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_audio,
  16     standardize_video,
  17     video_from_image,
  18 )
  19 from .thumbnail import create_thumbnail
  20
  21
  22 YOUTUBE_TITLE_LIMIT = 100
  23
  24
  25 class YouTube(models.Model):
  26     title_template = models.CharField(max_length=1024, blank=True)
  27     description_template = models.TextField(blank=True)
  28     category = models.IntegerField(null=True, blank=True, choices=[
  29         (27, 'Edukacja'),
  30     ])
  31     intro_flac = models.FileField(upload_to='youtube/intro_flac', blank=True)
  32     outro_flac = models.FileField(upload_to='youtube/outro_flac', blank=True)
  33     loop_card = models.FileField(upload_to='youtube/card', blank=True)
  34     loop_video = models.FileField(upload_to='youtube/loop_video', blank=True)
  35     thumbnail_template = models.FileField(upload_to='youtube/thumbnail', blank=True)
  36     thumbnail_definition = models.TextField(blank=True)
  37     privacy_status = models.CharField(max_length=16, choices=[
  38         ('public', _('public')),
  39         ('unlisted', _('unlisted')),
  40         ('private', _('private')),
  41     ])
  42     genres = models.CharField(max_length=2048, blank=True)
  43
  44     class Meta:
  45         verbose_name = _("YouTube configuration")
  46         verbose_name_plural = _("YouTube configurations")
  47
  48     def get_context(self, audiobook):
  49         return Context(dict(
  50             audiobook=audiobook,
  51         ))
  52
  53     def get_description(self, audiobook):
  54         return Template(self.description_template).render(self.get_context(audiobook))
  55
  56     def get_title(self, audiobook):
  57         return Template(self.title_template).render(self.get_context(audiobook))[:YOUTUBE_TITLE_LIMIT]
  58
  59     def get_data(self, audiobook):
  60         return dict(
  61             snippet=dict(
  62                 title=self.get_title(audiobook),
  63                 description=self.get_description(audiobook),
  64                 categoryId=self.category,
  65                 defaultLanguage='pl',
  66                 defaultAudioLanguage='pl',
  67             ),
  68             status=dict(
  69                 privacyStatus=self.privacy_status,
  70             ),
  71         )
  72
  73     def publish(self, audiobook, path):
  74         data = self.get_data(audiobook)
  75         part = ",".join(data.keys())
  76
  77         response = youtube_call(
  78             "POST",
  79             "https://www.googleapis.com/upload/youtube/v3/videos",
  80             params={'part': part},
  81             json=data,
  82             resumable_file_path=path,
  83         )
  84         data = response.json()
  85         audiobook.youtube_id = data['id']
  86         audiobook.save(update_fields=['youtube_id'])
  87
  88         self.update_thumbnail(audiobook)
  89         return response
  90
  91     def update_data(self, audiobook):
  92         data = self.get_data(audiobook)
  93         data['id'] = audiobook.youtube_id
  94         part = ",".join(data.keys())
  95         youtube_call(
  96             "PUT",
  97             "https://www.googleapis.com/youtube/v3/videos",
  98             params={"part": part},
  99             json=data
 100         )
 101
 102     def prepare_file(self, input_path, output_path=None):
 103         audio = self.prepare_audio(input_path)
 104         duration = self.get_duration(input_path)
 105         video = self.prepare_video(duration)
 106         output = mux([video, audio], output_path=output_path)
 107         unlink(audio)
 108         unlink(video)
 109         return output
 110
 111     def get_duration(self, input_path):
 112         d = get_duration(input_path)
 113         if self.intro_flac:
 114             d += get_duration(self.intro_flac.path)
 115         if self.outro_flac:
 116             d += get_duration(self.outro_flac.path)
 117         return d
 118
 119     def prepare_audio(self, input_path):
 120         files = []
 121         if self.intro_flac:
 122             files.append(standardize_audio(self.intro_flac.path))
 123         files.append(standardize_audio(input_path, cache=False))
 124         if self.outro_flac:
 125             files.append(standardize_audio(self.outro_flac.path))
 126         output = concat_audio(files)
 127         for d in files:
 128             unlink(d)
 129         return output
 130
 131
 132     def prepare_video(self, duration):
 133         concat = []
 134         outro = []
 135         delete = []
 136
 137         if self.loop_video:
 138             fps = get_framerate(self.loop_video.path)
 139             loop_video = standardize_video(self.loop_video.path)
 140         else:
 141             fps = 25
 142
 143         loop_duration = duration
 144         for card in self.card_set.filter(duration__gt=0):
 145             loop_duration -= card.duration
 146             card_video = video_from_image(
 147                 card.image.path, card.duration, fps=fps
 148             )
 149             (concat if card.order < 0 else outro).append(card_video)
 150             delete.append(card_video)
 151
 152         if self.loop_video:
 153             loop_video_duration = get_duration(loop_video)
 154             times_loop = int(loop_duration // loop_video_duration)
 155
 156             leftover_duration = loop_duration % loop_video_duration
 157             leftover = cut_video(loop_video, leftover_duration)
 158             concat.extend([loop_video] * times_loop + [leftover])
 159             delete.append(leftover)
 160         else:
 161             leftover = video_from_image(self.loop_card.path, loop_duration)
 162             concat.append(video_from_image(self.loop_card.path, loop_duration, fps=fps))
 163             delete.append(leftover)
 164         concat.extend(outro)
 165
 166         output = concat_videos(concat)
 167         for p in delete:
 168             unlink(p)
 169         unlink(loop_video)
 170         return output
 171
 172     # tags
 173     # license
 174     # selfDeclaredMadeForKids
 175
 176     def update_thumbnail(self, audiobook):
 177         thumbnail = self.prepare_thumbnail(audiobook)
 178         response = youtube_call(
 179             "POST",
 180             "https://www.googleapis.com/upload/youtube/v3/thumbnails/set",
 181             params={'videoId': audiobook.youtube_id},
 182             data=thumbnail.getvalue(),
 183         )
 184
 185     def prepare_thumbnail(self, audiobook):
 186         img = create_thumbnail(
 187             self.thumbnail_template.path,
 188             self.thumbnail_definition,
 189             {
 190                 "author": ', '.join((a['name'] for a in audiobook.book['authors'])),
 191                 "title": audiobook.book['title'],
 192                 "part": audiobook.part_name,
 193             },
 194             lambda name: Font.objects.get(name=name).truetype.path
 195         )
 196         buf = io.BytesIO()
 197         img.save(buf, format='PNG')
 198         return buf
 199
 200
 201 class Card(models.Model):
 202     youtube = models.ForeignKey(YouTube, models.CASCADE)
 203     order = models.SmallIntegerField()
 204     image = models.FileField(upload_to='youtube/card')
 205     duration = models.FloatField()
 206
 207     class Meta:
 208         ordering = ('order', )
 209
 210
 211 class Font(models.Model):
 212     name = models.CharField(max_length=255, unique=True)
 213     truetype = models.FileField(upload_to='youtube/font')
 214
 215     def __str__(self):
 216         return self.name