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  1. /*
  2.  * Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
  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 "libavutil/attributes.h"
  22. #include "libavutil/samplefmt.h"
  23. #include "flacdsp.h"
  24. #include "config.h"
  25.  
  26. #define SAMPLE_SIZE 16
  27. #define PLANAR 0
  28. #include "flacdsp_template.c"
  29. #include "flacdsp_lpc_template.c"
  30.  
  31. #undef  PLANAR
  32. #define PLANAR 1
  33. #include "flacdsp_template.c"
  34.  
  35. #undef  SAMPLE_SIZE
  36. #undef  PLANAR
  37. #define SAMPLE_SIZE 32
  38. #define PLANAR 0
  39. #include "flacdsp_template.c"
  40. #include "flacdsp_lpc_template.c"
  41.  
  42. #undef  PLANAR
  43. #define PLANAR 1
  44. #include "flacdsp_template.c"
  45.  
  46. static void flac_lpc_16_c(int32_t *decoded, const int coeffs[32],
  47.                           int pred_order, int qlevel, int len)
  48. {
  49.     int i, j;
  50.  
  51.     for (i = pred_order; i < len - 1; i += 2, decoded += 2) {
  52.         int c = coeffs[0];
  53.         int d = decoded[0];
  54.         int s0 = 0, s1 = 0;
  55.         for (j = 1; j < pred_order; j++) {
  56.             s0 += c*d;
  57.             d = decoded[j];
  58.             s1 += c*d;
  59.             c = coeffs[j];
  60.         }
  61.         s0 += c*d;
  62.         d = decoded[j] += s0 >> qlevel;
  63.         s1 += c*d;
  64.         decoded[j + 1] += s1 >> qlevel;
  65.     }
  66.     if (i < len) {
  67.         int sum = 0;
  68.         for (j = 0; j < pred_order; j++)
  69.             sum += coeffs[j] * decoded[j];
  70.         decoded[j] += sum >> qlevel;
  71.     }
  72. }
  73.  
  74. static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32],
  75.                           int pred_order, int qlevel, int len)
  76. {
  77.     int i, j;
  78.  
  79.     for (i = pred_order; i < len; i++, decoded++) {
  80.         int64_t sum = 0;
  81.         for (j = 0; j < pred_order; j++)
  82.             sum += (int64_t)coeffs[j] * decoded[j];
  83.         decoded[j] += sum >> qlevel;
  84.     }
  85.  
  86. }
  87.  
  88. av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt,
  89.                              int bps)
  90. {
  91.     if (bps > 16) {
  92.         c->lpc            = flac_lpc_32_c;
  93.         c->lpc_encode     = flac_lpc_encode_c_32;
  94.     } else {
  95.         c->lpc            = flac_lpc_16_c;
  96.         c->lpc_encode     = flac_lpc_encode_c_16;
  97.     }
  98.  
  99.     switch (fmt) {
  100.     case AV_SAMPLE_FMT_S32:
  101.         c->decorrelate[0] = flac_decorrelate_indep_c_32;
  102.         c->decorrelate[1] = flac_decorrelate_ls_c_32;
  103.         c->decorrelate[2] = flac_decorrelate_rs_c_32;
  104.         c->decorrelate[3] = flac_decorrelate_ms_c_32;
  105.         break;
  106.  
  107.     case AV_SAMPLE_FMT_S32P:
  108.         c->decorrelate[0] = flac_decorrelate_indep_c_32p;
  109.         c->decorrelate[1] = flac_decorrelate_ls_c_32p;
  110.         c->decorrelate[2] = flac_decorrelate_rs_c_32p;
  111.         c->decorrelate[3] = flac_decorrelate_ms_c_32p;
  112.         break;
  113.  
  114.     case AV_SAMPLE_FMT_S16:
  115.         c->decorrelate[0] = flac_decorrelate_indep_c_16;
  116.         c->decorrelate[1] = flac_decorrelate_ls_c_16;
  117.         c->decorrelate[2] = flac_decorrelate_rs_c_16;
  118.         c->decorrelate[3] = flac_decorrelate_ms_c_16;
  119.         break;
  120.  
  121.     case AV_SAMPLE_FMT_S16P:
  122.         c->decorrelate[0] = flac_decorrelate_indep_c_16p;
  123.         c->decorrelate[1] = flac_decorrelate_ls_c_16p;
  124.         c->decorrelate[2] = flac_decorrelate_rs_c_16p;
  125.         c->decorrelate[3] = flac_decorrelate_ms_c_16p;
  126.         break;
  127.     }
  128.  
  129.     if (ARCH_ARM)
  130.         ff_flacdsp_init_arm(c, fmt, bps);
  131. }
  132.