2 * Copyright (c) 2003 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * Specifications available at:
26 * http://id3.org/Developer_Information
35 #include "libavutil/avstring.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/intreadwrite.h"
38 #include "avio_internal.h"
43 const AVMetadataConv ff_id3v2_34_metadata_conv[] = {
45 { "TCOM", "composer" },
47 { "TCOP", "copyright" },
48 { "TENC", "encoded_by" },
50 { "TLAN", "language" },
52 { "TPE2", "album_artist" },
53 { "TPE3", "performer" },
55 { "TPUB", "publisher" },
57 { "TSSE", "encoder" },
62 const AVMetadataConv ff_id3v2_4_metadata_conv[] = {
63 { "TCMP", "compilation" },
66 { "TDEN", "creation_time" },
67 { "TSOA", "album-sort" },
68 { "TSOP", "artist-sort" },
69 { "TSOT", "title-sort" },
73 static const AVMetadataConv id3v2_2_metadata_conv[] = {
76 { "TCP", "compilation" },
78 { "TEN", "encoded_by" },
80 { "TP2", "album_artist" },
81 { "TP3", "performer" },
86 const char ff_id3v2_tags[][4] = {
87 "TALB", "TBPM", "TCOM", "TCON", "TCOP", "TDLY", "TENC", "TEXT",
88 "TFLT", "TIT1", "TIT2", "TIT3", "TKEY", "TLAN", "TLEN", "TMED",
89 "TOAL", "TOFN", "TOLY", "TOPE", "TOWN", "TPE1", "TPE2", "TPE3",
90 "TPE4", "TPOS", "TPUB", "TRCK", "TRSN", "TRSO", "TSRC", "TSSE",
94 const char ff_id3v2_4_tags[][4] = {
95 "TDEN", "TDOR", "TDRC", "TDRL", "TDTG", "TIPL", "TMCL", "TMOO",
96 "TPRO", "TSOA", "TSOP", "TSOT", "TSST",
100 const char ff_id3v2_3_tags[][4] = {
101 "TDAT", "TIME", "TORY", "TRDA", "TSIZ", "TYER",
105 const char *ff_id3v2_picture_types[21] = {
107 "32x32 pixels 'file icon'",
112 "Media (e.g. label side of CD)",
113 "Lead artist/lead performer/soloist",
118 "Lyricist/text writer",
119 "Recording Location",
121 "During performance",
122 "Movie/video screen capture",
123 "A bright coloured fish",
125 "Band/artist logotype",
126 "Publisher/Studio logotype",
129 const CodecMime ff_id3v2_mime_tags[] = {
130 { "image/gif", AV_CODEC_ID_GIF },
131 { "image/jpeg", AV_CODEC_ID_MJPEG },
132 { "image/jpg", AV_CODEC_ID_MJPEG },
133 { "image/png", AV_CODEC_ID_PNG },
134 { "image/tiff", AV_CODEC_ID_TIFF },
135 { "image/bmp", AV_CODEC_ID_BMP },
136 { "JPG", AV_CODEC_ID_MJPEG }, /* ID3v2.2 */
137 { "PNG", AV_CODEC_ID_PNG }, /* ID3v2.2 */
138 { "", AV_CODEC_ID_NONE },
141 int ff_id3v2_match(const uint8_t *buf, const char *magic)
143 return buf[0] == magic[0] &&
144 buf[1] == magic[1] &&
145 buf[2] == magic[2] &&
148 (buf[6] & 0x80) == 0 &&
149 (buf[7] & 0x80) == 0 &&
150 (buf[8] & 0x80) == 0 &&
151 (buf[9] & 0x80) == 0;
154 int ff_id3v2_tag_len(const uint8_t *buf)
156 int len = ((buf[6] & 0x7f) << 21) +
157 ((buf[7] & 0x7f) << 14) +
158 ((buf[8] & 0x7f) << 7) +
162 len += ID3v2_HEADER_SIZE;
166 static unsigned int get_size(AVIOContext *s, int len)
170 v = (v << 7) + (avio_r8(s) & 0x7F);
174 static unsigned int size_to_syncsafe(unsigned int size)
176 return (((size) & (0x7f << 0)) >> 0) +
177 (((size) & (0x7f << 8)) >> 1) +
178 (((size) & (0x7f << 16)) >> 2) +
179 (((size) & (0x7f << 24)) >> 3);
182 /* No real verification, only check that the tag consists of
183 * a combination of capital alpha-numerical characters */
184 static int is_tag(const char *buf, unsigned int len)
190 if ((buf[len] < 'A' ||
200 * Return 1 if the tag of length len at the given offset is valid, 0 if not, -1 on error
202 static int check_tag(AVIOContext *s, int offset, unsigned int len)
207 avio_seek(s, offset, SEEK_SET) < 0 ||
208 avio_read(s, tag, len) < (int)len)
210 else if (!AV_RB32(tag) || is_tag(tag, len))
217 * Free GEOB type extra metadata.
