void ff_h264_init_cabac_states(H264Context *h) {
MpegEncContext * const s = &h->s;
int i;
+ const int8_t (*tab)[2];
+
+ if( h->slice_type_nos == FF_I_TYPE ) tab = cabac_context_init_I;
+ else tab = cabac_context_init_PB[h->cabac_init_idc];
/* calculate pre-state */
for( i= 0; i < 460; i++ ) {
- int pre;
- if( h->slice_type_nos == FF_I_TYPE )
- pre = av_clip( ((cabac_context_init_I[i][0] * s->qscale) >>4 ) + cabac_context_init_I[i][1], 1, 126 );
- else
- pre = av_clip( ((cabac_context_init_PB[h->cabac_init_idc][i][0] * s->qscale) >>4 ) + cabac_context_init_PB[h->cabac_init_idc][i][1], 1, 126 );
+ int pre = 2*(((tab[i][0] * s->qscale) >>4 ) + tab[i][1]) - 127;
- if( pre <= 63 )
- h->cabac_state[i] = 2 * ( 63 - pre ) + 0;
- else
- h->cabac_state[i] = 2 * ( pre - 64 ) + 1;
+ pre^= pre>>31;
+ if(pre > 124)
+ pre= 124 + (pre&1);
+
+ h->cabac_state[i] = pre;
}
}