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commit 646f2796c8e267fd77b6f6dacc60c6e9ea333c95 Author: Lynne <[email protected]> AuthorDate: Fri Jul 17 14:19:01 2026 +0800 Commit: Lynne <[email protected]> CommitDate: Sun Jul 19 20:41:52 2026 +0800 avcodec/aacenc: rework NMR rate control, pool CPE budgets, add decision memory Rate control: replace the integral servo with a stateless pressure offset (exp2(-K*fill/R)) so a drained reservoir cannot wind up and crater quality after loud stretches; slew-limit the final operating lambda per frame (bits deviate instead, the reservoir absorbs); seed the reservoir full at stream start; and track rate strain explicitly: a long-frame lambda EMA against anchors that scale up when the achieved distortion/mask ratio flags noise-class content (whose psy masks are wholesale violated and lambda reads inflated), plus a lambda min-tracker separating sustained starvation from transient spikes at a comfortable operating point. The resulting pressure ramp gates every pressure-adaptive tool from one place. CPE budget pooling: solve both channels of a pair jointly under one shared lambda against a pooled budget (NMRSlot defer/solve/commit) instead of an equal per-channel split, which starved the mid/carrier while the side gold-plated. Mono and VBR output are unchanged. Transients: isolated onsets are coded uniformly finer across the short run and repaid from steady stretches; dense-beat runs get a starvation-scaled boost; a transition premask clamps START-frame thresholds toward the previous long frame (an attack cannot mask backwards). Decision memory: marginal per-frame re-decisions oscillate audibly, so every stateful choice now carries hysteresis - band zeroing, PNS enter/leave with debounce (and near-masked bands staying noise until a loudness guard), per-grid stereo mode banks that survive window switches, and the short-TNS accept state. TNS-covered bands price distortion by the synthesis filter's re-amplification gain, so the trellis spends where noise will actually be heard. --- libavcodec/aaccoder_nmr.h | 988 ++++++++++++++------- libavcodec/aacenc.h | 58 +- tests/ref/fate/id3v2-reenc-delete-metadata | 4 +- tests/ref/fate/id3v2-reenc-delete-metadata-keep | 4 +- .../fate/id3v2-reenc-delete-metadata-keep-format | 4 +- .../fate/id3v2-reenc-delete-metadata-keep-stream | 4 +- .../fate/id3v2-reenc-delete-metadata-map-metadata | 4 +- 7 files changed, 711 insertions(+), 355 deletions(-) diff --git a/libavcodec/aaccoder_nmr.h b/libavcodec/aaccoder_nmr.h index 7a01a57570..224cb24d7d 100644 --- a/libavcodec/aaccoder_nmr.h +++ b/libavcodec/aaccoder_nmr.h @@ -83,15 +83,29 @@ * smooth while per-frame demand is tracked; 1.5 cuts lambda jitter ~25%. */ #define NMR_RC_CORR 1.5f -/* Leaky-bucket half-depth (bits/ch); 512 is the sweet spot — tighter rebounds as - * frames cannot hit the narrow window. Clamped to the 6144 bits/ch decoder buffer. */ -#define NMR_CBR_BUF 512 +/* Reservoir half-window (bits/ch); swept 512/1536/3072, 1536 optimal. */ +#define NMR_CBR_BUF 1536 +/* Slew limit on the FINAL operating lambda per frame; bits deviate instead, + * the reservoir absorbs. See memory: aac-castanets-transient-rc. */ +#define NMR_SLEW 1.6f +#define NMR_SLEW_RUN 1.15f /* within short runs */ #define NMR_RC_CITERS 3 /* corridor coarse-pass iters */ +/* Transition premask: an attack cannot mask backwards; clamp a START frame's + * thresholds toward the previous long frame's. */ +#define NMR_TRANS_PM 2.0f + +/* Zero-decision hysteresis: previously-coded bands need this margin below + * threshold to zero (marginal bands flicker audibly otherwise). */ +#define NMR_ZERO_STICKY 0.5f + /* Transient bit-burst: an isolated onset (preceded by >= NMR_BURST_GAP long frames) * is coded NMR_BURST_GAIN x finer, held uniform across the run, repaid from steady stretches. */ #define NMR_BURST_GAP 10 #define NMR_BURST_GAIN 8.0f +/* Dense-beat boost: short runs with gap < NMR_BURST_GAP get a budget factor + * ramping with the gap (starvation-scaled at the use site). */ +#define NMR_SHORT_BOOST 2.0f #define NMR_RC_FITERS 4 /* corridor fine-pass iters */ #define NMR_RC_TRACK 0.1f /* per-frame pull of the corridor centre toward the realized lambda */ @@ -106,6 +120,14 @@ * substituting real texture for 9 signalling bits is net-negative. */ #define NMR_PNS_LAM 100.0f +/* PNS decision hysteresis: enter and leave both cost a margin. */ +#define NMR_PNS_ENTER 0.7f +#define NMR_PNS_STAY 1.4f +/* PNS debounce: enter after NMR_PNS_ON consecutive wants, leave after + * NMR_PNS_OFF (chronically marginal bands never qualify). */ +#define NMR_PNS_ON 8 +#define NMR_PNS_OFF 4 + /** * Viterbi over the coding sequence act[0..nact-1] (indices into the per-band * curves nd/nb), with lambda binary-searched so the coded size ~ destbits. @@ -201,128 +223,86 @@ static int nmr_band_curve(AACEncContext *s, SingleChannelElement *sce, int w, in return ncand; } -static void search_for_quantizers_nmr(AVCodecContext *avctx, - AACEncContext *s, - SingleChannelElement *sce, - const float lambda) +/* Zero a channel with nothing codeable; stale band_types would resurrect + * bands with chain-illegal scalefactors. */ +static void nmr_bail_channel(SingleChannelElement *sce) { - int bch = ((avctx->flags & AV_CODEC_FLAG_QSCALE) ? 2.0f : avctx->ch_layout.nb_channels); - int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / bch * (lambda / 120.f); - int allz = 0, cutoff = 1024, nbnd = 0; + for (int i = 0; i < 128; i++) { + if (sce->band_type[i] == INTENSITY_BT || sce->band_type[i] == INTENSITY_BT2) + continue; + sce->zeroes[i] = 1; + sce->band_type[i] = 0; + } +} - float thr[128]; /* allocation-law effective threshold (drives the trellis) */ - float thr_real[128]; /* real masking threshold (perceptual gates: PNS) */ - float pener[128]; /* band energy (for PNS noise target) */ - float pspread[128]; /* band tonality spread (1 = noise) */ - int minsf[128]; - float maxvals[128]; - - /* coded-band trellis state (indexed 0..nbnd-1) */ - int bidx[128]; /* sce band index (w*16+g) */ - int bw[128], bg[128], bst[128]; /* window group, swb, coef start per coded band */ - int blo[128]; /* finest candidate scalefactor */ - int bnc[128]; /* number of candidates */ - int chosen[128]; - int act[128]; /* active (non-PNS) band coding order */ - uint8_t is_pns[128]; /* trellis band coded as noise */ - - float (*nd)[NMR_NCAND] = s->nmr->nd; /* dist / threshold per candidate (heap) */ - int (*nb)[NMR_NCAND] = s->nmr->nb; /* spectral bits per candidate (heap) */ - - /* two-pass coarse->fine grid step (see NMR_COARSE), the lambda search runs on - * the cheap coarse grid, PASS 2 refines the winner at NMR_STEP granularity */ +/* Per-channel setup into slot t: short-block threshold shaping, the + * allocation law, zero decisions, and the PASS 1 coarse candidate curves. + * Returns the coded-band count; 0 = nothing codeable (caller bails). */ +static int nmr_setup_channel(AVCodecContext *avctx, AACEncContext *s, + SingleChannelElement *sce, NMRSlot *t) +{ + float (*nd)[NMR_NCAND] = s->nmr->nd[t->si]; + int (*nb)[NMR_NCAND] = s->nmr->nb[t->si]; const int cstep = NMR_COARSE > 0 ? NMR_COARSE : NMR_STEP; + int allz = 0, cutoff = 1024, nbnd = 0; - s->nmr->counted[s->cur_channel] = 0; - - /* Global-lambda RC: one solve per frame at a servoed centre lambda; the reservoir - * holds the long-run mean rate. Bypassed for VBR (-q:a) and the bootstrap frame. */ - int rc_eligible = !