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diff --git a/audio_codec/libfaad/sbr_qmf.c b/audio_codec/libfaad/sbr_qmf.c new file mode 100644 index 0000000..0131a39 --- a/dev/null +++ b/audio_codec/libfaad/sbr_qmf.c @@ -0,0 +1,614 @@ +/* +** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding +** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com +** +** This program is free software; you can redistribute it and/or modify +** it under the terms of the GNU General Public License as published by +** the Free Software Foundation; either version 2 of the License, or +** (at your option) any later version. +** +** This program 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 General Public License for more details. +** +** You should have received a copy of the GNU General Public License +** along with this program; if not, write to the Free Software +** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +** +** Any non-GPL usage of this software or parts of this software is strictly +** forbidden. +** +** The "appropriate copyright message" mentioned in section 2c of the GPLv2 +** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com" +** +** Commercial non-GPL licensing of this software is possible. +** For more info contact Nero AG through Mpeg4AAClicense@nero.com. +** +** $Id: sbr_qmf.c,v 1.32 2007/11/01 12:33:36 menno Exp $ +**/ +#include <stdlib.h> +#include "common.h" +#include "structs.h" + +#ifdef SBR_DEC + + +#include <string.h> +#include "sbr_dct.h" +#include "sbr_qmf.h" +#include "sbr_qmf_c.h" +#include "sbr_syntax.h" + +qmfa_info *qmfa_init(uint8_t channels) +{ + qmfa_info *qmfa = (qmfa_info*)faad_malloc(sizeof(qmfa_info)); + + /* x is implemented as double ringbuffer */ + qmfa->x = (real_t*)faad_malloc(2 * channels * 10 * sizeof(real_t)); + memset(qmfa->x, 0, 2 * channels * 10 * sizeof(real_t)); + + /* ringbuffer index */ + qmfa->x_index = 0; + + qmfa->channels = channels; + + return qmfa; +} + +void qmfa_end(qmfa_info *qmfa) +{ + if (qmfa) { + if (qmfa->x) { + faad_free(qmfa->x); + } + faad_free(qmfa); + } +} + +void sbr_qmf_analysis_32(sbr_info *sbr, qmfa_info *qmfa, const real_t *input, + qmf_t X[MAX_NTSRHFG][64], uint8_t offset, uint8_t kx) +{ + ALIGN real_t u[64]; +#ifndef SBR_LOW_POWER + ALIGN real_t in_real[32], in_imag[32], out_real[32], out_imag[32]; +#else + ALIGN real_t y[32]; +#endif + uint32_t in = 0; + uint8_t l; + + /* qmf subsample l */ + for (l = 0; l < sbr->numTimeSlotsRate; l++) { + int16_t n; + + /* shift input buffer x */ + /* input buffer is not shifted anymore, x is implemented as double ringbuffer */ + //memmove(qmfa->x + 32, qmfa->x, (320-32)*sizeof(real_t)); + + /* add new samples to input buffer x */ + for (n = 32 - 1; n >= 0; n--) { +#ifdef FIXED_POINT + qmfa->x[qmfa->x_index + n] = qmfa->x[qmfa->x_index + n + 320] = (input[in++]) >> 4; +#else + qmfa->x[qmfa->x_index + n] = qmfa->x[qmfa->x_index + n + 320] = input[in++]; +#endif + } + + /* window and