GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/af_stereowiden.c Lines: 0 53 0.0 %
Date: 2020-09-25 23:16:12 Branches: 0 22 0.0 %

Line Branch Exec Source
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/*
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 * Copyright (C) 2012 VLC authors and VideoLAN
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 * Author : Sukrit Sangwan < sukritsangwan at gmail dot com >
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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/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 StereoWidenContext {
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    const AVClass *class;
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    float delay;
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    float feedback;
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    float crossfeed;
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    float drymix;
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    float *buffer;
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    float *cur;
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    int length;
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} StereoWidenContext;
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#define OFFSET(x) offsetof(StereoWidenContext, x)
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#define A  AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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#define AT AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption stereowiden_options[] = {
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    { "delay",     "set delay time",    OFFSET(delay),     AV_OPT_TYPE_FLOAT, {.dbl=20}, 1, 100, A },
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    { "feedback",  "set feedback gain", OFFSET(feedback),  AV_OPT_TYPE_FLOAT, {.dbl=.3}, 0, 0.9, AT },
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    { "crossfeed", "set cross feed",    OFFSET(crossfeed), AV_OPT_TYPE_FLOAT, {.dbl=.3}, 0, 0.8, AT },
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    { "drymix",    "set dry-mix",       OFFSET(drymix),    AV_OPT_TYPE_FLOAT, {.dbl=.8}, 0, 1.0, AT },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(stereowiden);
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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 *layout = NULL;
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    int ret;
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    if ((ret = ff_add_format                 (&formats, AV_SAMPLE_FMT_FLT  )) < 0 ||
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        (ret = ff_set_common_formats         (ctx     , formats            )) < 0 ||
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        (ret = ff_add_channel_layout         (&layout , AV_CH_LAYOUT_STEREO)) < 0 ||
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        (ret = ff_set_common_channel_layouts (ctx     , layout             )) < 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 config_input(AVFilterLink *inlink)
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{
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    AVFilterContext *ctx = inlink->dst;
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    StereoWidenContext *s = ctx->priv;
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    s->length = s->delay * inlink->sample_rate / 1000;
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    s->length *= 2;
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    s->buffer = av_calloc(s->length, sizeof(*s->buffer));
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    if (!s->buffer)
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        return AVERROR(ENOMEM);
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    s->cur = s->buffer;
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    return 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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    AVFilterLink *outlink = ctx->outputs[0];
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    StereoWidenContext *s = ctx->priv;
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    const float *src = (const float *)in->data[0];
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    const float drymix = s->drymix;
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    const float crossfeed = s->crossfeed;
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    const float feedback = s->feedback;
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    AVFrame *out;
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    float *dst;
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    int n;
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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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    dst = (float *)out->data[0];
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    for (n = 0; n < in->nb_samples; n++, src += 2, dst += 2, s->cur += 2) {
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        const float left = src[0], right = src[1];
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        if (s->cur == s->buffer + s->length)
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            s->cur = s->buffer;
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        if (ctx->is_disabled) {
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            dst[0] = left;
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            dst[1] = right;
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        } else {
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            dst[0] = drymix * left - crossfeed * right - feedback * s->cur[1];
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            dst[1] = drymix * right - crossfeed * left - feedback * s->cur[0];
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        }
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        s->cur[0] = left;
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        s->cur[1] = right;
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    }
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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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    StereoWidenContext *s = ctx->priv;
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    av_freep(&s->buffer);
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}
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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_stereowiden = {
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    .name           = "stereowiden",
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    .description    = NULL_IF_CONFIG_SMALL("Apply stereo widening effect."),
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    .query_formats  = query_formats,
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    .priv_size      = sizeof(StereoWidenContext),
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    .priv_class     = &stereowiden_class,
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    .uninit         = uninit,
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    .inputs         = inputs,
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    .outputs        = outputs,
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    .flags          = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
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    .process_command = ff_filter_process_command,
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};