(avctx->flags & AV_CODEC_FLAG_QSCALE) && avctx->bit_rate > 0 && - avctx->bit_rate_tolerance != 0; - /* Leaky-bucket reservoir: rc_fill (signed +-rc_bmax); the spend-floor/cap below force - * lambda so no frame banks past +rc_bmax or borrows past -rc_bmax. */ - int rc_rate_frame = avctx->bit_rate * 1024.0 / avctx->sample_rate; - int rc_bmax = FFMIN(FFMAX(6144 * s->channels - rc_rate_frame, 256), NMR_CBR_BUF * s->channels); - if (rc_eligible && avctx->frame_num != s->nmr->rc_frame_num) { - if (s->nmr->rc_frame_num > 0 && s->nmr->lam_rc > 0.0f) - s->nmr->rc_fill = av_clip(s->nmr->rc_fill + rc_rate_frame - s->last_frame_pb_count, - -rc_bmax, rc_bmax); - s->nmr->rc_frame_num = avctx->frame_num; - - /* Transient burst run state: set at run start and held across the run so - * coding stays uniform; repaid from the reservoir's steady stretches. */ - int is_short = sce->ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE; - if (is_short) { - if (!s->nmr->prev_was_short) /* run start */ - s->nmr->run_burst = s->nmr->frames_since_short >= NMR_BURST_GAP - ? NMR_BURST_GAIN : 1.0f; - s->nmr->frames_since_short = 0; - } else { - s->nmr->run_burst = 1.0f; - s->nmr->frames_since_short++; - } - s->nmr->prev_was_short = is_short; + uint8_t *zprev = s->nmr->zero_prev[s->cur_channel & 15]; + if (s->nmr->zero_nw[s->cur_channel & 15] != sce->ics.num_windows) { + memset(zprev, 1, 128); + s->nmr->zero_nw[s->cur_channel & 15] = sce->ics.num_windows; } - int rc_global = rc_eligible && s->nmr->lam_rc > 0.0f; - - if (s->psy.bitres.alloc >= 0) - destbits = s->psy.bitres.alloc * - (lambda / (avctx->global_quality ? avctx->global_quality : 120)); - if (rc_global && s->psy.bitres.alloc >= 0) - /* uniform CBR target: nominal rate plus fast reservoir repayment */ - destbits = (avctx->bit_rate * 1024.0 / avctx->sample_rate - + s->nmr->rc_fill / 2.0) / s->channels; - destbits = FFMIN(destbits, 5800); - /* honest budget: subtract the measured non-trellis overhead (section data, ICS, - * sf/PNS signalling), which is rate-dependent hence adaptive. */ - if (s->nmr->side_inited) - destbits = av_clip(destbits - (int)(s->nmr->side_ema / s->channels), 64, 5800); - /* Apply the held transient burst factor (set in the run-state machine above). */ - if (sce->ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE && s->nmr->run_burst > 1.0f) - destbits = av_clip((int)(destbits * s->nmr->run_burst), 64, 6800); + t->sce = sce; + t->cur_ch = s->cur_channel; + t->is8 = sce->ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE; + t->nbnd = t->nact = 0; /* band cutoff index for this frame's window size; the bandwidth is fixed * at init and shared with the psy model */ cutoff = s->bandwidth * 2 * (1024 / sce->ics.num_windows) / avctx->sample_rate; - /* Short-block transient noise shaping (pairs with short-block TNS): temporal - * premasking clamps each window's threshold toward the preceding windows' - * (Apple's preEchoReduction), and flat-residual flattens each window's thresholds - * to their per-window mean so TNS synthesis has a white floor to concentrate. */ + /* Short-block shaping: temporal premask + per-window threshold flatten. */ if (sce->ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE) { const float pm_p1 = 0.1f, pm_p2 = 2.0f, pm_p3 = 4.0f; for (int g = 0; g < sce->ics.num_swb; g++) { float t1 = FLT_MAX, t2 = FLT_MAX; /* original thr of w-1, w-2 */ for (int w = 0; w < sce->ics.num_windows; w++) { FFPsyBand *b = &s->psy.ch[s->cur_channel].psy_bands[w*16+g]; - float t = b->threshold; - float c = FFMIN(t, FFMIN(t1*pm_p2, t2*pm_p3)); - b->threshold = FFMAX(c, t*pm_p1); - t2 = t1; t1 = t; + float th = b->threshold; + float c = FFMIN(th, FFMIN(t1*pm_p2, t2*pm_p3)); + b->threshold = FFMAX(c, th*pm_p1); + t2 = t1; t1 = th; } } { for (int w = 0; w < sce->ics.num_windows; w++) { - float sum = 0.0f; int n = 0; + float sum = 0.0f, esum = 0.0f; int n = 0; for (int g = 0; g < sce->ics.num_swb; g++) { FFPsyBand *b = &s->psy.ch[s->cur_channel].psy_bands[w*16+g]; - if (b->energy > b->threshold && b->threshold > 0.0f) { sum += b->threshold; n++; } + if (b->energy > b->threshold && b->threshold > 0.0f) { sum += b->threshold; esum += b->energy; n++; } } if (n > 0) { - float mean = sum / n; + /* keep each window codeable: cap the mean 12dB under the + * window's mean audible energy */ + float mean = FFMIN(sum / n, (esum / n) * expf(-12.0f * (float)M_LN10 / 10.0f)); for (int g = 0; g < sce->ics.num_swb; g++) { FFPsyBand *b = &s->psy.ch[s->cur_channel].psy_bands[w*16+g]; if (b->energy > b->threshold && b->threshold > 0.0f) - b->threshold = mean; + b->threshold = FFMIN(mean, b->threshold * 1e9f); } } } } } - /* Allocation curve to favour high frequencies */ - const float a_ae = 0.443f, a_at = 0.111f; + /* Allocation law; short frames blend to softer energy exponents under + * pressure (roll anti-starvation, see memory). */ + float a_ae = 0.443f, a_at = 0.111f; + if (sce->ics.num_windows == 8 && s->nmr) { + /* blend to mask-weighted exponents under rate pressure */ + a_ae += (0.35f - a_ae) * s->nmr->press; + a_at += (0.3f - a_at) * s->nmr->press; + } for (int w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { int start = 0; for (int g = 0; g < sce->ics.num_swb; start += sce->ics.swb_sizes[g++]) { @@ -336,69 +316,128 @@ static void search_for_quantizers_nmr(AVCodecContext *avctx, sce->zeroes[(w+w2)*16+g] = 0; continue; } + float zthr_mul = zprev[w*16+g] ? 1.0f : NMR_ZERO_STICKY; + /* M/S side bands: zero-reluctance scaled by side/mid ratio (a tiny + * side IS the image; zeroing it flickers). */ + if ((t->cur_ch & 1) && s->nmr && s->nmr->pair && + s->nmr->smode_band[(t->cur_ch >> 1) & 7][w*16+g] == 1) { + const FFPsyBand *mb = &s->psy.ch[s->cur_channel - 1].psy_bands[w*16+g]; + float ratio = 0.0f; + float eside = 0.0f; + for (int w2 = 0; w2 < sce->ics.group_len[w]; w2++) { + const FFPsyBand *bb = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; + eside += bb->energy; + } + ratio = eside / FFMAX(mb->energy * sce->ics.group_len[w], 1e-9f); + zthr_mul *= 0.25f + 0.75f * av_clipf(ratio / 0.3f, 0.0f, 1.0f); + } for (int w2 = 0; w2 < sce->ics.group_len[w]; w2++) { FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; ener += band->energy; spread = FFMIN(spread, band->spread); - if (start >= cutoff || band->energy <= band->threshold || band->threshold == 0.0f) { + if (start >= cutoff || band->energy <= band->threshold * zthr_mul || + band->threshold == 0.0f) { sce->zeroes[(w+w2)*16+g] = 1; continue; } uplim += band->threshold; nz = 1; } + zprev[w*16+g] = !nz; sce->zeroes[w*16+g] = !nz; - thr_real[w*16+g] = uplim; /* real mask, before the allocation law (PNS gate) */ - if (nz && ener > 0.0f && uplim > 0.0f) + t->thr_real[w*16+g] = uplim; /* real mask, before the allocation law (PNS gate) */ + if (nz && ener > 0.0f && uplim > 0.0f) /* allocation law */ uplim = expf(a_ae * logf(ener) + a_at * logf(uplim)); - thr[w*16+g] = uplim; - pener[w*16+g] = ener; - pspread[w*16+g] = spread; + t->thr[w*16+g] = uplim; + t->pener[w*16+g] = ener; + t->pspread[w*16+g] = spread; allz |= nz; } } if (!allz) - goto bail; + return 0; + + /* transition premask (see NMR_TRANS_PM) */ + if (sce->ics.num_windows == 1) { + int ci = t->cur_ch & 15; + if (sce->ics.window_sequence[0] == LONG_START_SEQUENCE && + s->nmr->thr_prev_ok[ci]) { + for (int g = 0; g < sce->ics.num_swb && g < 64; g++) + if (t->thr[g] > 0.0f && s->nmr->thr_prev[ci][g] > 0.0f) + t->thr[g] = FFMIN(t->thr[g], s->nmr->thr_prev[ci][g] * NMR_TRANS_PM); + } + for (int g = 0; g < sce->ics.num_swb && g < 64; g++) + s->nmr->thr_prev[ci][g] = t->thr[g]; + s->nmr->thr_prev_ok[ci] = 1; + } else { + s->nmr->thr_prev_ok[t->cur_ch & 15] = 0; + } s->aacdsp.abs_pow34(s->scoefs, sce->coeffs, 1024); ff_quantize_band_cost_cache_init(s); + /* TNS synthesis gain per band: the decoder re-amplifies residual-domain + * quantization noise by the whitening gain (shorts only). */ + for (int i = 0; i < 128; i++) + t->tnsg[i] = 1.0f; + if (sce->ics.num_windows == 8 && sce->tns.present) { + const int mmm2 = FFMIN(sce->ics.tns_max_bands, sce->ics.max_sfb ? sce->ics.max_sfb : sce->ics.num_swb); + for (int w = 0; w < 8; w++) { + int bottom2 = sce->ics.num_swb; + for (int filt = 0; filt < sce->tns.n_filt[w]; filt++) { + int top2 = bottom2; + bottom2 = FFMAX(0, top2 - sce->tns.length[w][filt]); + if (!sce->tns.order[w][filt]) + continue; + for (int g = FFMIN(bottom2, mmm2); g < FFMIN(top2, mmm2); g++) { + int s0 = sce->ics.swb_offset[g] + w*128; + int s1 = sce->ics.swb_offset[g+1] + w*128; + float eres = 0.0f; + const FFPsyBand *pb = &s->psy.ch[s->cur_channel].psy_bands[w*16+g]; + for (int k = s0; k < s1; k++) + eres += sce->coeffs[k]*sce->coeffs[k]; + t->tnsg[w*16+g] = av_clipf(pb->energy / FFMAX(eres, 1e-12f), 1.0f, 64.0f); + } + } + } + } + /* finest codeable scalefactor and max value per band */ for (int w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { int start = w*128; for (int g = 0; g < sce->ics.num_swb; g++) { - maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs + start); - minsf[w*16+g] = maxvals[w*16+g] > 0 ? coef2minsf(maxvals[w*16+g]) : 0; + t->maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs + start); + t->minsf[w*16+g] = t->maxvals[w*16+g] > 0 ? coef2minsf(t->maxvals[w*16+g]) : 0; start += sce->ics.swb_sizes[g]; } } - /* PASS 1: - * precompute each coded band's cost curve at the coarse candidate step + /* PASS 1: coarse candidate curves per coded band * (the lambda search runs on this cheap grid, PASS 2 refines the winner) */ { for (int w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { int start = w*128; for (int g = 0; g < sce->ics.num_swb; g++) { - if (!sce->zeroes[w*16+g] && maxvals[w*16+g] > 0 && nbnd < 128) { - int lo = av_clip(minsf[w*16+g], 0, SCALE_MAX_POS); - float invthr = 1.0f / FFMAX(thr[w*16+g], 1e-9f); + if (!sce->zeroes[w*16+g] && t->maxvals[w*16+g] > 0 && nbnd < 128) { + int lo = av_clip(t->minsf[w*16+g], 0, SCALE_MAX_POS); + float invthr = 1.0f / FFMAX(t->thr[w*16+g], 1e-9f); int ncand = nmr_band_curve(s, sce, w, g, start, lo, cstep, NMR_NCAND, - invthr, maxvals[w*16+g], nd[nbnd], nb[nbnd]); + invthr, t->maxvals[w*16+g], nd[nbnd], nb[nbnd]); + if (t->tnsg[w*16+g] > 1.0f) + for (int o = 0; o < ncand; o++) + nd[nbnd][o] *= t->tnsg[w*16+g]; if (ncand == 0) { - /* nothing codeable -> drop the whole group band. The - * subwindow flags must be cleared too: the encoder later - * re-derives the group flag by ANDing them, which would - * resurrect the band with a never-assigned scalefactor. */ + /* nothing codeable: drop the group band incl. subwindow + * flags (group flag is re-derived by ANDing) */ for (int w2 = 0; w2 < sce->ics.group_len[w]; w2++) sce->zeroes[(w+w2)*16+g] = 1; } else { - bidx[nbnd] = w*16+g; - bw[nbnd] = w; - bg[nbnd] = g; - bst[nbnd] = start; - blo[nbnd] = lo; - bnc[nbnd] = ncand; + t->bidx[nbnd] = w*16+g; + t->bw[nbnd] = w; + t->bg[nbnd] = g; + t->bst[nbnd] = start; + t->blo[nbnd] = lo; + t->bnc[nbnd] = ncand; nbnd++; } } @@ -406,223 +445,94 @@ static void search_for_quantizers_nmr(AVCodecContext *avctx, } } } - if (!nbnd) - goto bail; + t->nbnd = nbnd; + for (int b = 0; b < nbnd; b++) { + t->act[b] = b; + t->is_pns[b] = 0; + } + t->nact = nbnd; + return nbnd; +} - /* solve the trellis over all coded bands, then offer PNS at the operating - * lambda and re-solve over the survivors with the freed budget */ - { - int nact = nbnd, pns_count = 0; - float lam0 = s->nmr->lam[s->cur_channel]; - float lam; +/* total bits of a slot's current chosen[] on grid `step`, incl. sf deltas */ +static int nmr_slot_bits(const NMRSlot *t, const int (*nb)[NMR_NCAND], int step) +{ + int tot = 0; + for (int k = 0; k < t->nact; k++) + tot += nb[t->act[k]][t->chosen[t->act[k]]]; + for (int k = 1; k < t->nact; k++) + tot += NMR_SFBITS((t->blo[t->act[k]]+t->chosen[t->act[k]]*step) - + (t->blo[t->act[k-1]]+t->chosen[t->act[k-1]]*step)); + return tot; +} - for (int b = 0; b < nbnd; b++) { - act[b] = b; - is_pns[b] = 0; - } - if (rc_global) { - /* bisect to this frame's bit demand within the corridor around the - * servoed lambda: per-frame psy demand is tracked, but lambda cannot - * jump, which keeps quality smooth across frames */ - float lo = s->nmr->lam_rc / NMR_RC_CORR; - /* Transient burst: widen the lower lambda bound so the bisection can actually - * pour the boosted destbits into an onset frame (finer coding kills the - * pre-echo); reservoir servo repays it from the steady frames. run_burst==1 on - * non-onset frames leaves the corridor unchanged. */ - if (sce->ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE && s->nmr->run_burst > 1.0f) - lo /= s->nmr->run_burst; - lam = nmr_solve(s, nd, nb, blo, bnc, cstep, act, nact, destbits, chosen, - lo, s->nmr->lam_rc * NMR_RC_CORR, - NMR_RC_CITERS); - - int tot = 0; - for (int k = 0; k < nact; k++) - tot += nb[act[k]][chosen[act[k]]]; - for (int k = 1; k < nact; k++) - tot += NMR_SFBITS((blo[act[k]]+chosen[act[k]]*cstep) - (blo[act[k-1]]+chosen[act[k-1]]*cstep)); - int hardcap = av_clip((int)(5800.f * FFMIN(1.f, lambda / 120.f)), 256, 5800); - /* leaky-bucket window: don't borrow past -rc_bmax (cap) or bank past +rc_bmax (floor) */ - int rc_cap = FFMIN(hardcap, (s->nmr->rc_fill + rc_rate_frame + rc_bmax) / s->channels); - int rc_floor = FFMAX(0, (s->nmr->rc_fill + rc_rate_frame - rc_bmax) / s->channels); - if (tot > rc_cap) - lam = nmr_solve(s, nd, nb, blo, bnc, cstep, act, nact, rc_cap, chosen, - lam, 1e4f, NMR_CITERS); - else if (tot < rc_floor) - lam = nmr_solve(s, nd, nb, blo, bnc, cstep, act, nact, rc_floor, chosen, - 1e-9f, lam, NMR_CITERS); - } else if (NMR_COARSE > 0 && lam0 > 0.0f) { - /* per-frame bisection; lambda is strongly frame-correlated, so when a - * previous