sys.stdout.write(this_file.ixml.xml_bytes())
+                else:
+                    raise MissingDataError("ixml")
+            else:
+                ret_dict = {
+                    'filename': arg, 
+                    'run_date': datetime.datetime.now().isoformat() , 
+                    'application': "wavinfo " + __version__, 
+                    '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
+                    ret_dict['scopes'][scope][name] = value
 
-            json.dump(ret_dict, fp=sys.stdout, indent=2)
+                json.dump(ret_dict, cls=MyJSONEncoder, fp=sys.stdout, indent=2)
+        except MissingDataError as e:
+            print("MissingDataError: Missing metadata (%s) in file %s" % (e, arg), file=sys.stderr)
+            continue
         except Exception as e:
-            print(e)
+            raise e
 
 
 if __name__ == "__main__":

wavinfo/dolby_parser.py

@@ -1,188 +0,0 @@
-# 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/wave_adm_reader.py

@@ -14,6 +14,7 @@ ChannelEntry = namedtuple('ChannelEntry', "track_index uid track_ref pack_ref")
 class WavADMReader:
     """
     Reads XML data from an EBU ADM (Audio Definiton Model) WAV File.
+
     """
 
     def __init__(self, axml_data: bytes, chna_data: bytes):
@@ -26,7 +27,12 @@ class WavADMReader:
         _, uid_count = unpack(header_fmt, chna_data[0:4])
 
         #: A list of :class:`ChannelEntry` objects parsed from the
-        #: `chna` metadata chunk. 
+        #: `chna` metadata chunk.
+        #:
+        #: .. note::
+        #:    In-file, the `chna` track indexes start at 1. However, this interface
+        #:    numbers the first track 0, in order to maintain consistency with other
+        #:    libraries.
         self.channel_uids = []
 
         offset = calcsize(header_fmt)
@@ -36,21 +42,68 @@ class WavADMReader:
 
             # these values are either ascii or all null
 
-            self.channel_uids.append(ChannelEntry(track_index,
+            self.channel_uids.append(ChannelEntry(track_index - 1,
                 uid.decode('ascii') , track_ref.decode('ascii'), pack_ref.decode('ascii')))
 
             offset += calcsize(uid_fmt)
 
+    def xml_str(self) -> str:
+        """ADM XML as a string"""
+        return ET.tostring(self.axml).decode("utf-8")
+
+    def programme(self) -> dict:
+        """
+        Extract the ADM audioProgramme data structure and some of its reference properties 
+        """
+        ret_dict = dict()
+
+        nsmap = self.axml.getroot().nsmap 
+        
+        afext = self.axml.find(".//audioFormatExtended", namespaces=nsmap)
+
+        program = afext.find("audioProgramme", namespaces=nsmap)
+        ret_dict['programme_id'] = program.get("audioProgrammeID")
+        ret_dict['programme_name'] = program.get("audioProgrammeName")
+        ret_dict['programme_start'] = program.get("start")
+        ret_dict['programme_end'] = program.get("end")
+        ret_dict['contents'] = []
+
+        for content_ref in program.findall("audioContentIDRef", namespaces=nsmap):
+            content_dict = dict()
+            content_dict['content_id'] = cid = content_ref.text
+            content = afext.find("audioContent[@audioContentID='%s']" % cid, namespaces=nsmap)
+            content_dict['content_name'] = content.get("audioContentName")
+            content_dict['objects'] = []
+
+            for object_ref in content.findall("audioObjectIDRef", namespaces=nsmap):
+                object_dict = dict()
+                object_dict['object_id'] = oid = object_ref.text
+                object = afext.find("audioObject[@audioObjectID='%s']" % oid, namespaces=nsmap)
+                pack = object.find("audioPackFormatIDRef", namespaces=nsmap)
+                object_dict['object_name'] = object.get("audioObjectName")
+                object_dict['object_start'] = object.get("start")
+                object_dict['object_duration'] = object.get("duration")
+                object_dict['pack_id'] = pack.text
+                track_uid_list = []
+                for t in object.findall("audioTrackUIDRef", namespaces=nsmap):
+                    track_uid_list.append(t.text)
+
+                object_dict['track_uids'] = track_uid_list
+                content_dict['objects'].append(object_dict)
+
+            ret_dict['contents'].append(content_dict)
+
+        return ret_dict
 
     def track_info(self, index):
         """
         Information about a track in the WAV file.
 
