下载语音（方式1）

your_json_string = {
    "TypeName": "AddMsg",
    "Token": "wx_XXXXXXXXXXXXXXXXXXXX",
    "RobotId": "wxid_cnw193tl86kx22",
    "Data": {
        "MsgId": 1982117382,
        "FromUserName": {
            "string": "wx_XXXXXXXXXXXXXXXXXXXX"
        },
        "ToUserName": {
            "string": "wx_XXXXXXXXXXXXXXXXXXXX"
        },
        "MsgType": 34,
        "Content": {
            "string": "<msg><voicemsg endflag=\"1\" cancelflag=\"0\" forwardflag=\"0\" voiceformat=\"4\" voicelength=\"3538\" length=\"5073\" bufid=\"0\" aeskey=\"db7653b8ccc608779d02d7899d47db07\" voiceurl=\"3052020100044b304902010002042b0a4c3002032df66b020416a29624020468f9d0bd042434363363376439312d643533302d343966622d616230652d38303834646666393264366302040514000f0201000400\" voicemd5=\"\" clientmsgid=\"4137373133373132396531393534320044145210232517021447106103\" fromusername=\"wxid_o9jco5r4p63l22\" /></msg>"
        },
        "Status": 3,
        "ImgStatus": 1,
        "ImgBuf": {
            "iLen": 5073,
            "buffer": "AiMhU0lMS19WMwwApyt096juSeXgI3BDCwCnK3T3qZynot6..."
		},
        "CreateTime": 1761202365,
        "MsgSource": "<msgsource>\n\t<signature>N0_V1_2sMj7gn2|v1_B+FpIeOL</signature>\n\t<tmp_node>\n\t\t<publisher-id></publisher-id>\n\t</tmp_node>\n</msgsource>\n",
        "PushContent": "马工 : [语音]",
        "NewMsgId": 2521556453164743047,
        "MsgSeq": 817381383
    }
}

import base64
import json

# 从JSON中提取ImgBuf的base64数据
data = json.loads(your_json_string)

img_buf_base64 = data['Data']['ImgBuf']['buffer']

# 解码base64并保存为音频文件(存储为silk文件到本地)!
audio_data = base64.b64decode(img_buf_base64)
with open('../path/fileos/audio.silk', 'wb') as f:
    f.write(audio_data)