From dcb95ef48255ac2462dbbb8abb3d054013fc4721 Mon Sep 17 00:00:00 2001 From: Kyle Swanson Date: Sat, 24 Oct 2015 00:08:19 -0500 Subject: avfilter: add vibrato filter Signed-off-by: Kyle Swanson --- libavfilter/af_vibrato.c | 210 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 210 insertions(+) create mode 100644 libavfilter/af_vibrato.c (limited to 'libavfilter/af_vibrato.c') diff --git a/libavfilter/af_vibrato.c b/libavfilter/af_vibrato.c new file mode 100644 index 0000000..c7691f2 --- /dev/null +++ b/libavfilter/af_vibrato.c @@ -0,0 +1,210 @@ +/* + * Copyright (c) 2015 Kyle Swanson . + * + * 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(inlink, 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, +}; -- cgit v1.1