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fmtconvert.c
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1 /*
2  * Format Conversion Utils
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "avcodec.h"
24 #include "fmtconvert.h"
25 #include "libavutil/common.h"
26 
27 static void int32_to_float_fmul_scalar_c(float *dst, const int *src, float mul, int len){
28  int i;
29  for(i=0; i<len; i++)
30  dst[i] = src[i] * mul;
31 }
32 
33 static av_always_inline int float_to_int16_one(const float *src){
34  return av_clip_int16(lrintf(*src));
35 }
36 
37 static void float_to_int16_c(int16_t *dst, const float *src, long len)
38 {
39  int i;
40  for(i=0; i<len; i++)
41  dst[i] = float_to_int16_one(src+i);
42 }
43 
44 static void float_to_int16_interleave_c(int16_t *dst, const float **src,
45  long len, int channels)
46 {
47  int i,j,c;
48  if(channels==2){
49  for(i=0; i<len; i++){
50  dst[2*i] = float_to_int16_one(src[0]+i);
51  dst[2*i+1] = float_to_int16_one(src[1]+i);
52  }
53  }else{
54  for(c=0; c<channels; c++)
55  for(i=0, j=c; i<len; i++, j+=channels)
56  dst[j] = float_to_int16_one(src[c]+i);
57  }
58 }
59 
60 void ff_float_interleave_c(float *dst, const float **src, unsigned int len,
61  int channels)
62 {
63  int j, c;
64  unsigned int i;
65  if (channels == 2) {
66  for (i = 0; i < len; i++) {
67  dst[2*i] = src[0][i];
68  dst[2*i+1] = src[1][i];
69  }
70  } else if (channels == 1 && len < INT_MAX / sizeof(float)) {
71  memcpy(dst, src[0], len * sizeof(float));
72  } else {
73  for (c = 0; c < channels; c++)
74  for (i = 0, j = c; i < len; i++, j += channels)
75  dst[j] = src[c][i];
76  }
77 }
78 
80 {
85 
86  if (ARCH_ARM) ff_fmt_convert_init_arm(c, avctx);
87  if (HAVE_ALTIVEC) ff_fmt_convert_init_altivec(c, avctx);
88  if (ARCH_X86) ff_fmt_convert_init_x86(c, avctx);
89  if (HAVE_MIPSFPU) ff_fmt_convert_init_mips(c);
90 }
91 
92 /* ffdshow custom code */
93 void float_interleave(float *dst, const float **src, long len, int channels)
94 {
95  int i,j,c;
96  if(channels==2){
97  for(i=0; i<len; i++){
98  dst[2*i] = src[0][i] / 32768.0f;
99  dst[2*i+1] = src[1][i] / 32768.0f;
100  }
101  }else{
102  for(c=0; c<channels; c++)
103  for(i=0, j=c; i<len; i++, j+=channels)
104  dst[j] = src[c][i] / 32768.0f;
105  }
106 }
107 
108 void float_interleave_noscale(float *dst, const float **src, long len, int channels)
109 {
110  int i,j,c;
111  if(channels==2){
112  for(i=0; i<len; i++){
113  dst[2*i] = src[0][i];
114  dst[2*i+1] = src[1][i];
115  }
116  }else{
117  for(c=0; c<channels; c++)
118  for(i=0, j=c; i<len; i++, j+=channels)
119  dst[j] = src[c][i];
120  }
121 }