infer_server.py

import _thread
import argparse
import asyncio
import functools
import os
import sys
import time
import wave
from datetime import datetime
from typing import List

import websockets
import yaml
from flask import request, Flask, render_template
from flask_cors import CORS

from ppasr.predict import PPASRPredictor
from ppasr.utils.utils import add_arguments, print_arguments
from ppasr.utils.logger import setup_logger

logger = setup_logger(__name__)

parser = argparse.ArgumentParser(description=__doc__)
add_arg = functools.partial(add_arguments, argparser=parser)
add_arg('configs',          str,    'configs/conformer_online_zh.yml', "配置文件")
add_arg("host",             str,    '0.0.0.0',            "监听主机的IP地址")
add_arg("port_server",      int,    5000,                 "普通识别服务所使用的端口号")
add_arg("port_stream",      int,    5001,                 "流式识别服务所使用的端口号")
add_arg("save_path",        str,    'dataset/upload/',    "上传音频文件的保存目录")
add_arg('use_gpu',          bool,   True,   "是否使用GPU预测")
add_arg('use_pun',          bool,   False,  "是否给识别结果加标点符号")
add_arg('is_itn',           bool,   False,  "是否对文本进行反标准化")
add_arg('num_predictor',    int,    1,      "多少个预测器，也是就可以同时有多少个用户同时识别")
add_arg('model_path',       str,    'models/{}_{}/infer/',   "导出的预测模型文件路径")
add_arg('pun_model_dir',    str,    'models/pun_models/',    "加标点符号的模型文件夹路径")
args = parser.parse_args()

# 读取配置文件
with open(args.configs, 'r', encoding='utf-8') as f:
    configs = yaml.load(f.read(), Loader=yaml.FullLoader)
print_arguments(args, configs)


app = Flask(__name__, template_folder="templates", static_folder="static", static_url_path="/")
# 允许跨越访问
CORS(app)


# 创建多个预测器，实时语音识别所以要这样处理
predictors: List[PPASRPredictor] = []
for _ in range(args.num_predictor):
    predictor1 = PPASRPredictor(configs=configs,
                                model_path=args.model_path.format(configs['use_model'],
                                                                  configs['preprocess_conf']['feature_method']),
                                use_gpu=args.use_gpu,
                                use_pun=args.use_pun,
                                pun_model_dir=args.pun_model_dir)
    predictors.append(predictor1)


# 语音识别接口
@app.route("/recognition", methods=['POST'])
def recognition():
    f = request.files['audio']
    if f:
        # 临时保存路径
        file_path = os.path.join(args.save_path, f.filename)
        f.save(file_path)
        try:
            start = time.time()
            # 执行识别
            result = predictors[0].predict(audio_data=file_path, use_pun=args.use_pun, is_itn=args.is_itn)
            score, text = result['score'], result['text']
            end = time.time()
            print("识别时间：%dms，识别结果：%s， 得分: %f" % (round((end - start) * 1000), text, score))
            result = str({"code": 0, "msg": "success", "result": text, "score": round(score, 3)}).replace("'", '"')
            return result
        except Exception as e:
            print(f'[{datetime.now()}] 短语音识别失败，错误信息：{e}', file=sys.stderr)
            return str({"error": 1, "msg": "audio read fail!"})
    return str({"error": 3, "msg": "audio is None!"})


# 长语音识别接口
@app.route("/recognition_long_audio", methods=['POST'])
def recognition_long_audio():
    f = request.files['audio']
    if f:
        # 临时保存路径
        file_path = os.path.join(args.save_path, f.filename)
        f.save(file_path)
        try:
            start = time.time()
            result = predictors[0].predict_long(audio_data=file_path, use_pun=args.use_pun, is_itn=args.is_itn)
            score, text = result['score'], result['text']
            end = time.time()
            print("识别时间：%dms，识别结果：%s， 得分: %f" % (round((end - start) * 1000), text, score))
            result = str({"code": 0, "msg": "success", "result": text, "score": score}).replace("'", '"')
            return result
        except Exception as e:
            print(f'[{datetime.now()}] 长语音识别失败，错误信息：{e}', file=sys.stderr)
            return str({"error": 1, "msg": "audio read fail!"})
    return str({"error": 3, "msg": "audio is None!"})


@app.route('/')
def home():
    return render_template("index.html")


# 流式识别WebSocket服务
async def stream_server_run(websocket, path):
    logger.info(f'有WebSocket连接建立：{websocket.remote_address}')
    use_predictor = None
    for predictor in predictors:
        if predictor.running: continue
        use_predictor = predictor
        use_predictor.running = True
        break
    if use_predictor is not None:
        frames = []
        while not websocket.closed:
            try:
                data = await websocket.recv()
                frames.append(data)
                if len(data) == 0: continue
                is_end = False
                # 判断是不是结束预测
                if b'end' == data[-3:]:
                    is_end = True
                    data = data[:-3]
                # 开始预测
                result = use_predictor.predict_stream(audio_data=data, use_pun=args.use_pun, is_itn=args.is_itn,
                                                      is_end=is_end)
                if result is None: continue
                score, text = result['score'], result['text']
                send_data = str({"code": 0, "result": text}).replace("'", '"')
                logger.info(f'向客户端发生消息：{send_data}')
                await websocket.send(send_data)
                # 结束了要关闭当前的连接
                if is_end: await websocket.close()
            except Exception as e:
                logger.error(f'识别发生错误：错误信息：{e}')
                try:
                    await websocket.send(str({"code": 2, "msg": "recognition fail!"}))
                except:pass
        # 重置流式识别
        use_predictor.reset_stream()
        use_predictor.running = False
        # 保存录音
        save_path = os.path.join(args.save_path, f"{int(time.time() * 1000)}.wav")
        audio_bytes = b''.join(frames)
        wf = wave.open(save_path, 'wb')
        wf.setnchannels(1)
        wf.setsampwidth(2)
        wf.setframerate(16000)
        wf.writeframes(audio_bytes)
        wf.close()
    else:
        logger.error(f'语音识别失败，预测器不足')
        await websocket.send(str({"code": 1, "msg": "recognition fail, no resource!"}))
        websocket.close()


# 因为有多个服务需要使用线程启动
def start_server_thread():
    app.run(host=args.host, port=args.port_server)


if __name__ == '__main__':
    if not os.path.exists(args.save_path):
        os.makedirs(args.save_path)
    _thread.start_new_thread(start_server_thread, ())
    # 启动Flask服务
    server = websockets.serve(stream_server_run, args.host, args.port_stream)
    # 启动WebSocket服务
    asyncio.get_event_loop().run_until_complete(server)
    asyncio.get_event_loop().run_forever()