219 static void free_geobtag(void *obj)
221 ID3v2ExtraMetaGEOB *geob = obj;
222 av_freep(&geob->mime_type);
223 av_freep(&geob->file_name);
224 av_freep(&geob->description);
225 av_freep(&geob->data);
230 * Decode characters to UTF-8 according to encoding type. The decoded buffer is
231 * always null terminated. Stop reading when either *maxread bytes are read from
232 * pb or U+0000 character is found.
234 * @param dst Pointer where the address of the buffer with the decoded bytes is
235 * stored. Buffer must be freed by caller.
236 * @param maxread Pointer to maximum number of characters to read from the
237 * AVIOContext. After execution the value is decremented by the number of bytes
239 * @returns 0 if no error occurred, dst is uninitialized on error
241 static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
242 uint8_t **dst, int *maxread)
248 unsigned int (*get)(AVIOContext*) = avio_rb16;
251 if ((ret = avio_open_dyn_buf(&dynbuf)) < 0) {
252 av_log(s, AV_LOG_ERROR, "Error opening memory stream\n");
257 case ID3v2_ENCODING_ISO8859:
260 PUT_UTF8(ch, tmp, avio_w8(dynbuf, tmp);)
265 case ID3v2_ENCODING_UTF16BOM:
266 if ((left -= 2) < 0) {
267 av_log(s, AV_LOG_ERROR, "Cannot read BOM value, input too short\n");
268 ffio_free_dyn_buf(&dynbuf);
270 return AVERROR_INVALIDDATA;
272 switch (avio_rb16(pb)) {
278 av_log(s, AV_LOG_ERROR, "Incorrect BOM value\n");
279 ffio_free_dyn_buf(&dynbuf);
282 return AVERROR_INVALIDDATA;
286 case ID3v2_ENCODING_UTF16BE:
287 while ((left > 1) && ch) {
288 GET_UTF16(ch, ((left -= 2) >= 0 ? get(pb) : 0), break;)
289 PUT_UTF8(ch, tmp, avio_w8(dynbuf, tmp);)
292 left += 2; /* did not read last char from pb */
295 case ID3v2_ENCODING_UTF8:
303 av_log(s, AV_LOG_WARNING, "Unknown encoding\n");
309 avio_close_dyn_buf(dynbuf, dst);
318 static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen,
319 AVDictionary **metadata, const char *key)
322 int encoding, dict_flags = AV_DICT_DONT_OVERWRITE | AV_DICT_DONT_STRDUP_VAL;
328 encoding = avio_r8(pb);
329 taglen--; /* account for encoding type byte */
331 if (decode_str(s, pb, encoding, &dst, &taglen) < 0) {
332 av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", key);
336 if (!(strcmp(key, "TCON") && strcmp(key, "TCO")) &&
337 (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1) &&
338 genre <= ID3v1_GENRE_MAX) {
340 dst = av_strdup(ff_id3v1_genre_str[genre]);
341 } else if (!(strcmp(key, "TXXX") && strcmp(key, "TXX"))) {
342 /* dst now contains the key, need to get value */
344 if (decode_str(s, pb, encoding, &dst, &taglen) < 0) {
345 av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", key);
349 dict_flags |= AV_DICT_DONT_STRDUP_KEY;
354 av_dict_set(metadata, key, dst, dict_flags);
357 static void read_uslt(AVFormatContext *s, AVIOContext *pb, int taglen,
358 AVDictionary **metadata)
361 uint8_t *descriptor = NULL; // 'Content descriptor'
362 uint8_t *text = NULL;
370 encoding = avio_r8(pb);
373 if (avio_read(pb, lang, 3) < 3)
378 if (decode_str(s, pb, encoding, &descriptor, &taglen) < 0)
381 if (decode_str(s, pb, encoding, &text, &taglen) < 0)
384 // FFmpeg does not support hierarchical metadata, so concatenate the keys.
