/* * MPEG-4 Parametric Stereo decoding functions * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com> * * 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 * * Note: Rounding-to-nearest used unless otherwise stated * */ #include <stdint.h>#include "libavutil/common.h"#include "libavutil/mathematics.h"#include "libavutil/mem_internal.h"#include "aacps.h"#if USE_FIXED#include "aacps_fixed_tablegen.h"#else#include "libavutil/internal.h"#include "aacps_tablegen.h"#endif /* USE_FIXED */ static const INTFLOAT g1_Q2[] = {    Q31(0.0f),  Q31(0.01899487526049f), Q31(0.0f), Q31(-0.07293139167538f),    Q31(0.0f),  Q31(0.30596630545168f), Q31(0.5f)}; static void ipdopd_reset(int8_t *ipd_hist, int8_t *opd_hist){    int i;    for (i = 0; i < PS_MAX_NR_IPDOPD; i++) {        opd_hist[i] = 0;        ipd_hist[i] = 0;    }} /** Split one subband into 2 subsubbands with a symmetric real filter. * The filter must have its non-center even coefficients equal to zero. */static void hybrid2_re(INTFLOAT (*in)[2], INTFLOAT (*out)[32][2],                       const INTFLOAT filter[7], int len, int reverse){    int i, j;    for (i = 0; i < len; i++, in++) {        INT64FLOAT re_in = AAC_MUL31(filter[6], in[6][0]); //real inphase        INT64FLOAT re_op = 0.0f;                          //real out of phase        INT64FLOAT im_in = AAC_MUL31(filter[6], in[6][1]); //imag inphase        INT64FLOAT im_op = 0.0f;                          //imag out of phase        for (j = 0; j < 6; j += 2) {            re_op += (INT64FLOAT)filter[j+1] * (in[j+1][0] + in[12-j-1][0]);            im_op += (INT64FLOAT)filter[j+1] * (in[j+1][1] + in[12-j-1][1]);        } #if USE_FIXED        re_op = (re_op + 0x40000000) >> 31;        im_op = (im_op + 0x40000000) >> 31;#endif /* USE_FIXED */         out[ reverse][i][0] = (INTFLOAT)(re_in + re_op);        out[ reverse][i][1] = (INTFLOAT)(im_in + im_op);        out[!reverse][i][0] = (INTFLOAT)(re_in - re_op);        out[!reverse][i][1] = (INTFLOAT)(im_in - im_op);    }} /** Split one subband into 6 subsubbands with a complex filter */static void hybrid6_cx(PSDSPContext *dsp, INTFLOAT (*in)[2], INTFLOAT (*out)[32][2],                       TABLE_CONST INTFLOAT (*filter)[8][2], int len){    int i;    int N = 8;    LOCAL_ALIGNED_16(INTFLOAT, temp, [8], [2]);     for (i = 0; i < len; i++, in++) {        dsp->hybrid_analysis(temp, in, (const INTFLOAT (*)[8][2]) filter, 1, N);        out[0][i][0] = temp[6][0];        out[0][i][1] = temp[6][1];        out[1][i][0] = temp[7][0];        out[1][i][1] = temp[7][1];        out[2][i][0] = temp[0][0];        out[2][i][1] = temp[0][1];        out[3][i][0] = temp[1][0];        out[3][i][1] = temp[1][1];        out[4][i][0] = temp[2][0] + temp[5][0];        out[4][i][1] = temp[2][1] + temp[5][1];        out[5][i][0] = temp[3][0] + temp[4][0];        out[5][i][1] = temp[3][1] + temp[4][1];    }} static void hybrid4_8_12_cx(PSDSPContext *dsp,                            INTFLOAT (*in)[2], INTFLOAT (*out)[32][2],                            TABLE_CONST INTFLOAT (*filter)[8][2], int N, int len){    int i;     for (i = 0; i < len; i++, in++) {        dsp->hybrid_analysis(out[0] + i, in, (const INTFLOAT (*)[8][2]) filter, 32, N);    }} static void hybrid_analysis(PSDSPContext *dsp, INTFLOAT out[91][32][2],                            INTFLOAT in[5][44][2], INTFLOAT L[2][38][64],                            int is34, int len){    int i, j;    for (i = 0; i < 5; i++) {        for (j = 0; j < 38; j++) {            in[i][j+6][0] = L[0][j][i];            