/** * Calculate rate distortion cost for quantizing with given codebook * * @return quantization distortion */ static float quantize_and_encode_band_cost(struct AACEncContext *s, PutBitContext *pb, const float *in, const float *scaled, int size, int scale_idx, int cb, const float lambda, const float uplim, int *bits) { const float IQ = ff_aac_pow2sf_tab[200 + scale_idx - SCALE_ONE_POS + SCALE_DIV_512]; const float Q = ff_aac_pow2sf_tab[200 - scale_idx + SCALE_ONE_POS - SCALE_DIV_512]; const float CLIPPED_ESCAPE = 165140.0f*IQ; int i, j, k; float cost = 0; const int dim = cb < FIRST_PAIR_BT ? 4 : 2; int resbits = 0; #ifndef USE_REALLY_FULL_SEARCH const float Q34 = sqrtf(Q * sqrtf(Q)); const int range = aac_cb_range[cb]; const int maxval = aac_cb_maxval[cb]; int offs[4]; #endif /* USE_REALLY_FULL_SEARCH */ if (!cb) { for (i = 0; i < size; i++) cost += in[i]*in[i]; if (bits) *bits = 0; return cost * lambda; } #ifndef USE_REALLY_FULL_SEARCH offs[0] = 1; for (i = 1; i < dim; i++) offs[i] = offs[i-1]*range; if (!scaled) { abs_pow34_v(s->scoefs, in, size); scaled = s->scoefs; } quantize_bands(s->qcoefs, in, scaled, size, Q34, !IS_CODEBOOK_UNSIGNED(cb), maxval); #endif /* USE_REALLY_FULL_SEARCH */ for (i = 0; i < size; i += dim) { float mincost; int minidx = 0; int minbits = 0; const float *vec; #ifndef USE_REALLY_FULL_SEARCH int (*quants)[2] = &s->qcoefs[i]; mincost = 0.0f; for (j = 0; j < dim; j++) mincost += in[i+j]*in[i+j]; minidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40; minbits = ff_aac_spectral_bits[cb-1][minidx]; mincost = mincost * lambda + minbits; for (j = 0; j < (1<<dim); j++) { float rd = 0.0f; int curbits; int curidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40; int same = 0; for (k = 0; k < dim; k++) { if ((j & (1 << k)) && quants[k][0] == quants[k][1]) { same = 1; break; } } if (same) continue; for (k = 0; k < dim; k++) curidx += quants[k][!!(j & (1 << k))] * offs[dim - 1 - k]; curbits = ff_aac_spectral_bits[cb-1][curidx]; vec = &ff_aac_codebook_vectors[cb-1][curidx*dim]; #else mincost = INFINITY; vec = ff_aac_codebook_vectors[cb-1]; for (j = 0; j < ff_aac_spectral_sizes[cb-1]; j++, vec += dim) { float rd = 0.0f; int curbits = ff_aac_spectral_bits[cb-1][j]; int curidx = j; #endif /* USE_REALLY_FULL_SEARCH */ if (IS_CODEBOOK_UNSIGNED(cb)) { for (k = 0; k < dim; k++) { float t = fabsf(in[i+k]); float di; if (vec[k] == 64.0f) { //FIXME: slow //do not code with escape sequence small values if (t < 39.0f*IQ) { rd = INFINITY; break; } if (t >= CLIPPED_ESCAPE) { di = t - CLIPPED_ESCAPE; curbits += 21; } else { int c = av_clip(quant(t, Q), 0, 8191); di = t - c*cbrtf(c)*IQ; curbits += av_log2(c)*2 - 4 + 1; } } else { di = t - vec[k]*IQ; } if (vec[k] != 0.0f) curbits++; rd += di*di; } } else { for (k = 0; k < dim; k++) { float di = in[i+k] - vec[k]*IQ; rd += di*di; } } rd = rd * lambda + curbits; if (rd < mincost) { mincost = rd; minidx = curidx; minbits = curbits; } } cost += mincost; resbits += minbits; if (cost >= uplim) return uplim; if (pb) { put_bits(pb, ff_aac_spectral_bits[cb-1][minidx], ff_aac_spectral_codes[cb-1][minidx]); if (IS_CODEBOOK_UNSIGNED(cb)) for (j = 0; j < dim; j++) if (ff_aac_codebook_vectors[cb-1][minidx*dim+j] != 0.0f) put_bits(pb, 1, in[i+j] < 0.0f); if (cb == ESC_BT) { for (j = 0; j < 2; j++) { if (ff_aac_codebook_vectors[cb-1][minidx*2+j] == 64.0f) { int coef = av_clip(quant(fabsf(in[i+j]), Q), 0, 8191); int len = av_log2(coef); put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2); put_bits(pb, len, coef & ((1 << len) - 1)); } } } } } if (bits) *bits = resbits; return cost; } static float quantize_band_cost(struct AACEncContext *s, const float *in, const float *scaled, int size, int scale_idx, int cb, const float lambda, const float uplim, int *bits) { return quantize_and_encode_band_cost(s, NULL, in, scaled, size, scale_idx, cb, lambda, uplim, bits); } static void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb, const float *in, int size, int scale_idx, int cb, const float lambda) { quantize_and_encode_band_cost(s, pb, in, NULL, size, scale_idx, cb, lambda, INFINITY, NULL); }
/** * Calculate rate distortion cost for quantizing with given codebook * * @return quantization distortion */ static av_always_inline float quantize_and_encode_band_cost_template( struct AACEncContext *s, PutBitContext *pb, const float *in, const float *scaled, int size, int scale_idx, int cb, const float lambda, const float uplim, int *bits, int BT_ZERO, int BT_UNSIGNED, int BT_PAIR, int BT_ESC) { const float IQ = ff_aac_pow2sf_tab[POW_SF2_ZERO + scale_idx - SCALE_ONE_POS + SCALE_DIV_512]; const float Q = ff_aac_pow2sf_tab[POW_SF2_ZERO - scale_idx + SCALE_ONE_POS - SCALE_DIV_512]; const float CLIPPED_ESCAPE = 165140.0f*IQ; int i, j; float cost = 0; const int dim = BT_PAIR ? 2 : 4; int resbits = 0; const float Q34 = sqrtf(Q * sqrtf(Q)); const int range = aac_cb_range[cb]; const int maxval = aac_cb_maxval[cb]; int off; if (BT_ZERO) { for (i = 0; i < size; i++) cost += in[i]*in[i]; if (bits) *bits = 0; return cost * lambda; } if (!scaled) { abs_pow34_v(s->scoefs, in, size); scaled = s->scoefs; } quantize_bands(s->qcoefs, in, scaled, size, Q34, !BT_UNSIGNED, maxval); if (BT_UNSIGNED) { off = 0; } else { off = maxval; } for (i = 0; i < size; i += dim) { const float *vec; int *quants = s->qcoefs + i; int curidx = 0; int curbits; float rd = 0.0f; for (j = 0; j < dim; j++) { curidx *= range; curidx += quants[j] + off; } curbits = ff_aac_spectral_bits[cb-1][curidx]; vec = &ff_aac_codebook_vectors[cb-1][curidx*dim]; if (BT_UNSIGNED) { for (j = 0; j < dim; j++) { float t = fabsf(in[i+j]); float di; if (BT_ESC && vec[j] == 64.0f) { //FIXME: slow if (t >= CLIPPED_ESCAPE) { di = t - CLIPPED_ESCAPE; curbits += 21; } else { int c = av_clip(quant(t, Q), 0, 8191); di = t - c*cbrtf(c)*IQ; curbits += av_log2(c)*2 - 4 + 1; } } else { di = t - vec[j]*IQ; } if (vec[j] != 0.0f) curbits++; rd += di*di; } } else { for (j = 0; j < dim; j++) { float di = in[i+j] - vec[j]*IQ; rd += di*di; } } cost += rd * lambda + curbits; resbits += curbits; if (cost >= uplim) return uplim; if (pb) { put_bits(pb, ff_aac_spectral_bits[cb-1][curidx], ff_aac_spectral_codes[cb-1][curidx]); if (BT_UNSIGNED) for (j = 0; j < dim; j++) if (ff_aac_codebook_vectors[cb-1][curidx*dim+j] != 0.0f) put_bits(pb, 1, in[i+j] < 0.0f); if (BT_ESC) { for (j = 0; j < 2; j++) { if (ff_aac_codebook_vectors[cb-1][curidx*2+j] == 64.0f) { int coef = av_clip(quant(fabsf(in[i+j]), Q), 0, 8191); int len = av_log2(coef); put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2); put_bits(pb, len, coef & ((1 << len) - 1)); } } } } } if (bits) *bits = resbits; return cost; }
