mirror of https://git.ffmpeg.org/ffmpeg.git
274 lines
7.2 KiB
C
274 lines
7.2 KiB
C
/*
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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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#include "id3v1.h"
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#include "libavutil/avstring.h"
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int ff_id3v2_match(const uint8_t *buf)
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{
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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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(buf[9] & 0x80) == 0;
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}
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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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((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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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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void ff_id3v2_read(AVFormatContext *s)
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{
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int len, ret;
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uint8_t buf[ID3v2_HEADER_SIZE];
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ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
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if (ret != ID3v2_HEADER_SIZE)
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return;
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if (ff_id3v2_match(buf)) {
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/* parse ID3v2 header */
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len = ((buf[6] & 0x7f) << 21) |
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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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ff_id3v2_parse(s, len, buf[3], buf[5]);
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} else {
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url_fseek(s->pb, 0, SEEK_SET);
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}
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}
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static unsigned int get_size(ByteIOContext *s, int len)
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{
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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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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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const char *val = NULL;
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int len, dstlen = sizeof(dst) - 1;
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unsigned genre;
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unsigned int (*get)(ByteIOContext*) = get_be16;
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dst[0] = 0;
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if (taglen < 1)
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return;
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taglen--; /* account for encoding type byte */
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switch (get_byte(s->pb)) { /* encoding type */
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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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while (taglen-- && q - dst < dstlen - 7) {
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uint8_t tmp;
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PUT_UTF8(get_byte(s->pb), tmp, *q++ = tmp;)
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}
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*q = 0;
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break;
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case 1: /* UTF-16 with BOM */
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taglen -= 2;
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switch (get_be16(s->pb)) {
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case 0xfffe:
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get = get_le16;
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case 0xfeff:
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break;
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default:
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av_log(s, AV_LOG_ERROR, "Incorrect BOM value in tag %s.\n", key);
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return;
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}
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// fall-through
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case 2: /* UTF-16BE without BOM */
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q = dst;
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while (taglen > 1 && q - dst < dstlen - 7) {
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uint32_t ch;
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uint8_t tmp;
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GET_UTF16(ch, ((taglen -= 2) >= 0 ? get(s->pb) : 0), break;)
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PUT_UTF8(ch, tmp, *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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len = FFMIN(taglen, dstlen - 1);
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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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default:
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av_log(s, AV_LOG_WARNING, "Unknown encoding in tag %s\n.", key);
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}
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if (!(strcmp(key, "TCON") && strcmp(key, "TCO"))
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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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val = ff_id3v1_genre_str[genre];
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else if (!(strcmp(key, "TXXX") && strcmp(key, "TXX"))) {
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/* dst now contains two 0-terminated strings */
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dst[dstlen] = 0;
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len = strlen(dst);
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key = dst;
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val = dst + FFMIN(len + 1, dstlen);
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}
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else if (*dst)
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val = dst;
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if (val)
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av_metadata_set(&s->metadata, key, val);
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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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char tag[5];
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int64_t next;
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int taghdrlen;
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const char *reason;
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switch (version) {
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case 2:
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if (flags & 0x40) {
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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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if (flags & 0x80) {
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reason = "unsynchronization";
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goto error;
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}
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if (isv34 && flags & 0x40) /* Extended header present, just skip over it */
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url_fskip(s->pb, get_size(s->pb, 4));
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while (len >= taghdrlen) {
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if (isv34) {
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get_buffer(s->pb, tag, 4);
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tag[4] = 0;
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if(version==3){
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tlen = get_be32(s->pb);
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}else
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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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get_buffer(s->pb, tag, 3);
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tag[3] = 0;
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tlen = get_be24(s->pb);
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}
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len -= taghdrlen + tlen;
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if (len < 0)
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break;
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next = url_ftell(s->pb) + tlen;
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if (tag[0] == 'T')
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read_ttag(s, tlen, tag);
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else if (!tag[0]) {
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if (tag[1])
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av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding");
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url_fskip(s->pb, len);
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break;
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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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if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
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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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const AVMetadataConv ff_id3v2_metadata_conv[] = {
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{ "TALB", "album"},
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{ "TAL", "album"},
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{ "TCOM", "composer"},
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{ "TCON", "genre"},
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{ "TCO", "genre"},
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{ "TCOP", "copyright"},
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{ "TDRL", "date"},
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{ "TDRC", "date"},
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{ "TENC", "encoded_by"},
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{ "TEN", "encoded_by"},
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{ "TIT2", "title"},
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{ "TT2", "title"},
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{ "TLAN", "language"},
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{ "TPE1", "artist"},
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{ "TP1", "artist"},
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{ "TPE2", "album_artist"},
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{ "TP2", "album_artist"},
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{ "TPE3", "performer"},
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{ "TP3", "performer"},
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{ "TPOS", "disc"},
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{ "TPUB", "publisher"},
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{ "TRCK", "track"},
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{ "TRK", "track"},
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{ "TSOA", "album-sort"},
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{ "TSOP", "artist-sort"},
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{ "TSOT", "title-sort"},
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{ "TSSE", "encoder"},
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{ 0 }
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};
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const char ff_id3v2_tags[][4] = {
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"TALB", "TBPM", "TCOM", "TCON", "TCOP", "TDEN", "TDLY", "TDOR", "TDRC",
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"TDRL", "TDTG", "TENC", "TEXT", "TFLT", "TIPL", "TIT1", "TIT2", "TIT3",
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"TKEY", "TLAN", "TLEN", "TMCL", "TMED", "TMOO", "TOAL", "TOFN", "TOLY",
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"TOPE", "TOWN", "TPE1", "TPE2", "TPE3", "TPE4", "TPOS", "TPRO", "TPUB",
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"TRCK", "TRSN", "TRSO", "TSOA", "TSOP", "TSOT", "TSRC", "TSSE", "TSST",
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{ 0 },
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};
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