[FEATURE] Audio extract plugin (#177)

docs/config.rst

@@ -169,6 +169,14 @@ Plugins
 """""""
 Plugins are used to perform any type of post-processing to the already downloaded files.
 
+audio_extract
+'''''''''''''
+.. autoclass:: ytdl_sub.plugins.audio_extract.AudioExtractOptions()
+  :members:
+  :member-order: bysource
+
+-------------------------------------------------------------------------------
+
 music_tags
 ''''''''''
 .. autoclass:: ytdl_sub.plugins.music_tags.MusicTagsOptions()

examples/youtube_extract_and_tag_audio.yaml

@@ -0,0 +1,38 @@
+# Extracts audio from YouTube videos, converts it to mp3, and adds audio tags to it.
+configuration:
+  working_directory: '.ytdl-sub-downloads'
+
+presets:
+  yt_song:
+    youtube:
+      download_strategy: "video"
+
+    output_options:
+      output_directory: "{music_directory}"
+      file_name: "{title_sanitized}.{ext}"
+
+    audio_extract:
+      codec: "mp3"
+      quality: 128
+
+    music_tags:
+      tags:
+        artist: "{artist}"
+        albumartist: "{artist}"
+        title: "{title}"
+        album: "Singles"
+        track: "1"
+        year: "{upload_year}"
+        genre: "Unset"
+
+    overrides:
+      music_directory: "/path/to/music"
+
+  yt_song_playlist:
+    preset: yt_song
+    youtube:
+      download_strategy: "playlist"
+
+    music_tags:
+      tags:
+        track: "{playlist_index}"

src/ytdl_sub/config/preset_class_mappings.py

@@ -9,6 +9,7 @@ from ytdl_sub.downloaders.youtube.merge_playlist import YoutubeMergePlaylistDown
 from ytdl_sub.downloaders.youtube.playlist import YoutubePlaylistDownloader
 from ytdl_sub.downloaders.youtube.split_video import YoutubeSplitVideoDownloader
 from ytdl_sub.downloaders.youtube.video import YoutubeVideoDownloader
+from ytdl_sub.plugins.audio_extract import AudioExtractPlugin
 from ytdl_sub.plugins.music_tags import MusicTagsPlugin
 from ytdl_sub.plugins.nfo_tags import NfoTagsPlugin
 from ytdl_sub.plugins.output_directory_nfo_tags import OutputDirectoryNfoTagsPlugin
@@ -107,6 +108,7 @@ class PluginMapping:
     """
 
     _MAPPING: Dict[str, Type[Plugin]] = {
+        "audio_extract": AudioExtractPlugin,
         "music_tags": MusicTagsPlugin,
         "video_tags": VideoTagsPlugin,
         "nfo_tags": NfoTagsPlugin,

src/ytdl_sub/downloaders/downloader.py

@@ -132,7 +132,7 @@ class Downloader(DownloadArchiver, Generic[DownloaderOptionsT, DownloaderEntryT]
 
     def extract_info_with_retry(
         self,
-        is_downloaded_fn: Optional[Callable[[], bool]],
+        is_downloaded_fn: Optional[Callable[[], bool]] = None,
         ytdl_options_overrides: Optional[Dict] = None,
         **kwargs,
     ) -> Dict:

src/ytdl_sub/entries/entry.py

@@ -6,6 +6,7 @@ from typing import final
 
 from ytdl_sub.entries.base_entry import BaseEntry
 from ytdl_sub.entries.variables.entry_variables import EntryVariables
+from ytdl_sub.validators.audo_codec_validator import AUDIO_CODEC_EXTS
 
 
 class Entry(EntryVariables, BaseEntry):
@@ -65,13 +66,17 @@ class Entry(EntryVariables, BaseEntry):
         -------
         True if the file and thumbnail exist locally. False otherwise.
         """
-        thumbnail_exists = (
-            os.path.isfile(self.get_download_thumbnail_path())
-            or self.get_ytdlp_download_thumbnail_path() is not None
-        )
         file_exists = os.path.isfile(self.get_download_file_path())
 
-        return file_exists and thumbnail_exists
+        # HACK: yt-dlp does not record extracted audio extensions anywhere. If the file is not
+        # found, try it using audio extensions
+        if not file_exists:
+            for audio_ext in AUDIO_CODEC_EXTS:
+                if os.path.isfile(self.get_download_file_path().removesuffix(self.ext) + audio_ext):
+                    file_exists = True
+                    break
+
+        return file_exists
 
