/* * 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 "config.h" #if CONFIG_ZLIB #include <zlib.h> #endif #include "libavutil/avstring.h" #include "libavutil/dict.h" #include "libavutil/intreadwrite.h" #include "avio_internal.h" #include "internal.h" #include "id3v1.h" #include "id3v2.h" 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" }, { "USLT", "lyrics" }, { 0 } }; const AVMetadataConv ff_id3v2_4_metadata_conv[] = { { "TCMP", "compilation" }, { "TDRC", "date" }, { "TDRL", "date" }, { "TDEN", "creation_time" }, { "TSOA", "album-sort" }, { "TSOP", "artist-sort" }, { "TSOT", "title-sort" }, { 0 } }; static const AVMetadataConv id3v2_2_metadata_conv[] = { { "TAL", "album" }, { "TCO", "genre" }, { "TCP", "compilation" }, { "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 }, }; const char * const ff_id3v2_picture_types[21] = { "Other", "32x32 pixels 'file icon'", "Other file icon", "Cover (front)", "Cover (back)", "Leaflet page", "Media (e.g. label side of CD)", "Lead artist/lead performer/soloist", "Artist/performer", "Conductor", "Band/Orchestra", "Composer", "Lyricist/text writer", "Recording Location", "During recording", "During performance", "Movie/video screen capture", "A bright coloured fish", "Illustration", "Band/artist logotype", "Publisher/Studio logotype", }; const CodecMime ff_id3v2_mime_tags[] = { { "image/gif", AV_CODEC_ID_GIF }, { "image/jpeg", AV_CODEC_ID_MJPEG }, { "image/jpg", AV_CODEC_ID_MJPEG }, { "image/png", AV_CODEC_ID_PNG }, { "image/tiff", AV_CODEC_ID_TIFF }, { "image/bmp", AV_CODEC_ID_BMP }, { "JPG", AV_CODEC_ID_MJPEG }, /* ID3v2.2 */ { "PNG", AV_CODEC_ID_PNG }, /* ID3v2.2 */ { "", AV_CODEC_ID_NONE }, }; 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 unsigned int size_to_syncsafe(unsigned int size) { return (((size) & (0x7f << 0)) >> 0) + (((size) & (0x7f << 8)) >> 1) + (((size) & (0x7f << 16)) >> 2) + (((size) & (0x7f << 24)) >> 3); } /* No real verification, only check that the tag consists of * a combination of capital alpha-numerical characters */ static int is_tag(const char *buf, unsigned int len) { if (!len) return 0; while (len--) if ((buf[len] < 'A' || buf[len] > 'Z') && (buf[len] < '0' || buf[len] > '9')) return 0; return 1; } /** * Return 1 if the tag of length len at the given offset is valid, 0 if not, -1 on error */ static int check_tag(AVIOContext *s, int offset, unsigned int len) { char tag[4]; if (len > 4 || avio_seek(s, offset, SEEK_SET) < 0 || avio_read(s, tag, len) < (int)len) return -1; else if (!AV_RB32(tag) || is_tag(tag, len)) return 1; return 0; } /** * Free GEOB type extra metadata. */ static void free_geobtag(void *obj) { ID3v2ExtraMetaGEOB *geob = obj; av_freep(&geob->mime_type); av_freep(&geob->file_name); av_freep(&geob->description); av_freep(&geob->data); av_free(geob); } /** * Decode characters to UTF-8 according to encoding type. The decoded buffer is * always null terminated. Stop reading when either *maxread bytes are read from * pb or U+0000 character is found. * * @param dst Pointer where the address of the buffer with the decoded bytes is * stored. Buffer must be freed by caller. * @param maxread Pointer to maximum number of characters to read from the * AVIOContext. After execution the value is decremented by the number of bytes * actually read. * @returns 0 if no error occurred, dst is uninitialized on error */ static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding, uint8_t **dst, int *maxread) { int ret; uint8_t tmp; uint32_t ch = 1; int left = *maxread; unsigned int (*get)(AVIOContext*) = avio_rb16; AVIOContext *dynbuf; if ((ret = avio_open_dyn_buf(&dynbuf)) < 0) { av_log(s, AV_LOG_ERROR, "Error opening memory stream\n"); return ret; } switch (encoding) { case ID3v2_ENCODING_ISO8859: while (left && ch) { ch = avio_r8(pb); PUT_UTF8(ch, tmp, avio_w8(dynbuf, tmp);) left--; } break; case ID3v2_ENCODING_UTF16BOM: if ((left -= 2) < 0) { av_log(s, AV_LOG_ERROR, "Cannot read BOM value, input too short\n"); ffio_free_dyn_buf(&dynbuf); *dst = NULL; return AVERROR_INVALIDDATA; } switch (avio_rb16(pb)) { case 0xfffe: get = avio_rl16; case 0xfeff: break; default: av_log(s, AV_LOG_ERROR, "Incorrect BOM value\n"); ffio_free_dyn_buf(&dynbuf); *dst = NULL; *maxread = left; return AVERROR_INVALIDDATA; } // fall-through case ID3v2_ENCODING_UTF16BE: while ((left > 1) && ch) { GET_UTF16(ch, ((left -= 2) >= 0 ? get(pb) : 0), break;) PUT_UTF8(ch, tmp, avio_w8(dynbuf, tmp);) } if (left < 0) left += 2; /* did not read last char from pb */ break; case ID3v2_ENCODING_UTF8: while (left && ch) { ch = avio_r8(pb); avio_w8(dynbuf, ch); left--; } break; default: av_log(s, AV_LOG_WARNING, "Unknown encoding\n"); } if (ch) avio_w8(dynbuf, 0); avio_close_dyn_buf(dynbuf, dst); *maxread = left; return 0; } /** * Parse a text tag. */ static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen, AVDictionary **metadata, const char *key) { uint8_t *dst; int encoding, dict_flags = AV_DICT_DONT_OVERWRITE | AV_DICT_DONT_STRDUP_VAL; unsigned genre; if (taglen < 1) return; encoding = avio_r8(pb); taglen--; /* account for encoding type byte */ if (decode_str(s, pb, encoding, &dst, &taglen) < 0) { av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", key); return; } if (!(strcmp(key, "TCON") && strcmp(key, "TCO")) && (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1) && genre <= ID3v1_GENRE_MAX) { av_freep(&dst); dst = av_strdup(ff_id3v1_genre_str[genre]); } else if (!(strcmp(key, "TXXX") && strcmp(key, "TXX"))) { /* dst now contains the key, need to get value */ key = dst; if (decode_str(s, pb, encoding, &dst, &taglen) < 0) { av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", key); av_freep(&key); return; } dict_flags |= AV_DICT_DONT_STRDUP_KEY; } else if (!*dst) av_freep(&dst); if (dst) av_dict_set(metadata, key, dst, dict_flags); } static void read_uslt(AVFormatContext *s, AVIOContext *pb, int taglen, AVDictionary **metadata) { uint8_t lang[4]; uint8_t *descriptor = NULL; // 'Content descriptor' uint8_t *text = NULL; char *key = NULL; int encoding; int ok = 0; if (taglen < 1) goto error; encoding = avio_r8(pb); taglen--; if (avio_read(pb, lang, 3) < 3) goto error; lang[3] = '\0'; taglen -= 3; if (decode_str(s, pb, encoding, &descriptor, &taglen) < 0) goto error; if (decode_str(s, pb, encoding, &text, &taglen) < 0) goto error; // FFmpeg does not support hierarchical metadata, so concatenate the keys. key = av_asprintf("lyrics-%s%s%s", descriptor[0] ? (char *)descriptor : "", descriptor[0] ? "-" : "", lang); if (!key) goto error; av_dict_set(metadata, key, text, 0); ok = 1; error: if (!ok) av_log(s, AV_LOG_ERROR, "Error reading lyrics, skipped\n"); av_free(descriptor); av_free(text); av_free(key); } /** * Parse a comment tag. */ static void read_comment(AVFormatContext *s, AVIOContext *pb, int taglen, AVDictionary **metadata) { const char *key = "comment"; uint8_t *dst; int encoding, dict_flags = AV_DICT_DONT_OVERWRITE | AV_DICT_DONT_STRDUP_VAL; av_unused int language; if (taglen < 4) return; encoding = avio_r8(pb); language = avio_rl24(pb); taglen -= 4; if (decode_str(s, pb, encoding, &dst, &taglen) < 0) { av_log(s, AV_LOG_ERROR, "Error reading comment frame, skipped\n"); return; } if (dst && !