         :param index: index of audio track (indexed from zero) 
-        :returns: a dictionary with content_name, object_name, pack_format_name, pack_type, 
-                  channel_format_name
+        :returns: a dictionary with *content_name*, *content_id*, *object_name*, *object_id*, 
+            *pack_format_name*, *pack_type*, *channel_format_name*
         """
-        channel_info = next((x for x in self.channel_uids if x.track_index == index + 1), None)
+        channel_info = next((x for x in self.channel_uids if x.track_index == index), None)
         
         if channel_info is None:
             return None
@@ -59,31 +112,54 @@ class WavADMReader:
 
         nsmap = self.axml.getroot().nsmap
 
-        trackformat_elem = self.axml.find(".//audioFormatExtended/audioTrackFormat[@audioTrackFormatID='%s']" % channel_info.track_ref, namespaces=nsmap)
+        afext = self.axml.find(".//audioFormatExtended", namespaces=nsmap)
+
+        trackformat_elem = afext.find("audioTrackFormat[@audioTrackFormatID='%s']" % channel_info.track_ref, 
+            namespaces=nsmap)
 
         stream_id = trackformat_elem[0].text
 
-        channelformatref_elem = self.axml.find(".//audioFormatExtended/audioStreamFormat[@audioStreamFormatID='%s']/audioChannelFormatIDRef" % stream_id, namespaces=nsmap)
+        channelformatref_elem = afext.find("audioStreamFormat[@audioStreamFormatID='%s']/audioChannelFormatIDRef" % stream_id, 
+            namespaces=nsmap)
         channelformat_id = channelformatref_elem.text
 
-        packformatref_elem = self.axml.find(".//audioFormatExtended/audioStreamFormat[@audioStreamFormatID='%s']/audioPackFormatIDRef" % stream_id, namespaces=nsmap)
+        packformatref_elem = afext.find("audioStreamFormat[@audioStreamFormatID='%s']/audioPackFormatIDRef" % stream_id, 
+            namespaces=nsmap)
         packformat_id = packformatref_elem.text
 
-        channelformat_elem = self.axml.find(".//audioFormatExtended/audioChannelFormat[@audioChannelFormatID='%s']" % channelformat_id, namespaces=nsmap)
+        channelformat_elem = afext.find("audioChannelFormat[@audioChannelFormatID='%s']" % channelformat_id, 
+            namespaces=nsmap)
         ret_dict['channel_format_name'] = channelformat_elem.get("audioChannelFormatName")
 
-        packformat_elem = self.axml.find(".//audioFormatExtended/audioPackFormat[@audioPackFormatID='%s']" % packformat_id, namespaces=nsmap)
+        packformat_elem = afext.find("audioPackFormat[@audioPackFormatID='%s']" % packformat_id, 
+            namespaces=nsmap)
         ret_dict['pack_type'] = packformat_elem.get("typeDefinition")
         ret_dict['pack_format_name'] = packformat_elem.get("audioPackFormatName")
 
-        object_elem = self.axml.find(".//audioFormatExtended/audioObject[audioPackFormatIDRef = '%s']" % packformat_id, namespaces=nsmap)
+        object_elem = afext.find("audioObject[audioPackFormatIDRef = '%s']" % packformat_id, 
+            namespaces=nsmap)
+
         ret_dict['audio_object_name'] = object_elem.get("audioObjectName")
         object_id = object_elem.get("audioObjectID")
+        ret_dict['object_id'] = object_id
+
+        content_elem = afext.find("audioContent/[audioObjectIDRef = '%s']" % object_id, 
+            namespaces=nsmap)
 
-        content_elem = self.axml.find(".//audioFormatExtended/audioContent/[audioObjectIDRef = '%s']" % object_id, namespaces=nsmap)
         ret_dict['content_name'] = content_elem.get("audioContentName")
+        ret_dict['content_id'] = content_elem.get("audioContentID")
 
         return ret_dict
 
     def to_dict(self):
-        return dict(channel_entries=list(map(lambda z: z._asdict(), self.channel_uids)))
+        """
+        Get ADM metadata as a dictionary.
+        """
+
+        def make_entry(channel_uid_rec):
+            rd = channel_uid_rec._asdict()
+            rd.update(self.track_info(channel_uid_rec.track_index))
+            return rd
+
+        return dict(channel_entries=list(map(lambda z: make_entry(z), self.channel_uids)),
+            programme=self.programme())

wavinfo/wave_bext_reader.py

@@ -17,6 +17,7 @@ class WavBextReader:
         unpacked = struct.unpack(packstring, bext_data[:rest_starts])
 
         def sanitize_bytes(b : bytes) -> str:
+            # honestly can't remember why I'm stripping nulls this way
             first_null = next((index for index, byte in enumerate(b) if byte == 0), None)
             trimmed = b if first_null is None else b[:first_null]
             decoded = trimmed.decode(encoding)
@@ -29,9 +30,9 @@ class WavBextReader:
         self.originator : str = sanitize_bytes(unpacked[1])
         #: A unique identifier for the file, a serial number.
         self.originator_ref : str = sanitize_bytes(unpacked[2])
-        #: Date of the recording, in the format YYY-MM-DD
+        #: Date of the recording, in the format YYYY-MM-DD in the local calendar
         self.originator_date : str = sanitize_bytes(unpacked[3])
-        #: Time of the recording, in the format HH:MM:SS.
+        #: Time of the recording, in the format HH:MM:SS on the local clock
         self.originator_time : str = sanitize_bytes(unpacked[4])
         #: The sample offset of the start of the file relative to an
         #: epoch, usually midnight the day of the recording. 