     @final
     def to_dict(self) -> Dict[str, str]:

src/ytdl_sub/plugins/audio_extract.py

@@ -0,0 +1,108 @@
+import os.path
+from typing import Dict
+from typing import Optional
+
+from ytdl_sub.downloaders.ytdl_options_builder import YTDLOptionsBuilder
+from ytdl_sub.entries.entry import Entry
+from ytdl_sub.plugins.plugin import Plugin
+from ytdl_sub.plugins.plugin import PluginOptions
+from ytdl_sub.utils.exceptions import FileNotDownloadedException
+from ytdl_sub.validators.audo_codec_validator import AUDIO_CODEC_TYPES_EXTENSION_MAPPING
+from ytdl_sub.validators.audo_codec_validator import CodecTypeValidator
+from ytdl_sub.validators.validators import FloatValidator
+
+
+class AudioExtractOptions(PluginOptions):
+    """
+    Extracts audio from a video file.
+
+    Usage:
+
+    .. code-block:: yaml
+
+       presets:
+         my_example_preset:
+           audio_extract:
+             codec: "mp3"
+             quality: 128
+    """
+
+    _optional_keys = {"codec", "quality"}
+
+    def __init__(self, name, value):
+        super().__init__(name, value)
+        self._codec = self._validate_key(key="codec", validator=CodecTypeValidator).value
+        self._quality = self._validate_key_if_present(key="quality", validator=FloatValidator)
+
+    @property
+    def codec(self) -> str:
+        """
+        The codec to output after extracting the audio. Supported codecs are aac, flac, mp3, m4a,
+        opus, vorbis, wav.
+        """
+        return self._codec
+
+    @property
+    def quality(self) -> Optional[float]:
+        """
+        Optional. Specify ffmpeg audio quality. Insert a value between ``0`` (better) and ``9``
+        (worse) for variable bitrate, or a specific bitrate like ``128`` for 128k.
+        """
+        if self._quality is not None:
+            return self._quality.value
+        return None
+
+
+class AudioExtractPlugin(Plugin[AudioExtractOptions]):
+    plugin_options_type = AudioExtractOptions
+
+    def ytdl_options(self) -> Optional[Dict]:
+        """
+        Returns
+        -------
+        YTDL options for extracting audio
+        """
+        ytdl_options_builder = YTDLOptionsBuilder()
+
+        postprocessor_dict = {
+            "key": "FFmpegExtractAudio",
+            "when": "post_process",
+            "preferredcodec": self.plugin_options.codec,
+        }
+        if self.plugin_options.quality is not None:
+            postprocessor_dict["preferredquality"] = self.plugin_options.quality
+
+        return ytdl_options_builder.add(
+            {
+                "postprocessors": [postprocessor_dict],
+            }
+        ).to_dict()
+
+    def modify_entry(self, entry: Entry) -> Optional[Entry]:
+        """
+        Parameters
+        ----------
+        entry
+            Entry with extracted audio
+
+        Returns
+        -------
+        Entry with updated 'ext' source variable
+
+        Raises
+        ------
+        FileNotDownloadedException
+            If the audio file is not found
+        """
+        new_ext = AUDIO_CODEC_TYPES_EXTENSION_MAPPING[self.plugin_options.codec]
+        extracted_audio_file = entry.get_download_file_path().removesuffix(entry.ext) + new_ext
+        if not self.is_dry_run:
+            if not os.path.isfile(extracted_audio_file):
+                raise FileNotDownloadedException("Failed to find the extracted audio file")
+
+        # TODO: create entry function to update kwargs
+        # pylint: disable=protected-access
+        entry._kwargs["ext"] = new_ext
+        # pylint: enable=protected-access
+
+        return entry

src/ytdl_sub/subscriptions/subscription_ytdl_options.py

@@ -8,6 +8,7 @@ from typing import TypeVar
 from ytdl_sub.config.preset import Preset
 from ytdl_sub.downloaders.downloader import Downloader
 from ytdl_sub.downloaders.ytdl_options_builder import YTDLOptionsBuilder
+from ytdl_sub.plugins.audio_extract import AudioExtractPlugin
 from ytdl_sub.plugins.plugin import Plugin
 from ytdl_sub.plugins.subtitles import SubtitleOptions
 from ytdl_sub.plugins.subtitles import SubtitlesPlugin
@@ -81,6 +82,13 @@ class SubscriptionYTDLOptions:
 
         return ytdl_options
 
+    @property
+    def _audio_extract_options(self) -> Dict:
+        if not (audio_extract_plugin := self._get_plugin(AudioExtractPlugin)):
+            return {}
+
+        return audio_extract_plugin.ytdl_options()
+
     @property
     def _subtitle_options(self) -> Dict:
         if not (subtitle_plugin := self._get_plugin(SubtitlesPlugin)):
@@ -90,6 +98,7 @@ class SubscriptionYTDLOptions:
             # TODO: warn here
             return {}
 
+        # TODO: Use subtitle ytdl_options
         builder = YTDLOptionsBuilder().add({"writesubtitles": True})
         subtitle_options: SubtitleOptions = subtitle_plugin.plugin_options
 
