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CABAC tables and functions

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Marko Viitanen 2012-06-04 13:47:12 +03:00
parent 5dcbe3e8df
commit 92ebb2cd6d
7 changed files with 428 additions and 5 deletions
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5
src/bitstream.c
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@ -1,3 +1,8 @@
/**
* HEVC Encoder
* - Marko Viitanen ( fador at iki.fi ), Tampere University of Technology, Department of Computer Systems.
*/
/*! \file bitstream.c /*! \file bitstream.c
\brief Bitstream related functions \brief Bitstream related functions
\author Marko Viitanen \author Marko Viitanen

4
src/bitstream.h
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@ -14,12 +14,12 @@ typedef struct
uint32_t data[32]; uint32_t data[32];
uint8_t cur_byte; uint8_t cur_byte;
uint8_t cur_bit; uint8_t cur_bit;
FILE* output;
} bitstream; } bitstream;
void bitstream_init(bitstream* stream); void bitstream_init(bitstream* stream);
void bitstream_put(bitstream* stream, uint32_t* data, uint8_t bits); void bitstream_put(bitstream* stream, uint32_t data, uint8_t bits);
void bitstream_align(bitstream* stream); void bitstream_align(bitstream* stream);

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src/cabac.c
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/**
* HEVC Encoder
* - Marko Viitanen ( fador at iki.fi ), Tampere University of Technology, Department of Computer Systems.
*/
/*! \file cabac.c
\brief CABAC
\author Marko Viitanen
\date 2012-06
Content-adaptive binary arithmetic coder
*/
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "global.h"
#include "cabac.h"
#include "bitstream.h"
const uint8_t g_aucNextStateMPS[ 128 ] =
{
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49,
50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65,
66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81,
82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113,
114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 124, 125, 126, 127
};
const uint8_t g_aucNextStateLPS[ 128 ] =
{
1, 0, 0, 1, 2, 3, 4, 5, 4, 5, 8, 9, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 18, 19, 22, 23, 22, 23, 24, 25,
26, 27, 26, 27, 30, 31, 30, 31, 32, 33, 32, 33, 36, 37, 36, 37,
38, 39, 38, 39, 42, 43, 42, 43, 44, 45, 44, 45, 46, 47, 48, 49,
48, 49, 50, 51, 52, 53, 52, 53, 54, 55, 54, 55, 56, 57, 58, 59,
58, 59, 60, 61, 60, 61, 60, 61, 62, 63, 64, 65, 64, 65, 66, 67,
66, 67, 66, 67, 68, 69, 68, 69, 70, 71, 70, 71, 70, 71, 72, 73,
72, 73, 72, 73, 74, 75, 74, 75, 74, 75, 76, 77, 76, 77, 126, 127
};
const uint32_t g_entropyBits[128] =
{
0x07b23, 0x085f9, 0x074a0, 0x08cbc, 0x06ee4, 0x09354, 0x067f4, 0x09c1b, 0x060b0, 0x0a62a, 0x05a9c, 0x0af5b, 0x0548d, 0x0b955, 0x04f56, 0x0c2a9,
0x04a87, 0x0cbf7, 0x045d6, 0x0d5c3, 0x04144, 0x0e01b, 0x03d88, 0x0e937, 0x039e0, 0x0f2cd, 0x03663, 0x0fc9e, 0x03347, 0x10600, 0x03050, 0x10f95,
0x02d4d, 0x11a02, 0x02ad3, 0x12333, 0x0286e, 0x12cad, 0x02604, 0x136df, 0x02425, 0x13f48, 0x021f4, 0x149c4, 0x0203e, 0x1527b, 0x01e4d, 0x15d00,
0x01c99, 0x166de, 0x01b18, 0x17017, 0x019a5, 0x17988, 0x01841, 0x18327, 0x016df, 0x18d50, 0x015d9, 0x19547, 0x0147c, 0x1a083, 0x0138e, 0x1a8a3,
0x01251, 0x1b418, 0x01166, 0x1bd27, 0x01068, 0x1c77b, 0x00f7f, 0x1d18e, 0x00eda, 0x1d91a, 0x00e19, 0x1e254, 0x00d4f, 0x1ec9a, 0x00c90, 0x1f6e0,
0x00c01, 0x1fef8, 0x00b5f, 0x208b1, 0x00ab6, 0x21362, 0x00a15, 0x21e46, 0x00988, 0x2285d, 0x00934, 0x22ea8, 0x008a8, 0x239b2, 0x0081d, 0x24577,
0x007c9, 0x24ce6, 0x00763, 0x25663, 0x00710, 0x25e8f, 0x006a0, 0x26a26, 0x00672, 0x26f23, 0x005e8, 0x27ef8, 0x005ba, 0x284b5, 0x0055e, 0x29057,
0x0050c, 0x29bab, 0x004c1, 0x2a674, 0x004a7, 0x2aa5e, 0x0046f, 0x2b32f, 0x0041f, 0x2c0ad, 0x003e7, 0x2ca8d, 0x003ba, 0x2d323, 0x0010c, 0x3bfbb
};
const uint8_t g_aucLPSTable[64][4] =
{
{ 128, 176, 208, 240}, { 128, 167, 197, 227}, { 128, 158, 187, 216}, { 123, 150, 178, 205}, { 116, 142, 169, 195},
{ 111, 135, 160, 185}, { 105, 128, 152, 175}, { 100, 122, 144, 166}, { 95, 116, 137, 158}, { 90, 110, 130, 150},
{ 85, 104, 123, 142}, { 81, 99, 117, 135}, { 77, 94, 111, 128}, { 73, 89, 105, 122}, { 69, 85, 100, 116},
{ 66, 80, 95, 110}, { 62, 76, 90, 104}, { 59, 72, 86, 99}, { 56, 69, 81, 94}, { 53, 65, 77, 89},
{ 51, 62, 73, 85}, { 48, 59, 69, 80}, { 46, 56, 66, 76}, { 43, 53, 63, 72}, { 41, 50, 59, 69},
{ 39, 48, 56, 65}, { 37, 45, 54, 62}, { 35, 43, 51, 59}, { 33, 41, 48, 56}, { 32, 39, 46, 53},
{ 30, 37, 43, 50}, { 29, 35, 41, 48}, { 27, 33, 39, 45}, { 26, 31, 37, 43}, { 24, 30, 35, 41},
{ 23, 28, 33, 39}, { 22, 27, 32, 37}, { 21, 26, 30, 35}, { 20, 24, 29, 33}, { 19, 23, 27, 31},
{ 18, 22, 26, 30}, { 17, 21, 25, 28}, { 16, 20, 23, 27}, { 15, 19, 22, 25}, { 14, 18, 21, 24},
{ 14, 17, 20, 23}, { 13, 16, 19, 22}, { 12, 15, 18, 21}, { 12, 14, 17, 20}, { 11, 14, 16, 19},
{ 11, 13, 15, 18}, { 10, 12, 15, 17}, { 10, 12, 14, 16}, { 9, 11, 13, 15}, { 9, 11, 12, 14},
