/*

  * Copyright (c) 2010 Stefano Sabatini
  * Copyright (c) 2008 Vitor Sessak

  *
  * 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
  * transposition filter
  * Based on MPlayer libmpcodecs/vf_rotate.c.
  */
 

 #include <stdio.h>
 

 #include "libavutil/intreadwrite.h"
 #include "libavutil/pixdesc.h"

 #include "libavutil/imgutils.h"

 #include "libavutil/internal.h"

 #include "libavutil/opt.h"

 #include "avfilter.h"

 #include "formats.h"

 #include "internal.h"

 #include "video.h"

 typedef enum {
     TRANSPOSE_PT_TYPE_NONE,
     TRANSPOSE_PT_TYPE_LANDSCAPE,
     TRANSPOSE_PT_TYPE_PORTRAIT,
 } PassthroughType;
 

 enum TransposeDir {
     TRANSPOSE_CCLOCK_FLIP,
     TRANSPOSE_CLOCK,
     TRANSPOSE_CCLOCK,
     TRANSPOSE_CLOCK_FLIP,
 };
 

 typedef struct {

     const AVClass *class;

     int hsub, vsub;
     int pixsteps[4];
 

     PassthroughType passthrough; ///< landscape passthrough mode enabled

     enum TransposeDir dir;

 } TransContext;
 
 static int query_formats(AVFilterContext *ctx)
 {

     AVFilterFormats *pix_fmts = NULL;
     int fmt;
 
     for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);

         if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
               desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
               desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ||

               desc->log2_chroma_w != desc->log2_chroma_h))
             ff_add_format(&pix_fmts, fmt);
     }
 
 
     ff_set_common_formats(ctx, pix_fmts);

     return 0;
 }
 
 static int config_props_output(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     TransContext *trans = ctx->priv;
     AVFilterLink *inlink = ctx->inputs[0];

     const AVPixFmtDescriptor *desc_out = av_pix_fmt_desc_get(outlink->format);
     const AVPixFmtDescriptor *desc_in  = av_pix_fmt_desc_get(inlink->format);

     if (trans->dir&4) {

         av_log(ctx, AV_LOG_WARNING,
                "dir values greater than 3 are deprecated, use the passthrough option instead\n");

         trans->dir &= 3;

         trans->passthrough = TRANSPOSE_PT_TYPE_LANDSCAPE;
     }
 
     if ((inlink->w >= inlink->h && trans->passthrough == TRANSPOSE_PT_TYPE_LANDSCAPE) ||
         (inlink->w <= inlink->h && trans->passthrough == TRANSPOSE_PT_TYPE_PORTRAIT)) {
         av_log(ctx, AV_LOG_VERBOSE,
                "w:%d h:%d -> w:%d h:%d (passthrough mode)\n",
                inlink->w, inlink->h, inlink->w, inlink->h);
         return 0;
     } else {
         trans->passthrough = TRANSPOSE_PT_TYPE_NONE;

     }
 

     trans->hsub = desc_in->log2_chroma_w;
     trans->vsub = desc_in->log2_chroma_h;

     av_image_fill_max_pixsteps(trans->pixsteps, NULL, desc_out);

 
     outlink->w = inlink->h;
     outlink->h = inlink->w;
 

     if (inlink->sample_aspect_ratio.num){
         outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);
     } else
         outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
 

     av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",

            inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
            trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
            trans->dir == 0 || trans->dir == 3);
     return 0;
 }
 

 static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)

 {
     TransContext *trans = inlink->dst->priv;
 
     return trans->passthrough ?

         ff_null_get_video_buffer   (inlink, w, h) :
         ff_default_get_video_buffer(inlink, w, h);

 }
 

 typedef struct ThreadData {
     AVFrame *in, *out;
 } ThreadData;
 
 static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr,
                         int nb_jobs)

 {

     TransContext *trans = ctx->priv;
     ThreadData *td = arg;
     AVFrame *out = td->out;
     AVFrame *in = td->in;

     int plane;

     for (plane = 0; out->data[plane]; plane++) {

         int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
         int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
         int pixstep = trans->pixsteps[plane];

         int inh  = in->height  >> vsub;

         int outw = FF_CEIL_RSHIFT(out->width,  hsub);
         int outh = FF_CEIL_RSHIFT(out->height, vsub);

         int start = (outh *  jobnr   ) / nb_jobs;
         int end   = (outh * (jobnr+1)) / nb_jobs;

         uint8_t *dst, *src;
         int dstlinesize, srclinesize;

         int x, y;
 

         dstlinesize = out->linesize[plane];

         dst = out->data[plane] + start * dstlinesize;

         src = in->data[plane];
         srclinesize = in->linesize[plane];

 
         if (trans->dir&1) {

             src +=  in->linesize[plane] * (inh-1);
             srclinesize *= -1;

         }
 
         if (trans->dir&2) {

             dst = out->data[plane] + dstlinesize * (outh-start-1);

             dstlinesize *= -1;

