text: /*
   * 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,
  };
  