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import numpy as np
import re
import struct
import lameenc
def split_text_into_sentences(text: str, min_chunk_size: int = 150,split_pattern = r'\n+'):
if not text:
return []
# Clean text
text = re.sub(r'\s+', ' ', text).strip()
# Split atomic sentences
raw_parts = re.split(r'([.?!:;]+)(?=\s|$)', text)
atomic_sentences = []
current_atomic = ""
for part in raw_parts:
if not part.strip():
continue
if re.match(r'^[.?!:;]+$', part):
current_atomic += part
if current_atomic.strip():
atomic_sentences.append(current_atomic.strip())
current_atomic = ""
else:
current_atomic += part
if current_atomic.strip():
atomic_sentences.append(current_atomic.strip())
# Batching Logic
final_chunks = []
current_buffer = ""
first_sentence_sent = False
for sentence in atomic_sentences:
if not first_sentence_sent:
final_chunks.append(sentence)
first_sentence_sent = True
continue
if current_buffer:
current_buffer += " " + sentence
else:
current_buffer = sentence
if len(current_buffer) >= min_chunk_size:
final_chunks.append(current_buffer)
current_buffer = ""
if current_buffer:
final_chunks.append(current_buffer)
return final_chunks
def create_wav_header(sample_rate: int, channels: int = 1, bits_per_sample: int = 16):
byte_rate = sample_rate * channels * bits_per_sample // 8
block_align = channels * bits_per_sample // 8
header = b'RIFF'
header += struct.pack('<I', 0xFFFFFFFF)
header += b'WAVE'
header += b'fmt '
header += struct.pack('<I', 16)
header += struct.pack('<H', 1)
header += struct.pack('<H', channels)
header += struct.pack('<I', sample_rate)
header += struct.pack('<I', byte_rate)
header += struct.pack('<H', block_align)
header += struct.pack('<H', bits_per_sample)
header += b'data'
header += struct.pack('<I', 0xFFFFFFFF)
return header
def float_to_pcm16(audio_array):
"""Converts float32 audio to int16 bytes."""
audio_array = np.array(audio_array)
if len(audio_array.shape) > 1:
audio_array = audio_array.flatten()
# Clip to prevent distortion
audio_array = np.clip(audio_array, -1.0, 1.0)
# Convert to 16-bit PCM
audio_int16 = (audio_array * 32767).astype(np.int16)
return audio_int16.tobytes()
def create_mp3_encoder(sample_rate=44100, channels=1, bit_rate=128, quality=5):
encoder = lameenc.Encoder()
encoder.set_bit_rate(bit_rate)
encoder.set_in_sample_rate(sample_rate)
encoder.set_channels(channels)
encoder.set_quality(quality)
return encoder
def float_to_mp3(audio_array, encoder):
"""
Converts float32 audio -> Int16 -> Encoded MP3 bytes.
"""
# 1. Convert Float to PCM Int16
audio_array = np.array(audio_array)
if len(audio_array.shape) > 1:
audio_array = audio_array.flatten()
audio_array = np.clip(audio_array, -1.0, 1.0)
audio_int16 = (audio_array * 32767).astype(np.int16)
# 2. Encode to MP3
# lameenc returns a bytearray, but FastAPI/Starlette requires strictly 'bytes'
mp3_data = encoder.encode(audio_int16.tobytes())
return bytes(mp3_data) # <--- CRITICAL FIX: Convert bytearray to bytes |