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256 lines
6.7 KiB
256 lines
6.7 KiB
/* |
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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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/* 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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{ "TCOM", "composer"}, |
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{ "TCON", "genre"}, |
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{ "TCOP", "copyright"}, |
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{ "TDRL", "date"}, |
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{ "TENC", "encoder"}, |
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{ "TIT2", "title"}, |
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{ "TLAN", "language"}, |
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{ "TPE1", "author"}, |
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{ "TPOS", "disc"}, |
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{ "TPUB", "publisher"}, |
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{ "TRCK", "track"}, |
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{ "TSOA", "albumsort"}, |
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{ "TSOP", "authorsort"}, |
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{ "TSOT", "titlesort"}, |
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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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