asr_cn_wer_xunfei.py

# -*- coding:utf-8 -*-
#
#   author: iflytek
#
#  本demo测试时运行的环境为：Windows + Python3.7
#  本demo测试成功运行时所安装的第三方库及其版本如下，您可自行逐一或者复制到一个新的txt文件利用pip一次性安装：
#   cffi==1.12.3
#   gevent==1.4.0
#   greenlet==0.4.15
#   pycparser==2.19
#   six==1.12.0
#   websocket==0.2.1
#   websocket-client==0.56.0
#
#  语音听写流式 WebAPI 接口调用示例 接口文档（必看）：https://doc.xfyun.cn/rest_api/语音听写（流式版）.html
#  webapi 听写服务参考帖子（必看）：http://bbs.xfyun.cn/forum.php?mod=viewthread&tid=38947&extra=
#  语音听写流式WebAPI 服务，热词使用方式：登陆开放平台https://www.xfyun.cn/后，找到控制台--我的应用---语音听写（流式）---服务管理--个性化热词，
#  设置热词
#  注意：热词只能在识别的时候会增加热词的识别权重，需要注意的是增加相应词条的识别率，但并不是绝对的，具体效果以您测试为准。
#  语音听写流式WebAPI 服务，方言试用方法：登陆开放平台https://www.xfyun.cn/后，找到控制台--我的应用---语音听写（流式）---服务管理--识别语种列表
#  可添加语种或方言，添加后会显示该方言的参数值
#  错误码链接：https://www.xfyun.cn/document/error-code （code返回错误码时必看）
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
import os
import re
import websocket
import hashlib
import base64
import hmac
import json
import glob
from urllib.parse import urlencode
import time
import ssl
from wsgiref.handlers import format_date_time
from datetime import datetime
from time import mktime
import _thread as thread
from tqdm import tqdm
import functools
import jiwer

STATUS_FIRST_FRAME = 0  # 第一帧的标识
STATUS_CONTINUE_FRAME = 1  # 中间帧标识
STATUS_LAST_FRAME = 2  # 最后一帧的标识


class Ws_Param(object):
    # 初始化
    def __init__(self, APPID, APIKey, APISecret, AudioFile):
        self.APPID = APPID
        self.APIKey = APIKey
        self.APISecret = APISecret
        self.AudioFile = AudioFile

        # 公共参数(common)
        self.CommonArgs = {"app_id": self.APPID}
        # 业务参数(business)，更多个性化参数可在官网查看
        self.BusinessArgs = {
            "domain": "iat",
            "language": "zh_cn",
            "accent": "mandarin",
            "vinfo": 1,
            "vad_eos": 10000,
        }

    # 生成url
    def create_url(self):
        url = "wss://ws-api.xfyun.cn/v2/iat"
        # 生成RFC1123格式的时间戳
        now = datetime.now()
        date = format_date_time(mktime(now.timetuple()))

        # 拼接字符串
        signature_origin = "host: " + "ws-api.xfyun.cn" + "\n"
        signature_origin += "date: " + date + "\n"
        signature_origin += "GET " + "/v2/iat " + "HTTP/1.1"
        # 进行hmac-sha256进行加密
        signature_sha = hmac.new(
            self.APISecret.encode("utf-8"),
            signature_origin.encode("utf-8"),
            digestmod=hashlib.sha256,
        ).digest()
        signature_sha = base64.b64encode(signature_sha).decode(encoding="utf-8")

        authorization_origin = 'api_key="%s", algorithm="%s", headers="%s", signature="%s"' % (
            self.APIKey,
            "hmac-sha256",
            "host date request-line",
            signature_sha,
        )
        authorization = base64.b64encode(authorization_origin.encode("utf-8")).decode(
            encoding="utf-8"
        )
        # 将请求的鉴权参数组合为字典
        v = {"authorization": authorization, "date": date, "host": "ws-api.xfyun.cn"}
        # 拼接鉴权参数，生成url
        url = url + "?" + urlencode(v)
        # print("date: ",date)
        # print("v: ",v)
        # 此处打印出建立连接时候的url,参考本demo的时候可取消上方打印的注释，比对相同参数时生成的url与自己代码生成的url是否一致
        # print('websocket url :', url)
        return url


