Add encoder for aptX and encoder for aptX HD source code.

/*------------------------------------------------------------------------------

 *

 *  This file exposes a public interface to allow clients to invoke aptX

 *  encoding on 4 new PCM samples, generating 2 new codeword (one for the

 *  left channel and one for the right channel).

 *

 *----------------------------------------------------------------------------*/

#ifndef APTXBTENC_H

#define APTXBTENC_H

#ifdef __cplusplus

extern "C" {

#endif

#ifdef _DLLEXPORT

#define APTXBTENCEXPORT __declspec(dllexport)

#else

#define APTXBTENCEXPORT

#endif

/* SizeofAptxbtenc returns the size (in byte) of the memory

 * allocation required to store the state of the encoder */

APTXBTENCEXPORT int SizeofAptxbtenc(void);

/* aptxbtenc_version can be used to extract the version number

 * of the aptX encoder */

APTXBTENCEXPORT const char* aptxbtenc_version(void);

/* aptxbtenc_init is used to initialise the encoder structure.

 * _state should be a pointer to the encoder structure (stereo).

 * endian represent the endianness of the output data

 * (0=little endian. Big endian otherwise)

 * The function returns 1 if an error occurred during the initialisation.

 * The function returns 0 if no error occurred during the initialisation. */

APTXBTENCEXPORT int aptxbtenc_init(void* _state, short endian);

/* aptxbtenc_setsync_mode is used to initialise the sync mode in the encoder state structure.

 * _state should be a pointer to the encoder structure (stereo, though strictly-speaking it is dual channel).

 * 'sync_mode' is an enumerated type  {stereo=0, dualmono=1, no_sync=2}

 * The function returns 0 if no error occurred during the initialisation. */

APTXBTENCEXPORT int aptxbtenc_setsync_mode(void* _state, int32_t sync_mode);

/* StereoEncode will take 8 audio samples (16-bit per sample)

 * and generate one 32-bit codeword with autosync inserted. */

APTXBTENCEXPORT int aptxbtenc_encodestereo(void* _state, void* _pcmL, void* _pcmR, void* _buffer);

#ifdef __cplusplus

} //  /extern "C"

#endif

#endif //APTXBTENC_H

/*------------------------------------------------------------------------------

 *

 *  All declarations relevant for aptxEncode. This function allows clients

 *  to invoke bt-aptX encoding on 4 new PCM samples,

 *  generating 4 new quantised codes. A separate function allows the

 *  packing of the 4 codes into a 16-bit word.

 *

 *----------------------------------------------------------------------------*/

#ifndef APTXENCODER_H

#define APTXENCODER_H

#ifdef _GCC

  #pragma GCC visibility push(hidden)

#endif

#include "AptxParameters.h"

#include "DitherGenerator.h"

#include "Quantiser.h"

#include "SubbandFunctionsCommon.h"

#include "Qmf.h"

 /* Function to carry out a single-channel aptX encode on 4 new PCM samples */

XBT_INLINE_ void aptxEncode(int32_t pcm[4], Qmf_storage* Qmf_St, Encoder_data* EncoderDataPt)

{

   int32_t predVals[4];

   int32_t qCodes[4];

   int32_t aqmfOutputs[4];

   /* Extract the previous predicted values and quantised codes into arrays */

   for (int i = 0; i < 4; i++)

   {

      predVals[i] = EncoderDataPt->m_SubbandData[i].m_predData.m_predVal;

      qCodes[i] = EncoderDataPt->m_qdata[i].qCode;

   }

   /* Update codeword history, then generate new dither values. */

   EncoderDataPt->m_codewordHistory = xbtEncupdateCodewordHistory(qCodes, EncoderDataPt->m_codewordHistory);

   EncoderDataPt->m_dithSyncRandBit = xbtEncgenerateDither(EncoderDataPt->m_codewordHistory, EncoderDataPt->m_ditherOutputs);

   /* Run the analysis QMF */

   QmfAnalysisFilter(pcm, Qmf_St, predVals, aqmfOutputs);