/** * Calculate rate distortion cost for quantizing with given codebook * * @return quantization distortion */ static float quantize_band_cost(struct AACEncContext *s, const float *in, const float *scaled, int size, int scale_idx, int cb, const float lambda, const float uplim, int *bits) { const float IQ = ff_aac_pow2sf_tab[200 + scale_idx - SCALE_ONE_POS + SCALE_DIV_512]; const float Q = ff_aac_pow2sf_tab[200 - scale_idx + SCALE_ONE_POS - SCALE_DIV_512]; const float CLIPPED_ESCAPE = 165140.0f*IQ; int i, j, k; float cost = 0; const int dim = cb < FIRST_PAIR_BT ? 4 : 2; int resbits = 0; #ifndef USE_REALLY_FULL_SEARCH const float Q34 = sqrtf(Q * sqrtf(Q)); const int range = aac_cb_range[cb]; const int maxval = aac_cb_maxval[cb]; int offs[4]; #endif /* USE_REALLY_FULL_SEARCH */ if (!cb) { for (i = 0; i < size; i++) cost += in[i]*in[i]; if (bits) *bits = 0; return cost * lambda; } #ifndef USE_REALLY_FULL_SEARCH offs[0] = 1; for (i = 1; i < dim; i++) offs[i] = offs[i-1]*range; quantize_bands(s->qcoefs, in, scaled, size, Q34, !IS_CODEBOOK_UNSIGNED(cb), maxval); #endif /* USE_REALLY_FULL_SEARCH */ for (i = 0; i < size; i += dim) { float mincost; int minidx = 0; int minbits = 0; const float *vec; #ifndef USE_REALLY_FULL_SEARCH int (*quants)[2] = &s->qcoefs[i]; mincost = 0.0f; for (j = 0; j < dim; j++) mincost += in[i+j]*in[i+j]; minidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40; minbits = ff_aac_spectral_bits[cb-1][minidx]; mincost = mincost * lambda + minbits; for (j = 0; j < (1<<dim); j++) { float rd = 0.0f; int curbits; int curidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40; int same = 0; for (k = 0; k < dim; k++) { if ((j & (1 << k)) && quants[k][0] == quants[k][1]) { same = 1; break; } } if (same) continue; for (k = 0; k < dim; k++) curidx += quants[k][!!(j & (1 << k))] * offs[dim - 1 - k]; curbits = ff_aac_spectral_bits[cb-1][curidx]; vec = &ff_aac_codebook_vectors[cb-1][curidx*dim]; #else mincost = INFINITY; vec = ff_aac_codebook_vectors[cb-1]; for (j = 0; j < ff_aac_spectral_sizes[cb-1]; j++, vec += dim) { float rd = 0.0f; int curbits = ff_aac_spectral_bits[cb-1][j]; #endif /* USE_REALLY_FULL_SEARCH */ if (IS_CODEBOOK_UNSIGNED(cb)) { for (k = 0; k < dim; k++) { float t = fabsf(in[i+k]); float di; if (vec[k] == 64.0f) { //FIXME: slow //do not code with escape sequence small values if (t < 39.0f*IQ) { rd = INFINITY; break; } if (t >= CLIPPED_ESCAPE) { di = t - CLIPPED_ESCAPE; curbits += 21; } else { int c = av_clip(quant(t, Q), 0, 8191); di = t - c*cbrtf(c)*IQ; curbits += av_log2(c)*2 - 4 + 1; } } else { di = t - vec[k]*IQ; } if (vec[k] != 0.0f) curbits++; rd += di*di; } } else { for (k = 0; k < dim; k++) { float di = in[i+k] - vec[k]*IQ; rd += di*di; } } rd = rd * lambda + curbits; if (rd < mincost) { mincost = rd; minidx = j; minbits = curbits; } } cost += mincost; resbits += minbits; if (cost >= uplim) return uplim; } if (bits) *bits = resbits; return cost; } static void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb, const float *in, int size, int scale_idx, int cb, const float lambda) { const float IQ = ff_aac_pow2sf_tab[200 + scale_idx - SCALE_ONE_POS + SCALE_DIV_512]; const float Q = ff_aac_pow2sf_tab[200 - scale_idx + SCALE_ONE_POS - SCALE_DIV_512]; const float CLIPPED_ESCAPE = 165140.0f*IQ; const int dim = (cb < FIRST_PAIR_BT) ? 