GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/af_asubboost.c Lines: 0 87 0.0 %
Date: 2020-09-25 23:16:12 Branches: 0 28 0.0 %

Line Branch Exec Source
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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/channel_layout.h"
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#include "libavutil/ffmath.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "audio.h"
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#include "formats.h"
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typedef struct ASubBoostContext {
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    const AVClass *class;
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    double dry_gain;
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    double wet_gain;
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    double feedback;
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    double decay;
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    double delay;
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    double cutoff;
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    double slope;
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    double a0, a1, a2;
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    double b0, b1, b2;
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    int write_pos;
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    int buffer_samples;
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    AVFrame *i, *o;
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    AVFrame *buffer;
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} ASubBoostContext;
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static int query_formats(AVFilterContext *ctx)
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{
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    AVFilterFormats *formats = NULL;
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    AVFilterChannelLayouts *layouts = NULL;
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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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    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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    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_all_samplerates();
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    return ff_set_common_samplerates(ctx, formats);
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}
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static int get_coeffs(AVFilterContext *ctx)
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{
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    ASubBoostContext *s = ctx->priv;
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    AVFilterLink *inlink = ctx->inputs[0];
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    double w0 = 2 * M_PI * s->cutoff / inlink->sample_rate;
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    double alpha = sin(w0) / 2 * sqrt(2. * (1. / s->slope - 1.) + 2.);
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    s->a0 =  1 + alpha;
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    s->a1 = -2 * cos(w0);
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    s->a2 =  1 - alpha;
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    s->b0 = (1 - cos(w0)) / 2;
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    s->b1 =  1 - cos(w0);
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    s->b2 = (1 - cos(w0)) / 2;
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    s->a1 /= s->a0;
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    s->a2 /= s->a0;
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    s->b0 /= s->a0;
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    s->b1 /= s->a0;
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    s->b2 /= s->a0;
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    s->buffer_samples = inlink->sample_rate * s->delay / 1000;
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    return 0;
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}
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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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    ASubBoostContext *s = ctx->priv;
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    s->buffer = ff_get_audio_buffer(inlink, inlink->sample_rate / 10);
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    s->i = ff_get_audio_buffer(inlink, 2);
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    s->o = ff_get_audio_buffer(inlink, 2);
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    if (!s->buffer || !s->i || !s->o)
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        return AVERROR(ENOMEM);
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    return get_coeffs(ctx);
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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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    AVFilterLink *outlink = ctx->outputs[0];
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    ASubBoostContext *s = ctx->priv;
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    const float wet = s->wet_gain, dry = s->dry_gain, feedback = s->feedback, decay = s->decay;
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    int write_pos;
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    AVFrame *out;
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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(outlink, 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 (int ch = 0; ch < in->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->buffer->extended_data[ch];
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        double *ix = (double *)s->i->extended_data[ch];
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        double *ox = (double *)s->o->extended_data[ch];
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        write_pos = s->write_pos;
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        for (int n = 0; n < in->nb_samples; n++) {
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            double out_sample;
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            out_sample = src[n] * s->b0 + ix[0] * s->b1 + ix[1] * s->b2 - ox[0] * s->a1 - ox[1] * s->a2;
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            ix[1] = ix[0];
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            ix[0] = src[n];
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            ox[1] = ox[0];
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            ox[0] = out_sample;
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            buffer[write_pos] = buffer[write_pos] * decay + out_sample * feedback;
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            dst[n] = src[n] * dry + buffer[write_pos] * wet;
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            if (++write_pos >= s->buffer_samples)
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                write_pos = 0;
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        }
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    }
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    s->write_pos = write_pos;
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    if (out != in)
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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 av_cold void uninit(AVFilterContext *ctx)
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{
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    ASubBoostContext *s = ctx->priv;
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    av_frame_free(&s->buffer);
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    av_frame_free(&s->i);
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    av_frame_free(&s->o);
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}
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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                           char *res, int res_len, int flags)
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{
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    int ret;
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    ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
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    if (ret < 0)
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        return ret;
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    return get_coeffs(ctx);
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}
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#define OFFSET(x) offsetof(ASubBoostContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption asubboost_options[] = {
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    { "dry",      "set dry gain", OFFSET(dry_gain), AV_OPT_TYPE_DOUBLE, {.dbl=0.5},      0,   1, FLAGS },
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    { "wet",      "set wet gain", OFFSET(wet_gain), AV_OPT_TYPE_DOUBLE, {.dbl=0.8},      0,   1, FLAGS },
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    { "decay",    "set decay",    OFFSET(decay),    AV_OPT_TYPE_DOUBLE, {.dbl=0.7},      0,   1, FLAGS },
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    { "feedback", "set feedback", OFFSET(feedback), AV_OPT_TYPE_DOUBLE, {.dbl=0.5},      0,   1, FLAGS },
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    { "cutoff",   "set cutoff",   OFFSET(cutoff),   AV_OPT_TYPE_DOUBLE, {.dbl=100},     50, 900, FLAGS },
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    { "slope",    "set slope",    OFFSET(slope),    AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0.0001,   1, FLAGS },
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    { "delay",    "set delay",    OFFSET(delay),    AV_OPT_TYPE_DOUBLE, {.dbl=20},       1, 100, FLAGS },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(asubboost);
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static const AVFilterPad inputs[] = {
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    {
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        .name         = "default",
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        .type         = AVMEDIA_TYPE_AUDIO,
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        .filter_frame = filter_frame,
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        .config_props = config_input,
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    },
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    { NULL }
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};
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static const AVFilterPad 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_asubboost = {
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    .name           = "asubboost",
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    .description    = NULL_IF_CONFIG_SMALL("Boost subwoofer frequencies."),
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    .query_formats  = query_formats,
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    .priv_size      = sizeof(ASubBoostContext),
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    .priv_class     = &asubboost_class,
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    .uninit         = uninit,
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    .inputs         = inputs,
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    .outputs        = outputs,
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    .process_command = process_command,
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};