Coding style changes
[libav.git] / libavfilter / formats.c
1 /*
2 * Filter layer - format negotiation
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 "avfilter.h"
23
24 /** merge and update all the references */
25 static void merge_ref(AVFilterFormats *ret, AVFilterFormats *a)
26 {
27 int i;
28
29 for(i = 0; i < a->refcount; i ++) {
30 ret->refs[ret->refcount] = a->refs[i];
31 *ret->refs[ret->refcount++] = ret;
32 }
33
34 av_free(a->refs);
35 av_free(a->formats);
36 av_free(a);
37 }
38
39 AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
40 {
41 AVFilterFormats *ret;
42 unsigned i, j, k = 0;
43
44 ret = av_mallocz(sizeof(AVFilterFormats));
45
46 /* merge list of formats */
47 ret->formats = av_malloc(sizeof(*ret->formats) * FFMIN(a->format_count,
48 b->format_count));
49 for(i = 0; i < a->format_count; i ++)
50 for(j = 0; j < b->format_count; j ++)
51 if(a->formats[i] == b->formats[j])
52 ret->formats[k++] = a->formats[i];
53
54 ret->format_count = k;
55 /* check that there was at least one common format */
56 if(!ret->format_count) {
57 av_free(ret->formats);
58 av_free(ret);
59 return NULL;
60 }
61
62 ret->refs = av_malloc(sizeof(AVFilterFormats**)*(a->refcount+b->refcount));
63
64 merge_ref(ret, a);
65 merge_ref(ret, b);
66
67 return ret;
68 }
69
70 AVFilterFormats *avfilter_make_format_list(int len, ...)
71 {
72 AVFilterFormats *ret;
73 int i;
74 va_list vl;
75
76 ret = av_mallocz(sizeof(AVFilterFormats));
77 ret->formats = av_malloc(sizeof(*ret->formats) * len);
78 ret->format_count = len;
79
80 va_start(vl, len);
81 for(i = 0; i < len; i ++)
82 ret->formats[i] = va_arg(vl, int);
83 va_end(vl);
84
85 return ret;
86 }
87
88 AVFilterFormats *avfilter_all_colorspaces(void)
89 {
90 AVFilterFormats *ret;
91 int i;
92
93 ret = av_mallocz(sizeof(AVFilterFormats));
94 ret->formats = av_malloc(sizeof(*ret->formats) * PIX_FMT_NB);
95 ret->format_count = PIX_FMT_NB;
96
97 for(i = 0; i < PIX_FMT_NB; i ++)
98 ret->formats[i] = i;
99
100 return ret;
101 }
102
103 void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
104 {
105 *ref = f;
106 f->refs = av_realloc(f->refs, sizeof(AVFilterFormats**) * ++f->refcount);
107 f->refs[f->refcount-1] = ref;
108 }
109
110 static int find_ref_index(AVFilterFormats **ref)
111 {
112 int i;
113 for(i = 0; i < (*ref)->refcount; i ++)
114 if((*ref)->refs[i] == ref)
115 return i;
116 return -1;
117 }
118
119 void avfilter_formats_unref(AVFilterFormats **ref)
120 {
121 int idx = find_ref_index(ref);
122
123 if(idx >= 0)
124 memmove((*ref)->refs + idx, (*ref)->refs + idx+1,
125 sizeof(AVFilterFormats**) * ((*ref)->refcount-idx-1));
126
127 if(!--(*ref)->refcount) {
128 av_free((*ref)->formats);
129 av_free((*ref)->refs);
130 av_free(*ref);
131 }
132 *ref = NULL;
133 }
134
135 void avfilter_formats_changeref(AVFilterFormats **oldref,
136 AVFilterFormats **newref)
137 {
138 int idx = find_ref_index(oldref);
139
140 if(idx >= 0) {
141 (*oldref)->refs[idx] = newref;
142 *newref = *oldref;
143 *oldref = NULL;
144 }
145 }
146