/*
  * Filter layer - default implementations
  * copyright (c) 2007 Bobby Bingham
  *
  * 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 "libavcodec/imgconvert.h"

 #include "avfilter.h"
 
 /* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */
 void avfilter_default_free_video_buffer(AVFilterPic *pic)
 {

     av_free(pic->data[0]);

     av_free(pic);
 }
 

 #define ALIGN(a) do{ \
                      (a) = ((a) + 15) & (~15); \
                  } while(0);
 

 /* TODO: set the buffer's priv member to a context structure for the whole
  * filter chain.  This will allow for a buffer pool instead of the constant
  * alloc & free cycle currently implemented. */
 AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
 {
     AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
     AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));

     int i, tempsize;
     char *buf;

 
     ref->pic   = pic;
     ref->w     = link->w;
     ref->h     = link->h;

 
     /* make sure the buffer gets read permission or it's useless for output */
     ref->perms = perms | AV_PERM_READ;

 
     pic->refcount = 1;
     pic->format   = link->format;
     pic->free     = avfilter_default_free_video_buffer;

     ff_fill_linesize((AVPicture *)pic, pic->format, ref->w);
 
     for (i=0; i<4;i++)
         ALIGN(pic->linesize[i]);
 
     tempsize = ff_fill_pointer((AVPicture *)pic, NULL, pic->format, ref->h);
     buf = av_malloc(tempsize);
     ff_fill_pointer((AVPicture *)pic, buf, pic->format, ref->h);

 
     memcpy(ref->data,     pic->data,     sizeof(pic->data));
     memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
 
     return ref;
 }
 
 void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
 {
     AVFilterLink *out = NULL;
 
     if(link->dst->output_count)
         out = link->dst->outputs[0];
 
     if(out) {
         out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE);
         out->outpic->pts = picref->pts;

         avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));

     }
 }
 

 void avfilter_default_draw_slice(AVFilterLink *link, int y, int h)
 {
     AVFilterLink *out = NULL;
 
     if(link->dst->output_count)
         out = link->dst->outputs[0];
 
     if(out)
         avfilter_draw_slice(out, y, h);
 }
 

 void avfilter_default_end_frame(AVFilterLink *link)
 {
     AVFilterLink *out = NULL;
 
     if(link->dst->output_count)
         out = link->dst->outputs[0];
 
     avfilter_unref_pic(link->cur_pic);
     link->cur_pic = NULL;
 
     if(out) {

         if(out->outpic) {

             avfilter_unref_pic(out->outpic);
             out->outpic = NULL;

         }

         avfilter_end_frame(out);
     }
 }
 
 /**
  * default config_link() implementation for output video links to simplify
  * the implementation of one input one output video filters */
 int avfilter_default_config_output_link(AVFilterLink *link)
 {
     if(link->src->input_count && link->src->inputs[0]) {
         link->w = link->src->inputs[0]->w;
         link->h = link->src->inputs[0]->h;
     } else {
         /* XXX: any non-simple filter which would cause this branch to be taken
          * really should implement its own config_props() for this link. */

         return -1;

     }
 
     return 0;
 }
 
 /**

  * A helper for query_formats() which sets all links to the same list of
  * formats. If there are no links hooked to this filter, the list of formats is
  * freed.
  *
  * FIXME: this will need changed for filters with a mix of pad types
  * (video + audio, etc)
  */
 void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)

 {

     int count = 0, i;
 
     for(i = 0; i < ctx->input_count; i ++) {
         if(ctx->inputs[i]) {
             avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
             count ++;
         }
     }
     for(i = 0; i < ctx->output_count; i ++) {
         if(ctx->outputs[i]) {
             avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
             count ++;
         }
     }
 
     if(!count) {
         av_free(formats->formats);
         av_free(formats->refs);
         av_free(formats);
     }
 }
 
 int avfilter_default_query_formats(AVFilterContext *ctx)
 {
     avfilter_set_common_formats(ctx, avfilter_all_colorspaces());
     return 0;

 }