/*
  * Copyright (c) 2015 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/imgutils.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/opt.h"
 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"

 #include "maskedmerge.h"

 
 #define OFFSET(x) offsetof(MaskedMergeContext, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 
 static const AVOption maskedmerge_options[] = {
     { "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
     { NULL }
 };
 
 AVFILTER_DEFINE_CLASS(maskedmerge);
 
 static int query_formats(AVFilterContext *ctx)
 {
     static const enum AVPixelFormat pix_fmts[] = {
         AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
         AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
         AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
         AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
         AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
         AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
         AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
         AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
         AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
         AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP16,
         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
         AV_PIX_FMT_NONE
     };
 

     return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

 }
 
 static int process_frame(FFFrameSync *fs)
 {
     AVFilterContext *ctx = fs->parent;
     MaskedMergeContext *s = fs->opaque;
     AVFilterLink *outlink = ctx->outputs[0];
     AVFrame *out, *base, *overlay, *mask;
     int ret;
 
     if ((ret = ff_framesync_get_frame(&s->fs, 0, &base,    0)) < 0 ||
         (ret = ff_framesync_get_frame(&s->fs, 1, &overlay, 0)) < 0 ||
         (ret = ff_framesync_get_frame(&s->fs, 2, &mask,    0)) < 0)
         return ret;
 
     if (ctx->is_disabled) {
         out = av_frame_clone(base);
         if (!out)
             return AVERROR(ENOMEM);
     } else {

         int p;
 

         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
         if (!out)
             return AVERROR(ENOMEM);
         av_frame_copy_props(out, base);
 

         for (p = 0; p < s->nb_planes; p++) {
             if (!((1 << p) & s->planes)) {
                 av_image_copy_plane(out->data[p], out->linesize[p], base->data[p], base->linesize[p],
                                     s->width[p], s->height[p]);
                 continue;
             }
 

             s->maskedmerge(base->data[p], overlay->data[p],
                            mask->data[p], out->data[p],
                            base->linesize[p], overlay->linesize[p],
                            mask->linesize[p], out->linesize[p],

                            s->width[p], s->height[p],

                            s->half, s->depth);

         }

     }
     out->pts = av_rescale_q(base->pts, s->fs.time_base, outlink->time_base);
 
     return ff_filter_frame(outlink, out);
 }
 

 static void maskedmerge8(const uint8_t *bsrc, const uint8_t *osrc,
                          const uint8_t *msrc, uint8_t *dst,
                          ptrdiff_t blinesize, ptrdiff_t olinesize,
                          ptrdiff_t mlinesize, ptrdiff_t dlinesize,
                          int w, int h,
                          int half, int shift)

 {

     int x, y;

     for (y = 0; y < h; y++) {
         for (x = 0; x < w; x++) {

             dst[x] = bsrc[x] + ((msrc[x] * (osrc[x] - bsrc[x]) + 128) >> 8);

         }

 
         dst  += dlinesize;
         bsrc += blinesize;
         osrc += olinesize;
         msrc += mlinesize;

     }
 }
 

 static void maskedmerge16(const uint8_t *bbsrc, const uint8_t *oosrc,
                           const uint8_t *mmsrc, uint8_t *ddst,
                           ptrdiff_t blinesize, ptrdiff_t olinesize,
                           ptrdiff_t mlinesize, ptrdiff_t dlinesize,
                           int w, int h,
                           int half, int shift)

 {

     const uint16_t *bsrc = (const uint16_t *)bbsrc;
     const uint16_t *osrc = (const uint16_t *)oosrc;
     const uint16_t *msrc = (const uint16_t *)mmsrc;
     uint16_t *dst = (uint16_t *)ddst;
     int x, y;
 
     for (y = 0; y < h; y++) {
         for (x = 0; x < w; x++) {

             dst[x] = bsrc[x] + ((msrc[x] * (osrc[x] - bsrc[x]) + half) >> shift);

         }
 

         dst  += dlinesize / 2;
         bsrc += blinesize / 2;
         osrc += olinesize / 2;
         msrc += mlinesize / 2;

