1 /*
2 * Audio resampling
3 *
4 * Copyright (c) 2004-2012 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 "config.h"
24
25 #include "libavutil/attributes.h"
26 #include "libavutil/cpu.h"
27 #include "libavutil/avassert.h"
28
29 #include "libavutil/aarch64/cpu.h"
30 #include "libswresample/resample.h"
31
32 #define DECLARE_RESAMPLE_COMMON_TEMPLATE(TYPE, DELEM, FELEM, FELEM2, OUT) \
33 \
34 void ff_resample_common_apply_filter_x4_##TYPE##_neon(FELEM2 *acc, const DELEM *src, \
35 const FELEM *filter, int length); \
36 \
37 void ff_resample_common_apply_filter_x8_##TYPE##_neon(FELEM2 *acc, const DELEM *src, \
38 const FELEM *filter, int length); \
39 \
40 static int ff_resample_common_##TYPE##_neon(ResampleContext *c, void *dest, const void *source, \
41 int n, int update_ctx) \
42 { \
43 DELEM *dst = dest; \
44 const DELEM *src = source; \
45 int dst_index; \
46 int index = c->index; \
47 int frac = c->frac; \
48 int sample_index = 0; \
49 int x4_aligned_filter_length = c->filter_length & ~3; \
50 int x8_aligned_filter_length = c->filter_length & ~7; \
51 \
52 while (index >= c->phase_count) { \
53 sample_index++; \
54 index -= c->phase_count; \
55 } \
56 \
57 for (dst_index = 0; dst_index < n; dst_index++) { \
58 FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index; \
59 \
60 FELEM2 val = 0; \
61 int i = 0; \
62 if (x8_aligned_filter_length >= 8) { \
63 ff_resample_common_apply_filter_x8_##TYPE##_neon(&val, &src[sample_index], \
64 filter, x8_aligned_filter_length); \
65 i += x8_aligned_filter_length; \
66 \
67 } else if (x4_aligned_filter_length >= 4) { \
68 ff_resample_common_apply_filter_x4_##TYPE##_neon(&val, &src[sample_index], \
69 filter, x4_aligned_filter_length); \
70 i += x4_aligned_filter_length; \
71 } \
72 for (; i < c->filter_length; i++) { \
73 val += src[sample_index + i] * (FELEM2)filter[i]; \
74 } \
75 OUT(dst[dst_index], val); \
76 \
77 frac += c->dst_incr_mod; \
78 index += c->dst_incr_div; \
79 if (frac >= c->src_incr) { \
80 frac -= c->src_incr; \
81 index++; \
82 } \
83 \
84 while (index >= c->phase_count) { \
85 sample_index++; \
86 index -= c->phase_count; \
87 } \
88 } \
89 \
90 if (update_ctx) { \
91 c->frac = frac; \
92 c->index = index; \
93 } \
94 \
95 return sample_index; \
96 } \
97
98 #define OUT(d, v) d = v
DECLARE_RESAMPLE_COMMON_TEMPLATE(float,float,float,float,OUT)99 DECLARE_RESAMPLE_COMMON_TEMPLATE(float, float, float, float, OUT)
100 #undef OUT
101
102 #define OUT(d, v) (v) = ((v) + (1<<(14)))>>15; (d) = av_clip_int16(v)
103 DECLARE_RESAMPLE_COMMON_TEMPLATE(s16, int16_t, int16_t, int32_t, OUT)
104 #undef OUT
105
106 av_cold void swri_resample_dsp_aarch64_init(ResampleContext *c)
107 {
108 int cpu_flags = av_get_cpu_flags();
109
110 if (!have_neon(cpu_flags))
111 return;
112
113 switch(c->format) {
114 case AV_SAMPLE_FMT_FLTP:
115 c->dsp.resample_common = ff_resample_common_float_neon;
116 break;
117 case AV_SAMPLE_FMT_S16P:
118 c->dsp.resample_common = ff_resample_common_s16_neon;
119 break;
120 }
121 }
122