2 * Filter layer - default implementations
3 * copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavcodec/imgconvert.h"
25 /* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
26 static void avfilter_default_free_video_buffer(AVFilterPic *pic)
28 av_free(pic->data[0]);
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, int w, int h)
37 AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
38 AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
46 /* make sure the buffer gets read permission or it's useless for output */
47 ref->perms = perms | AV_PERM_READ;
50 pic->format = link->format;
51 pic->free = avfilter_default_free_video_buffer;
52 ff_fill_linesize((AVPicture *)pic, pic->format, ref->w);
55 pic->linesize[i] = FFALIGN(pic->linesize[i], 16);
57 tempsize = ff_fill_pointer((AVPicture *)pic, NULL, pic->format, ref->h);
58 buf = av_malloc(tempsize + 16); // +2 is needed for swscaler, +16 to be
60 ff_fill_pointer((AVPicture *)pic, buf, pic->format, ref->h);
62 memcpy(ref->data, pic->data, sizeof(pic->data));
63 memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
68 void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
70 AVFilterLink *out = NULL;
72 if(link->dst->output_count)
73 out = link->dst->outputs[0];
76 out->outpic = avfilter_get_video_buffer(out, AV_PERM_WRITE, out->w, out->h);
77 out->outpic->pts = picref->pts;
78 out->outpic->pos = picref->pos;
79 out->outpic->pixel_aspect = picref->pixel_aspect;
80 out->outpic->interlaced = picref->interlaced;
81 out->outpic->top_field_first = picref->top_field_first;
82 avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
86 void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
88 AVFilterLink *out = NULL;
90 if(link->dst->output_count)
91 out = link->dst->outputs[0];
94 avfilter_draw_slice(out, y, h, slice_dir);
97 void avfilter_default_end_frame(AVFilterLink *link)
99 AVFilterLink *out = NULL;
101 if(link->dst->output_count)
102 out = link->dst->outputs[0];
104 avfilter_unref_pic(link->cur_pic);
105 link->cur_pic = NULL;
109 avfilter_unref_pic(out->outpic);
112 avfilter_end_frame(out);
117 * default config_link() implementation for output video links to simplify
118 * the implementation of one input one output video filters */
119 int avfilter_default_config_output_link(AVFilterLink *link)
121 if(link->src->input_count && link->src->inputs[0]) {
122 link->w = link->src->inputs[0]->w;
123 link->h = link->src->inputs[0]->h;
125 /* XXX: any non-simple filter which would cause this branch to be taken
126 * really should implement its own config_props() for this link. */
134 * A helper for query_formats() which sets all links to the same list of
135 * formats. If there are no links hooked to this filter, the list of formats is
138 * FIXME: this will need changed for filters with a mix of pad types
139 * (video + audio, etc)
141 void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
145 for(i = 0; i < ctx->input_count; i ++) {
147 avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
151 for(i = 0; i < ctx->output_count; i ++) {
152 if(ctx->outputs[i]) {
153 avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
159 av_free(formats->formats);
160 av_free(formats->refs);
165 int avfilter_default_query_formats(AVFilterContext *ctx)
167 avfilter_set_common_formats(ctx, avfilter_all_colorspaces());
171 void avfilter_null_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
173 avfilter_start_frame(link->dst->outputs[0], picref);
176 void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
178 avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
181 void avfilter_null_end_frame(AVFilterLink *link)
183 avfilter_end_frame(link->dst->outputs[0]);
186 AVFilterPicRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
188 return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);