| /* |
| * AAC coefficients encoder |
| * Copyright (C) 2008-2009 Konstantin Shishkov |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * AAC coefficients encoder |
| */ |
| |
| /*********************************** |
| * TODOs: |
| * speedup quantizer selection |
| * add sane pulse detection |
| ***********************************/ |
| |
| #include "libavutil/libm.h" // brought forward to work around cygwin header breakage |
| |
| #include <float.h> |
| #include "libavutil/mathematics.h" |
| #include "avcodec.h" |
| #include "put_bits.h" |
| #include "aac.h" |
| #include "aacenc.h" |
| #include "aactab.h" |
| |
| /** bits needed to code codebook run value for long windows */ |
| static const uint8_t run_value_bits_long[64] = { |
| 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, |
| 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10, |
| 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, |
| 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15 |
| }; |
| |
| /** bits needed to code codebook run value for short windows */ |
| static const uint8_t run_value_bits_short[16] = { |
| 3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9 |
| }; |
| |
| static const uint8_t *run_value_bits[2] = { |
| run_value_bits_long, run_value_bits_short |
| }; |
| |
| |
| /** |
| * Quantize one coefficient. |
| * @return absolute value of the quantized coefficient |
| * @see 3GPP TS26.403 5.6.2 "Scalefactor determination" |
| */ |
| static av_always_inline int quant(float coef, const float Q) |
| { |
| float a = coef * Q; |
| return sqrtf(a * sqrtf(a)) + 0.4054; |
| } |
| |
| static void quantize_bands(int *out, const float *in, const float *scaled, |
| int size, float Q34, int is_signed, int maxval) |
| { |
| int i; |
| double qc; |
| for (i = 0; i < size; i++) { |
| qc = scaled[i] * Q34; |
| out[i] = (int)FFMIN(qc + 0.4054, (double)maxval); |
| if (is_signed && in[i] < 0.0f) { |
| out[i] = -out[i]; |
| } |
| } |
| } |
| |
| static void abs_pow34_v(float *out, const float *in, const int size) |
| { |
| #ifndef USE_REALLY_FULL_SEARCH |
| int i; |
| for (i = 0; i < size; i++) { |
| float a = fabsf(in[i]); |
| out[i] = sqrtf(a * sqrtf(a)); |
| } |
| #endif /* USE_REALLY_FULL_SEARCH */ |
| } |
| |
| static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17}; |
| static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16}; |
| |
| /** |
| * 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 int q_idx = POW_SF2_ZERO - scale_idx + SCALE_ONE_POS - SCALE_DIV_512; |
| const float Q = ff_aac_pow2sf_tab [q_idx]; |
| const float Q34 = ff_aac_pow34sf_tab[q_idx]; |
| const float IQ = 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 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; |
| } |
| |
| #define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC) \ |
| static float quantize_and_encode_band_cost_ ## NAME( \ |
| 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) { \ |
| return quantize_and_encode_band_cost_template( \ |
| s, pb, in, scaled, size, scale_idx, \ |
| BT_ESC ? ESC_BT : cb, lambda, uplim, bits, \ |
| BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC); \ |
| } |
| |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO, 1, 0, 0, 0) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC, 0, 1, 1, 1) |
| |
| static float (*const quantize_and_encode_band_cost_arr[])( |
