More accurate value for log2(10)
[libav.git] / 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, 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
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, out->w, out->h);
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, int slice_dir)
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, slice_dir);
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