Rename module from lyrics-dl to lrc-dl

lrc_dl/providers/youtube.py

@@ -0,0 +1,79 @@
+from typing import Optional, Dict
+from contextlib import redirect_stdout
+import subprocess
+import io
+import urllib
+import unittest.mock
+
+from yt_dlp import YoutubeDL
+
+from lrc_dl.core import Song, AbstractProvider
+from lrc_dl.registry import lyrics_provider
+from lrc_dl import utils
+
+
+@lyrics_provider
+class Youtube(AbstractProvider):
+    name = "youtube"
+
+    def _craft_search_link(self, song: Song) -> str:
+        query = f"{song.artist} - {song.title}"
+        query = urllib.parse.quote(query)
+        # sp=... means search only videos with subtitles
+        url = f"https://www.youtube.com/results?search_query={query}&sp=EgIoAQ%253D%253D"
+        return url
+
+    def _download_subtitles(self, video_id: str) -> str:
+        # buffer = io.BytesIO()
+        buffer = io.StringIO()
+
+        # A dirty monkey patch; youtube-dl does not
+        # support "-" filename for subtitles, so we
+        # just force it to use it here.
+        with unittest.mock.patch("yt_dlp.YoutubeDL.subtitles_filename", new=lambda *_: "-"):
+            with redirect_stdout(buffer):
+                with YoutubeDL({"writesubtitles": True, "skip_download": True, "subtitlesformat": "srt/vtt/best", 'logtostderr': True}) as ydl:
+                    ydl.download(video_id)
+
+        return buffer.getvalue()
+
+    def _subtitles_to_lyrics(self, subtitles: str) -> str:
+        # "-fflags +bitexact" prevents ffmpeg from
+        # writing metadata to .lrc file
+        # TODO: use `with` statement
+        process = subprocess.Popen(["ffmpeg", "-loglevel", "quiet", "-i", "-", "-f", "lrc", "-fflags", "+bitexact", "-"], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+
+        if not process.stdin or not process.stdout:
+            return ""
+
+        process.stdin.write(subtitles.encode())
+        process.stdin.close()
+        process.wait()
+        return process.stdout.read().decode()[1:]
+
+    def fetch_lyrics(self, song: Song) -> Optional[str]:
+        search_link = self._craft_search_link(song)
+        with YoutubeDL({"extract_flat": True, "playlistend": 10}) as ydl:
+            videos = ydl.extract_info(search_link)["entries"]
+
+        if song.duration:
+            def match_duration(video: Dict) -> bool:
+                return utils.threshold_equal(video["duration"], song.duration, 2)
+            videos = filter(match_duration, videos)
+
+        def match_title(video: Dict) -> bool:
+            return True
+        videos = filter(match_title, videos)
+
+        video = utils.next_or_none(videos)
+
+        if not video:
+            return None
+
+        subtitles = self._download_subtitles(video["id"])
+        lyrics = self._subtitles_to_lyrics(subtitles)
+
+        if lyrics != "":
+            return lyrics
+
+        return None