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_paths, output_path=None):
 103         audio = self.prepare_audio(input_paths)
 104         duration = self.get_duration(input_paths)
 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_paths):
 112         d = 0
 113         for input_path in input_paths:
 114             d += get_duration(input_path)
 115         if self.intro_flac:
 116             d += get_duration(self.intro_flac.path)
 117         if self.outro_flac:
 118             d += get_duration(self.outro_flac.path)
 119         return d
 120
 121     def prepare_audio(self, input_paths):
 122         files = []
 123         if self.intro_flac:
 124             files.append(standardize_audio(self.intro_flac.path))
 125         for input_path in input_paths:
 126             files.append(standardize_audio(input_path, cache=False))
 127         if self.outro_flac:
 128             files.append(standardize_audio(self.outro_flac.path))
 129         output = concat_audio(files)
 130         for d in files:
 131             unlink(d)
 132         return output
 133
 134     def prepare_video(self, duration):
 135         concat = []
 136         outro = []
 137         delete = []
 138
 139         if self.loop_video:
 140             fps = get_framerate(self.loop_video.path)
 141             loop_video = standardize_video(self.loop_video.path)
 142         else:
 143             fps = 25
 144
 145         loop_duration = duration
 146         for card in self.card_set.filter(duration__gt=0):
 147             loop_duration -= card.duration
 148             card_video = video_from_image(
 149                 card.image.path, card.duration, fps=fps
 150             )
 151             (concat if card.order < 0 else outro).append(card_video)
 152             delete.append(card_video)
 153
 154         if self.loop_video:
 155             loop_video_duration = get_duration(loop_video)
 156             times_loop = int(loop_duration // loop_video_duration)
 157
 158             leftover_duration = loop_duration % loop_video_duration
 159             leftover = cut_video(loop_video, leftover_duration)
 160             concat.extend([loop_video] * times_loop + [leftover])
 161             delete.append(leftover)
 162         else:
 163             leftover = video_from_image(self.loop_card.path, loop_duration)
 164             concat.append(video_from_image(self.loop_card.path, loop_duration, fps=fps))
 165             delete.append(leftover)
 166         concat.extend(outro)
 167
 168         output = concat_videos(concat)
 169         for p in delete:
 170             unlink(p)
 171         unlink(loop_video)
 172         return output
 173
 174     # tags
 175     # license
 176     # selfDeclaredMadeForKids
 177
 178     def update_thumbnail(self, audiobook):
 179         thumbnail = self.prepare_thumbnail(audiobook)
 180         response = youtube_call(
 181             "POST",
 182             "https://www.googleapis.com/upload/youtube/v3/thumbnails/set",
 183             params={'videoId': audiobook.youtube_id},
 184             data=thumbnail.getvalue(),
 185         )
 186
 187     def prepare_thumbnail(self, audiobook):
 188         img = create_thumbnail(
 189             self.thumbnail_template.path,
 190             self.thumbnail_definition,
 191             {
 192                 "author": ', '.join((a['name'] for a in audiobook.book['authors'])),
 193                 "title": audiobook.book['title'],
 194                 "part": audiobook.part_name,
 195             },
 196             lambda name: Font.objects.get(name=name).truetype.path
 197         )
 198         buf = io.BytesIO()
 199         img.save(buf, format='PNG')
 200         return buf
 201
 202
 203 class Card(models.Model):
 204     youtube = models.ForeignKey(YouTube, models.CASCADE)
 205     order = models.SmallIntegerField()
 206     image = models.FileField(upload_to='youtube/card')
 207     duration = models.FloatField()
 208
 209     class Meta:
 210         ordering = ('order', )
 211
 212
 213 class Font(models.Model):
 214     name = models.CharField(max_length=255, unique=True)
 215     truetype = models.FileField(upload_to='youtube/font')
 216
 217     def __str__(self):
 218         return self.name