1 /* 2 * Copyright (c) 2021 Bestechnic (Shanghai) Co., Ltd. All rights reserved. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 #ifndef __USB_AUDIO_SYNC_H__ 16 #define __USB_AUDIO_SYNC_H__ 17 18 #ifdef __cplusplus 19 extern "C" { 20 #endif 21 22 #include "plat_types.h" 23 24 typedef uint32_t (*USB_AUDIO_SYNC_TIME_TO_MS)(uint32_t time); 25 26 enum UAUD_SYNC_RET_T { 27 UAUD_SYNC_IDLE, 28 UAUD_SYNC_START, 29 UAUD_SYNC_ERR, 30 }; 31 32 struct USB_AUDIO_STREAM_INFO_T { 33 // Difference error threshold 34 uint16_t err_thresh; 35 // Difference synchronization threshold 36 uint16_t sync_thresh; 37 // Sample rate 38 uint32_t samp_rate; 39 // Total sample count of the buffer 40 uint32_t samp_cnt; 41 // The number of value to calculate the average 42 uint8_t diff_avg_cnt; 43 // The stream info ID 44 uint8_t id; 45 // Whether to enable diff_target 46 uint8_t diff_target_enabled; 47 // The Max adjust ratio moving to diff_target 48 float max_target_ratio; 49 // The abosulte difference value between current diff and diff_target to apply max_target_ratio 50 uint32_t max_target_thresh; 51 // The target of the difference 52 int diff_target; 53 // Function to convert timestamp to ms. If NULL, default timer will be used. 54 USB_AUDIO_SYNC_TIME_TO_MS time_to_ms; 55 // Current timestamp. If time_to_ms is NULL, this member will be ignored. 56 uint32_t time; 57 // Internal control block 58 uint32_t ctrl_block[8]; 59 }; 60 61 void usb_audio_sync_reset(struct USB_AUDIO_STREAM_INFO_T *info); 62 63 int usb_audio_sync_normalize_diff(int diff, uint32_t size); 64 65 enum UAUD_SYNC_RET_T usb_audio_sync(uint32_t pos_a, uint32_t pos_b, struct USB_AUDIO_STREAM_INFO_T *info, float *p_ratio); 66 67 #ifdef __cplusplus 68 } 69 #endif 70 71 #endif 72