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