385 key = av_asprintf("lyrics-%s%s%s", descriptor[0] ? (char *)descriptor : "",
386 descriptor[0] ? "-" : "",
391 av_dict_set(metadata, key, text, 0);
396 av_log(s, AV_LOG_ERROR, "Error reading lyrics, skipped\n");
403 * Parse a comment tag.
405 static void read_comment(AVFormatContext *s, AVIOContext *pb, int taglen,
406 AVDictionary **metadata)
408 const char *key = "comment";
410 int encoding, dict_flags = AV_DICT_DONT_OVERWRITE | AV_DICT_DONT_STRDUP_VAL;
411 av_unused int language;
416 encoding = avio_r8(pb);
417 language = avio_rl24(pb);
420 if (decode_str(s, pb, encoding, &dst, &taglen) < 0) {
421 av_log(s, AV_LOG_ERROR, "Error reading comment frame, skipped\n");
429 key = (const char *) dst;
430 dict_flags |= AV_DICT_DONT_STRDUP_KEY;
433 if (decode_str(s, pb, encoding, &dst, &taglen) < 0) {
434 av_log(s, AV_LOG_ERROR, "Error reading comment frame, skipped\n");
435 if (dict_flags & AV_DICT_DONT_STRDUP_KEY)
436 av_freep((void*)&key);
441 av_dict_set(metadata, key, (const char *) dst, dict_flags);
445 * Parse GEOB tag into a ID3v2ExtraMetaGEOB struct.
447 static void read_geobtag(AVFormatContext *s, AVIOContext *pb, int taglen,
448 const char *tag, ID3v2ExtraMeta **extra_meta,
451 ID3v2ExtraMetaGEOB *geob_data = NULL;
452 ID3v2ExtraMeta *new_extra = NULL;
459 geob_data = av_mallocz(sizeof(ID3v2ExtraMetaGEOB));
461 av_log(s, AV_LOG_ERROR, "Failed to alloc %"SIZE_SPECIFIER" bytes\n",
462 sizeof(ID3v2ExtraMetaGEOB));
466 new_extra = av_mallocz(sizeof(ID3v2ExtraMeta));
468 av_log(s, AV_LOG_ERROR, "Failed to alloc %"SIZE_SPECIFIER" bytes\n",
469 sizeof(ID3v2ExtraMeta));
473 /* read encoding type byte */
474 encoding = avio_r8(pb);
477 /* read MIME type (always ISO-8859) */
478 if (decode_str(s, pb, ID3v2_ENCODING_ISO8859, &geob_data->mime_type,
484 if (decode_str(s, pb, encoding, &geob_data->file_name, &taglen) < 0 ||
488 /* read content description */
489 if (decode_str(s, pb, encoding, &geob_data->description, &taglen) < 0 ||
494 /* save encapsulated binary data */
495 geob_data->data = av_malloc(taglen);
496 if (!geob_data->data) {
497 av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", taglen);
500 if ((len = avio_read(pb, geob_data->data, taglen)) < taglen)
501 av_log(s, AV_LOG_WARNING,
502 "Error reading GEOB frame, data truncated.\n");
503 geob_data->datasize = len;
505 geob_data->data = NULL;
506 geob_data->datasize = 0;
509 /* add data to the list */
510 new_extra->tag = "GEOB";
511 new_extra->data = geob_data;
512 new_extra->next = *extra_meta;
513 *extra_meta = new_extra;
518 av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", tag);
519 free_geobtag(geob_data);
524 static int is_number(const char *str)
526 while (*str >= '0' && *str <= '9')
531 static AVDictionaryEntry *get_date_tag(AVDictionary *m, const char *tag)
533 AVDictionaryEntry *t;
534 if ((t = av_dict_get(m, tag, NULL, AV_DICT_MATCH_CASE)) &&
