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Version : V005              Date:2020-12-15

整理代码，节省iram空间



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Version : V004              Date:2020-11-21

drc lib 修改下面接口：

void optek_drc_vol_set_drc (void *handle,  int attack_threshold, int release_threshold, int attack_rate, int release_rate,
							int lev_detect_release_time,
					 uint8_t clipping_enable, uint8_t update_samples);
-->
void optek_drc_vol_set_drc (void *handle,  int attack_threshold, int release_threshold, int attack_rate, int release_rate,
							int lev_detect_release_time,
					 uint8_t clipping_enable, uint8_t update_samples,uint32_t attack_hold_samples);


新参数 attack_hold_samples，单位是 samples,意思是压缩维持时间