Commit eefe8692 authored by Jingning Han's avatar Jingning Han
Browse files

Simplify rate-distortion modeling function

Use left shift to replace one multiplication. The computation
outcome remains identical.

Change-Id: I1e1737af0a245de0d2a2bde10f0c171477199fc1
parent 91471d6a
......@@ -249,14 +249,14 @@ static void model_rd_for_sb_y(VP9_COMP *cpi, BLOCK_SIZE bsize,
#if CONFIG_VP9_HIGHBITDEPTH
if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
vp9_model_rd_from_var_lapndz(sse - var, 1 << num_pels_log2_lookup[bsize],
vp9_model_rd_from_var_lapndz(sse - var, num_pels_log2_lookup[bsize],
dc_quant >> (xd->bd - 5), &rate, &dist);
} else {
vp9_model_rd_from_var_lapndz(sse - var, 1 << num_pels_log2_lookup[bsize],
vp9_model_rd_from_var_lapndz(sse - var, num_pels_log2_lookup[bsize],
dc_quant >> 3, &rate, &dist);
}
#else
vp9_model_rd_from_var_lapndz(sse - var, 1 << num_pels_log2_lookup[bsize],
vp9_model_rd_from_var_lapndz(sse - var, num_pels_log2_lookup[bsize],
dc_quant >> 3, &rate, &dist);
#endif // CONFIG_VP9_HIGHBITDEPTH
......@@ -265,14 +265,14 @@ static void model_rd_for_sb_y(VP9_COMP *cpi, BLOCK_SIZE bsize,
#if CONFIG_VP9_HIGHBITDEPTH
if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
vp9_model_rd_from_var_lapndz(var, 1 << num_pels_log2_lookup[bsize],
vp9_model_rd_from_var_lapndz(var, num_pels_log2_lookup[bsize],
ac_quant >> (xd->bd - 5), &rate, &dist);
} else {
vp9_model_rd_from_var_lapndz(var, 1 << num_pels_log2_lookup[bsize],
vp9_model_rd_from_var_lapndz(var, num_pels_log2_lookup[bsize],
ac_quant >> 3, &rate, &dist);
}
#else
vp9_model_rd_from_var_lapndz(var, 1 << num_pels_log2_lookup[bsize],
vp9_model_rd_from_var_lapndz(var, num_pels_log2_lookup[bsize],
ac_quant >> 3, &rate, &dist);
#endif // CONFIG_VP9_HIGHBITDEPTH
......
......@@ -379,7 +379,7 @@ static void model_rd_norm(int xsq_q10, int *r_q10, int *d_q10) {
*d_q10 = (dist_tab_q10[xq] * b_q10 + dist_tab_q10[xq + 1] * a_q10) >> 10;
}
void vp9_model_rd_from_var_lapndz(unsigned int var, unsigned int n,
void vp9_model_rd_from_var_lapndz(unsigned int var, unsigned int n_log2,
unsigned int qstep, int *rate,
int64_t *dist) {
// This function models the rate and distortion for a Laplacian
......@@ -395,10 +395,10 @@ void vp9_model_rd_from_var_lapndz(unsigned int var, unsigned int n,
int d_q10, r_q10;
static const uint32_t MAX_XSQ_Q10 = 245727;
const uint64_t xsq_q10_64 =
((((uint64_t)qstep * qstep * n) << 10) + (var >> 1)) / var;
(((uint64_t)qstep * qstep << (n_log2 + 10)) + (var >> 1)) / var;
const int xsq_q10 = (int)MIN(xsq_q10_64, MAX_XSQ_Q10);
model_rd_norm(xsq_q10, &r_q10, &d_q10);
*rate = (n * r_q10 + 2) >> 2;
*rate = ((r_q10 << n_log2) + 2) >> 2;
*dist = (var * (int64_t)d_q10 + 512) >> 10;
}
}
......
......@@ -265,15 +265,15 @@ static void model_rd_for_sb(VP9_COMP *cpi, BLOCK_SIZE bsize,
} else {
#if CONFIG_VP9_HIGHBITDEPTH
if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
vp9_model_rd_from_var_lapndz(sum_sse, 1 << num_pels_log2_lookup[bs],
vp9_model_rd_from_var_lapndz(sum_sse, num_pels_log2_lookup[bs],
pd->dequant[1] >> (xd->bd - 5),
&rate, &dist);
} else {
vp9_model_rd_from_var_lapndz(sum_sse, 1 << num_pels_log2_lookup[bs],
vp9_model_rd_from_var_lapndz(sum_sse, num_pels_log2_lookup[bs],
pd->dequant[1] >> 3, &rate, &dist);
}
#else
vp9_model_rd_from_var_lapndz(sum_sse, 1 << num_pels_log2_lookup[bs],
vp9_model_rd_from_var_lapndz(sum_sse, num_pels_log2_lookup[bs],
pd->dequant[1] >> 3, &rate, &dist);
#endif // CONFIG_VP9_HIGHBITDEPTH
rate_sum += rate;
......
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