How to change pwm polarity or PWM mode after each DMA cycle.

I am using STM32F103C8T6, timer 1 ch 1 to generate complementary PWM

with variable duty cycle Using DMA buffer

 HAL_TIM_Base_Start(&htim1);
 HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_1, (uint32_t *) base, 30);
 HAL_TIMEx_PWMN_Start(&htim1, TIM_CHANNEL_1);

Now i want to invert PWM polarity or PWM mode after each DMA transfer.

without changing Phase of PWM.

Thanks.