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