535 strlen(t->value) == 4 && is_number(t->value))
540 static void merge_date(AVDictionary **m)
542 AVDictionaryEntry *t;
543 char date[17] = { 0 }; // YYYY-MM-DD hh:mm
545 if (!(t = get_date_tag(*m, "TYER")) &&
546 !(t = get_date_tag(*m, "TYE")))
548 av_strlcpy(date, t->value, 5);
549 av_dict_set(m, "TYER", NULL, 0);
550 av_dict_set(m, "TYE", NULL, 0);
552 if (!(t = get_date_tag(*m, "TDAT")) &&
553 !(t = get_date_tag(*m, "TDA")))
555 snprintf(date + 4, sizeof(date) - 4, "-%.2s-%.2s", t->value + 2, t->value);
556 av_dict_set(m, "TDAT", NULL, 0);
557 av_dict_set(m, "TDA", NULL, 0);
559 if (!(t = get_date_tag(*m, "TIME")) &&
560 !(t = get_date_tag(*m, "TIM")))
562 snprintf(date + 10, sizeof(date) - 10,
563 " %.2s:%.2s", t->value, t->value + 2);
564 av_dict_set(m, "TIME", NULL, 0);
565 av_dict_set(m, "TIM", NULL, 0);
569 av_dict_set(m, "date", date, 0);
572 static void free_apic(void *obj)
574 ID3v2ExtraMetaAPIC *apic = obj;
575 av_buffer_unref(&apic->buf);
576 av_freep(&apic->description);
580 static void rstrip_spaces(char *buf)
582 size_t len = strlen(buf);
583 while (len > 0 && buf[len - 1] == ' ')
587 static void read_apic(AVFormatContext *s, AVIOContext *pb, int taglen,
588 const char *tag, ID3v2ExtraMeta **extra_meta,
593 const CodecMime *mime = ff_id3v2_mime_tags;
594 enum AVCodecID id = AV_CODEC_ID_NONE;
595 ID3v2ExtraMetaAPIC *apic = NULL;
596 ID3v2ExtraMeta *new_extra = NULL;
597 int64_t end = avio_tell(pb) + taglen;
599 if (taglen <= 4 || (!isv34 && taglen <= 6))
602 new_extra = av_mallocz(sizeof(*new_extra));
603 apic = av_mallocz(sizeof(*apic));
604 if (!new_extra || !apic)
612 taglen -= avio_get_str(pb, taglen, mimetype, sizeof(mimetype));
614 avio_read(pb, mimetype, 3);
619 while (mime->id != AV_CODEC_ID_NONE) {
620 if (!av_strncasecmp(mime->str, mimetype, sizeof(mimetype))) {
626 if (id == AV_CODEC_ID_NONE) {
627 av_log(s, AV_LOG_WARNING,
628 "Unknown attached picture mimetype: %s, skipping.\n", mimetype);
634 pic_type = avio_r8(pb);
636 if (pic_type < 0 || pic_type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types)) {
637 av_log(s, AV_LOG_WARNING, "Unknown attached picture type %d.\n",
641 apic->type = ff_id3v2_picture_types[pic_type];
643 /* description and picture data */
644 if (decode_str(s, pb, enc, &apic->description, &taglen) < 0) {
645 av_log(s, AV_LOG_ERROR,
646 "Error decoding attached picture description.\n");
650 apic->buf = av_buffer_alloc(taglen + AV_INPUT_BUFFER_PADDING_SIZE);
651 if (!apic->buf || !taglen || avio_read(pb, apic->buf->data, taglen) != taglen)
653 memset(apic->buf->data + taglen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
655 new_extra->tag = "APIC";
656 new_extra->data = apic;
657 new_extra->next = *extra_meta;
658 *extra_meta = new_extra;
660 // The description must be unique, and some ID3v2 tag writers add spaces
661 // to write several APIC entries with the same description.