4 : 2; int i, j, k; #ifndef USE_REALLY_FULL_SEARCH const float Q34 = sqrtf(Q * sqrtf(Q)); const int range = aac_cb_range[cb]; const int maxval = aac_cb_maxval[cb]; int offs[4]; float *scaled = s->scoefs; #endif /* USE_REALLY_FULL_SEARCH */ //START_TIMER if (!cb) return; #ifndef USE_REALLY_FULL_SEARCH offs[0] = 1; for (i = 1; i < dim; i++) offs[i] = offs[i-1]*range; abs_pow34_v(scaled, in, size); quantize_bands(s->qcoefs, in, scaled, size, Q34, !IS_CODEBOOK_UNSIGNED(cb), maxval); #endif /* USE_REALLY_FULL_SEARCH */ for (i = 0; i < size; i += dim) { float mincost; int minidx = 0; int minbits = 0; const float *vec; #ifndef USE_REALLY_FULL_SEARCH int (*quants)[2] = &s->qcoefs[i]; mincost = 0.0f; for (j = 0; j < dim; j++) mincost += in[i+j]*in[i+j]; minidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40; minbits = ff_aac_spectral_bits[cb-1][minidx]; mincost = mincost * lambda + minbits; for (j = 0; j < (1<<dim); j++) { float rd = 0.0f; int curbits; int curidx = IS_CODEBOOK_UNSIGNED(cb) ? 0 : 40; int same = 0; for (k = 0; k < dim; k++) { if ((j & (1 << k)) && quants[k][0] == quants[k][1]) { same = 1; break; } } if (same) continue; for (k = 0; k < dim; k++) curidx += quants[k][!!(j & (1 << k))] * offs[dim - 1 - k]; curbits = ff_aac_spectral_bits[cb-1][curidx]; vec = &ff_aac_codebook_vectors[cb-1][curidx*dim]; #else vec = ff_aac_codebook_vectors[cb-1]; mincost = INFINITY; for (j = 0; j < ff_aac_spectral_sizes[cb-1]; j++, vec += dim) { float rd = 0.0f; int curbits = ff_aac_spectral_bits[cb-1][j]; int curidx = j; #endif /* USE_REALLY_FULL_SEARCH */ if (IS_CODEBOOK_UNSIGNED(cb)) { for (k = 0; k < dim; k++) { float t = fabsf(in[i+k]); float di; if (vec[k] == 64.0f) { //FIXME: slow //do not code with escape sequence small values if (t < 39.0f*IQ) { rd = INFINITY; break; } if (t >= CLIPPED_ESCAPE) { di = t - CLIPPED_ESCAPE; curbits += 21; } else { int c = av_clip(quant(t, Q), 0, 8191); di = t - c*cbrtf(c)*IQ; curbits += av_log2(c)*2 - 4 + 1; } } else { di = t - vec[k]*IQ; } if (vec[k] != 0.0f) curbits++; rd += di*di; } } else { for (k = 0; k < dim; k++) { float di = in[i+k] - vec[k]*IQ; rd += di*di; } } rd = rd * lambda + curbits; if (rd < mincost) { mincost = rd; minidx = curidx; minbits = curbits; } } put_bits(pb, ff_aac_spectral_bits[cb-1][minidx], ff_aac_spectral_codes[cb-1][minidx]); if (IS_CODEBOOK_UNSIGNED(cb)) for (j = 0; j < dim; j++) if (ff_aac_codebook_vectors[cb-1][minidx*dim+j] != 0.0f) put_bits(pb, 1, in[i+j] < 0.0f); if (cb == ESC_BT) { for (j = 0; j < 2; j++) { if (ff_aac_codebook_vectors[cb-1][minidx*2+j] == 64.0f) { int coef = av_clip(quant(fabsf(in[i+j]), Q), 0, 8191); int len = av_log2(coef); put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2); put_bits(pb, len, coef & ((1 << len) - 1)); } } } } //STOP_TIMER("quantize_and_encode") } /** * structure used in optimal codebook search */ typedef struct BandCodingPath { int prev_idx; ///< pointer to the previous path point float cost; ///< path cost int run; } BandCodingPath; /** * Encode band info for single window group bands. */ static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce, int win, int group_len, const float lambda) { BandCodingPath path[120][12]; int w, swb, cb, start, start2, size; int i, j; const int max_sfb = sce->ics.max_sfb; const int run_bits = sce->ics.num_windows == 1 ? 