wavinfo/wave_dbmd_reader.py

@@ -0,0 +1,661 @@
+"""
+Reading Dolby Bitstream Metadata
+
+Unless otherwise stated, all § references here are to 
+`EBU Tech 3285 Supplement 6`_.
+
+.. _EBU Tech 3285 Supplement 6: https://tech.ebu.ch/docs/tech/tech3285s6.pdf
+"""
+
+from enum import IntEnum, Enum
+from struct import unpack
+from dataclasses import dataclass, asdict
+from typing import List, Optional, Tuple, Any, Union
+
+from io import BytesIO
+
+class SegmentType(IntEnum):
+    """
+    Metadata segment type.
+    """
+    EndMarker = 0x0
+    DolbyE = 0x1
+    # Reserved2 = 0x2
+    DolbyDigital = 0x3
+    # Reserved4 = 0x4
+    # Reserved5 = 0x5
+    # Reserved6 = 0x6
+    DolbyDigitalPlus = 0x7
+    AudioInfo = 0x8
+    DolbyAtmos = 0x9
+    DolbyAtmosSupplemental = 0xa
+
+    @classmethod
+    def _missing_(cls,val):
+        return val
+
+
+@dataclass
+class DolbyDigitalPlusMetadata:
+    """
+    *Dolby Digital Plus* is Dolby's brand for multichannel surround
+    on discrete formats that aren't AC-3 (Dolby Digital) or Dolby E. This 
+    metadata segment is present in ADM wave files created with a Dolby Atmos 
+    Production Suite.
+
+    Where an AC-3 bitstream can contain multiple programs, a Dolby Digital 
+    Plus bitstream will only contain one program.
+    """
+
+    class DownMixLevelToken(Enum):
+        """
+        A gain coefficient used in several metadata fields for downmix
+        scenarios.
+        """
+
+        PLUS_3DB = 0b000
+        "+3 dB"
+
+        PLUS_1_5DB = 0b001
+        "+1.5 dB"
+
+        UNITY = 0b010
+        "0dB"
+
+        MINUS_1_5DB = 0b011
+        "-1.5 dB"
+
+        MINUS_3DB = 0b100
+        "-3 dB"
+
+        MINUS_4_5DB = 0b101
+        "-4.5 dB"
+
+        MINUS_6DB = 0b110
+        "-6 dB"
+
+        MUTE = 0b111
+        "-∞ dB"
+
+
+    class DolbySurroundEncodingMode(Enum):
+        """
+        Dolby surround endcoding mode.
+        """
+        RESERVED = 0b11
+        IN_USE = 0b10
+        NOT_IN_USE = 0b01
+        NOT_INDICATED = 0b00
+
+
+    class BitStreamMode(Enum):
+        """
+        Dolby Digital Plus `bsmod` field
+        § 4.3.2.2
+        """
+
+        COMPLETE_MAIN = 0b000
+        "main audio service: complete main"
+
+        MUSIC_AND_EFFECTS = 0b001
+        "main audio service: music and effects"
+
+        VISUALLY_IMPAIRED = 0b010
+        "associated service: visually impaired"
+
+        HEARING_IMPAIRED = 0b011
+        "associated service: hearing impaired"
+
+        DIALOGUE_ONLY = 0b100
+        "associated service: dialogue"
+
+        COMMENTARY = 0b101
+        "associated service: commentary"
+
+        EMERGENCY = 0b110
+        "associated service: emergency"
+
+        VOICEOVER_KARAOKE = 0b111
+        """
+        associated service: voice over *OR* main audio service: karaoke.
+        If `acmod` is `0b001` (mono 1/0), this is voice-over, otherwise it
+        should be interpreted as karaoke.
+        """
+
+
+    class AudioCodingMode(Enum):
+        """
+        Dolby Digital Plus `acmod` field
+        § 4.3.2.3
+        """
+        RESERVED = 0b000
+        CH_ORD_1_0 = 0b001
+        "Mono"
+        CH_ORD_2_0 = 0b010
+        "L/R stereo"
+        CH_ORD_3_0 = 0b011
+        "LCR stereo"
+        CH_ORD_2_1 = 0b100
+        "LR + mono surround"
+        CH_ORD_3_1 = 0b101
+        "LCR + mono surround"
+        CH_ORD_2_2 = 0b110
+        "LR + LR surround"
+        CH_ORD_3_2 = 0b111
+        "LCR + LR surround"
+
+
+    class CenterDownMixLevel(Enum):
+        """
+        § 4.3.3.1
+        """
+
+        DOWN_3DB = 0b00
+        "Attenuate 3 dB"
+    
+        DOWN_45DB = 0b01
+        "Attenuate 4.5 dB"
+        
+        DOWN_6DB = 0b10
+        "Attenuate 6 dB"
+
+        RESERVED = 0b11
+
+
+    class SurroundDownMixLevel(Enum):
+        """