frame's operating lambda exists, bisect a narrow bracket - * around it. A result near the bracket edge means the budget crossing - * lies outside (hard content transition) == redo the full search. */ - lam = nmr_solve(s, nd, nb, blo, bnc, cstep, act, nact, destbits, chosen, - lam0/32.0f, lam0*32.0f, NMR_CWARM); - if (lam < lam0/16.0f || lam > lam0*16.0f) - lam0 = 0.0f; - } - if (!rc_global && lam0 <= 0.0f) - lam = nmr_solve(s, nd, nb, blo, bnc, cstep, act, nact, destbits, chosen, - 1e-9f, 1e4f, NMR_COARSE > 0 ? NMR_CITERS : NMR_ITERS); - - /* PASS 2: - * refine each band at full granularity (NMR_STEP) in a +/-cstep window - * around the coarse pick, then re-solve. Recovers single-pass quality while the - * lambda search stayed cheap on the coarse grid. */ - if (NMR_COARSE > 0) { - /* nmr_speed, 0 = slowest/best, higher = faster. It narrows the fine - * refine +/-window (scalefactors) below NMR_COARSE: at speed 0 the window - * spans the whole coarse-grid gap, so the two-pass result matches the - * exhaustive single-pass search. - * Each speed level shaves one sf off the window. - * At @64k mono (Zim / xRT): speed 0 -> 0.00095/15x, - * 2 -> 0.00096/18x, 3 -> 0.00100/20x, 4 -> 0.00103/22x */ - int win = NMR_COARSE - av_clip(s->options.nmr_speed, 0, 4); - for (int b = 0; b < nbnd; b++) { - int center = blo[b] + chosen[b]*cstep; - int flo = av_clip(center - win, av_clip(minsf[bidx[b]], 0, SCALE_MAX_POS), SCALE_MAX_POS); - int maxn = FFMIN(NMR_NCAND, 2*win/NMR_STEP + 1); - float invthr = 1.0f / FFMAX(thr[bidx[b]], 1e-9f); - int ncand = nmr_band_curve(s, sce, bw[b], bg[b], bst[b], flo, NMR_STEP, maxn, - invthr, maxvals[bidx[b]], nd[b], nb[b]); - blo[b] = flo; - bnc[b] = FFMAX(1, ncand); - } - /* fine pass: narrow corridor around the coarse solve */ - if (rc_global) - lam = nmr_solve(s, nd, nb, blo, bnc, NMR_STEP, act, nact, destbits, chosen, - lam/2.0f, lam*2.0f, NMR_RC_FITERS); - else - lam = nmr_solve(s, nd, nb, blo, bnc, NMR_STEP, act, nact, destbits, chosen, - lam/16.0f, lam*16.0f, NMR_IFINE); - } +/* Run every slot's trellis at one fixed lambda; returns the pooled bits. */ +static int nmr_eval_slots(AACEncContext *s, NMRSlot *const *sl, int nsl, int step, float lam) +{ + int total = 0; + for (int k = 0; k < nsl; k++) { + NMRSlot *t = sl[k]; + if (!t->nact) + continue; + nmr_solve(s, s->nmr->nd[t->si], s->nmr->nb[t->si], t->blo, t->bnc, step, + t->act, t->nact, 0, t->chosen, lam, lam, 1); + total += nmr_slot_bits(t, s->nmr->nb[t->si], step); + } + return total; +} - if (rc_global) { - /* leaky-bucket clamp: keep the frame within [rc_floor, rc_cap] so the reservoir - * stays in +-rc_bmax -- clamp lambda UP if it would borrow past the cap, DOWN if it - * would bank past the floor (spend-floor). The hard cap follows the encoder's outer - * lambda so the (rare) hard-overflow re-encode -- which shrinks that lambda -- always - * converges; on the first pass lambda is nominal and this is 5800. */ - int hardcap = av_clip((int)(5800.f * FFMIN(1.f, lambda / 120.f)), 256, 5800); - int tot = 0; - for (int k = 0; k < nact; k++) - tot += nb[act[k]][chosen[act[k]]]; - for (int k = 1; k < nact; k++) - tot += NMR_SFBITS((blo[act[k]]+chosen[act[k]]*NMR_STEP) - (blo[act[k-1]]+chosen[act[k-1]]*NMR_STEP)); - int rc_cap = FFMIN(hardcap, (s->nmr->rc_fill + rc_rate_frame + rc_bmax) / s->channels); - int rc_floor = FFMAX(0, (s->nmr->rc_fill + rc_rate_frame - rc_bmax) / s->channels); - if (tot > rc_cap) - lam = nmr_solve(s, nd, nb, blo, bnc, NMR_STEP, act, nact, rc_cap, chosen, - lam, 1e4f, NMR_RC_ITERS); - else if (tot < rc_floor) - lam = nmr_solve(s, nd, nb, blo, bnc, NMR_STEP, act, nact, rc_floor, chosen, - 1e-9f, lam, NMR_RC_ITERS); - } +/* Bisect ONE shared lambda across the slots so the POOLED bits meet destbits. + * This is the CPE budget pool: bits flow to whichever channel of the pair has + * demand at the common operating point, instead of an equal per-channel split. */ +static float nmr_solve_slots(AACEncContext *s, NMRSlot *const *sl, int nsl, int step, + int destbits, float lo_l, float hi_l, int iters) +{ + float lam = 1.0f; + for (int it = 0; it < iters; it++) { + lam = sqrtf(lo_l * hi_l); + int total = nmr_eval_slots(s, sl, nsl, step, lam); + if (it == iters - 1) + break; + /* over budget -> go coarser */ + if (total > destbits) + lo_l = lam; + else + hi_l = lam; + } + return lam; +} - s->nmr->lam[s->cur_channel] = lam; /* warm start for the next frame */ - if (rc_global) { - /* drag the corridor centre toward the realized lambda so it follows - * content drift faster than the reservoir term alone */ - float c = s->nmr->lam_rc * powf(lam / s->nmr->lam_rc, NMR_RC_TRACK); - /* then servo the centre off the reservoir error so the long-run rate - * returns to nominal. rc_fill>0 = bits banked (undershooting) -> lower - * lambda to spend them; <0 -> raise it. This is what holds the mean; - * the corridor tracking alone has no rate authority and a bad centre - * would otherwise drift for dozens of frames, starving each one. */ - float R = avctx->bit_rate * 1024.0 / avctx->sample_rate; - c *= exp2f(-NMR_RC_K_CBR * s->nmr->rc_fill / R); - s->nmr->lam_rc = av_clipf(c, 1e-6f, 1e4f); - } else if (rc_eligible && nbnd >= 8) { - /* bootstrap the servo off the first substantive frame; near-silent - * lead-in frames have degenerate budgets that rail the bisection to - * a nonsense lambda and would poison the whole stream */ - s->nmr->lam_rc = av_clipf(lam, 1e-4f, 10.0f); +/* Write a solved slot back into its channel: band types, scalefactors, and the + * SCALE_MAX_DIFF legality fixups. Verbatim from the pre-pool single-channel tail. */ +static void nmr_commit_channel(AACEncContext *s, NMRSlot *t) +{ + SingleChannelElement *sce = t->sce; + const int (*nb)[NMR_NCAND] = (const int (*)[NMR_NCAND])s->nmr->nb[t->si]; + + for (int b = 0; b < t->nbnd; b++) { + int bi = t->bidx[b]; + if (t->is_pns[b]) { + sce->band_type[bi] = NOISE_BT; + sce->zeroes[bi] = 0; + sce->pns_ener[bi] = t->pener[bi] * FFMIN(1.0f, t->pspread[bi]*t->pspread[bi]); + } else { + sce->sf_idx[bi] = av_clip(t->blo[b] + t->chosen[b]*NMR_STEP, 0, SCALE_MAX_POS); } + } - { /* PNS */ - const float pns_lam = NMR_PNS_LAM; - /* band 0 (lowest freq) is kept as the global-gain / sf-chain anchor */ - for (int b = 1; b < nbnd; b++) { - int bi = bidx[b]; - float spread = pspread[bi]; - float nmr_pns, cost_keep, cost_pns, frac; - if (!sce->can_pns[bi]) - continue; - - /* Loud-band guard: never substitute a band whose energy is far above the - * masking threshold -- energy-matched noise on a dominant band clips/pops - * (and is audibly wrong). PNS is for near-masked noise only. */ - if (pener[bi] > NMR_PNS_MAX_ET * thr_real[bi]) - continue; - - /* Struggle gate: no PNS at all unless the encoder is genuinely under bit - * pressure (high operating lambda). */ - if (lam <= pns_lam) - continue; - - /* Spectral-hole fill: a noise-like band the trellis left mostly empty */ - frac = nd[b][chosen[b]] * thr[bi] / FFMAX(pener[bi], 1e-9f); - if (spread > NMR_PNS_HOLE_SPREAD && frac > NMR_PNS_HOLE_FRAC) { - is_pns[b] = 