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ffmpeg/libavformat/id3v2.c

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/*
* ID3v2 header parser
* Copyright (c) 2003 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "id3v2.h"
#include "id3v1.h"
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#include "metadata.h"
int ff_id3v2_match(const uint8_t *buf, const char * magic)
{
return buf[0] == magic[0] &&
buf[1] == magic[1] &&
buf[2] == magic[2] &&
buf[3] != 0xff &&
buf[4] != 0xff &&
(buf[6] & 0x80) == 0 &&
(buf[7] & 0x80) == 0 &&
(buf[8] & 0x80) == 0 &&
(buf[9] & 0x80) == 0;
}
int ff_id3v2_tag_len(const uint8_t * buf)
{
int len = ((buf[6] & 0x7f) << 21) +
((buf[7] & 0x7f) << 14) +
((buf[8] & 0x7f) << 7) +
(buf[9] & 0x7f) +
ID3v2_HEADER_SIZE;
if (buf[5] & 0x10)
len += ID3v2_HEADER_SIZE;
return len;
}
void ff_id3v2_read(AVFormatContext *s, const char *magic)
{
int len, ret;
uint8_t buf[ID3v2_HEADER_SIZE];
int found_header;
int64_t off;
do {
/* save the current offset in case there's nothing to read/skip */
off = url_ftell(s->pb);
ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
if (ret != ID3v2_HEADER_SIZE)
return;
found_header = ff_id3v2_match(buf, magic);
if (found_header) {
/* parse ID3v2 header */
len = ((buf[6] & 0x7f) << 21) |
((buf[7] & 0x7f) << 14) |
((buf[8] & 0x7f) << 7) |
(buf[9] & 0x7f);
ff_id3v2_parse(s, len, buf[3], buf[5]);
} else {
url_fseek(s->pb, off, SEEK_SET);
}
} while (found_header);
}
static unsigned int get_size(ByteIOContext *s, int len)
{
int v = 0;
while (len--)
v = (v << 7) + (get_byte(s) & 0x7F);
return v;
}
static void read_ttag(AVFormatContext *s, ByteIOContext *pb, int taglen, const char *key)
{
char *q, dst[512];
const char *val = NULL;
int len, dstlen = sizeof(dst) - 1;
unsigned genre;
unsigned int (*get)(ByteIOContext*) = get_be16;
dst[0] = 0;
if (taglen < 1)
return;
taglen--; /* account for encoding type byte */
switch (get_byte(pb)) { /* encoding type */
case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
q = dst;
while (taglen-- && q - dst < dstlen - 7) {
uint8_t tmp;
PUT_UTF8(get_byte(pb), tmp, *q++ = tmp;)
}
*q = 0;
break;
case 1: /* UTF-16 with BOM */
taglen -= 2;
switch (get_be16(pb)) {
case 0xfffe:
get = get_le16;
case 0xfeff:
break;
default:
av_log(s, AV_LOG_ERROR, "Incorrect BOM value in tag %s.\n", key);
return;
}
// fall-through
case 2: /* UTF-16BE without BOM */
q = dst;
while (taglen > 1 && q - dst < dstlen - 7) {
uint32_t ch;
uint8_t tmp;
GET_UTF16(ch, ((taglen -= 2) >= 0 ? get(pb) : 0), break;)
PUT_UTF8(ch, tmp, *q++ = tmp;)
}
*q = 0;
break;
case 3: /* UTF-8 */
len = FFMIN(taglen, dstlen);
get_buffer(pb, dst, len);
dst[len] = 0;
break;
default:
av_log(s, AV_LOG_WARNING, "Unknown encoding in tag %s\n.", key);
}
if (!(strcmp(key, "TCON") && strcmp(key, "TCO"))
&& (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1)
&& genre <= ID3v1_GENRE_MAX)
val = ff_id3v1_genre_str[genre];
else if (!(strcmp(key, "TXXX") && strcmp(key, "TXX"))) {
/* dst now contains two 0-terminated strings */
dst[dstlen] = 0;
len = strlen(dst);
key = dst;
val = dst + FFMIN(len + 1, dstlen);
}
else if (*dst)
val = dst;
if (val)
av_metadata_set2(&s->metadata, key, val, 0);
}
void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