*dst) av_freep(&dst); if (dst) { key = (const char *) dst; dict_flags |= AV_DICT_DONT_STRDUP_KEY; } if (decode_str(s, pb, encoding, &dst, &taglen) < 0) { av_log(s, AV_LOG_ERROR, "Error reading comment frame, skipped\n"); if (dict_flags & AV_DICT_DONT_STRDUP_KEY) av_freep((void*)&key); return; } if (dst) av_dict_set(metadata, key, (const char *) dst, dict_flags); } /** * Parse GEOB tag into a ID3v2ExtraMetaGEOB struct. */ static void read_geobtag(AVFormatContext *s, AVIOContext *pb, int taglen, const char *tag, ID3v2ExtraMeta **extra_meta, int isv34) { ID3v2ExtraMetaGEOB *geob_data = NULL; ID3v2ExtraMeta *new_extra = NULL; char encoding; unsigned int len; if (taglen < 1) return; geob_data = av_mallocz(sizeof(ID3v2ExtraMetaGEOB)); if (!geob_data) { av_log(s, AV_LOG_ERROR, "Failed to alloc %"SIZE_SPECIFIER" bytes\n", sizeof(ID3v2ExtraMetaGEOB)); return; } new_extra = av_mallocz(sizeof(ID3v2ExtraMeta)); if (!new_extra) { av_log(s, AV_LOG_ERROR, "Failed to alloc %"SIZE_SPECIFIER" bytes\n", sizeof(ID3v2ExtraMeta)); goto fail; } /* read encoding type byte */ encoding = avio_r8(pb); taglen--; /* read MIME type (always ISO-8859) */ if (decode_str(s, pb, ID3v2_ENCODING_ISO8859, &geob_data->mime_type, &taglen) < 0 || taglen <= 0) goto fail; /* read file name */ if (decode_str(s, pb, encoding, &geob_data->file_name, &taglen) < 0 || taglen <= 0) goto fail; /* read content description */ if (decode_str(s, pb, encoding, &geob_data->description, &taglen) < 0 || taglen < 0) goto fail; if (taglen) { /* save encapsulated binary data */ geob_data->data = av_malloc(taglen); if (!geob_data->data) { av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", taglen); goto fail; } if ((len = avio_read(pb, geob_data->data, taglen)) < taglen) av_log(s, AV_LOG_WARNING, "Error reading GEOB frame, data truncated.\n"); geob_data->datasize = len; } else { geob_data->data = NULL; geob_data->datasize = 0; } /* add data to the list */ new_extra->tag = "GEOB"; new_extra->data = geob_data; new_extra->next = *extra_meta; *extra_meta = new_extra; return; fail: av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", tag); free_geobtag(geob_data); av_free(new_extra); return; } 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 free_apic(void *obj) { ID3v2ExtraMetaAPIC *apic = obj; av_buffer_unref(&apic->buf); av_freep(&apic->description); av_freep(&apic); } static void rstrip_spaces(char *buf) { size_t len = strlen(buf); while (len > 0 && buf[len - 1] == ' ') buf[--len] = 0; } static void read_apic(AVFormatContext *s, AVIOContext *pb, int taglen, const char *tag, ID3v2ExtraMeta **extra_meta, int isv34) { int enc, pic_type; char mimetype[64]; const CodecMime *mime = ff_id3v2_mime_tags; enum AVCodecID id = AV_CODEC_ID_NONE; ID3v2ExtraMetaAPIC *apic = NULL; ID3v2ExtraMeta *new_extra = NULL; int64_t end = avio_tell(pb) + taglen; if (taglen <= 4 || (!isv34 && taglen <= 6)) goto fail; new_extra = av_mallocz(sizeof(*new_extra)); apic = av_mallocz(sizeof(*apic)); if (!new_extra || !apic) goto fail; enc = avio_r8(pb); taglen--; /* mimetype */ if (isv34) { taglen -= avio_get_str(pb, taglen, mimetype, sizeof(mimetype)); } else { avio_read(pb, mimetype, 3); mimetype[3] = 0; taglen -= 3; } while (mime->id != AV_CODEC_ID_NONE) { if (!av_strncasecmp(mime->str, mimetype, sizeof(mimetype))) { id = mime->id; break; } mime++; } if (id == AV_CODEC_ID_NONE) { av_log(s, AV_LOG_WARNING, "Unknown attached picture mimetype: %s, skipping.