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){    FFPsyBand *band;    int w, g, w2, i;    int wlen = 1024 / sce->ics.num_windows;    int bandwidth, cutoff;    float *PNS = &s->scoefs[0*128], *PNS34 = &s->scoefs[1*128];    float *NOR34 = &s->scoefs[3*128];    uint8_t nextband[128];    const float lambda = s->lambda;    const float freq_mult = avctx->sample_rate*0.5f/wlen;    const float thr_mult = NOISE_LAMBDA_REPLACE*(100.0f/lambda);    const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));    const float dist_bias = av_clipf(4.f * 120 / lambda, 0.25f, 4.0f);    const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);     int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate        / ((avctx->flags & AV_CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)        * (lambda / 120.f);     /** Keep this in sync with twoloop's cutoff selection */    float rate_bandwidth_multiplier = 1.5f;    int prev = -1000, prev_sf = -1;    int frame_bit_rate = (avctx->flags & AV_CODEC_FLAG_QSCALE)        ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)        : (avctx->bit_rate / avctx->channels);     frame_bit_rate *= 1.15f;     if (avctx->cutoff > 0) {        bandwidth = avctx->cutoff;    } else {        bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));    }     cutoff = bandwidth * 2 * wlen / avctx->sample_rate;     memcpy(sce->band_alt, sce->band_type, sizeof(sce->band_type));    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++) {            int noise_sfi;            float dist1 = 0.0f, dist2 = 0.0f, noise_amp;            float pns_energy = 0.0f, pns_tgt_energy, energy_ratio, dist_thresh;            float sfb_energy = 0.0f, threshold = 0.0f, spread = 2.0f;            float min_energy = -1.0f, max_energy = 0.0f;            const int start = wstart+sce->ics.swb_offset[g];            const float freq = (start-wstart)*freq_mult;            const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);            if (freq < NOISE_LOW_LIMIT || (start-wstart) >= cutoff) {                if (!sce->zeroes[w*16+g])                    prev_sf = sce->sf_idx[w*16+g];                continue;            }            for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {                band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];                sfb_energy += band->energy;                spread     = FFMIN(spread, band->spread);                threshold  += band->threshold;                if (!w2) {                    min_energy = max_energy = band->energy;                } else {                    min_energy = FFMIN(min_energy, band->energy);                    max_energy = FFMAX(max_energy, band->energy);                }            }             /* Ramps down at ~8000Hz and loosens the dist threshold */            dist_thresh = av_clipf(2.5f*NOISE_LOW_LIMIT/freq, 0.5f, 2.5f) * dist_bias;             /* PNS is acceptable when all of these are true:             * 1. high spread energy (noise-like band)             * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)             * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)             *             * At this stage, point 2 is relaxed for zeroed bands near the noise threshold (hole avoidance is more important)             */            if ((!sce->zeroes[w*16+g] && !ff_sfdelta_can_remove_band(sce, nextband, prev_sf, w*16+g)) ||                ((sce->zeroes[w*16+g] || !sce->band_alt[w*16+g]) && sfb_energy < threshold*sqrtf(1.0f/freq_boost)) || spread < spread_threshold ||                (!sce->zeroes[w*16+g] && sce->band_alt[w*16+g] && sfb_energy > threshold*thr_mult*freq_boost) ||                min_energy < pns_transient_energy_r * max_energy ) {                sce->pns_ener[w*16+g] = sfb_energy;                if (!sce->zeroes[w*16+g])                    prev_sf = sce->sf_idx[w*16+g];                continue;            }             pns_tgt_energy = sfb_energy*FFMIN(1.0f, spread*spread);            noise_sfi = av_clip(roundf(log2f(pns_tgt_energy)*2), -100, 155); /* Quantize */            noise_amp = -ff_aac_pow2sf_tab[noise_sfi + POW_SF2_ZERO];    /* Dequantize */            if (prev != -1000) {                int noise_sfdiff = noise_sfi - prev + SCALE_DIFF_ZERO;                if (noise_sfdiff < 0 || noise_sfdiff > 2*SCALE_MAX_DIFF) {                    if (!sce->zeroes[w*16+g])                        prev_sf = sce->sf_idx[w*16+g];                    continue;                }            }            for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {                float band_energy, scale, pns_senergy;                const int start_c = (w+w2)*128+sce->ics.swb_offset[g];                band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];                