summation to create array u */ + for (n = 0; n < 64; n++) { + u[n] = MUL_F(qmfa->x[qmfa->x_index + n], qmf_c[2 * n]) + + MUL_F(qmfa->x[qmfa->x_index + n + 64], qmf_c[2 * (n + 64)]) + + MUL_F(qmfa->x[qmfa->x_index + n + 128], qmf_c[2 * (n + 128)]) + + MUL_F(qmfa->x[qmfa->x_index + n + 192], qmf_c[2 * (n + 192)]) + + MUL_F(qmfa->x[qmfa->x_index + n + 256], qmf_c[2 * (n + 256)]); + } + + /* update ringbuffer index */ + qmfa->x_index -= 32; + if (qmfa->x_index < 0) { + qmfa->x_index = (320 - 32); + } + + /* calculate 32 subband samples by introducing X */ +#ifdef SBR_LOW_POWER + y[0] = u[48]; + for (n = 1; n < 16; n++) { + y[n] = u[n + 48] + u[48 - n]; + } + for (n = 16; n < 32; n++) { + y[n] = -u[n - 16] + u[48 - n]; + } + + DCT3_32_unscaled(u, y); + + for (n = 0; n < 32; n++) { + if (n < kx) { +#ifdef FIXED_POINT + QMF_RE(X[l + offset][n]) = u[n] /*<< 1*/; +#else + QMF_RE(X[l + offset][n]) = 2. * u[n]; +#endif + } else { + QMF_RE(X[l + offset][n]) = 0; + } + } +#else + + // Reordering of data moved from DCT_IV to here + in_imag[31] = u[1]; + in_real[0] = u[0]; + for (n = 1; n < 31; n++) { + in_imag[31 - n] = u[n + 1]; + in_real[n] = -u[64 - n]; + } + in_imag[0] = u[32]; + in_real[31] = -u[33]; + + // dct4_kernel is DCT_IV without reordering which is done before and after FFT + dct4_kernel(in_real, in_imag, out_real, out_imag); + + // Reordering of data moved from DCT_IV to here + for (n = 0; n < 16; n++) { + if (2 * n + 1 < kx) { +#ifdef FIXED_POINT + QMF_RE(X[l + offset][2 * n]) = out_real[n]; + QMF_IM(X[l + offset][2 * n]) = out_imag[n]; + QMF_RE(X[l + offset][2 * n + 1]) = -out_imag[31 - n]; + QMF_IM(X[l + offset][2 * n + 1]) = -out_real[31 - n]; +#else + QMF_RE(X[l + offset][2 * n]) = 2. * out_real[n]; + QMF_IM(X[l + offset][2 * n]) = 2. * out_imag[n]; + QMF_RE(X[l + offset][2 * n + 1]) = -2. * out_imag[31 - n]; + QMF_IM(X[l + offset][2 * n + 1]) = -2. * out_real[31 - n]; +#endif + } else { + if (2 * n < kx) { +#ifdef FIXED_POINT + QMF_RE(X[l + offset][2 * n]) = out_real[n]; + QMF_IM(X[l + offset][2 * n]) = out_imag[n]; +#else + QMF_RE(X[l + offset][2 * n]) = 2. * out_real[n]; + QMF_IM(X[l + offset][2 * n]) = 2. * out_imag[n]; +#endif + } else { + QMF_RE(X[l + offset][2 * n]) = 0; + QMF_IM(X[l + offset][2 * n]) = 0; + } + QMF_RE(X[l + offset][2 * n + 1]) = 0; + QMF_IM(X[l + offset][2 * n + 1]) = 0; + } + } +#endif + } +} + +static const complex_t qmf32_pre_twiddle[] = { + { FRAC_CONST(0.999924701839145), FRAC_CONST(-0.012271538285720) }, + { FRAC_CONST(0.999322384588350), FRAC_CONST(-0.036807222941359) }, + { FRAC_CONST(0.998118112900149), FRAC_CONST(-0.061320736302209) }, + { FRAC_CONST(0.996312612182778), FRAC_CONST(-0.085797312344440) }, + { FRAC_CONST(0.993906970002356), FRAC_CONST(-0.110222207293883) }, + { FRAC_CONST(0.990902635427780), FRAC_CONST(-0.134580708507126) }, + { FRAC_CONST(0.987301418157858), FRAC_CONST(-0.158858143333861) }, + { FRAC_CONST(0.983105487431216), FRAC_CONST(-0.183039887955141) }, + { FRAC_CONST(0.978317370719628), FRAC_CONST(-0.207111376192219) }, + { FRAC_CONST(0.972939952205560), FRAC_CONST(-0.231058108280671) }, + { FRAC_CONST(0.966976471044852), FRAC_CONST(-0.254865659604515) }, + { FRAC_CONST(0.960430519415566), FRAC_CONST(-0.278519689385053) }, + { FRAC_CONST(0.953306040354194), FRAC_CONST(-0.302005949319228) }, + { FRAC_CONST(0.945607325380521), FRAC_CONST(-0.325310292162263) }, + { FRAC_CONST(0.937339011912575), FRAC_CONST(-0.348418680249435) }, + { FRAC_CONST(0.928506080473216), FRAC_CONST(-0.371317193951838) }, + { FRAC_CONST(0.919113851690058), FRAC_CONST(-0.393992040061048) }, + { FRAC_CONST(0.909167983090522), FRAC_CONST(-0.416429560097637) }, + { FRAC_CONST(0.898674465693954), FRAC_CONST(-0.438616238538528) }, + { FRAC_CONST(0.887639620402854), FRAC_CONST(-0.460538710958240) }, + { FRAC_CONST(0.876070094195407), FRAC_CONST(-0.482183772079123) }, + { FRAC_CONST(0.863972856121587), FRAC_CONST(-0.503538383725718) }, + { FRAC_CONST(0.851355193105265), FRAC_CONST(-0.524589682678469) }, + { FRAC_CONST(0.838224705554838), FRAC_CONST(-0.545324988422046) }, + { FRAC_CONST(0.824589302785025), FRAC_CONST(-0.565731810783613) }, + { FRAC_CONST(0.810457198252595), FRAC_CONST(-0.585797857456439) }, + { FRAC_CONST(0.795836904608884), FRAC_CONST(-0.605511041404326) }, + { FRAC_CONST(0.780737228572094), FRAC_CONST(-0.624859488142386) }, + { FRAC_CONST(0.765167265622459), FRAC_CONST(-0.643831542889791) }, + { FRAC_CONST(0.749136394523459), FRAC_CONST(-0.662415777590172) }, + { FRAC_CONST(0.732654271672413), FRAC_CONST(-0.680600997795453) }, + { FRAC_CONST(0.715730825283819), FRAC_CONST(-0.698376249408973) } +}; + +qmfs_info *qmfs_init(uint8_t channels) +{ + qmfs_info *qmfs = (qmfs_info*)faad_malloc(sizeof(qmfs_info)); + + /* v is a double ringbuffer */ + qmfs->v = (real_t*)faad_malloc(2 * channels * 20 * sizeof(real_t)); + memset(qmfs->v, 0, 2 * channels * 20 * sizeof(real_t)); + + qmfs->v_index = 0; + + qmfs->channels = channels; + + return qmfs; +} + +void qmfs_end(qmfs_info *qmfs) +{ + if (qmfs) { + if (qmfs->v) { + faad_free(qmfs->v); + } + faad_free(qmfs); + } +} + +#ifdef SBR_LOW_POWER + +void sbr_qmf_synthesis_32(sbr_info *sbr, qmfs_info *qmfs, qmf_t X[MAX_NTSRHFG][64], + real_t *output) +{ + ALIGN real_t x[16]; + ALIGN real_t y[16]; + int32_t n, k, out = 0; + uint8_t l; + + /* qmf subsample l */ + for (l = 0; l < sbr->numTimeSlotsRate; l++) { + /* shift buffers */ + /* we are not shifting v, it is a double ringbuffer */ + //memmove(qmfs->v + 64, qmfs->v, (640-64)*sizeof(real_t)); + + /* calculate 64 samples */ + for (k = 0; k < 16; k++) { +#ifdef FIXED_POINT + y[k] = (QMF_RE(X[l][k]) - QMF_RE(X[l][31 - k])); + x[k] = (QMF_RE(X[l][k]) + QMF_RE(X[l][31 - k])); +#else + y[k] = (QMF_RE(X[l][k]) - QMF_RE(X[l][31 - k])) / 32.0; + x[k] = (QMF_RE(X[l][k]) + QMF_RE(X[l][31 - k])) / 32.0; +#endif + } + + /* even n samples */ + DCT2_16_unscaled(x, x); + /* odd n samples */ + DCT4_16(y, y); + + for (n = 