| 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) = { |
| quantize_and_encode_band_cost_ZERO, |
| quantize_and_encode_band_cost_SQUAD, |
| quantize_and_encode_band_cost_SQUAD, |
| quantize_and_encode_band_cost_UQUAD, |
| quantize_and_encode_band_cost_UQUAD, |
| quantize_and_encode_band_cost_SPAIR, |
| quantize_and_encode_band_cost_SPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_ESC, |
| }; |
| |
| #define quantize_and_encode_band_cost( \ |
| s, pb, in, scaled, size, scale_idx, cb, \ |
| lambda, uplim, bits) \ |
| quantize_and_encode_band_cost_arr[cb]( \ |
| s, pb, in, scaled, size, scale_idx, cb, \ |
| lambda, uplim, bits) |
| |
| 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); |
| } |
| |
| static float find_max_val(int group_len, int swb_size, const float *scaled) { |
| float maxval = 0.0f; |
| int w2, i; |
| for (w2 = 0; w2 < group_len; w2++) { |
| for (i = 0; i < swb_size; i++) { |
| maxval = FFMAX(maxval, scaled[w2*128+i]); |
| } |
| } |
| return maxval; |
| } |
| |
| static int find_min_book(float maxval, int sf) { |
| float Q = ff_aac_pow2sf_tab[POW_SF2_ZERO - sf + SCALE_ONE_POS - SCALE_DIV_512]; |
| float Q34 = sqrtf(Q * sqrtf(Q)); |
| int qmaxval, cb; |
| qmaxval = maxval * Q34 + 0.4054f; |
| if (qmaxval == 0) cb = 0; |
| else if (qmaxval == 1) cb = 1; |
| else if (qmaxval == 2) cb = 3; |
| else if (qmaxval <= 4) cb = 5; |
| else if (qmaxval <= 7) cb = 7; |
| else if (qmaxval <= 12) cb = 9; |
| else cb = 11; |
| return cb; |
| } |
| |
| /** |
| * 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, 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++) { |
| 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.ch[s->cur_channel].psy_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); |
| } |
| } |
| |
| static void codebook_trellis_rate(AACEncContext *s, SingleChannelElement *sce, |
| int win, int group_len, const float lambda) |
| { |
| BandCodingPath path[120][12]; |
| int w, swb, cb, start, 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_minbits = 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 = run_bits+4; |
| path[0][cb].prev_idx = -1; |
| path[0][cb].run = 0; |
| } |
| for (swb = 0; swb < max_sfb; swb++) { |
| size = sce->ics.swb_sizes[swb]; |
| if (sce->zeroes[win*16 + swb]) { |
| float cost_stay_here = path[swb][0].cost; |
| float cost_get_here = next_minbits + run_bits + 4; |
| if ( run_value_bits[sce->ics.num_windows == 8][path[swb][0].run] |
| != run_value_bits[sce->ics.num_windows == 8][path[swb][0].run+1]) |
| cost_stay_here += run_bits; |
| if (cost_get_here < cost_stay_here) { |
| path[swb+1][0].prev_idx = next_mincb; |
| path[swb+1][0].cost = cost_get_here; |
| path[swb+1][0].run = 1; |
| } else { |
| path[swb+1][0].prev_idx = 0; |
| path[swb+1][0].cost = cost_stay_here; |
| path[swb+1][0].run = path[swb][0].run + 1; |
| } |
| next_minbits = path[swb+1][0].cost; |
| next_mincb = 0; |
| for (cb = 1; cb < 12; cb++) { |
| path[swb+1][cb].cost = 61450; |
| path[swb+1][cb].prev_idx = -1; |
| path[swb+1][cb].run = 0; |
| } |
| } else { |
| float minbits = next_minbits; |
| int mincb = next_mincb; |
| int startcb = sce->band_type[win*16+swb]; |
| next_minbits = INFINITY; |
| next_mincb = 0; |
| for (cb = 0; cb < startcb; cb++) { |
| path[swb+1][cb].cost = 61450; |
| path[swb+1][cb].prev_idx = -1; |
| path[swb+1][cb].run = 0; |
| } |
| for (cb = startcb; cb < 12; cb++) { |
