| /* |
| * 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" |
| |
| int ff_id3v2_match(const uint8_t *buf) |
| { |
| return buf[0] == 'I' && |
| buf[1] == 'D' && |
| buf[2] == '3' && |
| 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) |
| { |
| int len, ret; |
| uint8_t buf[ID3v2_HEADER_SIZE]; |
| |
| ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE); |
| if (ret != ID3v2_HEADER_SIZE) |
| return; |
| if (ff_id3v2_match(buf)) { |
| /* 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, 0, SEEK_SET); |
| } |
| } |
| |
| 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, 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(s->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(s->pb), tmp, *q++ = tmp;) |
| } |
| *q = 0; |
| break; |
| |
| case 1: /* UTF-16 with BOM */ |
| taglen -= 2; |
| switch (get_be16(s->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(s->pb) : 0), break;) |
| PUT_UTF8(ch, tmp, *q++ = tmp;) |
| } |
| *q = 0; |
| break; |
| |
| case 3: /* UTF-8 */ |
| len = FFMIN(taglen, dstlen); |
| get_buffer(s->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; |
| char tag[5]; |
| int64_t next; |
| int taghdrlen; |
| const char *reason; |
| |
| 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; |
| } |
| |
| if (flags & 0x80) { |
| reason = "unsynchronization"; |
| goto error; |
| } |
| |
| if (isv34 && flags & 0x40) /* Extended header present, just skip over it */ |
| url_fskip(s->pb, get_size(s->pb, 4)); |
| |
| while (len >= taghdrlen) { |
| 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); |
| get_be16(s->pb); /* flags */ |
| } 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 (tag[0] == 'T') |
| read_ttag(s, tlen, tag); |
| else if (!tag[0]) { |
| if (tag[1]) |
| av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding"); |
| url_fskip(s->pb, len); |
| break; |
| } |
| /* Skip to end of tag */ |
| url_fseek(s->pb, next, SEEK_SET); |
| } |
| |
| if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */ |
| url_fskip(s->pb, 10); |
| return; |
| |
| error: |
| av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason); |
| url_fskip(s->pb, len); |
| } |
| |
| const AVMetadataConv ff_id3v2_metadata_conv[] = { |
| { "TALB", "album"}, |
| { "TAL", "album"}, |
| { "TCOM", "composer"}, |
| { "TCON", "genre"}, |
| { "TCO", "genre"}, |
| { "TCOP", "copyright"}, |
| { "TDRL", "date"}, |
| { "TDRC", "date"}, |
| { "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 }, |
| }; |