2009-01-15 12:23:03 +00:00
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/*
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* ID3v2 header parser
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "id3v2.h"
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2009-06-11 15:26:57 +00:00
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#include "id3v1.h"
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#include "libavutil/avstring.h"
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2009-01-15 12:23:03 +00:00
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int ff_id3v2_match(const uint8_t *buf)
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{
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2009-06-11 15:35:23 +00:00
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return buf[0] == 'I' &&
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buf[1] == 'D' &&
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buf[2] == '3' &&
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buf[3] != 0xff &&
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buf[4] != 0xff &&
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(buf[6] & 0x80) == 0 &&
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(buf[7] & 0x80) == 0 &&
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(buf[8] & 0x80) == 0 &&
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2009-06-11 20:45:35 +00:00
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(buf[9] & 0x80) == 0;
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2009-01-15 12:23:03 +00:00
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}
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2009-01-19 21:54:06 +00:00
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int ff_id3v2_tag_len(const uint8_t * buf)
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{
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int len = ((buf[6] & 0x7f) << 21) +
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2009-06-11 15:35:23 +00:00
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((buf[7] & 0x7f) << 14) +
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((buf[8] & 0x7f) << 7) +
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(buf[9] & 0x7f) +
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ID3v2_HEADER_SIZE;
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2009-01-19 21:54:06 +00:00
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if (buf[5] & 0x10)
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len += ID3v2_HEADER_SIZE;
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return len;
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}
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2009-06-11 15:26:57 +00:00
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static unsigned int get_size(ByteIOContext *s, int len)
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{
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2009-06-11 15:35:23 +00:00
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int v = 0;
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while (len--)
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v = (v << 7) + (get_byte(s) & 0x7F);
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2009-06-11 15:26:57 +00:00
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return v;
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}
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static void read_ttag(AVFormatContext *s, int taglen, const char *key)
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{
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char *q, dst[512];
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int len, dstlen = sizeof(dst) - 1;
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unsigned genre;
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2009-06-11 15:35:23 +00:00
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dst[0] = 0;
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if (taglen < 1)
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2009-06-11 15:26:57 +00:00
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return;
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taglen--; /* account for encoding type byte */
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2009-06-11 15:35:23 +00:00
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switch (get_byte(s->pb)) { /* encoding type */
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2009-06-11 15:26:57 +00:00
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case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
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q = dst;
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2009-06-11 15:35:23 +00:00
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while (taglen--) {
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2009-06-11 15:26:57 +00:00
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uint8_t tmp;
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PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
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}
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*q = '\0';
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break;
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case 3: /* UTF-8 */
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2009-06-11 15:35:23 +00:00
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len = FFMIN(taglen, dstlen - 1);
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2009-06-11 15:26:57 +00:00
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get_buffer(s->pb, dst, len);
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dst[len] = 0;
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break;
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}
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if (!strcmp(key, "genre")
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&& (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1)
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&& genre <= ID3v1_GENRE_MAX)
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av_strlcpy(dst, ff_id3v1_genre_str[genre], sizeof(dst));
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if (*dst)
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av_metadata_set(&s->metadata, key, dst);
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}
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void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
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{
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int isv34, tlen;
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uint32_t tag;
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int64_t next;
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int taghdrlen;
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const char *reason;
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2009-06-11 15:35:23 +00:00
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switch (version) {
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2009-06-11 15:26:57 +00:00
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case 2:
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2009-06-11 15:35:23 +00:00
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if (flags & 0x40) {
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2009-06-11 15:26:57 +00:00
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reason = "compression";
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goto error;
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}
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isv34 = 0;
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taghdrlen = 6;
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break;
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case 3:
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case 4:
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isv34 = 1;
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taghdrlen = 10;
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break;
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default:
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reason = "version";
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goto error;
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}
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2009-06-11 15:35:23 +00:00
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if (flags & 0x80) {
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2009-06-11 15:26:57 +00:00
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reason = "unsynchronization";
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goto error;
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}
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2009-06-11 15:35:23 +00:00
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if (isv34 && flags & 0x40) /* Extended header present, just skip over it */
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2009-06-11 15:26:57 +00:00
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url_fskip(s->pb, get_size(s->pb, 4));
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2009-06-11 15:35:23 +00:00
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while (len >= taghdrlen) {
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if (isv34) {
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2009-06-11 15:26:57 +00:00
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tag = get_be32(s->pb);
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tlen = get_size(s->pb, 4);
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get_be16(s->pb); /* flags */
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} else {
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tag = get_be24(s->pb);
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tlen = get_size(s->pb, 3);
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}
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len -= taghdrlen + tlen;
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2009-06-11 15:35:23 +00:00
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if (len < 0)
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2009-06-11 15:26:57 +00:00
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break;
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next = url_ftell(s->pb) + tlen;
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2009-06-11 15:35:23 +00:00
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switch (tag) {
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2009-06-11 15:26:57 +00:00
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case MKBETAG('T', 'I', 'T', '2'):
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case MKBETAG(0, 'T', 'T', '2'):
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read_ttag(s, tlen, "title");
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break;
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case MKBETAG('T', 'P', 'E', '1'):
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case MKBETAG(0, 'T', 'P', '1'):
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read_ttag(s, tlen, "author");
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break;
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case MKBETAG('T', 'A', 'L', 'B'):
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case MKBETAG(0, 'T', 'A', 'L'):
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read_ttag(s, tlen, "album");
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break;
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case MKBETAG('T', 'C', 'O', 'N'):
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case MKBETAG(0, 'T', 'C', 'O'):
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read_ttag(s, tlen, "genre");
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break;
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case MKBETAG('T', 'C', 'O', 'P'):
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case MKBETAG(0, 'T', 'C', 'R'):
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read_ttag(s, tlen, "copyright");
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break;
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case MKBETAG('T', 'R', 'C', 'K'):
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case MKBETAG(0, 'T', 'R', 'K'):
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read_ttag(s, tlen, "track");
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break;
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case 0:
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/* padding, skip to end */
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url_fskip(s->pb, len);
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len = 0;
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continue;
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}
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/* Skip to end of tag */
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url_fseek(s->pb, next, SEEK_SET);
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}
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2009-06-11 15:35:23 +00:00
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if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
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2009-06-11 15:26:57 +00:00
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url_fskip(s->pb, 10);
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return;
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error:
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av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
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url_fskip(s->pb, len);
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}
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