| float cost_stay_here, cost_get_here; |
| float bits = 0.0f; |
| for (w = 0; w < group_len; w++) { |
| bits += quantize_band_cost(s, sce->coeffs + start + w*128, |
| s->scoefs + start + w*128, size, |
| sce->sf_idx[(win+w)*16+swb], cb, |
| 0, INFINITY, NULL); |
| } |
| cost_stay_here = path[swb][cb].cost + bits; |
| cost_get_here = minbits + bits + 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_minbits) { |
| next_minbits = 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) { |
| assert(idx >= 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); |
| } |
| } |
| |
| /** Return the minimum scalefactor where the quantized coef does not clip. */ |
| static av_always_inline uint8_t coef2minsf(float coef) { |
| return av_clip_uint8(log2f(coef)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512); |
| } |
| |
| /** Return the maximum scalefactor where the quantized coef is not zero. */ |
| static av_always_inline uint8_t coef2maxsf(float coef) { |
| return av_clip_uint8(log2f(coef)*4 + 6 + SCALE_ONE_POS - SCALE_DIV_512); |
| } |
| |
| typedef struct TrellisPath { |
| float cost; |
| int prev; |
| } TrellisPath; |
| |
| #define TRELLIS_STAGES 121 |
| #define TRELLIS_STATES (SCALE_MAX_DIFF+1) |
| |
| 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; |
| float q0f = FLT_MAX, q1f = 0.0f, qnrgf = 0.0f; |
| int q0, q1, qcnt = 0; |
| |
| for (i = 0; i < 1024; i++) { |
| float t = fabsf(sce->coeffs[i]); |
| if (t > 0.0f) { |
| q0f = FFMIN(q0f, t); |
| q1f = FFMAX(q1f, t); |
| qnrgf += t*t; |
| qcnt++; |
| } |
| } |
| |
| if (!qcnt) { |
| memset(sce->sf_idx, 0, sizeof(sce->sf_idx)); |
| memset(sce->zeroes, 1, sizeof(sce->zeroes)); |
| return; |
| } |
| |
| //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped |
| q0 = coef2minsf(q0f); |
| //maximum scalefactor index is when maximum coefficient after quantizing is still not zero |
| q1 = coef2maxsf(q1f); |
| //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1); |
| if (q1 - q0 > 60) { |
| int q0low = q0; |
| int q1high = q1; |
| //minimum scalefactor index is when maximum nonzero coefficient after quantizing is not clipped |
| int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512); |
| q1 = qnrg + 30; |
| q0 = qnrg - 30; |
| //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1); |
| if (q0 < q0low) { |
| q1 += q0low - q0; |
| q0 = q0low; |
| } else if (q1 > q1high) { |
| q0 -= q1 - q1high; |
| q1 = q1high; |
| } |
| } |
| //av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1); |
| |
| for (i = 0; i < TRELLIS_STATES; i++) { |
| paths[0][i].cost = 0.0f; |
| paths[0][i].prev = -1; |
| } |
| for (j = 1; j < TRELLIS_STAGES; j++) { |
| for (i = 0; i < TRELLIS_STATES; i++) { |
| paths[j][i].cost = INFINITY; |
| paths[j][i].prev = -2; |
| } |
| } |
| 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.ch[s->cur_channel].psy_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; |
| float maxval; |
| //minimum scalefactor index is when minimum nonzero coefficient after quantizing is not clipped |
| minscale = coef2minsf(qmin); |
| //maximum scalefactor index is when maximum coefficient after quantizing is still not zero |
| maxscale = coef2maxsf(qmax); |
| minscale = av_clip(minscale - q0, 0, TRELLIS_STATES - 1); |
| maxscale = av_clip(maxscale - q0, 0, TRELLIS_STATES); |
| maxval = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], s->scoefs+start); |
