/*

  * Copyright (C) 2006-2011 Michael Niedermayer <michaelni@gmx.at>

  *               2010      James Darnley <james.darnley@gmail.com>

  *
  * FFmpeg is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 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 General Public License for more details.
  *
  * You should have received a copy of the GNU 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/avassert.h"

 #include "libavutil/cpu.h"
 #include "libavutil/common.h"

 #include "libavutil/opt.h"

 #include "libavutil/pixdesc.h"

 #include "avfilter.h"

 #include "formats.h"

 #include "internal.h"

 #include "video.h"

 #include "yadif.h"
 
 #undef NDEBUG
 #include <assert.h>
 

 #define PERM_RWP AV_PERM_WRITE | AV_PERM_PRESERVE | AV_PERM_REUSE
 

 #define CHECK(j)\

     {   int score = FFABS(cur[mrefs + off_left + (j)] - cur[prefs + off_left - (j)])\

                   + FFABS(cur[mrefs  +(j)] - cur[prefs  -(j)])\

                   + FFABS(cur[mrefs + off_right + (j)] - cur[prefs + off_right - (j)]);\

         if (score < spatial_score) {\
             spatial_score= score;\

             spatial_pred= (cur[mrefs  +(j)] + cur[prefs  -(j)])>>1;\

 #define FILTER(start, end) \
     for (x = start;  x < end; x++) { \

         int c = cur[mrefs]; \
         int d = (prev2[0] + next2[0])>>1; \
         int e = cur[prefs]; \
         int temporal_diff0 = FFABS(prev2[0] - next2[0]); \
         int temporal_diff1 =(FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e) )>>1; \
         int temporal_diff2 =(FFABS(next[mrefs] - c) + FFABS(next[prefs] - e) )>>1; \

         int diff = FFMAX3(temporal_diff0 >> 1, temporal_diff1, temporal_diff2); \
         int spatial_pred = (c+e) >> 1; \

         int off_right = (x < w - 1) ? 1 : -1;\
         int off_left  = x ? -1 : 1;\
         int spatial_score = FFABS(cur[mrefs + off_left]  - cur[prefs + off_left]) + FFABS(c-e) \
                           + FFABS(cur[mrefs + off_right] - cur[prefs + off_right]) - 1; \

  \

         if (x > 2 && x < w - 3) {\
             CHECK(-1) CHECK(-2) }} }} \
             CHECK( 1) CHECK( 2) }} }} \
         }\

  \
         if (mode < 2) { \

             int b = (prev2[2 * mrefs] + next2[2 * mrefs])>>1; \
             int f = (prev2[2 * prefs] + next2[2 * prefs])>>1; \
             int max = FFMAX3(d - e, d - c, FFMIN(b - c, f - e)); \
             int min = FFMIN3(d - e, d - c, FFMAX(b - c, f - e)); \

  \
             diff = FFMAX3(diff, min, -max); \
         } \
  \
         if (spatial_pred > d + diff) \
            spatial_pred = d + diff; \
         else if (spatial_pred < d - diff) \
            spatial_pred = d - diff; \
  \
         dst[0] = spatial_pred; \
  \
         dst++; \
         cur++; \
         prev++; \
         next++; \
         prev2++; \
         next2++; \
     }

 static void filter_line_c(void *dst1,
                           void *prev1, void *cur1, void *next1,

                           int w, int prefs, int mrefs, int parity, int mode)
 {

     uint8_t *dst  = dst1;
     uint8_t *prev = prev1;
     uint8_t *cur  = cur1;
     uint8_t *next = next1;

     int x;
     uint8_t *prev2 = parity ? prev : cur ;
     uint8_t *next2 = parity ? cur  : next;

     FILTER(0, w)

 }
 

 static void filter_edges(void *dst1, void *prev1, void *cur1, void *next1,
                          int w, int prefs, int mrefs, int parity, int mode,
                          int l_edge)
 {
     uint8_t *dst  = dst1;
     uint8_t *prev = prev1;
     uint8_t *cur  = cur1;
     uint8_t *next = next1;
     int x;
     uint8_t *prev2 = parity ? prev : cur ;
     uint8_t *next2 = parity ? cur  : next;
 