in[i][j+6][1] = L[1][j][i];        }    }    if (is34) {        hybrid4_8_12_cx(dsp, in[0], out,    f34_0_12, 12, len);        hybrid4_8_12_cx(dsp, in[1], out+12, f34_1_8,   8, len);        hybrid4_8_12_cx(dsp, in[2], out+20, f34_2_4,   4, len);        hybrid4_8_12_cx(dsp, in[3], out+24, f34_2_4,   4, len);        hybrid4_8_12_cx(dsp, in[4], out+28, f34_2_4,   4, len);        dsp->hybrid_analysis_ileave(out + 27, L, 5, len);    } else {        hybrid6_cx(dsp, in[0], out, f20_0_8, len);        hybrid2_re(in[1], out+6, g1_Q2, len, 1);        hybrid2_re(in[2], out+8, g1_Q2, len, 0);        dsp->hybrid_analysis_ileave(out + 7, L, 3, len);    }    //update in_buf    for (i = 0; i < 5; i++) {        memcpy(in[i], in[i]+32, 6 * sizeof(in[i][0]));    }} static void hybrid_synthesis(PSDSPContext *dsp, INTFLOAT out[2][38][64],                             INTFLOAT in[91][32][2], int is34, int len){    int i, n;    if (is34) {        for (n = 0; n < len; n++) {            memset(out[0][n], 0, 5*sizeof(out[0][n][0]));            memset(out[1][n], 0, 5*sizeof(out[1][n][0]));            for (i = 0; i < 12; i++) {                out[0][n][0] += (UINTFLOAT)in[   i][n][0];                out[1][n][0] += (UINTFLOAT)in[   i][n][1];            }            for (i = 0; i < 8; i++) {                out[0][n][1] += (UINTFLOAT)in[12+i][n][0];                out[1][n][1] += (UINTFLOAT)in[12+i][n][1];            }            for (i = 0; i < 4; i++) {                out[0][n][2] += (UINTFLOAT)in[20+i][n][0];                out[1][n][2] += (UINTFLOAT)in[20+i][n][1];                out[0][n][3] += (UINTFLOAT)in[24+i][n][0];                out[1][n][3] += (UINTFLOAT)in[24+i][n][1];                out[0][n][4] += (UINTFLOAT)in[28+i][n][0];                out[1][n][4] += (UINTFLOAT)in[28+i][n][1];            }        }        dsp->hybrid_synthesis_deint(out, in + 27, 5, len);    } else {        for (n = 0; n < len; n++) {            out[0][n][0] = (UINTFLOAT)in[0][n][0] + in[1][n][0] + in[2][n][0] +                           (UINTFLOAT)in[3][n][0] + in[4][n][0] + in[5][n][0];            out[1][n][0] = (UINTFLOAT)in[0][n][1] + in[1][n][1] + in[2][n][1] +                           (UINTFLOAT)in[3][n][1] + in[4][n][1] + in[5][n][1];            out[0][n][1] = (UINTFLOAT)in[6][n][0] + in[7][n][0];            out[1][n][1] = (UINTFLOAT)in[6][n][1] + in[7][n][1];            out[0][n][2] = (UINTFLOAT)in[8][n][0] + in[9][n][0];            out[1][n][2] = (UINTFLOAT)in[8][n][1] + in[9][n][1];        }        dsp->hybrid_synthesis_deint(out, in + 7, 3, len);    }} /// All-pass filter decay slope#define DECAY_SLOPE      Q30(0.05f)/// Number of frequency bands that can be addressed by the parameter index, b(k)static const int   NR_PAR_BANDS[]      = { 20, 34 };static const int   NR_IPDOPD_BANDS[]   = { 11, 17 };/// Number of frequency bands that can be addressed by the sub subband index, kstatic const int   NR_BANDS[]          = { 71, 91 };/// Start frequency band for the all-pass filter decay slopestatic const int   DECAY_CUTOFF[]      = { 10, 32 };/// Number of all-pass filer bandsstatic const int   NR_ALLPASS_BANDS[]  = { 30, 50 };/// First stereo band using the short one sample delaystatic const int   SHORT_DELAY_BAND[]  = { 42, 62 }; /** Table 8.46 */static void map_idx_10_to_20(int8_t *par_mapped, const int8_t *par, int full){    int b;    if (full)        b = 9;    else {        b = 4;        par_mapped[10] = 0;    }    for (; b >= 0; b--) {        par_mapped[2*b+1] = par_mapped[2*b] = par[b];    }} static void map_idx_34_to_20(int8_t *par_mapped, const int8_t *par, int full){    par_mapped[ 0] = (2*par[ 0] +   par[ 1]) / 3;    par_mapped[ 1] = (  par[ 1] + 2*par[ 2]) / 3;    par_mapped[ 2] = (2*par[ 3] +   par[ 4]) / 3;    par_mapped[ 3] = (  par[ 4] + 2*par[ 5]) / 3;    par_mapped[ 4] = (  par[ 6] +   par[ 7]) / 2;    par_mapped[ 5] = (  par[ 8] +   par[ 9]) / 2;    par_mapped[ 6] =    par[10];    par_mapped[ 7] =    par[11];    par_mapped[ 8] = (  par[12] +   par[13]) / 2;    par_mapped[ 9] = (  par[14] +   par[15]) / 2;    par_mapped[10] =    par[16];    if (full) {        par_mapped[11] =    par[17];        par_mapped[12] =    par[18];        par_mapped[13] =    par[19];        par_mapped[14] = (  par[20] +   par[21]) / 2;        par_mapped[15] = (  par[22] +   par[23]) / 2;        par_mapped[16] = (  par[24] +   par[25]) / 2;        par_mapped[17] = (  par[26] +   par[27]) / 2;        par_mapped[18] = (  par[28] +   par[29] +   par[30] +   par[31]) / 4;        par_mapped[19] = (  par[32] +   par[33]) / 2;    }} static void map_val_34_to_20(INTFLOAT par[PS_MAX_NR_IIDICC]){#if USE_FIXED    par[ 0] = (int)(((int64_t)(par[ 0] + (unsigned)(par[ 1]>>1)) * 1431655765 + \                      0x40000000) >> 31);    par[ 1] = (int)(((int64_t)((par[ 1]>>1) + (unsigned)par[ 2]) * 1431655765 + \                      0x40000000) >> 31);    par[ 2] = (int)(((int64_t)(par[ 3] + (unsigned)(par[ 4]>>1)) * 1431655765 + \                      0x40000000) >> 31);    par[ 3] = (int)(((int64_t)((par[ 4]>>1) + (unsigned)par[ 5]) * 1431655765 + \                      0x40000000) >> 31);#else    par[ 0] = (2*par[ 0] +   par[ 1]) * 0.33333333f;    par[ 1] = (  par[ 1] + 2*par[ 2]) * 0.33333333f;    par[ 2] = (2*par[ 3] +   par[ 4]) * 0.33333333f;    par[ 3] = (  par[ 4] + 2*par[ 5]) * 0.33333333f;#endif /* USE_FIXED */    par[ 4] = AAC_HALF_SUM(par[ 6], par[ 7]);    par[ 5] = AAC_HALF_SUM(par[ 8], par[ 9]);    par[ 6] =    par[10];    par[ 7] =    par[11];    par[ 8] = AAC_HALF_SUM(par[12], par[13]);    par[ 9] = AAC_HALF_SUM(par[14], par[15]);    par[10] =    par[16];    par[11] =    par[17];    par[12] =    par[18];    par[13] =    par[19];    par[14] = AAC_HALF_SUM(par[20], par[21]);    par[15] = AAC_HALF_SUM(par[22], par[23]);    par[16] = AAC_HALF_SUM(par[24], par[25]);    par[17] = AAC_HALF_SUM(par[26], par[27]);#if USE_FIXED    par[18] = (((par[28]+2)>>2) + ((par[29]+2)>>2) + ((par[30]+2)>>2) + ((par[31]+2)>>2));#else    par[18] = (  par[28] +   par[29] +   par[30] +   par[31]) * 0.25f;#endif /* USE_FIXED */    par[19] = AAC_HALF_SUM(par[32], par[33]);} static void map_idx_10_to_34(int8_t *par_mapped, const int8_t *par, int full){    if (full) {        par_mapped[33] = par[9];        par_mapped[32] = par[9];        par_mapped[31] = par[9];        par_mapped[30] = par[9];        par_mapped[29] = par[9];        par_mapped[28] = par[9];        par_mapped[27] = par[8];        par_mapped[26] = par[8];        par_mapped[25] = par[8];        par_mapped[24] = par[8];        par_mapped[23] = par[7];        par_mapped[22] = par[7];        par_mapped[21] = par[7];        par_mapped[20] = par[7];        par_mapped[19] = par[6];        par_mapped[18] = par[6];        par_mapped[17] = par[5];        par_mapped[16] = par[5];    } else {        par_mapped[16] =      0;    }    par_mapped[15] = par[4];    par_mapped[14] = par[4];    par_mapped[13] = par[4];    par_mapped[12] = par[4];    par_mapped[11] = par[3];    par_mapped[10] = par[3];    par_mapped[ 