| for (q = minscale; q < maxscale; q++) { |
| float dist = 0; |
| int cb = find_min_book(maxval, sce->sf_idx[w*16+g]); |
| for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { |
| FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; |
| dist += quantize_band_cost(s, coefs + w2*128, s->scoefs + start + w2*128, sce->ics.swb_sizes[g], |
| q + q0, cb, lambda / band->threshold, INFINITY, NULL); |
| } |
| minrd = FFMIN(minrd, dist); |
| |
| for (i = 0; i < q1 - q0; i++) { |
| float cost; |
| cost = paths[idx - 1][i].cost + dist |
| + ff_aac_scalefactor_bits[q - i + SCALE_DIFF_ZERO]; |
| if (cost < paths[idx][q].cost) { |
| paths[idx][q].cost = cost; |
| paths[idx][q].prev = i; |
| } |
| } |
| } |
| } else { |
| for (q = 0; q < q1 - q0; q++) { |
| paths[idx][q].cost = paths[idx - 1][q].cost + 1; |
| paths[idx][q].prev = q; |
| } |
| } |
| 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 + q0; |
| 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]; |
| } |
| |
| /** |
| * two-loop quantizers search taken from ISO 13818-7 Appendix C |
| */ |
| static void search_for_quantizers_twoloop(AVCodecContext *avctx, |
| AACEncContext *s, |
| SingleChannelElement *sce, |
| const float lambda) |
| { |
| int start = 0, i, w, w2, g; |
| int destbits = avctx->bit_rate * 1024.0 / avctx->sample_rate / avctx->channels * (lambda / 120.f); |
| float dists[128], uplims[128]; |
| float maxvals[128]; |
| int fflag, minscaler; |
| int its = 0; |
| int allz = 0; |
| float minthr = INFINITY; |
| |
| //XXX: some heuristic to determine initial quantizers will reduce search time |
| memset(dists, 0, sizeof(dists)); |
| //determine zero bands and upper limits |
| for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { |
| for (g = 0; g < sce->ics.num_swb; g++) { |
| int nz = 0; |
| float uplim = 0.0f; |
| for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { |
| FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; |
| uplim += band->threshold; |
| if (band->energy <= band->threshold || band->threshold == 0.0f) { |
| sce->zeroes[(w+w2)*16+g] = 1; |
| continue; |
| } |
| nz = 1; |
| } |
| uplims[w*16+g] = uplim *512; |
| sce->zeroes[w*16+g] = !nz; |
| if (nz) |
| minthr = FFMIN(minthr, uplim); |
| allz |= nz; |
| } |
| } |
| for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { |
| for (g = 0; g < sce->ics.num_swb; g++) { |
| if (sce->zeroes[w*16+g]) { |
| sce->sf_idx[w*16+g] = SCALE_ONE_POS; |
| continue; |
| } |
| sce->sf_idx[w*16+g] = SCALE_ONE_POS + FFMIN(log2f(uplims[w*16+g]/minthr)*4,59); |
| } |
| } |
| |
| if (!allz) |
| return; |
| 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 *scaled = s->scoefs + start; |
| maxvals[w*16+g] = find_max_val(sce->ics.group_len[w], sce->ics.swb_sizes[g], scaled); |
| start += sce->ics.swb_sizes[g]; |
| } |
| } |
| |
| //perform two-loop search |
| //outer loop - improve quality |
| do { |
| int tbits, qstep; |
| minscaler = sce->sf_idx[0]; |
| //inner loop - quantize spectrum to fit into given number of bits |
| qstep = its ? 1 : 32; |
| do { |
| int prev = -1; |
| tbits = 0; |
| fflag = 0; |
| for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { |
| start = w*128; |
| for (g = 0; g < sce->ics.num_swb; g++) { |
| const float *coefs = sce->coeffs + start; |
| const float *scaled = s->scoefs + start; |
| int bits = 0; |
| int cb; |
| float dist = 0.0f; |