     FILTER(0, l_edge)
 
     dst  = (uint8_t*)dst1  + w - 3;
     prev = (uint8_t*)prev1 + w - 3;
     cur  = (uint8_t*)cur1  + w - 3;
     next = (uint8_t*)next1 + w - 3;
     prev2 = (uint8_t*)(parity ? prev : cur);
     next2 = (uint8_t*)(parity ? cur  : next);
 
     FILTER(w - 3, w)
 }
 
 

 static void filter_line_c_16bit(void *dst1,
                                 void *prev1, void *cur1, void *next1,

                                 int w, int prefs, int mrefs, int parity,
                                 int mode)

 {

     uint16_t *dst  = dst1;
     uint16_t *prev = prev1;
     uint16_t *cur  = cur1;
     uint16_t *next = next1;

     int x;
     uint16_t *prev2 = parity ? prev : cur ;
     uint16_t *next2 = parity ? cur  : next;

     mrefs /= 2;
     prefs /= 2;

     FILTER(0, w)
 }
 
 static void filter_edges_16bit(void *dst1, void *prev1, void *cur1, void *next1,
                                int w, int prefs, int mrefs, int parity, int mode,
                                int l_edge)
 {
     uint16_t *dst  = dst1;
     uint16_t *prev = prev1;
     uint16_t *cur  = cur1;
     uint16_t *next = next1;
     int x;
     uint16_t *prev2 = parity ? prev : cur ;
     uint16_t *next2 = parity ? cur  : next;
 
     FILTER(0, l_edge)
 
     dst   = (uint16_t*)dst1  + w - 3;
     prev  = (uint16_t*)prev1 + w - 3;
     cur   = (uint16_t*)cur1  + w - 3;
     next  = (uint16_t*)next1 + w - 3;
     prev2 = (uint16_t*)(parity ? prev : cur);
     next2 = (uint16_t*)(parity ? cur  : next);
 
     FILTER(w - 3, w)

 }
 

 static void filter(AVFilterContext *ctx, AVFilterBufferRef *dstpic,
                    int parity, int tff)
 {
     YADIFContext *yadif = ctx->priv;
     int y, i;
 

     for (i = 0; i < yadif->csp->nb_components; i++) {
         int w = dstpic->video->w;
         int h = dstpic->video->h;

         int refs = yadif->cur->linesize[i];

         int df = (yadif->csp->comp[i].depth_minus1 + 8) / 8;

         int l_edge, l_edge_pix;

         if (i == 1 || i == 2) {

         /* Why is this not part of the per-plane description thing? */
             w >>= yadif->csp->log2_chroma_w;
             h >>= yadif->csp->log2_chroma_h;
         }
 

         /* filtering reads 3 pixels to the left/right; to avoid invalid reads,
          * we need to call the c variant which avoids this for border pixels
          */
         l_edge     = yadif->req_align;
         l_edge_pix = l_edge / df;

         for (y = 0; y < h; y++) {
             if ((y ^ parity) & 1) {

                 uint8_t *prev = &yadif->prev->data[i][y * refs];
                 uint8_t *cur  = &yadif->cur ->data[i][y * refs];
                 uint8_t *next = &yadif->next->data[i][y * refs];
                 uint8_t *dst  = &dstpic->data[i][y * dstpic->linesize[i]];
                 int     mode  = y == 1 || y + 2 == h ? 2 : yadif->mode;

                 if (yadif->req_align) {
                     yadif->filter_line(dst + l_edge, prev + l_edge, cur + l_edge,
                                        next + l_edge, w - l_edge_pix - 3,
                                        y + 1 < h ? refs : -refs,
                                        y ? -refs : refs,
                                        parity ^ tff, mode);
                     yadif->filter_edges(dst, prev, cur, next, w,
                                          y + 1 < h ? refs : -refs,
                                          y ? -refs : refs,
                                          parity ^ tff, mode, l_edge_pix);
                 } else {
                     yadif->filter_line(dst, prev, cur, next + l_edge, w,
                                        y + 1 < h ? refs : -refs,
                                        y ? -refs : refs,
                                        parity ^ tff, mode);