8; n < 24; n++) { + qmfs->v[qmfs->v_index + n * 2] = qmfs->v[qmfs->v_index + 640 + n * 2] = x[n - 8]; + qmfs->v[qmfs->v_index + n * 2 + 1] = qmfs->v[qmfs->v_index + 640 + n * 2 + 1] = y[n - 8]; + } + for (n = 0; n < 16; n++) { + qmfs->v[qmfs->v_index + n] = qmfs->v[qmfs->v_index + 640 + n] = qmfs->v[qmfs->v_index + 32 - n]; + } + qmfs->v[qmfs->v_index + 48] = qmfs->v[qmfs->v_index + 640 + 48] = 0; + for (n = 1; n < 16; n++) { + qmfs->v[qmfs->v_index + 48 + n] = qmfs->v[qmfs->v_index + 640 + 48 + n] = -qmfs->v[qmfs->v_index + 48 - n]; + } + + /* calculate 32 output samples and window */ + for (k = 0; k < 32; k++) { + output[out++] = MUL_F(qmfs->v[qmfs->v_index + k], qmf_c[2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 96 + k], qmf_c[64 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 128 + k], qmf_c[128 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 224 + k], qmf_c[192 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 256 + k], qmf_c[256 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 352 + k], qmf_c[320 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 384 + k], qmf_c[384 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 480 + k], qmf_c[448 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 512 + k], qmf_c[512 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 608 + k], qmf_c[576 + 2 * k]); + } + + /* update the ringbuffer index */ + qmfs->v_index -= 64; + if (qmfs->v_index < 0) { + qmfs->v_index = (640 - 64); + } + } +} + +void sbr_qmf_synthesis_64(sbr_info *sbr, qmfs_info *qmfs, qmf_t X[MAX_NTSRHFG][64], + real_t *output) +{ + ALIGN real_t x[64]; + ALIGN real_t y[64]; + int32_t n, k, out = 0; + uint8_t l; + + + /* qmf subsample l */ + for (l = 0; l < sbr->numTimeSlotsRate; l++) { + /* shift buffers */ + /* we are not shifting v, it is a double ringbuffer */ + //memmove(qmfs->v + 128, qmfs->v, (1280-128)*sizeof(real_t)); + + /* calculate 128 samples */ + for (k = 0; k < 32; k++) { +#ifdef FIXED_POINT + y[k] = (QMF_RE(X[l][k]) - QMF_RE(X[l][63 - k])); + x[k] = (QMF_RE(X[l][k]) + QMF_RE(X[l][63 - k])); +#else + y[k] = (QMF_RE(X[l][k]) - QMF_RE(X[l][63 - k])) / 32.0; + x[k] = (QMF_RE(X[l][k]) + QMF_RE(X[l][63 - k])) / 32.0; +#endif + } + + /* even n samples */ + DCT2_32_unscaled(x, x); + /* odd n samples */ + DCT4_32(y, y); + + for (n = 16; n < 48; n++) { + qmfs->v[qmfs->v_index + n * 2] = qmfs->v[qmfs->v_index + 1280 + n * 2] = x[n - 16]; + qmfs->v[qmfs->v_index + n * 2 + 1] = qmfs->v[qmfs->v_index + 1280 + n * 2 + 1] = y[n - 16]; + } + for (n = 0; n < 32; n++) { + qmfs->v[qmfs->v_index + n] = qmfs->v[qmfs->v_index + 1280 + n] = qmfs->v[qmfs->v_index + 64 - n]; + } + qmfs->v[qmfs->v_index + 96] = qmfs->v[qmfs->v_index + 1280 + 96] = 0; + for (n = 1; n < 32; n++) { + qmfs->v[qmfs->v_index + 96 + n] = qmfs->v[qmfs->v_index + 1280 + 96 + n] = -qmfs->v[qmfs->v_index + 96 - n]; + } + + /* calculate 64 output samples and window */ + for (k = 0; k < 64; k++) { + output[out++] = MUL_F(qmfs->v[qmfs->v_index + k], qmf_c[k]) + + MUL_F(qmfs->v[qmfs->v_index + 192 + k], qmf_c[64 + k]) + + MUL_F(qmfs->v[qmfs->v_index + 256 + k], qmf_c[128 + k]) + + MUL_F(qmfs->v[qmfs->v_index + 256 + 192 + k], qmf_c[128 + 64 + k]) + + MUL_F(qmfs->v[qmfs->v_index + 512 + k], qmf_c[256 + k]) + + MUL_F(qmfs->v[qmfs->v_index + 512 + 192 + k], qmf_c[256 + 64 + k]) + + MUL_F(qmfs->v[qmfs->v_index + 768 + k], qmf_c[384 + k]) + + MUL_F(qmfs->v[qmfs->v_index + 768 + 192 + k], qmf_c[384 + 64 + k]) + + MUL_F(qmfs->v[qmfs->v_index + 1024 + k], qmf_c[512 + k]) + + MUL_F(qmfs->v[qmfs->v_index + 1024 + 192 + k], qmf_c[512 + 64 + k]); + } + + /* update the ringbuffer index */ + qmfs->v_index -= 128; + if (qmfs->v_index < 0) { + qmfs->v_index = (1280 - 128); + } + } +} +#else +void sbr_qmf_synthesis_32(sbr_info *sbr, qmfs_info *qmfs, qmf_t X[MAX_NTSRHFG][64], + real_t *output) +{ + ALIGN real_t x1[32], x2[32]; +#ifndef FIXED_POINT + real_t scale = 1.f / 64.f; +#endif + int32_t n, k, out = 0; + uint8_t l; + + + /* qmf subsample l */ + for (l = 0; l < sbr->numTimeSlotsRate; l++) { + /* shift buffer v */ + /* buffer is not shifted, we are using a ringbuffer */ + //memmove(qmfs->v + 64, qmfs->v, (640-64)*sizeof(real_t)); + + /* calculate 64 samples */ + /* complex pre-twiddle */ + for (k = 0; k < 32; k++) { + x1[k] = MUL_F(QMF_RE(X[l][k]), RE(qmf32_pre_twiddle[k])) - MUL_F(QMF_IM(X[l][k]), IM(qmf32_pre_twiddle[k])); + x2[k] = MUL_F(QMF_IM(X[l][k]), RE(qmf32_pre_twiddle[k])) + MUL_F(QMF_RE(X[l][k]), IM(qmf32_pre_twiddle[k])); + +#ifndef FIXED_POINT + x1[k] *= scale; + x2[k] *= scale; +#else + x1[k] >>= 1; + x2[k] >>= 1; +#endif + } + + /* transform */ + DCT4_32(x1, x1); + DST4_32(x2, x2); + + for (n = 0; n < 32; n++) { + qmfs->v[qmfs->v_index + n] = qmfs->v[qmfs->v_index + 640 + n] = -x1[n] + x2[n]; + qmfs->v[qmfs->v_index + 63 - n] = qmfs->v[qmfs->v_index + 640 + 63 - n] = x1[n] + x2[n]; + } + + /* calculate 32 output samples and window */ + for (k = 0; k < 32; k++) { + output[out++] = MUL_F(qmfs->v[qmfs->v_index + k], qmf_c[2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 96 + k], qmf_c[64 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 128 + k], qmf_c[128 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 224 + k], qmf_c[192 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 256 + k], qmf_c[256 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 352 + k], qmf_c[320 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 384 + k], qmf_c[384 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 480 + k], qmf_c[448 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 512 + k], qmf_c[512 + 2 * k]) + + MUL_F(qmfs->v[qmfs->v_index + 608 + k], qmf_c[576 + 2 * k]); + } + + /* update ringbuffer index */ + qmfs->v_index -= 64; + if (qmfs->v_index < 0) { + qmfs->v_index = (640 - 64); + } + } +} + +void sbr_qmf_synthesis_64(sbr_info *sbr, qmfs_info *qmfs, qmf_t X[MAX_NTSRHFG][64], + real_t *output) +{ + // ALIGN real_t