| |
| if (sce->zeroes[w*16+g] || sce->sf_idx[w*16+g] >= 218) { |
| start += sce->ics.swb_sizes[g]; |
| continue; |
| } |
| minscaler = FFMIN(minscaler, sce->sf_idx[w*16+g]); |
| cb = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]); |
| for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { |
| int b; |
| dist += quantize_band_cost(s, coefs + w2*128, |
| scaled + w2*128, |
| sce->ics.swb_sizes[g], |
| sce->sf_idx[w*16+g], |
| cb, |
| 1.0f, |
| INFINITY, |
| &b); |
| bits += b; |
| } |
| dists[w*16+g] = dist - bits; |
| if (prev != -1) { |
| bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO]; |
| } |
| tbits += bits; |
| start += sce->ics.swb_sizes[g]; |
| prev = sce->sf_idx[w*16+g]; |
| } |
| } |
| if (tbits > destbits) { |
| for (i = 0; i < 128; i++) |
| if (sce->sf_idx[i] < 218 - qstep) |
| sce->sf_idx[i] += qstep; |
| } else { |
| for (i = 0; i < 128; i++) |
| if (sce->sf_idx[i] > 60 - qstep) |
| sce->sf_idx[i] -= qstep; |
| } |
| qstep >>= 1; |
| if (!qstep && tbits > destbits*1.02 && sce->sf_idx[0] < 217) |
| qstep = 1; |
| } while (qstep); |
| |
| fflag = 0; |
| minscaler = av_clip(minscaler, 60, 255 - SCALE_MAX_DIFF); |
| for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { |
| for (g = 0; g < sce->ics.num_swb; g++) { |
| int prevsc = sce->sf_idx[w*16+g]; |
| if (dists[w*16+g] > uplims[w*16+g] && sce->sf_idx[w*16+g] > 60) { |
| if (find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]-1)) |
| sce->sf_idx[w*16+g]--; |
| else //Try to make sure there is some energy in every band |
| sce->sf_idx[w*16+g]-=2; |
| } |
| sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler, minscaler + SCALE_MAX_DIFF); |
| sce->sf_idx[w*16+g] = FFMIN(sce->sf_idx[w*16+g], 219); |
| if (sce->sf_idx[w*16+g] != prevsc) |
| fflag = 1; |
| sce->band_type[w*16+g] = find_min_book(maxvals[w*16+g], sce->sf_idx[w*16+g]); |
| } |
| } |
| its++; |
| } while (fflag && its < 10); |
| } |
| |
| static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s, |
| SingleChannelElement *sce, |
| const float lambda) |
| { |
| int start = 0, i, w, w2, g; |
| float uplim[128], maxq[128]; |
| int minq, maxsf; |
| float distfact = ((sce->ics.num_windows > 1) ? 85.80 : 147.84) / lambda; |
| int last = 0, lastband = 0, curband = 0; |
| float avg_energy = 0.0; |
| if (sce->ics.num_windows == 1) { |
| start = 0; |
| for (i = 0; i < 1024; i++) { |
| if (i - start >= sce->ics.swb_sizes[curband]) { |
| start += sce->ics.swb_sizes[curband]; |
| curband++; |
| } |
| if (sce->coeffs[i]) { |
| avg_energy += sce->coeffs[i] * sce->coeffs[i]; |
| last = i; |
| lastband = curband; |
| } |
| } |
| } else { |
| for (w = 0; w < 8; w++) { |
| const float *coeffs = sce->coeffs + w*128; |
| start = 0; |
| for (i = 0; i < 128; i++) { |
| if (i - start >= sce->ics.swb_sizes[curband]) { |
| start += sce->ics.swb_sizes[curband]; |
| curband++; |
| } |
| if (coeffs[i]) { |
| avg_energy += coeffs[i] * coeffs[i]; |
| last = FFMAX(last, i); |
| lastband = FFMAX(lastband, curband); |
| } |
| } |
| } |
| } |
| last++; |
| avg_energy /= last; |
| if (avg_energy == 0.0f) { |
| for (i = 0; i < FF_ARRAY_ELEMS(sce->sf_idx); i++) |
| sce->sf_idx[i] = SCALE_ONE_POS; |
| return; |
| } |
| 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++) { |
| float *coefs = sce->coeffs + start; |
| const int size = sce->ics.swb_sizes[g]; |
| int start2 = start, end2 = start + size, peakpos = start; |
