Fixed publish to Bluesky worksflow

Updated `checkout` and `setup-python` versions

.github/workflows/python-flake8.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.11"]
+        python-version: ["3.13"]
 
     steps:
     - uses: actions/checkout@v2.5.0

.github/workflows/pythonpublish.yml

@@ -8,29 +8,29 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4.2.2
     - name: Set up Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5.3.0
       with:
         python-version: '3.x'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install setuptools build wheel twine lxml
-    - name: Build and publish
-      env:
-        TWINE_USERNAME: __token__
-        TWINE_PASSWORD: ${{ secrets.PYPI_APIKEY }}
-      run: |
+    - name: Build 
         python -m build .
-        twine upload dist/*
-    - name: Report to Mastodon
-      uses: cbrgm/mastodon-github-action@v1.0.1
+    - name: Publish to Pypi
+      uses: pypa/gh-action-pypi-publish@v1.12.2
       with:
-        message: |
-          I just released a new version of wavinfo, my library for reading WAVE file metadata!
-          #sounddesign #filmmaking #audio #python
-          ${{ github.server_url }}/${{ github.repository }}
-      env:
-        MASTODON_URL: ${{ secrets.MASTODON_URL }}
-        MASTODON_ACCESS_TOKEN: ${{ secrets.MASTODON_ACCESS_TOKEN }}
+        password: ${{ secrets.PYPI_APIKEY }}
+    - name: Send Bluesky Post
+      uses: myConsciousness/bluesky-post@v5
+      with:
+        text: |
+          I've released a new version of wavinfo, my module for 
+          reading WAVE metadata.
+        link-preview-url: ${{ github.server_url }}/${{ github.repository }}
+        identifier: ${{ secrets.BLUESKY_APP_USER }}  
+        password: ${{ secrets.BLUESKY_APP_PASSWORD }}
+        service: bsky.social    
+        retry-count: 1

.gitignore

@@ -110,3 +110,5 @@ venv_docs/
 .DS_Store
 
 .vscode/
+
+poetry.lock

README.md

@@ -31,6 +31,7 @@ it is not supported, please submit an issue!
   and Dolby Atmos `dbmd` metadata for re-renders and mixdowns.
 * Wave embedded [cue markers][cues], cue marker labels, notes and timed ranges as used
   by Zoom, iZotope RX, etc.
+* Wave embedded [sampler][smpl] and sample loop metadata.
 * The [wav format][format] is also parsed, so you can access the basic sample rate 
   and channel count information.
 
@@ -38,6 +39,7 @@ it is not supported, please submit an issue!
 [format]:https://wavinfo.readthedocs.io/en/latest/classes.html#wavinfo.wave_reader.WavAudioFormat
 [cues]:https://wavinfo.readthedocs.io/en/latest/scopes/cue.html
 [bext]:https://wavinfo.readthedocs.io/en/latest/scopes/bext.html
+[smpl]:https://wavinfo.readthedocs.io/en/latest/scopes/smpl.html
 [smpte_330m2011]:https://wavinfo.readthedocs.io/en/latest/scopes/bext.html#wavinfo.wave_bext_reader.WavBextReader.umid
 [adm]:https://wavinfo.readthedocs.io/en/latest/scopes/adm.html
 [ebu3285s6]:https://wavinfo.readthedocs.io/en/latest/scopes/dolby.html

docs/source/command_line.rst

@@ -6,89 +6,135 @@ 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.
+    $ wavinfo [[-i] | [--ixml | --adm]] INFILE +
 
 
 Options
 -------
 
-Two option flags will change the behavior of the command:
+By default, `wavinfo` will output a JSON dictionary for each file argument.
+
+``-i`` 
+    `wavinfo` will run in `interactive mode`_.
+
+Two option flags will change the behavior of the command in non-interactive 
+mode:
 