   /* Run the quantiser for each subband */

   quantiseDifferenceLL(aqmfOutputs[0], EncoderDataPt->m_ditherOutputs[0], EncoderDataPt->m_SubbandData[0].m_iqdata.delta, &EncoderDataPt->m_qdata[0]);

   quantiseDifferenceLH(aqmfOutputs[1], EncoderDataPt->m_ditherOutputs[1], EncoderDataPt->m_SubbandData[1].m_iqdata.delta, &EncoderDataPt->m_qdata[1]);

   quantiseDifferenceHL(aqmfOutputs[2], EncoderDataPt->m_ditherOutputs[2], EncoderDataPt->m_SubbandData[2].m_iqdata.delta, &EncoderDataPt->m_qdata[2]);

   quantiseDifferenceHH(aqmfOutputs[3], EncoderDataPt->m_ditherOutputs[3], EncoderDataPt->m_SubbandData[3].m_iqdata.delta, &EncoderDataPt->m_qdata[3]);

}

XBT_INLINE_ void aptxPostEncode(Encoder_data* EncoderDataPt)

{

   /* Run the remaining subband processing for each subband */

   /* Manual inlining on the 4 subband */

   processSubbandLL(EncoderDataPt->m_qdata[0].qCode,

      EncoderDataPt->m_ditherOutputs[0],

      &EncoderDataPt->m_SubbandData[0],

      &EncoderDataPt->m_SubbandData[0].m_iqdata);

   processSubband(EncoderDataPt->m_qdata[1].qCode,

      EncoderDataPt->m_ditherOutputs[1],

      &EncoderDataPt->m_SubbandData[1],

      &EncoderDataPt->m_SubbandData[1].m_iqdata);

   processSubbandHL(EncoderDataPt->m_qdata[2].qCode,

      EncoderDataPt->m_ditherOutputs[2],

      &EncoderDataPt->m_SubbandData[2],

      &EncoderDataPt->m_SubbandData[2].m_iqdata);

   processSubband(EncoderDataPt->m_qdata[3].qCode,

      EncoderDataPt->m_ditherOutputs[3],

      &EncoderDataPt->m_SubbandData[3],

      &EncoderDataPt->m_SubbandData[3].m_iqdata);

}

#ifdef _GCC

  #pragma GCC visibility pop

#endif

#endif //APTXENCODER_H

/*------------------------------------------------------------------------------

 *

 *  General shared aptX parameters.

 *

 *----------------------------------------------------------------------------*/

#ifndef APTXPARAMETERS_H

#define APTXPARAMETERS_H

#ifdef _GCC

  #pragma GCC visibility push(hidden)

#endif

#include <stdint.h>

#include "CBStruct.h"

#if defined _MSC_VER

   #define XBT_INLINE_ inline

   #define _STDQMFOUTERCOEFF 1

#elif defined  __clang__

   #define XBT_INLINE_ static inline

   #define _STDQMFOUTERCOEFF 1

#elif defined __GNUC__

   #define XBT_INLINE_ inline

   #define _STDQMFOUTERCOEFF 1

#else

   #define XBT_INLINE_ static

   #define _STDQMFOUTERCOEFF 1

#endif

/* Signed saturate to a 24bit value */

XBT_INLINE_ int32_t ssat24(int32_t val)

{

   if (val > 8388607)  val = 8388607;

   if (val < -8388608) val = -8388608;

   return val;

}

typedef union u_reg64

{

   uint64_t u64;

   int64_t s64;

   struct s_u32

   {

#ifdef __BIGENDIAN

      uint32_t h;

      uint32_t l;

#else

      uint32_t l;

      uint32_t h;

#endif

   } u32;

   struct s_s32

   {

#ifdef __BIGENDIAN

      int32_t h;

      int32_t l;

#else

      int32_t l;

      int32_t h;

#endif

   } s32;

} reg64_t;

typedef union u_reg32

{

   uint32_t u32;

   int32_t s32;

   struct s_u16

   {

#ifdef __BIGENDIAN

      uint16_t h;

      uint16_t l;

#else

      uint16_t l;

      uint16_t h;

