feat(analyzer): parse comment fields from mp3 files (#3082)

### Description

Upload comments from mp3 files into libretime `comments` and
`description` fields.

**This is a new feature**:

Yes

**I have updated the documentation to reflect these changes**:

No none required

### Testing Notes

**What I did:**

I uploaded tracks that contained comments into LibreTime and checked the
database to ensure that the `comments` and `description` fields were
correctly populated. I then went to the UI and confirmed that the
description field had the MP3 comment in it inside of the metadata
editor. I then uploaded some files that did not have comments to make
sure I did not break any existing functionality.

**How you can replicate my testing:**

Follow the steps in what I did

### **Links**

Fixes #526

---------

Co-authored-by: Kyle Robbertze <paddatrapper@users.noreply.github.com>

analyzer/libretime_analyzer/pipeline/analyze_metadata.py

@@ -5,10 +5,24 @@ from typing import Any, Dict
 
 import mutagen
 from libretime_shared.files import compute_md5
+from mutagen.easyid3 import EasyID3
 
 logger = logging.getLogger(__name__)
 
 
+def flatten(xss):
+    return [x for xs in xss for x in xs]
+
+
+def comment_get(id3, _):
+    comments = [v.text for k, v in id3.items() if "COMM" in k or "comment" in k]
+
+    return flatten(comments)
+
+
+EasyID3.RegisterKey("comment", comment_get)
+
+
 def analyze_metadata(filepath_: str, metadata: Dict[str, Any]):
     """
     Extract audio metadata from tags embedded in the file using mutagen.
@@ -71,34 +85,36 @@ def analyze_metadata(filepath_: str, metadata: Dict[str, Any]):
     except (AttributeError, KeyError, IndexError):
         pass
 
-    extracted_tags_mapping = {
-        "title": "track_title",
-        "artist": "artist_name",
-        "album": "album_title",
-        "bpm": "bpm",
-        "composer": "composer",
-        "conductor": "conductor",
-        "copyright": "copyright",
-        "comment": "comment",
-        "encoded_by": "encoder",
-        "genre": "genre",
-        "isrc": "isrc",
-        "label": "label",
-        "organization": "label",
-        # "length": "length",
-        "language": "language",
-        "last_modified": "last_modified",
-        "mood": "mood",
-        "bit_rate": "bit_rate",
-        "replay_gain": "replaygain",
-        # "tracknumber": "track_number",
-        # "track_total": "track_total",
-        "website": "website",
-        "date": "year",
-        # "mime_type": "mime",
-    }
+    extracted_tags_mapping = [
+        ("title", "track_title"),
+        ("artist", "artist_name"),
+        ("album", "album_title"),
+        ("bpm", "bpm"),
+        ("composer", "composer"),
+        ("conductor", "conductor"),
+        ("copyright", "copyright"),
+        ("comment", "comment"),
+        ("comment", "comments"),
+        ("comment", "description"),
+        ("encoded_by", "encoder"),
+        ("genre", "genre"),
+        ("isrc", "isrc"),
+        ("label", "label"),
+        ("organization", "label"),
+        # ("length", "length"),
+        ("language", "language"),
+        ("last_modified", "last_modified"),
+        ("mood", "mood"),
+        ("bit_rate", "bit_rate"),
+        ("replay_gain", "replaygain"),
+        # ("tracknumber", "track_number"),
+        # ("track_total", "track_total"),
+        ("website", "website"),
+        ("date", "year"),
+        # ("mime_type", "mime"),
+    ]
 