                 }

             } else {

                 memcpy(&dstpic->data[i][y * dstpic->linesize[i]],
                        &yadif->cur->data[i][y * refs], w * df);

             }
         }
     }

 
     emms_c();

 }
 

 static int return_frame(AVFilterContext *ctx, int is_second)

 {

     YADIFContext *yadif = ctx->priv;

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

     int tff, ret;

 
     if (yadif->parity == -1) {
         tff = yadif->cur->video->interlaced ?

               yadif->cur->video->top_field_first : 1;

     } else {

         tff = yadif->parity ^ 1;

     }

     if (is_second) {

         yadif->out = ff_get_video_buffer(link, PERM_RWP, link->w, link->h);

         if (!yadif->out)
             return AVERROR(ENOMEM);
 

         avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
         yadif->out->video->interlaced = 0;
     }

 
     filter(ctx, yadif->out, tff ^ !is_second, tff);
 

     if (is_second) {

         int64_t cur_pts  = yadif->cur->pts;
         int64_t next_pts = yadif->next->pts;
 
         if (next_pts != AV_NOPTS_VALUE && cur_pts != AV_NOPTS_VALUE) {
             yadif->out->pts = cur_pts + next_pts;

         } else {
             yadif->out->pts = AV_NOPTS_VALUE;
         }
     }

     ret = ff_filter_frame(ctx->outputs[0], yadif->out);

     yadif->frame_pending = (yadif->mode&1) && !is_second;

     return ret;

 }
 

 static int filter_frame(AVFilterLink *link, AVFilterBufferRef *picref)

 {
     AVFilterContext *ctx = link->dst;
     YADIFContext *yadif = ctx->priv;
 

     av_assert0(picref);
 

     if (yadif->frame_pending)

         return_frame(ctx, 1);
 
     if (yadif->prev)
         avfilter_unref_buffer(yadif->prev);
     yadif->prev = yadif->cur;
     yadif->cur  = yadif->next;
     yadif->next = picref;
 

     if (!yadif->cur)

         return 0;

     if (yadif->deint && !yadif->cur->video->interlaced) {

         yadif->out  = avfilter_ref_buffer(yadif->cur, ~AV_PERM_WRITE);

         if (!yadif->out)
             return AVERROR(ENOMEM);
 

         avfilter_unref_bufferp(&yadif->prev);

         if (yadif->out->pts != AV_NOPTS_VALUE)
             yadif->out->pts *= 2;

         return ff_filter_frame(ctx->outputs[0], yadif->out);

     }
 

     if (!yadif->prev &&

         !(yadif->prev = avfilter_ref_buffer(yadif->cur, ~AV_PERM_WRITE)))

         return AVERROR(ENOMEM);

     yadif->out = ff_get_video_buffer(ctx->outputs[0], PERM_RWP,
                                      link->w, link->h);

     if (!yadif->out)
         return AVERROR(ENOMEM);

     avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
     yadif->out->video->interlaced = 0;

     if (yadif->out->pts != AV_NOPTS_VALUE)
         yadif->out->pts *= 2;

     return return_frame(ctx, 0);

 }
 
 static int request_frame(AVFilterLink *link)
 {
     AVFilterContext *ctx = link->src;
     YADIFContext *yadif = ctx->priv;
 

     if (yadif->frame_pending) {

         return_frame(ctx, 1);
         return 0;
     }
 

     do {

         int ret;
 

         if (yadif->eof)
             return AVERROR_EOF;
 

         ret  = ff_request_frame(link->src->inputs[0]);

         if (ret == AVERROR_EOF && yadif->cur) {

             AVFilterBufferRef *next = avfilter_ref_buffer(yadif->next, ~AV_PERM_WRITE);

             if (!next)
                 return AVERROR(ENOMEM);
 

             next->pts = yadif->next->pts * 2 - yadif->cur->pts;
 

             filter_frame(link->src->inputs[0], next);

             yadif->eof = 1;
         } else if (ret < 0) {

             return ret;