+        Dolby Digital Plus `surmixlev` field
+        § 4.3.3.2
+        """
+        DOWN_3DB = 0b00
+        DOWN_6DB = 0b01
+        MUTE = 0b10
+        RESERVED = 0b11
+
+
+    class LanguageCode(int):
+        """
+        § 4.3.4.1
+
+        Per ATSC/A52 § 5.4.2.12, this is not in use and always 0xFF.
+        """
+        pass
+
+
+    class MixLevel(int):
+        """
+        § 4.3.6.2
+        """
+        pass
+
+
+    class DialnormLevel(int):
+        """
+        § 4.3.4.4
+        """
+        pass
+
+
+    class RoomType(Enum):
+        """
+        `roomtyp` 4.3.6.3
+        """
+        NOT_INDICATED = 0b00
+        LARGE_ROOM_X_CURVE = 0b01
+        SMALL_ROOM_FLAT_CURVE = 0b10
+        RESERVED = 0b11
+
+
+    class PreferredDownMixMode(Enum):
+        """
+        Indicates the creating engineer's preference of what the receiver should
+        downmix.
+        § 4.3.8.1
+        """
+        NOT_INDICATED = 0b00
+        PRO_LOGIC = 0b01
+        STEREO = 0b10
+        PRO_LOGIC_2 = 0b11
+
+
+    class SurroundEXMode(IntEnum):
+        """
+        Dolby Surround-EX mode.
+        `dsurexmod` § 4.3.9.1
+        """
+        NOT_INDICATED = 0b00
+        NOT_SEX = 0b01
+        SEX = 0b10
+        PRO_LOGIC_2 = 0b11
+
+
+    class HeadphoneMode(IntEnum):
+        """
+        `dheadphonmod` § 4.3.9.2
+        """
+        NOT_INDICATED = 0b00
+        NOT_DOLBY_HEADPHONE = 0b01
+        DOLBY_HEADPHONE = 0b10
+        RESERVED = 0b11
+
+
+    class ADConverterType(Enum):
+        STANDARD = 0
+        HDCD = 1
+
+
+    class StreamDependency(Enum):
+        """
+        Encodes `ddplus_info1.stream_type` field § 4.3.12.1
+        """
+
+        INDEPENDENT = 0
+        DEPENDENT = 1
+        INDEPENDENT_FROM_DOLBY_DIGITAL = 2
+        RESERVED = 3
+
+
+    class RFCompressionProfile(Enum):
+        """
+        `compr1` RF compression profile
+        § 4.3.10 (fig 42)
+        """
+        NONE = 0
+        FILM_STANDARD = 1
+        FILM_LIGHT = 2
+        MUSIC_STANDARD = 3
+        MUSIC_LIGHT = 4
+        SPEECH = 5
+
+    #: Program ID number, this identifies the program in a multi-program 
+    #: element. § 4.3.1
+    program_id: int
+
+    #: `True` if LFE is enabled. § 4.3.2.1
+    lfe_on: bool
+
+    #: The kind of service of this stream. `bsmod` § 4.3.2.2
+    bitstream_mode: BitStreamMode
+
+    #: Indicates which channels are in use. `acmod` § 4.3.2.3
+    audio_coding_mode: AudioCodingMode
+
+    #: When the front three channels are in use, gives the center
+    #: downmix level. ``
+    center_downmix_level: CenterDownMixLevel
+
+    #: When the surround channels are in use, gives the surround
+    #: downmix level.
+    surround_downmix_level: SurroundDownMixLevel
+
+    #: If the `acmod` is LR, this indicates if the channels
+    #: are encoded in Dolby Surround.
+    dolby_surround_encoded: DolbySurroundEncodingMode
+
+    #: `True` if there is a langcode present in the metadata.
+    langcode_present: bool
+
+    #: `True` if this bitstream is copyrighted.
+    copyright_bitstream: bool
+
+    #: `True` if this bitstream is original.
+    original_bitstream: bool
+
+    dialnorm: DialnormLevel
+
+    #: Language code
+    langcode: int
+
+    #: `True` if `mixlevel` and `roomtype` are valid
+    prod_info_exists: bool
+
+    #: Mix level
+    mixlevel: MixLevel
+
+    #: Room Type
+    roomtype: RoomType
+
+    #: LoRo preferred center downmix level
+    loro_center_downmix_level: DownMixLevelToken
+    
+    #: LoRo preferred surround downmix level
+    loro_surround_downmix_level: DownMixLevelToken
+
+    #: Preferred downmix mode
+    downmix_mode: PreferredDownMixMode
+    
+    #: LtRt preferred center downmix level
+    ltrt_center_downmix_level: DownMixLevelToken
+
+    #: LtRt preferred surround downmix level
+    ltrt_surround_downmix_level: DownMixLevelToken
