Add replaygain support.

contrib/djcontrol/djcontrol.py

@@ -26,7 +26,14 @@ HEADERS = {
     'Authorization': 'Token {}'.format(DJ_TOKEN)
 }
 
-ANNOTATE = 'annotate:req_id="{}",type="{}",artist="{}",title="{}",game="{}":{}'
+ANNOTATE = (
+    'annotate:req_id="{}",'
+    'type="{}",'
+    'artist="{}",'
+    'title="{}",'
+    'game="{}",'
+    'replay_gain="{}":{}'
+)
 
 logging.basicConfig(
         handlers=[
@@ -93,11 +100,12 @@ def next_request():
             title = clean_quotes(song['title'])
             game = clean_quotes(song['game'])
         LOGGER.info(
-            'Req_ID: %s, Artist[s]: %s, Title: %s, Game: %s, Path: %s',
+            'ID: %s, Artist[s]: %s, Title: %s, Game: %s, Gain: %s, Path: %s',
             song_request['id'],
             artist,
             title,
             game,
+            song['replaygain'],
             song['path']
         )
         annotate_string = ANNOTATE.format(
@@ -106,6 +114,7 @@ def next_request():
             artist,
             title,
             game,
+            song['replaygain'],
             song['path']
         )
         LOGGER.debug(annotate_string)

savepointradio/api/serializers/radio.py

@@ -1,4 +1,4 @@
-from rest_framework.serializers import (BooleanField, DecimalField,
+from rest_framework.serializers import (BooleanField, CharField, DecimalField,
                                         IntegerField, ListField,
                                         ModelSerializer, Serializer,
                                         SerializerMethodField,
@@ -120,12 +120,13 @@ class RadioSongSerializer(ModelSerializer):
         decimal_places=2,
         source='active_store.length'
     )
+    replaygain = CharField(source='active_store.replaygain')
     path = SerializerMethodField()
 
     class Meta:
         model = Song
         fields = ('album', 'artists', 'game', 'song_type', 'title', 'length',
-                  'path')
+                  'replaygain', 'path')
 
     def get_path(self, obj):
         '''Converts the IRI into a filesystem path.'''

savepointradio/radio/admin.py

@@ -114,14 +114,20 @@ class StoreAdmin(admin.ModelAdmin):
     list_display = ('iri',
                     'mime_type',
                     'file_size',
-                    'length')
+                    'length',
+                    '_replaygain')
     search_fields = ['iri']
 
     # Edit Form display
     readonly_fields = ('created_date', 'modified_date')
     fieldsets = (
         ('Main', {
-            'fields': ('iri', 'mime_type', 'file_size', 'length')
+            'fields': ('iri',
+                       'mime_type',
+                       'file_size',
+                       'length',
+                       'track_gain',
+                       'track_peak')
         }),
         ('Stats', {
             'classes': ('collapse',),

savepointradio/radio/management/commands/importoldradio.py

@@ -101,11 +101,24 @@ class Command(BaseCommand):
             else:
                 iri = song['store']['path']
 
+            if song['store']['track_gain']:
+                gain_str = re.sub(r'[dB\+ ]', '', song['store']['track_gain'])
+                gain = decimal.Decimal(gain_str)
+            else:
+                gain = None
+
+            if song['store']['track_peak']:
+                peak = decimal.Decimal(song['store']['track_peak'])
+            else:
+                peak = None
+
             new_store = Store.objects.create(
                 iri=iri,
                 mime_type=song['store']['mime'],
                 file_size=song['store']['filesize'],
-                length=song['store']['length']
+                length=song['store']['length'],
+                track_gain=gain,
+                track_peak=peak
             )
             new_song.stores.add(new_store)
             new_song.active_store = new_store

savepointradio/radio/migrations/0005_replaygain_data.py

@@ -0,0 +1,23 @@
+# Generated by Django 2.2.2 on 2019-07-03 13:16
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('radio', '0004_new_song_path_structure'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='store',
+            name='track_gain',
+            field=models.DecimalField(blank=True, decimal_places=2, max_digits=6, null=True, verbose_name='recommended replaygain adjustment'),
+        ),
+        migrations.AddField(
+            model_name='store',
+            name='track_peak',
+            field=models.DecimalField(blank=True, decimal_places=6, max_digits=10, null=True, verbose_name='highest volume level in the track'),
+        ),
+    ]

savepointradio/radio/models.py

@@ -117,6 +117,27 @@ class Store(Timestampable, models.Model):
                                  decimal_places=2,
                                  null=True,
                                  blank=True)
+    track_gain = models.DecimalField(_('recommended replaygain adjustment'),
+                                     max_digits=6,
+                                     decimal_places=2,
+                                     null=True,
+                                     blank=True)
+    track_peak = models.DecimalField(_('highest volume level in the track'),
+                                     max_digits=10,
+                                     decimal_places=6,
+                                     null=True,
+                                     blank=True)
+
+    def _replaygain(self):
+        '''
+        String representation of the recommended amplitude adjustment.
+        '''
+        if self.track_gain is None:
+            return '+0.00 dB'
+        if self.track_gain > 0:
+            return '+{} dB'.format(str(self.track_gain))
+        return '{} dB'.format(str(self.track_gain))
+    replaygain = property(_replaygain)
 
     def __str__(self):
         return self.iri