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path: root/libavformat/apetag.c (plain)
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1/*
2 * APE tag handling
3 * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
4 * based upon libdemac from Dave Chapman.
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include <inttypes.h>
24
25#include "libavutil/intreadwrite.h"
26#include "libavutil/dict.h"
27#include "avformat.h"
28#include "avio_internal.h"
29#include "apetag.h"
30#include "internal.h"
31
32#define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31)
33#define APE_TAG_FLAG_LACKS_FOOTER (1 << 30)
34#define APE_TAG_FLAG_IS_HEADER (1 << 29)
35#define APE_TAG_FLAG_IS_BINARY (1 << 1)
36
37static int ape_tag_read_field(AVFormatContext *s)
38{
39 AVIOContext *pb = s->pb;
40 uint8_t key[1024], *value;
41 int64_t size, flags;
42 int i, c;
43
44 size = avio_rl32(pb); /* field size */
45 flags = avio_rl32(pb); /* field flags */
46 for (i = 0; i < sizeof(key) - 1; i++) {
47 c = avio_r8(pb);
48 if (c < 0x20 || c > 0x7E)
49 break;
50 else
51 key[i] = c;
52 }
53 key[i] = 0;
54 if (c != 0) {
55 av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key);
56 return -1;
57 }
58 if (size > INT32_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
59 av_log(s, AV_LOG_ERROR, "APE tag size too large.\n");
60 return AVERROR_INVALIDDATA;
61 }
62 if (flags & APE_TAG_FLAG_IS_BINARY) {
63 uint8_t filename[1024];
64 enum AVCodecID id;
65 int ret;
66 AVStream *st = avformat_new_stream(s, NULL);
67 if (!st)
68 return AVERROR(ENOMEM);
69
70 ret = avio_get_str(pb, size, filename, sizeof(filename));
71 if (ret < 0)
72 return ret;
73 if (size <= ret) {
74 av_log(s, AV_LOG_WARNING, "Skipping binary tag '%s'.\n", key);
75 return 0;
76 }
77 size -= ret;
78
79 av_dict_set(&st->metadata, key, filename, 0);
80
81 if ((id = ff_guess_image2_codec(filename)) != AV_CODEC_ID_NONE) {
82 AVPacket pkt;
83 int ret;
84
85 ret = av_get_packet(s->pb, &pkt, size);
86 if (ret < 0) {
87 av_log(s, AV_LOG_ERROR, "Error reading cover art.\n");
88 return ret;
89 }
90
91 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
92 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
93 st->codecpar->codec_id = id;
94
95 st->attached_pic = pkt;
96 st->attached_pic.stream_index = st->index;
97 st->attached_pic.flags |= AV_PKT_FLAG_KEY;
98 } else {
99 if (ff_get_extradata(s, st->codecpar, s->pb, size) < 0)
100 return AVERROR(ENOMEM);
101 st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
102 }
103 } else {
104 value = av_malloc(size+1);
105 if (!value)
106 return AVERROR(ENOMEM);
107 c = avio_read(pb, value, size);
108 if (c < 0) {
109 av_free(value);
110 return c;
111 }
112 value[c] = 0;
113 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
114 }
115 return 0;
116}
117
118int64_t ff_ape_parse_tag(AVFormatContext *s)
119{
120 AVIOContext *pb = s->pb;
121 int64_t file_size = avio_size(pb);
122 uint32_t val, fields, tag_bytes;
123 uint8_t buf[8];
124 int64_t tag_start;
125 int i;
126
127 if (file_size < APE_TAG_FOOTER_BYTES)
128 return 0;
129
130 avio_seek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
131
132 avio_read(pb, buf, 8); /* APETAGEX */
133 if (strncmp(buf, APE_TAG_PREAMBLE, 8)) {
134 return 0;
135 }
136
137 val = avio_rl32(pb); /* APE tag version */
138 if (val > APE_TAG_VERSION) {
139 av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
140 return 0;
141 }
142
143 tag_bytes = avio_rl32(pb); /* tag size */
144 if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
145 av_log(s, AV_LOG_ERROR, "Tag size is way too big\n");
146 return 0;
147 }
148
149 if (tag_bytes > file_size - APE_TAG_FOOTER_BYTES) {
150 av_log(s, AV_LOG_ERROR, "Invalid tag size %"PRIu32".\n", tag_bytes);
151 return 0;
152 }
153
154 fields = avio_rl32(pb); /* number of fields */
155 if (fields > 65536) {
156 av_log(s, AV_LOG_ERROR, "Too many tag fields (%"PRIu32")\n", fields);
157 return 0;
158 }
159
160 val = avio_rl32(pb); /* flags */
161 if (val & APE_TAG_FLAG_IS_HEADER) {
162 av_log(s, AV_LOG_ERROR, "APE Tag is a header\n");
163 return 0;
164 }
165
166 avio_seek(pb, file_size - tag_bytes, SEEK_SET);
167
168 if (val & APE_TAG_FLAG_CONTAINS_HEADER)
169 tag_bytes += APE_TAG_HEADER_BYTES;
170
171 tag_start = file_size - tag_bytes;
172
173 for (i=0; i<fields; i++)
174 if (ape_tag_read_field(s) < 0) break;
175
176 return tag_start;
177}
178
179static int string_is_ascii(const uint8_t *str)
180{
181 while (*str && *str >= 0x20 && *str <= 0x7e ) str++;
182 return !*str;
183}
184
185int ff_ape_write_tag(AVFormatContext *s)
186{
187 AVDictionaryEntry *e = NULL;
188 int size, ret, count = 0;
189 AVIOContext *dyn_bc = NULL;
190 uint8_t *dyn_buf = NULL;
191
192 if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
193 goto end;
194
195 ff_standardize_creation_time(s);
196 while ((e = av_dict_get(s->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
197 int val_len;
198
199 if (!string_is_ascii(e->key)) {
200 av_log(s, AV_LOG_WARNING, "Non ASCII keys are not allowed\n");
201 continue;
202 }
203
204 val_len = strlen(e->value);
205 avio_wl32(dyn_bc, val_len); // value length
206 avio_wl32(dyn_bc, 0); // item flags
207 avio_put_str(dyn_bc, e->key); // key
208 avio_write(dyn_bc, e->value, val_len); // value
209 count++;
210 }
211 if (!count)
212 goto end;
213
214 size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
215 if (size <= 0)
216 goto end;
217 size += APE_TAG_FOOTER_BYTES;
218
219 // header
220 avio_write(s->pb, "APETAGEX", 8); // id
221 avio_wl32(s->pb, APE_TAG_VERSION); // version
222 avio_wl32(s->pb, size);
223 avio_wl32(s->pb, count);
224
225 // flags
226 avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_IS_HEADER);
227 ffio_fill(s->pb, 0, 8); // reserved
228
229 avio_write(s->pb, dyn_buf, size - APE_TAG_FOOTER_BYTES);
230
231 // footer
232 avio_write(s->pb, "APETAGEX", 8); // id
233 avio_wl32(s->pb, APE_TAG_VERSION); // version
234 avio_wl32(s->pb, size); // size
235 avio_wl32(s->pb, count); // tag count
236
237 // flags
238 avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER);
239 ffio_fill(s->pb, 0, 8); // reserved
240
241end:
242 if (dyn_bc && !dyn_buf)
243 avio_close_dyn_buf(dyn_bc, &dyn_buf);
244 av_freep(&dyn_buf);
245
246 return ret;
247}
248
generated by cgit at 2024-05-17 05:01:45 (GMT)