| float maxval = -1, thr = 0.0f, t; |
| maxq[w*16+g] = 0.0f; |
| if (g > lastband) { |
| maxq[w*16+g] = 0.0f; |
| start += size; |
| for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) |
| memset(coefs + w2*128, 0, sizeof(coefs[0])*size); |
| continue; |
| } |
| for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { |
| for (i = 0; i < size; i++) { |
| float t = coefs[w2*128+i]*coefs[w2*128+i]; |
| maxq[w*16+g] = FFMAX(maxq[w*16+g], fabsf(coefs[w2*128 + i])); |
| thr += t; |
| if (sce->ics.num_windows == 1 && maxval < t) { |
| maxval = t; |
| peakpos = start+i; |
| } |
| } |
| } |
| if (sce->ics.num_windows == 1) { |
| start2 = FFMAX(peakpos - 2, start2); |
| end2 = FFMIN(peakpos + 3, end2); |
| } else { |
| start2 -= start; |
| end2 -= start; |
| } |
| start += size; |
| thr = pow(thr / (avg_energy * (end2 - start2)), 0.3 + 0.1*(lastband - g) / lastband); |
| t = 1.0 - (1.0 * start2 / last); |
| uplim[w*16+g] = distfact / (1.4 * thr + t*t*t + 0.075); |
| } |
| } |
| memset(sce->sf_idx, 0, sizeof(sce->sf_idx)); |
| 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; |
| const float *scaled = s->scoefs + start; |
| const int size = sce->ics.swb_sizes[g]; |
| int scf, prev_scf, step; |
| int min_scf = -1, max_scf = 256; |
| float curdiff; |
| if (maxq[w*16+g] < 21.544) { |
| sce->zeroes[w*16+g] = 1; |
| start += size; |
| continue; |
| } |
| sce->zeroes[w*16+g] = 0; |
| scf = prev_scf = av_clip(SCALE_ONE_POS - SCALE_DIV_512 - log2f(1/maxq[w*16+g])*16/3, 60, 218); |
| step = 16; |
| for (;;) { |
| float dist = 0.0f; |
| int quant_max; |
| |
| for (w2 = 0; w2 < sce->ics.group_len[w]; w2++) { |
| int b; |
| dist += quantize_band_cost(s, coefs + w2*128, |
| scaled + w2*128, |
| sce->ics.swb_sizes[g], |
| scf, |
| ESC_BT, |
| lambda, |
| INFINITY, |
| &b); |
| dist -= b; |
| } |
| dist *= 1.0f / 512.0f / lambda; |
| quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[POW_SF2_ZERO - scf + SCALE_ONE_POS - SCALE_DIV_512]); |
| if (quant_max >= 8191) { // too much, return to the previous quantizer |
| sce->sf_idx[w*16+g] = prev_scf; |
| break; |
| } |
| prev_scf = scf; |
| curdiff = fabsf(dist - uplim[w*16+g]); |
| if (curdiff <= 1.0f) |
| step = 0; |
| else |
| step = log2f(curdiff); |
| if (dist > uplim[w*16+g]) |
| step = -step; |
| scf += step; |
| scf = av_clip_uint8(scf); |
| step = scf - prev_scf; |
| if (FFABS(step) <= 1 || (step > 0 && scf >= max_scf) || (step < 0 && scf <= min_scf)) { |
| sce->sf_idx[w*16+g] = av_clip(scf, min_scf, max_scf); |
| break; |
| } |
| if (step > 0) |
| min_scf = prev_scf; |
| else |
| max_scf = prev_scf; |
| } |
| start += size; |
| } |
| } |
| minq = sce->sf_idx[0] ? sce->sf_idx[0] : INT_MAX; |
| for (i = 1; i < 128; i++) { |
| if (!sce->sf_idx[i]) |
| sce->sf_idx[i] = sce->sf_idx[i-1]; |
| else |
| minq = FFMIN(minq, sce->sf_idx[i]); |
| } |
| if (minq == INT_MAX) |
| minq = 0; |
| minq = FFMIN(minq, SCALE_MAX_POS); |
| maxsf = FFMIN(minq + SCALE_MAX_DIFF, SCALE_MAX_POS); |
| for (i = 126; i >= 0; i--) { |
| if (!sce->sf_idx[i]) |
| sce->sf_idx[i] = sce->sf_idx[i+1]; |
| sce->sf_idx[i] = av_clip(sce->sf_idx[i], minq, maxsf); |
| } |
| } |
| |
| static void search_for_quantizers_fast(AVCodecContext *avctx, AACEncContext *s, |
| SingleChannelElement *sce, |
| const float lambda) |
| { |
| int i, w, w2, g; |
| int minq = 255; |
| |
