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  1. /*
  2.  * Copyright (c) 2015 Peter Meerwald <pmeerw@pmeerw.net>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "g722dsp.h"
  22. #include "mathops.h"
  23.  
  24. /*
  25.  * quadrature mirror filter (QMF) coefficients (ITU-T G.722 Table 11) inlined
  26.  * in code below: 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11
  27.  */
  28.  
  29. static void g722_apply_qmf(const int16_t *prev_samples, int xout[2])
  30. {
  31.     xout[1] = MUL16(*prev_samples++, 3);
  32.     xout[0] = MUL16(*prev_samples++, -11);
  33.  
  34.     MAC16(xout[1], *prev_samples++, -11);
  35.     MAC16(xout[0], *prev_samples++, 53);
  36.  
  37.     MAC16(xout[1], *prev_samples++, 12);
  38.     MAC16(xout[0], *prev_samples++, -156);
  39.  
  40.     MAC16(xout[1], *prev_samples++, 32);
  41.     MAC16(xout[0], *prev_samples++, 362);
  42.  
  43.     MAC16(xout[1], *prev_samples++, -210);
  44.     MAC16(xout[0], *prev_samples++, -805);
  45.  
  46.     MAC16(xout[1], *prev_samples++, 951);
  47.     MAC16(xout[0], *prev_samples++, 3876);
  48.  
  49.     MAC16(xout[1], *prev_samples++, 3876);
  50.     MAC16(xout[0], *prev_samples++, 951);
  51.  
  52.     MAC16(xout[1], *prev_samples++, -805);
  53.     MAC16(xout[0], *prev_samples++, -210);
  54.  
  55.     MAC16(xout[1], *prev_samples++, 362);
  56.     MAC16(xout[0], *prev_samples++, 32);
  57.  
  58.     MAC16(xout[1], *prev_samples++, -156);
  59.     MAC16(xout[0], *prev_samples++, 12);
  60.  
  61.     MAC16(xout[1], *prev_samples++, 53);
  62.     MAC16(xout[0], *prev_samples++, -11);
  63.  
  64.     MAC16(xout[1], *prev_samples++, -11);
  65.     MAC16(xout[0], *prev_samples++, 3);
  66. }
  67.  
  68. av_cold void ff_g722dsp_init(G722DSPContext *c)
  69. {
  70.     c->apply_qmf = g722_apply_qmf;
  71.  
  72.     if (ARCH_ARM)
  73.         ff_g722dsp_init_arm(c);
  74.     if (ARCH_X86)
  75.         ff_g722dsp_init_x86(c);
  76. }
  77.