| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | #include "generate_wave_table.h" | ||
| 27 | |||
| 28 | typedef struct VibratoContext { | ||
| 29 | const AVClass *class; | ||
| 30 | double freq; | ||
| 31 | double depth; | ||
| 32 | int channels; | ||
| 33 | |||
| 34 | double **buf; | ||
| 35 | int buf_index; | ||
| 36 | int buf_size; | ||
| 37 | |||
| 38 | double *wave_table; | ||
| 39 | int wave_table_index; | ||
| 40 | int wave_table_size; | ||
| 41 | } VibratoContext; | ||
| 42 | |||
| 43 | #define OFFSET(x) offsetof(VibratoContext, x) | ||
| 44 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 45 | |||
| 46 | static const AVOption vibrato_options[] = { | ||
| 47 | { "f", "set frequency in hertz", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl = 5.0}, 0.1, 20000.0, FLAGS }, | ||
| 48 | { "d", "set depth as percentage", OFFSET(depth), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.00, 1.0, FLAGS }, | ||
| 49 | { NULL } | ||
| 50 | }; | ||
| 51 | |||
| 52 | AVFILTER_DEFINE_CLASS(vibrato); | ||
| 53 | |||
| 54 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 55 | { | ||
| 56 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 57 | ✗ | VibratoContext *s = ctx->priv; | |
| 58 | ✗ | const int wave_table_size = s->wave_table_size; | |
| 59 | ✗ | const double *wave_table = s->wave_table; | |
| 60 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 61 | ✗ | const int channels = s->channels; | |
| 62 | ✗ | const int buf_size = s->buf_size; | |
| 63 | ✗ | const double depth = s->depth; | |
| 64 | ✗ | int wave_table_index = s->wave_table_index; | |
| 65 | ✗ | int buf_index = s->buf_index; | |
| 66 | AVFrame *out; | ||
| 67 | const double *src; | ||
| 68 | double *dst; | ||
| 69 | |||
| 70 | ✗ | if (av_frame_is_writable(in)) { | |
| 71 | ✗ | out = in; | |
| 72 | } else { | ||
| 73 | ✗ | out = ff_get_audio_buffer(outlink, in->nb_samples); | |
| 74 | ✗ | if (!out) { | |
| 75 | ✗ | av_frame_free(&in); | |
| 76 | ✗ | return AVERROR(ENOMEM); | |
| 77 | } | ||
| 78 | ✗ | av_frame_copy_props(out, in); | |
| 79 | } | ||
| 80 | |||
| 81 | ✗ | for (int n = 0; n < in->nb_samples; n++) { | |
| 82 | int samp1_index, samp2_index; | ||
| 83 | double integer, decimal; | ||
| 84 | ✗ | decimal = modf(depth * wave_table[wave_table_index], &integer); | |
| 85 | |||
| 86 | ✗ | wave_table_index++; | |
| 87 | ✗ | if (wave_table_index >= wave_table_size) | |
| 88 | ✗ | wave_table_index -= wave_table_size; | |
| 89 | |||
| 90 | ✗ | samp1_index = buf_index + integer; | |
| 91 | ✗ | if (samp1_index >= buf_size) | |
| 92 | ✗ | samp1_index -= buf_size; | |
| 93 | ✗ | samp2_index = samp1_index + 1; | |
| 94 | ✗ | if (samp2_index >= buf_size) | |
| 95 | ✗ | samp2_index -= buf_size; | |
| 96 | |||
| 97 | ✗ | for (int c = 0; c < channels; c++) { | |
| 98 | double *buf, this_samp; | ||
| 99 | |||
| 100 | ✗ | src = (const double *)in->extended_data[c]; | |
| 101 | ✗ | dst = (double *)out->extended_data[c]; | |
| 102 | ✗ | buf = s->buf[c]; | |
| 103 | |||
| 104 | ✗ | this_samp = src[n]; | |
