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 /* TODO: set the buffer's priv member to a context structure for the whole
  33  * filter chain.  This will allow for a buffer pool instead of the constant
  34  * alloc & free cycle currently implemented. */
  35 AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
  36 {
  37     AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
  38     AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
  39     int i, tempsize;
  40     char *buf;
  41
  42     ref->pic   = pic;
  43     ref->w     = link->w;
  44     ref->h     = link->h;
  45
  46     /* make sure the buffer gets read permission or it's useless for output */
  47     ref->perms = perms | AV_PERM_READ;
  48
  49     pic->refcount = 1;
  50     pic->format   = link->format;
  51     pic->free     = avfilter_default_free_video_buffer;
  52     ff_fill_linesize((AVPicture *)pic, pic->format, ref->w);
  53
  54     for (i=0; i<4;i++)
  55         pic->linesize[i] = FFALIGN(pic->linesize[i], 16);
  56
  57     tempsize = ff_fill_pointer((AVPicture *)pic, NULL, pic->format, ref->h);
  58     buf = av_malloc(tempsize);
  59     ff_fill_pointer((AVPicture *)pic, buf, pic->format, ref->h);
  60
  61     memcpy(ref->data,     pic->data,     sizeof(pic->data));
  62     memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
  63
  64     return ref;
  65 }
  66
  67 void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
  68 {
  69     AVFilterLink *out = NULL;
  70
  71     if(link->dst->output_count)
  72         out = link->dst->outputs[0];
  73
  74     if(out) {
  75         out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE);
  76         out->outpic->pts = picref->pts;
  77         avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
  78     }
  79 }
  80
  81 void avfilter_default_draw_slice(AVFilterLink *link, int y, int h)
  82 {
  83     AVFilterLink *out = NULL;
  84
  85     if(link->dst->output_count)
  86         out = link->dst->outputs[0];
  87
  88     if(out)
  89         avfilter_draw_slice(out, y, h);
  90 }
  91
  92 void avfilter_default_end_frame(AVFilterLink *link)
  93 {
  94     AVFilterLink *out = NULL;
  95
  96     if(link->dst->output_count)
  97         out = link->dst->outputs[0];
  98
  99     avfilter_unref_pic(link->cur_pic);
 100     link->cur_pic = NULL;
 101
 102     if(out) {
 103         if(out->outpic) {
 104             avfilter_unref_pic(out->outpic);
 105             out->outpic = NULL;
 106         }
 107         avfilter_end_frame(out);
 108     }
 109 }
 110
 111 /**
 112  * default config_link() implementation for output video links to simplify
 113  * the implementation of one input one output video filters */
 114 int avfilter_default_config_output_link(AVFilterLink *link)
 115 {
 116     if(link->src->input_count && link->src->inputs[0]) {
 117         link->w = link->src->inputs[0]->w;
 118         link->h = link->src->inputs[0]->h;
 119     } else {
 120         /* XXX: any non-simple filter which would cause this branch to be taken
 121          * really should implement its own config_props() for this link. */
 122         return -1;
 123     }
 124
 125     return 0;
 126 }
 127
 128 /**
 129  * A helper for query_formats() which sets all links to the same list of
 130  * formats. If there are no links hooked to this filter, the list of formats is
 131  * freed.
 132  *
 133  * FIXME: this will need changed for filters with a mix of pad types
 134  * (video + audio, etc)
 135  */
 136 void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 137 {
 138     int count = 0, i;
 139
 140     for(i = 0; i < ctx->input_count; i ++) {
 141         if(ctx->inputs[i]) {
 142             avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
 143             count ++;
 144         }
 145     }
 146     for(i = 0; i < ctx->output_count; i ++) {
 147         if(ctx->outputs[i]) {
 148             avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
 149             count ++;
 150         }
 151     }
 152
 153     if(!count) {
 154         av_free(formats->formats);
 155         av_free(formats->refs);
 156         av_free(formats);
 157     }
 158 }
 159
 160 int avfilter_default_query_formats(AVFilterContext *ctx)
 161 {
 162     avfilter_set_common_formats(ctx, avfilter_all_colorspaces());
 163     return 0;
 164 }
 165