     }
 }
 
 static int config_input(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     MaskedMergeContext *s = ctx->priv;
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     int vsub, hsub;
 
     s->nb_planes = av_pix_fmt_count_planes(inlink->format);
 
     hsub = desc->log2_chroma_w;
     vsub = desc->log2_chroma_h;

     s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, vsub);

     s->height[0] = s->height[3] = inlink->h;

     s->width[1]  = s->width[2]  = AV_CEIL_RSHIFT(inlink->w, hsub);

     s->width[0]  = s->width[3]  = inlink->w;
 
     s->depth = desc->comp[0].depth;

     s->half = (1 << s->depth) / 2;

 
     if (desc->comp[0].depth == 8)
         s->maskedmerge = maskedmerge8;
     else
         s->maskedmerge = maskedmerge16;
 

     if (ARCH_X86)
         ff_maskedmerge_init_x86(s);
 

     return 0;
 }
 
 static int config_output(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     MaskedMergeContext *s = ctx->priv;
     AVFilterLink *base = ctx->inputs[0];
     AVFilterLink *overlay = ctx->inputs[1];
     AVFilterLink *mask = ctx->inputs[2];
     FFFrameSyncIn *in;
     int ret;
 
     if (base->format != overlay->format ||
         base->format != mask->format) {
         av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
         return AVERROR(EINVAL);
     }
     if (base->w                       != overlay->w ||
         base->h                       != overlay->h ||
         base->sample_aspect_ratio.num != overlay->sample_aspect_ratio.num ||
         base->sample_aspect_ratio.den != overlay->sample_aspect_ratio.den ||
         base->w                       != mask->w ||
         base->h                       != mask->h ||
         base->sample_aspect_ratio.num != mask->sample_aspect_ratio.num ||
         base->sample_aspect_ratio.den != mask->sample_aspect_ratio.den) {
         av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
                "(size %dx%d, SAR %d:%d) do not match the corresponding "
                "second input link %s parameters (%dx%d, SAR %d:%d) "
                "and/or third input link %s parameters (%dx%d, SAR %d:%d)\n",
                ctx->input_pads[0].name, base->w, base->h,
                base->sample_aspect_ratio.num,
                base->sample_aspect_ratio.den,
                ctx->input_pads[1].name, overlay->w, overlay->h,
                overlay->sample_aspect_ratio.num,
                overlay->sample_aspect_ratio.den,
                ctx->input_pads[2].name, mask->w, mask->h,
                mask->sample_aspect_ratio.num,
                mask->sample_aspect_ratio.den);
         return AVERROR(EINVAL);
     }
 
     outlink->w = base->w;
     outlink->h = base->h;
     outlink->time_base = base->time_base;
     outlink->sample_aspect_ratio = base->sample_aspect_ratio;
     outlink->frame_rate = base->frame_rate;
 
     if ((ret = ff_framesync_init(&s->fs, ctx, 3)) < 0)
         return ret;
 
     in = s->fs.in;
     in[0].time_base = base->time_base;
     in[1].time_base = overlay->time_base;
     in[2].time_base = mask->time_base;
     in[0].sync   = 1;
     in[0].before = EXT_STOP;
     in[0].after  = EXT_INFINITY;
     in[1].sync   = 1;
     in[1].before = EXT_STOP;
     in[1].after  = EXT_INFINITY;
     in[2].sync   = 1;
     in[2].before = EXT_STOP;
     in[2].after  = EXT_INFINITY;
     s->fs.opaque   = s;
     s->fs.on_event = process_frame;
 
     return ff_framesync_configure(&s->fs);
 }
 
 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
 {
     MaskedMergeContext *s = inlink->dst->priv;
     return ff_framesync_filter_frame(&s->fs, inlink, buf);
 }
 
 static int request_frame(AVFilterLink *outlink)
 {
     MaskedMergeContext *s = outlink->src->priv;
     return ff_framesync_request_frame(&s->fs, outlink);
 }
 
 static av_cold void uninit(AVFilterContext *ctx)
 {
     MaskedMergeContext *s = ctx->priv;
 
     ff_framesync_uninit(&s->fs);
 }
 
 static const AVFilterPad maskedmerge_inputs[] = {
     {
         .name         = "base",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,
         .config_props = config_input,
     },
     {
         .name         = "overlay",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,
     },
     {
         .name         = "mask",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,
     },
     { NULL }
 };
 
 static const AVFilterPad maskedmerge_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .config_props  = config_output,
         .request_frame = request_frame,
     },
     { NULL }
 };
 
 AVFilter ff_vf_maskedmerge = {
     .name          = "maskedmerge",
     .description   = NULL_IF_CONFIG_SMALL("Merge first stream with second stream using third stream as mask."),
     .priv_size     = sizeof(MaskedMergeContext),
     .uninit        = uninit,
     .query_formats = query_formats,
     .inputs        = maskedmerge_inputs,
     .outputs       = maskedmerge_outputs,
     .priv_class    = &maskedmerge_class,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
 };