1; - pns_count++; - continue; - } - - /* Only replace a band that is being coded audibly badly */ - if (nd[b][chosen[b]] * thr[bi] <= NMR_PNS_NDGATE * thr_real[bi]) - continue; - /* perceptual cost of replacing the band with energy-matched noise: - * the non-noise-like fraction of its energy, in dist/threshold units */ - nmr_pns = FFMAX(0.0f, pener[bi] * (1.0f - spread*spread)) - / FFMAX(thr[bi], 1e-9f); - cost_keep = nd[b][chosen[b]] + lam * nb[b][chosen[b]]; - cost_pns = nmr_pns + lam * NMR_PNS_BITS; - if (cost_pns < cost_keep) { - is_pns[b] = 1; - pns_count++; - } - } - if (pns_count) { - int budget2 = destbits - pns_count * NMR_PNS_BITS; - nact = 0; - for (int b = 0; b < nbnd; b++) - if (!is_pns[b]) - act[nact++] = b; - /* re-solve over the survivors: at fixed lambda the allocation is - * the same except for the repaired sf-delta chain; in bisection - * mode re-spend the freed budget */ - if (rc_global) - nmr_solve(s, nd, nb, blo, bnc, NMR_STEP, act, nact, budget2, chosen, - lam, lam, 1); - else - nmr_solve(s, nd, nb, blo, bnc, NMR_STEP, act, nact, budget2, chosen, - 1e-9f, 1e4f, NMR_ITERS); - } - } - for (int b = 0; b < nbnd; b++) { - int bi = bidx[b]; - if (is_pns[b]) { - sce->band_type[bi] = NOISE_BT; - sce->zeroes[bi] = 0; - sce->pns_ener[bi] = pener[bi] * FFMIN(1.0f, pspread[bi]*pspread[bi]); - } else { - sce->sf_idx[bi] = av_clip(blo[b] + chosen[b]*NMR_STEP, 0, SCALE_MAX_POS); - } - } - - { /* record the bits this solve accounted for; the encoder compares them - * against the channel's real output to keep the budget honest */ - int tot = 0, prevb = -1; - for (int b = 0; b < nbnd; b++) { - if (is_pns[b]) - continue; - tot += nb[b][chosen[b]]; - if (prevb >= 0) - tot += NMR_SFBITS((blo[b]+chosen[b]*NMR_STEP) - (blo[prevb]+chosen[prevb]*NMR_STEP)); - prevb = b; - } - s->nmr->counted[s->cur_channel] = tot; + { /* record the bits this solve accounted for; the encoder compares them + * against the channel's real output to keep the budget honest */ + int tot = 0, prevb = -1; + for (int b = 0; b < t->nbnd; b++) { + if (t->is_pns[b]) + continue; + tot += nb[b][t->chosen[b]]; + if (prevb >= 0) + tot += NMR_SFBITS((t->blo[b]+t->chosen[b]*NMR_STEP) - (t->blo[prevb]+t->chosen[prevb]*NMR_STEP)); + prevb = b; } + s->nmr->counted[t->cur_ch] = tot; } /* SCALE_MAX_DIFF condition: @@ -645,7 +555,7 @@ static void search_for_quantizers_nmr(AVCodecContext *avctx, if (prev != -1) sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], prev - SCALE_MAX_DIFF, prev + SCALE_MAX_DIFF); - sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]); + sce->band_type[w*16+g] = find_min_book(t->maxvals[w*16+g], sce->sf_idx[w*16+g]); if (sce->band_type[w*16+g] <= 0) { if (!ff_sfdelta_can_remove_band(sce, nextband, prev, w*16+g)) { sce->band_type[w*16+g] = 1; @@ -663,11 +573,8 @@ static void search_for_quantizers_nmr(AVCodecContext *avctx, } } - /* Every band, coded or not, must carry a chain-legal scalefactor: the - * codebook trellis (encode_window_bands_info) may later absorb a dropped - * band into a nonzero section, resurrecting it, and its sf then gets - * coded. Forward-fill with the previous coded sf (delta 0, cheapest); - * leading bands get the global gain. */ + /* every band must carry a chain-legal scalefactor (re-clamp, codebook + * fixup, global gain) */ if (prev != -1) { int last = sce->sf_idx[0]; for (int w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { @@ -681,19 +588,414 @@ static void search_for_quantizers_nmr(AVCodecContext *avctx, } } } - return; +} -bail: - /* Nothing codeable in this channel. Leave a fully consistent state: any - * stale nonzero band_type acts as a codebook lower bound in the encoder's - * section trellis (encode_window_bands_info), which would forbid the zero - * section and resurrect the band with a stale, chain-illegal scalefactor. - * Pre-decided intensity bands keep their signalling. */ - for (int i = 0; i < 128; i++) { - if (sce->band_type[i] == INTENSITY_BT || sce->band_type[i] == INTENSITY_BT2) - continue; - sce->zeroes[i] = 1; - sce->band_type[i] = 0; +/* Solve one element group (a solo channel, or a CPE pair pooled under one + * shared lambda and one pooled budget), then PNS and commit. */ +static void nmr_solve_group(AVCodecContext *avctx, AACEncContext *s, + const float lambda, NMRSlot *const *sl, int nsl, + int chans, int rc_eligible, int rc_global, + int rc_rate_frame, int rc_bmax) +{ + const int cstep = NMR_COARSE > 0 ? NMR_COARSE : NMR_STEP; + int bch = ((avctx->flags & AV_CODEC_FLAG_QSCALE) ? 2.0f : avctx->ch_layout.nb_channels); + int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / bch * (lambda / 120.f) * chans; + int is8_any = 0; + float lam; + float rc_off = 1.0f, lam_dem = 0.0f; + + for (int k = 0; k < nsl; k++) + is8_any |= sl[k]->is8; + + if (s->psy.bitres.alloc >= 0) + destbits = s->psy.bitres.alloc * + (lambda / (avctx->global_quality ? avctx->global_quality : 120)) * chans; + if (rc_global && s->psy.bitres.alloc >= 0) { + /* CBR target: nominal + repayment, bounded +-30%/frame */ + double rr = avctx->bit_rate * 1024.0 / avctx->sample_rate; + destbits = (rr + av_clipd(s->nmr->rc_fill / 2.0, -0.3 * rr, 0.3 * rr)) * chans / s->channels; + } else if (rc_eligible && s->psy.bitres.alloc >= 0) { + /* pre-bootstrap CBR frames: target nominal (psy bitres is cold) */ + destbits = (avctx->bit_rate * 1024.0 / avctx->sample_rate) * chans / s->channels; + } + destbits = FFMIN(destbits, 5800 * chans); + /* honest budget: subtract the measured non-trellis overhead (section data, ICS, + * sf/PNS signalling), which is rate-dependent hence adaptive. */ + if (s->nmr->side_inited) + destbits = av_clip(destbits - (int)(s->nmr->side_ema * chans / s->channels), 64, 5800 * chans); + + /* Held transient burst, bank-aware: spend banked bits, never borrow deep + * (payback troughs starve the next transient). */ + if (s->nmr->run_burst > 1.0f) { + int extra = destbits * (s->nmr->run_burst - 1.0f); + int avail = FFMAX(0, (int)((s->nmr->rc_fill + rc_bmax / 2) * (int64_t)chans / s->channels)); + destbits = av_clip(destbits + FFMIN(extra, avail), 64, 6800 * chans); + } + + if (rc_global) { + /* corridor bisect around the servoed centre; pressure = stateless + * rc_off multiplier (folding it into lam_rc winds up) */ + float R = avctx->bit_rate * 1024.0 / avctx->sample_rate; + float cen; + int tot, hardcap, rc_cap; + float lo; + rc_off = exp2f(-NMR_RC_K_CBR * s->nmr->rc_fill / R); + cen = s->nmr->lam_rc * rc_off; + lo = cen / NMR_RC_CORR; + /* transient burst: widen the lower bound so the boosted destbits can + * actually pour into the onset frame */ + if (is8_any && s->nmr->run_burst > 1.0f) + lo /= s->nmr->run_burst; + lam = nmr_solve_slots(s, sl, nsl, cstep, destbits, + lo, cen * NMR_RC_CORR, NMR_RC_CITERS); + + tot = 0; + for (int k = 0; k < nsl; k++) + tot += nmr_slot_bits(sl[k], s->nmr->nb[sl[k]->si], cstep); + hardcap = av_clip((int)(5800.f * FFMIN(1.f, lambda / 120.f)), 256, 5800) * chans; + /* legality cap only; no spend-floor (rc_off spends the bank) */ + rc_cap = FFMIN(hardcap, (s->nmr->rc_fill + rc_rate_frame + rc_bmax) * chans / s->channels); + if (tot > rc_cap) { + lam = nmr_solve_slots(s, sl, nsl, cstep, rc_cap, lam, 1e4f, NMR_CITERS); + } + } else { + /* per-frame bisection, warm-started off the previous frame's lambda; + * a result at the bracket edge means redo the full search */ + float lam0 = s->nmr->lam[sl[0]->cur_ch]; + lam = 1.0f; + if (NMR_COARSE > 0 && lam0 > 0.0f) { + lam = nmr_solve_slots(s, sl, nsl, cstep, destbits, lam0/32.0f, lam0*32.0f, NMR_CWARM); + if (lam < lam0/16.0f || lam > lam0*16.0f) + lam0 = 0.0f; + } + if (lam0 <= 0.0f) + lam = nmr_solve_slots(s, sl, nsl, cstep, destbits, + 1e-9f, 1e4f, NMR_COARSE > 0 ? NMR_CITERS : NMR_ITERS); + } + + /* PASS 2: + * refine each band at full granularity (NMR_STEP) in a +/-cstep window + * around the coarse pick, then re-solve. Recovers single-pass quality while the + * lambda search stayed cheap on the coarse grid. */ + if (NMR_COARSE > 0) { + /* nmr_speed, 0 = slowest/best, higher = faster; see the option docs. */ + int win = NMR_COARSE - av_clip(s->options.nmr_speed, 0, 4); + for (int k = 0; k < nsl; k++) { + NMRSlot *t = sl[k]; + float (*ndk)[NMR_NCAND] = s->nmr->nd[t->si]; + int (*nbk)[NMR_NCAND] = s->nmr->nb[t->si]; + if (!t->nact) + continue; + /* the pow34 spectrum and the quantize cache are per-channel state */ + s->aacdsp.abs_pow34(s->scoefs, t->sce->coeffs, 1024); + ff_quantize_band_cost_cache_init(s); + for (int b = 0; b < t->nbnd; b++) { + int center = t->blo[b] + t->chosen[b]*cstep; + int flo = av_clip(center - win, av_clip(t->minsf[t->bidx[b]], 0, SCALE_MAX_POS), SCALE_MAX_POS); + int maxn = FFMIN(NMR_NCAND, 2*win/NMR_STEP + 1); + float invthr = 1.0f / FFMAX(t->thr[t->bidx[b]], 1e-9f); + int ncand = nmr_band_curve(s, t->sce, t->bw[b], t->bg[b], t->bst[b], flo, NMR_STEP, maxn, + invthr, t->maxvals[t->bidx[b]], ndk[b], nbk[b]); + if (t->tnsg[t->bidx[b]] > 1.0f) + for (int o = 0; o < ncand; o++) + ndk[b][o] *= t->tnsg[t->bidx[b]]; + t->blo[b] = flo; + t->bnc[b] = FFMAX(1, ncand); + } + } + /* fine pass: narrow corridor around the coarse solve */ + if (rc_global) + lam = nmr_solve_slots(s, sl, nsl, NMR_STEP, destbits, lam/2.0f, lam*2.0f, NMR_RC_FITERS); + else + lam = nmr_solve_slots(s, sl, nsl, NMR_STEP, destbits, lam/16.0f, lam*16.0f, NMR_IFINE); + } + + lam_dem = lam; /* demand-solved lambda, pre bucket clamp: what content wants */ + + if (rc_global) { + /* legality clamp, then the quality slew limiter */ + int hardcap = av_clip((int)(5800.f * FFMIN(1.f, lambda / 120.f)), 256, 5800) * chans; + int tot = 0, rc_cap; + for (int k = 0; k < nsl; k++) + tot += nmr_slot_bits(sl[k], s->nmr->nb[sl[k]->si], NMR_STEP); + rc_cap = FFMIN(hardcap, (s->nmr->rc_fill + rc_rate_frame + rc_bmax) * chans / s->channels); + if (tot > rc_cap) { + lam = nmr_solve_slots(s, sl, nsl, NMR_STEP, rc_cap, lam, 1e4f, NMR_RC_ITERS); + } + if (s->nmr->lam_slew > 0.0f) { + float kup, kdn; + /* hold lambda near-constant within short runs; bits follow content */ + kup = (is8_any && s->nmr->prev_was_short) ? NMR_SLEW_RUN : NMR_SLEW; + /* a deliberate onset burst may dive as far as its widened corridor + * allows; the RECOVERY back up is what must stay gradual */ + kdn = (is8_any && s->nmr->run_burst > 1.0f) ? NMR_SLEW * s->nmr->run_burst : + (is8_any && s->nmr->prev_was_short) ? NMR_SLEW_RUN : NMR_SLEW; + if (lam > s->nmr->lam_slew * kup || lam < s->nmr->lam_slew / kdn) { + lam = av_clipf(lam, s->nmr->lam_slew / kdn, s->nmr->lam_slew * kup); + tot = nmr_eval_slots(s, sl, nsl, NMR_STEP, lam); + /* never at the price of an illegal reservoir excursion */ + if (tot > rc_cap) { + lam = nmr_solve_slots(s, sl, nsl, NMR_STEP, rc_cap, lam, 1e4f, NMR_RC_ITERS); + } + } + } + s->nmr->lam_slew = lam; + } + + for (int k = 0; k < nsl; k++) + s->nmr->lam[sl[k]->cur_ch] = lam; /* warm start for the next frame */ + { /* nd: mean achieved dist/real-mask (dimensionless starvation + + * noise-class signal) */ + float ndsum = 0.0f; int ndn = 0; + for (int k = 0; k < nsl; k++) { + NMRSlot *t = sl[k]; + float (*ndk)[NMR_NCAND] = s->nmr->nd[t->si]; + for (int b_ = 0; b_ < t->nact; b_++) { + int b = t->act[b_], bi = t->bidx[b]; + if (t->thr_real[bi] > 0.0f && t->thr[bi] > 0.0f) { + ndsum += ndk[b][t->chosen[b]] * t->thr[bi] / t->thr_real[bi]; + ndn++; + } + } + } + /* long frames only (short groups inflate the ratio) */ + if (ndn >= 8 && !is8_any) { + float nd = ndsum / ndn; + s->nmr->nd_ema = s->nmr->nd_ema > 0.0f ? + 0.95f * s->nmr->nd_ema + 0.05f * nd : nd; + } + } + { /* track short vs long operating lambda (dense-beat boost scaling) */ + float *ema = is8_any ? &s->nmr->lam_short_ema : &s->nmr->lam_long_ema; + *ema = *ema > 0.0f ? 0.9f * *ema + 0.1f * lam : lam; + /* sustained-strain floor: snaps down at any comfortable moment, + * recovers only slowly, so bursty content cannot bank pressure + * credit between its lambda valleys. */ + s->nmr->lam_floor = s->nmr->lam_floor > 0.0f ? + fminf(s->nmr->lam_floor * 1.02f, lam) : lam; + } + { /* shared rate-pressure ramp: lambda vs nd-scaled anchors */ + float scale, ramp; + scale = 1.0f + av_clipf(s->nmr->nd_ema / 50.0f, 0.0f, 8.0f); + ramp = s->nmr->lam_long_ema > 0.0f ? + av_clipf((s->nmr->lam_long_ema - 120.0f * scale) / + (350.0f * scale - 120.0f * scale), 0.0f, 1.0f) : 0.0f; + /* transparency veto: lambda*nd below ~74 = comfortable */ + if (s->nmr->nd_ema > 0.0f) + ramp *= av_clipf((s->nmr->lam_long_ema * s->nmr->nd_ema - 60.0f) / + (120.0f - 60.0f), 0.0f, 1.0f); + s->nmr->press = ramp; + } + if (rc_global) { + /* track the centre toward the CONTENT lambda (demand-solved, pressure + * divided out); clamped lambda is rate noise, not content */ + float c = s->nmr->lam_rc * powf(lam_dem / rc_off / s->nmr->lam_rc, NMR_RC_TRACK); + s->nmr->lam_rc = av_clipf(c, 1e-6f, 1e4f); + } else if (rc_eligible) { + /* bootstrap the servo off the first substantive frame (silent lead-ins + * have degenerate budgets) */ + int nbnd_max = 0; + for (int k = 0; k < nsl; k++) + nbnd_max = FFMAX(nbnd_max, sl[k]->nbnd); + if (nbnd_max >= 8) { + s->nmr->lam_rc = av_clipf(lam, 1e-4f, 1e4f); + s->nmr->lam_slew = s->nmr->lam_rc; + } + } + + { /* PNS, per channel at the group's operating lambda */ + const float pns_lam = NMR_PNS_LAM; + int pns_total = 0; + for (int k = 0; k < nsl; k++) { + NMRSlot *t = sl[k]; + const float (*ndk)[NMR_NCAND] = (const float (*)[NMR_NCAND])s->nmr->nd[t->si]; + const int (*nbk)[NMR_NCAND] = (const int (*)[NMR_NCAND])s->nmr->nb[t->si]; + int pns_count = 0; + /* band 0 (lowest freq) is kept as the global-gain / sf-chain anchor */ + for (int b = 1; b < t->nbnd; b++) { + int bi = t->bidx[b]; + float spread = t->pspread[bi]; + float nmr_pns, cost_keep, cost_pns, frac; + if (!t->sce->can_pns[bi]) + continue; + + int was = s->nmr->pns_prev[t->cur_ch & 15][bi]; + float bias = was ? NMR_PNS_STAY : NMR_PNS_ENTER; + int want = 0, force_exit = 0; + + /* (can_pns was already checked above; gates below fill `want`) */ + if (t->pener[bi] > NMR_PNS_MAX_ET * t->thr_real[bi]) { + force_exit = 1; /* loud-band guard */ + } else if (lam > pns_lam) { + /* Spectral-hole fill: a noise-like band left mostly empty */ + frac = ndk[b][t->chosen[b]] * t->thr[bi] / FFMAX(t->pener[bi], 1e-9f); + if (spread > NMR_PNS_HOLE_SPREAD && + frac > NMR_PNS_HOLE_FRAC * (was ? 