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/*

 * Copyright (c) 2010 Brandon Mintern

 * Copyright (c) 2007 Bobby Bingham

 *

 * 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

 * video fade filter

 * based heavily on vf_negate.c by Bobby Bingham

 */

#include "libavutil/avstring.h"

#include "libavutil/common.h"

#include "libavutil/eval.h"

#include "libavutil/opt.h"

#include "libavutil/pixdesc.h"

#include "avfilter.h"

#include "drawutils.h"

#include "formats.h"

#include "internal.h"

#include "video.h"

#define R 0

#define G 1

#define B 2

#define A 3

#define Y 0

#define U 1

#define V 2

#define FADE_IN  0

#define FADE_OUT 1

typedef struct {

    const AVClass *class;

    int type;

    int factor, fade_per_frame;

    int start_frame, nb_frames;

    unsigned int frame_index;

    int hsub, vsub, bpp;

    unsigned int black_level, black_level_scaled;

    uint8_t is_packed_rgb;

    uint8_t rgba_map[4];

    int alpha;

    uint64_t start_time, duration;

    enum {VF_FADE_WAITING=0, VF_FADE_FADING, VF_FADE_DONE} fade_state;

} FadeContext;

static av_cold int init(AVFilterContext *ctx)

{

    FadeContext *s = ctx->priv;

    s->fade_per_frame = (1 << 16) / s->nb_frames;

    s->fade_state = VF_FADE_WAITING;

    if (s->duration != 0) {

        // If duration (seconds) is non-zero, assume that we are not fading based on frames

        s->nb_frames = 0; // Mostly to clean up logging

    }

    // Choose what to log. If both time-based and frame-based options, both lines will be in the log

    if (s->start_frame || s->nb_frames) {

        av_log(ctx, AV_LOG_VERBOSE,

               "type:%s start_frame:%d nb_frames:%d alpha:%d\n",

               s->type == FADE_IN ? "in" : "out", s->start_frame,

               s->nb_frames,s->alpha);

    }

    if (s->start_time || s->duration) {

        av_log(ctx, AV_LOG_VERBOSE,

               "type:%s start_time:%f duration:%f alpha:%d\n",

               s->type == FADE_IN ? "in" : "out", (s->start_time / (double)AV_TIME_BASE),

               (s->duration / (double)AV_TIME_BASE),s->alpha);

    }

    return 0;

}

static int query_formats(AVFilterContext *ctx)

{

    static const enum AVPixelFormat pix_fmts[] = {

        AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,

        AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,

        AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,

        AV_PIX_FMT_YUV440P,  AV_PIX_FMT_YUVJ440P,

        AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,

        AV_PIX_FMT_RGB24,    AV_PIX_FMT_BGR24,

        AV_PIX_FMT_ARGB,     AV_PIX_FMT_ABGR,

        AV_PIX_FMT_RGBA,     AV_PIX_FMT_BGRA,

        AV_PIX_FMT_NONE

    };

    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

    return 0;

}

const static enum AVPixelFormat studio_level_pix_fmts[] = {

    AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,

    AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,

    AV_PIX_FMT_YUV440P,

    AV_PIX_FMT_NONE

};

static int config_props(AVFilterLink *inlink)

{

    FadeContext *s = inlink->dst->priv;

    const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);

    s->hsub = pixdesc->log2_chroma_w;

    s->vsub = pixdesc->log2_chroma_h;

    s->bpp = av_get_bits_per_pixel(pixdesc) >> 3;

    s->alpha &= !!(pixdesc->flags & AV_PIX_FMT_FLAG_ALPHA);

    s->is_packed_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;

    /* use CCIR601/709 black level for studio-level pixel non-alpha components */

    s->black_level =

            ff_fmt_is_in(inlink->format, studio_level_pix_fmts) && !s->alpha ? 16 : 0;

    /* 32768 = 1 << 15, it is an integer representation

     * of 0.5 and is for rounding. */

    s->black_level_scaled = (s->black_level << 16) + 32768;

    return 0;

