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) < 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 avio_close_dyn_buf(dynbuf, dst);
270 return AVERROR_INVALIDDATA;
272 switch (avio_rb16(pb)) {
278 av_log(s, AV_LOG_ERROR, "Incorrect BOM value\n");
279 avio_close_dyn_buf(dynbuf, dst);
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;
371 encoding = avio_r8(pb);
374 if (avio_read(pb, lang, 3) < 3)
379 if (decode_str(s, pb, encoding, &descriptor, &taglen) < 0)
382 if (decode_str(s, pb, encoding, &text, &taglen) < 0)
385 // FFmpeg does not support hierarchical metadata, so concatenate the keys.
386 key = av_asprintf("lyrics-%s%s%s", descriptor[0] ? (char *)descriptor : "",
387 descriptor[0] ? "-" : "",
392 av_dict_set(metadata, key, text, 0);
397 av_log(s, AV_LOG_ERROR, "Error reading lyrics, skipped\n");
404 * Parse GEOB tag into a ID3v2ExtraMetaGEOB struct.
406 static void read_geobtag(AVFormatContext *s, AVIOContext *pb, int taglen,
407 char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
409 ID3v2ExtraMetaGEOB *geob_data = NULL;
410 ID3v2ExtraMeta *new_extra = NULL;
417 geob_data = av_mallocz(sizeof(ID3v2ExtraMetaGEOB));
419 av_log(s, AV_LOG_ERROR, "Failed to alloc %"SIZE_SPECIFIER" bytes\n",
420 sizeof(ID3v2ExtraMetaGEOB));
424 new_extra = av_mallocz(sizeof(ID3v2ExtraMeta));
426 av_log(s, AV_LOG_ERROR, "Failed to alloc %"SIZE_SPECIFIER" bytes\n",
427 sizeof(ID3v2ExtraMeta));
431 /* read encoding type byte */
432 encoding = avio_r8(pb);
435 /* read MIME type (always ISO-8859) */
436 if (decode_str(s, pb, ID3v2_ENCODING_ISO8859, &geob_data->mime_type,
442 if (decode_str(s, pb, encoding, &geob_data->file_name, &taglen) < 0 ||
446 /* read content description */
447 if (decode_str(s, pb, encoding, &geob_data->description, &taglen) < 0 ||
452 /* save encapsulated binary data */
453 geob_data->data = av_malloc(taglen);
454 if (!geob_data->data) {
455 av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", taglen);
458 if ((len = avio_read(pb, geob_data->data, taglen)) < taglen)
459 av_log(s, AV_LOG_WARNING,
460 "Error reading GEOB frame, data truncated.\n");
461 geob_data->datasize = len;
463 geob_data->data = NULL;
464 geob_data->datasize = 0;
467 /* add data to the list */
468 new_extra->tag = "GEOB";
469 new_extra->data = geob_data;
470 new_extra->next = *extra_meta;
471 *extra_meta = new_extra;
476 av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", tag);
477 free_geobtag(geob_data);
482 static int is_number(const char *str)
484 while (*str >= '0' && *str <= '9')
489 static AVDictionaryEntry *get_date_tag(AVDictionary *m, const char *tag)
491 AVDictionaryEntry *t;
492 if ((t = av_dict_get(m, tag, NULL, AV_DICT_MATCH_CASE)) &&
493 strlen(t->value) == 4 && is_number(t->value))
498 static void merge_date(AVDictionary **m)
500 AVDictionaryEntry *t;
501 char date[17] = { 0 }; // YYYY-MM-DD hh:mm
503 if (!(t = get_date_tag(*m, "TYER")) &&
504 !(t = get_date_tag(*m, "TYE")))
506 av_strlcpy(date, t->value, 5);
507 av_dict_set(m, "TYER", NULL, 0);
508 av_dict_set(m, "TYE", NULL, 0);
510 if (!(t = get_date_tag(*m, "TDAT")) &&
511 !(t = get_date_tag(*m, "TDA")))
513 snprintf(date + 4, sizeof(date) - 4, "-%.2s-%.2s", t->value + 2, t->value);
514 av_dict_set(m, "TDAT", NULL, 0);
515 av_dict_set(m, "TDA", NULL, 0);
517 if (!(t = get_date_tag(*m, "TIME")) &&
518 !(t = get_date_tag(*m, "TIM")))
520 snprintf(date + 10, sizeof(date) - 10,
521 " %.2s:%.2s", t->value, t->value + 2);
522 av_dict_set(m, "TIME", NULL, 0);
523 av_dict_set(m, "TIM", NULL, 0);
527 av_dict_set(m, "date", date, 0);
530 static void free_apic(void *obj)
532 ID3v2ExtraMetaAPIC *apic = obj;
533 av_buffer_unref(&apic->buf);