9] = par[2];    par_mapped[ 8] = par[2];    par_mapped[ 7] = par[2];    par_mapped[ 6] = par[2];    par_mapped[ 5] = par[1];    par_mapped[ 4] = par[1];    par_mapped[ 3] = par[1];    par_mapped[ 2] = par[0];    par_mapped[ 1] = par[0];    par_mapped[ 0] = par[0];} static void map_idx_20_to_34(int8_t *par_mapped, const int8_t *par, int full){    if (full) {        par_mapped[33] =  par[19];        par_mapped[32] =  par[19];        par_mapped[31] =  par[18];        par_mapped[30] =  par[18];        par_mapped[29] =  par[18];        par_mapped[28] =  par[18];        par_mapped[27] =  par[17];        par_mapped[26] =  par[17];        par_mapped[25] =  par[16];        par_mapped[24] =  par[16];        par_mapped[23] =  par[15];        par_mapped[22] =  par[15];        par_mapped[21] =  par[14];        par_mapped[20] =  par[14];        par_mapped[19] =  par[13];        par_mapped[18] =  par[12];        par_mapped[17] =  par[11];    }    par_mapped[16] =  par[10];    par_mapped[15] =  par[ 9];    par_mapped[14] =  par[ 9];    par_mapped[13] =  par[ 8];    par_mapped[12] =  par[ 8];    par_mapped[11] =  par[ 7];    par_mapped[10] =  par[ 6];    par_mapped[ 9] =  par[ 5];    par_mapped[ 8] =  par[ 5];    par_mapped[ 7] =  par[ 4];    par_mapped[ 6] =  par[ 4];    par_mapped[ 5] =  par[ 3];    par_mapped[ 4] = (par[ 2] + par[ 3]) / 2;    par_mapped[ 3] =  par[ 2];    par_mapped[ 2] =  par[ 1];    par_mapped[ 1] = (par[ 0] + par[ 1]) / 2;    par_mapped[ 0] =  par[ 0];} static void map_val_20_to_34(INTFLOAT par[PS_MAX_NR_IIDICC]){    par[33] =  par[19];    par[32] =  par[19];    par[31] =  par[18];    par[30] =  par[18];    par[29] =  par[18];    par[28] =  par[18];    par[27] =  par[17];    par[26] =  par[17];    par[25] =  par[16];    par[24] =  par[16];    par[23] =  par[15];    par[22] =  par[15];    par[21] =  par[14];    par[20] =  par[14];    par[19] =  par[13];    par[18] =  par[12];    par[17] =  par[11];    par[16] =  par[10];    par[15] =  par[ 9];    par[14] =  par[ 9];    par[13] =  par[ 8];    par[12] =  par[ 8];    par[11] =  par[ 7];    par[10] =  par[ 6];    par[ 9] =  par[ 5];    par[ 8] =  par[ 5];    par[ 7] =  par[ 4];    par[ 6] =  par[ 4];    par[ 5] =  par[ 3];    par[ 4] = AAC_HALF_SUM(par[ 2], par[ 3]);    par[ 3] =  par[ 2];    par[ 2] =  par[ 1];    par[ 1] = AAC_HALF_SUM(par[ 0], par[ 1]);} static void decorrelation(PSContext *ps, INTFLOAT (*out)[32][2], const INTFLOAT (*s)[32][2], int is34){    LOCAL_ALIGNED_16(INTFLOAT, power, [34], [PS_QMF_TIME_SLOTS]);    LOCAL_ALIGNED_16(INTFLOAT, transient_gain, [34], [PS_QMF_TIME_SLOTS]);    INTFLOAT *peak_decay_nrg = ps->peak_decay_nrg;    INTFLOAT *power_smooth = ps->power_smooth;    INTFLOAT *peak_decay_diff_smooth = ps->peak_decay_diff_smooth;    INTFLOAT (*delay)[PS_QMF_TIME_SLOTS + PS_MAX_DELAY][2] = ps->delay;    INTFLOAT (*ap_delay)[PS_AP_LINKS][PS_QMF_TIME_SLOTS + PS_MAX_AP_DELAY][2] = ps->ap_delay;#if !USE_FIXED    const float transient_impact  = 1.5f;    const float a_smooth          = 0.25f; ///< Smoothing coefficient#endif /* USE_FIXED */    const int8_t *const k_to_i = is34 ? ff_k_to_i_34 : ff_k_to_i_20;    int i, k, m, n;    int n0 = 0, nL = 32;    const INTFLOAT peak_decay_factor = Q31(0.76592833836465f);     memset(power, 0, 34 * sizeof(*power));     if (is34 != ps->common.is34bands_old) {        memset(ps->peak_decay_nrg,         0, sizeof(ps->peak_decay_nrg));        memset(ps->power_smooth,           0, sizeof(ps->power_smooth));        memset(ps->peak_decay_diff_smooth, 