for (i = 0; i < sce->ics.swb_sizes[g]; i++) {                    s->random_state  = lcg_random(s->random_state);                    PNS[i] = s->random_state;                }                band_energy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);                scale = noise_amp/sqrtf(band_energy);                s->fdsp->vector_fmul_scalar(PNS, PNS, scale, sce->ics.swb_sizes[g]);                pns_senergy = s->fdsp->scalarproduct_float(PNS, PNS, sce->ics.swb_sizes[g]);                pns_energy += pns_senergy;                s->abs_pow34(NOR34, &sce->coeffs[start_c], sce->ics.swb_sizes[g]);                s->abs_pow34(PNS34, PNS, sce->ics.swb_sizes[g]);                dist1 += quantize_band_cost(s, &sce->coeffs[start_c],                                            NOR34,                                            sce->ics.swb_sizes[g],                                            sce->sf_idx[(w+w2)*16+g],                                            sce->band_alt[(w+w2)*16+g],                                            lambda/band->threshold, INFINITY, NULL, NULL, 0);                /* Estimate rd on average as 5 bits for SF, 4 for the CB, plus spread energy * lambda/thr */                dist2 += band->energy/(band->spread*band->spread)*lambda*dist_thresh/band->threshold;            }            if (g && sce->band_type[w*16+g-1] == NOISE_BT) {                dist2 += 5;            } else {                dist2 += 9;            }            energy_ratio = pns_tgt_energy/pns_energy; /* Compensates for quantization error */            sce->pns_ener[w*16+g] = energy_ratio*pns_tgt_energy;            if (sce->zeroes[w*16+g] || !sce->band_alt[w*16+g] || (energy_ratio > 0.85f && energy_ratio < 1.25f && dist2 < dist1)) {                sce->band_type[w*16+g] = NOISE_BT;                sce->zeroes[w*16+g] = 0;                prev = noise_sfi;            } else {                if (!sce->zeroes[w*16+g])                    prev_sf = sce->sf_idx[w*16+g];            }        }    }} static void mark_pns(AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce){    FFPsyBand *band;    int w, g, w2;    int wlen = 1024 / sce->ics.num_windows;    int bandwidth, cutoff;    const float lambda = s->lambda;    const float freq_mult = avctx->sample_rate*0.5f/wlen;    const float spread_threshold = FFMIN(0.75f, NOISE_SPREAD_THRESHOLD*FFMAX(0.5f, lambda/100.f));    const float pns_transient_energy_r = FFMIN(0.7f, lambda / 140.f);     int refbits = avctx->bit_rate * 1024.0 / avctx->sample_rate        / ((avctx->flags & AV_CODEC_FLAG_QSCALE) ? 2.0f : avctx->channels)        * (lambda / 120.f);     /** Keep this in sync with twoloop's cutoff selection */    float rate_bandwidth_multiplier = 1.5f;    int frame_bit_rate = (avctx->flags & AV_CODEC_FLAG_QSCALE)        ? (refbits * rate_bandwidth_multiplier * avctx->sample_rate / 1024)        : (avctx->bit_rate / avctx->channels);     frame_bit_rate *= 1.15f;     if (avctx->cutoff > 0) {        bandwidth = avctx->cutoff;    } else {        bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_bit_rate, 1, avctx->sample_rate));    }     cutoff = bandwidth * 2 * wlen / avctx->sample_rate;     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++) {            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];            const float freq = start*freq_mult;            const float freq_boost = FFMAX(0.88f*freq/NOISE_LOW_LIMIT, 1.0f);            if (freq < NOISE_LOW_LIMIT || start >= cutoff) {                sce->can_pns[w*16+g] = 0;                continue;            }            for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) {                band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g];                sfb_energy += band->energy;                spread     = FFMIN(spread, band->spread);                threshold  += band->threshold;                if (!w2) {                    min_energy = max_energy = band->energy;                } else {                    min_energy = FFMIN(min_energy, band->energy);                    max_energy = FFMAX(max_energy, band->energy);                }            }             /* PNS is acceptable when all of these are true:             * 1. high spread energy (noise-like band)             * 2. near-threshold energy (high PE means the random nature of PNS content will be noticed)             * 3. on short window groups, all windows have similar energy (variations in energy would be destroyed by PNS)             */            sce->pns_ener[w*16+g] = sfb_energy;            if (sfb_energy < threshold*sqrtf(1.5f/freq_boost) || spread < spread_threshold || min_energy < pns_transient_energy_r * max_energy) {                