534 av_freep(&apic->description);
538 static void read_apic(AVFormatContext *s, AVIOContext *pb, int taglen,
539 char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
543 const CodecMime *mime = ff_id3v2_mime_tags;
544 enum AVCodecID id = AV_CODEC_ID_NONE;
545 ID3v2ExtraMetaAPIC *apic = NULL;
546 ID3v2ExtraMeta *new_extra = NULL;
547 int64_t end = avio_tell(pb) + taglen;
552 new_extra = av_mallocz(sizeof(*new_extra));
553 apic = av_mallocz(sizeof(*apic));
554 if (!new_extra || !apic)
562 taglen -= avio_get_str(pb, taglen, mimetype, sizeof(mimetype));
564 avio_read(pb, mimetype, 3);
567 while (mime->id != AV_CODEC_ID_NONE) {
568 if (!av_strncasecmp(mime->str, mimetype, sizeof(mimetype))) {
574 if (id == AV_CODEC_ID_NONE) {
575 av_log(s, AV_LOG_WARNING,
576 "Unknown attached picture mimetype: %s, skipping.\n", mimetype);
582 pic_type = avio_r8(pb);
584 if (pic_type < 0 || pic_type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types)) {
585 av_log(s, AV_LOG_WARNING, "Unknown attached picture type %d.\n",
589 apic->type = ff_id3v2_picture_types[pic_type];
591 /* description and picture data */
592 if (decode_str(s, pb, enc, &apic->description, &taglen) < 0) {
593 av_log(s, AV_LOG_ERROR,
594 "Error decoding attached picture description.\n");
598 apic->buf = av_buffer_alloc(taglen + FF_INPUT_BUFFER_PADDING_SIZE);
599 if (!apic->buf || !taglen || avio_read(pb, apic->buf->data, taglen) != taglen)
601 memset(apic->buf->data + taglen, 0, FF_INPUT_BUFFER_PADDING_SIZE);
603 new_extra->tag = "APIC";
604 new_extra->data = apic;
605 new_extra->next = *extra_meta;
606 *extra_meta = new_extra;
613 av_freep(&new_extra);
614 avio_seek(pb, end, SEEK_SET);
617 static void read_chapter(AVFormatContext *s, AVIOContext *pb, int len, char *ttag, ID3v2ExtraMeta **extra_meta, int isv34)
619 AVRational time_base = {1, 1000};
627 /* We should probably just put the chapter data to extra_meta here
628 * and do the AVFormatContext-needing part in a separate
629 * ff_id3v2_parse_apic()-like function. */
630 av_log(NULL, AV_LOG_DEBUG, "No AVFormatContext, skipped ID3 chapter data\n");
634 if (decode_str(s, pb, 0, &dst, &len) < 0)
639 start = avio_rb32(pb);
643 chapter = avpriv_new_chapter(s, s->nb_chapters + 1, time_base, start, end, dst);
651 if (avio_read(pb, tag, 4) < 4)
654 taglen = avio_rb32(pb);
657 if (taglen < 0 || taglen > len)
660 read_ttag(s, pb, taglen, &chapter->metadata, tag);
662 avio_skip(pb, taglen);
666 ff_metadata_conv(&chapter->metadata, NULL, ff_id3v2_34_metadata_conv);
667 ff_metadata_conv(&chapter->metadata, NULL, ff_id3v2_4_metadata_conv);
672 static void free_priv(void *obj)
674 ID3v2ExtraMetaPRIV *priv = obj;
675 av_freep(&priv->owner);
676 av_freep(&priv->data);
680 static void read_priv(AVFormatContext *s, AVIOContext *pb, int taglen,
681 char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
683 ID3v2ExtraMeta *meta;
684 ID3v2ExtraMetaPRIV *priv;
686 meta = av_mallocz(sizeof(*meta));
687 priv = av_mallocz(sizeof(*priv));
692 if (decode_str(s, pb, ID3v2_ENCODING_ISO8859, &priv->owner, &taglen) < 0)
695 priv->data = av_malloc(taglen);
699 priv->datasize = taglen;
701 if (avio_read(pb, priv->data, priv->datasize) != priv->datasize)
706 meta->next = *extra_meta;
717 typedef struct ID3v2EMFunc {
720 void (*read)(AVFormatContext *, AVIOContext *, int, char *,
721 ID3v2ExtraMeta **, int isv34);
722 void (*free)(void *obj);
725 static const ID3v2EMFunc id3v2_extra_meta_funcs[] = {
726 { "GEO", "GEOB", read_geobtag, free_geobtag },
727 { "PIC", "APIC", read_apic, free_apic },
728 { "CHAP","CHAP", read_chapter, NULL },
729 { "PRIV","PRIV", read_priv, free_priv },
734 * Get the corresponding ID3v2EMFunc struct for a tag.