+
+    #: Surround-EX mode
+    surround_ex_mode: SurroundEXMode
+    
+    #: Dolby Headphone mode
+    dolby_headphone_encoded: HeadphoneMode
+
+    ad_converter_type: ADConverterType
+    compression_profile: RFCompressionProfile
+    dynamic_range: RFCompressionProfile
+    
+    #: Indicates if this stream can be decoded independently or not
+    stream_dependency: StreamDependency
+
+    #: Data rate of this bitstream in kilobits per second
+    datarate_kbps: int
+    
+    @staticmethod
+    def load(buffer: bytes):
+        assert len(buffer) == 96, "Dolby Digital Plus segment incorrect size, "
+        "expected 96 got %i" % len(buffer)
+
+        def program_id(b) -> int:
+            return b
+
+        def program_info(b):
+            return (b & 0x40) > 0, \
+                DolbyDigitalPlusMetadata.BitStreamMode(b & 0x38 >> 3), \
+                DolbyDigitalPlusMetadata.AudioCodingMode(b & 0x7)
+
+        def ddplus_reserved1(_):
+            pass
+
+        def surround_config(b):
+            return DolbyDigitalPlusMetadata.CenterDownMixLevel(b & 0x30 >> 4), \
+                DolbyDigitalPlusMetadata.SurroundDownMixLevel(b & 0xc >> 2), \
+                DolbyDigitalPlusMetadata.DolbySurroundEncodingMode(b & 0x3)
+
+        def dialnorm_info(b):
+            return (b & 0x80) > 0 , b & 0x40 > 0, b & 0x20 > 0, \
+                DolbyDigitalPlusMetadata.DialnormLevel(b & 0x1f)
+
+        def langcod(b) -> int:
+            return b
+
+        def audio_prod_info(b):
+            return (b & 0x80) > 0, \
+                DolbyDigitalPlusMetadata.MixLevel(b & 0x7c >> 2), \
+                DolbyDigitalPlusMetadata.RoomType(b & 0x3)
+
+        # loro_center_downmix_level, loro_surround_downmix_level 
+        def ext_bsi1_word1(b):
+            return DolbyDigitalPlusMetadata.DownMixLevelToken(b & 0x38 >> 3), \
+                DolbyDigitalPlusMetadata.DownMixLevelToken(b & 0x7)
+
+        # downmix_mode, ltrt_center_downmix_level, ltrt_surround_downmix_level
+        def ext_bsi1_word2(b):
+            return DolbyDigitalPlusMetadata.PreferredDownMixMode(b & 0xC0 >> 6), \
+                DolbyDigitalPlusMetadata.DownMixLevelToken(b & 0x38 >> 3), \
+                DolbyDigitalPlusMetadata.DownMixLevelToken(b & 0x7)
+
+        #surround_ex_mode, dolby_headphone_encoded, ad_converter_type 
+        def ext_bsi2_word1(b):
+            return DolbyDigitalPlusMetadata.SurroundEXMode(b & 0x60 >> 5), \
+                DolbyDigitalPlusMetadata.HeadphoneMode(b & 0x18 >> 3), \
+                DolbyDigitalPlusMetadata.ADConverterType( b & 0x4 >> 2)
+
+        def ddplus_reserved2(_):
+            pass
+
+        def compr1(b):
+            return DolbyDigitalPlusMetadata.RFCompressionProfile(b)
+
+        def dynrng1(b):
+            DolbyDigitalPlusMetadata.RFCompressionProfile(b) 
+
+        def ddplus_reserved3(_):
+            pass
+
+        def ddplus_info1(b):
+            return DolbyDigitalPlusMetadata.StreamDependency(b & 0xc >> 2)
+
+        def ddplus_reserved4(_):
+            pass
+
+        def datarate(b) -> int:
+            return unpack("<H", b)[0]
+
+        def reserved(_):
+            pass
+
+        pid = program_id(buffer[0])
+        lfe_on, bitstream_mode, audio_coding_mode = program_info(buffer[1])
+        ddplus_reserved1(buffer[2:2])
+        center_downmix_level, surround_downmix_level, dolby_surround_encoded = surround_config(buffer[4])
+        langcode_present, copyright_bitstream, original_bitstream, dialnorm = dialnorm_info(buffer[5])
+        langcode = langcod(buffer[6])
+        prod_info_exists, mixlevel, roomtype = audio_prod_info(buffer[7])
+
+        loro_center_downmix_level, loro_surround_downmix_level = ext_bsi1_word1(buffer[8])
+        downmix_mode, ltrt_center_downmix_level, ltrt_surround_downmix_level = ext_bsi1_word2(buffer[9])
