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/*

 * Copyright (c) 2013 Paul B Mahol

 *

 * 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

 */

/**

 * @file

 * audio to video multimedia vectorscope filter

 */

#include "libavutil/avassert.h"

#include "libavutil/channel_layout.h"

#include "libavutil/opt.h"

#include "libavutil/parseutils.h"

#include "avfilter.h"

#include "formats.h"

#include "audio.h"

#include "video.h"

#include "internal.h"

enum VectorScopeMode {

    LISSAJOUS,

    LISSAJOUS_XY,

    MODE_NB,

};

typedef struct AudioVectorScopeContext {

    const AVClass *class;

    AVFrame *outpicref;

    int w, h;

    int hw, hh;

    enum VectorScopeMode mode;

    int contrast[3];

    int fade[3];

    double zoom;

    AVRational frame_rate;

} AudioVectorScopeContext;

#define OFFSET(x) offsetof(AudioVectorScopeContext, x)

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption avectorscope_options[] = {

    { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, FLAGS, "mode" },

    { "m",    "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, FLAGS, "mode" },

    { "lissajous",    "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS},    0, 0, FLAGS, "mode" },

    { "lissajous_xy", "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS_XY}, 0, 0, FLAGS, "mode" },

    { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },

    { "r",    "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },

    { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },

    { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },

    { "rc", "set red contrast",   OFFSET(contrast[0]), AV_OPT_TYPE_INT, {.i64=40}, 0, 255, FLAGS },

    { "gc", "set green contrast", OFFSET(contrast[1]), AV_OPT_TYPE_INT, {.i64=160}, 0, 255, FLAGS },

    { "bc", "set blue contrast",  OFFSET(contrast[2]), AV_OPT_TYPE_INT, {.i64=80}, 0, 255, FLAGS },

    { "rf", "set red fade",       OFFSET(fade[0]), AV_OPT_TYPE_INT, {.i64=15}, 0, 255, FLAGS },

    { "gf", "set green fade",     OFFSET(fade[1]), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },

    { "bf", "set blue fade",      OFFSET(fade[2]), AV_OPT_TYPE_INT, {.i64=5}, 0, 255, FLAGS },

    { "zoom", "set zoom factor",  OFFSET(zoom), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 10, FLAGS },

    { NULL }

};

AVFILTER_DEFINE_CLASS(avectorscope);

static void draw_dot(AudioVectorScopeContext *p, unsigned x, unsigned y)

{

    const int linesize = p->outpicref->linesize[0];

    uint8_t *dst;

    if (p->zoom > 1) {

        if (y >= p->h || x >= p->w)

            return;

    } else {

        y = FFMIN(y, p->h - 1);

        x = FFMIN(x, p->w - 1);

    }

    dst = &p->outpicref->data[0][y * linesize + x * 4];

    dst[0] = FFMIN(dst[0] + p->contrast[0], 255);

    dst[1] = FFMIN(dst[1] + p->contrast[1], 255);

    dst[2] = FFMIN(dst[2] + p->contrast[2], 255);

}

static void fade(AudioVectorScopeContext *p)

{

    const int linesize = p->outpicref->linesize[0];

    int i, j;

    if (p->fade[0] || p->fade[1] || p->fade[2]) {

        uint8_t *d = p->outpicref->data[0];

        for (i = 0; i < p->h; i++) {

            for (j = 0; j < p->w*4; j+=4) {

                d[j+0] = FFMAX(d[j+0] - p->fade[0], 0);

                d[j+1] = FFMAX(d[j+1] - p->fade[1], 0);

                d[j+2] = FFMAX(d[j+2] - p->fade[2], 0);

            }

            d += linesize;

        }

    }

}

static int query_formats(AVFilterContext *ctx)

{

    AVFilterFormats *formats = NULL;

    AVFilterChannelLayouts *layout = NULL;

    AVFilterLink *inlink = ctx->inputs[0];

    AVFilterLink *outlink = ctx->outputs[0];

    static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };

    static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };

    formats = ff_make_format_list(sample_fmts);

    if (!formats)

        return AVERROR(ENOMEM);

    ff_formats_ref(formats, &inlink->out_formats);

    ff_add_channel_layout(&layout, AV_CH_LAYOUT_STEREO);

    ff_channel_layouts_ref(layout, &inlink->out_channel_layouts);

    formats = ff_all_samplerates();

    if (!formats)

        return AVERROR(ENOMEM);

    ff_formats_ref(formats, &inlink->out_samplerates);

    formats = ff_make_format_list(pix_fmts);

    if (!formats)

        return AVERROR(ENOMEM);

    ff_formats_ref(formats, &outlink->in_formats);

    return 0;