735 * @param isv34 Determines if v2.2 or v2.3/4 strings are used
736 * @return A pointer to the ID3v2EMFunc struct if found, NULL otherwise.
738 static const ID3v2EMFunc *get_extra_meta_func(const char *tag, int isv34)
741 while (id3v2_extra_meta_funcs[i].tag3) {
742 if (tag && !memcmp(tag,
743 (isv34 ? id3v2_extra_meta_funcs[i].tag4 :
744 id3v2_extra_meta_funcs[i].tag3),
746 return &id3v2_extra_meta_funcs[i];
752 static void id3v2_parse(AVIOContext *pb, AVDictionary **metadata,
753 AVFormatContext *s, int len, uint8_t version,
754 uint8_t flags, ID3v2ExtraMeta **extra_meta)
759 int64_t next, end = avio_tell(pb) + len;
761 const char *reason = NULL;
762 AVIOContext pb_local;
764 unsigned char *buffer = NULL;
766 const ID3v2EMFunc *extra_func = NULL;
767 unsigned char *uncompressed_buffer = NULL;
768 av_unused int uncompressed_buffer_size = 0;
770 av_log(s, AV_LOG_DEBUG, "id3v2 ver:%d flags:%02X len:%d\n", version, flags, len);
775 reason = "compression";
793 unsync = flags & 0x80;
795 if (isv34 && flags & 0x40) { /* Extended header present, just skip over it */
796 int extlen = get_size(pb, 4);
798 /* In v2.4 the length includes the length field we just read. */
802 reason = "invalid extended header length";
805 avio_skip(pb, extlen);
808 reason = "extended header too long.";
813 while (len >= taghdrlen) {
814 unsigned int tflags = 0;
818 unsigned long av_unused dlen;
821 if (avio_read(pb, tag, 4) < 4)
825 tlen = avio_rb32(pb);
827 /* some encoders incorrectly uses v3 sizes instead of syncsafe ones
828 * so check the next tag to see which one to use */
829 tlen = avio_rb32(pb);
832 int64_t cur = avio_tell(pb);
834 if (ffio_ensure_seekback(pb, 2 /* tflags */ + tlen + 4 /* next tag */))
837 if (check_tag(pb, cur + 2 + size_to_syncsafe(tlen), 4) == 1)
838 tlen = size_to_syncsafe(tlen);
839 else if (check_tag(pb, cur + 2 + tlen, 4) != 1)
841 avio_seek(pb, cur, SEEK_SET);
843 tlen = size_to_syncsafe(tlen);
846 tflags = avio_rb16(pb);
847 tunsync = tflags & ID3v2_FLAG_UNSYNCH;
849 if (avio_read(pb, tag, 3) < 3)
852 tlen = avio_rb24(pb);
856 len -= taghdrlen + tlen;
861 next = avio_tell(pb) + tlen;
865 av_log(s, AV_LOG_DEBUG, "Invalid empty frame %s, skipping.\n",
870 if (tflags & ID3v2_FLAG_DATALEN) {
873 dlen = avio_rb32(pb);
878 tcomp = tflags & ID3v2_FLAG_COMPRESSION;
879 tencr = tflags & ID3v2_FLAG_ENCRYPTION;
881 /* skip encrypted tags and, if no zlib, compressed tags */
882 if (tencr || (!CONFIG_ZLIB && tcomp)) {
889 type = "encrypted and compressed";
891 av_log(s, AV_LOG_WARNING, "Skipping %s ID3v2 frame %s.\n", type, tag);
893 /* check for text tag or supported special meta tag */
894 } else if (tag[0] == 'T' ||
895 !memcmp(tag, "USLT", 4) ||
897 (extra_func = get_extra_meta_func(tag, isv34)))) {
900 if (unsync || tunsync || tcomp) {
901 av_fast_malloc(&buffer, &buffer_size, tlen);
903 av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", tlen);
907 if (unsync || tunsync) {
908 int64_t end = avio_tell(pb) + tlen;
912 while (avio_tell(pb) < end && b - buffer < tlen && !pb->eof_reached) {
914 if (*(b - 1) == 0xff && avio_tell(pb) < end - 1 &&
917 uint8_t val = avio_r8(pb);
918 *b++ = val ? val : avio_r8(pb);
921 ffio_init_context(&pb_local, buffer, b - buffer, 0, NULL, NULL, NULL,
924 pbx = &pb_local; // read from sync buffer
931 av_log(s, AV_LOG_DEBUG, "Compresssed frame %s tlen=%d dlen=%ld\n", tag, tlen, dlen);
933 av_fast_malloc(&uncompressed_buffer, &uncompressed_buffer_size, dlen);
934 if (!uncompressed_buffer) {
935 av_log(s, AV_LOG_ERROR, "Failed to alloc %ld bytes\n", dlen);
939 if (!(unsync || tunsync)) {
940 err = avio_read(pb, buffer, tlen);
