libavfilter/video.c

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