/*

  * Copyright 2007 Bobby Bingham
  * Copyright Stefano Sabatini <stefasab gmail com>
  * Copyright Vitor Sessak <vitor1001 gmail com>
  *

  * 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 <string.h>

 #include <stdio.h>

 #include "libavutil/avassert.h"

 #include "libavutil/buffer.h"

 #include "libavutil/hwcontext.h"

 #include "libavutil/imgutils.h"

 #include "libavutil/mem.h"

 
 #include "avfilter.h"
 #include "internal.h"

 #include "video.h"

 #define BUFFER_ALIGN 32
 
 

 AVFrame *ff_null_get_video_buffer(AVFilterLink *link, int w, int h)

 {

     return ff_get_video_buffer(link->dst->outputs[0], w, h);

 }
 

 AVFrame *ff_default_get_video_buffer(AVFilterLink *link, int w, int h)

 {

     int pool_width = 0;
     int pool_height = 0;
     int pool_align = 0;
     enum AVPixelFormat pool_format = AV_PIX_FMT_NONE;

     if (link->hw_frames_ctx &&
         ((AVHWFramesContext*)link->hw_frames_ctx->data)->format == link->format) {

         int ret;
         AVFrame *frame = av_frame_alloc();
 
         if (!frame)
             return NULL;
 

         ret = av_hwframe_get_buffer(link->hw_frames_ctx, frame, 0);

         if (ret < 0)
             av_frame_free(&frame);
 
         return frame;
     }
 

     if (!link->frame_pool) {
         link->frame_pool = ff_frame_pool_video_init(av_buffer_allocz, w, h,
                                                     link->format, BUFFER_ALIGN);
         if (!link->frame_pool)

             return NULL;
     } else {

         if (ff_frame_pool_get_video_config(link->frame_pool,

                                            &pool_width, &pool_height,
                                            &pool_format, &pool_align) < 0) {
             return NULL;
         }

         if (pool_width != w || pool_height != h ||
             pool_format != link->format || pool_align != BUFFER_ALIGN) {

             ff_frame_pool_uninit((FFFramePool **)&link->frame_pool);
             link->frame_pool = ff_frame_pool_video_init(av_buffer_allocz, w, h,
                                                         link->format, BUFFER_ALIGN);
             if (!link->frame_pool)

                 return NULL;
         }
     }

     return ff_frame_pool_get(link->frame_pool);

 }
 

 AVFrame *ff_get_video_buffer(AVFilterLink *link, int w, int h)

 {

     AVFrame *ret = NULL;

     FF_TPRINTF_START(NULL, get_video_buffer); ff_tlog_link(NULL, link, 0);

 
     if (link->dstpad->get_video_buffer)

         ret = link->dstpad->get_video_buffer(link, w, h);

 
     if (!ret)

         ret = ff_default_get_video_buffer(link, w, h);

 
     return ret;
 }