662 rstrip_spaces(apic->description);
669 av_freep(&new_extra);
670 avio_seek(pb, end, SEEK_SET);
673 static void read_chapter(AVFormatContext *s, AVIOContext *pb, int len, const char *ttag, ID3v2ExtraMeta **extra_meta, int isv34)
675 AVRational time_base = {1, 1000};
683 /* We should probably just put the chapter data to extra_meta here
684 * and do the AVFormatContext-needing part in a separate
685 * ff_id3v2_parse_apic()-like function. */
686 av_log(NULL, AV_LOG_DEBUG, "No AVFormatContext, skipped ID3 chapter data\n");
690 if (decode_str(s, pb, 0, &dst, &len) < 0)
695 start = avio_rb32(pb);
699 chapter = avpriv_new_chapter(s, s->nb_chapters + 1, time_base, start, end, dst);
707 if (avio_read(pb, tag, 4) < 4)
710 taglen = avio_rb32(pb);
713 if (taglen < 0 || taglen > len)
716 read_ttag(s, pb, taglen, &chapter->metadata, tag);
718 avio_skip(pb, taglen);
722 ff_metadata_conv(&chapter->metadata, NULL, ff_id3v2_34_metadata_conv);
723 ff_metadata_conv(&chapter->metadata, NULL, ff_id3v2_4_metadata_conv);
728 static void free_priv(void *obj)
730 ID3v2ExtraMetaPRIV *priv = obj;
731 av_freep(&priv->owner);
732 av_freep(&priv->data);
736 static void read_priv(AVFormatContext *s, AVIOContext *pb, int taglen,
737 const char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
739 ID3v2ExtraMeta *meta;
740 ID3v2ExtraMetaPRIV *priv;
742 meta = av_mallocz(sizeof(*meta));
743 priv = av_mallocz(sizeof(*priv));
748 if (decode_str(s, pb, ID3v2_ENCODING_ISO8859, &priv->owner, &taglen) < 0)
751 priv->data = av_malloc(taglen);
755 priv->datasize = taglen;
757 if (avio_read(pb, priv->data, priv->datasize) != priv->datasize)
762 meta->next = *extra_meta;
773 typedef struct ID3v2EMFunc {
776 void (*read)(AVFormatContext *s, AVIOContext *pb, int taglen,
777 const char *tag, ID3v2ExtraMeta **extra_meta,
779 void (*free)(void *obj);
782 static const ID3v2EMFunc id3v2_extra_meta_funcs[] = {
783 { "GEO", "GEOB", read_geobtag, free_geobtag },
784 { "PIC", "APIC", read_apic, free_apic },
785 { "CHAP","CHAP", read_chapter, NULL },
786 { "PRIV","PRIV", read_priv, free_priv },
791 * Get the corresponding ID3v2EMFunc struct for a tag.
792 * @param isv34 Determines if v2.2 or v2.3/4 strings are used
793 * @return A pointer to the ID3v2EMFunc struct if found, NULL otherwise.
795 static const ID3v2EMFunc *get_extra_meta_func(const char *tag, int isv34)
798 while (id3v2_extra_meta_funcs[i].tag3) {
799 if (tag && !memcmp(tag,
800 (isv34 ? id3v2_extra_meta_funcs[i].tag4 :
801 id3v2_extra_meta_funcs[i].tag3),
803 return &id3v2_extra_meta_funcs[i];
809 static void id3v2_parse(AVIOContext *pb, AVDictionary **metadata,
810 AVFormatContext *s, int len, uint8_t version,
811 uint8_t flags, ID3v2ExtraMeta **extra_meta)
816 int64_t next, end = avio_tell(pb) + len;
818 const char *reason = NULL;
819 AVIOContext pb_local;
821 unsigned char *buffer = NULL;
823 const ID3v2EMFunc *extra_func = NULL;
824 unsigned char *uncompressed_buffer = NULL;
825 av_unused int uncompressed_buffer_size = 0;
826 const char *comm_frame;
828 av_log(s, AV_LOG_DEBUG, "id3v2 ver:%d flags:%02X len:%d\n", version, flags, len);
833 reason = "compression";
853 unsync = flags & 0x80;
855 if (isv34 && flags & 0x40) { /* Extended header present, just skip over it */