 ``--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.
+    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. 
+These options are mutually-exclusive, with `\-\-adm` taking precedence. The 
+``--ixml`` and ``--adm`` flags futher take precedence over ``-i``.
+
+
+Interactive Mode 
+-----------------
+
+In interactive mode, `wavinfo` will present a command prompt which allows you
+to query the files provided on the command line and explore the metadata tree 
+interactively. Each file on the command line is scanned and presented as a 
+tree of metadata records.
+
+Commands include:
+
+``ls``
+    List the available metadata keys at the current level.
+
+``cd``
+    Traverse to a metadata key in the current level (or enter `..` to go up 
+    to the prevvious level).
+
+``bye``
+    Exit to the shell.
+
+Type `help` or `?` at the prompt to get a full list of commands.
 
 
 Example Output
 --------------
 
+.. attention::
+
+   Metadata fields containing binary data, such as the Broadcast-WAV UMID, will 
+   be included in the JSON output as a base-64 encoded string, preceded by the
+   marker "base64:".
+
 .. 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
+  {
+  "filename": "../tests/test_files/nuendo/wavinfo Test Project - Audio - 1OA.wav",
+  "run_date": "2024-11-25T10:26:11.280053",
+  "application": "wavinfo 3.0.0",
+  "scopes": {
+    "fmt": {
+      "audio_format": 65534,
+      "channel_count": 4,
+      "sample_rate": 48000,
+      "byte_rate": 576000,
+      "block_align": 12,
+      "bits_per_sample": 24
+    },
+    "data": {
+      "byte_count": 576000,
+      "frame_count": 48000
+    },
+    "ixml": {
+      "track_list": [
+        {
+          "channel_index": "1",
+          "interleave_index": "1",
+          "name": "",
+          "function": "ACN0-FOA"
         },
-        "data": {
-        "byte_count": 1441434,
-        "frame_count": 240239
+        {
+          "channel_index": "2",
+          "interleave_index": "2",
+          "name": "",
+          "function": "ACN1-FOA"
         },
-        "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
+        {
+          "channel_index": "3",
+          "interleave_index": "3",
+          "name": "",
+          "function": "ACN2-FOA"
         },
-        "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
+        {
+          "channel_index": "4",
+          "interleave_index": "4",
+          "name": "",
+          "function": "ACN3-FOA"
         }
+      ],
+      "project": "wavinfo Test Project",
+      "scene": null,
+      "take": null,
+      "tape": null,
+      "family_uid": "E5DDE719B9484A758162FF7B652383A3",
+      "family_name": null
+    },
+    "bext": {
+      "description": "wavinfo Test Project Nuendo output",
+      "originator": "Nuendo",
+      "originator_ref": "USJPHNNNNNNNNN202829RRRRRRRRR",
+      "originator_date": "2022-12-02",
+      "originator_time": "10:21:06",
+      "time_reference": 172800000,
+      "version": 2,
+      "umid": "base64:k/zr4qE4RiaXyd/fO7GuCwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==",
+      "coding_history": "A=PCM,F=48000,W=24,T=Nuendo\r\n",
+      "loudness_value": 327.67,
+      "loudness_range": 327.67,
+      "max_true_peak": 327.67,
+      "max_momentary_loudness": 327.67,
+      "max_shortterm_loudness": 327.67
     }
-    }
+  }
+}
 

docs/source/conf.py

@@ -12,24 +12,25 @@
 # 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 importlib
 import os
 import sys
 sys.path.insert(0, os.path.abspath('../..'))
 sys.path.insert(0, os.path.abspath("../../.."))
 print(sys.path)
 
-import wavinfo
+import importlib
 
 # -- Project information -----------------------------------------------------
 
 project = u'wavinfo'
-copyright = u'2018-2023, Jamie Hardt'
+copyright = u'2018-2024, Jamie Hardt'
 author = u'Jamie Hardt'
 
 # The short X.Y version
-version = wavinfo.__short_version__
+version = "3.1"
 # The full version, including alpha/beta/rc tags
-release = wavinfo.__version__
+release = importlib.metadata.version("wavinfo")
 