#endif

   } u16;

   struct s_s16

   {

#ifdef __BIGENDIAN

      int16_t h;

      int16_t l;

#else

      int16_t l;

      int16_t h;

#endif

   } s16;

} reg32_t;

/* Each aptX enc/dec round consumes/produces 4 PCM samples */

static const uint32_t numPcmSamples = 4;

/* Symbolic constants for PCM data indicies. */

enum {FirstPcm=0, SecondPcm=1, ThirdPcm=2, FourthPcm=3};

/* Symbolic constants for sync modes. */

enum {stereo=0, dualmono=1, no_sync=2};

/* Number of subbands is fixed at 4 */

#define NUMSUBBANDS 4

/* Symbolic constants for subband identification. */

typedef enum {LL=0, LH=1, HL=2, HH=3}  bands;

/* Structure declaration to bind a set of subband parameters */

typedef struct

{

  const int32_t* threshTable;

  const int32_t* threshTable_sl1;

  const int32_t* dithTable;

  const int32_t* dithTable_sh1;

  const int32_t* minusLambdaDTable;

  const int32_t* incrTable;

  int32_t numBits;

  int32_t maxLogDelta;

  int32_t minLogDelta;

  int32_t numZeros;

} SubbandParameters;

/* Struct required for the polecoeffcalculator function of bt-aptX encoder and decoder*/

/* Size of structure: 16 Bytes */

typedef struct

{

   /* 2-tap delay line for previous sgn values */

   reg32_t m_poleAdaptDelayLine;

   /* 2 pole filter coeffs */

   int32_t m_poleCoeff[2];

} PoleCoeff_data;

/* Struct required for the zerocoeffcalculator function of bt-aptX encoder and decoder*/

/* Size of structure: 100 Bytes */

typedef struct

{

   /* The zero filter length for this subband */

   int32_t m_numZeros;

   /* Maximum number of zeros for any subband is 24. */

   /* 24 zero filter coeffs */

   int32_t m_zeroCoeff[24];

} ZeroCoeff_data;

/* Struct required for the prediction filtering function of bt-aptX encoder and decoder*/

/* Size of structure: 200+20=220 Bytes */

typedef struct

{

   /* Number of zeros associated with this subband */

   int32_t m_numZeros;

   /* Zero data delay line (circular) */

   circularBuffer m_zeroDelayLine;

   /* 2-tap pole data delay line */

   int32_t m_poleDelayLine[2];

   /* Output from zero filter */

   int32_t m_zeroVal;

   /* Output from overall ARMA filter */

   int32_t m_predVal;

} Predictor_data;

/* Struct required for the Quantisation function of bt-aptX encoder and decoder*/

/* Size of structure: 24 Bytes */

typedef struct

{

   /* Number of bits in the quantised code for this subband */

   int32_t codeBits;

   /* Pointer to threshold table */

   const int32_t* thresholdTablePtr;

   const int32_t* thresholdTablePtr_sl1;

   /* Pointer to dither table */

   const int32_t* ditherTablePtr;

   /* Pointer to minus Lambda table */

   const int32_t* minusLambdaDTable;

   /* Output quantised code */

   int32_t qCode;

   /* Alternative quantised code for sync purposes */

   int32_t altQcode;

   /* Penalty associated with choosing alternative code */

   int32_t distPenalty;

} Quantiser_data;

/* Struct required for the inverse Quantisation function of bt-aptX encoder and decoder*/

/* Size of structure: 32 Bytes */

typedef struct

{

   /* Pointer to threshold table */

   const int32_t* thresholdTablePtr;

   const int32_t* thresholdTablePtr_sl1;

   /* Pointer to dither table */

   const int32_t* ditherTablePtr_sf1;

   /* Pointer to increment table */

   const int32_t* incrTablePtr;

   /* Upper and lower bounds for logDelta */

   int32_t maxLogDelta;

   int32_t minLogDelta;

   /* Delta (quantisation step size */

   int32_t delta;

   /* Delta, expressed as a log base 2 */

   uint16_t logDelta;

   /* Output dequantised signal */

   int32_t invQ;