\n", mimetype); goto fail; } apic->id = id; /* picture type */ pic_type = avio_r8(pb); taglen--; if (pic_type < 0 || pic_type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types)) { av_log(s, AV_LOG_WARNING, "Unknown attached picture type %d.\n", pic_type); pic_type = 0; } apic->type = ff_id3v2_picture_types[pic_type]; /* description and picture data */ if (decode_str(s, pb, enc, &apic->description, &taglen) < 0) { av_log(s, AV_LOG_ERROR, "Error decoding attached picture description.\n"); goto fail; } apic->buf = av_buffer_alloc(taglen + AV_INPUT_BUFFER_PADDING_SIZE); if (!apic->buf || !taglen || avio_read(pb, apic->buf->data, taglen) != taglen) goto fail; memset(apic->buf->data + taglen, 0, AV_INPUT_BUFFER_PADDING_SIZE); new_extra->tag = "APIC"; new_extra->data = apic; new_extra->next = *extra_meta; *extra_meta = new_extra; // The description must be unique, and some ID3v2 tag writers add spaces // to write several APIC entries with the same description. rstrip_spaces(apic->description); return; fail: if (apic) free_apic(apic); av_freep(&new_extra); avio_seek(pb, end, SEEK_SET); } static void free_chapter(void *obj) { ID3v2ExtraMetaCHAP *chap = obj; av_freep(&chap->element_id); av_dict_free(&chap->meta); av_freep(&chap); } static void read_chapter(AVFormatContext *s, AVIOContext *pb, int len, const char *ttag, ID3v2ExtraMeta **extra_meta, int isv34) { int taglen; char tag[5]; ID3v2ExtraMeta *new_extra = NULL; ID3v2ExtraMetaCHAP *chap = NULL; new_extra = av_mallocz(sizeof(*new_extra)); chap = av_mallocz(sizeof(*chap)); if (!new_extra || !chap) goto fail; if (decode_str(s, pb, 0, &chap->element_id, &len) < 0) goto fail; if (len < 16) goto fail; chap->start = avio_rb32(pb); chap->end = avio_rb32(pb); avio_skip(pb, 8); len -= 16; while (len > 10) { if (avio_read(pb, tag, 4) < 4) goto fail; tag[4] = 0; taglen = avio_rb32(pb); avio_skip(pb, 2); len -= 10; if (taglen < 0 || taglen > len) goto fail; if (tag[0] == 'T') read_ttag(s, pb, taglen, &chap->meta, tag); else avio_skip(pb, taglen); len -= taglen; } ff_metadata_conv(&chap->meta, NULL, ff_id3v2_34_metadata_conv); ff_metadata_conv(&chap->meta, NULL, ff_id3v2_4_metadata_conv); new_extra->tag = "CHAP"; new_extra->data = chap; new_extra->next = *extra_meta; *extra_meta = new_extra; return; fail: if (chap) free_chapter(chap); av_freep(&new_extra); } static void free_priv(void *obj) { ID3v2ExtraMetaPRIV *priv = obj; av_freep(&priv->owner); av_freep(&priv->data); av_freep(&priv); } static void read_priv(AVFormatContext *s, AVIOContext *pb, int taglen, const char *tag, ID3v2ExtraMeta **extra_meta, int isv34) { ID3v2ExtraMeta *meta; ID3v2ExtraMetaPRIV *priv; meta = av_mallocz(sizeof(*meta)); priv = av_mallocz(sizeof(*priv)); if (!meta || !priv) goto fail; if (decode_str(s, pb, ID3v2_ENCODING_ISO8859, &priv->owner, &taglen) < 0) goto fail; priv->data = av_malloc(taglen); if (!priv->data) goto fail; priv->datasize = taglen; if (avio_read(pb, priv->data, priv->datasize) != priv->datasize) goto