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() */ 26static 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. */ 35AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h) 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 = pic->w = w; 44 ref->h = pic->h = 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 67void 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, out->w, out->h); 76 out->outpic->pts = picref->pts; 77 out->outpic->pos = picref->pos; 78 out->outpic->pixel_aspect = picref->pixel_aspect; 79 avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0)); 80 } 81} 82 83void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) 84{ 85 AVFilterLink *out = NULL; 86 87 if(link->dst->output_count) 88 out = link->dst->outputs[0]; 89 90 if(out) 91 avfilter_draw_slice(out, y, h, slice_dir); 92} 93 94void avfilter_default_end_frame(AVFilterLink *link) 95{ 96 AVFilterLink *out = NULL; 97 98 if(link->dst->output_count) 99 out = link->dst->outputs[0]; 100 101 avfilter_unref_pic(link->cur_pic); 102 link->cur_pic = NULL; 103 104 if(out) { 105 if(out->outpic) { 106 avfilter_unref_pic(out->outpic); 107 out->outpic = NULL; 108 } 109 avfilter_end_frame(out); 110 } 111} 112 113/** 114 * default config_link() implementation for output video links to simplify 115 * the implementation of one input one output video filters */ 116int avfilter_default_config_output_link(AVFilterLink *link) 117{ 118 if(link->src->input_count && link->src->inputs[0]) { 119 link->w = link->src->inputs[0]->w; 120 link->h = link->src->inputs[0]->h; 121 } else { 122 /* XXX: any non-simple filter which would cause this branch to be taken 123 * really should implement its own config_props() for this link. */ 124 return -1; 125 } 126 127 return 0; 128} 129 130/** 131 * A helper for query_formats() which sets all links to the same list of 132 * formats. If there are no links hooked to this filter, the list of formats is 133 * freed. 134 * 135 * FIXME: this will need changed for filters with a mix of pad types 136 * (video + audio, etc) 137 */ 138void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats) 139{ 140 int count = 0, i; 141 142 for(i = 0; i < ctx->input_count; i ++) { 143 if(ctx->inputs[i]) { 144 avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats); 145 count ++; 146 } 147 } 148 for(i = 0; i < ctx->output_count; i ++) { 149 if(ctx->outputs[i]) { 150 avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats); 151 count ++; 152 } 153 } 154 155 if(!count) { 156 av_free(formats->formats); 157 av_free(formats->refs); 158 av_free(formats); 159 } 160} 161 162int avfilter_default_query_formats(AVFilterContext *ctx) 163{ 164 avfilter_set_common_formats(ctx, avfilter_all_colorspaces()); 165 return 0; 166} 167 168void avfilter_null_start_frame(AVFilterLink *link, AVFilterPicRef *picref) 169{ 170 avfilter_start_frame(link->dst->outputs[0], picref); 171} 172 173void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) 174{ 175 avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir); 176} 177 178void avfilter_null_end_frame(AVFilterLink *link) 179{ 180 avfilter_end_frame(link->dst->outputs[0]); 181} 182 183AVFilterPicRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h) 184{ 185 return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h); 186} 187 188