{ 8, 10, 12, 14}, { 8, 9, 11, 13}, { 7, 9, 11, 12}, { 7, 9, 10, 12}, { 7, 8, 10, 11},
{ 6, 8, 9, 11}, { 6, 7, 9, 10}, { 6, 7, 8, 9}, { 2, 2, 2, 2}
};
const uint8_t g_aucRenormTable[32] = { 6, 5, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
uint8_t g_nextState[128][2];
cabac_data cabac;
void cxt_init(cabac_ctx* ctx, uint32_t qp, uint32_t initValue )
{
int slope = (initValue>>4)*5 - 45;
int offset = ((initValue&15)<<3)-16;
int initState = MIN( MAX( 1, ( ( ( slope * qp ) >> 4 ) + offset ) ), 126 );
uint8_t mpState = (initState >= 64 )?1:0;
ctx->ucState = ( (mpState? (initState - 64):(63 - initState)) <<1) + mpState;
ctx->binsCoded = 0;
}
void cxt_buildNextStateTable()
{
int i,j;
for (i = 0; i < 128; i++)
{
for (j = 0; j < 2; j++)
{
g_nextState[i][j] = ((i&1) == j) ? g_aucNextStateMPS[i] : g_aucNextStateLPS[i];
}
}
}
void ctx_update(cabac_ctx* ctx, int val ) { ctx->ucState = g_nextState[ctx->ucState][val]; }
void ctx_update_LPS(cabac_ctx* ctx) { ctx->ucState = g_aucNextStateLPS[ ctx->ucState ]; }
void ctx_update_MPS(cabac_ctx* ctx) { ctx->ucState = g_aucNextStateMPS[ ctx->ucState ]; }
void cabac_init(cabac_data* data)
{
data->fracBits = 0;
cxt_buildNextStateTable();
}
void cabac_start(cabac_data* data)
{
data->uiLow = 0;
data->uiRange = 510;
data->bitsLeft = 23;
data->numBufferedBytes = 0;
data->bufferedByte = 0xff;
}
#define CTX_STATE(ctx) (ctx.ucState>>1)
#define CTX_MPS(ctx) (ctx.ucState&1)
void cabac_encodeBin(cabac_data* data, uint32_t binValue )
{
uint32_t uiLPS;
data->uiBinsCoded += data->binCountIncrement;
data->ctx.binsCoded = 1;
uiLPS = g_aucLPSTable[ CTX_STATE(data->ctx) ][ ( data->uiRange >> 6 ) & 3 ];
data->uiRange -= uiLPS;
if( binValue != CTX_MPS(data->ctx) )
{
int numBits = g_aucRenormTable[ uiLPS >> 3 ];
data->uiLow = ( data->uiLow + data->uiRange ) << numBits;
data->uiRange = uiLPS << numBits;
ctx_update_LPS(&data->ctx);
data->bitsLeft -= numBits;
}
else
{
ctx_update_MPS(&data->ctx);
if ( data->uiRange >= 256 )
{
return;
}
data->uiLow <<= 1;
data->uiRange <<= 1;
data->bitsLeft--;
}
if(data->bitsLeft < 12)
{
cabac_write(data);
}
}
void cabac_write(cabac_data* data)
{
uint32_t leadByte = data->uiLow >> (24 - data->bitsLeft);
data->bitsLeft += 8;
data->uiLow &= 0xffffffffu >> data->bitsLeft;
if ( leadByte == 0xff )
{
data->numBufferedBytes++;
}
else
{
if ( data->numBufferedBytes > 0 )
{
uint32_t carry = leadByte >> 8;
uint32_t byte = data->bufferedByte + carry;
data->bufferedByte = leadByte & 0xff;
bitstream_put(data->stream,byte,8);
byte = ( 0xff + carry ) & 0xff;
while ( data->numBufferedBytes > 1 )
{
bitstream_put(data->stream,byte,8);
data->numBufferedBytes--;
}
}
else
{
data->numBufferedBytes = 1;
data->bufferedByte = leadByte;
}
}
}
void cabac_encodeFlush(cabac_data* data, uint8_t end )
{
data->uiRange = 2;
data->uiLow += 2;
data->uiLow <<= 7;
data->uiRange = 2 << 7;
data->bitsLeft -= 7;
if(data->bitsLeft < 12)
{
cabac_write(data);
}
cabac_finish(data);
if(!end)
{
bitstream_put(data->stream,1,1);
}
}
void cabac_finish(cabac_data* data)
{
if ( data->uiLow >> ( 32 - data->bitsLeft ) )
{
bitstream_put(data->stream,data->bufferedByte + 1, 8 );
while ( data->numBufferedBytes > 1 )
{
bitstream_put(data->stream,0, 8 );
data->numBufferedBytes--;
}
data->uiLow -= 1 << ( 32 - data->bitsLeft );
}
else
{
if ( data->numBufferedBytes > 0 )
{
bitstream_put(data->stream,data->bufferedByte, 8 );
}
while ( data->numBufferedBytes > 1 )
{
bitstream_put(data->stream, 0xff, 8 );
data->numBufferedBytes--;
}
}
bitstream_put(data->stream, data->uiLow >> 8, 24 - data->bitsLeft );
}
/**
* \brief Encode terminating bin
*
* \param binValue bin value
*/
void cabac_encodeBinTrm(cabac_data* data, uint32_t binValue )
{
data->uiBinsCoded += data->binCountIncrement;
data->uiRange -= 2;
if( binValue )
{
data->uiLow += data->uiRange;
data->uiLow <<= 7;
data->uiRange = 2 << 7;
data->bitsLeft -= 7;
}
else if ( data->uiRange >= 256 )
{
return;
}
else
{
data->uiLow <<= 1;
data->uiRange <<= 1;
data->bitsLeft--;
}
if(data->bitsLeft < 12)
{
cabac_write(data);
}
}
void cabac_flush(cabac_data* data)
{
cabac_encodeBinTrm(data,1);
cabac_finish(data);
bitstream_put(data->stream,1,1);
cabac_start(data);
}
void cabac_encodeBinEP(cabac_data* data, uint32_t binValue )
{
data->uiBinsCoded += data->binCountIncrement;
data->uiLow <<= 1;
if( binValue )
{
data->uiLow += data->uiRange;
}
data->bitsLeft--;
if(data->bitsLeft < 12)
{
cabac_write(data);
}
}
void cabac_encodeBinsEP(cabac_data* data, uint32_t binValues, int numBins )
{
uint32_t pattern;
data->uiBinsCoded += numBins & -data->binCountIncrement;
while ( numBins > 8 )
{
numBins -= 8;
pattern = binValues >> numBins;
data->uiLow <<= 8;
data->uiLow += data->uiRange * pattern;
binValues -= pattern << numBins;
data->bitsLeft -= 8;
if(data->bitsLeft < 12)
{
cabac_write(data);
}
}
data->uiLow <<= numBins;
data->uiLow += data->uiRange * binValues;
data->bitsLeft -= numBins;
if(data->bitsLeft < 12)
{
cabac_write(data);
}
}