-    for extracted_key, metadata_key in extracted_tags_mapping.items():
+    for extracted_key, metadata_key in extracted_tags_mapping:
         try:
             metadata[metadata_key] = extracted[extracted_key]
             if isinstance(metadata[metadata_key], list):

analyzer/tests/fixtures/__init__.py

@@ -96,12 +96,18 @@ tags = {
     "comment": "Test Comment",
 }
 
+mp3Tags = {
+    **tags,
+    "comments": tags["comment"],
+    "description": tags["comment"],
+}
+
 FILES_TAGGED = [
     FixtureMeta(
         here / "s1-jointstereo-tagged.mp3",
         {
             **meta,
-            **tags,
+            **mp3Tags,
             "bit_rate": approx(128000, abs=1e2),
             "channels": 2,
             "mime": "audio/mp3",
@@ -111,7 +117,7 @@ FILES_TAGGED = [
         here / "s1-mono-tagged.mp3",
         {
             **meta,
-            **tags,
+            **mp3Tags,
             "bit_rate": approx(64000, abs=1e2),
             "channels": 1,
             "mime": "audio/mp3",
@@ -121,7 +127,7 @@ FILES_TAGGED = [
         here / "s1-stereo-tagged.mp3",
         {
             **meta,
-            **tags,
+            **mp3Tags,
             "bit_rate": approx(128000, abs=1e2),
             "channels": 2,
             "mime": "audio/mp3",
@@ -151,7 +157,7 @@ FILES_TAGGED = [
         here / "s1-mono-tagged.m4a",
         {
             **meta,
-            **tags,
+            **mp3Tags,
             "bit_rate": approx(65000, abs=5e4),
             "channels": 2,  # Weird
             "mime": "audio/mp4",
@@ -161,7 +167,7 @@ FILES_TAGGED = [
         here / "s1-stereo-tagged.m4a",
         {
             **meta,
-            **tags,
+            **mp3Tags,
             "bit_rate": approx(128000, abs=1e5),
             "channels": 2,
             "mime": "audio/mp4",
@@ -228,12 +234,18 @@ tags = {
     "comment": "Ł Ą Ż Ę Ć Ń Ś Ź",
 }
 
+mp3Tags = {
+    **tags,
+    "comments": tags["comment"],
+    "description": tags["comment"],
+}
+
 FILES_TAGGED += [
     FixtureMeta(
         here / "s1-jointstereo-tagged-utf8.mp3",
         {
             **meta,
-            **tags,
+            **mp3Tags,
             "bit_rate": approx(128000, abs=1e2),
             "channels": 2,
             "mime": "audio/mp3",
@@ -243,7 +255,7 @@ FILES_TAGGED += [
         here / "s1-mono-tagged-utf8.mp3",
         {
             **meta,
-            **tags,
+            **mp3Tags,
             "bit_rate": approx(64000, abs=1e2),
             "channels": 1,
             "mime": "audio/mp3",
@@ -253,7 +265,7 @@ FILES_TAGGED += [
         here / "s1-stereo-tagged-utf8.mp3",
         {
             **meta,
-            **tags,
+            **mp3Tags,
             "bit_rate": approx(128000, abs=1e2),
             "channels": 2,
             "mime": "audio/mp3",
@@ -283,7 +295,7 @@ FILES_TAGGED += [
         here / "s1-mono-tagged-utf8.m4a",
         {
             **meta,
-            **tags,
+            **mp3Tags,
             "bit_rate": approx(65000, abs=5e4),
             "channels": 2,  # Weird
             "mime": "audio/mp4",
@@ -293,7 +305,7 @@ FILES_TAGGED += [
         here / "s1-stereo-tagged-utf8.m4a",
         {
             **meta,
-            **tags,
+            **mp3Tags,
             "bit_rate": approx(128000, abs=1e5),
             "channels": 2,
             "mime": "audio/mp4",

analyzer/tests/pipeline/analyze_metadata_test.py

@@ -27,8 +27,8 @@ def test_analyze_metadata(filepath: Path, metadata: dict):
     del metadata["length"]
     del found["length"]
 
-    # mp3,ogg,flac files does not support comments yet
-    if not filepath.suffix == ".m4a":
+    # ogg,flac files does not support comments yet
+    if not filepath.suffix == ".m4a" and not filepath.suffix == ".mp3":
         if "comment" in metadata:
             del metadata["comment"]