sce->can_pns[w*16+g] = 0;            } else {                sce->can_pns[w*16+g] = 1;            }        }    }} static void search_for_ms(AACEncContext *s, ChannelElement *cpe){    int start = 0, i, w, w2, g, sid_sf_boost, prev_mid, prev_side;    uint8_t nextband0[128], nextband1[128];    float *M   = s->scoefs + 128*0, *S   = s->scoefs + 128*1;    float *L34 = s->scoefs + 128*2, *R34 = s->scoefs + 128*3;    float *M34 = s->scoefs + 128*4, *S34 = s->scoefs + 128*5;    const float lambda = s->lambda;    const float mslambda = FFMIN(1.0f, lambda / 120.f);    SingleChannelElement *sce0 = &cpe->ch[0];    SingleChannelElement *sce1 = &cpe->ch[1];    if (!cpe->common_window)        return;     /** Scout out next nonzero bands */    ff_init_nextband_map(sce0, nextband0);    ff_init_nextband_map(sce1, nextband1);     prev_mid = sce0->sf_idx[0];    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++) {            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;            if (!sce0->zeroes[w*16+g] && !sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g]) {                float Mmax = 0.0f, Smax = 0.0f;                 /* Must compute mid/side SF and book for the whole window group */                for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {                    for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {                        M[i] = (sce0->coeffs[start+(w+w2)*128+i]                              + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;                        S[i] =  M[i]                              - sce1->coeffs[start+(w+w2)*128+i];                    }                    s->abs_pow34(M34, M, sce0->ics.swb_sizes[g]);                    s->abs_pow34(S34, S, sce0->ics.swb_sizes[g]);                    for (i = 0; i < sce0->ics.swb_sizes[g]; i++ ) {                        Mmax = FFMAX(Mmax, M34[i]);                        Smax = FFMAX(Smax, S34[i]);                    }                }                 for (sid_sf_boost = 0; sid_sf_boost < 4; sid_sf_boost++) {                    float dist1 = 0.0f, dist2 = 0.0f;                    int B0 = 0, B1 = 0;                    int minidx;                    int mididx, sididx;                    int midcb, sidcb;                     minidx = FFMIN(sce0->sf_idx[w*16+g], sce1->sf_idx[w*16+g]);                    mididx = av_clip(minidx, 0, SCALE_MAX_POS - SCALE_DIV_512);                    sididx = av_clip(minidx - sid_sf_boost * 3, 0, SCALE_MAX_POS - SCALE_DIV_512);                    if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT                        && (   !ff_sfdelta_can_replace(sce0, nextband0, prev_mid, mididx, w*16+g)                            || !ff_sfdelta_can_replace(sce1, nextband1, prev_side, sididx, w*16+g))) {                        /* scalefactor range violation, bad stuff, will decrease quality unacceptably */                        continue;                    }                     midcb = find_min_book(Mmax, mididx);                    sidcb = find_min_book(Smax, sididx);                     /* No CB can be zero */                    midcb = FFMAX(1,midcb);                    sidcb = FFMAX(1,sidcb);                     for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {                        FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];                        FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];                        float minthr = FFMIN(band0->threshold, band1->threshold);                        int b1,b2,b3,b4;                        for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {                            M[i] = (sce0->coeffs[start+(w+w2)*128+i]                                  + sce1->coeffs[start+(w+w2)*128+i]) * 0.5;                            S[i] =  M[i]                                  - sce1->coeffs[start+(w+w2)*128+i];                        }                         s->abs_pow34(L34, sce0->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);                        s->abs_pow34(R34, sce1->coeffs+start+(w+w2)*128, sce0->ics.swb_sizes[g]);                        s->abs_pow34(M34, M,                         sce0->ics.swb_sizes[g]);                        s->abs_pow34(S34, S,                         sce0->ics.swb_sizes[g]);                        dist1 += quantize_band_cost(s, &sce0->coeffs[start + (w+w2)*128],                                                    L34,                                                    sce0->ics.swb_sizes[g],                                                    sce0->sf_idx[w*16+g],                                                    sce0->band_type[w*16+g],                                                    lambda / band0->threshold, INFINITY, &b1, NULL, 0);                        dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+w2)*128],                                                    R34,                                                    sce1->ics.swb_sizes[g],                                                    sce1->sf_idx[w*16+g],                                                    sce1->band_type[w*16+g],                                                    lambda / band1->threshold, INFINITY, &b2, NULL, 0);                        dist2 += quantize_band_cost(s, M,                                                    M34,                                                    sce0->ics.swb_sizes[g],                                                    mididx,                                                    midcb,                                                    lambda / minthr, INFINITY, &b3, NULL, 0);                        dist2 += quantize_band_cost(s, S,                                                    S34,                                                    sce1->ics.swb_sizes[g],                                                    sididx,                                                    sidcb,                                                    mslambda / (minthr * bmax), INFINITY, &b4, NULL, 0);                        B0 += b1+b2;                        B1 += b3+b4;                        dist1 -= b1+b2;                        dist2 -= b3+b4;                    }                    cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0;                    if (cpe->ms_mask[w*16+g]) {                        if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT) {                            sce0->sf_idx[w*16+g] = mididx;                            sce1->sf_idx[w*16+g] = sididx;                            sce0->band_type[w*16+g] = midcb;                            sce1->band_type[w*16+g] = sidcb;                        } else if ((sce0->band_type[w*16+g] != NOISE_BT) ^ (sce1->band_type[w*16+g] != NOISE_BT)) {                            /* ms_mask unneeded, and it confuses some decoders */                            cpe->ms_mask[w*16+g] = 0;                        }                        break;                    } else if (B1 > B0) {                        /* More boost won't fix this */                        break;                    }                }            }            if (!sce0->zeroes[w*16+g] && sce0->band_type[w*16+g] < RESERVED_BT)                prev_mid = sce0->sf_idx[w*16+g];            if (!sce1->zeroes[w*16+g] && !cpe->is_mask[w*16+g] && sce1->band_type[w*16+g] < RESERVED_BT)                prev_side = sce1->sf_idx[w*16+g];            start += sce0->ics.swb_sizes[g];        }    }} AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = {    [AAC_CODER_ANMR] = {        search_for_quantizers_anmr,        encode_window_bands_info,        quantize_and_encode_band,        ff_aac_encode_tns_info,        ff_aac_encode_ltp_info,        ff_aac_encode_main_pred,        ff_aac_adjust_common_pred,        ff_aac_adjust_common_ltp,        ff_aac_apply_main_pred,        ff_aac_apply_tns,        ff_aac_update_ltp,        ff_aac_ltp_insert_new_frame,        set_special_band_scalefactors,        search_for_pns,        mark_pns,        ff_aac_search_for_tns,        ff_aac_search_for_ltp,        search_for_ms,        ff_aac_search_for_is,        ff_aac_search_for_pred,    },    [AAC_CODER_TWOLOOP] = {        search_for_quantizers_twoloop,        codebook_trellis_rate,        quantize_and_encode_band,        ff_aac_encode_tns_info,        ff_aac_encode_ltp_info,        ff_aac_encode_main_pred,        ff_aac_adjust_common_pred,        ff_aac_adjust_common_ltp,        ff_aac_apply_main_pred,        ff_aac_apply_tns,        ff_aac_update_ltp,        ff_aac_ltp_insert_new_frame,        set_special_band_scalefactors,        search_for_pns,        mark_pns,        ff_aac_search_for_tns,        ff_aac_search_for_ltp,        search_for_ms,        ff_aac_search_for_is,        ff_aac_search_for_pred,    },    [AAC_CODER_FAST] = {        search_for_quantizers_fast,        codebook_trellis_rate,        quantize_and_encode_band,        ff_aac_encode_tns_info,        ff_aac_encode_ltp_info,        ff_aac_encode_main_pred,        ff_aac_adjust_common_pred,        ff_aac_adjust_common_ltp,        ff_aac_apply_main_pred,        ff_aac_apply_tns,        ff_aac_update_ltp,        ff_aac_ltp_insert_new_frame,        set_special_band_scalefactors,        search_for_pns,        mark_pns,        ff_aac_search_for_tns,        ff_aac_search_for_ltp,        search_for_ms,        ff_aac_search_for_is,        ff_aac_search_for_pred,    },};

Lines 501–964 of 964. Previous lines