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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
"""
final_fmt = ""
if format.startswith("custom:"):
final_fmt = format[7:]
else:
final_fmt = _get_final_fmt(format, quality)
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},
)
return ytdl_opts
def _get_audio_fmt(quality: str) -> str:
if quality == "best" or quality in ("128", "192", "320"):
audio_fmt = "bestaudio/best"
# Audio quality needs to be set post-download, set in opts
else:
raise Exception(f"Unknown quality {quality}")
return audio_fmt
def _get_video_res(quality: str) -> str:
if quality == "best":
video_fmt = ""
elif quality in ("1440", "1080", "720", "480"):
video_fmt = f"[height<={quality}]"
else:
raise Exception(f"Unknown quality {quality}")
return video_fmt
def _get_final_fmt(format: str, quality: str) -> str:
vfmt, afmt, vres = "", "", ""
if format == "mp4":
# video {res} {vfmt} + audio {afmt} {res} {vfmt}
vfmt, afmt = "[ext=mp4]", "[ext=m4a]"
vres = _get_video_res(quality)
combo = vres + vfmt
final_fmt = f"bestvideo{combo}+bestaudio{afmt}/best{combo}"
elif format == "mp3":
final_fmt = _get_audio_fmt(quality)
else:
raise Exception(f"Unkown format {format}")
return final_fmt
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