#ifndef AVCODEC_CABAC_H
#define AVCODEC_CABAC_H
-#include <stddef.h>
+#include <stdint.h>
#include "put_bits.h"
-//#undef NDEBUG
-#include <assert.h>
+extern uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63];
+#define H264_NORM_SHIFT_OFFSET 0
+#define H264_LPS_RANGE_OFFSET 512
+#define H264_MLPS_STATE_OFFSET 1024
+#define H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET 1280
#define CABAC_BITS 16
#define CABAC_MASK ((1<<CABAC_BITS)-1)
typedef struct CABACContext{
int low;
int range;
- int outstanding_count;
-#ifdef STRICT_LIMITS
- int symCount;
-#endif
const uint8_t *bytestream_start;
const uint8_t *bytestream;
const uint8_t *bytestream_end;
- PutBitContext pb;
}CABACContext;
-extern uint8_t ff_h264_mlps_state[4*64];
-extern uint8_t ff_h264_lps_range[4*2*64]; ///< rangeTabLPS
-extern uint8_t ff_h264_mps_state[2*64]; ///< transIdxMPS
-extern uint8_t ff_h264_lps_state[2*64]; ///< transIdxLPS
-extern const uint8_t ff_h264_norm_shift[512];
-
-#if ARCH_X86
-# include "x86/cabac.h"
-#endif
-
-void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size);
void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size);
-void ff_init_cabac_states(CABACContext *c);
-
-
-static inline void put_cabac_bit(CABACContext *c, int b){
- put_bits(&c->pb, 1, b);
- for(;c->outstanding_count; c->outstanding_count--){
- put_bits(&c->pb, 1, 1-b);
- }
-}
-
-static inline void renorm_cabac_encoder(CABACContext *c){
- while(c->range < 0x100){
- //FIXME optimize
- if(c->low<0x100){
- put_cabac_bit(c, 0);
- }else if(c->low<0x200){
- c->outstanding_count++;
- c->low -= 0x100;
- }else{
- put_cabac_bit(c, 1);
- c->low -= 0x200;
- }
-
- c->range+= c->range;
- c->low += c->low;
- }
-}
-
-static void refill(CABACContext *c){
-#if CABAC_BITS == 16
- c->low+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1);
-#else
- c->low+= c->bytestream[0]<<1;
-#endif
- c->low -= CABAC_MASK;
- c->bytestream+= CABAC_BITS/8;
-}
-
-static inline void renorm_cabac_decoder(CABACContext *c){
- while(c->range < 0x100){
- c->range+= c->range;
- c->low+= c->low;
- if(!(c->low & CABAC_MASK))
- refill(c);
- }
-}
-
-static inline void renorm_cabac_decoder_once(CABACContext *c){
- int shift= (uint32_t)(c->range - 0x100)>>31;
- c->range<<= shift;
- c->low <<= shift;
- if(!(c->low & CABAC_MASK))
- refill(c);
-}
-
-#ifndef get_cabac_inline
-static void refill2(CABACContext *c){
- int i, x;
-
- x= c->low ^ (c->low-1);
- i= 7 - ff_h264_norm_shift[x>>(CABAC_BITS-1)];
-
- x= -CABAC_MASK;
-
-#if CABAC_BITS == 16
- x+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1);
-#else
- x+= c->bytestream[0]<<1;
-#endif
-
- c->low += x<<i;
- c->bytestream+= CABAC_BITS/8;
-}
-
-static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const state){
- int s = *state;
- int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + s];
- int bit, lps_mask;
-
- c->range -= RangeLPS;
- lps_mask= ((c->range<<(CABAC_BITS+1)) - c->low)>>31;
-
- c->low -= (c->range<<(CABAC_BITS+1)) & lps_mask;
- c->range += (RangeLPS - c->range) & lps_mask;
-
- s^=lps_mask;
- *state= (ff_h264_mlps_state+128)[s];
- bit= s&1;
-
- lps_mask= ff_h264_norm_shift[c->range];
- c->range<<= lps_mask;
- c->low <<= lps_mask;
- if(!(c->low & CABAC_MASK))
- refill2(c);
- return bit;
-}
-#endif
-
-static int av_noinline av_unused get_cabac_noinline(CABACContext *c, uint8_t * const state){
- return get_cabac_inline(c,state);
-}
-
-static int av_unused get_cabac(CABACContext *c, uint8_t * const state){
- return get_cabac_inline(c,state);
-}
-
-static int av_unused get_cabac_bypass(CABACContext *c){
- int range;
- c->low += c->low;
-
- if(!(c->low & CABAC_MASK))
- refill(c);
-
- range= c->range<<(CABAC_BITS+1);
- if(c->low < range){
- return 0;
- }else{
- c->low -= range;
- return 1;
- }
-}
-
-
-#ifndef get_cabac_bypass_sign
-static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){
- int range, mask;
- c->low += c->low;
-
- if(!(c->low & CABAC_MASK))
- refill(c);
-
- range= c->range<<(CABAC_BITS+1);
- c->low -= range;
- mask= c->low >> 31;
- range &= mask;
- c->low += range;
- return (val^mask)-mask;
-}
-#endif
-
-/**
- *
- * @return the number of bytes read or 0 if no end
- */
-static int av_unused get_cabac_terminate(CABACContext *c){
- c->range -= 2;
- if(c->low < c->range<<(CABAC_BITS+1)){
- renorm_cabac_decoder_once(c);
- return 0;
- }else{
- return c->bytestream - c->bytestream_start;
- }
-}
-
-#if 0
-/**
- * Get (truncated) unary binarization.
- */
-static int get_cabac_u(CABACContext *c, uint8_t * state, int max, int max_index, int truncated){
- int i;
-
- for(i=0; i<max; i++){
- if(get_cabac(c, state)==0)
- return i;
-
- if(i< max_index) state++;
- }
-
- return truncated ? max : -1;
-}
-
-/**
- * get unary exp golomb k-th order binarization.
- */
-static int get_cabac_ueg(CABACContext *c, uint8_t * state, int max, int is_signed, int k, int max_index){
- int i, v;
- int m= 1<<k;
-
- if(get_cabac(c, state)==0)
- return 0;
-
- if(0 < max_index) state++;
-
- for(i=1; i<max; i++){
- if(get_cabac(c, state)==0){
- if(is_signed && get_cabac_bypass(c)){
- return -i;
- }else
- return i;
- }
-
- if(i < max_index) state++;
- }
-
- while(get_cabac_bypass(c)){
- i+= m;
- m+= m;
- }
-
- v=0;
- while(m>>=1){
- v+= v + get_cabac_bypass(c);
- }
- i += v;
-
- if(is_signed && get_cabac_bypass(c)){
- return -i;
- }else
- return i;
-}
-#endif /* 0 */
+void ff_init_cabac_states(void);
#endif /* AVCODEC_CABAC_H */
projects / ffmpeg / blobdiff