Added quality choice based on format

1 files changed, 85 insertions, 0 deletions

diff --git a/app/dl_formats.py b/app/dl_formats.py
new file mode 100644
index 0000000..184f9f9
--- /dev/null
+++ b/app/dl_formats.py
@@ -0,0 +1,85 @@
+def get_format(format: str, quality: str) -> str:
+    """
+    Returns format for download
+
+    Args:
+      format (str): format selected
+      quality (str): quality selected
+
+    Raises:
+      Exception: unknown quality, unknown format
+
+    Returns:
+      dl_format: Formatted download string
+    """
+    audio_fmt = ""
+    video_fmt = ""
+    final_fmt = ""
+
+    if format.startswith("custom: "):
+        final_fmt = format[7:]
+    elif format == "any":
+        final_fmt = "bv*+ba/b"
+    elif format == "mp3":
+        audio_fmt = _get_audio_fmt(quality)
+    elif format == "mp4":
+        audio_fmt = "ba/b"
+        video_fmt = _get_video_fmt(quality)
+    else:
+        raise Exception(f"Unknown format {format}")
+
+    if not final_fmt:
+        final_fmt = video_fmt + audio_fmt
+
+    return final_fmt
+
+
+def get_opts(format: str, quality: str, ytdl_opts: dict) -> dict:
+    """
+    Returns extra download options
+    Mostly postprocessing options
+
+    Args:
+      format (str): format selected
+      quality (str): quality of format selected (needed for some formats)
+      ytdl_opts (dict): current options selected
+
+    Returns:
+      ytdl_opts: Extra options
+    """
+    if "postprocessors" not in ytdl_opts:
+        ytdl_opts["postprocessors"] = []
+
+    if format == "mp3":
+        extra_args = {}
+        if quality != "best":
+            extra_args = {"preferredquality": quality}
+        ytdl_opts["postprocessors"].append(
+            {"key": "FFmpegExtractAudio", "preferredcodec": "mp3", **extra_args},
+        )
+
+    elif format == "mp4":
+        ytdl_opts["merge_output_format"] = "mp4"
+
+    return ytdl_opts
+
+
+def _get_audio_fmt(quality: str) -> str:
+    if quality == "best" or quality in ("128", "192", "320"):
+        audio_fmt = "ba/b"
+        # Audio quality needs to be set post-download, set in opts
+    else:
+        raise Exception(f"Unknown quality {quality}")
+
+    return audio_fmt
+
+
+def _get_video_fmt(quality: str) -> str:
+    if quality == "best":
+        video_fmt = "bv*+"
+    elif quality in ("1440", "1080", "720", "480"):
+        video_fmt = f"bv[height<={quality}]+"
+    else:
+        raise Exception(f"Unknown quality {quality}")
+
+    return video_fmt