mirror of
https://github.com/FFmpeg/FFmpeg.git
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e08dc59200
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
167 lines
5.7 KiB
C
167 lines
5.7 KiB
C
/*
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* Copyright (c) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen, Vladimir Sadovnikov and others
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* Copyright (c) 2015 Paul B Mahol
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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 "libavutil/samplefmt.h"
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#include "avfilter.h"
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#include "audio.h"
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#include "internal.h"
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typedef struct CompensationDelayContext {
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const AVClass *class;
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int distance_mm;
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int distance_cm;
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int distance_m;
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double dry, wet;
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int temp;
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unsigned delay;
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unsigned w_ptr;
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unsigned buf_size;
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AVFrame *delay_frame;
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} CompensationDelayContext;
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#define OFFSET(x) offsetof(CompensationDelayContext, x)
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#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption compensationdelay_options[] = {
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{ "mm", "set mm distance", OFFSET(distance_mm), AV_OPT_TYPE_INT, {.i64=0}, 0, 10, A },
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{ "cm", "set cm distance", OFFSET(distance_cm), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, A },
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{ "m", "set meter distance", OFFSET(distance_m), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, A },
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{ "dry", "set dry amount", OFFSET(dry), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, A },
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{ "wet", "set wet amount", OFFSET(wet), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, A },
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{ "temp", "set temperature °C", OFFSET(temp), AV_OPT_TYPE_INT, {.i64=20}, -50, 50, A },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(compensationdelay);
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// The maximum distance for options
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#define COMP_DELAY_MAX_DISTANCE (100.0 * 100.0 + 100.0 * 1.0 + 1.0)
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// The actual speed of sound in normal conditions
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#define COMP_DELAY_SOUND_SPEED_KM_H(temp) 1.85325 * (643.95 * sqrt(((temp + 273.15) / 273.15)))
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#define COMP_DELAY_SOUND_SPEED_CM_S(temp) (COMP_DELAY_SOUND_SPEED_KM_H(temp) * (1000.0 * 100.0) /* cm/km */ / (60.0 * 60.0) /* s/h */)
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#define COMP_DELAY_SOUND_FRONT_DELAY(temp) (1.0 / COMP_DELAY_SOUND_SPEED_CM_S(temp))
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// The maximum delay may be reached by this filter
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#define COMP_DELAY_MAX_DELAY (COMP_DELAY_MAX_DISTANCE * COMP_DELAY_SOUND_FRONT_DELAY(50))
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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CompensationDelayContext *s = ctx->priv;
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unsigned min_size, new_size = 1;
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s->delay = (s->distance_m * 100. + s->distance_cm * 1. + s->distance_mm * .1) *
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COMP_DELAY_SOUND_FRONT_DELAY(s->temp) * inlink->sample_rate;
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min_size = inlink->sample_rate * COMP_DELAY_MAX_DELAY;
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while (new_size < min_size)
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new_size <<= 1;
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s->delay_frame = av_frame_alloc();
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if (!s->delay_frame)
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return AVERROR(ENOMEM);
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s->buf_size = new_size;
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s->delay_frame->format = inlink->format;
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s->delay_frame->nb_samples = new_size;
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s->delay_frame->channel_layout = inlink->channel_layout;
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return av_frame_get_buffer(s->delay_frame, 0);
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}
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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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CompensationDelayContext *s = ctx->priv;
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const unsigned b_mask = s->buf_size - 1;
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const unsigned buf_size = s->buf_size;
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const unsigned delay = s->delay;
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const double dry = s->dry;
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const double wet = s->wet;
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unsigned r_ptr, w_ptr = 0;
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AVFrame *out;
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int n, ch;
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out = ff_get_audio_buffer(ctx->outputs[0], 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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for (ch = 0; ch < inlink->channels; ch++) {
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const double *src = (const double *)in->extended_data[ch];
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double *dst = (double *)out->extended_data[ch];
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double *buffer = (double *)s->delay_frame->extended_data[ch];
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w_ptr = s->w_ptr;
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r_ptr = (w_ptr + buf_size - delay) & b_mask;
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for (n = 0; n < in->nb_samples; n++) {
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const double sample = src[n];
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buffer[w_ptr] = sample;
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dst[n] = dry * sample + wet * buffer[r_ptr];
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w_ptr = (w_ptr + 1) & b_mask;
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r_ptr = (r_ptr + 1) & b_mask;
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}
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}
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s->w_ptr = w_ptr;
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av_frame_free(&in);
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return ff_filter_frame(ctx->outputs[0], out);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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CompensationDelayContext *s = ctx->priv;
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av_frame_free(&s->delay_frame);
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}
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static const AVFilterPad compensationdelay_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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};
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static const AVFilterPad compensationdelay_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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};
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const AVFilter ff_af_compensationdelay = {
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.name = "compensationdelay",
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.description = NULL_IF_CONFIG_SMALL("Audio Compensation Delay Line."),
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.priv_size = sizeof(CompensationDelayContext),
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.priv_class = &compensationdelay_class,
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.uninit = uninit,
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FILTER_INPUTS(compensationdelay_inputs),
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FILTER_OUTPUTS(compensationdelay_outputs),
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FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
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};
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