66
src/cabac.h
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/**
* HEVC Encoder
* - Marko Viitanen ( fador at iki.fi ), Tampere University of Technology, Department of Computer Systems.
*/
/*! \file cabac.h
\brief CABAC
\author Marko Viitanen
\date 2012-06
Content-adaptive binary arithmetic coder
*/
#ifndef __CABAC_H
#define __CABAC_H
#include "bitstream.h"
extern const uint8_t g_aucNextStateMPS[ 128 ];
extern const uint8_t g_aucNextStateLPS[ 128 ];
extern const uint32_t g_entropyBits[128];
extern uint8_t g_nextState[128][2];
extern const uint8_t g_aucLPSTable[64][4];
extern const uint8_t g_aucRenormTable[32];
typedef struct
{
uint8_t ucState;
uint32_t binsCoded;
} cabac_ctx;
void cxt_init(cabac_ctx* ctx,uint32_t qp, uint32_t initValue );
void cxt_buildNextStateTable();
void ctx_update(cabac_ctx* ctx, int val );
void ctx_update_LPS(cabac_ctx* ctx);
void ctx_update_MPS(cabac_ctx* ctx);
typedef struct
{
cabac_ctx ctx;
uint32_t uiLow;
uint32_t uiRange;
uint32_t bufferedByte;
int32_t numBufferedBytes;
int32_t bitsLeft;
uint32_t uiBinsCoded;
int32_t binCountIncrement;
uint64_t fracBits;
bitstream* stream;
} cabac_data;
extern cabac_data cabac;
void cabac_init(cabac_data* data);
void cabac_encodeBin(cabac_data* data, uint32_t binValue );
void cabac_encodeFlush(cabac_data* data, uint8_t end );
void cabac_encodeBinEP(cabac_data* data, uint32_t binValue );
void cabac_encodeBinsEP(cabac_data* data, uint32_t binValues, int numBins );
void cabac_write(cabac_data* data);
void cabac_finish(cabac_data* data);
void cabac_flush(cabac_data* data);
#endif