0.7f : 1.0f)) { + want = 1; + } else if (ndk[b][t->chosen[b]] * t->thr[bi] > + NMR_PNS_NDGATE * t->thr_real[bi] * (was ? 0.5f : 1.0f)) { + /* replace only a band coded audibly badly; cost of + * energy-matched noise = its non-noise-like fraction */ + nmr_pns = FFMAX(0.0f, t->pener[bi] * (1.0f - spread*spread)) + / FFMAX(t->thr[bi], 1e-9f); + cost_keep = ndk[b][t->chosen[b]] + lam * nbk[b][t->chosen[b]]; + cost_pns = nmr_pns + lam * NMR_PNS_BITS; + want = cost_pns < cost_keep * bias; + } + } + { /* debounce; near-mask deletion candidates skip entry + * (noise beats the ~silent rendition they'd get) */ + uint8_t *ron = &s->nmr->pns_run_on [t->cur_ch & 15][bi]; + uint8_t *roff = &s->nmr->pns_run_off[t->cur_ch & 15][bi]; + int near = t->pener[bi] < 2.0f * t->thr_real[bi]; + if (want) { if (*ron < 255) (*ron)++; *roff = 0; } + else { if (*roff < 255) (*roff)++; *ron = 0; } + if (force_exit) + want = 0; + else if (!was) + want = near ? want : *ron >= NMR_PNS_ON; + else if (near) + want = 1; /* physics-hysteresis: noise until audible */ + else + want = !(*roff >= NMR_PNS_OFF); + } + if (want) { + t->is_pns[b] = 1; + pns_count++; + } + } + if (pns_count) { + t->nact = 0; + for (int b = 0; b < t->nbnd; b++) + if (!t->is_pns[b]) + t->act[t->nact++] = b; + } + pns_total += pns_count; + } + if (pns_total) { + /* re-solve over the survivors: at fixed lambda the allocation is + * the same except for the repaired sf-delta chain; in bisection + * mode re-spend the freed budget */ + if (rc_global) + nmr_eval_slots(s, sl, nsl, NMR_STEP, lam); + else + nmr_solve_slots(s, sl, nsl, NMR_STEP, destbits - pns_total * NMR_PNS_BITS, + 1e-9f, 1e4f, NMR_ITERS); + } + } + + for (int k = 0; k < nsl; k++) { + NMRSlot *t = sl[k]; + uint8_t *pp = s->nmr->pns_prev[t->cur_ch & 15]; + uint8_t now[128] = {0}; + for (int b = 0; b < t->nbnd; b++) + if (t->is_pns[b]) + now[t->bidx[b]] = 1; + memcpy(pp, now, 128); + } + for (int k = 0; k < nsl; k++) + nmr_commit_channel(s, sl[k]); + +} + +static void search_for_quantizers_nmr(AVCodecContext *avctx, + AACEncContext *s, + SingleChannelElement *sce, + const float lambda) +{ + AACNMRCurves *n = s->nmr; + /* Global-lambda RC: one solve per frame at a servoed centre lambda; the reservoir + * holds the long-run mean rate. Bypassed for VBR (-q:a) and the bootstrap frame. */ + int rc_eligible = !(avctx->flags & AV_CODEC_FLAG_QSCALE) && avctx->bit_rate > 0 && + avctx->bit_rate_tolerance != 0; + /* Signed reservoir; soft steering (bounded repay + rc_off), hard cap = + * legality only. */ + int rc_rate_frame = avctx->bit_rate * 1024.0 / avctx->sample_rate; + int rc_bmax = FFMIN(FFMAX(6144 * s->channels - rc_rate_frame, 256), NMR_CBR_BUF * s->channels); + + int rc_global, defer; + NMRSlot *t; + + s->nmr->counted[s->cur_channel] = 0; + + if (rc_eligible && !n->rc_fill_seeded) { + /* the decoder bit reservoir starts FULL: seed it so the head may frontload */ + n->rc_fill = rc_bmax; + n->rc_fill_seeded = 1; + } + if (rc_eligible && avctx->frame_num != n->rc_frame_num) { + if (n->rc_frame_num > 0 && n->lam_rc > 0.0f) + n->rc_fill = av_clip(n->rc_fill + rc_rate_frame - s->last_frame_pb_count, + -rc_bmax, rc_bmax); + n->rc_frame_num = avctx->frame_num; + n->pending = 0; /* a deferred first channel never crosses a frame */ + /* latch the RC mode per frame: a mid-frame bootstrap must not flip + * the CPE defer logic between channels */ + n->rc_gl = rc_eligible && n->lam_rc > 0.0f; + + /* Transient burst run state: set at run start and held across the run so + * coding stays uniform; repaid from the reservoir's steady stretches. */ + int is_short = sce->ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE; + if (is_short) { + if (!n->prev_was_short) { /* run start */ + if (n->frames_since_short >= NMR_BURST_GAP) { + n->run_burst = NMR_BURST_GAIN; + } else { + /* dense-beat boost, scaled by measured short-frame starvation */ + float imb = 0.0f; + if (n->lam_long_ema > 0.0f && n->lam_short_ema > 0.0f) + imb = av_clipf(n->lam_short_ema / n->lam_long_ema - 1.0f, + 0.0f, 1.0f); + n->run_burst = 1.0f + (NMR_SHORT_BOOST - 1.0f) * imb * + n->frames_since_short / (float)NMR_BURST_GAP; + } + } + n->frames_since_short = 0; + } else { + /* the frame closing a run (the STOP) absorbs the corridor recoil + * of the boosted shorts; give it half the run's factor so the + * repayment spreads into the steady stretch instead */ + n->run_burst = n->prev_was_short ? sqrtf(n->run_burst) : 1.0f; + n->frames_since_short++; + } + n->prev_was_short = is_short; + } + rc_global = rc_eligible && n->rc_gl; + + /* CPE budget pool: under global-lambda RC, defer the pair's first channel + * and solve both against one pooled budget when the second one arrives. */ + defer = n->pair && rc_global; + + t = &n->slot[(defer && n->pending) ? 1 : 0]; + t->si = (defer && n->pending) ? 1 : 0; + + if (!nmr_setup_channel(avctx, s, sce, t)) { + nmr_bail_channel(sce); + t->nbnd = t->nact = 0; + } + + if (defer && !n->pending) { + n->pending = 1; /* wait for the partner channel */ + return; + } + + { + NMRSlot *sl[2]; + int nsl = 0, chans = 1; + if (defer) { + n->pending = 0; + chans = 2; + if (n->slot[0].nact) + sl[nsl++] = &n->slot[0]; + if (n->slot[1].nact) + sl[nsl++] = &n->slot[1]; + } else if (t->nact) { + sl[nsl++] = t; + } + if (!nsl) + return; /* nothing codeable in the group */ + nmr_solve_group(avctx, s, lambda, sl, nsl, chans, + rc_eligible, rc_global, rc_rate_frame, rc_bmax); } } diff --git a/libavcodec/aacenc.h b/libavcodec/aacenc.h index 67069cbdf1..ec04465a6d 100644 --- a/libavcodec/aacenc.h +++ b/libavcodec/aacenc.h @@ -173,9 +173,57 @@ typedef struct AACQuantizeBandCostCacheEntry { /** * NMR coder per-band candidate cost curves (~96 KiB) and rate-control carry-over */ +/** + * Per-channel trellis state for one solve. A channel pair (CPE) is solved + * jointly against a pooled budget: the first channel's setup is stored here + * and committed together with the second channel under one shared lambda. + */ +typedef struct NMRSlot { + struct SingleChannelElement *sce; + int si; ///< curve-bank index (nd/nb slot) + int cur_ch; ///< encoder channel index (psy/cache context) + int nbnd; ///< coded-band count, 0 = nothing codeable + int is8; ///< EIGHT_SHORT frame + int bidx[128]; ///< sce band index (w*16+g) + int bw[128], bg[128], bst[128]; ///< window group, swb, coef start + int blo[128]; ///< finest candidate scalefactor + int bnc[128]; ///< number of candidates + int chosen[128]; + int act[128]; ///< active (non-PNS) band coding order + int nact; + int minsf[128]; + float maxvals[128]; + float thr[128]; ///< allocation-law effective threshold + float thr_real[128]; ///< real masking threshold (PNS gates) + float tnsg[128]; ///< TNS synthesis gain per band for THIS solve (1 = uncovered), M/S-aware (pair max) + float pener[128]; ///< band