#include "opustab.h"
#include "opus_pvq.h"
+/* Use the 2D z-transform to apply prediction in both the time domain (alpha)
+ * and the frequency domain (beta) */
static void celt_decode_coarse_energy(CeltFrame *f, OpusRangeCoder *rc)
{
int i, j;
- float prev[2] = {0};
- float alpha, beta;
- const uint8_t *model;
-
- /* use the 2D z-transform to apply prediction in both */
- /* the time domain (alpha) and the frequency domain (beta) */
-
- if (opus_rc_tell(rc)+3 <= f->framebits && ff_opus_rc_dec_log(rc, 3)) {
- /* intra frame */
- alpha = 0;
- beta = 1.0f - 4915.0f/32768.0f;
+ float prev[2] = { 0 };
+ float alpha = ff_celt_alpha_coef[f->size];
+ float beta = ff_celt_beta_coef[f->size];
+ const uint8_t *model = ff_celt_coarse_energy_dist[f->size][0];
+
+ /* intra frame */
+ if (opus_rc_tell(rc) + 3 <= f->framebits && ff_opus_rc_dec_log(rc, 3)) {
+ alpha = 0.0f;
+ beta = 1.0f - (4915.0f/32768.0f);
model = ff_celt_coarse_energy_dist[f->size][1];
- } else {
- alpha = ff_celt_alpha_coef[f->size];
- beta = 1.0f - ff_celt_beta_coef[f->size];
- model = ff_celt_coarse_energy_dist[f->size][0];
}
for (i = 0; i < CELT_MAX_BANDS; i++) {
if (intra) {
alpha = 0.0f;
- beta = 1.0f - 4915.0f/32768.0f;
+ beta = 1.0f - (4915.0f/32768.0f);
} else {
alpha = ff_celt_alpha_coef[f->size];
- beta = 1.0f - ff_celt_beta_coef[f->size];
+ beta = ff_celt_beta_coef[f->size];
}
for (i = f->start_band; i < f->end_band; i++) {
29440.0f/32768.0f, 26112.0f/32768.0f, 21248.0f/32768.0f, 16384.0f/32768.0f
};
-const float ff_celt_beta_coef[] = { /* TODO: precompute 1 minus this if the code ends up neater */
- 30147.0f/32768.0f, 22282.0f/32768.0f, 12124.0f/32768.0f, 6554.0f/32768.0f
+const float ff_celt_beta_coef[] = {
+ 1.0f - (30147.0f/32768.0f), 1.0f - (22282.0f/32768.0f), 1.0f - (12124.0f/32768.0f), 1.0f - (6554.0f/32768.0f),
};
const uint8_t ff_celt_coarse_energy_dist[4][2][42] = {