+        surround_ex_mode, dolby_headphone_encoded, ad_converter_type = ext_bsi2_word1(buffer[10])
+
+        ddplus_reserved2(buffer[11:14])
+        compression = compr1(buffer[14])
+        dynamic_range = dynrng1(buffer[15])
+        ddplus_reserved3(buffer[16:19])
+        stream_info = ddplus_info1(buffer[19])
+        ddplus_reserved4(buffer[20:25])
+        data_rate = datarate(buffer[25:27])
+        reserved(buffer[27:69])
+
+        return DolbyDigitalPlusMetadata(program_id=pid,
+            lfe_on=lfe_on, 
+            bitstream_mode=bitstream_mode,
+            audio_coding_mode=audio_coding_mode,
+            center_downmix_level=center_downmix_level,
+            surround_downmix_level=surround_downmix_level,
+            dolby_surround_encoded=dolby_surround_encoded, 
+            langcode_present=langcode_present, 
+            copyright_bitstream=copyright_bitstream, 
+            original_bitstream=original_bitstream,
+            dialnorm=dialnorm, 
+            langcode=langcode,
+            prod_info_exists=prod_info_exists,
+            mixlevel=mixlevel,
+            roomtype=roomtype,
+            loro_center_downmix_level=loro_center_downmix_level,
+            loro_surround_downmix_level=loro_surround_downmix_level,
+            downmix_mode=downmix_mode,
+            ltrt_center_downmix_level=ltrt_center_downmix_level, 
+            ltrt_surround_downmix_level=ltrt_surround_downmix_level,
+            surround_ex_mode=surround_ex_mode,
+            dolby_headphone_encoded=dolby_headphone_encoded,
+            ad_converter_type=ad_converter_type,
+            compression_profile=compression,
+            dynamic_range=dynamic_range,
+            stream_dependency=stream_info,
+            datarate_kbps=data_rate)
+
+
+@dataclass
+class DolbyAtmosMetadata:
+    """
+    Dolby Atmos Metadata Segment
+
+    https://github.com/DolbyLaboratories/dbmd-atmos-parser/
+    """
+
+    class WarpMode(Enum):
+        NORMAL = 0x00
+        WARPING = 0x01
+        DOWNMIX_PLIIX = 0x02
+        DOWNMIX_LORO = 0x03
+        NOT_INDICATED = 0x04
+
+    tool_name: str
+    tool_version: Tuple[int,int,int]
+    warp_mode: WarpMode
+
+    SEGMENT_LENGTH = 248
+    TOOL_NAME_LENGTH = 64
+
+    @classmethod
+    def load(cls, data: bytes):
+        assert len(data) == cls.SEGMENT_LENGTH, "DolbyAtmosMetadata segment "\
+            "is incorrect length, expected %i actual was %i" % (cls.SEGMENT_LENGTH, len(data)) 
+
+        h = BytesIO(data)
+
+        h.seek(32, 1)
+        toolname = h.read(cls.TOOL_NAME_LENGTH)
+        toolname = unpack("%is" % cls.TOOL_NAME_LENGTH, toolname)[0]
+        toolname = toolname.decode('utf-8').strip('\0')
+
+        vers = h.read(3)
+        major, minor, fix = unpack("BBB", vers)
+
+        h.seek(53, 1)
+
+        a_val = unpack("B", h.read(1))[0]
+        warp_mode = a_val & 0x7
+
+        return DolbyAtmosMetadata(tool_name=toolname, 
+            tool_version=(major, minor, fix), warp_mode=DolbyAtmosMetadata.WarpMode(warp_mode))
+
+        
+@dataclass
+class DolbyAtmosSupplementalMetadata:
+    """
+    Dolby Atmos supplemental metadata segment.
+
+    https://github.com/DolbyLaboratories/dbmd-atmos-parser/blob/master/dbmd_atmos_parse/src/dbmd_atmos_parse.c
+    """ 
+
+    class BinauralRenderMode(Enum):
+        BYPASS = 0x00
+        NEAR = 0x01
+        FAR = 0x02
+        MID = 0x03
+        NOT_INDICATED = 0x04
+
+
+    object_count: int
+    render_modes: List['DolbyAtmosSupplementalMetadata.BinauralRenderMode']
+    trim_modes: List[int]
+
+
+    MAGIC = 0xf8726fbd
+    TRIM_CONFIG_COUNT = 9
+
+    @classmethod
+    def load(cls, data: bytes):
+
+        trim_modes = []
+        render_modes = []
+
+        h = BytesIO(data)
+        magic = unpack("<I", h.read(4))
