| /* st_buffering.h |
| * |
| * This file contains a sound trigger buffer abstraction. This |
| * abstraction represents a single circular buffer that is shared |
| * among various threads in the sound trigger HAL. |
| * |
| * Copyright (c) 2019, The Linux Foundation. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * * Neither the name of The Linux Foundation nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef ST_BUFFERING_H |
| #define ST_BUFFERING_H |
| |
| #include <stdint.h> |
| #include <pthread.h> |
| |
| typedef struct st_buffer { |
| pthread_mutex_t lock; |
| uint8_t *buf_start; |
| uint8_t *buf_end; |
| uint8_t *rd_ptr; |
| uint8_t *wr_ptr; |
| uint32_t size; |
| uint32_t unread_bytes; |
| }st_buffer_t; |
| |
| st_buffer_t* st_buffer_init(uint32_t size); |
| void st_buffer_deinit(st_buffer_t *buf_obj); |
| void st_buffer_reset(st_buffer_t *buf_obj); |
| uint8_t* st_buffer_get_wr_ptr(st_buffer_t *buf_obj); |
| int st_buffer_write(st_buffer_t *buf_obj, uint8_t *src, uint32_t size); |
| int st_buffer_read(st_buffer_t *buf_obj, uint8_t *dst, uint32_t size, |
| uint8_t **rd_ptr, bool flush); |
| void st_buffer_flush(st_buffer_t *buf_obj, uint32_t size); |
| |
| #endif /* ST_BUFFERING_H */ |