34efc689c2
This new lib contains the bare minimum to implement an iSAC encoder and decoder. The webrtc files have been copied from the revision as the existing imported files (c8b569e0a7ad0b369e15f0197b3a558699ec8efa).
164 lines
5.2 KiB
C
164 lines
5.2 KiB
C
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_CNG_MAIN_INCLUDE_WEBRTC_CNG_H_
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#define WEBRTC_MODULES_AUDIO_CODING_CODECS_CNG_MAIN_INCLUDE_WEBRTC_CNG_H_
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#include <stddef.h>
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#include "webrtc/typedefs.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define WEBRTC_CNG_MAX_LPC_ORDER 12
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#define WEBRTC_CNG_MAX_OUTSIZE_ORDER 640
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/* Define Error codes. */
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/* 6100 Encoder */
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#define CNG_ENCODER_NOT_INITIATED 6120
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#define CNG_DISALLOWED_LPC_ORDER 6130
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#define CNG_DISALLOWED_FRAME_SIZE 6140
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#define CNG_DISALLOWED_SAMPLING_FREQUENCY 6150
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/* 6200 Decoder */
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#define CNG_DECODER_NOT_INITIATED 6220
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typedef struct WebRtcCngEncInst CNG_enc_inst;
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typedef struct WebRtcCngDecInst CNG_dec_inst;
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/****************************************************************************
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* WebRtcCng_CreateEnc/Dec(...)
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*
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* These functions create an instance to the specified structure
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*
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* Input:
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* - XXX_inst : Pointer to created instance that should be created
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*
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* Return value : 0 - Ok
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* -1 - Error
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*/
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int16_t WebRtcCng_CreateEnc(CNG_enc_inst** cng_inst);
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int16_t WebRtcCng_CreateDec(CNG_dec_inst** cng_inst);
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/****************************************************************************
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* WebRtcCng_InitEnc/Dec(...)
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*
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* This function initializes a instance
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*
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* Input:
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* - cng_inst : Instance that should be initialized
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*
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* - fs : 8000 for narrowband and 16000 for wideband
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* - interval : generate SID data every interval ms
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* - quality : Number of refl. coefs, maximum allowed is 12
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*
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* Output:
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* - cng_inst : Initialized instance
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*
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* Return value : 0 - Ok
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* -1 - Error
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*/
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int WebRtcCng_InitEnc(CNG_enc_inst* cng_inst, int fs, int16_t interval,
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int16_t quality);
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void WebRtcCng_InitDec(CNG_dec_inst* cng_inst);
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/****************************************************************************
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* WebRtcCng_FreeEnc/Dec(...)
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*
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* These functions frees the dynamic memory of a specified instance
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*
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* Input:
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* - cng_inst : Pointer to created instance that should be freed
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*
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* Return value : 0 - Ok
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* -1 - Error
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*/
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int16_t WebRtcCng_FreeEnc(CNG_enc_inst* cng_inst);
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int16_t WebRtcCng_FreeDec(CNG_dec_inst* cng_inst);
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/****************************************************************************
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* WebRtcCng_Encode(...)
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*
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* These functions analyzes background noise
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*
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* Input:
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* - cng_inst : Pointer to created instance
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* - speech : Signal to be analyzed
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* - nrOfSamples : Size of speech vector
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* - forceSID : not zero to force SID frame and reset
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*
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* Output:
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* - bytesOut : Nr of bytes to transmit, might be 0
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*
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* Return value : 0 - Ok
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* -1 - Error
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*/
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int WebRtcCng_Encode(CNG_enc_inst* cng_inst, int16_t* speech,
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size_t nrOfSamples, uint8_t* SIDdata,
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size_t* bytesOut, int16_t forceSID);
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/****************************************************************************
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* WebRtcCng_UpdateSid(...)
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*
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* These functions updates the CN state, when a new SID packet arrives
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*
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* Input:
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* - cng_inst : Pointer to created instance that should be freed
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* - SID : SID packet, all headers removed
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* - length : Length in bytes of SID packet
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*
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* Return value : 0 - Ok
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* -1 - Error
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*/
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int16_t WebRtcCng_UpdateSid(CNG_dec_inst* cng_inst, uint8_t* SID,
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size_t length);
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/****************************************************************************
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* WebRtcCng_Generate(...)
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*
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* These functions generates CN data when needed
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*
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* Input:
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* - cng_inst : Pointer to created instance that should be freed
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* - outData : pointer to area to write CN data
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* - nrOfSamples : How much data to generate
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* - new_period : >0 if a new period of CNG, will reset history
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*
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* Return value : 0 - Ok
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* -1 - Error
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*/
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int16_t WebRtcCng_Generate(CNG_dec_inst* cng_inst, int16_t* outData,
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size_t nrOfSamples, int16_t new_period);
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/*****************************************************************************
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* WebRtcCng_GetErrorCodeEnc/Dec(...)
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*
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* This functions can be used to check the error code of a CNG instance. When
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* a function returns -1 a error code will be set for that instance. The
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* function below extract the code of the last error that occurred in the
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* specified instance.
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*
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* Input:
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* - CNG_inst : CNG enc/dec instance
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*
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* Return value : Error code
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*/
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int16_t WebRtcCng_GetErrorCodeEnc(CNG_enc_inst* cng_inst);
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int16_t WebRtcCng_GetErrorCodeDec(CNG_dec_inst* cng_inst);
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#ifdef __cplusplus
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}
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#endif
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#endif // WEBRTC_MODULES_AUDIO_CODING_CODECS_CNG_MAIN_INCLUDE_WEBRTC_CNG_H_
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