FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
rematrix_template.c
Go to the documentation of this file.
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 #endif
40 
41 typedef void (RENAME(mix_any_func_type))(SAMPLE **out, const SAMPLE **in1, COEFF *coeffp, integer len);
42 
43 static void RENAME(sum2)(SAMPLE *out, const SAMPLE *in1, const SAMPLE *in2, COEFF *coeffp, integer index1, integer index2, integer len){
44  int i;
45  COEFF coeff1 = coeffp[index1];
46  COEFF coeff2 = coeffp[index2];
47 
48  for(i=0; i<len; i++)
49  out[i] = R(coeff1*in1[i] + coeff2*in2[i]);
50 }
51 
52 static void RENAME(copy)(SAMPLE *out, const SAMPLE *in, COEFF *coeffp, integer index, integer len){
53  int i;
54  COEFF coeff = coeffp[index];
55  for(i=0; i<len; i++)
56  out[i] = R(coeff*in[i]);
57 }
58 
59 static void RENAME(mix6to2)(SAMPLE **out, const SAMPLE **in, COEFF *coeffp, integer len){
60  int i;
61 
62  for(i=0; i<len; i++) {
63  INTER t = in[2][i]*coeffp[0*6+2] + in[3][i]*coeffp[0*6+3];
64  out[0][i] = R(t + in[0][i]*coeffp[0*6+0] + in[4][i]*coeffp[0*6+4]);
65  out[1][i] = R(t + in[1][i]*coeffp[1*6+1] + in[5][i]*coeffp[1*6+5]);
66  }
67 }
68 
69 static void RENAME(mix8to2)(SAMPLE **out, const SAMPLE **in, COEFF *coeffp, integer len){
70  int i;
71 
72  for(i=0; i<len; i++) {
73  INTER t = in[2][i]*coeffp[0*8+2] + in[3][i]*coeffp[0*8+3];
74  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]);
75  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]);
76  }
77 }
78 
79 static RENAME(mix_any_func_type) *RENAME(get_mix_any_func)(SwrContext *s){
80  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)
81  && s->matrix[0][2] == s->matrix[1][2] && s->matrix[0][3] == s->matrix[1][3]
82  && !s->matrix[0][1] && !s->matrix[0][5] && !s->matrix[1][0] && !s->matrix[1][4]
83  )
84  return RENAME(mix6to2);
85 
86  if( s->out_ch_layout == AV_CH_LAYOUT_STEREO && s->in_ch_layout == AV_CH_LAYOUT_7POINT1
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  && !s->matrix[0][7] && !s->matrix[1][6]
90  )
91  return RENAME(mix8to2);
92 
93  return NULL;
94 }
95 
96 #undef R
97 #undef SAMPLE
98 #undef COEFF
99 #undef INTER
100 #undef RENAME