opus/silk/API.h

/***********************************************************************
Copyright (c) 2006-2012 IETF Trust and Skype Limited. All rights reserved.

This file is extracted from RFC6716. Please see that RFC for additional
information.

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 Internet Society, IETF or IETF Trust, nor the
names of specific contributors, may be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/

#ifndef SILK_API_H
#define SILK_API_H

#include "control.h"
#include "typedef.h"
#include "errors.h"
#include "entenc.h"
#include "entdec.h"

#ifdef __cplusplus
extern "C"
{
#endif

#define SILK_MAX_FRAMES_PER_PACKET  3

/* Struct for TOC (Table of Contents) */
typedef struct {
    opus_int    VADFlag;                                /* Voice activity for packet                            */
    opus_int    VADFlags[ SILK_MAX_FRAMES_PER_PACKET ]; /* Voice activity for each frame in packet              */
    opus_int    inbandFECFlag;                          /* Flag indicating if packet contains in-band FEC       */
} silk_TOC_struct;

/****************************************/
/* Encoder functions                    */
/****************************************/

/***********************************************/
/* Get size in bytes of the Silk encoder state */
/***********************************************/
opus_int silk_Get_Encoder_Size(                         /* O    Returns error code                              */
    opus_int                        *encSizeBytes       /* O    Number of bytes in SILK encoder state           */
);

/*************************/
/* Init or reset encoder */
/*************************/
opus_int silk_InitEncoder(                              /* O    Returns error code                              */
    void                            *encState,          /* I/O  State                                           */
    silk_EncControlStruct           *encStatus          /* O    Encoder Status                                  */
);

/***************************************/
/* Read control structure from encoder */
/***************************************/
opus_int silk_QueryEncoder(                             /* O    Returns error code                              */
    const void                      *encState,          /* I    State                                           */
    silk_EncControlStruct           *encStatus          /* O    Encoder Status                                  */
);

/**************************/
/* Encode frame with Silk */
/**************************/
/* Note: if prefillFlag is set, the input must contain 10 ms of audio, irrespective of what                     */
/* encControl->payloadSize_ms is set to                                                                         */
opus_int silk_Encode(                                   /* O    Returns error code                              */
    void                            *encState,          /* I/O  State                                           */
    silk_EncControlStruct           *encControl,        /* I    Control status                                  */
    const opus_int16                *samplesIn,         /* I    Speech sample input vector                      */
    opus_int                        nSamplesIn,         /* I    Number of samples in input vector               */
    ec_enc                          *psRangeEnc,        /* I/O  Compressor data structure                       */
    opus_int                        *nBytesOut,         /* I/O  Number of bytes in payload (input: Max bytes)   */
    const opus_int                  prefillFlag         /* I    Flag to indicate prefilling buffers no coding   */
);

/****************************************/
/* Decoder functions                    */
/****************************************/

/***********************************************/
/* Get size in bytes of the Silk decoder state */
/***********************************************/
opus_int silk_Get_Decoder_Size(                         /* O    Returns error code                              */
    opus_int                        *decSizeBytes       /* O    Number of bytes in SILK decoder state           */
);

/*************************/
/* Init or Reset decoder */
/*************************/
opus_int silk_InitDecoder(                              /* O    Returns error code                              */
    void                            *decState           /* I/O  State                                           */
);

/******************/
/* Decode a frame */
/******************/
opus_int silk_Decode(                                   /* O    Returns error code                              */
    void*                           decState,           /* I/O  State                                           */
    silk_DecControlStruct*          decControl,         /* I/O  Control Structure                               */
    opus_int                        lostFlag,           /* I    0: no loss, 1 loss, 2 decode fec                */
    opus_int                        newPacketFlag,      /* I    Indicates first decoder call for this packet    */
    ec_dec                          *psRangeDec,        /* I/O  Compressor data structure                       */
    opus_int16                      *samplesOut,        /* O    Decoded output speech vector                    */
    opus_int32                      *nSamplesOut        /* O    Number of samples decoded                       */
);

/**************************************/
/* Get table of contents for a packet */
/**************************************/
opus_int silk_get_TOC(
    const opus_uint8                *payload,           /* I    Payload data                                */
    const opus_int                  nBytesIn,           /* I    Number of input bytes                       */
    const opus_int                  nFramesPerPayload,  /* I    Number of SILK frames per payload           */
    silk_TOC_struct                 *Silk_TOC           /* O    Type of content                             */
);

#ifdef __cplusplus
}
#endif

#endif