   /* pointer to IQuant_tableLogT */

   const int32_t* iquantTableLogPtr;

} IQuantiser_data;

/* Subband data structure bt-aptX encoder*/

/* Size of structure: 116+220+32= 368 Bytes */

typedef struct

{

   /* Subband processing consists of inverse quantisation, predictor

    * coefficient update, and predictor filtering. */

   ZeroCoeff_data m_ZeroCoeffData;

   PoleCoeff_data m_PoleCoeffData;

   /* structure holding the data associated with the predictor */

   Predictor_data m_predData;

   /* iqdata holds the data associated with the instance of inverse quantiser */

   IQuantiser_data m_iqdata;

} Subband_data;

/* Encoder data structure bt-aptX encoder*/

/* Size of structure: 368*4+24+4*24 = 1592 Bytes */

typedef struct

{

   /* Subband processing consists of inverse quantisation, predictor

    * coefficient update, and predictor filtering. */

   Subband_data m_SubbandData[4];

   int32_t m_codewordHistory;

   int32_t m_dithSyncRandBit;

   int32_t m_ditherOutputs[4];

   /* structure holding data values for this quantiser */

   Quantiser_data m_qdata[4];

} Encoder_data;

/* Number of predictor pole filter coefficients is fixed at 2 for all subbands */

static const uint32_t numPoleFilterCoeffs = 2;

/* Subband-specific number of predictor zero filter coefficients. */

static const uint32_t numZeroFilterCoeffs[4] = {24, 12, 6, 12};

/* Delta is scaled by 4 positions within the quantiser and inverse quantiser. */

static const uint32_t deltaScale = 4;

#ifdef _GCC

  #pragma GCC visibility pop

#endif

#endif //APTXPARAMETERS_H

/*------------------------------------------------------------------------------

 *

 *  All table definitions used for the quantizer.

 *

 *----------------------------------------------------------------------------*/

#ifndef APTXTABLES_H

#define APTXTABLES_H

#include "AptxParameters.h"

/* Quantisation threshold, logDelta increment and dither tables for 2-bit codes */

static const int32_t dq2bit16_sl1[3] =

{

   -194080,

   194080,

   890562,

};

static const int32_t q2incr16[3] =

{

   0,

   -33,

   136,

};

static const int32_t dq2dith16_sf1[3] =

{

   194080,

   194080,

   502402,

};

static const int32_t dq2mLamb16[2] =

{

   0,

   -77081,

};

/* Quantisation threshold, logDelta increment and dither tables for 3-bit codes */

static const int32_t dq3bit16_sl1[5] =

{

   -163006,

   163006,

   542708,

   1120554,

   2669238,

};

static const int32_t q3incr16[5] =

{

   0,

   -8,

   33,

   95,

   262,

};

static const int32_t dq3dith16_sf1[5] =

{

   163006,

   163006,

   216698,

   361148,

   1187538,

};

static const int32_t dq3mLamb16[4] =

{

   0,

   -13423,

   -36113,

   -206598,

};

/* Quantisation threshold, logDelta increment and dither tables for 4-bit codes */

static const int32_t dq4bit16_sl1[9] =

{

   -89806,

   89806,

   278502,

   494338,

   759442,

   1113112,

   1652322,

   2720256,

   5190186,

};

static const int32_t q4incr16[9] =

{

   0,

   -14,

   6,

   29,

   58,

   96,

   154,

   270,

   521,

};

static const int32_t dq4dith16_sf1[9] =

{

   89806,

   89806,

   98890,

   116946,

   148158,

   205512,

   333698,

   734236,

   1735696,

};

static const int32_t dq4mLamb16[8] =

{

   0,

   -2271,

   -4514,

   -7803,

   -14339,

   -32047,

   -100135,

   -250365,

};