}

static int filter_slice_luma(AVFilterContext *ctx, void *arg, int jobnr,

                             int nb_jobs)

{

    FadeContext *s = ctx->priv;

    AVFrame *frame = arg;

    int slice_start = (frame->height *  jobnr   ) / nb_jobs;

    int slice_end   = (frame->height * (jobnr+1)) / nb_jobs;

    int i, j;

    for (i = slice_start; i < slice_end; i++) {

        uint8_t *p = frame->data[0] + i * frame->linesize[0];

        for (j = 0; j < frame->width * s->bpp; j++) {

            /* s->factor is using 16 lower-order bits for decimal

             * places. 32768 = 1 << 15, it is an integer representation

             * of 0.5 and is for rounding. */

            *p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;

            p++;

        }

    }

    return 0;

}

static int filter_slice_chroma(AVFilterContext *ctx, void *arg, int jobnr,

                               int nb_jobs)

{

    FadeContext *s = ctx->priv;

    AVFrame *frame = arg;

    int i, j, plane;

    const int width = FF_CEIL_RSHIFT(frame->width, s->hsub);

    const int height= FF_CEIL_RSHIFT(frame->height, s->vsub);

    int slice_start = (height *  jobnr   ) / nb_jobs;

    int slice_end   = (height * (jobnr+1)) / nb_jobs;

    for (plane = 1; plane < 3; plane++) {

        for (i = slice_start; i < slice_end; i++) {

            uint8_t *p = frame->data[plane] + i * frame->linesize[plane];

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

                /* 8421367 = ((128 << 1) + 1) << 15. It is an integer

                 * representation of 128.5. The .5 is for rounding

                 * purposes. */

                *p = ((*p - 128) * s->factor + 8421367) >> 16;

                p++;

            }

        }

    }

    return 0;

}

static int filter_slice_alpha(AVFilterContext *ctx, void *arg, int jobnr,

                              int nb_jobs)

{

    FadeContext *s = ctx->priv;

    AVFrame *frame = arg;

    int plane = s->is_packed_rgb ? 0 : A;

    int slice_start = (frame->height *  jobnr   ) / nb_jobs;

    int slice_end   = (frame->height * (jobnr+1)) / nb_jobs;

    int i, j;

    for (i = slice_start; i < slice_end; i++) {

        uint8_t *p = frame->data[plane] + i * frame->linesize[plane] + s->is_packed_rgb*s->rgba_map[A];

        int step = s->is_packed_rgb ? 4 : 1;

        for (j = 0; j < frame->width; j++) {

            /* s->factor is using 16 lower-order bits for decimal

             * places. 32768 = 1 << 15, it is an integer representation

             * of 0.5 and is for rounding. */

            *p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;

            p += step;

        }

    }

    return 0;

}

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

{

    AVFilterContext *ctx = inlink->dst;

    FadeContext *s       = ctx->priv;

    double frame_timestamp = frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base);

    // Calculate Fade assuming this is a Fade In

    if (s->fade_state == VF_FADE_WAITING) {

        s->factor=0;

        if ((frame_timestamp >= (s->start_time/(double)AV_TIME_BASE))

            && (s->frame_index >= s->start_frame)) {

            // Time to start fading

            s->fade_state = VF_FADE_FADING;

            // Save start time in case we are starting based on frames and fading based on time

            if ((s->start_time == 0) && (s->start_frame != 0)) {

                s->start_time = frame_timestamp*(double)AV_TIME_BASE;

            }

            // Save start frame in case we are starting based on time and fading based on frames

            if ((s->start_time != 0) && (s->start_frame == 0)) {

                s->start_frame = s->frame_index;

            }

        }

    }

    if (s->fade_state == VF_FADE_FADING) {

        if (s->duration == 0) {

            // Fading based on frame count

            s->factor = (s->frame_index - s->start_frame) * s->fade_per_frame;

            if (s->frame_index > (s->start_frame + s->nb_frames)) {

                s->fade_state = VF_FADE_DONE;

