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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.  
  24. #include "libavutil/attributes.h"
  25. #include "libavutil/intreadwrite.h"
  26.  
  27. #include "dcadsp.h"
  28.  
  29. static void decode_hf_c(float dst[DCA_SUBBANDS][8],
  30.                         const int32_t vq_num[DCA_SUBBANDS],
  31.                         const int8_t hf_vq[1024][32], intptr_t vq_offset,
  32.                         int32_t scale[DCA_SUBBANDS][2],
  33.                         intptr_t start, intptr_t end)
  34. {
  35.     int i, l;
  36.  
  37.     for (l = start; l < end; l++) {
  38.         /* 1 vector -> 32 samples but we only need the 8 samples
  39.          * for this subsubframe. */
  40.         const int8_t *ptr = &hf_vq[vq_num[l]][vq_offset];
  41.         float fscale = scale[l][0] * (1 / 16.0);
  42.         for (i = 0; i < 8; i++)
  43.             dst[l][i] = ptr[i] * fscale;
  44.     }
  45. }
  46.  
  47. static inline void dca_lfe_fir(float *out, const float *in, const float *coefs,
  48.                                int decifactor)
  49. {
  50.     float *out2    = out + 2 * decifactor - 1;
  51.     int num_coeffs = 256 / decifactor;
  52.     int j, k;
  53.  
  54.     /* One decimated sample generates 2*decifactor interpolated ones */
  55.     for (k = 0; k < decifactor; k++) {
  56.         float v0 = 0.0;
  57.         float v1 = 0.0;
  58.         for (j = 0; j < num_coeffs; j++, coefs++) {
  59.             v0 += in[-j]                 * *coefs;
  60.             v1 += in[j + 1 - num_coeffs] * *coefs;
  61.         }
  62.         *out++  = v0;
  63.         *out2-- = v1;
  64.     }
  65. }
  66.  
  67. static void dca_qmf_32_subbands(float samples_in[32][8], int sb_act,
  68.                                 SynthFilterContext *synth, FFTContext *imdct,
  69.                                 float synth_buf_ptr[512],
  70.                                 int *synth_buf_offset, float synth_buf2[32],
  71.                                 const float window[512], float *samples_out,
  72.                                 float raXin[32], float scale)
  73. {
  74.     int i;
  75.     int subindex;
  76.  
  77.     for (i = sb_act; i < 32; i++)
  78.         raXin[i] = 0.0;
  79.  
  80.     /* Reconstructed channel sample index */
  81.     for (subindex = 0; subindex < 8; subindex++) {
  82.         /* Load in one sample from each subband and clear inactive subbands */
  83.         for (i = 0; i < sb_act; i++) {
  84.             unsigned sign = (i - 1) & 2;
  85.             uint32_t v    = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30;
  86.             AV_WN32A(&raXin[i], v);
  87.         }
  88.  
  89.         synth->synth_filter_float(imdct, synth_buf_ptr, synth_buf_offset,
  90.                                   synth_buf2, window, samples_out, raXin,
  91.                                   scale);
  92.         samples_out += 32;
  93.     }
  94. }
  95.  
  96. static void dca_lfe_fir0_c(float *out, const float *in, const float *coefs)
  97. {
  98.     dca_lfe_fir(out, in, coefs, 32);
  99. }
  100.  
  101. static void dca_lfe_fir1_c(float *out, const float *in, const float *coefs)
  102. {
  103.     dca_lfe_fir(out, in, coefs, 64);
  104. }
  105.  
  106. av_cold void ff_dcadsp_init(DCADSPContext *s)
  107. {
  108.     s->lfe_fir[0]      = dca_lfe_fir0_c;
  109.     s->lfe_fir[1]      = dca_lfe_fir1_c;
  110.     s->qmf_32_subbands = dca_qmf_32_subbands;
  111.     s->decode_hf       = decode_hf_c;
  112.  
  113.     if (ARCH_ARM)
  114.         ff_dcadsp_init_arm(s);
  115.     if (ARCH_X86)
  116.         ff_dcadsp_init_x86(s);
  117. }
  118.