int bands = 0;
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
- for (g = 0; g < sce->ics.num_swb; g++) {
+ for (g = 0; g < sce->ics.num_swb; g++) {
if (sce->zeroes[w*16+g])
continue;
if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
/* Clip the scalefactor indices */
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
- for (g = 0; g < sce->ics.num_swb; g++) {
+ for (g = 0; g < sce->ics.num_swb; g++) {
if (sce->zeroes[w*16+g])
continue;
if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
}
//set the same quantizers inside window groups
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
- for (g = 0; g < sce->ics.num_swb; g++)
+ for (g = 0; g < sce->ics.num_swb; g++)
for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
}
SingleChannelElement *sce,
const float lambda)
{
- int i, w, w2, g;
- int minq = 255;
-
- memset(sce->sf_idx, 0, sizeof(sce->sf_idx));
+ int start = 0, i, w, w2, g;
+ int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels * (lambda / 120.f);
+ float dists[128] = { 0 }, uplims[128] = { 0 };
+ float maxvals[128];
+ int fflag, minscaler;
+ int its = 0;
+ int allz = 0;
+ float minthr = INFINITY;
+
+ // for values above this the decoder might end up in an endless loop
+ // due to always having more bits than what can be encoded.
+ destbits = FFMIN(destbits, 5800);
+ //some heuristic to determine initial quantizers will reduce search time
+ //determine zero bands and upper limits
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
+ start = 0;
for (g = 0; g < sce->ics.num_swb; g++) {
+ int nz = 0;
+ float uplim = 0.0f, energy = 0.0f;
for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];
- if (band->energy <= band->threshold) {
- sce->sf_idx[(w+w2)*16+g] = 218;
+ uplim += band->threshold;
+ energy += band->energy;
+ if (band->energy <= band->threshold || band->threshold == 0.0f) {
sce->zeroes[(w+w2)*16+g] = 1;
- } else {
- sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218);
- sce->zeroes[(w+w2)*16+g] = 0;
+ continue;
}
- minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]);
+ nz = 1;
}
+ uplims[w*16+g] = uplim *512;
+ sce->band_type[w*16+g] = 0;
+ sce->zeroes[w*16+g] = !nz;
+ if (nz)
+ minthr = FFMIN(minthr, uplim);
+ allz |= nz;
+ start += sce->ics.swb_sizes[g];
}
}
- for (i = 0; i < 128; i++) {
- sce->sf_idx[i] = 140;
- //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1);
+ for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
+ for (g = 0; g < sce->ics.num_swb; g++) {
+ if (sce->zeroes[w*16+g]) {
+ sce->sf_idx[w*16+g] = SCALE_ONE_POS;
+ continue;
+ }
+ sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59);
+ }
}
- //set the same quantizers inside window groups
- for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
- for (g = 0; g < sce->ics.num_swb; g++)
- for (w2 = 1; w2 < sce->ics.group_len[w]; w2++)
- sce->sf_idx[(w+w2)*16+g] = sce->sf_idx[w*16+g];
+
+ if (!allz)
+ return;
+ abs_pow34_v(s->scoefs, sce->coeffs, 1024);
+ ff_quantize_band_cost_cache_init(s);
+
+ for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
+ start = w*128;
+ for (g = 0; g < sce->ics.num_swb; g++) {
+ const float *scaled = s->scoefs + start;
+ maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled);
+ start += sce->ics.swb_sizes[g];
+ }
+ }
+
+ //perform two-loop search
+ //outer loop - improve quality
+ do {
+ int tbits, qstep;
+ minscaler = sce->sf_idx[0];
+ //inner loop - quantize spectrum to fit into given number of bits
+ qstep = its ? 1 : 32;
+ do {
+ int prev = -1;
+ tbits = 0;
+ for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
+ start = w*128;
+ for (g = 0; g < sce->ics.num_swb; g++) {
+ const float *coefs = sce->coeffs + start;
+ const float *scaled = s->scoefs + start;
+ int bits = 0;
+ int cb;
+ float dist = 0.0f;
+
+ if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) {
+ start += sce->ics.swb_sizes[g];
+ continue;
+ }
+ minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]);
+ cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
+ for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {
+ int b;
+ dist += quantize_band_cost_cached(s, w + w2, g,
+ coefs + w2*128,
+ scaled + w2*128,
+ sce->ics.swb_sizes[g],
+ sce->sf_idx[w*16+g],
+ cb, 1.0f, INFINITY,
+ &b, NULL, 0);
+ bits += b;
+ }
+ dists[w*16+g] = dist - bits;
+ if (prev != -1) {
+ bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
+ }
+ tbits += bits;
+ start += sce->ics.swb_sizes[g];
+ prev = sce->sf_idx[w*16+g];
+ }
+ }
+ if (tbits > destbits) {
+ for (i = 0; i < 128; i++)
+ if (sce->sf_idx[i] < 218 - qstep)
+ sce->sf_idx[i] += qstep;
+ } else {
+ for (i = 0; i < 128; i++)
+ if (sce->sf_idx[i] > 60 - qstep)
+ sce->sf_idx[i] -= qstep;
+ }
+ qstep >>= 1;
+ if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217)
+ qstep = 1;
+ } while (qstep);
+
+ fflag = 0;
+ minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF);
+
+ for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
+ for (g = 0; g < sce->ics.num_swb; g++) {
+ int prevsc = sce->sf_idx[w*16+g];
+ if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) {
+ if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1))
+ sce->sf_idx[w*16+g]--;
+ else //Try to make sure there is some energy in every band
+ sce->sf_idx[w*16+g]-=2;
+ }
+ sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF);
+ sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219);
+ if (sce->sf_idx[w*16+g] != prevsc)
+ fflag = 1;
+ sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]);
+ }
+ }
+ its++;
+ } while (fflag && its < 10);
}
static void search_for_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
ff_init_nextband_map(sce, nextband);
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
int wstart = w*128;
- for (g = 0; g < sce->ics.num_swb; g++) {
+ for (g = 0; g < sce->ics.num_swb; g++) {
int noise_sfi;
float dist1 = 0.0f, dist2 = 0.0f, noise_amp;
float pns_energy = 0.0f, pns_tgt_energy, energy_ratio, dist_thresh;
memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
- for (g = 0; g < sce->ics.num_swb; g++) {
+ for (g = 0; g < sce->ics.num_swb; g++) {
float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;
float min_energy = -1.0f, max_energy = 0.0f;
const int start = sce->ics.swb_offset[g];
prev_side = sce1->sf_idx[0];
for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) {
start = 0;
- for (g = 0; g < sce0->ics.num_swb; g++) {
+ for (g = 0; g < sce0->ics.num_swb; g++) {
float bmax = bval2bmax(g * 17.0f / sce0->ics.num_swb) / 0.0045f;
if (!cpe->is_mask[w*16+g])
cpe->ms_mask[w*16+g] = 0;
},
[AAC_CODER_FAST] = {
search_for_quantizers_fast,
- encode_window_bands_info,
+ codebook_trellis_rate,
quantize_and_encode_band,
ff_aac_encode_tns_info,
ff_aac_encode_ltp_info,
projects / ffmpeg / blobdiff