/* * Copyright (c) 2015 Kyle Swanson <k@ylo.ph>. * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/opt.h" #include "avfilter.h" #include "internal.h" #include "audio.h" #include "generate_wave_table.h" typedef struct VibratoContext { const AVClass *class; double freq; double depth; int channels; double **buf; int buf_index; int buf_size; double *wave_table; int wave_table_index; int wave_table_size; } VibratoContext; #define OFFSET(x) offsetof(VibratoContext, x) #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM static const AVOption vibrato_options[] = { { "f", "set frequency in hertz", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl = 5.0}, 0.1, 20000.0, FLAGS }, { "d", "set depth as percentage", OFFSET(depth), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.00, 1.0, FLAGS }, { NULL } }; AVFILTER_DEFINE_CLASS(vibrato); static int filter_frame(AVFilterLink *inlink, AVFrame *in) { AVFilterContext *ctx = inlink->dst; VibratoContext *s = ctx->priv; AVFilterLink *outlink = ctx->outputs[0]; AVFrame *out; int n, c; const double *src; double *dst; if (av_frame_is_writable(in)) { out = in; } else { out = ff_get_audio_buffer(outlink, in->nb_samples); if (!out) { av_frame_free(&in); return AVERROR(ENOMEM); } av_frame_copy_props(out, in); } for (n = 0; n < in->nb_samples; n++) { double integer, decimal; decimal = modf(s->depth * s->wave_table[s->wave_table_index], &integer); s->wave_table_index++; if (s->wave_table_index >= s->wave_table_size) s->wave_table_index -= s->wave_table_size; for (c = 0; c < inlink->channels; c++) { int samp1_index, samp2_index; double *buf; double this_samp; src = (const double *)in->extended_data[c]; dst = (double *)out->extended_data[c]; buf = s->buf[c]; samp1_index = s->buf_index + integer; if (samp1_index >= s->buf_size) samp1_index -= s->buf_size; samp2_index = samp1_index + 1; if (samp2_index >= s->buf_size) samp2_index -= s->buf_size; this_samp = src[n]; dst[n] = buf[samp1_index] + (decimal * (buf[samp2_index] - buf[samp1_index])); buf[s->buf_index] = this_samp; } s->buf_index++; if (s->buf_index >= s->buf_size) s->buf_index -= s->buf_size; } if (in != out) av_frame_free(&in); return ff_filter_frame(outlink, out); } static int query_formats(AVFilterContext *ctx) { AVFilterFormats *formats; AVFilterChannelLayouts *layouts; static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_DBLP, AV_SAMPLE_FMT_NONE }; int ret; layouts = ff_all_channel_counts(); if (!layouts) return AVERROR(ENOMEM); ret = ff_set_common_channel_layouts(ctx, layouts); if (ret < 0) return ret; formats = ff_make_format_list(sample_fmts); if (!formats) return AVERROR(ENOMEM); ret = ff_set_common_formats(ctx, formats); if (ret < 0) return ret; formats = ff_all_samplerates(); if (!formats) return AVERROR(ENOMEM); return ff_set_common_samplerates(ctx, formats); } static av_cold void uninit(AVFilterContext *ctx) { VibratoContext *s = ctx->priv; int c; av_freep(&s->wave_table); for (c = 0; c < s->channels; c++) av_freep(&s->buf[c]); av_freep(&s->buf); } static int config_input(AVFilterLink *inlink) { int c; AVFilterContext *ctx = inlink->dst; VibratoContext *s = ctx->priv; s->channels = inlink->channels; s->buf = av_calloc(inlink->channels, sizeof(*s->buf)); if (!s->buf) return AVERROR(ENOMEM); s->buf_size = inlink->sample_rate * 0.005; for (c = 0; c < s->channels; c++) { s->buf[c] = av_malloc_array(s->buf_size, sizeof(*s->buf[c])); if (!s->buf[c]) return AVERROR(ENOMEM); } s->buf_index = 0; s->wave_table_size = inlink->sample_rate / s->freq; s->wave_table = av_malloc_array(s->wave_table_size, sizeof(*s->wave_table)); if (!s->wave_table) return AVERROR(ENOMEM); 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); s->wave_table_index = 0; return 0; } static const AVFilterPad avfilter_af_vibrato_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_AUDIO, .config_props = config_input, .filter_frame = filter_frame, }, { NULL } }; static const AVFilterPad avfilter_af_vibrato_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_AUDIO, }, { NULL } }; AVFilter ff_af_vibrato = { .name = "vibrato", .description = NULL_IF_CONFIG_SMALL("Apply vibrato effect."), .priv_size = sizeof(VibratoContext), .priv_class = &vibrato_class, .uninit = uninit, .query_formats = query_formats, .inputs = avfilter_af_vibrato_inputs, .outputs = avfilter_af_vibrato_outputs, };