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  1. /*
  2.  * Copyright (c) 2004 Gildas Bazin
  3.  * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "config.h"
  23. #include "libavutil/attributes.h"
  24. #include "libavutil/intreadwrite.h"
  25. #include "dcadsp.h"
  26.  
  27. static void dca_lfe_fir_c(float *out, const float *in, const float *coefs,
  28.                           int decifactor, float scale)
  29. {
  30.     float *out2 = out + decifactor;
  31.     const float *cf0 = coefs;
  32.     const float *cf1 = coefs + 256;
  33.     int j, k;
  34.  
  35.     /* One decimated sample generates 2*decifactor interpolated ones */
  36.     for (k = 0; k < decifactor; k++) {
  37.         float v0 = 0.0;
  38.         float v1 = 0.0;
  39.         for (j = 0; j < 256 / decifactor; j++) {
  40.             float s = in[-j];
  41.             v0 += s * *cf0++;
  42.             v1 += s * *--cf1;
  43.         }
  44.         *out++  = v0 * scale;
  45.         *out2++ = v1 * scale;
  46.     }
  47. }
  48.  
  49. static void dca_qmf_32_subbands(float samples_in[32][8], int sb_act,
  50.                                 SynthFilterContext *synth, FFTContext *imdct,
  51.                                 float synth_buf_ptr[512],
  52.                                 int *synth_buf_offset, float synth_buf2[32],
  53.                                 const float window[512], float *samples_out,
  54.                                 float raXin[32], float scale)
  55. {
  56.     int i;
  57.     int subindex;
  58.  
  59.     for (i = sb_act; i < 32; i++)
  60.         raXin[i] = 0.0;
  61.  
  62.     /* Reconstructed channel sample index */
  63.     for (subindex = 0; subindex < 8; subindex++) {
  64.         /* Load in one sample from each subband and clear inactive subbands */
  65.         for (i = 0; i < sb_act; i++) {
  66.             unsigned sign = (i - 1) & 2;
  67.             uint32_t v    = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30;
  68.             AV_WN32A(&raXin[i], v);
  69.         }
  70.  
  71.         synth->synth_filter_float(imdct, synth_buf_ptr, synth_buf_offset,
  72.                                   synth_buf2, window, samples_out, raXin, scale);
  73.         samples_out += 32;
  74.     }
  75. }
  76.  
  77. av_cold void ff_dcadsp_init(DCADSPContext *s)
  78. {
  79.     s->lfe_fir = dca_lfe_fir_c;
  80.     s->qmf_32_subbands = dca_qmf_32_subbands;
  81.     if (ARCH_ARM) ff_dcadsp_init_arm(s);
  82. }
  83.