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/** 25 * Add all refs from a to ret and destroy a. 26 */ 27static void merge_ref(AVFilterFormats *ret, AVFilterFormats *a) 28{ 29 int i; 30 31 for(i = 0; i < a->refcount; i ++) { 32 ret->refs[ret->refcount] = a->refs[i]; 33 *ret->refs[ret->refcount++] = ret; 34 } 35 36 av_free(a->refs); 37 av_free(a->formats); 38 av_free(a); 39} 40 41AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b) 42{ 43 AVFilterFormats *ret; 44 unsigned i, j, k = 0; 45 46 ret = av_mallocz(sizeof(AVFilterFormats)); 47 48 /* merge list of formats */ 49 ret->formats = av_malloc(sizeof(*ret->formats) * FFMIN(a->format_count, 50 b->format_count)); 51 for(i = 0; i < a->format_count; i ++) 52 for(j = 0; j < b->format_count; j ++) 53 if(a->formats[i] == b->formats[j]) 54 ret->formats[k++] = a->formats[i]; 55 56 ret->format_count = k; 57 /* check that there was at least one common format */ 58 if(!ret->format_count) { 59 av_free(ret->formats); 60 av_free(ret); 61 return NULL; 62 } 63 64 ret->refs = av_malloc(sizeof(AVFilterFormats**)*(a->refcount+b->refcount)); 65 66 merge_ref(ret, a); 67 merge_ref(ret, b); 68 69 return ret; 70} 71 72AVFilterFormats *avfilter_make_format_list(int len, ...) 73{ 74 AVFilterFormats *ret; 75 int i; 76 va_list vl; 77 78 ret = av_mallocz(sizeof(AVFilterFormats)); 79 ret->formats = av_malloc(sizeof(*ret->formats) * len); 80 ret->format_count = len; 81 82 va_start(vl, len); 83 for(i = 0; i < len; i ++) 84 ret->formats[i] = va_arg(vl, int); 85 va_end(vl); 86 87 return ret; 88} 89 90AVFilterFormats *avfilter_all_colorspaces(void) 91{ 92 AVFilterFormats *ret; 93 int i; 94 95 ret = av_mallocz(sizeof(AVFilterFormats)); 96 ret->formats = av_malloc(sizeof(*ret->formats) * PIX_FMT_NB); 97 ret->format_count = PIX_FMT_NB; 98 99 for(i = 0; i < PIX_FMT_NB; i ++) 100 ret->formats[i] = i; 101 102 return ret; 103} 104 105void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref) 106{ 107 *ref = f; 108 f->refs = av_realloc(f->refs, sizeof(AVFilterFormats**) * ++f->refcount); 109 f->refs[f->refcount-1] = ref; 110} 111 112static int find_ref_index(AVFilterFormats **ref) 113{ 114 int i; 115 for(i = 0; i < (*ref)->refcount; i ++) 116 if((*ref)->refs[i] == ref) 117 return i; 118 return -1; 119} 120 121void avfilter_formats_unref(AVFilterFormats **ref) 122{ 123 int idx = find_ref_index(ref); 124 125 if(idx >= 0) 126 memmove((*ref)->refs + idx, (*ref)->refs + idx+1, 127 sizeof(AVFilterFormats**) * ((*ref)->refcount-idx-1)); 128 129 if(!--(*ref)->refcount) { 130 av_free((*ref)->formats); 131 av_free((*ref)->refs); 132 av_free(*ref); 133 } 134 *ref = NULL; 135} 136 137void avfilter_formats_changeref(AVFilterFormats **oldref, 138 AVFilterFormats **newref) 139{ 140 int idx = find_ref_index(oldref); 141 142 if(idx >= 0) { 143 (*oldref)->refs[idx] = newref; 144 *newref = *oldref; 145 *oldref = NULL; 146 } 147} 148 149