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
23 #include "libavutil/intreadwrite.h"
26 #define ENABLE_DEBUG 0
28 #define APE_TAG_VERSION 2000
29 #define APE_TAG_FOOTER_BYTES 32
30 #define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31)
31 #define APE_TAG_FLAG_IS_HEADER (1 << 29)
33 static int ape_tag_read_field(AVFormatContext *s)
35 ByteIOContext *pb = s->pb;
36 uint8_t key[1024], value[1024];
40 size = get_le32(pb); /* field size */
41 flags = get_le32(pb); /* field flags */
42 for (i = 0; i < sizeof(key) - 1; i++) {
44 if (c < 0x20 || c > 0x7E)
51 av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key);
54 l = FFMIN(size, sizeof(value)-1);
55 get_buffer(pb, value, l);
57 url_fskip(pb, size-l);
59 av_log(s, AV_LOG_WARNING, "Too long '%s' tag was truncated.\n", key);
60 av_metadata_set(&s->metadata, key, value);
64 void ff_ape_parse_tag(AVFormatContext *s)
66 ByteIOContext *pb = s->pb;
67 int file_size = url_fsize(pb);
68 uint32_t val, fields, tag_bytes;
72 if (file_size < APE_TAG_FOOTER_BYTES)
75 url_fseek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
77 get_buffer(pb, buf, 8); /* APETAGEX */
78 if (strncmp(buf, "APETAGEX", 8)) {
82 val = get_le32(pb); /* APE tag version */
83 if (val > APE_TAG_VERSION) {
84 av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
88 tag_bytes = get_le32(pb); /* tag size */
89 if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
90 av_log(s, AV_LOG_ERROR, "Tag size is way too big\n");
94 fields = get_le32(pb); /* number of fields */
96 av_log(s, AV_LOG_ERROR, "Too many tag fields (%d)\n", fields);
100 val = get_le32(pb); /* flags */
101 if (val & APE_TAG_FLAG_IS_HEADER) {
102 av_log(s, AV_LOG_ERROR, "APE Tag is a header\n");
106 url_fseek(pb, file_size - tag_bytes, SEEK_SET);
108 for (i=0; i<fields; i++)
109 if (ape_tag_read_field(s) < 0) break;