856 int extlen = get_size(pb, 4);
858 /* In v2.4 the length includes the length field we just read. */
862 reason = "invalid extended header length";
865 avio_skip(pb, extlen);
868 reason = "extended header too long.";
873 while (len >= taghdrlen) {
874 unsigned int tflags = 0;
878 unsigned long av_unused dlen;
881 if (avio_read(pb, tag, 4) < 4)
885 tlen = avio_rb32(pb);
887 /* some encoders incorrectly uses v3 sizes instead of syncsafe ones
888 * so check the next tag to see which one to use */
889 tlen = avio_rb32(pb);
892 int64_t cur = avio_tell(pb);
894 if (ffio_ensure_seekback(pb, 2 /* tflags */ + tlen + 4 /* next tag */))
897 if (check_tag(pb, cur + 2 + size_to_syncsafe(tlen), 4) == 1)
898 tlen = size_to_syncsafe(tlen);
899 else if (check_tag(pb, cur + 2 + tlen, 4) != 1)
901 avio_seek(pb, cur, SEEK_SET);
903 tlen = size_to_syncsafe(tlen);
906 tflags = avio_rb16(pb);
907 tunsync = tflags & ID3v2_FLAG_UNSYNCH;
909 if (avio_read(pb, tag, 3) < 3)
912 tlen = avio_rb24(pb);
916 len -= taghdrlen + tlen;
921 next = avio_tell(pb) + tlen;
925 av_log(s, AV_LOG_DEBUG, "Invalid empty frame %s, skipping.\n",
930 if (tflags & ID3v2_FLAG_DATALEN) {
933 dlen = avio_rb32(pb);
938 tcomp = tflags & ID3v2_FLAG_COMPRESSION;
939 tencr = tflags & ID3v2_FLAG_ENCRYPTION;
941 /* skip encrypted tags and, if no zlib, compressed tags */
942 if (tencr || (!CONFIG_ZLIB && tcomp)) {
949 type = "encrypted and compressed";
951 av_log(s, AV_LOG_WARNING, "Skipping %s ID3v2 frame %s.\n", type, tag);
953 /* check for text tag or supported special meta tag */
954 } else if (tag[0] == 'T' ||
955 !memcmp(tag, "USLT", 4) ||
956 !strcmp(tag, comm_frame) ||
958 (extra_func = get_extra_meta_func(tag, isv34)))) {
961 if (unsync || tunsync || tcomp) {
962 av_fast_malloc(&buffer, &buffer_size, tlen);
964 av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", tlen);
968 if (unsync || tunsync) {
969 int64_t end = avio_tell(pb) + tlen;
973 while (avio_tell(pb) < end && b - buffer < tlen && !pb->eof_reached) {
975 if (*(b - 1) == 0xff && avio_tell(pb) < end - 1 &&
978 uint8_t val = avio_r8(pb);
979 *b++ = val ? val : avio_r8(pb);
982 ffio_init_context(&pb_local, buffer, b - buffer, 0, NULL, NULL, NULL,
985 pbx = &pb_local; // read from sync buffer
992 av_log(s, AV_LOG_DEBUG, "Compresssed frame %s tlen=%d dlen=%ld\n", tag, tlen, dlen);
994 av_fast_malloc(&uncompressed_buffer, &uncompressed_buffer_size, dlen);
995 if (!uncompressed_buffer) {
996 av_log(s, AV_LOG_ERROR, "Failed to alloc %ld bytes\n", dlen);
1000 if (!(unsync || tunsync)) {
1001 err = avio_read(pb, buffer, tlen);
1003 av_log(s, AV_LOG_ERROR, "Failed to read compressed tag\n");
1009 err = uncompress(uncompressed_buffer, &dlen, buffer, tlen);
1011 av_log(s, AV_LOG_ERROR, "Failed to uncompress tag: %d\n", err);
1014 ffio_init_context(&pb_local, uncompressed_buffer, dlen, 0, NULL, NULL, NULL, NULL);
1016 pbx = &pb_local; // read from sync buffer
1020 /* parse text tag */
1021 read_ttag(s, pbx, tlen, metadata, tag);
1022 else if (!memcmp(tag, "USLT", 4))
1023 read_uslt(s, pbx, tlen, metadata);
1024 else if (!strcmp(tag, comm_frame))
1025 read_comment(s, pbx, tlen, metadata);
1027 /* parse special meta tag */
1028 extra_func->read(s, pbx, tlen, tag, extra_meta, isv34);
1029 } else if (!tag[0]) {
