static void od_decode_pvq_codeword(od_ec_dec *ec, od_pvq_codeword_ctx *ctx,
od_coeff *y, int n, int k, int noref, int bs) {
if (k == 1 && n < 16) {
int cdf_id;
int pos;
cdf_id = 2*(n == 15) + !noref;
OD_CLEAR(y, n);
pos = od_decode_cdf_adapt(ec, ctx->pvq_k1_cdf[cdf_id], n - !noref,
ctx->pvq_k1_increment, "pvq:k1");
y[pos] = 1;
if (od_ec_dec_bits(ec, 1, "pvq:k1")) y[pos] = -y[pos];
}
else {
int speed = 5;
int *pvq_adapt;
int adapt_curr[OD_NSB_ADAPT_CTXS] = { 0 };
pvq_adapt = ctx->pvq_adapt + 4*(2*bs + noref);
laplace_decode_vector(ec, y, n - !noref, k, adapt_curr,
pvq_adapt, "pvq:ktok");
if (adapt_curr[OD_ADAPT_K_Q8] > 0) {
pvq_adapt[OD_ADAPT_K_Q8] += (256*adapt_curr[OD_ADAPT_K_Q8]
- pvq_adapt[OD_ADAPT_K_Q8]) >> speed;
pvq_adapt[OD_ADAPT_SUM_EX_Q8] += (adapt_curr[OD_ADAPT_SUM_EX_Q8]
- pvq_adapt[OD_ADAPT_SUM_EX_Q8]) >> speed;
}
if (adapt_curr[OD_ADAPT_COUNT_Q8] > 0) {
pvq_adapt[OD_ADAPT_COUNT_Q8] += (adapt_curr[OD_ADAPT_COUNT_Q8]
- pvq_adapt[OD_ADAPT_COUNT_Q8]) >> speed;
pvq_adapt[OD_ADAPT_COUNT_EX_Q8] += (adapt_curr[OD_ADAPT_COUNT_EX_Q8]
- pvq_adapt[OD_ADAPT_COUNT_EX_Q8]) >> speed;
}
static void od_decode_mv(daala_dec_ctx *dec, od_mv_grid_pt *mvg, int vx,
int vy, int level, int mv_res, int width, int height) {
generic_encoder *model;
int pred[2];
int ox;
int oy;
int id;
int equal_mvs;
equal_mvs = od_state_get_predictor(&dec->state, pred, vx, vy, level, mv_res);
model = &dec->state.adapt.mv_model;
id = od_decode_cdf_adapt(&dec->ec, dec->state.adapt.mv_small_cdf[equal_mvs],
16, dec->state.adapt.mv_small_increment);
oy = id >> 2;
ox = id & 0x3;
if (ox == 3) {
ox += generic_decode(&dec->ec, model, width << (3 - mv_res),
&dec->state.adapt.mv_ex[level], 6);
}
if (oy == 3) {
oy += generic_decode(&dec->ec, model, height << (3 - mv_res),
&dec->state.adapt.mv_ey[level], 6);
}
if (ox && od_ec_dec_bits(&dec->ec, 1)) ox = -ox;
if (oy && od_ec_dec_bits(&dec->ec, 1)) oy = -oy;
mvg->mv[0] = (pred[0] + ox) << mv_res;
mvg->mv[1] = (pred[1] + oy) << mv_res;
}
