3 * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
4 * based upon libdemac from Dave Chapman.
6 * This file is part of FFmpeg.
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.
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.
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
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/dict.h"
28 #include "avio_internal.h"
32 #define APE_TAG_FLAG_CONTAINS_HEADER (1U << 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)
37 static int ape_tag_read_field(AVFormatContext *s)
39 AVIOContext *pb = s->pb;
40 uint8_t key[1024], *value;
44 size = avio_rl32(pb); /* field size */
45 flags = avio_rl32(pb); /* field flags */
46 for (i = 0; i < sizeof(key) - 1; i++) {
48 if (c < 0x20 || c > 0x7E)
55 av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key);
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;
62 if (flags & APE_TAG_FLAG_IS_BINARY) {
63 uint8_t filename[1024];
66 AVStream *st = avformat_new_stream(s, NULL);
68 return AVERROR(ENOMEM);
70 ret = avio_get_str(pb, size, filename, sizeof(filename));
74 av_log(s, AV_LOG_WARNING, "Skipping binary tag '%s'.\n", key);
79 av_dict_set(&st->metadata, key, filename, 0);
81 if ((id = ff_guess_image2_codec(filename)) != AV_CODEC_ID_NONE) {
82 int ret = ff_add_attached_pic(s, st, s->pb, NULL, size);
84 av_log(s, AV_LOG_ERROR, "Error reading cover art.\n");
87 st->codecpar->codec_id = id;
89 if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0)
91 st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
94 value = av_malloc(size+1);
96 return AVERROR(ENOMEM);
97 c = avio_read(pb, value, size);
103 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
108 int64_t ff_ape_parse_tag(AVFormatContext *s)
110 AVIOContext *pb = s->pb;
111 int64_t file_size = avio_size(pb);
112 uint32_t val, fields, tag_bytes;
117 if (file_size < APE_TAG_FOOTER_BYTES)
120 avio_seek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
122 avio_read(pb, buf, 8); /* APETAGEX */
123 if (strncmp(buf, APE_TAG_PREAMBLE, 8)) {
127 val = avio_rl32(pb); /* APE tag version */
128 if (val > APE_TAG_VERSION) {
129 av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
133 tag_bytes = avio_rl32(pb); /* tag size */
134 if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
135 av_log(s, AV_LOG_ERROR, "Tag size is way too big\n");
139 if (tag_bytes > file_size - APE_TAG_FOOTER_BYTES) {
140 av_log(s, AV_LOG_ERROR, "Invalid tag size %"PRIu32".\n", tag_bytes);
144 fields = avio_rl32(pb); /* number of fields */
145 if (fields > 65536) {
146 av_log(s, AV_LOG_ERROR, "Too many tag fields (%"PRIu32")\n", fields);
150 val = avio_rl32(pb); /* flags */
151 if (val & APE_TAG_FLAG_IS_HEADER) {
152 av_log(s, AV_LOG_ERROR, "APE Tag is a header\n");
156 avio_seek(pb, file_size - tag_bytes, SEEK_SET);
158 if (val & APE_TAG_FLAG_CONTAINS_HEADER)
159 tag_bytes += APE_TAG_HEADER_BYTES;
161 tag_start = file_size - tag_bytes;
163 for (i=0; i<fields; i++)
164 if (ape_tag_read_field(s) < 0) break;
169 static int string_is_ascii(const uint8_t *str)
171 while (*str && *str >= 0x20 && *str <= 0x7e ) str++;
175 int ff_ape_write_tag(AVFormatContext *s)
177 AVDictionaryEntry *e = NULL;
178 int size, ret, count = 0;
182 if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
185 ff_standardize_creation_time(s);
186 while ((e = av_dict_get(s->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
189 if (!string_is_ascii(e->key)) {
190 av_log(s, AV_LOG_WARNING, "Non ASCII keys are not allowed\n");
194 val_len = strlen(e->value);
195 avio_wl32(dyn_bc, val_len); // value length
196 avio_wl32(dyn_bc, 0); // item flags
197 avio_put_str(dyn_bc, e->key); // key
198 avio_write(dyn_bc, e->value, val_len); // value
204 size = avio_get_dyn_buf(dyn_bc, &dyn_buf);
207 size += APE_TAG_FOOTER_BYTES;
210 avio_write(s->pb, "APETAGEX", 8); // id
211 avio_wl32(s->pb, APE_TAG_VERSION); // version
212 avio_wl32(s->pb, size);
213 avio_wl32(s->pb, count);
216 avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_IS_HEADER);
217 ffio_fill(s->pb, 0, 8); // reserved
219 avio_write(s->pb, dyn_buf, size - APE_TAG_FOOTER_BYTES);
222 avio_write(s->pb, "APETAGEX", 8); // id
223 avio_wl32(s->pb, APE_TAG_VERSION); // version
224 avio_wl32(s->pb, size); // size
225 avio_wl32(s->pb, count); // tag count
228 avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER);
229 ffio_fill(s->pb, 0, 8); // reserved
232 ffio_free_dyn_buf(&dyn_bc);