energy (PNS noise target) + float pspread[128]; ///< band tonality spread (1 = noise) + uint8_t is_pns[128]; ///< band coded as noise +} NMRSlot; + typedef struct AACNMRCurves { - float nd[128][NMR_NCAND]; ///< dist / threshold per candidate - int nb[128][NMR_NCAND]; ///< spectral bits per candidate + float nd[2][128][NMR_NCAND]; ///< dist / threshold per candidate, per pair slot + int nb[2][128][NMR_NCAND]; ///< spectral bits per candidate, per pair slot + NMRSlot slot[2]; ///< pair slots (solo solves use slot 0) + int pair; ///< current element is a CPE: pool the pair budget + int rc_gl; ///< rc_global latched at frame start: the corridor bootstrap must not flip the CPE defer logic between channels of one frame + int rc_fill_seeded; ///< reservoir seeded full at stream start (decoder buffer starts full) + int pending; ///< slot 0 holds a deferred first channel + uint8_t zero_prev[16][128]; ///< per-channel band zero state last frame (zeroing hysteresis) + int zero_nw[16]; ///< window count zero_prev was recorded on + float thr_prev[16][64]; ///< per-channel long-grid law thresholds of the previous frame + uint8_t thr_prev_ok[16]; ///< thr_prev holds a long-frame measurement + uint8_t pns_prev[16][128]; ///< per-channel PNS state last frame (decision hysteresis) + uint8_t pns_run_on[16][128]; ///< consecutive frames the band has WANTED PNS + uint8_t pns_run_off[16][128]; ///< consecutive frames the band has wanted OUT + uint8_t smode[16][128]; ///< per-pair previous stereo mode per band, two banks per pair (long/short grid): each grid's memory persists across the other's frames instead of being wiped at window switches + uint8_t smode_band[8][128]; ///< last decided stereo mode per band index (side-band tests) + uint8_t tns8_prev[16]; ///< short-TNS accepted last frame (per channel): Schmitt state for the accept bar + uint8_t sinit[16]; ///< stereo state bank initialized + int smode_nw[8]; ///< window count the stored modes were decided on + float sema_es[16][128]; ///< smoothed side energy per band (stereo-decision EMA) + float sema_em[16][128]; ///< smoothed mid energy per band + float sema_img[16][128]; ///< smoothed I/S image-error/mask ratio per band float lam[16]; ///< per-channel operating lambda of the previous frame, 0 = none yet int counted[16]; ///< per-channel bits the trellis accounted for in the last solve float side_ema; ///< running estimate of real-minus-counted bits per frame @@ -187,6 +235,12 @@ typedef struct AACNMRCurves { int frames_since_short; ///< long-block frames since the last short run (the "gap"): large = isolated transient int prev_was_short; ///< previous frame was a short block (for run-start detection) float run_burst; ///< transient bit-burst factor, set at run start and held across the short run + float lam_slew; ///< final operating lambda of the previous RC frame (slew-limiter state) + float nd_ema; ///< smoothed achieved distortion/real-mask over long-frame coded bands (1 = at threshold; >>1 flags psy-unreliable noise-class content) + float press; ///< rate-pressure ramp [0,1]: lambda EMA against anchors that scale up when nd_ema flags noise-class content (psy masks unreliable there, lambda reads inflated) + float lam_short_ema; ///< smoothed operating lambda of short frames + float lam_long_ema; ///< smoothed operating lambda of long frames + float lam_floor; ///< lambda min-tracker (snaps down, +2%/frame up): sustained-strain floor; bursty spikes at a comfortable rate cannot raise it } AACNMRCurves; typedef struct AACPCEInfo { diff --git a/tests/ref/fate/id3v2-reenc-delete-metadata b/tests/ref/fate/id3v2-reenc-delete-metadata index 608d7fe7e4..a9ec6cec02 100644 --- a/tests/ref/fate/id3v2-reenc-delete-metadata +++ b/tests/ref/fate/id3v2-reenc-delete-metadata @@ -1,5 +1,5 @@ -31f137d9ea26baee95f75083ac87f60a *tests/data/fate/id3v2-reenc-delete-metadata.nut -2396 tests/data/fate/id3v2-reenc-delete-metadata.nut +d870ccc9affa856943d6bce9fec4451f *tests/data/fate/id3v2-reenc-delete-metadata.nut +2956 tests/data/fate/id3v2-reenc-delete-metadata.nut [FORMAT] TAG:title=7rk [/FORMAT] diff --git a/tests/ref/fate/id3v2-reenc-delete-metadata-keep b/tests/ref/fate/id3v2-reenc-delete-metadata-keep index c1562da559..1476c029b2 100644 --- a/tests/ref/fate/id3v2-reenc-delete-metadata-keep +++ b/tests/ref/fate/id3v2-reenc-delete-metadata-keep @@ -1,5 +1,5 @@ -805cef2308c41ebbf8e772f166aafe2e *tests/data/fate/id3v2-reenc-delete-metadata-keep.nut -2524 tests/data/fate/id3v2-reenc-delete-metadata-keep.nut +d3f8b96016d742eece05c82f1dace17d *tests/data/fate/id3v2-reenc-delete-metadata-keep.nut +3084 tests/data/fate/id3v2-reenc-delete-metadata-keep.nut [FORMAT] TAG:title=7rk TAG:iTunSMPB= 00000000 00000210 0000086A 0000000000066486 00000000 0002DA9D 00000000 00000000 00000000 00000000 00000000 00000000 diff --git a/tests/ref/fate/id3v2-reenc-delete-metadata-keep-format b/tests/ref/fate/id3v2-reenc-delete-metadata-keep-format index d8acf33159..92c6fd3548 100644 --- a/tests/ref/fate/id3v2-reenc-delete-metadata-keep-format +++ b/tests/ref/fate/id3v2-reenc-delete-metadata-keep-format @@ -1,5 +1,5 @@ -805cef2308c41ebbf8e772f166aafe2e *tests/data/fate/id3v2-reenc-delete-metadata-keep-format.nut -2524 tests/data/fate/id3v2-reenc-delete-metadata-keep-format.nut +d3f8b96016d742eece05c82f1dace17d *tests/data/fate/id3v2-reenc-delete-metadata-keep-format.nut +3084 tests/data/fate/id3v2-reenc-delete-metadata-keep-format.nut [FORMAT] TAG:title=7rk TAG:iTunSMPB= 00000000 00000210 0000086A 0000000000066486 00000000 0002DA9D 00000000 00000000 00000000 00000000 00000000 00000000 diff --git a/tests/ref/fate/id3v2-reenc-delete-metadata-keep-stream b/tests/ref/fate/id3v2-reenc-delete-metadata-keep-stream index 02827345a3..1b120f7c58 100644 --- a/tests/ref/fate/id3v2-reenc-delete-metadata-keep-stream +++ b/tests/ref/fate/id3v2-reenc-delete-metadata-keep-stream @@ -1,5 +1,5 @@ -31f137d9ea26baee95f75083ac87f60a *tests/data/fate/id3v2-reenc-delete-metadata-keep-stream.nut -2396 tests/data/fate/id3v2-reenc-delete-metadata-keep-stream.nut +d870ccc9affa856943d6bce9fec4451f *tests/data/fate/id3v2-reenc-delete-metadata-keep-stream.nut +2956 tests/data/fate/id3v2-reenc-delete-metadata-keep-stream.nut [FORMAT] TAG:title=7rk [/FORMAT] diff --git a/tests/ref/fate/id3v2-reenc-delete-metadata-map-metadata b/tests/ref/fate/id3v2-reenc-delete-metadata-map-metadata index ec640b7b55..bde3194636 100644 --- a/tests/ref/fate/id3v2-reenc-delete-metadata-map-metadata +++ b/tests/ref/fate/id3v2-reenc-delete-metadata-map-metadata @@ -1,5 +1,5 @@ -31f137d9ea26baee95f75083ac87f60a *tests/data/fate/id3v2-reenc-delete-metadata-map-metadata.nut -2396 tests/data/fate/id3v2-reenc-delete-metadata-map-metadata.nut +d870ccc9affa856943d6bce9fec4451f *tests/data/fate/id3v2-reenc-delete-metadata-map-metadata.nut +2956 tests/data/fate/id3v2-reenc-delete-metadata-map-metadata.nut [FORMAT] TAG:title=7rk [/FORMAT] _______________________________________________ ffmpeg-cvslog mailing list -- [email protected] To unsubscribe send an email to [email protected]
