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-rw-r--r--ffmpeg/libavcodec/aaccoder.c1140
1 files changed, 0 insertions, 1140 deletions
diff --git a/ffmpeg/libavcodec/aaccoder.c b/ffmpeg/libavcodec/aaccoder.c
deleted file mode 100644
index 50a246f..0000000
--- a/ffmpeg/libavcodec/aaccoder.c
+++ /dev/null
@@ -1,1140 +0,0 @@
-/*
- * 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) {
- av_assert1(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);
- 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;
- if (q0 < q0low) {
- q1 += q0low - q0;
- q0 = q0low;
- } else if (q1 > q1high) {
- q0 -= q1 - q1high;
- q1 = q1high;
- }
- }
-
- 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] = { 0 }, uplims[128];
- float maxvals[128];
- int fflag, minscaler;
- int its = 0;
- int allz = 0;
- float minthr = INFINITY;
-
- // for values above this the decoder might end up in an endless loop
- // due to always having more bits than what can be encoded.
- destbits = FFMIN(destbits, 5800);
- //XXX: some heuristic to determine initial quantizers will reduce search time
- //determine zero bands and upper limits
- for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
- 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;
- curband = 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] = {
- [AAC_CODER_FAAC] = {
- search_for_quantizers_faac,
- encode_window_bands_info,
- quantize_and_encode_band,
- search_for_ms,
- },
- [AAC_CODER_ANMR] = {
- search_for_quantizers_anmr,
- encode_window_bands_info,
- quantize_and_encode_band,
- search_for_ms,
- },
- [AAC_CODER_TWOLOOP] = {
- search_for_quantizers_twoloop,
- codebook_trellis_rate,
- quantize_and_encode_band,
- search_for_ms,
- },
- [AAC_CODER_FAST] = {
- search_for_quantizers_fast,
- encode_window_bands_info,
- quantize_and_encode_band,
- search_for_ms,
- },
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 10:09:24 +0000