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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

 */

#include "libavutil/avstring.h"

#include "libavutil/imgutils.h"

#include "libavutil/opt.h"

#include "libavutil/pixdesc.h"

#include "avfilter.h"

#include "drawutils.h"

#include "internal.h"

#define PLANE_R 0x01

#define PLANE_G 0x02

#define PLANE_B 0x04

#define PLANE_A 0x08

#define PLANE_Y 0x10

#define PLANE_U 0x20

#define PLANE_V 0x40

typedef struct {

    const AVClass *class;

    int requested_planes;

    int map[4];

    int linesize[4];

    int is_packed_rgb;

    int depth;

    int step;

} ExtractPlanesContext;

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

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption extractplanes_options[] = {

    { "planes", "set planes",  OFFSET(requested_planes), AV_OPT_TYPE_FLAGS, {.i64=1}, 1, 0xff, FLAGS, "flags"},

    {      "y", "set luma plane",  0, AV_OPT_TYPE_CONST, {.i64=PLANE_Y}, 0, 0, FLAGS, "flags"},

    {      "u", "set u plane",     0, AV_OPT_TYPE_CONST, {.i64=PLANE_U}, 0, 0, FLAGS, "flags"},

    {      "v", "set v plane",     0, AV_OPT_TYPE_CONST, {.i64=PLANE_V}, 0, 0, FLAGS, "flags"},

    {      "r", "set red plane",   0, AV_OPT_TYPE_CONST, {.i64=PLANE_R}, 0, 0, FLAGS, "flags"},

    {      "g", "set green plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_G}, 0, 0, FLAGS, "flags"},

    {      "b", "set blue plane",  0, AV_OPT_TYPE_CONST, {.i64=PLANE_B}, 0, 0, FLAGS, "flags"},

    {      "a", "set alpha plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_A}, 0, 0, FLAGS, "flags"},

    { NULL }

};

AVFILTER_DEFINE_CLASS(extractplanes);

static int query_formats(AVFilterContext *ctx)

{

    static const enum AVPixelFormat in_pixfmts[] = {

        AV_PIX_FMT_YUV410P,

        AV_PIX_FMT_YUV411P,

        AV_PIX_FMT_YUV440P,

        AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,

        AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA422P,

        AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,

        AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,

        AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P,

        AV_PIX_FMT_YUV420P16LE, AV_PIX_FMT_YUVA420P16LE,

        AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_YUVA420P16BE,

        AV_PIX_FMT_YUV422P16LE, AV_PIX_FMT_YUVA422P16LE,

        AV_PIX_FMT_YUV422P16BE, AV_PIX_FMT_YUVA422P16BE,

        AV_PIX_FMT_YUV444P16LE, AV_PIX_FMT_YUVA444P16LE,

        AV_PIX_FMT_YUV444P16BE, AV_PIX_FMT_YUVA444P16BE,

        AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,

        AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_GRAY16BE,

        AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,

        AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,

        AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,

        AV_PIX_FMT_RGB48LE, AV_PIX_FMT_BGR48LE,

        AV_PIX_FMT_RGB48BE, AV_PIX_FMT_BGR48BE,

        AV_PIX_FMT_RGBA64LE, AV_PIX_FMT_BGRA64LE,

        AV_PIX_FMT_RGBA64BE, AV_PIX_FMT_BGRA64BE,

        AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,

        AV_PIX_FMT_GBRP16LE, AV_PIX_FMT_GBRP16BE,

        AV_PIX_FMT_GBRAP16LE, AV_PIX_FMT_GBRAP16BE,

        AV_PIX_FMT_NONE,

    };

    static const enum AVPixelFormat out8_pixfmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };

    static const enum AVPixelFormat out16le_pixfmts[] = { AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_NONE };

    static const enum AVPixelFormat out16be_pixfmts[] = { AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_NONE };

    const enum AVPixelFormat *out_pixfmts;

    const AVPixFmtDescriptor *desc;

    AVFilterFormats *avff;

    int i, depth = 0, be = 0;

    if (!ctx->inputs[0]->in_formats ||

        !ctx->inputs[0]->in_formats->nb_formats) {

        return AVERROR(EAGAIN);

    }

    if (!ctx->inputs[0]->out_formats)

        ff_formats_ref(ff_make_format_list(in_pixfmts), &ctx->inputs[0]->out_formats);

    avff = ctx->inputs[0]->in_formats;

    desc = av_pix_fmt_desc_get(avff->formats[0]);

    depth = desc->comp[0].depth_minus1;

    be = desc->flags & AV_PIX_FMT_FLAG_BE;

    for (i = 1; i < avff->nb_formats; i++) {

        desc = av_pix_fmt_desc_get(avff->formats[i]);

        if (depth != desc->comp[0].depth_minus1 ||

            be    != (desc->flags & AV_PIX_FMT_FLAG_BE)) {

            return AVERROR(EAGAIN);

        }

    }

    if (depth == 7)

        out_pixfmts = out8_pixfmts;

    else if (be)

        out_pixfmts = out16be_pixfmts;

    else

        out_pixfmts = out16le_pixfmts;

    for (i = 0; i < ctx->nb_outputs; i++)

        ff_formats_ref(ff_make_format_list(out_pixfmts), &ctx->outputs[i]->in_formats);

    return 0;

}

static int config_input(AVFilterLink *inlink)

{

    AVFilterContext *ctx = inlink->dst;

    ExtractPlanesContext *e = ctx->priv;

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

    int plane_avail, ret, i;

    uint8_t rgba_map[4];

    plane_avail = ((desc->flags & AV_PIX_FMT_FLAG_RGB) ? PLANE_R|PLANE_G|PLANE_B :

