1 /* 2 * Copyright (C) 2016 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 /* 39 * btstack_cvsd_plc.h 40 * 41 */ 42 43 #ifndef BTSTACK_CVSD_PLC_H 44 #define BTSTACK_CVSD_PLC_H 45 46 #include <stdint.h> 47 48 #if defined __cplusplus 49 extern "C" { 50 #endif 51 52 #define BTSTACK_CVSD_PLC_SAMPLE_FORMAT int16_t 53 54 #define CVSD_FS 60 /* CVSD Frame Size */ 55 #define CVSD_N 256 /* Window Length for pattern matching */ 56 #define CVSD_M 32 /* Template for matching */ 57 #define CVSD_LHIST (CVSD_N+CVSD_FS-1) /* Length of history buffer required */ 58 #define CVSD_RT 18 /* Reconvergence Time (samples) */ 59 #define CVSD_OLAL 8 /* OverLap-Add Length (samples) */ 60 61 /* PLC State Information */ 62 typedef struct cvsd_plc_state { 63 int16_t hist[CVSD_LHIST+CVSD_FS+CVSD_RT+CVSD_OLAL]; 64 int16_t bestlag; 65 int nbf; 66 67 // number processed samples 68 uint32_t good_samples; 69 70 // summary of processed good and bad frames 71 int good_frames_nr; 72 int bad_frames_nr; 73 int zero_frames_nr; 74 int frame_count; 75 int max_consecutive_bad_frames_nr; 76 } btstack_cvsd_plc_state_t; 77 78 // All int16 audio samples are in host endiness 79 void btstack_cvsd_plc_init(btstack_cvsd_plc_state_t *plc_state); 80 void btstack_cvsd_plc_bad_frame(btstack_cvsd_plc_state_t *plc_state, uint16_t num_samples, int16_t *out); 81 void btstack_cvsd_plc_good_frame(btstack_cvsd_plc_state_t *plc_state, uint16_t num_samples, int16_t *in, int16_t *out); 82 void btstack_cvsd_plc_process_data(btstack_cvsd_plc_state_t * state, int16_t * in, uint16_t num_samples, int16_t * out); 83 void btstack_cvsd_dump_statistics(btstack_cvsd_plc_state_t * state); 84 85 // testing only 86 int btstack_cvsd_plc_pattern_match(BTSTACK_CVSD_PLC_SAMPLE_FORMAT *y); 87 float btstack_cvsd_plc_amplitude_match(btstack_cvsd_plc_state_t *plc_state, uint16_t num_samples, BTSTACK_CVSD_PLC_SAMPLE_FORMAT *y, BTSTACK_CVSD_PLC_SAMPLE_FORMAT bestmatch); 88 BTSTACK_CVSD_PLC_SAMPLE_FORMAT btstack_cvsd_plc_crop_sample(float val); 89 float btstack_cvsd_plc_rcos(int index); 90 91 #ifdef OCTAVE_OUTPUT 92 void btstack_cvsd_plc_octave_set_base_name(const char * name); 93 #endif 94 95 #if defined __cplusplus 96 } 97 #endif 98 99 #endif // BTSTACK_CVSD_PLC_H 100