mirror of https://github.com/FFmpeg/FFmpeg.git
Kyle Swanson
9 years ago
committed by
Paul B Mahol
parent
51ee62d50b
commit
dcb95ef482
6 changed files with 230 additions and 1 deletions
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/*
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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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