         }

     } while (!yadif->cur);

 
     return 0;
 }
 

 #define OFFSET(x) offsetof(YADIFContext, x)
 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
 

 #define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, INT_MIN, INT_MAX, FLAGS, unit }
 

 static const AVOption yadif_options[] = {

     { "mode",   "specify the interlacing mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=YADIF_MODE_SEND_FRAME}, 0, 3, FLAGS, "mode"},
     CONST("send_frame",           "send one frame for each frame",                                     YADIF_MODE_SEND_FRAME,           "mode"),
     CONST("send_field",           "send one frame for each field",                                     YADIF_MODE_SEND_FIELD,           "mode"),
     CONST("send_frame_nospatial", "send one frame for each frame, but skip spatial interlacing check", YADIF_MODE_SEND_FRAME_NOSPATIAL, "mode"),
     CONST("send_field_nospatial", "send one frame for each field, but skip spatial interlacing check", YADIF_MODE_SEND_FIELD_NOSPATIAL, "mode"),
 
     { "parity", "specify the assumed picture field parity", OFFSET(parity), AV_OPT_TYPE_INT, {.i64=YADIF_PARITY_AUTO}, -1, 1, FLAGS, "parity" },
     CONST("tff",  "assume top field first",    YADIF_PARITY_TFF,  "parity"),
     CONST("bff",  "assume bottom field first", YADIF_PARITY_BFF,  "parity"),
     CONST("auto", "auto detect parity",        YADIF_PARITY_AUTO, "parity"),
 
     { "deint", "specify which frames to deinterlace", OFFSET(deint), AV_OPT_TYPE_INT, {.i64=YADIF_DEINT_ALL}, 0, 1, FLAGS, "deint" },
     CONST("all",        "deinterlace all frames",                       YADIF_DEINT_ALL,         "deint"),
     CONST("interlaced", "only deinterlace frames marked as interlaced", YADIF_DEINT_INTERLACED,  "deint"),
 

     {NULL},
 };
 
 AVFILTER_DEFINE_CLASS(yadif);
 

 static av_cold void uninit(AVFilterContext *ctx)
 {
     YADIFContext *yadif = ctx->priv;
 

     avfilter_unref_bufferp(&yadif->prev);
     avfilter_unref_bufferp(&yadif->cur );
     avfilter_unref_bufferp(&yadif->next);

     av_opt_free(yadif);

 }
 
 static int query_formats(AVFilterContext *ctx)
 {

     static const enum AVPixelFormat pix_fmts[] = {
         AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_YUV422P,
         AV_PIX_FMT_YUV444P,
         AV_PIX_FMT_YUV410P,
         AV_PIX_FMT_YUV411P,
         AV_PIX_FMT_GRAY8,
         AV_PIX_FMT_YUVJ420P,
         AV_PIX_FMT_YUVJ422P,
         AV_PIX_FMT_YUVJ444P,
         AV_NE( AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY16LE ),
         AV_PIX_FMT_YUV440P,
         AV_PIX_FMT_YUVJ440P,

         AV_NE( AV_PIX_FMT_YUV420P9BE,  AV_PIX_FMT_YUV420P9LE ),
         AV_NE( AV_PIX_FMT_YUV422P9BE,  AV_PIX_FMT_YUV422P9LE ),
         AV_NE( AV_PIX_FMT_YUV444P9BE,  AV_PIX_FMT_YUV444P9LE ),

         AV_NE( AV_PIX_FMT_YUV420P10BE, AV_PIX_FMT_YUV420P10LE ),
         AV_NE( AV_PIX_FMT_YUV422P10BE, AV_PIX_FMT_YUV422P10LE ),
         AV_NE( AV_PIX_FMT_YUV444P10BE, AV_PIX_FMT_YUV444P10LE ),

