feat: 开放小爱音箱接入小智 AI 演示源代码
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Del Wang
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import logging
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import queue
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import numpy as np
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import pyaudio
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import opuslib
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from xiaozhi.services.protocols.typing import AudioConfig
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import time
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import sys
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from xiaozhi.services.audio.stream import MyAudio
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from xiaozhi.xiaoai import XiaoAi
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logger = logging.getLogger("AudioCodec")
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class AudioCodec:
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"""音频编解码器类，处理音频的录制和播放"""
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def __init__(self):
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"""初始化音频编解码器"""
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self.audio = None
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self.input_stream = None
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self.output_stream = None
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self.opus_encoder = None
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self.opus_decoder = None
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self.audio_decode_queue = queue.Queue()
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self._is_closing = False
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self._initialize_audio()
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def _initialize_audio(self):
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"""初始化音频设备和编解码器"""
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try:
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self.audio = MyAudio() if XiaoAi.mode == "xiaoai" else pyaudio.PyAudio()
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# 初始化音频输入流
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self.input_stream = self.audio.open(
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format=pyaudio.paInt16,
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channels=AudioConfig.CHANNELS,
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rate=AudioConfig.SAMPLE_RATE,
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input=True,
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frames_per_buffer=AudioConfig.FRAME_SIZE,
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)
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# 初始化音频输出流
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self.output_stream = self.audio.open(
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format=pyaudio.paInt16,
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channels=AudioConfig.CHANNELS,
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rate=AudioConfig.SAMPLE_RATE,
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output=True,
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frames_per_buffer=AudioConfig.FRAME_SIZE,
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)
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# 初始化Opus编码器
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self.opus_encoder = opuslib.Encoder(
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fs=AudioConfig.SAMPLE_RATE,
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channels=AudioConfig.CHANNELS,
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application=opuslib.APPLICATION_AUDIO,
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)
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# 初始化Opus解码器
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self.opus_decoder = opuslib.Decoder(
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fs=AudioConfig.SAMPLE_RATE, channels=AudioConfig.CHANNELS
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)
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logger.info("音频设备和编解码器初始化成功")
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except Exception as e:
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logger.error(f"初始化音频设备失败: {e}")
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raise
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def read_audio(self):
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"""读取音频输入数据并编码"""
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try:
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data = self.input_stream.read(
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AudioConfig.FRAME_SIZE, exception_on_overflow=False
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)
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if not data:
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return None
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return self.opus_encoder.encode(data, AudioConfig.FRAME_SIZE)
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except Exception as e:
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logger.error(f"读取音频输入时出错: {e}")
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return None
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def write_audio(self, opus_data):
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"""将编码的音频数据添加到播放队列"""
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self.audio_decode_queue.put(opus_data)
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def play_audio(self):
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"""处理并播放队列中的音频数据"""
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try:
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# 批量处理多个音频包以减少处理延迟
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batch_size = min(10, self.audio_decode_queue.qsize())
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if batch_size == 0:
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return False
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# 创建缓冲区存储解码后的数据
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buffer = bytearray()
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for _ in range(batch_size):
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if self.audio_decode_queue.empty():
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break
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opus_data = self.audio_decode_queue.get_nowait()
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try:
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pcm_data = self.opus_decoder.decode(
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opus_data, AudioConfig.FRAME_SIZE, decode_fec=False
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)
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buffer.extend(pcm_data)
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except Exception as e:
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logger.error(f"解码音频数据时出错: {e}")
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# 只有在有数据时才处理和播放
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if len(buffer) > 0:
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# 转换为numpy数组
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pcm_array = np.frombuffer(buffer, dtype=np.int16)
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# 播放音频
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try:
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if self.output_stream and self.output_stream.is_active():
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self.output_stream.write(pcm_array.tobytes())
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return True
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else:
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# MAC 特定：如果流不活跃，尝试重新初始化
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self._reinitialize_output_stream()
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if self.output_stream and self.output_stream.is_active():
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self.output_stream.write(pcm_array.tobytes())
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return True
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except OSError as e:
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if "Stream closed" in str(e) or "Internal PortAudio error" in str(
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e
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):
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logger.error(f"播放音频时出错: {e}")
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self._reinitialize_output_stream()
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else:
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logger.error(f"播放音频时出错: {e}")
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except queue.Empty:
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pass
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except Exception as e:
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logger.error(f"播放音频时出错: {e}")
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self._reinitialize_output_stream()
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return False
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def has_pending_audio(self):
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"""检查是否还有待播放的音频数据"""
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return not self.audio_decode_queue.empty()
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def wait_for_audio_complete(self, timeout=5.0):
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# 等待音频队列清空
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attempt = 0
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max_attempts = 15
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while not self.audio_decode_queue.empty() and attempt < max_attempts:
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time.sleep(0.1)
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attempt += 1
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# 在关闭前清空任何剩余数据
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while not self.audio_decode_queue.empty():
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try:
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self.audio_decode_queue.get_nowait()
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except queue.Empty:
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break
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def clear_audio_queue(self):
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"""清空音频队列"""
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while not self.audio_decode_queue.empty():
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try:
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self.audio_decode_queue.get_nowait()
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except queue.Empty:
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break
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def start_streams(self):
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"""启动音频流"""
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if not self.input_stream.is_active():
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self.input_stream.start_stream()
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if not self.output_stream.is_active():
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self.output_stream.start_stream()
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def stop_streams(self):
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"""停止音频流"""
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if self.input_stream and self.input_stream.is_active():
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self.input_stream.stop_stream()
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if self.output_stream and self.output_stream.is_active():
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self.output_stream.stop_stream()
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def _reinitialize_output_stream(self):
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"""重新初始化音频输出流"""
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if self._is_closing: # 如果正在关闭，不要重新初始化
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return
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try:
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if self.output_stream:
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try:
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if self.output_stream.is_active():
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self.output_stream.stop_stream()
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self.output_stream.close()
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except Exception as e:
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# logger.warning(f"关闭旧输出流时出错: {e}")
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pass
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# 在 MAC 上添加短暂延迟
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if sys.platform in ("darwin", "linux"):
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time.sleep(0.1)
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self.output_stream = self.audio.open(
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format=pyaudio.paInt16,
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channels=AudioConfig.CHANNELS,
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rate=AudioConfig.SAMPLE_RATE,
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output=True,
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frames_per_buffer=AudioConfig.FRAME_SIZE,
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)
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logger.info("音频输出流重新初始化成功")
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except Exception as e:
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logger.error(f"重新初始化音频输出流失败: {e}")
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raise
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def close(self):
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"""关闭音频编解码器，确保资源正确释放"""
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if self._is_closing: # 防止重复关闭
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return
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self._is_closing = True
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logger.info("开始关闭音频编解码器...")
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try:
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# 等待并清理剩余音频数据
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self.wait_for_audio_complete()
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# 关闭输入流
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if self.input_stream:
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logger.debug("正在关闭输入流...")
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try:
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if self.input_stream.is_active():
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self.input_stream.stop_stream()
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self.input_stream.close()
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except Exception as e:
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logger.error(f"关闭输入流时出错: {e}")
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self.input_stream = None
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# 关闭输出流
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if self.output_stream:
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logger.debug("正在关闭输出流...")
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try:
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if self.output_stream.is_active():
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self.output_stream.stop_stream()
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self.output_stream.close()
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except Exception as e:
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logger.error(f"关闭输出流时出错: {e}")
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self.output_stream = None
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# 关闭 PyAudio 实例
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if self.audio:
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logger.debug("正在终止 PyAudio...")
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try:
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self.audio.terminate()
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except Exception as e:
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logger.error(f"终止 PyAudio 时出错: {e}")
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self.audio = None
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# 清理编解码器
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self.opus_encoder = None
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self.opus_decoder = None
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logger.info("音频编解码器关闭完成")
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except Exception as e:
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logger.error(f"关闭音频编解码器时发生错误: {e}")
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finally:
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self._is_closing = False
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def __del__(self):
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"""析构函数，确保资源被释放"""
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self.close()
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