 
 # -- General configuration ---------------------------------------------------

docs/source/references.rst

@@ -36,6 +36,11 @@ iXML
 * `Gallery Software iXML Specification <http://www.gallery.co.uk/ixml/>`_
 
 
+Sampler Metadata
+----------------
+
+* `RecordingBlogs.com — Sample chunk (of a Wave file) <https://www.recordingblogs.com/wiki/sample-chunk-of-a-wave-file>`_
+
 RIFF Metadata
 -------------
 * `1991. Multimedia Programming Interface and Data Specifications 1.0 <https://www.aelius.com/njh/wavemetatools/doc/riffmci.pdf>`_

docs/source/scopes/smpl.rst

@@ -0,0 +1,14 @@
+
+Sampler Metadata
+=================
+
+Class Reference
+---------------
+
+.. automodule:: wavinfo.wave_smpl_reader
+
+.. autoclass:: wavinfo.wave_smpl_reader.WavSmplReader
+    :members:
+
+.. autoclass:: wavinfo.wave_smpl_reader.WaveSmplLoop
+    :members:

examples/demo.ipynb

@@ -46,6 +46,7 @@
     "  * `adm`: EBU Audio Defintion Model metadata, as used by Dolby Atmos.\n",
     "  * `cues`: Cue marker metadata, including labels and notes \n",
     "  * `dolby`: Dolby recorder and playback metadata\n",
+    "  * `smpl`: Sampler midi note and loop metadata\n",
     "\n",
     "Each of these is an attribute of a `WavInfoReader` object.\n",
     "\n",
@@ -304,7 +305,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.5"
+   "version": "3.12.5"
   }
  },
  "nbformat": 4,

pyproject.toml

@@ -1,13 +1,16 @@
-[build-system]
-requires = ["flit_core >=3.2,<4"]
-build-backend = "flit_core.buildapi"
+# https://python-poetry.org/docs/pyproject/
 
-[project]
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.poetry]
 name = "wavinfo"
-authors = [{name = "Jamie Hardt", email = "jamiehardt@me.com"}]
+version = "3.1.0"
+description = "Probe WAVE files for all metadata"
+authors = ["Jamie Hardt <jamiehardt@me.com>"]
+license = "MIT" 
 readme = "README.md"
-dynamic = ["version", "description"]
-requires-python = "~=3.8"
 classifiers = [
     'Development Status :: 5 - Production/Stable',
     'License :: OSI Approved :: MIT License',
@@ -20,9 +23,10 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13"
 ]
-dependencies = [
-    "lxml ~= 5.3.0"
-]
+homepage = "https://github.com/iluvcapra/wavinfo"
+repository = "https://github.com/iluvcapra/wavinfo.git"
+documentation = "https://wavinfo.readthedocs.io/"
+urls.Tracker = 'https://github.com/iluvcapra/wavinfo/issues' 
 keywords = [
     'waveform', 
     'metadata', 
@@ -35,29 +39,17 @@ keywords = [
     'broadcast' 
 ]
 
-[tool.flit.module]
-name = "wavinfo"
+[tool.poetry.extras]
+doc = ['sphinx', 'sphinx_rtd_theme']
 
-[project.optional-dependencies]
-doc = [
-    'sphinx >= 5.3.0',
-    'sphinx_rtd_theme >= 1.1.1',
-]
-
-[project.urls]
-Home = "https://github.com/iluvcapra/wavinfo"
-Documentation = "https://wavinfo.readthedocs.io/"
-Source = "https://github.com/iluvcapra/wavinfo.git"
-Issues = 'https://github.com/iluvcapra/wavinfo/issues' 
-
-[project.entry_points.console_scripts]
+[tool.poetry.scripts]
 wavinfo = 'wavinfo.__main__:main'
 