{
int isv34, tlen, unsync;
char tag[5];
int64_t next;
int taghdrlen;
const char *reason;
ByteIOContext pb;
unsigned char *buffer = NULL;
int buffer_size = 0;
switch (version) {
case 2:
if (flags & 0x40) {
reason = "compression";
goto error;
}
isv34 = 0;
taghdrlen = 6;
break;
case 3:
case 4:
isv34 = 1;
taghdrlen = 10;
break;
default:
reason = "version";
goto error;
}
unsync = flags & 0x80;
if (isv34 && flags & 0x40) /* Extended header present, just skip over it */
url_fskip(s->pb, get_size(s->pb, 4));
while (len >= taghdrlen) {
unsigned int tflags;
int tunsync = 0;
if (isv34) {
get_buffer(s->pb, tag, 4);
tag[4] = 0;
if(version==3){
tlen = get_be32(s->pb);
}else
tlen = get_size(s->pb, 4);
tflags = get_be16(s->pb);
tunsync = tflags & ID3v2_FLAG_UNSYNCH;
} else {
get_buffer(s->pb, tag, 3);
tag[3] = 0;
tlen = get_be24(s->pb);
}
len -= taghdrlen + tlen;
if (len < 0)
break;
next = url_ftell(s->pb) + tlen;
if (tflags & ID3v2_FLAG_DATALEN) {
get_be32(s->pb);
tlen -= 4;
}
if (tflags & (ID3v2_FLAG_ENCRYPTION | ID3v2_FLAG_COMPRESSION)) {
av_log(s, AV_LOG_WARNING, "Skipping encrypted/compressed ID3v2 frame %s.\n", tag);
url_fskip(s->pb, tlen);
} else if (tag[0] == 'T') {
if (unsync || tunsync) {
int i, j;
av_fast_malloc(&buffer, &buffer_size, tlen);
for (i = 0, j = 0; i < tlen; i++, j++) {
buffer[j] = get_byte(s->pb);
if (j > 0 && !buffer[j] && buffer[j - 1] == 0xff) {
/* Unsynchronised byte, skip it */
j--;
}
}
init_put_byte(&pb, buffer, j, 0, NULL, NULL, NULL, NULL);
read_ttag(s, &pb, j, tag);
} else {
read_ttag(s, s->pb, tlen, tag);
}
}
else if (!tag[0]) {
if (tag[1])
av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding");
url_fskip(s->pb, tlen);
break;
}
/* Skip to end of tag */
url_fseek(s->pb, next, SEEK_SET);
}
ff_metadata_conv(&s->metadata, NULL, ff_id3v2_metadata_conv);
if (len > 0) {
/* Skip padding */
url_fskip(s->pb, len);
}
if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
url_fskip(s->pb, 10);
av_free(buffer);
return;
error:
av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
url_fskip(s->pb, len);
av_free(buffer);
}
const AVMetadataConv ff_id3v2_metadata_conv[] = {
{ "TALB", "album"},
{ "TAL", "album"},
{ "TCOM", "composer"},
{ "TCON", "genre"},
{ "TCO", "genre"},
{ "TCOP", "copyright"},
{ "TDRL", "date"},
{ "TDRC", "date"},
{ "TDEN", "creation_time"},
{ "TENC", "encoded_by"},
{ "TEN", "encoded_by"},
{ "TIT2", "title"},
{ "TT2", "title"},
{ "TLAN", "language"},
{ "TPE1", "artist"},
{ "TP1", "artist"},
{ "TPE2", "album_artist"},
{ "TP2", "album_artist"},
{ "TPE3", "performer"},
{ "TP3", "performer"},
{ "TPOS", "disc"},
{ "TPUB", "publisher"},
{ "TRCK", "track"},
{ "TRK", "track"},
{ "TSOA", "album-sort"},
{ "TSOP", "artist-sort"},
{ "TSOT", "title-sort"},
{ "TSSE", "encoder"},
{ 0 }
};
const char ff_id3v2_tags[][4] = {
"TALB", "TBPM", "TCOM", "TCON", "TCOP", "TDEN", "TDLY", "TDOR", "TDRC",
"TDRL", "TDTG", "TENC", "TEXT", "TFLT", "TIPL", "TIT1", "TIT2", "TIT3",
"TKEY", "TLAN", "TLEN", "TMCL", "TMED", "TMOO", "TOAL", "TOFN", "TOLY",
"TOPE", "TOWN", "TPE1", "TPE2", "TPE3", "TPE4", "TPOS", "TPRO", "TPUB",
"TRCK", "TRSN", "TRSO", "TSOA", "TSOP", "TSOT", "TSRC", "TSSE", "TSST",
{ 0 },
};
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