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  1. /*
  2.  * Copyright (C) 2011-2012 Michael Niedermayer (michaelni@gmx.at)
  3.  *
  4.  * This file is part of libswresample
  5.  *
  6.  * libswresample 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.  * libswresample 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 libswresample; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #if defined(TEMPLATE_REMATRIX_FLT)
  22. #    define R(x) x
  23. #    define SAMPLE float
  24. #    define COEFF float
  25. #    define INTER float
  26. #    define RENAME(x) x ## _float
  27. #elif defined(TEMPLATE_REMATRIX_DBL)
  28. #    define R(x) x
  29. #    define SAMPLE double
  30. #    define COEFF double
  31. #    define INTER double
  32. #    define RENAME(x) x ## _double
  33. #elif defined(TEMPLATE_REMATRIX_S16)
  34. #    define R(x) (((x) + 16384)>>15)
  35. #    define SAMPLE int16_t
  36. #    define COEFF int
  37. #    define INTER int
  38. #    define RENAME(x) x ## _s16
  39. #elif defined(TEMPLATE_REMATRIX_S32)
  40. #    define R(x) (((x) + 16384)>>15)
  41. #    define SAMPLE int32_t
  42. #    define COEFF int
  43. #    define INTER int64_t
  44. #    define RENAME(x) x ## _s32
  45. #endif
  46.  
  47. typedef void (RENAME(mix_any_func_type))(SAMPLE **out, const SAMPLE **in1, COEFF *coeffp, integer len);
  48.  
  49. static void RENAME(sum2)(SAMPLE *out, const SAMPLE *in1, const SAMPLE *in2, COEFF *coeffp, integer index1, integer index2, integer len){
  50.     int i;
  51.     INTER coeff1 = coeffp[index1];
  52.     INTER coeff2 = coeffp[index2];
  53.  
  54.     for(i=0; i<len; i++)
  55.         out[i] = R(coeff1*in1[i] + coeff2*in2[i]);
  56. }
  57.  
  58. static void RENAME(copy)(SAMPLE *out, const SAMPLE *in, COEFF *coeffp, integer index, integer len){
  59.     int i;
  60.     INTER coeff = coeffp[index];
  61.     for(i=0; i<len; i++)
  62.         out[i] = R(coeff*in[i]);
  63. }
  64.  
  65. static void RENAME(mix6to2)(SAMPLE **out, const SAMPLE **in, COEFF *coeffp, integer len){
  66.     int i;
  67.  
  68.     for(i=0; i<len; i++) {
  69.         INTER t = in[2][i]*(INTER)coeffp[0*6+2] + in[3][i]*(INTER)coeffp[0*6+3];
  70.         out[0][i] = R(t + in[0][i]*(INTER)coeffp[0*6+0] + in[4][i]*(INTER)coeffp[0*6+4]);
  71.         out[1][i] = R(t + in[1][i]*(INTER)coeffp[1*6+1] + in[5][i]*(INTER)coeffp[1*6+5]);
  72.     }
  73. }
  74.  
  75. static void RENAME(mix8to2)(SAMPLE **out, const SAMPLE **in, COEFF *coeffp, integer len){
  76.     int i;
  77.  
  78.     for(i=0; i<len; i++) {
  79.         INTER t = in[2][i]*(INTER)coeffp[0*8+2] + in[3][i]*(INTER)coeffp[0*8+3];
  80.         out[0][i] = R(t + in[0][i]*(INTER)coeffp[0*8+0] + in[4][i]*(INTER)coeffp[0*8+4] + in[6][i]*(INTER)coeffp[0*8+6]);
  81.         out[1][i] = R(t + in[1][i]*(INTER)coeffp[1*8+1] + in[5][i]*(INTER)coeffp[1*8+5] + in[7][i]*(INTER)coeffp[1*8+7]);
  82.     }
  83. }
  84.  
  85. static RENAME(mix_any_func_type) *RENAME(get_mix_any_func)(SwrContext *s){
  86.     if(   s->out_ch_layout == AV_CH_LAYOUT_STEREO && (s->in_ch_layout == AV_CH_LAYOUT_5POINT1 || s->in_ch_layout == AV_CH_LAYOUT_5POINT1_BACK)
  87.        && s->matrix[0][2] == s->matrix[1][2] && s->matrix[0][3] == s->matrix[1][3]
  88.        && !s->matrix[0][1] && !s->matrix[0][5] && !s->matrix[1][0] && !s->matrix[1][4]
  89.     )
  90.         return RENAME(mix6to2);
  91.  
  92.     if(   s->out_ch_layout == AV_CH_LAYOUT_STEREO && s->in_ch_layout == AV_CH_LAYOUT_7POINT1
  93.        && s->matrix[0][2] == s->matrix[1][2] && s->matrix[0][3] == s->matrix[1][3]
  94.        && !s->matrix[0][1] && !s->matrix[0][5] && !s->matrix[1][0] && !s->matrix[1][4]
  95.        && !s->matrix[0][7] && !s->matrix[1][6]
  96.     )
  97.         return RENAME(mix8to2);
  98.  
  99.     return NULL;
  100. }
  101.  
  102. #undef R
  103. #undef SAMPLE
  104. #undef COEFF
  105. #undef INTER
  106. #undef RENAME
  107.