-[project.scripts]
-wavinfo = "wavinfo.__main__:main"
-
-[tool.flit.external-data]
-directory = "data"
+[tool.poetry.dependencies]
+python = "^3.8"
+lxml = "~= 5.3.0"
+sphinx_rtd_theme = {version= '>= 1.1.1', optional=true}
+sphinx = {version= '>= 5.3.0', optional=true}
 
 [tool.pyright]
 typeCheckingMode = "basic"

tests/test_smpl.py

@@ -0,0 +1,15 @@
+from unittest import TestCase
+from glob import glob
+
+import wavinfo
+
+class TestSmpl(TestCase):
+    def setUp(self) -> None:
+        self.test_files = glob("tests/test_files/smpl/*.wav")
+        return super().setUp()
+
+    def test_each(self):
+        for file in self.test_files:
+            w = wavinfo.WavInfoReader(file)
+            d = w.walk()
+            self.assertIsNotNone(d)

wavinfo/__init__.py

@@ -4,6 +4,3 @@ Probe WAVE Files for iXML, Broadcast-WAVE and other metadata.
 
 from .wave_reader import WavInfoReader
 from .riff_parser import WavInfoEOFError
-
-__version__ = '3.0.0'
-__short_version__ = '3.0.0'

wavinfo/__main__.py

@@ -1,17 +1,24 @@
-import datetime
 from . import WavInfoReader
-from . import __version__
 
+import datetime
 from optparse import OptionParser
 import sys
+import os
 import json
 from enum import Enum
+import importlib.metadata
+from base64 import b64encode
+from cmd import Cmd
+from shlex import split
+from typing import List, Dict, Union
 
 
 class MyJSONEncoder(json.JSONEncoder):
     def default(self, o):
         if isinstance(o, Enum):
             return o._name_
+        elif isinstance(o, bytes):
+            return 'base64:' + b64encode(o).decode('ascii')
         else:
             return super().default(o)
 
@@ -20,11 +27,102 @@ class MissingDataError(RuntimeError):
     pass
 
 
+class MetaBrowser(Cmd):
+    prompt = "(wavinfo) "
+
+    metadata: Union[List, Dict]
+    path: List[str] = []
+
+    @property
+    def cwd(self):
+        root: List | Dict = self.metadata
+        for key in self.path:
+            if isinstance(root, list):
+                root = root[int(key)]
+            else:
+                root = root[key]
+
+        return root
+
+    @staticmethod
+    def print_value(collection, key):
+        val = collection[key]
+        if isinstance(val, int):
+            print(f" - {key}: {val}")
+        elif isinstance(val, str):
+            print(f" - {key}: \"{val}\"")
+        elif isinstance(val, dict):
+            print(f" - {key}: Dict ({len(val)} keys)")
+        elif isinstance(val, list):
+            print(f" - {key}: List ({len(val)} keys)")
+        elif isinstance(val, bytes):
+            print(f" - {key}: ({len(val)} bytes)")
+        elif val is None:
+            print(f" - {key}: (NO VALUE)")
+        else:
+            print(f" - {key}: Unknown")
+
+    def do_ls(self, _):
+        'List items at the current node: LS'
+        root = self.cwd
+
+        if isinstance(root, list):
+            print("List:")
+            for i in range(len(root)):
+                self.print_value(root, i)
+
+        elif isinstance(root, dict):
+            print("Dictionary:")
+            for key in root:
+                self.print_value(root, key)
+
+        else:
+            print("Cannot print node, is not a list or dictionary.")
+
+    def do_cd(self, args):
+        'Switch to a different node: CD node-name | ".."'
+        argv = split(args)
+        if argv[0] == "..":
+            self.path = self.path[0:-1]
+        else:
+            if isinstance(self.cwd, list):
+                if int(argv[0]) < len(self.cwd):
+                    self.path = self.path + [argv[0]]
+                else:
+                    print(f"Index {argv[0]} does not exist")
+            elif isinstance(self.cwd, dict):
+                if argv[0] in self.cwd.keys():
+                    self.path = self.path + [argv[0]]
+                else:
+                    print(f"Key \"{argv[0]}\" does not exist")
+
+        if len(self.path) > 0:
+            self.prompt = "(" + "/".join(self.path) + ") "
+        else:
+            self.prompt = "(wavinfo) "
+
+    def do_bye(self, _):
+        'Exit the interactive browser: BYE'
+        return True
+
+
 def main():
+    version = importlib.metadata.version('wavinfo')
+    manpath = os.path.dirname(__file__) + "/man"
     parser = OptionParser()
 