fail; meta->tag = "PRIV"; meta->data = priv; meta->next = *extra_meta; *extra_meta = meta; return; fail: if (priv) free_priv(priv); av_freep(&meta); } typedef struct ID3v2EMFunc { const char *tag3; const char *tag4; void (*read)(AVFormatContext *s, AVIOContext *pb, int taglen, const char *tag, ID3v2ExtraMeta **extra_meta, int isv34); void (*free)(void *obj); } ID3v2EMFunc; static const ID3v2EMFunc id3v2_extra_meta_funcs[] = { { "GEO", "GEOB", read_geobtag, free_geobtag }, { "PIC", "APIC", read_apic, free_apic }, { "CHAP","CHAP", read_chapter, free_chapter }, { "PRIV","PRIV", read_priv, free_priv }, { NULL } }; /** * Get the corresponding ID3v2EMFunc struct for a tag. * @param isv34 Determines if v2.2 or v2.3/4 strings are used * @return A pointer to the ID3v2EMFunc struct if found, NULL otherwise. */ static const ID3v2EMFunc *get_extra_meta_func(const char *tag, int isv34) { int i = 0; while (id3v2_extra_meta_funcs[i].tag3) { if (tag && !memcmp(tag, (isv34 ? id3v2_extra_meta_funcs[i].tag4 : id3v2_extra_meta_funcs[i].tag3), (isv34 ? 4 : 3))) return &id3v2_extra_meta_funcs[i]; i++; } return NULL; } static void id3v2_parse(AVIOContext *pb, AVDictionary **metadata, AVFormatContext *s, int len, uint8_t version, uint8_t flags, ID3v2ExtraMeta **extra_meta) { int isv34, unsync; unsigned tlen; char tag[5]; int64_t next, end = avio_tell(pb) + len; int taghdrlen; const char *reason = NULL; AVIOContext pb_local; AVIOContext *pbx; unsigned char *buffer = NULL; int buffer_size = 0; const ID3v2EMFunc *extra_func = NULL; unsigned char *uncompressed_buffer = NULL; av_unused int uncompressed_buffer_size = 0; const char *comm_frame; av_log(s, AV_LOG_DEBUG, "id3v2 ver:%d flags:%02X len:%d\n", version, flags, len); switch (version) { case 2: if (flags & 0x40) { reason = "compression"; goto error; } isv34 = 0; taghdrlen = 6; comm_frame = "COM"; break; case 3: case 4: isv34 = 1; taghdrlen = 10; comm_frame = "COMM"; break; default: reason = "version"; goto error; } unsync = flags & 0x80; if (isv34 && flags & 0x40) { /* Extended header present, just skip over it */ int extlen = get_size(pb, 4); if (version == 4) /* In v2.4 the length includes the length field we just read. */ extlen -= 4; if (extlen < 0) { reason = "invalid extended header length"; goto error; } avio_skip(pb, extlen); len -= extlen + 4; if (len < 0) { reason = "extended header too long."; goto error; } } while (len >= taghdrlen) { unsigned int tflags = 0; int tunsync = 0; int tcomp = 0; int tencr = 0; unsigned long av_unused dlen; if (isv34) { if (avio_read(pb, tag, 4) < 4) break; tag[4] = 0; if (version == 3) { tlen = avio_rb32(pb); } else { /* some encoders incorrectly uses v3 sizes instead of syncsafe ones * so check the next tag to see which one to use */ tlen = avio_rb32(pb); if (tlen > 0x7f) { if (tlen < len) { int64_t cur = avio_tell(pb); if (ffio_ensure_seekback(pb, 2 /* tflags */ + tlen + 4 /* next tag */)) break; if (check_tag(pb, cur + 2 + size_to_syncsafe(tlen), 4) == 1) tlen = size_to_syncsafe(tlen); else if (check_tag(pb, cur + 2 + tlen, 4) != 1) break; avio_seek(pb, cur, SEEK_SET); } else tlen = size_to_syncsafe(tlen); } } tflags = avio_rb16(pb); tunsync = tflags & ID3v2_FLAG_UNSYNCH; } else { if (avio_read(pb, tag, 3) < 3) break; tag[3] = 0; tlen = avio_rb24(pb); } if (tlen > (1<<28)) break; len -= taghdrlen + tlen; if (len < 0) break; next = avio_tell(pb) + tlen; if (!tlen) { if (tag[0]) av_log(s, AV_LOG_DEBUG, "Invalid empty frame %s, skipping.