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/*

 * Copyright (c) 2012 Stefano Sabatini

 *

 * 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 filter

 */

#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 ShowWavesMode {

    MODE_POINT,

    MODE_LINE,

    MODE_NB,

};

typedef struct {

    const AVClass *class;

    int w, h;

    AVRational rate;

    int buf_idx;

    AVFrame *outpicref;

    int req_fullfilled;

    int n;

    int sample_count_mod;

    enum ShowWavesMode mode;

} ShowWavesContext;

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

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption showwaves_options[] = {

    { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },

    { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },

    { "mode", "select display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_POINT}, 0, MODE_NB-1, FLAGS, "mode"},

        { "point", "draw a point for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_POINT}, .flags=FLAGS, .unit="mode"},

        { "line",  "draw a line for each sample",  0, AV_OPT_TYPE_CONST, {.i64=MODE_LINE},  .flags=FLAGS, .unit="mode"},

    { "n",    "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },

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

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

    { NULL }

};

AVFILTER_DEFINE_CLASS(showwaves);

static av_cold void uninit(AVFilterContext *ctx)

{

    ShowWavesContext *showwaves = ctx->priv;

    av_frame_free(&showwaves->outpicref);

}

static int query_formats(AVFilterContext *ctx)

{

    AVFilterFormats *formats = NULL;

    AVFilterChannelLayouts *layouts = NULL;

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

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

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

    static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };

    /* set input audio formats */

    formats = ff_make_format_list(sample_fmts);

    if (!formats)

        return AVERROR(ENOMEM);

    ff_formats_ref(formats, &inlink->out_formats);

    layouts = ff_all_channel_layouts();

    if (!layouts)

        return AVERROR(ENOMEM);

    ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);

    formats = ff_all_samplerates();

    if (!formats)

        return AVERROR(ENOMEM);

    ff_formats_ref(formats, &inlink->out_samplerates);

    /* set output video format */

    formats = ff_make_format_list(pix_fmts);

    if (!formats)

        return AVERROR(ENOMEM);

    ff_formats_ref(formats, &outlink->in_formats);

    return 0;

}

static int config_output(AVFilterLink *outlink)

{

    AVFilterContext *ctx = outlink->src;

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

    ShowWavesContext *showwaves = ctx->priv;

    if (!showwaves->n)

        showwaves->n = FFMAX(1, ((double)inlink->sample_rate / (showwaves->w * av_q2d(showwaves->rate))) + 0.5);

    showwaves->buf_idx = 0;

    outlink->w = showwaves->w;

    outlink->h = showwaves->h;

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

    outlink->frame_rate = av_div_q((AVRational){inlink->sample_rate,showwaves->n},

                                   (AVRational){showwaves->w,1});

    av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d r:%f n:%d\n",

           showwaves->w, showwaves->h, av_q2d(outlink->frame_rate), showwaves->n);

    return 0;

}

inline static int push_frame(AVFilterLink *outlink)

{

    ShowWavesContext *showwaves = outlink->src->priv;

    int ret;

    if ((ret = ff_filter_frame(outlink, showwaves->outpicref)) >= 0)

        showwaves->req_fullfilled = 1;

    showwaves->outpicref = NULL;

    showwaves->buf_idx = 0;

    return ret;

}

static int request_frame(AVFilterLink *outlink)

{

    ShowWavesContext *showwaves = outlink->src->priv;

    AVFilterLink *inlink = outlink->src->inputs[0];

    int ret;

    showwaves->req_fullfilled = 0;

    do {

        ret = ff_request_frame(inlink);

    } while (!showwaves->req_fullfilled && ret >= 0);

    if (ret == AVERROR_EOF && showwaves->outpicref)

        push_frame(outlink);

    return ret;

}

#define MAX_INT16 ((1<<15) -1)

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

{

    AVFilterContext *ctx = inlink->dst;

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

    ShowWavesContext *showwaves = ctx->priv;

    const int nb_samples = insamples->nb_samples;

    AVFrame *outpicref = showwaves->outpicref;

    int linesize = outpicref ? outpicref->linesize[0] : 0;

    int16_t *p = (int16_t *)insamples->data[0];

    int nb_channels = inlink->channels;

    int i, j, k, h, ret = 0;

    const int n = showwaves->n;

    const int x = 255 / (nb_channels * n); /* multiplication factor, pre-computed to avoid in-loop divisions */

    /* draw data in the buffer */

    for (i = 0; i < nb_samples; i++) {

        if (!showwaves->outpicref) {

            showwaves->outpicref = outpicref =

                ff_get_video_buffer(outlink, outlink->w, outlink->h);

            if (!outpicref)

                return AVERROR(ENOMEM);

            outpicref->width  = outlink->w;

            outpicref->height = outlink->h;

            outpicref->pts = insamples->pts +

                             av_rescale_q((p - (int16_t *)insamples->data[0]) / nb_channels,

                                          (AVRational){ 1, inlink->sample_rate },

                                          outlink->time_base);

            linesize = outpicref->linesize[0];

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

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

        }

        for (j = 0; j < nb_channels; j++) {

            h = showwaves->h/2 - av_rescale(*p++, showwaves->h/2, MAX_INT16);

            switch (showwaves->mode) {

            case MODE_POINT:

                if (h >= 0 && h < outlink->h)

                    *(outpicref->data[0] + showwaves->buf_idx + h * linesize) += x;

                break;

            case MODE_LINE:

            {

                int start = showwaves->h/2, end = av_clip(h, 0, outlink->h-1);

                if (start > end) FFSWAP(int16_t, start, end);

                for (k = start; k < end; k++)

                    *(outpicref->data[0] + showwaves->buf_idx + k * linesize) += x;

                break;

            }

            }

        }

        showwaves->sample_count_mod++;

        if (showwaves->sample_count_mod == n) {

            showwaves->sample_count_mod = 0;

            showwaves->buf_idx++;

        }

        if (showwaves->buf_idx == showwaves->w)

            if ((ret = push_frame(outlink)) < 0)

                break;

        outpicref = showwaves->outpicref;

    }

    av_frame_free(&insamples);

    return ret;

}

static const AVFilterPad showwaves_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_AUDIO,

        .filter_frame = filter_frame,

    },

    { NULL }

};

static const AVFilterPad showwaves_outputs[] = {

    {

        .name          = "default",

        .type          = AVMEDIA_TYPE_VIDEO,

        .config_props  = config_output,

        .request_frame = request_frame,

    },

    { NULL }

};

AVFilter avfilter_avf_showwaves = {

    .name          = "showwaves",

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

    .uninit        = uninit,

    .query_formats = query_formats,

    .priv_size     = sizeof(ShowWavesContext),

    .inputs        = showwaves_inputs,

    .outputs       = showwaves_outputs,

    .priv_class    = &showwaves_class,

};