     parser.usage = 'wavinfo (--adm | --ixml) <FILE> +'
 
+    # parser.add_option('--install-manpages',
+    #                   help="Install manual pages for wavinfo",
+    #                   default=False,
+    #                   action='store_true')
+
+    parser.add_option('--man',
+                      help="Read the manual and exit.",
+                      default=False,
+                      action='store_true')
+
     parser.add_option('--adm', dest='adm',
                       help='Output ADM XML',
                       default=False,
@@ -35,7 +133,34 @@ def main():
                       default=False,
                       action='store_true')
 
+    parser.add_option('-i',
+                      help='Read metadata with an interactive prompt',
+                      default=False,
+                      action='store_true')
+
     (options, args) = parser.parse_args(sys.argv)
+
+    interactive_dict = []
+
+    # if options.install_manpages:
+    #     print("Installing manpages...")
+    #     print(f"Docfiles at {__file__}")
+    #     return
+
+    if options.man:
+        import shlex
+        print("Which man page?")
+        print("1) wavinfo usage")
+        print("7) General info on Wave file metadata")
+        m = input("?> ")
+
+        args = ["man", "-M", manpath, "1", "wavinfo"]
+        if m.startswith("7"):
+            args[3] = "7"
+
+        os.system(shlex.join(args))
+        return
+
     for arg in args[1:]:
         try:
             this_file = WavInfoReader(path=arg)
@@ -53,16 +178,21 @@ def main():
                 ret_dict = {
                     'filename': arg,
                     'run_date': datetime.datetime.now().isoformat(),
-                    'application': "wavinfo " + __version__,
+                    'application': f"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
 
-                json.dump(ret_dict, cls=MyJSONEncoder, fp=sys.stdout, indent=2)
+                if options.i:
+                    interactive_dict.append(ret_dict)
+                else:
+                    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)
@@ -70,6 +200,11 @@ def main():
         except Exception as e:
             raise e
 
+        if len(interactive_dict) > 0:
+            cli = MetaBrowser()
+            cli.metadata = interactive_dict
+            cli.cmdloop()
+
 
 if __name__ == "__main__":
     main()

wavinfo/man/man1/wavinfo.1

@@ -3,6 +3,7 @@
 wavinfo \- probe wave files for metadata
 .SH SYNOPSIS
 .SY wavinfo
+.I "[\-i]"
 .I "[\-\-adm]"
 .I "[\-\-ixml]"
 .I FILE ...
@@ -17,13 +18,17 @@ With no options,
 will emit a JSON (Javascript Object Notation) object containing all 
 detected metadata.
 .IP "\-\-adm"
-Output any Audio Definition Model (ADM) metadata in 
+Output Audio Definition Model (ADM) XML metadata in 
 .BR FILE .
 .IP "\-\-ixml"
 Output any iXML metdata in 
 .BR FILE .
 .IP "\-h, \-\-help"
 Print brief help.
+.IP "\-i"
+Enter 
+.I "interactive mode"
+and browse metadata in FILE with an interactive command prompt.
 .SH DETAILED DESCRIPTION
 .B wavinfo 
 collects metadata according to different 

wavinfo/wave_bext_reader.py

@@ -89,7 +89,7 @@ class WavBextReader:
         #     umid_str = umid_parsed.basic_umid_to_str()
         # else:
 
