3 * Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * @author Michael Niedermayer <michaelni@gmx.at>
28 #if defined(TEMPLATE_RESAMPLE_DBL)
30 # define RENAME(N) N ## _double
31 # define FILTER_SHIFT 0
34 # define FELEM2 double
35 # define OUT(d, v) d = v
37 #elif defined(TEMPLATE_RESAMPLE_FLT)
39 # define RENAME(N) N ## _float
40 # define FILTER_SHIFT 0
44 # define OUT(d, v) d = v
46 #elif defined(TEMPLATE_RESAMPLE_S32)
48 # define RENAME(N) N ## _int32
49 # define FILTER_SHIFT 30
50 # define DELEM int32_t
51 # define FELEM int32_t
52 # define FELEM2 int64_t
53 # define FELEM_MAX INT32_MAX
54 # define FELEM_MIN INT32_MIN
55 # define OUT(d, v) (v) = ((v) + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;\
56 (d) = av_clipl_int32(v)
58 #elif defined(TEMPLATE_RESAMPLE_S16)
60 # define RENAME(N) N ## _int16
61 # define FILTER_SHIFT 15
62 # define DELEM int16_t
63 # define FELEM int16_t
64 # define FELEM2 int32_t
65 # define FELEML int64_t
66 # define FELEM_MAX INT16_MAX
67 # define FELEM_MIN INT16_MIN
68 # define OUT(d, v) (v) = ((v) + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;\
69 (d) = av_clip_int16(v)
73 static void RENAME(resample_one)(void *dest, const void *source,
74 int dst_size, int64_t index2, int64_t incr)
77 const DELEM *src = source;
80 for (dst_index = 0; dst_index < dst_size; dst_index++) {
81 dst[dst_index] = src[index2 >> 32];
86 static int RENAME(resample_common)(ResampleContext *c,
87 void *dest, const void *source,
88 int n, int update_ctx)
91 const DELEM *src = source;
97 while (index >= c->phase_count) {
99 index -= c->phase_count;
102 for (dst_index = 0; dst_index < n; dst_index++) {
103 FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index;
107 for (i = 0; i < c->filter_length; i++) {
108 val += src[sample_index + i] * (FELEM2)filter[i];
110 OUT(dst[dst_index], val);
112 frac += c->dst_incr_mod;
113 index += c->dst_incr_div;
114 if (frac >= c->src_incr) {
119 while (index >= c->phase_count) {
121 index -= c->phase_count;
133 static int RENAME(resample_linear)(ResampleContext *c,
134 void *dest, const void *source,
135 int n, int update_ctx)
138 const DELEM *src = source;
142 int sample_index = 0;
143 #if FILTER_SHIFT == 0
144 double inv_src_incr = 1.0 / c->src_incr;
147 while (index >= c->phase_count) {
149 index -= c->phase_count;
152 for (dst_index = 0; dst_index < n; dst_index++) {
153 FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index;
154 FELEM2 val=0, v2 = 0;
157 for (i = 0; i < c->filter_length; i++) {
158 val += src[sample_index + i] * (FELEM2)filter[i];
159 v2 += src[sample_index + i] * (FELEM2)filter[i + c->filter_alloc];
162 val += (v2 - val) * (FELEML) frac / c->src_incr;
164 # if FILTER_SHIFT == 0
165 val += (v2 - val) * inv_src_incr * frac;
167 val += (v2 - val) / c->src_incr * frac;
170 OUT(dst[dst_index], val);
172 frac += c->dst_incr_mod;
173 index += c->dst_incr_div;
174 if (frac >= c->src_incr) {
179 while (index >= c->phase_count) {
181 index -= c->phase_count;