| /* |
| * 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 |
| */ |
| |
| /** |
| * @file |
| * ID3v2 header parser |
| * |
| * Specifications available at: |
| * http://id3.org/Developer_Information |
| */ |
| |
| #include "id3v2.h" |
| #include "id3v1.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/dict.h" |
| #include "avio_internal.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; |
| } |
| |
| static unsigned int get_size(AVIOContext *s, int len) |
| { |
| int v = 0; |
| while (len--) |
| v = (v << 7) + (avio_r8(s) & 0x7F); |
| return v; |
| } |
| |
| static void read_ttag(AVFormatContext *s, AVIOContext *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)(AVIOContext*) = avio_rb16; |
| |
| dst[0] = 0; |
| if (taglen < 1) |
| return; |
| |
| taglen--; /* account for encoding type byte */ |
| |
| switch (avio_r8(pb)) { /* encoding type */ |
| |
| case ID3v2_ENCODING_ISO8859: |
| q = dst; |
| while (taglen-- && q - dst < dstlen - 7) { |
| uint8_t tmp; |
| PUT_UTF8(avio_r8(pb), tmp, *q++ = tmp;) |
| } |
| *q = 0; |
| break; |
| |
| case ID3v2_ENCODING_UTF16BOM: |
| taglen -= 2; |
| switch (avio_rb16(pb)) { |
| case 0xfffe: |
| get = avio_rl16; |
| case 0xfeff: |
| break; |
| default: |
| av_log(s, AV_LOG_ERROR, "Incorrect BOM value in tag %s.\n", key); |
| return; |
| } |
| // fall-through |
| |
| case ID3v2_ENCODING_UTF16BE: |
| 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 ID3v2_ENCODING_UTF8: |
| len = FFMIN(taglen, dstlen); |
| avio_read(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_dict_set(&s->metadata, key, val, AV_DICT_DONT_OVERWRITE); |
| } |
| |
| static int is_number(const char *str) |
| { |
| while (*str >= '0' && *str <= '9') str++; |
| return !*str; |
| } |
| |
| static AVDictionaryEntry* get_date_tag(AVDictionary *m, const char *tag) |
| { |
| AVDictionaryEntry *t; |
| if ((t = av_dict_get(m, tag, NULL, AV_DICT_MATCH_CASE)) && |
| strlen(t->value) == 4 && is_number(t->value)) |
| return t; |
| return NULL; |
| } |
| |
| static void merge_date(AVDictionary **m) |
| { |
| AVDictionaryEntry *t; |
| char date[17] = {0}; // YYYY-MM-DD hh:mm |
| |
| if (!(t = get_date_tag(*m, "TYER")) && |
| !(t = get_date_tag(*m, "TYE"))) |
| return; |
| av_strlcpy(date, t->value, 5); |
| av_dict_set(m, "TYER", NULL, 0); |
| av_dict_set(m, "TYE", NULL, 0); |
| |
| if (!(t = get_date_tag(*m, "TDAT")) && |
| !(t = get_date_tag(*m, "TDA"))) |
| goto finish; |
| snprintf(date + 4, sizeof(date) - 4, "-%.2s-%.2s", t->value + 2, t->value); |
| av_dict_set(m, "TDAT", NULL, 0); |
| av_dict_set(m, "TDA", NULL, 0); |
| |
| if (!(t = get_date_tag(*m, "TIME")) && |
| !(t = get_date_tag(*m, "TIM"))) |
| goto finish; |
| snprintf(date + 10, sizeof(date) - 10, " %.2s:%.2s", t->value, t->value + 2); |
| av_dict_set(m, "TIME", NULL, 0); |
| av_dict_set(m, "TIM", NULL, 0); |
| |
| finish: |
| if (date[0]) |
| av_dict_set(m, "date", date, 0); |
| } |
| |
| static void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags) |
| { |
| int isv34, unsync; |
| unsigned tlen; |
| char tag[5]; |
| int64_t next, end = avio_tell(s->pb) + len; |
| int taghdrlen; |
| const char *reason = NULL; |
| AVIOContext 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 */ |
| avio_skip(s->pb, get_size(s->pb, 4)); |
| |
| while (len >= taghdrlen) { |
| unsigned int tflags = 0; |
| int tunsync = 0; |
| |
| if (isv34) { |
| avio_read(s->pb, tag, 4); |
| tag[4] = 0; |
| if(version==3){ |
| tlen = avio_rb32(s->pb); |
| }else |
| tlen = get_size(s->pb, 4); |
