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  1. /*
  2.  * Copyright 2007 Bobby Bingham
  3.  * Copyright Stefano Sabatini <stefasab gmail com>
  4.  * Copyright Vitor Sessak <vitor1001 gmail com>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include <string.h>
  24. #include <stdio.h>
  25.  
  26. #include "libavutil/avassert.h"
  27. #include "libavutil/buffer.h"
  28. #include "libavutil/imgutils.h"
  29. #include "libavutil/mem.h"
  30.  
  31. #include "avfilter.h"
  32. #include "internal.h"
  33. #include "video.h"
  34.  
  35. AVFrame *ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
  36. {
  37.     return ff_get_video_buffer(link->dst->outputs[0], w, h);
  38. }
  39.  
  40. /* TODO: set the buffer's priv member to a context structure for the whole
  41.  * filter chain.  This will allow for a buffer pool instead of the constant
  42.  * alloc & free cycle currently implemented. */
  43. AVFrame *ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
  44. {
  45.     AVFrame *frame = av_frame_alloc();
  46.     int ret;
  47.  
  48.     if (!frame)
  49.         return NULL;
  50.  
  51.     frame->width  = w;
  52.     frame->height = h;
  53.     frame->format = link->format;
  54.  
  55.     ret = av_frame_get_buffer(frame, 32);
  56.     if (ret < 0)
  57.         av_frame_free(&frame);
  58.  
  59.     return frame;
  60. }
  61.  
  62. #if FF_API_AVFILTERBUFFER
  63. AVFilterBufferRef *
  64. avfilter_get_video_buffer_ref_from_arrays(uint8_t * const data[4], const int linesize[4], int perms,
  65.                                           int w, int h, enum AVPixelFormat format)
  66. {
  67.     AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
  68.     AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
  69.  
  70.     if (!pic || !picref)
  71.         goto fail;
  72.  
  73.     picref->buf = pic;
  74.     picref->buf->free = ff_avfilter_default_free_buffer;
  75.     if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
  76.         goto fail;
  77.  
  78.     pic->w = picref->video->w = w;
  79.     pic->h = picref->video->h = h;
  80.  
  81.     /* make sure the buffer gets read permission or it's useless for output */
  82.     picref->perms = perms | AV_PERM_READ;
  83.  
  84.     pic->refcount = 1;
  85.     picref->type = AVMEDIA_TYPE_VIDEO;
  86.     pic->format = picref->format = format;
  87.  
  88.     memcpy(pic->data,        data,          4*sizeof(data[0]));
  89.     memcpy(pic->linesize,    linesize,      4*sizeof(linesize[0]));
  90.     memcpy(picref->data,     pic->data,     sizeof(picref->data));
  91.     memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
  92.  
  93.     pic->   extended_data = pic->data;
  94.     picref->extended_data = picref->data;
  95.  
  96.     picref->pts = AV_NOPTS_VALUE;
  97.  
  98.     return picref;
  99.  
  100. fail:
  101.     if (picref && picref->video)
  102.         av_free(picref->video);
  103.     av_free(picref);
  104.     av_free(pic);
  105.     return NULL;
  106. }
  107. #endif
  108.  
  109. AVFrame *ff_get_video_buffer(AVFilterLink *link, int w, int h)
  110. {
  111.     AVFrame *ret = NULL;
  112.  
  113.     av_unused char buf[16];
  114.     FF_TPRINTF_START(NULL, get_video_buffer); ff_tlog_link(NULL, link, 0);
  115.  
  116.     if (link->dstpad->get_video_buffer)
  117.         ret = link->dstpad->get_video_buffer(link, w, h);
  118.  
  119.     if (!ret)
  120.         ret = ff_default_get_video_buffer(link, w, h);
  121.  
  122.     return ret;
  123. }
  124.