@@ -141,7 +150,10 @@ class SubscriptionYTDLOptions:
             )
         else:
             ytdl_options_builder.add(
-                self._output_options, self._subtitle_options, self._user_ytdl_options
+                self._output_options,
+                self._subtitle_options,
+                self._audio_extract_options,
+                self._user_ytdl_options,
             )
 
         return ytdl_options_builder

src/ytdl_sub/validators/audo_codec_validator.py

@@ -0,0 +1,22 @@
+from typing import Dict
+from typing import Set
+
+from ytdl_sub.validators.string_select_validator import StringSelectValidator
+
+AUDIO_CODEC_TYPES_EXTENSION_MAPPING: Dict[str, str] = {
+    "aac": "aac",
+    "flac": "flac",
+    "mp3": "mp3",
+    "m4a": "m4a",
+    "opus": "opus",
+    "vorbis": "ogg",
+    "wav": "wav",
+}
+
+AUDIO_CODEC_TYPES: Set[str] = set(AUDIO_CODEC_TYPES_EXTENSION_MAPPING.keys())
+AUDIO_CODEC_EXTS: Set[str] = set(AUDIO_CODEC_TYPES_EXTENSION_MAPPING.values())
+
+
+class CodecTypeValidator(StringSelectValidator):
+    _expected_value_type_name = "codec"
+    _select_values = AUDIO_CODEC_TYPES

src/ytdl_sub/validators/validators.py

@@ -11,6 +11,7 @@ from typing import final
 
 from ytdl_sub.utils.exceptions import ValidationException
 
+ValueT = TypeVar("ValueT", bound=object)
 ValidationExceptionT = TypeVar("ValidationExceptionT", bound=ValidationException)
 ValidatorT = TypeVar("ValidatorT", bound="Validator")
 
@@ -59,40 +60,34 @@ class Validator(ABC):
         return exception_class(f"{prefix}{error_message}")
 
 
-class BoolValidator(Validator):
+class ValueValidator(Validator, ABC, Generic[ValueT]):
     """
-    Validates boolean fields.
+    Native type validator that returns the value as-is
     """
 
+    @property
+    def value(self) -> ValueT:
+        """
+        Returns
+        -------
+        The value, unmodified
+        """
+        return self._value
+
+
+class BoolValidator(ValueValidator[bool]):
     _expected_value_type: Type = bool
     _expected_value_type_name = "boolean"
 
-    @property
-    def value(self) -> bool:
-        """
-        Returns
-        -------
-        Boolean value
-        """
-        return self._value
-
-
-class StringValidator(Validator):
-    """
-    Validates string fields.
-    """
 
+class StringValidator(ValueValidator[str]):
     _expected_value_type = str
     _expected_value_type_name = "string"
 
-    @property
+
-    def value(self) -> str:
+class FloatValidator(ValueValidator[float]):
-        """
+    _expected_value_type = (int, float)
-        Returns
+    _expected_value_type_name = "float"
-        -------
-        String value
-        """
-        return self._value
 
 
 class ListValidator(Validator, ABC, Generic[ValidatorT]):

tests/e2e/conftest.py

@@ -38,6 +38,16 @@ def soundcloud_discography_config():
     return ConfigFile.from_file_path(config_path="examples/soundcloud_discography_config.yaml")
 
 
+@pytest.fixture()
+def youtube_audio_config_path():
+    return "examples/youtube_extract_and_tag_audio.yaml"
+
+
+@pytest.fixture()
+def youtube_audio_config(youtube_audio_config_path):
+    return ConfigFile.from_file_path(config_path=youtube_audio_config_path)
+
+
 @pytest.fixture
 def timestamps_file_path():
     timestamps = [

