| /* |
| * 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 = lrint(inlink->sample_rate * 0.005 + 0.5); |
| 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 = lrint(inlink->sample_rate / s->freq + 0.5); |
| 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, |
| }; |