            }

        } else {

            // Fading based on duration

            s->factor = (frame_timestamp - (s->start_time/(double)AV_TIME_BASE))

                            * (float) UINT16_MAX / (s->duration/(double)AV_TIME_BASE);

            if (frame_timestamp > ((s->start_time/(double)AV_TIME_BASE)

                                    + (s->duration/(double)AV_TIME_BASE))) {

                s->fade_state = VF_FADE_DONE;

            }

        }

    }

    if (s->fade_state == VF_FADE_DONE) {

        s->factor=UINT16_MAX;

    }

    s->factor = av_clip_uint16(s->factor);

    // Invert fade_factor if Fading Out

    if (s->type == 1) {

        s->factor=UINT16_MAX-s->factor;

    }

    if (s->factor < UINT16_MAX) {

        if (s->alpha) {

            ctx->internal->execute(ctx, filter_slice_alpha, frame, NULL,

                                FFMIN(frame->height, ctx->graph->nb_threads));

        } else {

            /* luma or rgb plane */

            ctx->internal->execute(ctx, filter_slice_luma, frame, NULL,

                                FFMIN(frame->height, ctx->graph->nb_threads));

            if (frame->data[1] && frame->data[2]) {

                /* chroma planes */

                ctx->internal->execute(ctx, filter_slice_chroma, frame, NULL,

                                    FFMIN(frame->height, ctx->graph->nb_threads));

            }

        }

    }

    s->frame_index++;

    return ff_filter_frame(inlink->dst->outputs[0], frame);

}

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

#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

static const AVOption fade_options[] = {

    { "type", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },

    { "t",    "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },

        { "in",  "fade-in",  0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN },  .unit = "type" },

        { "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .unit = "type" },

    { "start_frame", "Number of the first frame to which to apply the effect.",

                                                    OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },

    { "s",           "Number of the first frame to which to apply the effect.",

                                                    OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },

    { "nb_frames",   "Number of frames to which the effect should be applied.",

                                                    OFFSET(nb_frames),   AV_OPT_TYPE_INT, { .i64 = 25 }, 0, INT_MAX, FLAGS },

    { "n",           "Number of frames to which the effect should be applied.",

                                                    OFFSET(nb_frames),   AV_OPT_TYPE_INT, { .i64 = 25 }, 0, INT_MAX, FLAGS },

    { "alpha",       "fade alpha if it is available on the input", OFFSET(alpha),       AV_OPT_TYPE_INT, {.i64 = 0    }, 0,       1, FLAGS },

    { "start_time",  "Number of seconds of the beginning of the effect.",

                                                    OFFSET(start_time),  AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },

    { "st",          "Number of seconds of the beginning of the effect.",

                                                    OFFSET(start_time),  AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },

    { "duration",    "Duration of the effect in seconds.",

                                                    OFFSET(duration),    AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },

    { "d",           "Duration of the effect in seconds.",

                                                    OFFSET(duration),    AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },

    { NULL }

};

AVFILTER_DEFINE_CLASS(fade);

static const AVFilterPad avfilter_vf_fade_inputs[] = {

    {

        .name           = "default",

        .type           = AVMEDIA_TYPE_VIDEO,

        .config_props   = config_props,

        .filter_frame   = filter_frame,

        .needs_writable = 1,

    },

    { NULL }

};

static const AVFilterPad avfilter_vf_fade_outputs[] = {

    {

        .name = "default",

        .type = AVMEDIA_TYPE_VIDEO,

    },

    { NULL }

};

AVFilter avfilter_vf_fade = {

    .name          = "fade",

    .description   = NULL_IF_CONFIG_SMALL("Fade in/out input video."),

    .init          = init,

    .priv_size     = sizeof(FadeContext),

    .priv_class    = &fade_class,

    .query_formats = query_formats,

    .inputs        = avfilter_vf_fade_inputs,

    .outputs       = avfilter_vf_fade_outputs,

    .flags         = AVFILTER_FLAG_SLICE_THREADS,

};