10
src/encmain.c
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@ -41,6 +41,7 @@
#include "global.h" #include "global.h"
#include "config.h" #include "config.h"
#include "encoder.h" #include "encoder.h"
#include "cabac.h"
/*! /*!
@ -55,7 +56,7 @@
config *cfg = NULL; /* Global configuration */ config *cfg = NULL; /* Global configuration */
FILE *input = NULL; FILE *input = NULL;
FILE *output = NULL; FILE *output = NULL;
encoder_control* encoder; encoder_control* encoder = (encoder_control*)malloc(sizeof(encoder_control));;
/* Handle configuration */ /* Handle configuration */
cfg = config_alloc(); cfg = config_alloc();
@ -99,6 +100,13 @@
return EXIT_FAILURE; return EXIT_FAILURE;
} }
/* Initialization */
cabac_init(&cabac);
//ToDo: add bitstream
//cabac.stream =
init_encoder_control(encoder, output);
init_encoder_input(&encoder->in, input, 320, 240);
fclose(input); fclose(input);
fclose(output); fclose(output);

10
src/encoder.h
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@ -1,3 +1,8 @@
/**
* HEVC Encoder
* - Marko Viitanen ( fador at iki.fi ), Tampere University of Technology, Department of Computer Systems.
*/
/*! \file encoder.h /*! \file encoder.h
\brief Encoding related functions \brief Encoding related functions
\author Marko Viitanen \author Marko Viitanen
@ -8,10 +13,13 @@
#ifndef _ENCODER_H #ifndef _ENCODER_H
#define _ENCODER_H #define _ENCODER_H
typedef struct encoder_control;
//ToDo: add ME data //ToDo: add ME data
typedef struct typedef struct
{ {
void (*IME)(encoder_control* encoder); //void (*IME)(encoder_control* encoder);
int range;
} encoder_me; } encoder_me;

3
src/global.h
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@ -20,6 +20,9 @@
#include <stdint.h> #include <stdint.h>
#endif #endif
#define MAX(a,b) (((a)<(b))?(b):(a))
#define MIN(a,b) (((a)>(b))?(b):(a))
#define VERSION_STRING "0.1 " #define VERSION_STRING "0.1 "
#define VERSION 0.1 #define VERSION 0.1