                                                 PLANE_Y |

                                ((desc->nb_components > 2) ? PLANE_U|PLANE_V : 0)) |

                  ((desc->flags & AV_PIX_FMT_FLAG_ALPHA) ? PLANE_A : 0);

    if (e->requested_planes & ~plane_avail) {

        av_log(ctx, AV_LOG_ERROR, "Requested planes not available.\n");

        return AVERROR(EINVAL);

    }

    if ((ret = av_image_fill_linesizes(e->linesize, inlink->format, inlink->w)) < 0)

        return ret;

    e->depth = (desc->comp[0].depth_minus1 + 1) >> 3;

    e->step = av_get_padded_bits_per_pixel(desc) >> 3;

    e->is_packed_rgb = !(desc->flags & AV_PIX_FMT_FLAG_PLANAR);

    if (desc->flags & AV_PIX_FMT_FLAG_RGB) {

        ff_fill_rgba_map(rgba_map, inlink->format);

        for (i = 0; i < 4; i++)

            e->map[i] = rgba_map[e->map[i]];

    }

    return 0;

}

static int config_output(AVFilterLink *outlink)

{

    AVFilterContext *ctx = outlink->src;

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

    ExtractPlanesContext *e = ctx->priv;

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

    const int output = outlink->srcpad - ctx->output_pads;

    if (e->map[output] == 1 || e->map[output] == 2) {

        outlink->h = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);

        outlink->w = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);

    }

    return 0;

}

static void extract_from_packed(uint8_t *dst, int dst_linesize,

                                const uint8_t *src, int src_linesize,

                                int width, int height,

                                int depth, int step, int comp)

{

    int x, y;

    for (y = 0; y < height; y++) {

        switch (depth) {

        case 1:

            for (x = 0; x < width; x++)

                dst[x] = src[x * step + comp];

            break;

        case 2:

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

                dst[x * 2    ] = src[x * step + comp * 2    ];

                dst[x * 2 + 1] = src[x * step + comp * 2 + 1];

            }

            break;

        }

        dst += dst_linesize;

        src += src_linesize;

    }

}

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

{

    AVFilterContext *ctx = inlink->dst;

    ExtractPlanesContext *e = ctx->priv;

    int i, eof = 0, ret = 0;

    for (i = 0; i < ctx->nb_outputs; i++) {

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

        const int idx = e->map[i];

        AVFrame *out;

        if (outlink->closed)

            continue;

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

        if (!out) {

            ret = AVERROR(ENOMEM);

            break;

        }

        av_frame_copy_props(out, frame);

        if (e->is_packed_rgb) {

            extract_from_packed(out->data[0], out->linesize[0],

                                frame->data[0], frame->linesize[0],

                                outlink->w, outlink->h,

                                e->depth,

                                e->step, idx);

        } else {

            av_image_copy_plane(out->data[0], out->linesize[0],

                                frame->data[idx], frame->linesize[idx],

                                e->linesize[idx], outlink->h);

        }

        ret = ff_filter_frame(outlink, out);

        if (ret == AVERROR_EOF)

            eof++;

        else if (ret < 0)

            break;

    }

    av_frame_free(&frame);

    if (eof == ctx->nb_outputs)

        ret = AVERROR_EOF;

    else if (ret == AVERROR_EOF)

        ret = 0;

    return ret;

}

static av_cold int init(AVFilterContext *ctx)

{

    ExtractPlanesContext *e = ctx->priv;

    int planes = (e->requested_planes & 0xf) | (e->requested_planes >> 4);

    int i;

    for (i = 0; i < 4; i++) {

        char *name;

        AVFilterPad pad = { 0 };

        if (!(planes & (1 << i)))

            continue;

        name = av_asprintf("out%d", ctx->nb_outputs);

        if (!name)

            return AVERROR(ENOMEM);

        e->map[ctx->nb_outputs] = i;

        pad.name = name;

        pad.type = AVMEDIA_TYPE_VIDEO;

        pad.config_props = config_output;

        ff_insert_outpad(ctx, ctx->nb_outputs, &pad);

    }

    return 0;

}

static av_cold void uninit(AVFilterContext *ctx)

{

    int i;

    for (i = 0; i < ctx->nb_outputs; i++)

        av_freep(&ctx->output_pads[i].name);

}

static const AVFilterPad extractplanes_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .filter_frame = filter_frame,

        .config_props = config_input,

    },

    { NULL }

};

AVFilter avfilter_vf_extractplanes = {

    .name          = "extractplanes",

    .description   = NULL_IF_CONFIG_SMALL("Extract planes as grayscale frames."),

    .priv_size     = sizeof(ExtractPlanesContext),

    .priv_class    = &extractplanes_class,

    .init          = init,

    .uninit        = uninit,

    .query_formats = query_formats,

    .inputs        = extractplanes_inputs,

    .outputs       = NULL,

    .flags         = AVFILTER_FLAG_DYNAMIC_OUTPUTS,

};

#if CONFIG_ALPHAEXTRACT_FILTER

static av_cold int init_alphaextract(AVFilterContext *ctx)

{

    ExtractPlanesContext *e = ctx->priv;

    e->requested_planes = PLANE_A;

    return init(ctx);

}

AVFilter avfilter_vf_alphaextract = {

    .name           = "alphaextract",

    .description    = NULL_IF_CONFIG_SMALL("Extract an alpha channel as a "

                      "grayscale image component."),

    .priv_size      = sizeof(ExtractPlanesContext),

    .init           = init_alphaextract,

    .uninit         = uninit,

    .query_formats  = query_formats,

    .inputs         = extractplanes_inputs,

    .outputs        = NULL,

    .flags          = AVFILTER_FLAG_DYNAMIC_OUTPUTS,

};

#endif  /* CONFIG_ALPHAEXTRACT_FILTER */