/* Quantisation threshold, logDelta increment and dither tables for 7-bit codes */

static const int32_t dq7bit16_sl1[65] =

{

   -9948,

   9948,

   29860,

   49808,

   69822,

   89926,

   110144,

   130502,

   151026,

   171738,

   192666,

   213832,

   235264,

   256982,

   279014,

   301384,

   324118,

   347244,

   370790,

   394782,

   419250,

   444226,

   469742,

   495832,

   522536,

   549890,

   577936,

   606720,

   636290,

   666700,

   698006,

   730270,

   763562,

   797958,

   833538,

   870398,

   908640,

   948376,

   989740,

   1032874,

   1077948,

   1125150,

   1174700,

   1226850,

   1281900,

   1340196,

   1402156,

   1468282,

   1539182,

   1615610,

   1698514,

   1789098,

   1888944,

   2000168,

   2125700,

   2269750,

   2438670,

   2642660,

   2899462,

   3243240,

   3746078,

   4535138,

   5664098,

   7102424,

   8897462,

};

static const int32_t q7incr16[65] =

{

   0,

   -21,

   -19,

   -17,

   -15,

   -12,

   -10,

   -8,

   -6,

   -4,

   -1,

   1,

   3,

   6,

   8,

   10,

   13,

   15,

   18,

   20,

   23,

   26,

   29,

   31,

   34,

   37,

   40,

   43,

   47,

   50,

   53,

   57,

   60,

   64,

   68,

   72,

   76,

   80,

   85,

   89,

   94,

   99,

   105,

   110,

   116,

   123,

   129,

   136,

   144,

   152,

   161,

   171,

   182,

   194,

   207,

   223,

   241,

   263,

   291,

   328,

   382,

   467,

   522,

   522,

   522,

};

static const int32_t dq7dith16_sf1[65] =

{

   9948,

   9948,

   9962,

   9988,

   10026,

   10078,

   10142,

   10218,

   10306,

   10408,

   10520,

   10646,

   10784,

   10934,

   11098,

   11274,

   11462,

   11664,

   11880,

   12112,

   12358,

   12618,

   12898,

   13194,

   13510,

   13844,

   14202,

   14582,

   14988,

   15422,

   15884,

   16380,

   16912,

   17484,

   18098,

   18762,

   19480,

   20258,

   21106,

   22030,

   23044,

   24158,

   25390,

   26760,

   28290,

   30008,

   31954,

   34172,

   36728,

   39700,

   43202,

   47382,

   52462,

   58762,

   66770,

   77280,

   91642,

   112348,

   144452,

   199326,

   303512,

   485546,

   643414,

   794914,

   1000124,

};

static const int32_t dq7mLamb16[65] =

{

   0,

   -4,

   -7,

   -10,

   -13,

   -16,

   -19,

   -22,

   -26,

   -28,

   -32,

   -35,

   -38,

   -41,

   -44,

   -47,

   -51,

   -54,

   -58,

   -62,

   -65,

   -70,

   -74,

   -79,

   -84,

   -90,

   -95,

   -102,

   -109,

   -116,

   -124,

   -133,

   -143,

   -154,

   -166,

   -180,

   -195,

   -212,

   -231,

   -254,

   -279,

   -308,

   -343,

   -383,

   -430,

   -487,

   -555,

   -639,

   -743,

   -876,

   -1045,

   -1270,

   -1575,

   -2002,

   -2628,

   -3591,

   -5177,

   -8026,

   -13719,

   -26047,

   -45509,

   -39467,

   -37875,

   -51303,

   0,

};

/* Array of structures containing subband parameters. */

static const SubbandParameters subbandParameters[NUMSUBBANDS] =

{

  /* LL band */

  { 0, dq7bit16_sl1, 0, dq7dith16_sf1, dq7mLamb16, q7incr16, 7, (18*256)-1, -20, 24 },

  /* LH band */

  { 0, dq4bit16_sl1, 0, dq4dith16_sf1, dq4mLamb16, q4incr16, 4, (21*256)-1, -23, 12 },

  /* HL band */

  { 0, dq2bit16_sl1, 0, dq2dith16_sf1, dq2mLamb16, q2incr16, 2, (23*256)-1, -25, 6 },

  /* HH band */

  { 0, dq3bit16_sl1, 0, dq3dith16_sf1, dq3mLamb16, q3incr16, 3, (22*256)-1, -24, 12 }

};

#endif //APTXTABLES_H