libavfilter/defaults.c

   1 /*
   2  * Filter layer - default implementations
   3  * copyright (c) 2007 Bobby Bingham
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavcodec/imgconvert.h"
  23 #include "avfilter.h"
  24
  25 /* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */
  26 void avfilter_default_free_video_buffer(AVFilterPic *pic)
  27 {
  28     av_free(pic->data[0]);
  29     av_free(pic);
  30 }
  31
  32 #define ALIGN(a) do{ \
  33                      (a) = ((a) + 15) & (~15); \
  34                  } while(0);
  35
  36 /* TODO: set the buffer's priv member to a context structure for the whole
  37  * filter chain.  This will allow for a buffer pool instead of the constant
  38  * alloc & free cycle currently implemented. */
  39 AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
  40 {
  41     AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
  42     AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
  43     int i, tempsize;
  44     char *buf;
  45
  46     ref->pic   = pic;
  47     ref->w     = link->w;
  48     ref->h     = link->h;
  49
  50     /* make sure the buffer gets read permission or it's useless for output */
  51     ref->perms = perms | AV_PERM_READ;
  52
  53     pic->refcount = 1;
  54     pic->format   = link->format;
  55     pic->free     = avfilter_default_free_video_buffer;
  56     ff_fill_linesize((AVPicture *)pic, pic->format, ref->w);
  57
  58     for (i=0; i<4;i++)
  59         ALIGN(pic->linesize[i]);
  60
  61     tempsize = ff_fill_pointer((AVPicture *)pic, NULL, pic->format, ref->h);
  62     buf = av_malloc(tempsize);
  63     ff_fill_pointer((AVPicture *)pic, buf, pic->format, ref->h);
  64
  65     memcpy(ref->data,     pic->data,     sizeof(pic->data));
  66     memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
  67
  68     return ref;
  69 }
  70
  71 void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
  72 {
  73     AVFilterLink *out = NULL;
  74
  75     if(link->dst->output_count)
  76         out = link->dst->outputs[0];
  77
  78     if(out) {
  79         out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE);
  80         out->outpic->pts = picref->pts;
  81         avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
  82     }
  83 }
  84
  85 void avfilter_default_end_frame(AVFilterLink *link)
  86 {
  87     AVFilterLink *out = NULL;
  88
  89     if(link->dst->output_count)
  90         out = link->dst->outputs[0];
  91
  92     avfilter_unref_pic(link->cur_pic);
  93     link->cur_pic = NULL;
  94
  95     if(out) {
  96         if(out->outpic) {
  97             avfilter_unref_pic(out->outpic);
  98             out->outpic = NULL;
  99         }
 100         avfilter_end_frame(out);
 101     }
 102 }
 103
 104 /**
 105  * default config_link() implementation for output video links to simplify
 106  * the implementation of one input one output video filters */
 107 int avfilter_default_config_output_link(AVFilterLink *link)
 108 {
 109     if(link->src->input_count && link->src->inputs[0]) {
 110         link->w = link->src->inputs[0]->w;
 111         link->h = link->src->inputs[0]->h;
 112     } else {
 113         /* XXX: any non-simple filter which would cause this branch to be taken
 114          * really should implement its own config_props() for this link. */
 115         return -1;
 116     }
 117
 118     return 0;
 119 }
 120
 121 /**
 122  * A helper for query_formats() which sets all links to the same list of
 123  * formats. If there are no links hooked to this filter, the list of formats is
 124  * freed.
 125  *
 126  * FIXME: this will need changed for filters with a mix of pad types
 127  * (video + audio, etc)
 128  */
 129 void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 130 {
 131     int count = 0, i;
 132
 133     for(i = 0; i < ctx->input_count; i ++) {
 134         if(ctx->inputs[i]) {
 135             avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
 136             count ++;
 137         }
 138     }
 139     for(i = 0; i < ctx->output_count; i ++) {
 140         if(ctx->outputs[i]) {
 141             avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
 142             count ++;
 143         }
 144     }
 145
 146     if(!count) {
 147         av_free(formats->formats);
 148         av_free(formats->refs);
 149         av_free(formats);
 150     }
 151 }
 152
 153 int avfilter_default_query_formats(AVFilterContext *ctx)
 154 {
 155     avfilter_set_common_formats(ctx, avfilter_all_colorspaces());
 156     return 0;
 157 }
 158