-        umid_str = None
+        # umid_str = None
 
         return {'description': self.description,
                 'originator': self.originator,
@@ -98,7 +98,7 @@ class WavBextReader:
                 'originator_time': self.originator_time,
                 'time_reference': self.time_reference,
                 'version': self.version,
-                'umid': umid_str,
+                'umid': self.umid,
                 'coding_history': self.coding_history,
                 'loudness_value': self.loudness_value,
                 'loudness_range': self.loudness_range,

wavinfo/wave_reader.py

@@ -5,6 +5,7 @@ from typing import Optional, Generator, Any, NamedTuple
 
 import pathlib
 
+
 from .riff_parser import parse_chunk, ChunkDescriptor, ListChunkDescriptor
 from .wave_ixml_reader import WavIXMLFormat
 from .wave_bext_reader import WavBextReader
@@ -12,9 +13,11 @@ from .wave_info_reader import WavInfoChunkReader
 from .wave_adm_reader import WavADMReader
 from .wave_dbmd_reader import WavDolbyMetadataReader
 from .wave_cues_reader import WavCuesReader
-
+from .wave_smpl_reader import WavSmplReader
 
 #: Calculated statistics about the audio data.
+
+
 class WavDataDescriptor(NamedTuple):
     byte_count: int
     frame_count: int
@@ -80,6 +83,9 @@ class WavInfoReader:
         #: RIFF cues markers, labels, and notes.
         self.cues: Optional[WavCuesReader] = None
 
+        #: Sampler `smpl` metadata
+        self.smpl: Optional[WavSmplReader] = None
+
         if hasattr(path, 'read'):
             self.get_wav_info(path)
             self.url = 'about:blank'
@@ -110,6 +116,7 @@ class WavInfoReader:
         self.info = self._get_info(wavfile, encoding=self.info_encoding)
         self.dolby = self._get_dbmd(wavfile)
         self.cues = self._get_cue(wavfile)
+        self.smpl = self._get_sampler_loops(wavfile)
         self.data = self._describe_data()
 
     def _find_chunk_data(self, ident, from_stream,
@@ -203,6 +210,10 @@ class WavInfoReader:
         return WavCuesReader.read_all(f, cue, labls, ltxts, notes,
                                       fallback_encoding=self.info_encoding)
 
+    def _get_sampler_loops(self, f):
+        sampler_data = self._find_chunk_data(b'smpl', f, default_none=True)
+        return WavSmplReader(sampler_data) if sampler_data else None
+
     # FIXME: this should probably be named "iter()"
     def walk(self) -> Generator[str, str, Any]:
         """
@@ -210,11 +221,12 @@ class WavInfoReader:
 
         :yields: tuples of the *scope*, *key*, and *value* of
             each metadatum. The *scope* value will be one of
-            "fmt", "data", "ixml", "bext", "info", "dolby", "cues" or "adm".
+            "fmt", "data", "ixml", "bext", "info", "dolby", "cues", "adm" or
+            "smpl".
         """
 
         scopes = ('fmt', 'data', 'ixml', 'bext', 'info', 'adm', 'cues',
-                  'dolby')
+                  'dolby', 'smpl')
 
         for scope in scopes:
             if scope in ['fmt', 'data']:
@@ -223,10 +235,10 @@ class WavInfoReader:
                     yield scope, field, attr.__getattribute__(field)
 
             else:
-                dict = self.__getattribute__(scope).to_dict(
+                mdict = self.__getattribute__(scope).to_dict(
                 ) if self.__getattribute__(scope) else {}
-                for key in dict.keys():
-                    yield scope, key, dict[key]
+                for key in mdict.keys():
+                    yield scope, key, mdict[key]
 
     def __repr__(self):
         return 'WavInfoReader({}, {}, {})'.format(self.path,

