/*

  * 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/imgutils.h"

 #include "libavutil/mem.h"

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

 #include "video.h"

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

 {

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

 }
 
 /* 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. */

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

 {

     AVFrame *frame = av_frame_alloc();
     int ret;

     if (!frame)

         return NULL;
 

     frame->width  = w;
     frame->height = h;
     frame->format = link->format;

     ret = av_frame_get_buffer(frame, 32);
     if (ret < 0)
         av_frame_free(&frame);

     return frame;

 }
 

 #if FF_API_AVFILTERBUFFER

 AVFilterBufferRef *

 avfilter_get_video_buffer_ref_from_arrays(uint8_t * const data[4], const int linesize[4], int perms,

                                           int w, int h, enum AVPixelFormat format)

 {
     AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
     AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
 
     if (!pic || !picref)
         goto fail;
 
     picref->buf = pic;
     picref->buf->free = ff_avfilter_default_free_buffer;
     if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
         goto fail;
 
     pic->w = picref->video->w = w;
     pic->h = picref->video->h = h;
 
     /* make sure the buffer gets read permission or it's useless for output */
     picref->perms = perms | AV_PERM_READ;
 
     pic->refcount = 1;
     picref->type = AVMEDIA_TYPE_VIDEO;
     pic->format = picref->format = format;
 
     memcpy(pic->data,        data,          4*sizeof(data[0]));
     memcpy(pic->linesize,    linesize,      4*sizeof(linesize[0]));
     memcpy(picref->data,     pic->data,     sizeof(picref->data));
     memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
 
     pic->   extended_data = pic->data;
     picref->extended_data = picref->data;
 

     picref->pts = AV_NOPTS_VALUE;
 

     return picref;
 
 fail:
     if (picref && picref->video)
         av_free(picref->video);
     av_free(picref);
     av_free(pic);
     return NULL;
 }

 #endif

 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;
 }