1 /* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 12 #ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_CNG_MAIN_INTERFACE_WEBRTC_CNG_H_ 13 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_CNG_MAIN_INTERFACE_WEBRTC_CNG_H_ 14 15 #include "webrtc/typedefs.h" 16 17 #ifdef __cplusplus 18 extern "C" { 19 #endif 20 21 #define WEBRTC_CNG_MAX_LPC_ORDER 12 22 #define WEBRTC_CNG_MAX_OUTSIZE_ORDER 640 23 24 /* Define Error codes. */ 25 26 /* 6100 Encoder */ 27 #define CNG_ENCODER_NOT_INITIATED 6120 28 #define CNG_DISALLOWED_LPC_ORDER 6130 29 #define CNG_DISALLOWED_FRAME_SIZE 6140 30 #define CNG_DISALLOWED_SAMPLING_FREQUENCY 6150 31 /* 6200 Decoder */ 32 #define CNG_DECODER_NOT_INITIATED 6220 33 34 typedef struct WebRtcCngEncInst CNG_enc_inst; 35 typedef struct WebRtcCngDecInst CNG_dec_inst; 36 37 /**************************************************************************** 38 * WebRtcCng_CreateEnc/Dec(...) 39 * 40 * These functions create an instance to the specified structure 41 * 42 * Input: 43 * - XXX_inst : Pointer to created instance that should be created 44 * 45 * Return value : 0 - Ok 46 * -1 - Error 47 */ 48 int16_t WebRtcCng_CreateEnc(CNG_enc_inst** cng_inst); 49 int16_t WebRtcCng_CreateDec(CNG_dec_inst** cng_inst); 50 51 /**************************************************************************** 52 * WebRtcCng_InitEnc/Dec(...) 53 * 54 * This function initializes a instance 55 * 56 * Input: 57 * - cng_inst : Instance that should be initialized 58 * 59 * - fs : 8000 for narrowband and 16000 for wideband 60 * - interval : generate SID data every interval ms 61 * - quality : Number of refl. coefs, maximum allowed is 12 62 * 63 * Output: 64 * - cng_inst : Initialized instance 65 * 66 * Return value : 0 - Ok 67 * -1 - Error 68 */ 69 70 int16_t WebRtcCng_InitEnc(CNG_enc_inst* cng_inst, uint16_t fs, int16_t interval, 71 int16_t quality); 72 int16_t WebRtcCng_InitDec(CNG_dec_inst* cng_inst); 73 74 /**************************************************************************** 75 * WebRtcCng_FreeEnc/Dec(...) 76 * 77 * These functions frees the dynamic memory of a specified instance 78 * 79 * Input: 80 * - cng_inst : Pointer to created instance that should be freed 81 * 82 * Return value : 0 - Ok 83 * -1 - Error 84 */ 85 int16_t WebRtcCng_FreeEnc(CNG_enc_inst* cng_inst); 86 int16_t WebRtcCng_FreeDec(CNG_dec_inst* cng_inst); 87 88 /**************************************************************************** 89 * WebRtcCng_Encode(...) 90 * 91 * These functions analyzes background noise 92 * 93 * Input: 94 * - cng_inst : Pointer to created instance 95 * - speech : Signal to be analyzed 96 * - nrOfSamples : Size of speech vector 97 * - forceSID : not zero to force SID frame and reset 98 * 99 * Output: 100 * - bytesOut : Nr of bytes to transmit, might be 0 101 * 102 * Return value : 0 - Ok 103 * -1 - Error 104 */ 105 int16_t WebRtcCng_Encode(CNG_enc_inst* cng_inst, int16_t* speech, 106 int16_t nrOfSamples, uint8_t* SIDdata, 107 int16_t* bytesOut, int16_t forceSID); 108 109 /**************************************************************************** 110 * WebRtcCng_UpdateSid(...) 111 * 112 * These functions updates the CN state, when a new SID packet arrives 113 * 114 * Input: 115 * - cng_inst : Pointer to created instance that should be freed 116 * - SID : SID packet, all headers removed 117 * - length : Length in bytes of SID packet 118 * 119 * Return value : 0 - Ok 120 * -1 - Error 121 */ 122 int16_t WebRtcCng_UpdateSid(CNG_dec_inst* cng_inst, uint8_t* SID, 123 int16_t length); 124 125 /**************************************************************************** 126 * WebRtcCng_Generate(...) 127 * 128 * These functions generates CN data when needed 129 * 130 * Input: 131 * - cng_inst : Pointer to created instance that should be freed 132 * - outData : pointer to area to write CN data 133 * - nrOfSamples : How much data to generate 134 * - new_period : >0 if a new period of CNG, will reset history 135 * 136 * Return value : 0 - Ok 137 * -1 - Error 138 */ 139 int16_t WebRtcCng_Generate(CNG_dec_inst* cng_inst, int16_t* outData, 140 int16_t nrOfSamples, int16_t new_period); 141 142 /***************************************************************************** 143 * WebRtcCng_GetErrorCodeEnc/Dec(...) 144 * 145 * This functions can be used to check the error code of a CNG instance. When 146 * a function returns -1 a error code will be set for that instance. The 147 * function below extract the code of the last error that occurred in the 148 * specified instance. 149 * 150 * Input: 151 * - CNG_inst : CNG enc/dec instance 152 * 153 * Return value : Error code 154 */ 155 int16_t WebRtcCng_GetErrorCodeEnc(CNG_enc_inst* cng_inst); 156 int16_t WebRtcCng_GetErrorCodeDec(CNG_dec_inst* cng_inst); 157 158 #ifdef __cplusplus 159 } 160 #endif 161 162 #endif // WEBRTC_MODULES_AUDIO_CODING_CODECS_CNG_MAIN_INTERFACE_WEBRTC_CNG_H_ 163
