Coding style changes
[libav.git] / libavfilter / formats.c
CommitLineData
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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
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24/** merge and update all the references */
25static void merge_ref(AVFilterFormats *ret, AVFilterFormats *a)
26{
27 int i;
93faa9fa 28
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29 for(i = 0; i < a->refcount; i ++) {
30 ret->refs[ret->refcount] = a->refs[i];
31 *ret->refs[ret->refcount++] = ret;
32 }
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33
34 av_free(a->refs);
35 av_free(a->formats);
36 av_free(a);
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37}
38
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39AVFilterFormats *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 */
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47 ret->formats = av_malloc(sizeof(*ret->formats) * FFMIN(a->format_count,
48 b->format_count));
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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
9189411b 54 ret->format_count = k;
39135465 55 /* check that there was at least one common format */
9189411b 56 if(!ret->format_count) {
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57 av_free(ret->formats);
58 av_free(ret);
59 return NULL;
60 }
61
39135465 62 ret->refs = av_malloc(sizeof(AVFilterFormats**)*(a->refcount+b->refcount));
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63
64 merge_ref(ret, a);
65 merge_ref(ret, b);
39135465 66
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67 return ret;
68}
69
70AVFilterFormats *avfilter_make_format_list(int len, ...)
71{
72 AVFilterFormats *ret;
73 int i;
74 va_list vl;
75
76 ret = av_mallocz(sizeof(AVFilterFormats));
243370cb 77 ret->formats = av_malloc(sizeof(*ret->formats) * len);
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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
88AVFilterFormats *avfilter_all_colorspaces(void)
89{
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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;
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101}
102
103void 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
30f4baeb 110static int find_ref_index(AVFilterFormats **ref)
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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
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119void avfilter_formats_unref(AVFilterFormats **ref)
120{
9189411b 121 int idx = find_ref_index(ref);
88cfb804 122
9189411b 123 if(idx >= 0)
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124 memmove((*ref)->refs + idx, (*ref)->refs + idx+1,
125 sizeof(AVFilterFormats**) * ((*ref)->refcount-idx-1));
126
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127 if(!--(*ref)->refcount) {
128 av_free((*ref)->formats);
129 av_free((*ref)->refs);
130 av_free(*ref);
131 }
132 *ref = NULL;
133}
134
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135void avfilter_formats_changeref(AVFilterFormats **oldref,
136 AVFilterFormats **newref)
137{
9189411b 138 int idx = find_ref_index(oldref);
eac24950 139
9189411b 140 if(idx >= 0) {
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141 (*oldref)->refs[idx] = newref;
142 *newref = *oldref;
143 *oldref = NULL;
144 }
145}
146