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 = (uint64_t)(v + 0x80000000) > 0xFFFFFFFF ? (v>>63) ^ 0x7FFFFFFF : 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 = (unsigned)(v + 32768) > 65535 ? (v>>31) ^ 32767 : v
73 static void RENAME(resample_one)(DELEM *dst, const DELEM *src,
74 int dst_size, int64_t index2, int64_t incr)
78 for (dst_index = 0; dst_index < dst_size; dst_index++) {
79 dst[dst_index] = src[index2 >> 32];
84 static int RENAME(resample_common)(ResampleContext *c,
85 DELEM *dst, const DELEM *src,
86 int n, int update_ctx)
91 int sample_index = index >> c->phase_shift;
93 index &= c->phase_mask;
94 for (dst_index = 0; dst_index < n; dst_index++) {
95 FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index;
99 for (i = 0; i < c->filter_length; i++) {
100 val += src[sample_index + i] * (FELEM2)filter[i];
102 OUT(dst[dst_index], val);
104 frac += c->dst_incr_mod;
105 index += c->dst_incr_div;
106 if (frac >= c->src_incr) {
110 sample_index += index >> c->phase_shift;
111 index &= c->phase_mask;
122 static int RENAME(resample_linear)(ResampleContext *c,
123 DELEM *dst, const DELEM *src,
124 int n, int update_ctx)
129 int sample_index = index >> c->phase_shift;
130 #if FILTER_SHIFT == 0
131 double inv_src_incr = 1.0 / c->src_incr;
134 index &= c->phase_mask;
135 for (dst_index = 0; dst_index < n; dst_index++) {
136 FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index;
137 FELEM2 val=0, v2 = 0;
140 for (i = 0; i < c->filter_length; i++) {
141 val += src[sample_index + i] * (FELEM2)filter[i];
142 v2 += src[sample_index + i] * (FELEM2)filter[i + c->filter_alloc];
145 val += (v2 - val) * (FELEML) frac / c->src_incr;
147 # if FILTER_SHIFT == 0
148 val += (v2 - val) * inv_src_incr * frac;
150 val += (v2 - val) / c->src_incr * frac;
153 OUT(dst[dst_index], val);
155 frac += c->dst_incr_mod;
156 index += c->dst_incr_div;
157 if (frac >= c->src_incr) {
161 sample_index += index >> c->phase_shift;
162 index &= c->phase_mask;