| 105 | ✗ | dst[n] = buf[samp1_index] + (decimal * (buf[samp2_index] - buf[samp1_index])); | |
| 106 | ✗ | buf[buf_index] = this_samp; | |
| 107 | } | ||
| 108 | ✗ | buf_index++; | |
| 109 | ✗ | if (buf_index >= buf_size) | |
| 110 | ✗ | buf_index -= buf_size; | |
| 111 | } | ||
| 112 | |||
| 113 | ✗ | s->wave_table_index = wave_table_index; | |
| 114 | ✗ | s->buf_index = buf_index; | |
| 115 | ✗ | if (in != out) | |
| 116 | ✗ | av_frame_free(&in); | |
| 117 | |||
| 118 | ✗ | return ff_filter_frame(outlink, out); | |
| 119 | } | ||
| 120 | |||
| 121 | ✗ | static av_cold void uninit(AVFilterContext *ctx) | |
| 122 | { | ||
| 123 | ✗ | VibratoContext *s = ctx->priv; | |
| 124 | int c; | ||
| 125 | |||
| 126 | ✗ | av_freep(&s->wave_table); | |
| 127 | ✗ | for (c = 0; c < s->channels; c++) | |
| 128 | ✗ | av_freep(&s->buf[c]); | |
| 129 | ✗ | av_freep(&s->buf); | |
| 130 | ✗ | } | |
| 131 | |||
| 132 | ✗ | static int config_input(AVFilterLink *inlink) | |
| 133 | { | ||
| 134 | int c; | ||
| 135 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 136 | ✗ | VibratoContext *s = ctx->priv; | |
| 137 | |||
| 138 | ✗ | s->buf = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->buf)); | |
| 139 | ✗ | if (!s->buf) | |
| 140 | ✗ | return AVERROR(ENOMEM); | |
| 141 | ✗ | s->channels = inlink->ch_layout.nb_channels; | |
| 142 | ✗ | s->buf_size = lrint(inlink->sample_rate * 0.005 + 0.5); | |
| 143 | ✗ | for (c = 0; c < s->channels; c++) { | |
| 144 | ✗ | s->buf[c] = av_malloc_array(s->buf_size, sizeof(*s->buf[c])); | |
| 145 | ✗ | if (!s->buf[c]) | |
| 146 | ✗ | return AVERROR(ENOMEM); | |
| 147 | } | ||
| 148 | ✗ | s->buf_index = 0; | |
| 149 | |||
| 150 | ✗ | s->wave_table_size = lrint(inlink->sample_rate / s->freq + 0.5); | |
| 151 | ✗ | s->wave_table = av_malloc_array(s->wave_table_size, sizeof(*s->wave_table)); | |
| 152 | ✗ | if (!s->wave_table) | |
| 153 | ✗ | return AVERROR(ENOMEM); | |
| 154 | ✗ | ff_generate_wave_table(WAVE_SIN, AV_SAMPLE_FMT_DBL, s->wave_table, s->wave_table_size, 0.0, s->buf_size - 1, 3.0 * M_PI_2); | |
| 155 | ✗ | s->wave_table_index = 0; | |
| 156 | |||
| 157 | ✗ | return 0; | |
| 158 | } | ||
| 159 | |||
| 160 | static const AVFilterPad avfilter_af_vibrato_inputs[] = { | ||
| 161 | { | ||
| 162 | .name = "default", | ||
| 163 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 164 | .config_props = config_input, | ||
| 165 | .filter_frame = filter_frame, | ||
| 166 | }, | ||
| 167 | }; | ||
| 168 | |||
| 169 | const FFFilter ff_af_vibrato = { | ||
| 170 | .p.name = "vibrato", | ||
| 171 | .p.description = NULL_IF_CONFIG_SMALL("Apply vibrato effect."), | ||
| 172 | .p.priv_class = &vibrato_class, | ||
| 173 | .p.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | ||
| 174 | .priv_size = sizeof(VibratoContext), | ||
| 175 | .uninit = uninit, | ||
| 176 | FILTER_INPUTS(avfilter_af_vibrato_inputs), | ||
| 177 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 178 | FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP), | ||
| 179 | }; | ||
| 180 |