\n", tag); continue; } if (tflags & ID3v2_FLAG_DATALEN) { if (tlen < 4) break; dlen = avio_rb32(pb); tlen -= 4; } else dlen = tlen; tcomp = tflags & ID3v2_FLAG_COMPRESSION; tencr = tflags & ID3v2_FLAG_ENCRYPTION; /* skip encrypted tags and, if no zlib, compressed tags */ if (tencr || (!CONFIG_ZLIB && tcomp)) { const char *type; if (!tcomp) type = "encrypted"; else if (!tencr) type = "compressed"; else type = "encrypted and compressed"; av_log(s, AV_LOG_WARNING, "Skipping %s ID3v2 frame %s.\n", type, tag); avio_skip(pb, tlen); /* check for text tag or supported special meta tag */ } else if (tag[0] == 'T' || !memcmp(tag, "USLT", 4) || !strcmp(tag, comm_frame) || (extra_meta && (extra_func = get_extra_meta_func(tag, isv34)))) { pbx = pb; if (unsync || tunsync || tcomp) { av_fast_malloc(&buffer, &buffer_size, tlen); if (!buffer) { av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", tlen); goto seek; } } if (unsync || tunsync) { int64_t end = avio_tell(pb) + tlen; uint8_t *b; b = buffer; while (avio_tell(pb) < end && b - buffer < tlen && !pb->eof_reached) { *b++ = avio_r8(pb); if (*(b - 1) == 0xff && avio_tell(pb) < end - 1 && b - buffer < tlen && !pb->eof_reached ) { uint8_t val = avio_r8(pb); *b++ = val ? val : avio_r8(pb); } } ffio_init_context(&pb_local, buffer, b - buffer, 0, NULL, NULL, NULL, NULL); tlen = b - buffer; pbx = &pb_local; // read from sync buffer } #if CONFIG_ZLIB if (tcomp) { int err; av_log(s, AV_LOG_DEBUG, "Compresssed frame %s tlen=%d dlen=%ld\n", tag, tlen, dlen); av_fast_malloc(&uncompressed_buffer, &uncompressed_buffer_size, dlen); if (!uncompressed_buffer) { av_log(s, AV_LOG_ERROR, "Failed to alloc %ld bytes\n", dlen); goto seek; } if (!(unsync || tunsync)) { err = avio_read(pb, buffer, tlen); if (err < 0) { av_log(s, AV_LOG_ERROR, "Failed to read compressed tag\n"); goto seek; } tlen = err; } err = uncompress(uncompressed_buffer, &dlen, buffer, tlen); if (err != Z_OK) { av_log(s, AV_LOG_ERROR, "Failed to uncompress tag: %d\n", err); goto seek; } ffio_init_context(&pb_local, uncompressed_buffer, dlen, 0, NULL, NULL, NULL, NULL); tlen = dlen; pbx = &pb_local; // read from sync buffer } #endif if (tag[0] == 'T') /* parse text tag */ read_ttag(s, pbx, tlen, metadata, tag); else if (!memcmp(tag, "USLT", 4)) read_uslt(s, pbx, tlen, metadata); else if (!strcmp(tag, comm_frame)) read_comment(s, pbx, tlen, metadata); else /* parse special meta tag */ extra_func->read(s, pbx, tlen, tag, extra_meta, isv34); } else if (!tag[0]) { if (tag[1]) av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding\n"); avio_skip(pb, tlen); break; } /* Skip to end of tag */ seek: avio_seek(pb, next, SEEK_SET); } /* Footer preset, always 10 bytes, skip over it */ if (version == 4 && flags & 0x10) end += 10; error: if (reason) av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason); avio_seek(pb, end, SEEK_SET); av_free(buffer); av_free(uncompressed_buffer); return; } static void id3v2_read_internal(AVIOContext *pb, AVDictionary **metadata, AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta, int64_t max_search_size) { int len, ret; uint8_t buf[ID3v2_HEADER_SIZE]; int found_header; int64_t start, off; if (max_search_size && max_search_size < ID3v2_HEADER_SIZE) return; start = avio_tell(pb); do { /* save the current offset in case there's nothing to read/skip */ off = avio_tell(pb); if (max_search_size && off - start >= max_search_size - ID3v2_HEADER_SIZE) { avio_seek(pb, off, SEEK_SET); break; } ret = ffio_ensure_seekback(pb, ID3v2_HEADER_SIZE); if (ret >= 0) ret = avio_read(pb, buf, ID3v2_HEADER_SIZE); if (ret != ID3v2_HEADER_SIZE) { avio_seek(pb, off, SEEK_SET); 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); id3v2_parse(pb, metadata, s, len, buf[3], buf[5], extra_meta); } else { avio_seek(pb, off, SEEK_SET); } } while (found_header); ff_metadata_conv(metadata, NULL, ff_id3v2_34_metadata_conv); ff_metadata_conv(metadata, NULL, id3v2_2_metadata_conv); ff_metadata_conv(metadata, NULL, ff_id3v2_4_metadata_conv); merge_date(metadata); } void ff_id3v2_read_dict(AVIOContext *pb, AVDictionary **metadata, const char *magic, ID3v2ExtraMeta **extra_meta) { id3v2_read_internal(pb, metadata, NULL, magic, extra_meta, 0); } void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta, unsigned int max_search_size) { id3v2_read_internal(s->pb, &s->metadata, s, magic, extra_meta, max_search_size); } void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta) { ID3v2ExtraMeta *current = *extra_meta, *next; const ID3v2EMFunc *extra_func; while (current) { if ((extra_func = get_extra_meta_func(current->tag, 1))) extra_func->free(current->data); next = current->next; av_freep(¤t); current = next; } *extra_meta = NULL; } int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta **extra_meta) { ID3v2ExtraMeta *cur; for (cur = *extra_meta; cur; cur = cur->next) { ID3v2ExtraMetaAPIC *apic; AVStream *st; if (strcmp(cur->tag, "APIC")) continue; apic = cur->data; if (!(st = avformat_new_stream(s, NULL))) return AVERROR(ENOMEM); st->disposition |= AV_DISPOSITION_ATTACHED_PIC; st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = apic->id; if (AV_RB64(apic->buf->data) == 0x89504e470d0a1a0a) st->codecpar->codec_id = AV_CODEC_ID_PNG; if (apic->description[0]) av_dict_set(&st->metadata, "title", apic->description, 0); av_dict_set(&st->metadata, "comment", apic->type, 0); av_init_packet(&st->attached_pic); st->attached_pic.buf = apic->buf; st->attached_pic.data = apic->buf->data; st->attached_pic.size = apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE; st->attached_pic.stream_index = st->index; st->attached_pic.flags |= AV_PKT_FLAG_KEY; apic->buf = NULL; } return 0; } int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta **extra_meta) { int ret = 0; ID3v2ExtraMeta *cur; AVRational time_base = {1, 1000}; ID3v2ExtraMetaCHAP **chapters = NULL; int num_chapters = 0; int i; // since extra_meta is a linked list where elements are prepended, // we need to reverse the order of chapters for (cur = *extra_meta; cur; cur = cur->next) { ID3v2ExtraMetaCHAP *chap; if (strcmp(cur->tag, "CHAP")) continue; chap = cur->data; if ((ret = av_dynarray_add_nofree(&chapters, &num_chapters, chap)) < 0) goto end; } for (i = 0; i < (num_chapters / 2); i++) { ID3v2ExtraMetaCHAP *right; int right_index; right_index = (num_chapters - 1) - i; right = chapters[right_index]; chapters[right_index] = chapters[i]; chapters[i] = right; } for (i = 0; i < num_chapters; i++) { ID3v2ExtraMetaCHAP *chap; AVChapter *chapter; chap = chapters[i]; chapter = avpriv_new_chapter(s, i, time_base, chap->start, chap->end, chap->element_id); if (!chapter) continue; if ((ret = av_dict_copy(&chapter->metadata, chap->meta, 0)) < 0) goto end; } end: av_freep(&chapters); return ret; }