1 files changed, 62 insertions, 0 deletions
diff --git a/app/dl_formats.py b/app/dl_formats.py
new file mode 100644
index 0000000..1f27ee9
--- /dev/null
+++ b/app/dl_formats.py
@@ -0,0 +1,62 @@
+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
+    """
+    format = format or "best"
+
+    if format.startswith("custom:"):
+        return format[7:]
+
+    if format == "mp3":
+        # Audio quality needs to be set post-download, set in opts
+        return "bestaudio/best"
+
+    if format in ("mp4", "any"):
+        if quality == "audio":
+            return "bestaudio/best"
+
+        # video {res} {vfmt} + audio {afmt} {res} {vfmt}
+        vfmt, afmt = ("[ext=mp4]", "[ext=m4a]") if format == "mp4" else ("", "")
+        vres = f"[height<={quality}]" if quality != "best" else ""
+        vcombo = vres + vfmt
+
+        return f"bestvideo{vcombo}+bestaudio{afmt}/best{vcombo}"
+
+    raise Exception(f"Unkown format {format}")
+
+
+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