}

static int config_input(AVFilterLink *inlink)

{

    AVFilterContext *ctx = inlink->dst;

    AudioVectorScopeContext *p = ctx->priv;

    int nb_samples;

    nb_samples = FFMAX(1024, ((double)inlink->sample_rate / av_q2d(p->frame_rate)) + 0.5);

    inlink->partial_buf_size =

    inlink->min_samples =

    inlink->max_samples = nb_samples;

    return 0;

}

static int config_output(AVFilterLink *outlink)

{

    AudioVectorScopeContext *p = outlink->src->priv;

    outlink->w = p->w;

    outlink->h = p->h;

    outlink->sample_aspect_ratio = (AVRational){1,1};

    outlink->frame_rate = p->frame_rate;

    p->hw = p->w / 2;

    p->hh = p->h / 2;

    return 0;

}

static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)

{

    AVFilterContext *ctx = inlink->dst;

    AVFilterLink *outlink = ctx->outputs[0];

    AudioVectorScopeContext *p = ctx->priv;

    const int hw = p->hw;

    const int hh = p->hh;

    unsigned x, y;

    const double zoom = p->zoom;

    int i;

    if (!p->outpicref || p->outpicref->width  != outlink->w ||

                         p->outpicref->height != outlink->h) {

        av_frame_free(&p->outpicref);

        p->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);

        if (!p->outpicref)

            av_frame_free(&insamples);

            return AVERROR(ENOMEM);

        for (i = 0; i < outlink->h; i++)

            memset(p->outpicref->data[0] + i * p->outpicref->linesize[0], 0, outlink->w * 4);

    }

    p->outpicref->pts = insamples->pts;

    fade(p);

    switch (insamples->format) {

    case AV_SAMPLE_FMT_S16:

        for (i = 0; i < insamples->nb_samples; i++) {

            int16_t *src = (int16_t *)insamples->data[0] + i * 2;

            if (p->mode == LISSAJOUS) {

                x = ((src[1] - src[0]) * zoom / (float)(UINT16_MAX) + 1) * hw;

                y = (1.0 - (src[0] + src[1]) * zoom / (float)UINT16_MAX) * hh;

            } else {

                x = (src[1] * zoom / (float)INT16_MAX + 1) * hw;

                y = (src[0] * zoom / (float)INT16_MAX + 1) * hh;

            }

            draw_dot(p, x, y);

        }

        break;

    case AV_SAMPLE_FMT_FLT:

        for (i = 0; i < insamples->nb_samples; i++) {

            float *src = (float *)insamples->data[0] + i * 2;

            if (p->mode == LISSAJOUS) {

                x = ((src[1] - src[0]) * zoom / 2 + 1) * hw;

                y = (1.0 - (src[0] + src[1]) * zoom / 2) * hh;

            } else {

                x = (src[1] * zoom + 1) * hw;

                y = (src[0] * zoom + 1) * hh;

            }

            draw_dot(p, x, y);

        }

        break;

    }

    av_frame_free(&insamples);

    return ff_filter_frame(outlink, av_frame_clone(p->outpicref));

}

static av_cold void uninit(AVFilterContext *ctx)

{

    AudioVectorScopeContext *p = ctx->priv;

    av_frame_free(&p->outpicref);

}

static const AVFilterPad audiovectorscope_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_AUDIO,

        .config_props = config_input,

        .filter_frame = filter_frame,

    },

    { NULL }

};

static const AVFilterPad audiovectorscope_outputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .config_props = config_output,

    },

    { NULL }

};

AVFilter avfilter_avf_avectorscope = {

    .name          = "avectorscope",

    .description   = NULL_IF_CONFIG_SMALL("Convert input audio to vectorscope video output."),

    .uninit        = uninit,

    .query_formats = query_formats,

    .priv_size     = sizeof(AudioVectorScopeContext),

    .inputs        = audiovectorscope_inputs,

    .outputs       = audiovectorscope_outputs,

    .priv_class    = &avectorscope_class,

};