silk/API.h

/***********************************************************************
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***********************************************************************/

#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_int32                      *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                       */
);

#if 0
/**************************************/
/* 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                             */
);
#endif

#ifdef __cplusplus
}
#endif

#endif