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1 | /* | ||
2 | * Copyright (c) 2015 Kyle Swanson <k@ylo.ph>. | ||
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 "libavutil/opt.h" | ||
22 | #include "avfilter.h" | ||
23 | #include "internal.h" | ||
24 | #include "audio.h" | ||
25 | |||
26 | typedef struct TremoloContext { | ||
27 | const AVClass *class; | ||
28 | double freq; | ||
29 | double depth; | ||
30 | double *table; | ||
31 | int table_size; | ||
32 | int index; | ||
33 | } TremoloContext; | ||
34 | |||
35 | #define OFFSET(x) offsetof(TremoloContext, x) | ||
36 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
37 | |||
38 | static const AVOption tremolo_options[] = { | ||
39 | { "f", "set frequency in hertz", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl = 5.0}, 0.1, 20000.0, FLAGS }, | ||
40 | { "d", "set depth as percentage", OFFSET(depth), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.0, 1.0, FLAGS }, | ||
41 | { NULL } | ||
42 | }; | ||
43 | |||
44 | AVFILTER_DEFINE_CLASS(tremolo); | ||
45 | |||
46 | 20 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
47 | { | ||
48 | 20 | AVFilterContext *ctx = inlink->dst; | |
49 | 20 | AVFilterLink *outlink = ctx->outputs[0]; | |
50 | 20 | TremoloContext *s = ctx->priv; | |
51 | 20 | const double *src = (const double *)in->data[0]; | |
52 | 20 | const int channels = inlink->ch_layout.nb_channels; | |
53 | 20 | const int nb_samples = in->nb_samples; | |
54 | AVFrame *out; | ||
55 | double *dst; | ||
56 | int n, c; | ||
57 | |||
58 |
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20 | if (av_frame_is_writable(in)) { |
59 | 20 | out = in; | |
60 | } else { | ||
61 | ✗ | out = ff_get_audio_buffer(outlink, in->nb_samples); | |
62 | ✗ | if (!out) { | |
63 | ✗ | av_frame_free(&in); | |
64 | ✗ | return AVERROR(ENOMEM); | |
65 | } | ||
66 | ✗ | av_frame_copy_props(out, in); | |
67 | } | ||
68 | 20 | dst = (double *)out->data[0]; | |
69 | |||
70 |
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20500 | for (n = 0; n < nb_samples; n++) { |
71 |
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61440 | for (c = 0; c < channels; c++) |
72 | 40960 | dst[c] = src[c] * s->table[s->index]; | |
73 | 20480 | dst += channels; | |
74 | 20480 | src += channels; | |
75 | 20480 | s->index++; | |
76 |
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20480 | if (s->index >= s->table_size) |
77 | 2 | s->index = 0; | |
78 | } | ||
79 | |||
80 |
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20 | if (in != out) |
81 | ✗ | av_frame_free(&in); | |
82 | |||
83 | 20 | return ff_filter_frame(outlink, out); | |
84 | } | ||
85 | |||
86 | 2 | static av_cold void uninit(AVFilterContext *ctx) | |
87 | { | ||
88 | 2 | TremoloContext *s = ctx->priv; | |
89 | 2 | av_freep(&s->table); | |
90 | 2 | } | |
91 | |||
92 | 1 | static int config_input(AVFilterLink *inlink) | |
93 | { | ||
94 | 1 | AVFilterContext *ctx = inlink->dst; | |
95 | 1 | TremoloContext *s = ctx->priv; | |
96 | 1 | const double offset = 1. - s->depth / 2.; | |
97 | int i; | ||
98 | |||
99 | 1 | s->table_size = lrint(inlink->sample_rate / s->freq + 0.5); | |
100 | 1 | s->table = av_malloc_array(s->table_size, sizeof(*s->table)); | |
101 |
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1 | if (!s->table) |
102 | ✗ | return AVERROR(ENOMEM); | |
103 | |||
104 |
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8821 | for (i = 0; i < s->table_size; i++) { |
105 | 8820 | double env = s->freq * i / inlink->sample_rate; | |
106 | 8820 | env = sin(2 * M_PI * fmod(env + 0.25, 1.0)); | |
107 | 8820 | s->table[i] = env * (1 - fabs(offset)) + offset; | |
108 | } | ||
109 | |||
110 | 1 | s->index = 0; | |
111 | |||
112 | 1 | return 0; | |
113 | } | ||
114 | |||
115 | static const AVFilterPad avfilter_af_tremolo_inputs[] = { | ||
116 | { | ||
117 | .name = "default", | ||
118 | .type = AVMEDIA_TYPE_AUDIO, | ||
119 | .config_props = config_input, | ||
120 | .filter_frame = filter_frame, | ||
121 | }, | ||
122 | }; | ||
123 | |||
124 | const AVFilter ff_af_tremolo = { | ||
125 | .name = "tremolo", | ||
126 | .description = NULL_IF_CONFIG_SMALL("Apply tremolo effect."), | ||
127 | .priv_size = sizeof(TremoloContext), | ||
128 | .priv_class = &tremolo_class, | ||
129 | .uninit = uninit, | ||
130 | FILTER_INPUTS(avfilter_af_tremolo_inputs), | ||
131 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
132 | FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBL), | ||
133 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | ||
134 | }; | ||
135 |