x1[64], x2[64]; +#ifndef SBR_LOW_POWER + ALIGN real_t in_real1[32], in_imag1[32], out_real1[32], out_imag1[32]; + ALIGN real_t in_real2[32], in_imag2[32], out_real2[32], out_imag2[32]; +#endif + qmf_t * pX; + real_t * pring_buffer_1, * pring_buffer_3; + // real_t * ptemp_1, * ptemp_2; +#ifdef PREFER_POINTERS + // These pointers are used if target platform has autoinc address generators + real_t * pring_buffer_2, * pring_buffer_4; + real_t * pring_buffer_5, * pring_buffer_6; + real_t * pring_buffer_7, * pring_buffer_8; + real_t * pring_buffer_9, * pring_buffer_10; + const real_t * pqmf_c_1, * pqmf_c_2, * pqmf_c_3, * pqmf_c_4; + const real_t * pqmf_c_5, * pqmf_c_6, * pqmf_c_7, * pqmf_c_8; + const real_t * pqmf_c_9, * pqmf_c_10; +#endif // #ifdef PREFER_POINTERS +#ifndef FIXED_POINT + real_t scale = 1.f / 64.f; +#endif + int32_t n, k, out = 0; + uint8_t l; + + + /* qmf subsample l */ + for (l = 0; l < sbr->numTimeSlotsRate; l++) { + /* shift buffer v */ + /* buffer is not shifted, we use double ringbuffer */ + //memmove(qmfs->v + 128, qmfs->v, (1280-128)*sizeof(real_t)); + + /* calculate 128 samples */ +#ifndef FIXED_POINT + + pX = X[l]; + + in_imag1[31] = scale * QMF_RE(pX[1]); + in_real1[0] = scale * QMF_RE(pX[0]); + in_imag2[31] = scale * QMF_IM(pX[63 - 1]); + in_real2[0] = scale * QMF_IM(pX[63 - 0]); + for (k = 1; k < 31; k++) { + in_imag1[31 - k] = scale * QMF_RE(pX[2 * k + 1]); + in_real1[ k] = scale * QMF_RE(pX[2 * k ]); + in_imag2[31 - k] = scale * QMF_IM(pX[63 - (2 * k + 1)]); + in_real2[ k] = scale * QMF_IM(pX[63 - (2 * k)]); + } + in_imag1[0] = scale * QMF_RE(pX[63]); + in_real1[31] = scale * QMF_RE(pX[62]); + in_imag2[0] = scale * QMF_IM(pX[63 - 63]); + in_real2[31] = scale * QMF_IM(pX[63 - 62]); + +#else + + pX = X[l]; + + in_imag1[31] = QMF_RE(pX[1]) >> 1; + in_real1[0] = QMF_RE(pX[0]) >> 1; + in_imag2[31] = QMF_IM(pX[62]) >> 1; + in_real2[0] = QMF_IM(pX[63]) >> 1; + for (k = 1; k < 31; k++) { + in_imag1[31 - k] = QMF_RE(pX[2 * k + 1]) >> 1; + in_real1[ k] = QMF_RE(pX[2 * k ]) >> 1; + in_imag2[31 - k] = QMF_IM(pX[63 - (2 * k + 1)]) >> 1; + in_real2[ k] = QMF_IM(pX[63 - (2 * k)]) >> 1; + } + in_imag1[0] = QMF_RE(pX[63]) >> 1; + in_real1[31] = QMF_RE(pX[62]) >> 1; + in_imag2[0] = QMF_IM(pX[0]) >> 1; + in_real2[31] = QMF_IM(pX[1]) >> 1; + +#endif + + + // dct4_kernel is DCT_IV without reordering which is done before and after FFT + dct4_kernel(in_real1, in_imag1, out_real1, out_imag1); + dct4_kernel(in_real2, in_imag2, out_real2, out_imag2); + + + pring_buffer_1 = qmfs->v + qmfs->v_index; + pring_buffer_3 = pring_buffer_1 + 1280; +#ifdef PREFER_POINTERS + pring_buffer_2 = pring_buffer_1 + 127; + pring_buffer_4 = pring_buffer_1 + (1280 + 127); +#endif // #ifdef PREFER_POINTERS + // ptemp_1 = x1; + // ptemp_2 = x2; +#ifdef PREFER_POINTERS + for (n = 0; n < 32; n ++) { + //real_t x1 = *ptemp_1++; + //real_t x2 = *ptemp_2++; + // pring_buffer_3 and pring_buffer_4 are needed only for double ring buffer + *pring_buffer_1++ = *pring_buffer_3++ = out_real2[n] - out_real1[n]; + *pring_buffer_2-- = *pring_buffer_4-- = out_real2[n] + out_real1[n]; + //x1 = *ptemp_1++; + //x2 = *ptemp_2++; + *pring_buffer_1++ = *pring_buffer_3++ = out_imag2[31 - n] + out_imag1[31 - n]; + *pring_buffer_2-- = *pring_buffer_4-- = out_imag2[31 - n] - out_imag1[31 - n]; + } +#else // #ifdef PREFER_POINTERS + + for (n = 0; n < 32; n++) { + // pring_buffer_3 and pring_buffer_4 are needed only for double ring buffer + pring_buffer_1[2 * n] = pring_buffer_3[2 * n] = out_real2[n] - out_real1[n]; + pring_buffer_1[127 - 2 * n] = pring_buffer_3[127 - 2 * n] = out_real2[n] + out_real1[n]; + pring_buffer_1[2 * n + 1] = pring_buffer_3[2 * n + 1] = out_imag2[31 - n] + out_imag1[31 - n]; + pring_buffer_1[127 - (2 * n + 1)] = pring_buffer_3[127 - (2 * n + 1)] = out_imag2[31 - n] - out_imag1[31 - n]; + } + +#endif // #ifdef PREFER_POINTERS + + pring_buffer_1 = qmfs->v + qmfs->v_index; +#ifdef PREFER_POINTERS + pring_buffer_2 = pring_buffer_1 + 192; + pring_buffer_3 = pring_buffer_1 + 256; + pring_buffer_4 = pring_buffer_1 + (256 + 192); + pring_buffer_5 = pring_buffer_1 + 512; + pring_buffer_6 = pring_buffer_1 + (512 + 192); + pring_buffer_7 = pring_buffer_1 + 768; + pring_buffer_8 = pring_buffer_1 + (768 + 192); + pring_buffer_9 = pring_buffer_1 + 1024; + pring_buffer_10 = pring_buffer_1 + (1024 + 192); + pqmf_c_1 = qmf_c; + pqmf_c_2 = qmf_c + 64; + pqmf_c_3 = qmf_c + 128; + pqmf_c_4 = qmf_c + 192; + pqmf_c_5 = qmf_c + 256; + pqmf_c_6 = qmf_c + 320; + pqmf_c_7 = qmf_c + 384; + pqmf_c_8 = qmf_c + 448; + pqmf_c_9 = qmf_c + 512; + pqmf_c_10 = qmf_c + 576; +#endif // #ifdef PREFER_POINTERS + + /* calculate 64 output samples and window */ + for (k = 0; k < 64; k++) { +#ifdef PREFER_POINTERS + output[out++] = + MUL_F(*pring_buffer_1++, *pqmf_c_1++) + + MUL_F(*pring_buffer_2++, *pqmf_c_2++) + + MUL_F(*pring_buffer_3++, *pqmf_c_3++) + + MUL_F(*pring_buffer_4++, *pqmf_c_4++) + + MUL_F(*pring_buffer_5++, *pqmf_c_5++) + + MUL_F(*pring_buffer_6++, *pqmf_c_6++) + + MUL_F(*pring_buffer_7++, *pqmf_c_7++) + + MUL_F(*pring_buffer_8++, *pqmf_c_8++) + + MUL_F(*pring_buffer_9++, *pqmf_c_9++) + + MUL_F(*pring_buffer_10++, *pqmf_c_10++); +#else // #ifdef PREFER_POINTERS + output[out++] = + MUL_F(pring_buffer_1[k + 0], qmf_c[k + 0]) + + MUL_F(pring_buffer_1[k + 192], qmf_c[k + 64]) + + MUL_F(pring_buffer_1[k + 256], qmf_c[k + 128]) + + MUL_F(pring_buffer_1[k + (256 + 192)], qmf_c[k + 192]) + + MUL_F(pring_buffer_1[k + 512], qmf_c[k + 256]) + + MUL_F(pring_buffer_1[k + (512 + 192)], qmf_c[k + 320]) + + MUL_F(pring_buffer_1[k + 768], qmf_c[k + 384]) + + MUL_F(pring_buffer_1[k + (768 + 192)], qmf_c[k + 448]) + + MUL_F(pring_buffer_1[k + 1024], qmf_c[k + 512]) + + MUL_F(pring_buffer_1[k + (1024 + 192)], qmf_c[k + 576]); +#endif // #ifdef PREFER_POINTERS + } + + /* update ringbuffer index */ + qmfs->v_index -= 128; + if (qmfs->v_index < 0) { + qmfs->v_index = (1280 - 128); + } + } +} +#endif + +#endif |