0, sizeof(ps->peak_decay_diff_smooth));        memset(ps->delay,                  0, sizeof(ps->delay));        memset(ps->ap_delay,               0, sizeof(ps->ap_delay));    }     for (k = 0; k < NR_BANDS[is34]; k++) {        int i = k_to_i[k];        ps->dsp.add_squares(power[i], s[k], nL - n0);    }     //Transient detection#if USE_FIXED    for (i = 0; i < NR_PAR_BANDS[is34]; i++) {        for (n = n0; n < nL; n++) {            int decayed_peak;            decayed_peak = (int)(((int64_t)peak_decay_factor * \                                           peak_decay_nrg[i] + 0x40000000) >> 31);            peak_decay_nrg[i] = FFMAX(decayed_peak, power[i][n]);            power_smooth[i] += (power[i][n] + 2LL - power_smooth[i]) >> 2;            peak_decay_diff_smooth[i] += (peak_decay_nrg[i] + 2LL - power[i][n] - \                                          peak_decay_diff_smooth[i]) >> 2;             if (peak_decay_diff_smooth[i]) {                transient_gain[i][n] = FFMIN(power_smooth[i]*43691LL / peak_decay_diff_smooth[i], 1<<16);            } else                transient_gain[i][n] = 1 << 16;        }    }#else    for (i = 0; i < NR_PAR_BANDS[is34]; i++) {        for (n = n0; n < nL; n++) {            float decayed_peak = peak_decay_factor * peak_decay_nrg[i];            float denom;            peak_decay_nrg[i] = FFMAX(decayed_peak, power[i][n]);            power_smooth[i] += a_smooth * (power[i][n] - power_smooth[i]);            peak_decay_diff_smooth[i] += a_smooth * (peak_decay_nrg[i] - power[i][n] - peak_decay_diff_smooth[i]);            denom = transient_impact * peak_decay_diff_smooth[i];            transient_gain[i][n]   = (denom > power_smooth[i]) ?                                         power_smooth[i] / denom : 1.0f;        }    } #endif /* USE_FIXED */    //Decorrelation and transient reduction    //                         PS_AP_LINKS - 1    //                               -----    //                                | |  Q_fract_allpass[k][m]*z^-link_delay[m] - a[m]*g_decay_slope[k]    //H[k][z] = z^-2 * phi_fract[k] * | | ----------------------------------------------------------------    //                                | | 1 - a[m]*g_decay_slope[k]*Q_fract_allpass[k][m]*z^-link_delay[m]    //                               m = 0    //d[k][z] (out) = transient_gain_mapped[k][z] * H[k][z] * s[k][z]    for (k = 0; k < NR_ALLPASS_BANDS[is34]; k++) {        int b = k_to_i[k];#if USE_FIXED        int g_decay_slope;         if (k - DECAY_CUTOFF[is34] <= 0) {          g_decay_slope = 1 << 30;        }        else if (k - DECAY_CUTOFF[is34] >= 20) {          g_decay_slope = 0;        }        else {          g_decay_slope = (1 << 30) - DECAY_SLOPE * (k - DECAY_CUTOFF[is34]);        }#else        float g_decay_slope = 1.f - DECAY_SLOPE * (k - DECAY_CUTOFF[is34]);        g_decay_slope = av_clipf(g_decay_slope, 0.f, 1.f);#endif /* USE_FIXED */        memcpy(delay[k], delay[k]+nL, PS_MAX_DELAY*sizeof(delay[k][0]));        memcpy(delay[k]+PS_MAX_DELAY, s[k], numQMFSlots*sizeof(delay[k][0]));        for (m = 0; m < PS_AP_LINKS; m++) {            memcpy(ap_delay[k][m],   ap_delay[k][m]+numQMFSlots,           5*sizeof(ap_delay[k][m][0]));        }        ps->dsp.decorrelate(out[k], delay[k] + PS_MAX_DELAY - 2, ap_delay[k],                            phi_fract[is34][k],                            (const INTFLOAT (*)[2]) Q_fract_allpass[is34][k],                            transient_gain[b], g_decay_slope, nL - n0);    }

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