wavinfo/wave_smpl_reader.py

@@ -0,0 +1,114 @@
+import struct
+
+from typing import Tuple, NamedTuple, List
+
+
+class WaveSmplLoop(NamedTuple):
+    ident: int
+    loop_type: int
+    start: int
+    end: int
+    detune_cents: int
+    repetition_count: int
+
+    def loop_type_desc(self):
+        if self.loop_type == 0:
+            return 'FORWARD'
+        elif self.loop_type == 1:
+            return 'FORWARD_BACKWARD'
+        elif self.loop_type == 2:
+            return 'BACKWARD'
+        elif 3 <= self.loop_type <= 31:
+            return 'RESERVED'
+        else:
+            return 'VENDOR'
+
+    def to_dict(self):
+        return {
+            'ident': self.ident,
+            'loop_type': self.loop_type,
+            'loop_type_description': self.loop_type_desc(),
+            'start_samples': self.start,
+            'end_samples': self.end,
+            'detune_cents': self.detune_cents,
+            'repetition_count': self.repetition_count,
+        }
+
+
+class WavSmplReader:
+
+    def __init__(self, smpl_data: bytes):
+        """
+        Read sampler metadata from smpl chunk.
+        """
+
+        header_field_fmt = "<IIIIiIbbbbII"
+        loop_field_fmt = "<IIIIiI"
+        header_size = struct.calcsize(header_field_fmt)
+        loop_size = struct.calcsize(loop_field_fmt)
+
+        unpacked_data = struct.unpack(header_field_fmt,
+                                      smpl_data[0:header_size])
+
+        #: The MIDI Manufacturer's Association code for the sampler
+        #: manufactuer, or 0 if not specific.
+        self.manufacturer: int = unpacked_data[0]
+
+        #: The manufacturer-assigned code for their specific sampler model, or
+        #: 0 if not specific.
+        self.product: int = unpacked_data[1]
+
+        #: The number of nanoseconds in one audio frame.
+        self.sample_period_ns: int = unpacked_data[2]
+
+        #: The MIDI note number for the loops in this sample
+        self.midi_note: int = unpacked_data[3]
+
+        #: The number of semitones above the MIDI note the loops tune for.
+        self.midi_pitch_detune_cents: int = unpacked_data[4]
+
+        #: SMPTE timecode format, one of (0, 24, 25, 29, 30)
+        self.smpte_format: int = unpacked_data[5]
+
+        #: The SMPTE offset to apply, as a tuple of four ints representing
+        #: hh, mm, ss, ff
+        self.smpte_offset: Tuple[int, int, int, int] = unpacked_data[6:10]
+
+        loop_count = unpacked_data[10]
+        sampler_udata_length = unpacked_data[11]
+
+        #: List of loops in the file.
+        self.sample_loops: List[WaveSmplLoop] = []
+
+        loop_buffer = smpl_data[header_size:
+                                header_size + loop_size * loop_count]
+
+        for unpacked_loop in struct.iter_unpack(loop_field_fmt, loop_buffer):
+            self.sample_loops.append(WaveSmplLoop(
+                ident=unpacked_loop[0],
+                loop_type=unpacked_loop[1],
+                start=unpacked_loop[2],
+                end=unpacked_loop[3],
+                detune_cents=unpacked_loop[4],
+                repetition_count=unpacked_loop[5]))
+
+        #: Sampler-specific user data.
+        self.sampler_udata: bytes | None = None
+
+        if sampler_udata_length > 0:
+            self.sampler_udata = smpl_data[
+                header_size + loop_size * loop_count:
+                header_size + loop_size * loop_count + sampler_udata_length]
+
+    def to_dict(self):
+        return {
+            'manufactuer': self.manufacturer,
+            'product': self.product,
+            'sample_period_ns': self.sample_period_ns,
+            'midi_note': self.midi_note,
+            'midi_pitch_detune_cents': self.midi_pitch_detune_cents,
+            'smpte_format': self.smpte_format,
+            'smpte_offset': "%02i:%02i:%02i:%02i" % self.smpte_offset,
+            'loops': [x.to_dict() for x in self.sample_loops],
+            'sampler_user_data': self.sampler_udata,
+        }