5 : 3; const int run_esc = (1 << run_bits) - 1; int idx, ppos, count; int stackrun[120], stackcb[120], stack_len; float next_minrd = INFINITY; int next_mincb = 0; abs_pow34_v(s->scoefs, sce->coeffs, 1024); start = win*128; for (cb = 0; cb < 12; cb++) { path[0][cb].cost = 0.0f; path[0][cb].prev_idx = -1; path[0][cb].run = 0; } for (swb = 0; swb < max_sfb; swb++) { start2 = start; size = sce->ics.swb_sizes[swb]; if (sce->zeroes[win*16 + swb]) { for (cb = 0; cb < 12; cb++) { path[swb+1][cb].prev_idx = cb; path[swb+1][cb].cost = path[swb][cb].cost; path[swb+1][cb].run = path[swb][cb].run + 1; } } else { float minrd = next_minrd; int mincb = next_mincb; next_minrd = INFINITY; next_mincb = 0; for (cb = 0; cb < 12; cb++) { float cost_stay_here, cost_get_here; float rd = 0.0f; for (w = 0; w < group_len; w++) { FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(win+w)*16+swb]; rd += quantize_band_cost(s, sce->coeffs + start + w*128, s->scoefs + start + w*128, size, sce->sf_idx[(win+w)*16+swb], cb, lambda / band->threshold, INFINITY, NULL); } cost_stay_here = path[swb][cb].cost + rd; cost_get_here = minrd + rd + run_bits + 4; if ( run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run] != run_value_bits[sce->ics.num_windows == 8][path[swb][cb].run+1]) cost_stay_here += run_bits; if (cost_get_here < cost_stay_here) { path[swb+1][cb].prev_idx = mincb; path[swb+1][cb].cost = cost_get_here; path[swb+1][cb].run = 1; } else { path[swb+1][cb].prev_idx = cb; path[swb+1][cb].cost = cost_stay_here; path[swb+1][cb].run = path[swb][cb].run + 1; } if (path[swb+1][cb].cost < next_minrd) { next_minrd = path[swb+1][cb].cost; next_mincb = cb; } } } start += sce->ics.swb_sizes[swb]; } //convert resulting path from backward-linked list stack_len = 0; idx = 0; for (cb = 1; cb < 12; cb++) if (path[max_sfb][cb].cost < path[max_sfb][idx].cost) idx = cb; ppos = max_sfb; while (ppos > 0) { cb = idx; stackrun[stack_len] = path[ppos][cb].run; stackcb [stack_len] = cb; idx = path[ppos-path[ppos][cb].run+1][cb].prev_idx; ppos -= path[ppos][cb].run; stack_len++; } //perform actual band info encoding start = 0; for (i = stack_len - 1; i >= 0; i--) { put_bits(&s->pb, 4, stackcb[i]); count = stackrun[i]; memset(sce->zeroes + win*16 + start, !stackcb[i], count); //XXX: memset when band_type is also uint8_t for (j = 0; j < count; j++) { sce->band_type[win*16 + start] = stackcb[i]; start++; } while (count >= run_esc) { put_bits(&s->pb, run_bits, run_esc); count -= run_esc; } put_bits(&s->pb, run_bits, count); } } typedef struct TrellisPath { float cost; int prev; int min_val; int max_val; } TrellisPath; #define TRELLIS_STAGES 121 #define TRELLIS_STATES 256 static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda) { int q, w, w2, g, start = 0; int i, j; int idx; TrellisPath paths[TRELLIS_STAGES][TRELLIS_STATES]; int bandaddr[TRELLIS_STAGES]; int minq; float mincost; for (i = 0; i < TRELLIS_STATES; i++) { paths[0][i].cost = 0.0f; paths[0][i].prev = -1; paths[0][i].min_val = i; paths[0][i].max_val = i; } for (j = 1; j < TRELLIS_STAGES; j++) { for (i = 0; i < TRELLIS_STATES; i++) { paths[j][i].cost = INFINITY; paths[j][i].prev = -2; paths[j][i].min_val = INT_MAX; paths[j][i].max_val = 0; } } idx = 1; abs_pow34_v(s->scoefs, sce->coeffs, 1024); 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; float qmin, qmax; int nz = 0; bandaddr[idx] = w * 16 + g; qmin = INT_MAX; qmax = 0.0f; for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g]; if (band->energy <= band->threshold || band->threshold == 0.0f) { sce->zeroes[(w+w2)*16+g] = 1; continue; } sce->zeroes[(w+w2)*16+g] = 0; nz = 1; for (i = 0; i < sce->ics.swb_sizes[g]; i++) { float t = fabsf(coefs[w2*128+i]); if (t > 0.0f) qmin = FFMIN(qmin, t); qmax = FFMAX(qmax, t); } } if (nz) { int minscale, maxscale; float minrd = INFINITY; //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped minscale = av_clip_uint8(log2(qmin)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512); //maximum scalefactor index is when maximum coefficient after quantizing is still not zero maxscale = av_clip_uint8(log2(qmax)*4 + 6 + SCALE_ONE_POS - SCALE_DIV_512); for (q = minscale; q < maxscale; q++) { float dists[12], dist; memset(dists, 0, sizeof(dists)); for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { FFPsyBand *band = &s->psy.psy_bands[s->cur_channel*PSY_MAX_BANDS+(w+w2)*16+g]; int cb; for (cb = 0; cb <= ESC_BT; cb++) dists[cb] += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g], q, cb, lambda / band->threshold, INFINITY, NULL); } dist = dists[0]; for (i = 1; i <= ESC_BT; i++) dist = FFMIN(dist, dists[i]); minrd = FFMIN(minrd, dist); for (i = FFMAX(q - SCALE_MAX_DIFF, 0); i < FFMIN(q + SCALE_MAX_DIFF, TRELLIS_STATES); i++) { float cost; int minv, maxv; if (isinf(paths[idx - 1][i].cost)) continue; cost = paths[idx - 1][i].cost + dist + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO]; minv = FFMIN(paths[idx - 1][i].min_val, q); maxv = FFMAX(paths[idx - 1][i].max_val, q); if (cost < paths[idx][q].cost && maxv-minv < SCALE_MAX_DIFF) { paths[idx][q].cost = cost; paths[idx][q].prev = i; paths[idx][q].min_val = minv; paths[idx][q].max_val = maxv; } } } } else { for (q = 0; q < TRELLIS_STATES; q++) { if (!isinf(paths[idx - 1][q].cost)) { paths[idx][q].cost = paths[idx - 1][q].cost + 1; paths[idx][q].prev = q; paths[idx][q].min_val = FFMIN(paths[idx - 1][q].min_val, q); paths[idx][q].max_val = FFMAX(paths[idx - 1][q].max_val, q); continue; } for (i = FFMAX(q - SCALE_MAX_DIFF, 0); i < FFMIN(q + SCALE_MAX_DIFF, TRELLIS_STATES); i++) { float cost; int minv, maxv; if (isinf(paths[idx - 1][i].cost)) continue; cost = paths[idx - 1][i].cost + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO]; minv = FFMIN(paths[idx - 1][i].min_val, q); maxv = FFMAX(paths[idx - 1][i].max_val, q); if (cost < paths[idx][q].cost && maxv-minv < SCALE_MAX_DIFF) { paths[idx][q].cost = cost; paths[idx][q].prev = i; paths[idx][q].min_val = minv; paths[idx][q].max_val = maxv; } } } } sce->zeroes[w*16+g] = !nz; start += sce->ics.swb_sizes[g]; idx++; } } idx--; mincost = paths[idx][0].cost; minq = 0; for (i = 1; i < TRELLIS_STATES; i++) { if (paths[idx][i].cost < mincost) { mincost = paths[idx][i].cost; minq = i; } } while (idx) { sce->sf_idx[bandaddr[idx]] = minq; minq = paths[idx][minq].prev; idx--; } //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]; }