+        assert magic == cls.MAGIC, "Magic value was not found"
+
+        object_count = unpack("<H", h.read(2))
+
+        h.read(1) #skip 1
+
+        for _ in range(cls.TRIM_CONFIG_COUNT):
+            auto_trim = unpack("B", h.read(1))
+            trim_modes.append(auto_trim)
+
+            h.read(14) #skip 14
+        
+        h.read(object_count) # skip object_count bytes
+
+        for _ in range(object_count):
+            binaural_mode = unpack("B", h.read(1))
+            binaural_mode &= 0x7
+            render_modes.append(binaural_mode)
+
+        return DolbyAtmosSupplementalMetadata(object_count=object_count,
+            render_modes=render_modes,trim_modes=trim_modes)
+
+
+class WavDolbyMetadataReader:
+    """
+    Reads Dolby bitstream metadata.
+    """
+
+    #: List of the Dolby Metadata Segments.
+    #:
+    #: Each list entry is a tuple of `SegmentType`, a `bool`
+    #: indicating if the segment's checksum was valid, and the
+    #: segment's parsed dataclass (or a `bytes` array if it was 
+    #: not recognized).
+    segment_list: Tuple[Union[SegmentType, int], bool, Any] 
+
+    version: Tuple[int,int,int,int]
+
+    @staticmethod
+    def segment_checksum(bs: bytes, size: int):
+        retval = size
+        for b in bs:
+            retval += int(b)
+            retval &= 0xff
+
+        retval = ((~retval) + 1) & 0xff
+
+        return retval
+
+
+    def __init__(self, dbmd_data) -> None:
+        self.segment_list = []
+
+        h = BytesIO(dbmd_data)
+
+        v_vec = []
+        for _ in range(4):
+            b = h.read(1)
+            v_vec.insert(0, unpack("B",b)[0])
+        
+        self.version = tuple(v_vec)
+
+        while True:
+            stype= SegmentType(unpack("B", h.read(1))[0])
+            if stype == SegmentType.EndMarker:
+                break
+            else:
+                seg_size = unpack("<H", h.read(2))[0]
+                seg_payload = h.read(seg_size)
+                expected_checksum = WavDolbyMetadataReader.segment_checksum(seg_payload, seg_size)
+                checksum = unpack("B", h.read(1))[0]
+
+                segment = seg_payload
+                if stype == SegmentType.DolbyDigitalPlus:
+                    segment = DolbyDigitalPlusMetadata.load(segment)
+                elif stype == SegmentType.DolbyAtmos:
+                    segment = DolbyAtmosMetadata.load(segment)
+                # elif stype == SegmentType.DolbyAtmosSupplemental:
+                #     segment = DolbyAtmosSupplementalMetadata.load(segment)
+                
+                self.segment_list.append( (stype, checksum == expected_checksum, segment) )
+    
+    def dolby_digital_plus(self) -> List[DolbyDigitalPlusMetadata]:
+        """
+        Every valid Dolby Digital Plus metadata segment in the file.
+        """
+        return [x[2] for x in self.segment_list \
+            if x[0] == SegmentType.DolbyDigitalPlus and x[1]]
+
+    def dolby_atmos(self) -> List[DolbyAtmosMetadata]:
+        """
+        Every valid Dolby Atmos metadata segment in the file.
+        """
+        return [x[2] for x in self.segment_list \
+            if x[0] == SegmentType.DolbyAtmos and x[1]]
+
+    # def dolby_atmos_supplemental(self) -> List[DolbyAtmosSupplementalMetadata]:
+    #     """
+    #     Every valid Dolby Atmos Supplemental metadata segment in the file.
+    #     """
+    #     return [x[2] for x in self.segment_list \
+    #         if x[0] == SegmentType.DolbyAtmosSupplemental and x[1]]
+
+    def to_dict(self) -> dict:
+
+        ddp = map(lambda x: asdict(x), self.dolby_digital_plus())
+        atmos = map(lambda x: asdict(x), self.dolby_atmos())
+        #atmos_sup = map(lambda x: asdict(x), self.dolby_atmos_supplemental())
+        
+        return dict(dolby_digital_plus=list(ddp),
+             dolby_atmos=list(atmos))

