FFmpeg: libswresample/rematrix_template.c Source File

rematrix_template.c

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