942 av_log(s, AV_LOG_ERROR, "Failed to read compressed tag\n");
948 err = uncompress(uncompressed_buffer, &dlen, buffer, tlen);
950 av_log(s, AV_LOG_ERROR, "Failed to uncompress tag: %d\n", err);
953 ffio_init_context(&pb_local, uncompressed_buffer, dlen, 0, NULL, NULL, NULL, NULL);
955 pbx = &pb_local; // read from sync buffer
960 read_ttag(s, pbx, tlen, metadata, tag);
961 else if (!memcmp(tag, "USLT", 4))
962 read_uslt(s, pbx, tlen, metadata);
964 /* parse special meta tag */
965 extra_func->read(s, pbx, tlen, tag, extra_meta, isv34);
966 } else if (!tag[0]) {
968 av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding\n");
972 /* Skip to end of tag */
974 avio_seek(pb, next, SEEK_SET);
977 /* Footer preset, always 10 bytes, skip over it */
978 if (version == 4 && flags & 0x10)
983 av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n",
985 avio_seek(pb, end, SEEK_SET);
987 av_free(uncompressed_buffer);
991 static void id3v2_read_internal(AVIOContext *pb, AVDictionary **metadata,
992 AVFormatContext *s, const char *magic,
993 ID3v2ExtraMeta **extra_meta, int64_t max_search_size)
996 uint8_t buf[ID3v2_HEADER_SIZE];
1000 if (max_search_size && max_search_size < ID3v2_HEADER_SIZE)
1003 start = avio_tell(pb);
1005 /* save the current offset in case there's nothing to read/skip */
1006 off = avio_tell(pb);
1007 if (max_search_size && off - start >= max_search_size - ID3v2_HEADER_SIZE) {
1008 avio_seek(pb, off, SEEK_SET);
1012 ret = avio_read(pb, buf, ID3v2_HEADER_SIZE);
1013 if (ret != ID3v2_HEADER_SIZE) {
1014 avio_seek(pb, off, SEEK_SET);
1017 found_header = ff_id3v2_match(buf, magic);
1019 /* parse ID3v2 header */
1020 len = ((buf[6] & 0x7f) << 21) |
1021 ((buf[7] & 0x7f) << 14) |
1022 ((buf[8] & 0x7f) << 7) |
1024 id3v2_parse(pb, metadata, s, len, buf[3], buf[5], extra_meta);
1026 avio_seek(pb, off, SEEK_SET);
1028 } while (found_header);
1029 ff_metadata_conv(metadata, NULL, ff_id3v2_34_metadata_conv);
1030 ff_metadata_conv(metadata, NULL, id3v2_2_metadata_conv);
1031 ff_metadata_conv(metadata, NULL, ff_id3v2_4_metadata_conv);
1032 merge_date(metadata);
1035 void ff_id3v2_read_dict(AVIOContext *pb, AVDictionary **metadata,
1036 const char *magic, ID3v2ExtraMeta **extra_meta)
1038 id3v2_read_internal(pb, metadata, NULL, magic, extra_meta, 0);
1041 void ff_id3v2_read(AVFormatContext *s, const char *magic,
1042 ID3v2ExtraMeta **extra_meta, unsigned int max_search_size)
1044 id3v2_read_internal(s->pb, &s->metadata, s, magic, extra_meta, max_search_size);
1047 void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
1049 ID3v2ExtraMeta *current = *extra_meta, *next;
1050 const ID3v2EMFunc *extra_func;
1053 if ((extra_func = get_extra_meta_func(current->tag, 1)))
1054 extra_func->free(current->data);
1055 next = current->next;
1063 int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
1065 ID3v2ExtraMeta *cur;
1067 for (cur = *extra_meta; cur; cur = cur->next) {
1068 ID3v2ExtraMetaAPIC *apic;
1071 if (strcmp(cur->tag, "APIC"))
1075 if (!(st = avformat_new_stream(s, NULL)))
1076 return AVERROR(ENOMEM);
1078 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
1079 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1080 st->codec->codec_id = apic->id;
1081 av_dict_set(&st->metadata, "title", apic->description, 0);
1082 av_dict_set(&st->metadata, "comment", apic->type, 0);
1084 av_init_packet(&st->attached_pic);
1085 st->attached_pic.buf = apic->buf;
1086 st->attached_pic.data = apic->buf->data;
1087 st->attached_pic.size = apic->buf->size - FF_INPUT_BUFFER_PADDING_SIZE;
1088 st->attached_pic.stream_index = st->index;
1089 st->attached_pic.flags |= AV_PKT_FLAG_KEY;