| memset(sce->sf_idx, 0, sizeof(sce->sf_idx)); |
| 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 = 0; w2 < sce->ics.group_len[w]; w2++) { |
| FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[(w+w2)*16+g]; |
| if (band->energy <= band->threshold) { |
| sce->sf_idx[(w+w2)*16+g] = 218; |
| sce->zeroes[(w+w2)*16+g] = 1; |
| } else { |
| sce->sf_idx[(w+w2)*16+g] = av_clip(SCALE_ONE_POS - SCALE_DIV_512 + log2f(band->threshold), 80, 218); |
| sce->zeroes[(w+w2)*16+g] = 0; |
| } |
| minq = FFMIN(minq, sce->sf_idx[(w+w2)*16+g]); |
| } |
| } |
| } |
| for (i = 0; i < 128; i++) { |
| sce->sf_idx[i] = 140; |
| //av_clip(sce->sf_idx[i], minq, minq + SCALE_MAX_DIFF - 1); |
| } |
| //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]; |
| } |
| |
| static void search_for_ms(AACEncContext *s, ChannelElement *cpe, |
| const float lambda) |
| { |
| int start = 0, i, w, w2, g; |
| float M[128], S[128]; |
| float *L34 = s->scoefs, *R34 = s->scoefs + 128, *M34 = s->scoefs + 128*2, *S34 = s->scoefs + 128*3; |
| SingleChannelElement *sce0 = &cpe->ch[0]; |
| SingleChannelElement *sce1 = &cpe->ch[1]; |
| if (!cpe->common_window) |
| return; |
| for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) { |
| for (g = 0; g < sce0->ics.num_swb; g++) { |
| if (!cpe->ch[0].zeroes[w*16+g] && !cpe->ch[1].zeroes[w*16+g]) { |
| float dist1 = 0.0f, dist2 = 0.0f; |
| 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); |
| float maxthr = FFMAX(band0->threshold, band1->threshold); |
| for (i = 0; i < sce0->ics.swb_sizes[g]; i++) { |
| M[i] = (sce0->coeffs[start+w2*128+i] |
| + sce1->coeffs[start+w2*128+i]) * 0.5; |
| S[i] = M[i] |
| - sce1->coeffs[start+w2*128+i]; |
| } |
| abs_pow34_v(L34, sce0->coeffs+start+w2*128, sce0->ics.swb_sizes[g]); |
| abs_pow34_v(R34, sce1->coeffs+start+w2*128, sce0->ics.swb_sizes[g]); |
| abs_pow34_v(M34, M, sce0->ics.swb_sizes[g]); |
| abs_pow34_v(S34, S, sce0->ics.swb_sizes[g]); |
| dist1 += quantize_band_cost(s, sce0->coeffs + start + w2*128, |
| L34, |
| sce0->ics.swb_sizes[g], |
| sce0->sf_idx[(w+w2)*16+g], |
| sce0->band_type[(w+w2)*16+g], |
| lambda / band0->threshold, INFINITY, NULL); |
| dist1 += quantize_band_cost(s, sce1->coeffs + start + w2*128, |
| R34, |
| sce1->ics.swb_sizes[g], |
| sce1->sf_idx[(w+w2)*16+g], |
| sce1->band_type[(w+w2)*16+g], |
| lambda / band1->threshold, INFINITY, NULL); |
| dist2 += quantize_band_cost(s, M, |
| M34, |
| sce0->ics.swb_sizes[g], |
| sce0->sf_idx[(w+w2)*16+g], |
| sce0->band_type[(w+w2)*16+g], |
| lambda / maxthr, INFINITY, NULL); |
| dist2 += quantize_band_cost(s, S, |
| S34, |
| sce1->ics.swb_sizes[g], |
| sce1->sf_idx[(w+w2)*16+g], |
| sce1->band_type[(w+w2)*16+g], |
| lambda / minthr, INFINITY, NULL); |
| } |
| cpe->ms_mask[w*16+g] = dist2 < dist1; |
| } |
| start += sce0->ics.swb_sizes[g]; |
| } |
| } |
| } |
| |
| AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB] = { |
| { |
| search_for_quantizers_faac, |
| encode_window_bands_info, |
| quantize_and_encode_band, |
| search_for_ms, |
| }, |
| { |
| search_for_quantizers_anmr, |
| encode_window_bands_info, |
| quantize_and_encode_band, |
| search_for_ms, |
| }, |
| { |
| search_for_quantizers_twoloop, |
| codebook_trellis_rate, |
| quantize_and_encode_band, |
| search_for_ms, |
| }, |
| { |
| search_for_quantizers_fast, |
| encode_window_bands_info, |
| quantize_and_encode_band, |
| search_for_ms, |
| }, |
| }; |
