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resample_template.c
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1 /*
2  * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <math.h>
22 #include <stdint.h>
23 
24 #include "libavutil/common.h"
25 #include "internal.h"
26 
27 #if defined(CONFIG_RESAMPLE_DBL)
28 #define SET_TYPE(func) func ## _dbl
29 #define FELEM double
30 #define FELEM2 double
31 #define FELEML double
32 #define OUT(d, v) d = v
33 #define DBL_TO_FELEM(d, v) d = v
34 #elif defined(CONFIG_RESAMPLE_FLT)
35 #define SET_TYPE(func) func ## _flt
36 #define FELEM float
37 #define FELEM2 float
38 #define FELEML float
39 #define OUT(d, v) d = v
40 #define DBL_TO_FELEM(d, v) d = v
41 #elif defined(CONFIG_RESAMPLE_S32)
42 #define SET_TYPE(func) func ## _s32
43 #define FELEM int32_t
44 #define FELEM2 int64_t
45 #define FELEML int64_t
46 #define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30)
47 #define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30)));
48 #else
49 #define SET_TYPE(func) func ## _s16
50 #define FELEM int16_t
51 #define FELEM2 int32_t
52 #define FELEML int64_t
53 #define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15)
54 #define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15)))
55 #endif
56 
57 static void SET_TYPE(resample_nearest)(void *dst0, int dst_index, const void *src0, unsigned int index)
58 {
59  FELEM *dst = dst0;
60  const FELEM *src = src0;
61  dst[dst_index] = src[index];
62 }
63 
64 static void SET_TYPE(resample_linear)(ResampleContext *c, void *dst0, int dst_index,
65  const void *src0, unsigned int index, int frac)
66 {
67  FELEM *dst = dst0;
68  const FELEM *src = src0;
69  int i;
70  unsigned int sample_index = index >> c->phase_shift;
71  FELEM2 val = 0;
72  FELEM *filter = ((FELEM *)c->filter_bank) +
73  c->filter_length * (index & c->phase_mask);
74  FELEM2 v2 = 0;
75 
76  for (i = 0; i < c->filter_length; i++) {
77  val += src[sample_index + i] * (FELEM2)filter[i];
78  v2 += src[sample_index + i] * (FELEM2)filter[i + c->filter_length];
79  }
80  val += (v2 - val) * (FELEML)frac / c->src_incr;
81 
82  OUT(dst[dst_index], val);
83 }
84 
86  void *dst0, int dst_index, const void *src0,
87  unsigned int index, int frac)
88 {
89  FELEM *dst = dst0;
90  const FELEM *src = src0;
91  int i;
92  unsigned int sample_index = index >> c->phase_shift;
93  FELEM2 val = 0;
94  FELEM *filter = ((FELEM *)c->filter_bank) +
95  c->filter_length * (index & c->phase_mask);
96 
97  for (i = 0; i < c->filter_length; i++)
98  val += src[sample_index + i] * (FELEM2)filter[i];
99 
100  OUT(dst[dst_index], val);
101 }
102 
103 static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,
104  int tap_count)
105 {
106  int i;
107  FELEM *filter = ((FELEM *)filter0) + phase * tap_count;
108  for (i = 0; i < tap_count; i++) {
109  DBL_TO_FELEM(filter[i], tab[i]);
110  }
111 }
112 
113 #undef SET_TYPE
114 #undef FELEM
115 #undef FELEM2
116 #undef FELEML
117 #undef OUT
118 #undef DBL_TO_FELEM
const char const char void * val
Definition: avisynth_c.h:771
#define OUT(d, v)
#define DBL_TO_FELEM(d, v)
static void SET_TYPE() set_filter(void *filter0, double *tab, int phase, int tap_count)
#define src
Definition: vp8dsp.c:254
static void filter0(int32_t *dst, const int32_t *src, int32_t coeff, ptrdiff_t len)
Definition: dcadsp.c:350
int16_t FELEM
Definition: resample2.c:37
int64_t FELEML
Definition: resample2.c:39
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, uint8_t clip)
Definition: cfhd.c:80
#define FELEM2
static void SET_TYPE() resample_nearest(void *dst0, int dst_index, const void *src0, unsigned int index)
static void SET_TYPE() resample_linear(ResampleContext *c, void *dst0, int dst_index, const void *src0, unsigned int index, int frac)
static void SET_TYPE() resample_one(ResampleContext *c, void *dst0, int dst_index, const void *src0, unsigned int index, int frac)
#define SET_TYPE(func)
int index
Definition: gxfenc.c:89
#define src0
Definition: h264pred.c:138
common internal and external API header
static AVCodec * c
static const struct twinvq_data tab
int32_t FELEM2
Definition: resample2.c:38