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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/mem.h" | ||
| 22 | #include "libavutil/opt.h" | ||
| 23 | #include "avfilter.h" | ||
| 24 | #include "filters.h" | ||
| 25 | #include "audio.h" | ||
| 26 | |||
| 27 | typedef struct TremoloContext { | ||
| 28 | const AVClass *class; | ||
| 29 | double freq; | ||
| 30 | double depth; | ||
| 31 | double *table; | ||
| 32 | int table_size; | ||
| 33 | int index; | ||
| 34 | } TremoloContext; | ||
| 35 | |||
| 36 | #define OFFSET(x) offsetof(TremoloContext, x) | ||
| 37 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 38 | |||
| 39 | static const AVOption tremolo_options[] = { | ||
| 40 | { "f", "set frequency in hertz", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl = 5.0}, 0.1, 20000.0, FLAGS }, | ||
| 41 | { "d", "set depth as percentage", OFFSET(depth), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.0, 1.0, FLAGS }, | ||
| 42 | { NULL } | ||
| 43 | }; | ||
| 44 | |||
| 45 | AVFILTER_DEFINE_CLASS(tremolo); | ||
| 46 | |||
| 47 | 6 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 48 | { | ||
| 49 | 6 | AVFilterContext *ctx = inlink->dst; | |
| 50 | 6 | AVFilterLink *outlink = ctx->outputs[0]; | |
| 51 | 6 | TremoloContext *s = ctx->priv; | |
| 52 | 6 | const double *src = (const double *)in->data[0]; | |
| 53 | 6 | const int channels = inlink->ch_layout.nb_channels; | |
| 54 | 6 | const int nb_samples = in->nb_samples; | |
| 55 | AVFrame *out; | ||
| 56 | double *dst; | ||
| 57 | int n, c; | ||
| 58 | |||
| 59 |
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6 | if (av_frame_is_writable(in)) { |
| 60 | 6 | out = in; | |
| 61 | } else { | ||
| 62 | ✗ | out = ff_get_audio_buffer(outlink, in->nb_samples); | |
| 63 | ✗ | if (!out) { | |
| 64 | ✗ | av_frame_free(&in); | |
| 65 | ✗ | return AVERROR(ENOMEM); | |
| 66 | } | ||
| 67 | ✗ | av_frame_copy_props(out, in); | |
| 68 | } | ||
| 69 | 6 | dst = (double *)out->data[0]; | |
| 70 | |||
| 71 |
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24582 | for (n = 0; n < nb_samples; n++) { |
| 72 |
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73728 | for (c = 0; c < channels; c++) |
| 73 | 49152 | dst[c] = src[c] * s->table[s->index]; | |
| 74 | 24576 | dst += channels; | |
| 75 | 24576 | src += channels; | |
| 76 | 24576 | s->index++; | |
| 77 |
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24576 | if (s->index >= s->table_size) |
| 78 | 2 | s->index = 0; | |
| 79 | } | ||
| 80 | |||
| 81 |
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6 | if (in != out) |
| 82 | ✗ | av_frame_free(&in); | |
| 83 | |||
| 84 | 6 | return ff_filter_frame(outlink, out); | |
| 85 | } | ||
| 86 | |||
| 87 | 2 | static av_cold void uninit(AVFilterContext *ctx) | |
| 88 | { | ||
| 89 | 2 | TremoloContext *s = ctx->priv; | |
| 90 | 2 | av_freep(&s->table); | |
| 91 | 2 | } | |
| 92 | |||
| 93 | 1 | static int config_input(AVFilterLink *inlink) | |
| 94 | { | ||
| 95 | 1 | AVFilterContext *ctx = inlink->dst; | |
| 96 | 1 | TremoloContext *s = ctx->priv; | |
| 97 | 1 | const double offset = 1. - s->depth / 2.; | |
| 98 | int i; | ||
| 99 | |||
| 100 | 1 | s->table_size = lrint(inlink->sample_rate / s->freq + 0.5); | |
| 101 | 1 | s->table = av_malloc_array(s->table_size, sizeof(*s->table)); | |
| 102 |
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1 | if (!s->table) |
| 103 | ✗ | return AVERROR(ENOMEM); | |
| 104 | |||
| 105 |
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8821 | for (i = 0; i < s->table_size; i++) { |
| 106 | 8820 | double env = s->freq * i / inlink->sample_rate; | |
| 107 | 8820 | env = sin(2 * M_PI * fmod(env + 0.25, 1.0)); | |
| 108 | 8820 | s->table[i] = env * (1 - fabs(offset)) + offset; | |
| 109 | } | ||
| 110 | |||
| 111 | 1 | s->index = 0; | |
| 112 | |||
| 113 | 1 | return 0; | |
| 114 | } | ||
| 115 | |||
| 116 | static const AVFilterPad avfilter_af_tremolo_inputs[] = { | ||
| 117 | { | ||
| 118 | .name = "default", | ||
| 119 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 120 | .config_props = config_input, | ||
| 121 | .filter_frame = filter_frame, | ||
| 122 | }, | ||
| 123 | }; | ||
| 124 | |||
| 125 | const AVFilter ff_af_tremolo = { | ||
| 126 | .name = "tremolo", | ||
| 127 | .description = NULL_IF_CONFIG_SMALL("Apply tremolo effect."), | ||
| 128 | .priv_size = sizeof(TremoloContext), | ||
| 129 | .priv_class = &tremolo_class, | ||
| 130 | .uninit = uninit, | ||
| 131 | FILTER_INPUTS(avfilter_af_tremolo_inputs), | ||
| 132 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 133 | FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBL), | ||
| 134 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | ||
| 135 | }; | ||
| 136 |