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spotdl/encode/encode_base.py

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+import os
+
+from abc import ABC
+from abc import abstractmethod
+
+"""
+  NOTE ON ENCODERS
+  ================
+
+* A comparision between FFmpeg, avconv, and libav:
+  https://stackoverflow.com/questions/9477115
+
+* FFmeg encoders sorted in descending order based
+  on the quality of audio produced:
+  libopus > libvorbis >= libfdk_aac > aac > libmp3lame
+
+* libfdk_aac encoder, due to copyrights needs to be compiled
+  by end user on MacOS brew install ffmpeg --with-fdk-aac
+  will do just that. Other OS? See:
+  https://trac.ffmpeg.org/wiki/Encode/AAC
+
+"""
+
+
+class EncoderBase(ABC):
+    @abstractmethod
+    def __init__(self, encoder_path, loglevel, additional_arguments):
+        self.encoder_path = encoder_path
+        self._loglevel = loglevel
+        self._additional_arguments = additional_arguments
+
+    @abstractmethod
+    def set_argument(self, argument):
+        self._additional_arguments += argument.split()
+
+    @abstractmethod
+    def get_encoding(self, filename):
+        _, extension = os.path.splitext(filename)
+        # Ignore the initial dot from file extension
+        return extension[1:]
+
+    @abstractmethod
+    def set_debuglog(self):
+        pass
+
+    @abstractmethod
+    def _generate_encode_command(self, input_file, output_file):
+        pass
+
+    @abstractmethod
+    def _generate_encoding_arguments(self, input_encoding, output_encoding):
+        pass
+
+    @abstractmethod
+    def re_encode(self, input_encoding, output_encoding):
+        pass