add possibility to request higher quality for some podcasts

emissions/management/commands/create-sound-files.py

@@ -12,6 +12,19 @@ from django.core.management.base import BaseCommand, CommandError
 from ...models import SoundFile
 
 
+def get_bitrate(filename):
+    p = subprocess.Popen(['mediainfo', '--Inform=Audio;%BitRate%', filename],
+                         close_fds=True,
+                         stdin=subprocess.PIPE,
+                         stdout=subprocess.PIPE,
+                         stderr=subprocess.PIPE)
+    stdout, stderr = p.communicate()
+    try:
+        return int(stdout) / 1000
+    except ValueError:
+        return None
+
+
 class Command(BaseCommand):
 
     def add_arguments(self, parser):
@@ -107,11 +120,26 @@ class Command(BaseCommand):
             os.symlink(soundfile.file.path, file_path)
             return
 
+        vorbis_rates = [64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 500]
+        orig_bitrate = get_bitrate(soundfile.file.path)
+        vorbis_q = 5
+        mp3_q = 4
+        if orig_bitrate is not None:
+            if soundfile.episode.emission.podcast_sound_quality == 'high':
+                vorbis_q = 9
+                mp3_q = 9
+            # cap quality to original bitrate (using vorbis quality mapping)
+            for i, rate in enumerate(vorbis_rates):
+                if orig_bitrate < rate:
+                    vorbis_q = min((i, vorbis_q))
+                    mp3_q = min((i, mp3_q))
+                    break
+
         cmd = ['ffmpeg', '-y', '-i', soundfile.file.path]
         if format == 'ogg':
-            cmd.extend(['-q:a', '5'])
+            cmd.extend(['-q:a', str(vorbis_q)])
         elif format == 'mp3':
-            cmd.extend(['-q:a', '4'])
+            cmd.extend(['-q:a', str(mp3_q)])
 
         cmd.append(file_path)
 

emissions/migrations/0015_auto_20200404_1510.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.24 on 2020-04-04 15:10
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('emissions', '0014_auto_20200329_1519'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='emission',
+            name='podcast_sound_quality',
+            field=models.CharField(choices=[('standard', 'Standard'), ('high', 'High')], default='standard', max_length=20, verbose_name='Podcast sound quality'),
+        ),
+        migrations.AlterField(
+            model_name='emission',
+            name='default_license',
+            field=models.CharField(blank=True, choices=[('', 'Unspecified'), ('cc by', 'Creative Commons Attribution'), ('cc by-sa', 'Creative Commons Attribution ShareAlike'), ('cc by-nc', 'Creative Commons Attribution NonCommercial'), ('cc by-nd', 'Creative Commons Attribution NoDerivs'), ('cc by-nc-sa', 'Creative Commons Attribution NonCommercial ShareAlike'), ('cc by-nc-nd', 'Creative Commons Attribution NonCommercial NoDerivs'), ('cc0 / pd', 'Creative Commons Zero / Public Domain'), ('artlibre', 'Art Libre')], default='', max_length=20, verbose_name='Default license for podcasts'),
+        ),
+        migrations.AlterField(
+            model_name='focus',
+            name='current',
+            field=models.BooleanField(default=True, verbose_name='Current'),
+        ),
+        migrations.AlterField(
+            model_name='playlistelement',
+            name='notes',
+            field=models.CharField(blank=True, default='', max_length=200, verbose_name='Notes'),
+        ),
+        migrations.AlterField(
+            model_name='soundfile',
+            name='license',
+            field=models.CharField(blank=True, choices=[('', 'Unspecified'), ('cc by', 'Creative Commons Attribution'), ('cc by-sa', 'Creative Commons Attribution ShareAlike'), ('cc by-nc', 'Creative Commons Attribution NonCommercial'), ('cc by-nd', 'Creative Commons Attribution NoDerivs'), ('cc by-nc-sa', 'Creative Commons Attribution NonCommercial ShareAlike'), ('cc by-nc-nd', 'Creative Commons Attribution NonCommercial NoDerivs'), ('cc0 / pd', 'Creative Commons Zero / Public Domain'), ('artlibre', 'Art Libre')], default='', max_length=20, verbose_name='License'),
+        ),
+    ]

emissions/models.py

@@ -32,6 +32,11 @@ LICENSES = (
     ('artlibre', _('Art Libre')),
 )
 
+PODCAST_SOUND_QUALITY_LIST = (
+    ('standard', _('Standard')),
+    ('high', _('High')),
+)
+
 
 class WeekdayMixin(object):
     DAY_HOUR_START = 5
@@ -131,6 +136,8 @@ class Emission(models.Model):
 
     default_license = models.CharField(_('Default license for podcasts'),
             max_length=20, blank=True, default='', choices=LICENSES)
+    podcast_sound_quality = models.CharField(_('Podcast sound quality'),
+            max_length=20, default='standard', choices=PODCAST_SOUND_QUALITY_LIST)
     email = models.EmailField(_('Email'), max_length=254, null=True, blank=True)
     website = models.URLField(_('Website'), null=True, blank=True)