         AV_NE( AV_PIX_FMT_YUV420P12BE, AV_PIX_FMT_YUV420P12LE ),
         AV_NE( AV_PIX_FMT_YUV422P12BE, AV_PIX_FMT_YUV422P12LE ),
         AV_NE( AV_PIX_FMT_YUV444P12BE, AV_PIX_FMT_YUV444P12LE ),
         AV_NE( AV_PIX_FMT_YUV420P14BE, AV_PIX_FMT_YUV420P14LE ),
         AV_NE( AV_PIX_FMT_YUV422P14BE, AV_PIX_FMT_YUV422P14LE ),
         AV_NE( AV_PIX_FMT_YUV444P14BE, AV_PIX_FMT_YUV444P14LE ),

         AV_NE( AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_YUV420P16LE ),
         AV_NE( AV_PIX_FMT_YUV422P16BE, AV_PIX_FMT_YUV422P16LE ),
         AV_NE( AV_PIX_FMT_YUV444P16BE, AV_PIX_FMT_YUV444P16LE ),
         AV_PIX_FMT_YUVA420P,

         AV_PIX_FMT_YUVA422P,
         AV_PIX_FMT_YUVA444P,

         AV_PIX_FMT_NONE

     };
 

     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

 
     return 0;
 }
 

 static av_cold int init(AVFilterContext *ctx, const char *args)

 {
     YADIFContext *yadif = ctx->priv;

     static const char *shorthand[] = { "mode", "parity", "deint", NULL };

     int ret;

     yadif->class = &yadif_class;
     av_opt_set_defaults(yadif);
 
     if ((ret = av_opt_set_from_string(yadif, args, shorthand, "=", ":")) < 0)
         return ret;

     av_log(ctx, AV_LOG_VERBOSE, "mode:%d parity:%d deint:%d\n",
            yadif->mode, yadif->parity, yadif->deint);

 
     return 0;
 }
 

 static int config_props(AVFilterLink *link)
 {

     AVFilterContext *ctx = link->src;

     YADIFContext *s = link->src->priv;

     link->time_base.num = link->src->inputs[0]->time_base.num;
     link->time_base.den = link->src->inputs[0]->time_base.den * 2;
     link->w             = link->src->inputs[0]->w;
     link->h             = link->src->inputs[0]->h;
 

     if(s->mode&1)

         link->frame_rate = av_mul_q(link->src->inputs[0]->frame_rate, (AVRational){2,1});
 

     if (link->w < 3 || link->h < 3) {
         av_log(ctx, AV_LOG_ERROR, "Video of less than 3 columns or lines is not supported\n");
         return AVERROR(EINVAL);
     }
 

     s->csp = av_pix_fmt_desc_get(link->format);
     if (s->csp->comp[0].depth_minus1 / 8 == 1) {

         s->filter_line  = filter_line_c_16bit;
         s->filter_edges = filter_edges_16bit;

     } else {

         s->filter_line  = filter_line_c;
         s->filter_edges = filter_edges;

 
         if (ARCH_X86)
             ff_yadif_init_x86(s);
     }
 

     return 0;
 }
 

 static const AVFilterPad avfilter_vf_yadif_inputs[] = {
     {
         .name             = "default",
         .type             = AVMEDIA_TYPE_VIDEO,

         .filter_frame     = filter_frame,

         .min_perms        = AV_PERM_PRESERVE,

     },
     { NULL }
 };
 
 static const AVFilterPad avfilter_vf_yadif_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .request_frame = request_frame,
         .config_props  = config_props,
     },
     { NULL }
 };
 

 AVFilter avfilter_vf_yadif = {
     .name          = "yadif",

     .description   = NULL_IF_CONFIG_SMALL("Deinterlace the input image."),

 
     .priv_size     = sizeof(YADIFContext),
     .init          = init,
     .uninit        = uninit,
     .query_formats = query_formats,
 

     .inputs    = avfilter_vf_yadif_inputs,
     .outputs   = avfilter_vf_yadif_outputs,

 
     .priv_class = &yadif_class,

 };