         }
 

         switch (pixstep) {
         case 1:
             for (y = start; y < end; y++, dst += dstlinesize)

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

                     dst[x] = src[x*srclinesize + y];

             break;
         case 2:
             for (y = start; y < end; y++, dst += dstlinesize) {

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

                     *((uint16_t *)(dst + 2*x)) = *((uint16_t *)(src + x*srclinesize + y*2));

             }
             break;
         case 3:
             for (y = start; y < end; y++, dst += dstlinesize) {

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

                     int32_t v = AV_RB24(src + x*srclinesize + y*3);
                     AV_WB24(dst + 3*x, v);

                 }

             }
             break;
         case 4:
             for (y = start; y < end; y++, dst += dstlinesize) {

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

                     *((uint32_t *)(dst + 4*x)) = *((uint32_t *)(src + x*srclinesize + y*4));

             }
             break;
         case 6:
             for (y = start; y < end; y++, dst += dstlinesize) {

                 for (x = 0; x < outw; x++) {
                     int64_t v = AV_RB48(src + x*srclinesize + y*6);
                     AV_WB48(dst + 6*x, v);
                 }

             }
             break;
         case 8:
             for (y = start; y < end; y++, dst += dstlinesize) {

                 for (x = 0; x < outw; x++)
                     *((uint64_t *)(dst + 8*x)) = *((uint64_t *)(src + x*srclinesize + y*8));

             }

             break;

         }
     }
 

     return 0;
 }
 
 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 {
     AVFilterContext *ctx = inlink->dst;
     TransContext *trans = ctx->priv;
     AVFilterLink *outlink = ctx->outputs[0];
     ThreadData td;
     AVFrame *out;
 
     if (trans->passthrough)
         return ff_filter_frame(outlink, in);
 
     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     if (!out) {
         av_frame_free(&in);
         return AVERROR(ENOMEM);
     }

     av_frame_copy_props(out, in);

 
     if (in->sample_aspect_ratio.num == 0) {
         out->sample_aspect_ratio = in->sample_aspect_ratio;
     } else {
         out->sample_aspect_ratio.num = in->sample_aspect_ratio.den;
         out->sample_aspect_ratio.den = in->sample_aspect_ratio.num;
     }
 
     td.in = in, td.out = out;
     ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outlink->h, ctx->graph->nb_threads));

     av_frame_free(&in);

     return ff_filter_frame(outlink, out);

 }

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

 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 
 static const AVOption transpose_options[] = {

     { "dir", "set transpose direction", OFFSET(dir), AV_OPT_TYPE_INT, { .i64 = TRANSPOSE_CCLOCK_FLIP }, 0, 7, FLAGS, "dir" },
         { "cclock_flip", "rotate counter-clockwise with vertical flip", 0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CCLOCK_FLIP }, .unit = "dir" },
         { "clock",       "rotate clockwise",                            0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CLOCK       }, .unit = "dir" },
         { "cclock",      "rotate counter-clockwise",                    0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CCLOCK      }, .unit = "dir" },
         { "clock_flip",  "rotate clockwise with vertical flip",         0, AV_OPT_TYPE_CONST, { .i64 = TRANSPOSE_CLOCK_FLIP  }, .unit = "dir" },

 
     { "passthrough", "do not apply transposition if the input matches the specified geometry",
       OFFSET(passthrough), AV_OPT_TYPE_INT, {.i64=TRANSPOSE_PT_TYPE_NONE},  0, INT_MAX, FLAGS, "passthrough" },

         { "none",      "always apply transposition",   0, AV_OPT_TYPE_CONST, {.i64=TRANSPOSE_PT_TYPE_NONE},      INT_MIN, INT_MAX, FLAGS, "passthrough" },
         { "portrait",  "preserve portrait geometry",   0, AV_OPT_TYPE_CONST, {.i64=TRANSPOSE_PT_TYPE_PORTRAIT},  INT_MIN, INT_MAX, FLAGS, "passthrough" },
         { "landscape", "preserve landscape geometry",  0, AV_OPT_TYPE_CONST, {.i64=TRANSPOSE_PT_TYPE_LANDSCAPE}, INT_MIN, INT_MAX, FLAGS, "passthrough" },

     { NULL }

 };
 

 AVFILTER_DEFINE_CLASS(transpose);

 static const AVFilterPad avfilter_vf_transpose_inputs[] = {
     {

         .name             = "default",
         .type             = AVMEDIA_TYPE_VIDEO,
         .get_video_buffer = get_video_buffer,
         .filter_frame     = filter_frame,

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

 AVFilter ff_vf_transpose = {

     .name          = "transpose",
     .description   = NULL_IF_CONFIG_SMALL("Transpose input video."),
     .priv_size     = sizeof(TransContext),
     .priv_class    = &transpose_class,

     .query_formats = query_formats,

     .inputs        = avfilter_vf_transpose_inputs,
     .outputs       = avfilter_vf_transpose_outputs,
     .flags         = AVFILTER_FLAG_SLICE_THREADS,

 };