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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 int32_t *src,
28  float mul, int len)
29 {
30  int i;
31  for(i=0; i<len; i++)
32  dst[i] = src[i] * mul;
33 }
34 
36  const int32_t *src, const float *mul,
37  int len)
38 {
39  int i;
40  for (i = 0; i < len; i += 8)
41  c->int32_to_float_fmul_scalar(&dst[i], &src[i], *mul++, 8);
42 }
43 
45 {
48 
49  if (ARCH_ARM) ff_fmt_convert_init_arm(c, avctx);
50  if (ARCH_PPC) ff_fmt_convert_init_ppc(c, avctx);
51  if (ARCH_X86) ff_fmt_convert_init_x86(c, avctx);
52  if (HAVE_MIPSFPU) ff_fmt_convert_init_mips(c);
53 }
54 
55 /* ffdshow custom code */
56 void float_interleave(float *dst, const float **src, long len, int channels)
57 {
58  int i,j,c;
59  if(channels==2){
60  for(i=0; i<len; i++){
61  dst[2*i] = src[0][i] / 32768.0f;
62  dst[2*i+1] = src[1][i] / 32768.0f;
63  }
64  }else{
65  for(c=0; c<channels; c++)
66  for(i=0, j=c; i<len; i++, j+=channels)
67  dst[j] = src[c][i] / 32768.0f;
68  }
69 }
70 
71 void float_interleave_noscale(float *dst, const float **src, long len, int channels)
72 {
73  int i,j,c;
74  if(channels==2){
75  for(i=0; i<len; i++){
76  dst[2*i] = src[0][i];
77  dst[2*i+1] = src[1][i];
78  }
79  }else{
80  for(c=0; c<channels; c++)
81  for(i=0, j=c; i<len; i++, j+=channels)
82  dst[j] = src[c][i];
83  }
84 }