Add G722 decoder with pure python implementation

tests/decoder_test.py

@@ -0,0 +1,47 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# -----------------------------------------------------------------------------
+# Imports
+# -----------------------------------------------------------------------------
+import hashlib
+import os
+from bumble.decoder import G722Decoder
+
+
+# -----------------------------------------------------------------------------
+def test_decode_file():
+    decoder = G722Decoder()
+    output_bytes = bytearray()
+
+    with open(
+        os.path.join(os.path.dirname(__file__), 'g722_sample.g722'), 'rb'
+    ) as file:
+        file_content = file.read()
+        frame_length = 80
+        data_length = int(len(file_content) / frame_length)
+
+        for i in range(0, data_length):
+            decoded_data = decoder.decode_frame(
+                file_content[i * frame_length : i * frame_length + frame_length]
+            )
+            output_bytes.extend(decoded_data)
+
+        result = hashlib.md5(output_bytes).hexdigest()
+        assert result == 'b58e0cdd012d12f5633fc796c3b0fbd4'
+
+
+# -----------------------------------------------------------------------------
+if __name__ == '__main__':
+    test_decode_file()