[DllImport("g729.dll")]
        public static extern void va_g729a_init_encoder();
        [DllImport("g729.dll")]
        public static extern void va_g729a_init_decoder();
        [DllImport("g729.dll")]
        public static extern void va_g729a_encoder(byte[] inputByte, byte[] outputByte);
        [DllImport("g729.dll")]
        public static extern void va_g729a_decoder(byte[] inputByte, byte[] outputByte);
//G729初始化

//G729编码
byte[] temp = capturedata;//已经得到的本地音频流
            va_g729a_encoder(temp, capturedata);

//G729解码
va_g729a_decoder(temp, capturedata);