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 Libav.
7  *
8  * Libav 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  * Libav 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 Libav; 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 
34  const int32_t *src, const float *mul,
35  int len)
36 {
37  int i;
38  for (i = 0; i < len; i += 8)
39  c->int32_to_float_fmul_scalar(&dst[i], &src[i], *mul++, 8);
40 }
41 
42 static av_always_inline int float_to_int16_one(const float *src){
43  return av_clip_int16(lrintf(*src));
44 }
45 
46 static void float_to_int16_c(int16_t *dst, const float *src, long len)
47 {
48  int i;
49  for(i=0; i<len; i++)
50  dst[i] = float_to_int16_one(src+i);
51 }
52 
53 static void float_to_int16_interleave_c(int16_t *dst, const float **src,
54  long len, int channels)
55 {
56  int i,j,c;
57  if(channels==2){
58  for(i=0; i<len; i++){
59  dst[2*i] = float_to_int16_one(src[0]+i);
60  dst[2*i+1] = float_to_int16_one(src[1]+i);
61  }
62  }else{
63  for(c=0; c<channels; c++)
64  for(i=0, j=c; i<len; i++, j+=channels)
65  dst[j] = float_to_int16_one(src[c]+i);
66  }
67 }
68 
69 void ff_float_interleave_c(float *dst, const float **src, unsigned int len,
70  int channels)
71 {
72  int j, c;
73  unsigned int i;
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 if (channels == 1 && len < INT_MAX / sizeof(float)) {
80  memcpy(dst, src[0], len * sizeof(float));
81  } else {
82  for (c = 0; c < channels; c++)
83  for (i = 0, j = c; i < len; i++, j += channels)
84  dst[j] = src[c][i];
85  }
86 }
87 
89 {
95 
96  if (ARCH_ARM) ff_fmt_convert_init_arm(c, avctx);
98  if (ARCH_X86) ff_fmt_convert_init_x86(c, avctx);
99 }