static void vp5_parse_coeff(VP56Context *s) { VP56RangeCoder *c = &s->c; VP56Model *model = s->modelp; uint8_t *permute = s->idct_scantable; uint8_t *model1, *model2; int coeff, sign, coeff_idx; int b, i, cg, idx, ctx, ctx_last; int pt = 0; /* plane type (0 for Y, 1 for U or V) */ for (b=0; b<6; b++) { int ct = 1; /* code type */ if (b > 3) pt = 1; ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0] + s->above_blocks[s->above_block_idx[b]].not_null_dc; model1 = model->coeff_dccv[pt]; model2 = model->coeff_dcct[pt][ctx]; coeff_idx = 0; for (;;) { if (vp56_rac_get_prob_branchy(c, model2[0])) { if (vp56_rac_get_prob_branchy(c, model2[2])) { if (vp56_rac_get_prob_branchy(c, model2[3])) { s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4; idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1); sign = vp56_rac_get(c); coeff = ff_vp56_coeff_bias[idx+5]; for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--) coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i; } else { if (vp56_rac_get_prob_branchy(c, model2[4])) { coeff = 3 + vp56_rac_get_prob(c, model1[5]); s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3; } else { coeff = 2; s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2; } sign = vp56_rac_get(c); } ct = 2; } else { ct = 1; s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1; sign = vp56_rac_get(c); coeff = 1; } coeff = (coeff ^ -sign) + sign; if (coeff_idx) coeff *= s->dequant_ac; s->block_coeff[b][permute[coeff_idx]] = coeff; } else { if (ct && !vp56_rac_get_prob_branchy(c, model2[1])) break; ct = 0; s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0; } coeff_idx++; if (coeff_idx >= 64) break; cg = vp5_coeff_groups[coeff_idx]; ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx]; model1 = model->coeff_ract[pt][ct][cg]; model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx]; } ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24); s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx; if (coeff_idx < ctx_last) for (i=coeff_idx; i<=ctx_last; i++) s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5; s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0]; } }
static void vp5_parse_coeff(VP56Context *s) { VP56RangeCoder *c = &s->c; VP56Model *model = s->modelp; uint8_t *permute = s->idct_scantable; uint8_t *model1, *model2; int coeff, sign, coeff_idx; int b, i, cg, idx, ctx, ctx_last; int pt = 0;   for (b=0; b<6; b++) { int ct = 1;   if (b > 3) pt = 1; ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0] + s->above_blocks[s->above_block_idx[b]].not_null_dc; model1 = model->coeff_dccv[pt]; model2 = model->coeff_dcct[pt][ctx]; coeff_idx = 0; for (;;) { if (vp56_rac_get_prob_branchy(c, model2[0])) { if (vp56_rac_get_prob_branchy(c, model2[2])) { if (vp56_rac_get_prob_branchy(c, model2[3])) { s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4; idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1); sign = vp56_rac_get(c); coeff = ff_vp56_coeff_bias[idx+5]; for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--) coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i; } else { if (vp56_rac_get_prob_branchy(c, model2[4])) { coeff = 3 + vp56_rac_get_prob(c, model1[5]); s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3; } else { coeff = 2; s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2; } sign = vp56_rac_get(c); } ct = 2; } else { ct = 1; s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1; sign = vp56_rac_get(c); coeff = 1; } coeff = (coeff ^ -sign) + sign; if (coeff_idx) coeff *= s->dequant_ac; s->block_coeff[b][permute[coeff_idx]] = coeff; } else { if (ct && !vp56_rac_get_prob_branchy(c, model2[1])) break; ct = 0; s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0; } coeff_idx++; if (coeff_idx >= 64) break; cg = vp5_coeff_groups[coeff_idx]; ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx]; model1 = model->coeff_ract[pt][ct][cg]; model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx]; } ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24); s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx; if (coeff_idx < ctx_last) for (i=coeff_idx; i<=ctx_last; i++) s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5; s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0]; } }