1031 av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding\n");
1032 avio_skip(pb, tlen);
1035 /* Skip to end of tag */
1037 avio_seek(pb, next, SEEK_SET);
1040 /* Footer preset, always 10 bytes, skip over it */
1041 if (version == 4 && flags & 0x10)
1046 av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n",
1048 avio_seek(pb, end, SEEK_SET);
1050 av_free(uncompressed_buffer);
1054 static void id3v2_read_internal(AVIOContext *pb, AVDictionary **metadata,
1055 AVFormatContext *s, const char *magic,
1056 ID3v2ExtraMeta **extra_meta, int64_t max_search_size)
1059 uint8_t buf[ID3v2_HEADER_SIZE];
1063 if (max_search_size && max_search_size < ID3v2_HEADER_SIZE)
1066 start = avio_tell(pb);
1068 /* save the current offset in case there's nothing to read/skip */
1069 off = avio_tell(pb);
1070 if (max_search_size && off - start >= max_search_size - ID3v2_HEADER_SIZE) {
1071 avio_seek(pb, off, SEEK_SET);
1075 ret = avio_read(pb, buf, ID3v2_HEADER_SIZE);
1076 if (ret != ID3v2_HEADER_SIZE) {
1077 avio_seek(pb, off, SEEK_SET);
1080 found_header = ff_id3v2_match(buf, magic);
1082 /* parse ID3v2 header */
1083 len = ((buf[6] & 0x7f) << 21) |
1084 ((buf[7] & 0x7f) << 14) |
1085 ((buf[8] & 0x7f) << 7) |
1087 id3v2_parse(pb, metadata, s, len, buf[3], buf[5], extra_meta);
1089 avio_seek(pb, off, SEEK_SET);
1091 } while (found_header);
1092 ff_metadata_conv(metadata, NULL, ff_id3v2_34_metadata_conv);
1093 ff_metadata_conv(metadata, NULL, id3v2_2_metadata_conv);
1094 ff_metadata_conv(metadata, NULL, ff_id3v2_4_metadata_conv);
1095 merge_date(metadata);
1098 void ff_id3v2_read_dict(AVIOContext *pb, AVDictionary **metadata,
1099 const char *magic, ID3v2ExtraMeta **extra_meta)
1101 id3v2_read_internal(pb, metadata, NULL, magic, extra_meta, 0);
1104 void ff_id3v2_read(AVFormatContext *s, const char *magic,
1105 ID3v2ExtraMeta **extra_meta, unsigned int max_search_size)
1107 id3v2_read_internal(s->pb, &s->metadata, s, magic, extra_meta, max_search_size);
1110 void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
1112 ID3v2ExtraMeta *current = *extra_meta, *next;
1113 const ID3v2EMFunc *extra_func;
1116 if ((extra_func = get_extra_meta_func(current->tag, 1)))
1117 extra_func->free(current->data);
1118 next = current->next;
1126 int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
1128 ID3v2ExtraMeta *cur;
1130 for (cur = *extra_meta; cur; cur = cur->next) {
1131 ID3v2ExtraMetaAPIC *apic;
1134 if (strcmp(cur->tag, "APIC"))
1138 if (!(st = avformat_new_stream(s, NULL)))
1139 return AVERROR(ENOMEM);
1141 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
1142 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
1143 st->codecpar->codec_id = apic->id;
1145 if (AV_RB64(apic->buf->data) == 0x89504e470d0a1a0a)
1146 st->codecpar->codec_id = AV_CODEC_ID_PNG;
1148 if (apic->description[0])
1149 av_dict_set(&st->metadata, "title", apic->description, 0);
1151 av_dict_set(&st->metadata, "comment", apic->type, 0);
1153 av_init_packet(&st->attached_pic);
1154 st->attached_pic.buf = apic->buf;
1155 st->attached_pic.data = apic->buf->data;
1156 st->attached_pic.size = apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE;
1157 st->attached_pic.stream_index = st->index;
1158 st->attached_pic.flags |= AV_PKT_FLAG_KEY;