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  1. /*
  2. * Copyright (C) 2011 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. static void RENAME(sum2)(SAMPLE *out, const SAMPLE *in1, const SAMPLE *in2, COEFF *coeffp, int index1, int index2, int len){
  21. int i;
  22. COEFF coeff1 = coeffp[index1];
  23. COEFF coeff2 = coeffp[index2];
  24. for(i=0; i<len; i++)
  25. out[i] = R(coeff1*in1[i] + coeff2*in2[i]);
  26. }
  27. static void RENAME(copy)(SAMPLE *out, const SAMPLE *in, COEFF *coeffp, int index, int len){
  28. int i;
  29. COEFF coeff = coeffp[index];
  30. for(i=0; i<len; i++)
  31. out[i] = R(coeff*in[i]);
  32. }
  33. static void RENAME(mix6to2)(SAMPLE **out, const SAMPLE **in, COEFF *coeffp, int len){
  34. int i;
  35. for(i=0; i<len; i++) {
  36. INTER t = in[2][i]*coeffp[0*6+2] + in[3][i]*coeffp[0*6+3];
  37. out[0][i] = R(t + in[0][i]*coeffp[0*6+0] + in[4][i]*coeffp[0*6+4]);
  38. out[1][i] = R(t + in[1][i]*coeffp[1*6+1] + in[5][i]*coeffp[1*6+5]);
  39. }
  40. }
  41. static void RENAME(mix8to2)(SAMPLE **out, const SAMPLE **in, COEFF *coeffp, int len){
  42. int i;
  43. for(i=0; i<len; i++) {
  44. INTER t = in[2][i]*coeffp[0*8+2] + in[3][i]*coeffp[0*8+3];
  45. out[0][i] = R(t + in[0][i]*coeffp[0*8+0] + in[4][i]*coeffp[0*8+4] + in[6][i]*coeffp[0*8+6]);
  46. out[1][i] = R(t + in[1][i]*coeffp[1*8+1] + in[5][i]*coeffp[1*8+5] + in[7][i]*coeffp[1*8+7]);
  47. }
  48. }
  49. static mix_any_func_type *RENAME(get_mix_any_func)(SwrContext *s){
  50. 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)
  51. && s->matrix[0][2] == s->matrix[1][2] && s->matrix[0][3] == s->matrix[1][3]
  52. && !s->matrix[0][1] && !s->matrix[0][5] && !s->matrix[1][0] && !s->matrix[1][4]
  53. )
  54. return RENAME(mix6to2);
  55. if( s->out_ch_layout == AV_CH_LAYOUT_STEREO && s->in_ch_layout == AV_CH_LAYOUT_7POINT1
  56. && s->matrix[0][2] == s->matrix[1][2] && s->matrix[0][3] == s->matrix[1][3]
  57. && !s->matrix[0][1] && !s->matrix[0][5] && !s->matrix[1][0] && !s->matrix[1][4]
  58. && !s->matrix[0][7] && !s->matrix[1][6]
  59. )
  60. return RENAME(mix8to2);
  61. return NULL;
  62. }