src/youtube/models.py

   1 import io
   2 from os import unlink
   3 from tempfile import NamedTemporaryFile
   4 from django.db import models
   5 from django.utils.translation import gettext_lazy as _
   6 from django.template import Template, Context
   7 from apiclient import youtube_call
   8 from .utils import (
   9     concat_audio,
  10     concat_videos,
  11     cut_video,
  12     get_duration,
  13     get_framerate,
  14     mux,
  15     standardize_video,
  16     video_from_image,
  17 )
  18 from .thumbnail import create_thumbnail
  19
  20
  21 class YouTube(models.Model):
  22     title_template = models.CharField(max_length=1024, blank=True)
  23     description_template = models.TextField(blank=True)
  24     category = models.IntegerField(null=True, blank=True, choices=[
  25         (27, 'Edukacja'),
  26     ])
  27     intro_flac = models.FileField(upload_to='youtube/intro_flac', blank=True)
  28     outro_flac = models.FileField(upload_to='youtube/outro_flac', blank=True)
  29     loop_card = models.FileField(upload_to='youtube/card', blank=True)
  30     loop_video = models.FileField(upload_to='youtube/loop_video', blank=True)
  31     thumbnail_template = models.FileField(upload_to='youtube/thumbnail', blank=True)
  32     thumbnail_definition = models.TextField(blank=True)
  33     privacy_status = models.CharField(max_length=16, choices=[
  34         ('public', _('public')),
  35         ('unlisted', _('unlisted')),
  36         ('private', _('private')),
  37     ])
  38     genres = models.CharField(max_length=2048, blank=True)
  39
  40     class Meta:
  41         verbose_name = _("YouTube configuration")
  42         verbose_name_plural = _("YouTube configurations")
  43
  44     def get_context(self, audiobook):
  45         return Context(dict(audiobook=audiobook))
  46
  47     def get_description(self, audiobook):
  48         return Template(self.description_template).render(self.get_context(audiobook))
  49
  50     def get_title(self, audiobook):
  51         return Template(self.title_template).render(self.get_context(audiobook))
  52
  53     def get_data(self, audiobook):
  54         return dict(
  55             snippet=dict(
  56                 title=self.get_title(audiobook),
  57                 description=self.get_description(audiobook),
  58                 categoryId=self.category,
  59                 defaultLanguage='pl'
  60             ),
  61             status=dict(
  62                 privacyStatus=self.privacy_status,
  63             ),
  64         )
  65
  66     def publish(self, audiobook, path):
  67         data = self.get_data(audiobook)
  68         part = ",".join(data.keys())
  69
  70         with open(path, "rb") as f:
  71             response = youtube_call(
  72                 "POST",
  73                 "https://www.googleapis.com/upload/youtube/v3/videos",
  74                 params={'part': part},
  75                 json=data,
  76                 resumable_data=f.read(),
  77             )
  78         data = response.json()
  79         audiobook.youtube_id = data['id']
  80         audiobook.save(update_fields=['youtube_id'])
  81
  82         self.update_thumbnail(audiobook)
  83         return response
  84
  85     def update_data(self, audiobook):
  86         data = self.get_data(audiobook)
  87         data['id'] = audiobook.youtube_id
  88         part = ",".join(data.keys())
  89         youtube_call(
  90             "PUT",
  91             "https://www.googleapis.com/youtube/v3/videos",
  92             params={"part": part},
  93             json=data
  94         )
  95
  96     def prepare_file(self, input_path, output_path=None):
  97         audio = self.prepare_audio(input_path)
  98         duration = self.get_duration(input_path)
  99         video = self.prepare_video(duration)
 100         output = mux([video, audio], output_path=output_path)
 101         unlink(audio)
 102         unlink(video)
 103         return output
 104
 105     def get_duration(self, input_path):
 106         d = get_duration(input_path)
 107         if self.intro_flac:
 108             d += get_duration(self.intro_flac.path)
 109         if self.outro_flac:
 110             d += get_duration(self.outro_flac.path)
 111         return d
 112
 113     def prepare_audio(self, input_path):
 114         files = []
 115         if self.intro_flac:
 116             files.append(self.intro_flac.path)
 117         files.append(input_path)
 118         if self.outro_flac:
 119             files.append(self.outro_flac.path)
 120         return concat_audio(files)
 121
 122     def prepare_video(self, duration):
 123         concat = []
 124         outro = []
 125         delete = []
 126
 127         if self.loop_video:
 128             fps = get_framerate(self.loop_video.path)
 129             loop_video = standardize_video(self.loop_video.path)
 130         else:
 131             fps = 25
 132
 133         loop_duration = duration
 134         for card in self.card_set.filter(duration__gt=0):
 135             loop_duration -= card.duration
 136             card_video = video_from_image(
 137                 card.image.path, card.duration, fps=fps
 138             )
 139             (concat if card.order < 0 else outro).append(card_video)
 140             delete.append(card_video)
 141
 142         if self.loop_video:
 143             loop_video_duration = get_duration(loop_video)
 144             times_loop = int(loop_duration // loop_video_duration)
 145
 146             leftover_duration = loop_duration % loop_video_duration
 147             leftover = cut_video(loop_video, leftover_duration)
 148             concat.extend([loop_video] * times_loop + [leftover])
 149             delete.append(leftover)
 150         else:
 151             leftover = video_from_image(self.loop_card.path, loop_duration)
 152             concat.append(video_from_image(self.loop_card.path, loop_duration, fps=fps))
 153             delete.append(leftover)
 154         concat.extend(outro)
 155
 156         output = concat_videos(concat)
 157         for p in delete:
 158             unlink(p)
 159         unlink(loop_video)
 160         return output
 161
 162     # tags
 163     # license
 164     # selfDeclaredMadeForKids
 165
 166     def update_thumbnail(self, audiobook):
 167         thumbnail = self.prepare_thumbnail(audiobook)
 168         response = youtube_call(
 169             "POST",
 170             "https://www.googleapis.com/upload/youtube/v3/thumbnails/set",
 171             params={'videoId': audiobook.youtube_id},
 172             data=thumbnail.getvalue(),
 173         )
 174
 175     def prepare_thumbnail(self, audiobook):
 176         img = create_thumbnail(
 177             self.thumbnail_template.path,
 178             self.thumbnail_definition,
 179             {
 180                 "author": ', '.join((a['name'] for a in audiobook.book['authors'])),
 181                 "title": audiobook.book['title'],
 182             },
 183             lambda name: Font.objects.get(name=name).truetype.path
 184         )
 185         buf = io.BytesIO()
 186         img.save(buf, format='PNG')
 187         return buf
 188
 189
 190 class Card(models.Model):
 191     youtube = models.ForeignKey(YouTube, models.CASCADE)
 192     order = models.SmallIntegerField()
 193     image = models.FileField(upload_to='youtube/card')
 194     duration = models.FloatField()
 195
 196     class Meta:
 197         ordering = ('order', )
 198
 199
 200 class Font(models.Model):
 201     name = models.CharField(max_length=255, unique=True)
 202     truetype = models.FileField(upload_to='youtube/font')
 203
 204     def __str__(self):
 205         return self.name