1 /* SPDX-License-Identifier: BSD-3-Clause 2 * 3 * Copyright(c) 2020 Google LLC. All rights reserved. 4 * 5 * Author: Sebastiano Carlucci <scarlucci@google.com> 6 */ 7 8 #ifndef __SOF_AUDIO_DCBLOCK_DCBLOCK_H__ 9 #define __SOF_AUDIO_DCBLOCK_DCBLOCK_H__ 10 11 #include <stdint.h> 12 #include <sof/platform.h> 13 #include <ipc/stream.h> 14 15 struct audio_stream; 16 struct comp_dev; 17 18 struct dcblock_state { 19 int32_t x_prev; /**< state variable referring to x[n-1] */ 20 int32_t y_prev; /**< state variable referring to y[n-1] */ 21 }; 22 23 /** 24 * \brief Type definition for the processing function for the 25 * DC Blocking Filter. 26 */ 27 typedef void (*dcblock_func)(const struct comp_dev *dev, 28 const struct audio_stream *source, 29 const struct audio_stream *sink, 30 uint32_t frames); 31 32 /* DC Blocking Filter component private data */ 33 struct comp_data { 34 /**< filters state */ 35 struct dcblock_state state[PLATFORM_MAX_CHANNELS]; 36 37 /** coefficients for the processing function */ 38 int32_t R_coeffs[PLATFORM_MAX_CHANNELS]; 39 40 enum sof_ipc_frame source_format; 41 enum sof_ipc_frame sink_format; 42 dcblock_func dcblock_func; /**< processing function */ 43 }; 44 45 /** \brief DC Blocking Filter processing functions map item. */ 46 struct dcblock_func_map { 47 enum sof_ipc_frame src_fmt; /**< source frame format */ 48 dcblock_func func; /**< processing function */ 49 }; 50 51 /** \brief Map of formats with dedicated processing functions. */ 52 extern const struct dcblock_func_map dcblock_fnmap[]; 53 54 /** \brief Number of processing functions. */ 55 extern const size_t dcblock_fncount; 56 57 /** 58 * \brief Retrieves a DC Blocking processing function matching 59 * the source buffer's frame format. 60 * \param src_fmt the frames' format of the source buffer 61 */ dcblock_find_func(enum sof_ipc_frame src_fmt)62static inline dcblock_func dcblock_find_func(enum sof_ipc_frame src_fmt) 63 { 64 int i; 65 66 /* Find suitable processing function from map */ 67 for (i = 0; i < dcblock_fncount; i++) { 68 if (src_fmt == dcblock_fnmap[i].src_fmt) 69 return dcblock_fnmap[i].func; 70 } 71 72 return NULL; 73 } 74 75 #endif /* __SOF_AUDIO_DCBLOCK_DCBLOCK_H__ */ 76
