• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavfilter/defaults.c

Go to the documentation of this file.
00001 /*
00002  * Filter layer - default implementations
00003  * copyright (c) 2007 Bobby Bingham
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavcodec/imgconvert.h"
00023 #include "avfilter.h"
00024 
00025 /* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */
00026 static void avfilter_default_free_video_buffer(AVFilterPic *pic)
00027 {
00028     av_free(pic->data[0]);
00029     av_free(pic);
00030 }
00031 
00032 /* TODO: set the buffer's priv member to a context structure for the whole
00033  * filter chain.  This will allow for a buffer pool instead of the constant
00034  * alloc & free cycle currently implemented. */
00035 AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
00036 {
00037     AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
00038     AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
00039     int i, tempsize;
00040     char *buf;
00041 
00042     ref->pic   = pic;
00043     ref->w     = pic->w = w;
00044     ref->h     = pic->h = h;
00045 
00046     /* make sure the buffer gets read permission or it's useless for output */
00047     ref->perms = perms | AV_PERM_READ;
00048 
00049     pic->refcount = 1;
00050     pic->format   = link->format;
00051     pic->free     = avfilter_default_free_video_buffer;
00052     ff_fill_linesize((AVPicture *)pic, pic->format, ref->w);
00053 
00054     for (i=0; i<4;i++)
00055         pic->linesize[i] = FFALIGN(pic->linesize[i], 16);
00056 
00057     tempsize = ff_fill_pointer((AVPicture *)pic, NULL, pic->format, ref->h);
00058     buf = av_malloc(tempsize);
00059     ff_fill_pointer((AVPicture *)pic, buf, pic->format, ref->h);
00060 
00061     memcpy(ref->data,     pic->data,     sizeof(pic->data));
00062     memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
00063 
00064     return ref;
00065 }
00066 
00067 void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
00068 {
00069     AVFilterLink *out = NULL;
00070 
00071     if(link->dst->output_count)
00072         out = link->dst->outputs[0];
00073 
00074     if(out) {
00075         out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE, out->w, out->h);
00076         out->outpic->pts = picref->pts;
00077         out->outpic->pos = picref->pos;
00078         out->outpic->pixel_aspect = picref->pixel_aspect;
00079         avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
00080     }
00081 }
00082 
00083 void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
00084 {
00085     AVFilterLink *out = NULL;
00086 
00087     if(link->dst->output_count)
00088         out = link->dst->outputs[0];
00089 
00090     if(out)
00091         avfilter_draw_slice(out, y, h, slice_dir);
00092 }
00093 
00094 void avfilter_default_end_frame(AVFilterLink *link)
00095 {
00096     AVFilterLink *out = NULL;
00097 
00098     if(link->dst->output_count)
00099         out = link->dst->outputs[0];
00100 
00101     avfilter_unref_pic(link->cur_pic);
00102     link->cur_pic = NULL;
00103 
00104     if(out) {
00105         if(out->outpic) {
00106             avfilter_unref_pic(out->outpic);
00107             out->outpic = NULL;
00108         }
00109         avfilter_end_frame(out);
00110     }
00111 }
00112 
00116 int avfilter_default_config_output_link(AVFilterLink *link)
00117 {
00118     if(link->src->input_count && link->src->inputs[0]) {
00119         link->w = link->src->inputs[0]->w;
00120         link->h = link->src->inputs[0]->h;
00121     } else {
00122         /* XXX: any non-simple filter which would cause this branch to be taken
00123          * really should implement its own config_props() for this link. */
00124         return -1;
00125     }
00126 
00127     return 0;
00128 }
00129 
00138 void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
00139 {
00140     int count = 0, i;
00141 
00142     for(i = 0; i < ctx->input_count; i ++) {
00143         if(ctx->inputs[i]) {
00144             avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
00145             count ++;
00146         }
00147     }
00148     for(i = 0; i < ctx->output_count; i ++) {
00149         if(ctx->outputs[i]) {
00150             avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
00151             count ++;
00152         }
00153     }
00154 
00155     if(!count) {
00156         av_free(formats->formats);
00157         av_free(formats->refs);
00158         av_free(formats);
00159     }
00160 }
00161 
00162 int avfilter_default_query_formats(AVFilterContext *ctx)
00163 {
00164     avfilter_set_common_formats(ctx, avfilter_all_colorspaces());
00165     return 0;
00166 }
00167 
00168 void avfilter_null_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
00169 {
00170     avfilter_start_frame(link->dst->outputs[0], picref);
00171 }
00172 
00173 void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
00174 {
00175     avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
00176 }
00177 
00178 void avfilter_null_end_frame(AVFilterLink *link)
00179 {
00180     avfilter_end_frame(link->dst->outputs[0]);
00181 }
00182 
00183 AVFilterPicRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
00184 {
00185     return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
00186 }
00187 

Generated on Fri Sep 16 2011 17:17:47 for FFmpeg by  doxygen 1.7.1