Videre

linedance-app/venv/lib/python3.12/site-packages/audioread/maddec.py

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+# This file is part of audioread.
+# Copyright 2011, Adrian Sampson.
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+
+"""Decode MPEG audio files with MAD (via pymad)."""
+import mad
+
+from . import DecodeError
+from .base import AudioFile
+
+
+class UnsupportedError(DecodeError):
+    """The file is not readable by MAD."""
+
+
+class MadAudioFile(AudioFile):
+    """MPEG audio file decoder using the MAD library."""
+    def __init__(self, filename):
+        self.fp = open(filename, 'rb')
+        self.mf = mad.MadFile(self.fp)
+        if not self.mf.total_time():  # Indicates a failed open.
+            self.fp.close()
+            raise UnsupportedError()
+
+    def close(self):
+        if hasattr(self, 'fp'):
+            self.fp.close()
+        if hasattr(self, 'mf'):
+            del self.mf
+
+    def read_blocks(self, block_size=4096):
+        """Generates buffers containing PCM data for the audio file.
+        """
+        while True:
+            out = self.mf.read(block_size)
+            if not out:
+                break
+            yield bytes(out)
+
+    @property
+    def samplerate(self):
+        """Sample rate in Hz."""
+        return self.mf.samplerate()
+
+    @property
+    def duration(self):
+        """Length of the audio in seconds (a float)."""
+        return float(self.mf.total_time()) / 1000
+
+    @property
+    def channels(self):
+        """The number of channels."""
+        if self.mf.mode() == mad.MODE_SINGLE_CHANNEL:
+            return 1
+        elif self.mf.mode() in (mad.MODE_DUAL_CHANNEL,
+                                mad.MODE_JOINT_STEREO,
+                                mad.MODE_STEREO):
+            return 2
+        else:
+            # Other mode?
+            return 2
+
+    def __del__(self):
+        self.close()
+
+    # Iteration.
+    def __iter__(self):
+        return self.read_blocks()
+
+    # Context manager.
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.close()
+        return False