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@ -162,150 +162,3 @@ void ff_init_cabac_states(CABACContext *c){ |
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ff_h264_last_coeff_flag_offset_8x8[i] = last_coeff_flag_offset_8x8[i]; |
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} |
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} |
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#ifdef TEST |
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#define SIZE 10240 |
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#include "libavutil/lfg.h" |
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#include "avcodec.h" |
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#include "cabac.h" |
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static inline void put_cabac_bit(CABACContext *c, int b){ |
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put_bits(&c->pb, 1, b); |
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for(;c->outstanding_count; c->outstanding_count--){ |
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put_bits(&c->pb, 1, 1-b); |
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} |
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} |
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static inline void renorm_cabac_encoder(CABACContext *c){ |
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while(c->range < 0x100){ |
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//FIXME optimize
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if(c->low<0x100){ |
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put_cabac_bit(c, 0); |
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}else if(c->low<0x200){ |
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c->outstanding_count++; |
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c->low -= 0x100; |
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}else{ |
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put_cabac_bit(c, 1); |
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c->low -= 0x200; |
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} |
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c->range+= c->range; |
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c->low += c->low; |
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} |
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} |
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static void put_cabac(CABACContext *c, uint8_t * const state, int bit){ |
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int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + *state]; |
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if(bit == ((*state)&1)){ |
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c->range -= RangeLPS; |
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*state = h264_mps_state[*state]; |
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}else{ |
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c->low += c->range - RangeLPS; |
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c->range = RangeLPS; |
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} |
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renorm_cabac_encoder(c); |
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} |
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/**
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* @param bit 0 -> write zero bit, !=0 write one bit |
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*/ |
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static void put_cabac_bypass(CABACContext *c, int bit){ |
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c->low += c->low; |
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if(bit){ |
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c->low += c->range; |
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} |
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//FIXME optimize
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if(c->low<0x200){ |
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put_cabac_bit(c, 0); |
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}else if(c->low<0x400){ |
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c->outstanding_count++; |
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c->low -= 0x200; |
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}else{ |
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put_cabac_bit(c, 1); |
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c->low -= 0x400; |
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} |
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} |
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/**
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* |
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* @return the number of bytes written |
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*/ |
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static int put_cabac_terminate(CABACContext *c, int bit){ |
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c->range -= 2; |
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if(!bit){ |
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renorm_cabac_encoder(c); |
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}else{ |
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c->low += c->range; |
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c->range= 2; |
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renorm_cabac_encoder(c); |
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assert(c->low <= 0x1FF); |
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put_cabac_bit(c, c->low>>9); |
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put_bits(&c->pb, 2, ((c->low>>7)&3)|1); |
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flush_put_bits(&c->pb); //FIXME FIXME FIXME XXX wrong
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} |
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return (put_bits_count(&c->pb)+7)>>3; |
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} |
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int main(void){ |
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CABACContext c; |
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uint8_t b[9*SIZE]; |
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uint8_t r[9*SIZE]; |
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int i; |
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uint8_t state[10]= {0}; |
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AVLFG prng; |
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av_lfg_init(&prng, 1); |
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ff_init_cabac_encoder(&c, b, SIZE); |
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ff_init_cabac_states(&c); |
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for(i=0; i<SIZE; i++){ |
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r[i] = av_lfg_get(&prng) % 7; |
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} |
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for(i=0; i<SIZE; i++){ |
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START_TIMER |
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put_cabac_bypass(&c, r[i]&1); |
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STOP_TIMER("put_cabac_bypass") |
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} |
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for(i=0; i<SIZE; i++){ |
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START_TIMER |
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put_cabac(&c, state, r[i]&1); |
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STOP_TIMER("put_cabac") |
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} |
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put_cabac_terminate(&c, 1); |
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ff_init_cabac_decoder(&c, b, SIZE); |
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memset(state, 0, sizeof(state)); |
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for(i=0; i<SIZE; i++){ |
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START_TIMER |
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if( (r[i]&1) != get_cabac_bypass(&c) ) |
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av_log(NULL, AV_LOG_ERROR, "CABAC bypass failure at %d\n", i); |
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STOP_TIMER("get_cabac_bypass") |
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} |
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for(i=0; i<SIZE; i++){ |
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START_TIMER |
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if( (r[i]&1) != get_cabac(&c, state) ) |
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av_log(NULL, AV_LOG_ERROR, "CABAC failure at %d\n", i); |
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STOP_TIMER("get_cabac") |
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} |
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if(!get_cabac_terminate(&c)) |
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av_log(NULL, AV_LOG_ERROR, "where's the Terminator?\n"); |
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return 0; |
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} |
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#endif /* TEST */ |
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