# robot.sdk.XunfeiSpeech 源代码

    import websocket
    import hashlib
    import base64
    import hmac
    import json
    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 robot import logging
    logger = logging.getLogger(__name__)

    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

    wsParam = None
    gResult = ''

    class Ws_Param(object):
        # 初始化
        def __init__(self, APPID, APIKey, APISecret, AudioFile):
            # 控制台鉴权信息
            self.APPID = APPID
            self.APIKey = APIKey
            self.APISecret = APISecret

            # 固定参数，可不用修改
            self.Host = "iat-api.xfyun.cn/v2/iat"
            self.HttpProto = "HTTP/1.1"
            self.HttpMethod = "GET"
            self.RequestUri = "/v2/iat"
            self.Algorithm = "hmac-sha256"
            self.url = "wss://" + self.Host + self.RequestUri

            # 设置测试音频文件
            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"}

        # 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)
            # 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
            logger.debug('websocket url :', url)
            return url

    # 收到websocket消息的处理
    def on_message(ws, message):
        global gResult
        try:
            code = json.loads(message)["code"]
            sid = json.loads(message)["sid"]
            if code != 0:
                errMsg = json.loads(message)["message"]
                logger.critical("xunfei-asr 识别出错了：sid:%s call error:%s code is:%s" % (sid, errMsg, code))
            else:
                data = json.loads(message)["data"]["result"]["ws"]
                result = ""
                for i in data:
                    for w in i["cw"]:
                        result += w["w"]
                gResult = gResult + result
                logger.info("sid:%s call success!,data is:%s" % (sid, json.dumps(data, ensure_ascii=False)))
        except Exception as e:
            logger.critical("xunfei-asr 识别出错了：", e)

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

    # 收到websocket关闭的处理
    def on_close(ws):
        logger.debug("### closed ###")

    # 收到websocket连接建立的处理
    def on_open(ws):
        global wsParam
        def run(*args):
            frameSize = 1220  # 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, ())

    def transcribe(fpath, appid, api_key, api_secret):
        """
        科大讯飞ASR
        """
        global wsParam, gResult
        gResult = ''
        wsParam = Ws_Param(appid, api_key, APISecret=api_secret, AudioFile=fpath)
        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})
        return gResult