tests/e2e/plugins/test_audio_extract.py

@@ -0,0 +1,91 @@
+import mergedeep
+import pytest
+from e2e.expected_download import assert_expected_downloads
+from e2e.expected_transaction_log import assert_transaction_log_matches
+
+from ytdl_sub.subscriptions.subscription import Subscription
+
+
+@pytest.fixture
+def single_song_preset_dict(output_directory):
+    return {
+        "preset": "yt_song",
+        "youtube": {"video_url": "https://www.youtube.com/watch?v=2lAe1cqCOXo"},
+        "output_options": {"output_directory": output_directory},
+        # download the worst format so it is fast
+        "ytdl_options": {
+            "format": "worst[ext=mp4]",
+        },
+    }
+
+
+@pytest.fixture
+def multiple_songs_preset_dict(output_directory):
+    return {
+        "preset": "yt_song_playlist",
+        "youtube": {"playlist_url": "https://youtube.com/playlist?list=PL5BC0FC26BECA5A35"},
+        "output_options": {"output_directory": output_directory},
+        "audio_extract": {"codec": "vorbis", "quality": 140},
+        # download the worst format so it is fast
+        "ytdl_options": {
+            "format": "worst[ext=mp4]",
+        },
+    }
+
+
+class TestAudioExtract:
+    @pytest.mark.parametrize("dry_run", [True, False])
+    def test_audio_extract_single_song(
+        self,
+        youtube_audio_config,
+        single_song_preset_dict,
+        output_directory,
+        dry_run,
+    ):
+        subscription = Subscription.from_dict(
+            config=youtube_audio_config,
+            preset_name="single_song_test",
+            preset_dict=single_song_preset_dict,
+        )
+
+        transaction_log = subscription.download(dry_run=dry_run)
+        assert_transaction_log_matches(
+            output_directory=output_directory,
+            transaction_log=transaction_log,
+            transaction_log_summary_file_name="plugins/test_audio_extract_single.txt",
+            regenerate_transaction_log=True,
+        )
+        assert_expected_downloads(
+            output_directory=output_directory,
+            dry_run=dry_run,
+            expected_download_summary_file_name="plugins/test_audio_extract_single.json",
+            regenerate_expected_download_summary=True,
+        )
+
+    @pytest.mark.parametrize("dry_run", [True, False])
+    def test_audio_extract_multiple_songs(
+        self,
+        youtube_audio_config,
+        multiple_songs_preset_dict,
+        output_directory,
+        dry_run,
+    ):
+        subscription = Subscription.from_dict(
+            config=youtube_audio_config,
+            preset_name="multiple_songs_test",
+            preset_dict=multiple_songs_preset_dict,
+        )
+
+        transaction_log = subscription.download(dry_run=dry_run)
+        assert_transaction_log_matches(
+            output_directory=output_directory,
+            transaction_log=transaction_log,
+            transaction_log_summary_file_name="plugins/test_audio_extract_playlist.txt",
+            regenerate_transaction_log=True,
+        )
+        assert_expected_downloads(
+            output_directory=output_directory,
+            dry_run=dry_run,
+            expected_download_summary_file_name="plugins/test_audio_extract_playlist.json",
+            regenerate_expected_download_summary=True,
+        )

tests/e2e/resources/expected_downloads_summaries/plugins/test_audio_extract_playlist.json

@@ -0,0 +1,5 @@
+{
+  "Jesse's Minecraft Server [Trailer - Feb.1].ogg": "67b19b495756fb6dc332f49bfa2957d3",
+  "Jesse's Minecraft Server [Trailer - Feb.27].ogg": "273c96652e198171ee60345051addc7a",
+  "Jesse's Minecraft Server [Trailer - Mar.21].ogg": "e91db58c153f0724aaed5ce53de2a736"
+}

tests/e2e/resources/expected_downloads_summaries/plugins/test_audio_extract_single.json

@@ -0,0 +1,3 @@
+{
+  "YouTube Rewind 2019： For the Record ｜ #YouTubeRewind.mp3": "c4ce74e2ddc4e6a0ab823b5b622e2275"
+}

tests/e2e/resources/transaction_log_summaries/plugins/test_audio_extract_playlist.txt

@@ -0,0 +1,29 @@
+Files created in '{output_directory}'
+----------------------------------------
+Jesse's Minecraft Server [Trailer - Feb.1].ogg
+  Music Tags:
+    album: Singles
+    albumartist: Project Zombie
+    artist: Project Zombie
+    genre: Unset
+    title: Jesse's Minecraft Server [Trailer - Feb.1]
+    track: 3
+    year: 2011
+Jesse's Minecraft Server [Trailer - Feb.27].ogg
+  Music Tags:
+    album: Singles
+    albumartist: Project Zombie
+    artist: Project Zombie
+    genre: Unset
+    title: Jesse's Minecraft Server [Trailer - Feb.27]
+    track: 2
+    year: 2011
+Jesse's Minecraft Server [Trailer - Mar.21].ogg
+  Music Tags:
+    album: Singles
+    albumartist: Project Zombie
+    artist: Project Zombie
+    genre: Unset
+    title: Jesse's Minecraft Server [Trailer - Mar.21]
+    track: 1
+    year: 2011

tests/e2e/resources/transaction_log_summaries/plugins/test_audio_extract_single.txt

@@ -0,0 +1,11 @@
+Files created in '{output_directory}'
+----------------------------------------
+YouTube Rewind 2019： For the Record ｜ #YouTubeRewind.mp3
+  Music Tags:
+    album: Singles
+    albumartist: YouTube
+    artist: YouTube
+    genre: Unset
+    title: YouTube Rewind 2019: For the Record | #YouTubeRewind
+    track: 1
+    year: 2019