do not save announcements to files anymore

multilang_translator/text_to_speech/encode_lc3.py

@@ -0,0 +1,32 @@
+import numpy as np
+import lc3
+
+def encode(
+        audio: np.array,
+        output_sample_rate_hz,
+        octets_per_frame,
+        frame_duration_us=10000,
+        pcm_bit_depth = 16
+        ):
+
+    encoder = lc3.Encoder(
+        frame_duration_us=frame_duration_us,
+        sample_rate_hz=output_sample_rate_hz,
+        num_channels=1,
+        #input_sample_rate_hz=input_sample_rate,
+    )
+
+    lc3_frame_samples = encoder.get_frame_samples() # number of the pcm samples per lc3 frame
+
+    # reshape array into slices of lc3_frame_samples and padd with zeros
+    pad_width = (lc3_frame_samples - len(audio) % lc3_frame_samples) % lc3_frame_samples  # Compute padding length
+    arr_padded = np.pad(audio, (0, pad_width), mode='constant', constant_values=0)
+    reshaped_arr = arr_padded.reshape(-1, lc3_frame_samples)
+
+    lc3_bytes = b''
+    for pcm_frame in reshaped_arr:
+        lc3_bytes += encoder.encode(
+                pcm_frame, num_bytes=octets_per_frame, bit_depth=pcm_bit_depth
+            )
+
+    return lc3_bytes