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 void avfilter_default_free_video_buffer(AVFilterPic *pic) 00027 { 00028 av_free(pic->data[0]); 00029 av_free(pic); 00030 } 00031 00032 #define ALIGN(a) do{ \ 00033 (a) = ((a) + 15) & (~15); \ 00034 } while(0); 00035 00036 /* TODO: set the buffer's priv member to a context structure for the whole 00037 * filter chain. This will allow for a buffer pool instead of the constant 00038 * alloc & free cycle currently implemented. */ 00039 AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms) 00040 { 00041 AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic)); 00042 AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef)); 00043 int i, tempsize; 00044 char *buf; 00045 00046 ref->pic = pic; 00047 ref->w = link->w; 00048 ref->h = link->h; 00049 00050 /* make sure the buffer gets read permission or it's useless for output */ 00051 ref->perms = perms | AV_PERM_READ; 00052 00053 pic->refcount = 1; 00054 pic->format = link->format; 00055 pic->free = avfilter_default_free_video_buffer; 00056 ff_fill_linesize((AVPicture *)pic, pic->format, ref->w); 00057 00058 for (i=0; i<4;i++) 00059 ALIGN(pic->linesize[i]); 00060 00061 tempsize = ff_fill_pointer((AVPicture *)pic, NULL, pic->format, ref->h); 00062 buf = av_malloc(tempsize); 00063 ff_fill_pointer((AVPicture *)pic, buf, pic->format, ref->h); 00064 00065 memcpy(ref->data, pic->data, sizeof(pic->data)); 00066 memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize)); 00067 00068 return ref; 00069 } 00070 00071 void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref) 00072 { 00073 AVFilterLink *out = NULL; 00074 00075 if(link->dst->output_count) 00076 out = link->dst->outputs[0]; 00077 00078 if(out) { 00079 out->outpic = avfilter_get_video_buffer(out, AV_PERM_WRITE); 00080 out->outpic->pts = picref->pts; 00081 avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0)); 00082 } 00083 } 00084 00085 void avfilter_default_draw_slice(AVFilterLink *link, int y, int h) 00086 { 00087 AVFilterLink *out = NULL; 00088 00089 if(link->dst->output_count) 00090 out = link->dst->outputs[0]; 00091 00092 if(out) 00093 avfilter_draw_slice(out, y, h); 00094 } 00095 00096 void avfilter_default_end_frame(AVFilterLink *link) 00097 { 00098 AVFilterLink *out = NULL; 00099 00100 if(link->dst->output_count) 00101 out = link->dst->outputs[0]; 00102 00103 avfilter_unref_pic(link->cur_pic); 00104 link->cur_pic = NULL; 00105 00106 if(out) { 00107 if(out->outpic) { 00108 avfilter_unref_pic(out->outpic); 00109 out->outpic = NULL; 00110 } 00111 avfilter_end_frame(out); 00112 } 00113 } 00114 00118 int avfilter_default_config_output_link(AVFilterLink *link) 00119 { 00120 if(link->src->input_count && link->src->inputs[0]) { 00121 link->w = link->src->inputs[0]->w; 00122 link->h = link->src->inputs[0]->h; 00123 } else { 00124 /* XXX: any non-simple filter which would cause this branch to be taken 00125 * really should implement its own config_props() for this link. */ 00126 return -1; 00127 } 00128 00129 return 0; 00130 } 00131 00140 void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats) 00141 { 00142 int count = 0, i; 00143 00144 for(i = 0; i < ctx->input_count; i ++) { 00145 if(ctx->inputs[i]) { 00146 avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats); 00147 count ++; 00148 } 00149 } 00150 for(i = 0; i < ctx->output_count; i ++) { 00151 if(ctx->outputs[i]) { 00152 avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats); 00153 count ++; 00154 } 00155 } 00156 00157 if(!count) { 00158 av_free(formats->formats); 00159 av_free(formats->refs); 00160 av_free(formats); 00161 } 00162 } 00163 00164 int avfilter_default_query_formats(AVFilterContext *ctx) 00165 { 00166 avfilter_set_common_formats(ctx, avfilter_all_colorspaces()); 00167 return 0; 00168 } 00169