| tflags = avio_rb16(s->pb); |
| tunsync = tflags & ID3v2_FLAG_UNSYNCH; |
| } else { |
| avio_read(s->pb, tag, 3); |
| tag[3] = 0; |
| tlen = avio_rb24(s->pb); |
| } |
| if (tlen > (1<<28) || !tlen) |
| break; |
| len -= taghdrlen + tlen; |
| |
| if (len < 0) |
| break; |
| |
| next = avio_tell(s->pb) + tlen; |
| |
| if (tflags & ID3v2_FLAG_DATALEN) { |
| if (tlen < 4) |
| break; |
| avio_rb32(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); |
| avio_skip(s->pb, tlen); |
| } else if (tag[0] == 'T') { |
| if (unsync || tunsync) { |
| int i, j; |
| av_fast_malloc(&buffer, &buffer_size, tlen); |
| if (!buffer) { |
| av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", tlen); |
| goto seek; |
| } |
| for (i = 0, j = 0; i < tlen; i++, j++) { |
| buffer[j] = avio_r8(s->pb); |
| if (j > 0 && !buffer[j] && buffer[j - 1] == 0xff) { |
| /* Unsynchronised byte, skip it */ |
| j--; |
| } |
| } |
| ffio_init_context(&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"); |
| avio_skip(s->pb, tlen); |
| break; |
| } |
| /* Skip to end of tag */ |
| seek: |
| avio_seek(s->pb, next, SEEK_SET); |
| } |
| |
| if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */ |
| end += 10; |
| |
| error: |
| if (reason) |
| av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason); |
| avio_seek(s->pb, end, SEEK_SET); |
| av_free(buffer); |
| return; |
| } |
| |
| 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 = avio_tell(s->pb); |
| ret = avio_read(s->pb, buf, ID3v2_HEADER_SIZE); |
| if (ret != ID3v2_HEADER_SIZE) |
| break; |
| 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 { |
| avio_seek(s->pb, off, SEEK_SET); |
| } |
| } while (found_header); |
| ff_metadata_conv(&s->metadata, NULL, ff_id3v2_34_metadata_conv); |
| ff_metadata_conv(&s->metadata, NULL, ff_id3v2_2_metadata_conv); |
| ff_metadata_conv(&s->metadata, NULL, ff_id3v2_4_metadata_conv); |
| merge_date(&s->metadata); |
| } |
| |
| const AVMetadataConv ff_id3v2_34_metadata_conv[] = { |
| { "TALB", "album"}, |
| { "TCOM", "composer"}, |
| { "TCON", "genre"}, |
| { "TCOP", "copyright"}, |
| { "TENC", "encoded_by"}, |
| { "TIT2", "title"}, |
| { "TLAN", "language"}, |
| { "TPE1", "artist"}, |
| { "TPE2", "album_artist"}, |
| { "TPE3", "performer"}, |
| { "TPOS", "disc"}, |
| { "TPUB", "publisher"}, |
| { "TRCK", "track"}, |
| { "TSSE", "encoder"}, |
| { 0 } |
| }; |
| |
| const AVMetadataConv ff_id3v2_4_metadata_conv[] = { |
| { "TDRL", "date"}, |
| { "TDRC", "date"}, |
| { "TDEN", "creation_time"}, |
| { "TSOA", "album-sort"}, |
| { "TSOP", "artist-sort"}, |
| { "TSOT", "title-sort"}, |
| { 0 } |
| }; |
| |
| const AVMetadataConv ff_id3v2_2_metadata_conv[] = { |
| { "TAL", "album"}, |
| { "TCO", "genre"}, |
| { "TT2", "title"}, |
| { "TEN", "encoded_by"}, |
| { "TP1", "artist"}, |
| { "TP2", "album_artist"}, |
| { "TP3", "performer"}, |
| { "TRK", "track"}, |
| { 0 } |
| }; |
| |
| |
| const char ff_id3v2_tags[][4] = { |
| "TALB", "TBPM", "TCOM", "TCON", "TCOP", "TDLY", "TENC", "TEXT", |
| "TFLT", "TIT1", "TIT2", "TIT3", "TKEY", "TLAN", "TLEN", "TMED", |
| "TOAL", "TOFN", "TOLY", "TOPE", "TOWN", "TPE1", "TPE2", "TPE3", |
| "TPE4", "TPOS", "TPUB", "TRCK", "TRSN", "TRSO", "TSRC", "TSSE", |
| { 0 }, |
| }; |
| |
| const char ff_id3v2_4_tags[][4] = { |
| "TDEN", "TDOR", "TDRC", "TDRL", "TDTG", "TIPL", "TMCL", "TMOO", |
| "TPRO", "TSOA", "TSOP", "TSOT", "TSST", |
| { 0 }, |
| }; |
| |
| const char ff_id3v2_3_tags[][4] = { |
| "TDAT", "TIME", "TORY", "TRDA", "TSIZ", "TYER", |
| { 0 }, |
| }; |