1 /*******************************************************************************
2 avi_ix.c
3
4 libquicktime - A library for reading and writing quicktime/avi/mp4 files.
5 http://libquicktime.sourceforge.net
6
7 Copyright (C) 2002 Heroine Virtual Ltd.
8 Copyright (C) 2002-2011 Members of the libquicktime project.
9
10 This library is free software; you can redistribute it and/or modify it under
11 the terms of the GNU Lesser General Public License as published by the Free
12 Software Foundation; either version 2.1 of the License, or (at your option)
13 any later version.
14
15 This library is distributed in the hope that it will be useful, but WITHOUT
16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
18 details.
19
20 You should have received a copy of the GNU Lesser General Public License along
21 with this library; if not, write to the Free Software Foundation, Inc., 51
22 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 *******************************************************************************/
24
25 #include "lqt_private.h"
26 #include <stdlib.h>
27 #include <string.h>
28
make_tag(int number,char * tag)29 static char* make_tag(int number, char *tag)
30 {
31 tag[0] = 'i';
32 tag[1] = 'x';
33 tag[2] = '0' + (number / 10);
34 tag[3] = '0' + (number % 10);
35 return tag;
36 }
37
quicktime_new_ix(quicktime_t * file,quicktime_trak_t * trak,quicktime_strl_t * strl)38 quicktime_ix_t* quicktime_new_ix(quicktime_t *file,
39 quicktime_trak_t *trak,
40 quicktime_strl_t *strl)
41 {
42 quicktime_ix_t *ix = calloc(1, sizeof(quicktime_ix_t));
43 ix->base_offset = quicktime_position(file);
44 make_tag(trak->tkhd.track_id - 1, ix->tag);
45 ix->longs_per_entry = 2;
46 ix->index_type = AVI_INDEX_OF_CHUNKS;
47 memcpy(ix->chunk_id, strl->tag, 4);
48 return ix;
49 }
50
51
quicktime_delete_ix(quicktime_ix_t * ix)52 void quicktime_delete_ix(quicktime_ix_t *ix)
53 {
54 if(ix->table) free(ix->table);
55 free(ix);
56 }
57
quicktime_update_ixtable(quicktime_t * file,quicktime_trak_t * trak,int64_t offset,int size)58 void quicktime_update_ixtable(quicktime_t *file,
59 quicktime_trak_t *trak,
60 int64_t offset,
61 int size)
62 {
63 quicktime_indx_t *indx = &trak->strl->indx;
64
65 quicktime_ix_t *ix = indx->table[indx->table_size-1].ix;
66 quicktime_ixtable_t *ix_table;
67
68
69 /* Allocation */
70 if(ix->table_size >= ix->table_allocation)
71 {
72 int new_allocation = ix->table_allocation * 2;
73 if(new_allocation < 1) new_allocation = 1;
74 ix->table = realloc(ix->table, sizeof(quicktime_ixtable_t) * new_allocation);
75 memset(ix->table + ix->table_size, 0,
76 sizeof(quicktime_ixtable_t)*(new_allocation - ix->table_size));
77 ix->table_allocation = new_allocation;
78 }
79
80 /* Appendage */
81 ix_table = &ix->table[ix->table_size++];
82 ix_table->relative_offset = offset - ix->base_offset;
83 ix_table->size = size;
84
85 if(!trak->mdia.minf.is_audio &&
86 trak->mdia.minf.stbl.stss.total_entries)
87 {
88 /* If bit 31 of the size is set, we have *no* keyframe */
89 ix_table->size |= 0x80000000;
90 }
91 }
92
93
quicktime_write_ix(quicktime_t * file,quicktime_trak_t * trak)94 void quicktime_write_ix(quicktime_t *file,
95 quicktime_trak_t * trak)
96 {
97 int i;
98 quicktime_strl_t *strl;
99 quicktime_indx_t *indx;
100 quicktime_ix_t *ix;
101
102 strl = trak->strl;
103 indx = &strl->indx;
104 ix = indx->table[indx->table_size-1].ix;
105
106 quicktime_atom_write_header(file, &ix->atom, ix->tag);
107
108 /* longs per entry */
109 quicktime_write_int16_le(file, ix->longs_per_entry);
110 /* index sub type */
111 quicktime_write_char(file, 0);
112 /* index type */
113 quicktime_write_char(file, ix->index_type);
114 /* entries in use */
115 quicktime_write_int32_le(file, ix->table_size);
116 /* chunk ID */
117 quicktime_write_char32(file, ix->chunk_id);
118 /* base offset */
119 quicktime_write_int64_le(file, ix->base_offset);
120 /* reserved */
121 quicktime_write_int32_le(file, 0);
122
123 /* table */
124 for(i = 0; i < ix->table_size; i++)
125 {
126 quicktime_ixtable_t *table = &ix->table[i];
127 quicktime_write_int32_le(file, table->relative_offset);
128 quicktime_write_int32_le(file, table->size);
129 }
130
131 quicktime_atom_write_footer(file, &ix->atom);
132
133
134 }
135
quicktime_read_ix(quicktime_t * file,quicktime_ix_t * ix)136 void quicktime_read_ix(quicktime_t *file,
137 quicktime_ix_t *ix)
138 {
139 int i;
140 quicktime_atom_t leaf_atom;
141 quicktime_atom_read_header(file, &leaf_atom);
142
143 ix->longs_per_entry = quicktime_read_int16_le(file);
144 /* sub type */
145 quicktime_read_char(file);
146 ix->index_type = quicktime_read_char(file);
147 ix->table_size = quicktime_read_int32_le(file);
148 quicktime_read_char32(file, ix->chunk_id);
149 ix->base_offset = quicktime_read_int64_le(file);
150 /* reserved */
151 quicktime_read_int32_le(file);
152
153 ix->table = calloc(ix->table_size, sizeof(quicktime_ixtable_t));
154
155 for(i = 0; i < ix->table_size; i++)
156 {
157 quicktime_ixtable_t *ixtable = &ix->table[i];
158 ixtable->relative_offset = quicktime_read_int32_le(file);
159 ixtable->size = quicktime_read_int32_le(file);
160 }
161 }
162
quicktime_ix_dump(quicktime_ix_t * ix)163 void quicktime_ix_dump(quicktime_ix_t *ix)
164 {
165 int i;
166 lqt_dump(" table_size: %d\n", ix->table_size);
167 lqt_dump(" longs_per_entry: %d\n", ix->longs_per_entry);
168 lqt_dump(" index_type: %d\n", ix->index_type);
169 lqt_dump(" base_offset: %"PRId64"\n", ix->base_offset);
170 lqt_dump(" tag: %s\n", ix->tag);
171 lqt_dump(" chunk_id: %s\n", ix->chunk_id);
172 for(i = 0; i < ix->table_size; i++)
173 {
174 lqt_dump(" off: %d, size: %d, k: %d\n", ix->table[i].relative_offset,
175 (ix->table[i].size & 0x7FFFFFFF),
176 !(ix->table[i].size & 0x80000000));
177 }
178 }
179