# 收到websocket消息的处理
def on_message(ws, message, txts=None):
    try:
        code = json.loads(message)["code"]
        sid = json.loads(message)["sid"]
        if code != 0:
            errMsg = json.loads(message)["message"]
            print("sid:%s call error:%s code is:%s" % (sid, errMsg, code))

        else:
            data = json.loads(message)["data"]["result"]["ws"]
            # print(json.loads(message))
            result = ""
            for i in data:
                for w in i["cw"]:
                    result += w["w"]
            if txts is not None:
                txts.append(result)
            # print("sid:%s call success!,data is:%s" % (sid, json.dumps(data, ensure_ascii=False)))

    except Exception as e:
        print("receive msg,but parse exception:", e)


# 收到websocket错误的处理
def on_error(ws, error):
    print("### error:", error)


# 收到websocket关闭的处理
def on_close(ws):
    print("### closed ###")


# 收到websocket连接建立的处理
def on_open(ws):
    def run(*args):
        frameSize = 8000  # 每一帧的音频大小
        intervel = 0.04  # 发送音频间隔(单位:s)
        status = STATUS_FIRST_FRAME  # 音频的状态信息，标识音频是第一帧，还是中间帧、最后一帧

        with open(wsParam.AudioFile, "rb") as fp:
            while True:
                buf = fp.read(frameSize)
                # 文件结束
                if not buf:
                    status = STATUS_LAST_FRAME
                # 第一帧处理
                # 发送第一帧音频，带business 参数
                # appid 必须带上，只需第一帧发送
                if status == STATUS_FIRST_FRAME:

                    d = {
                        "common": wsParam.CommonArgs,
                        "business": wsParam.BusinessArgs,
                        "data": {
                            "status": 0,
                            "format": "audio/L16;rate=16000",
                            "audio": str(base64.b64encode(buf), "utf-8"),
                            "encoding": "raw",
                        },
                    }
                    d = json.dumps(d)
                    ws.send(d)
                    status = STATUS_CONTINUE_FRAME
                # 中间帧处理
                elif status == STATUS_CONTINUE_FRAME:
                    d = {
                        "data": {
                            "status": 1,
                            "format": "audio/L16;rate=16000",
                            "audio": str(base64.b64encode(buf), "utf-8"),
                            "encoding": "raw",
                        }
                    }
                    ws.send(json.dumps(d))
                # 最后一帧处理
                elif status == STATUS_LAST_FRAME:
                    d = {
                        "data": {
                            "status": 2,
                            "format": "audio/L16;rate=16000",
                            "audio": str(base64.b64encode(buf), "utf-8"),
                            "encoding": "raw",
                        }
                    }
                    ws.send(json.dumps(d))
                    time.sleep(1)
                    break
                # 模拟音频采样间隔
                time.sleep(intervel)
        ws.close()

    thread.start_new_thread(run, ())


if __name__ == "__main__":
    # 测试时候在此处正确填写相关信息即可运行
    input_audios = "./audios"
    input_trans = "./ref_trans.txt"

    wavs = sorted(glob.glob(os.path.join(input_audios, "*.wav")))
    txts = []
    on_message = functools.partial(on_message, txts=txts)
    for wav in tqdm(wavs, desc="recognizing the audios: "):
        wsParam = Ws_Param(
            APPID="7e49d968",
            APISecret="ZGYzYWVhNjBlM2ExNzgyOThjMjhhMWQ5",
            APIKey="12474b34b6852293003c91dbe9c9dfb0",
            AudioFile=wav,
        )
        websocket.enableTrace(False)
        wsUrl = wsParam.create_url()
        ws = websocket.WebSocketApp(
            wsUrl, on_message=on_message, on_error=on_error, on_close=on_close
        )
        ws.on_open = on_open
        ws.run_forever(sslopt={"cert_reqs": ssl.CERT_NONE})

    # 开始计算WER
    del_symblos = re.compile(r"[^\u4e00-\u9fa5]+")
    asr_trans = []
    for txt in txts:
        sentence = re.sub(del_symblos, "", txt)
        if sentence != "":
            sentence = list(sentence)
            sentence = " ".join(sentence)
            asr_trans.append(sentence)

    ref_trans = []
    with open(input_trans) as f:
        for line in f:
            sentence = line.strip()
            sentence = re.sub(del_symblos, "", sentence)
            sentence = list(sentence)
            sentence = " ".join(sentence)
            ref_trans.append(sentence)

    assert len(asr_trans) == len(ref_trans)
    wer = jiwer.wer(ref_trans, asr_trans)
    print(f"检测词错误率为：{wer}")