wavinfo/wave_ixml_reader.py

@@ -27,6 +27,9 @@ class WavIXMLFormat:
         else: 
             return None
 
+    def xml_bytes(self):
+        return ET.tostring(self.parsed).decode("utf-8")
+
     @property
     def raw_xml(self):
         """
@@ -38,7 +41,7 @@ class WavIXMLFormat:
     def track_list(self):
         """
         A description of each track.
-        :return: An Iterator
+        :returns: An Iterator
         """
         for track in self.parsed.find("./TRACK_LIST").iter():
             if track.tag == 'TRACK':

wavinfo/wave_reader.py

@@ -3,6 +3,8 @@ import struct
 import os
 from collections import namedtuple
 
+from typing import Optional, Generator, Any
+
 import pathlib
 
 from .riff_parser import parse_chunk, ChunkDescriptor, ListChunkDescriptor
@@ -10,6 +12,7 @@ from .wave_ixml_reader import WavIXMLFormat
 from .wave_bext_reader import WavBextReader
 from .wave_info_reader import WavInfoChunkReader
 from .wave_adm_reader import WavADMReader
+from .wave_dbmd_reader import WavDolbyMetadataReader
 
 #: Calculated statistics about the audio data.
 WavDataDescriptor = namedtuple('WavDataDescriptor', 'byte_count frame_count')
@@ -22,6 +25,8 @@ WavAudioFormat = namedtuple('WavAudioFormat',
 class WavInfoReader:
     """
     Parse a WAV audio file for metadata.
+
+    
     """
 
     def __init__(self, path, info_encoding='latin_1', bext_encoding='ascii'):
@@ -55,10 +60,30 @@ class WavInfoReader:
             absolute_path = os.path.abspath(path)
 
             #: `file://` url for the file.
-            self.url = pathlib.Path(absolute_path).as_uri()
+            self.url: pathlib.Path = pathlib.Path(absolute_path).as_uri()
 
-            # for __repr__()
             self.path = absolute_path
+
+            #: Wave audio data format.
+            self.fmt :Optional[WavAudioFormat] = None
+
+            #: Statistics of the `data` section.
+            self.data :Optional[WavDataDescriptor] = None
+
+            #: Broadcast-Wave metadata.
+            self.bext :Optional[WavBextReader] = None
+
+            #: iXML metadata.
+            self.ixml :Optional[WavIXMLFormat] = None
+
+            #: ADM Audio Definiton Model metadata.
+            self.adm :Optional[WavADMReader]= None
+
+            #: Dolby bitstream metadata.
+            self.dolby :Optional[WavDolbyMetadataReader] = None
+
+            #: RIFF INFO metadata.
+            self.info :Optional[WavInfoChunkReader]= None
             
             with open(path, 'rb') as f:
                 self.get_wav_info(f)
@@ -69,20 +94,12 @@ class WavInfoReader:
         self.main_list = chunks.children
         wavfile.seek(0)
 
-        #: :class:`wavinfo.wave_reader.WavAudioFormat`
         self.fmt = self._get_format(wavfile)
-
-        #: :class:`wavinfo.wave_bext_reader.WavBextReader` with Broadcast-WAV metadata
         self.bext = self._get_bext(wavfile, encoding=self.bext_encoding)
-
-        #: :class:`wavinfo.wave_ixml_reader.WavIXMLFormat` with iXML metadata
         self.ixml = self._get_ixml(wavfile)
-
-        #: :class:`wavinfo.wave_axml_reader.WavAxmlReader` with ADM metadata
         self.adm  = self._get_adm(wavfile)
-
-        #: :class:`wavinfo.wave_info_reader.WavInfoChunkReader` with RIFF INFO metadata
         self.info = self._get_info(wavfile, encoding=self.info_encoding)
+        self.dolby = self._get_dbmd(wavfile)
         self.data = self._describe_data()
 
     def _find_chunk_data(self, ident, from_stream, default_none=False):
@@ -141,21 +158,24 @@ class WavInfoReader:
         chna = self._find_chunk_data(b'chna', f, default_none=True)
         return WavADMReader(axml_data=axml, chna_data=chna) if axml and chna else None
 
+    def _get_dbmd(self, f):
+        dbmd_data = self._find_chunk_data(b'dbmd', f, default_none=True)
+        return WavDolbyMetadataReader(dbmd_data=dbmd_data) if dbmd_data else None
+
     def _get_ixml(self, f):
         ixml_data = self._find_chunk_data(b'iXML', f, default_none=True)
-        return None if ixml_data is None else WavIXMLFormat(ixml_data.rstrip(b'\0'))
+        return WavIXMLFormat(ixml_data.rstrip(b'\0')) if ixml_data else None
 
-    def walk(self):
+    def walk(self) -> Generator[str,str,Any]: #FIXME: this should probably be named "iter()"
         """
         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.
-
         
+        :yields: tuples of the *scope*, *key*, and *value* of
+            each metadatum. The *scope* value will be one of
+            "fmt", "data", "ixml", "bext", "info", "dolby", or "adm".
         """
 
-        scopes = ('fmt', 'data', 'ixml', 'bext', 'info', 'adm')
+        scopes = ('fmt', 'data', 'ixml', 'bext', 'info', 'adm', 'dolby')
 
         for scope in scopes:
             if scope in ['fmt', 'data']:
@@ -168,6 +188,5 @@ class WavInfoReader:
                 for key in dict.keys():
                     yield scope, key, dict[key]
         
-
     def __repr__(self):
         return 'WavInfoReader({}, {}, {})'.format(self.path, self.info_encoding, self.bext_encoding)