yading@11: /*
yading@11:  * Copyright (c) 2003 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * ID3v2 header parser
yading@11:  *
yading@11:  * Specifications available at:
yading@11:  * http://id3.org/Developer_Information
yading@11:  */
yading@11: 
yading@11: #include "config.h"
yading@11: 
yading@11: #if CONFIG_ZLIB
yading@11: #include <zlib.h>
yading@11: #endif
yading@11: 
yading@11: #include "id3v2.h"
yading@11: #include "id3v1.h"
yading@11: #include "libavutil/avstring.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/dict.h"
yading@11: #include "avio_internal.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: const AVMetadataConv ff_id3v2_34_metadata_conv[] = {
yading@11:     { "TALB", "album"},
yading@11:     { "TCOM", "composer"},
yading@11:     { "TCON", "genre"},
yading@11:     { "TCOP", "copyright"},
yading@11:     { "TENC", "encoded_by"},
yading@11:     { "TIT2", "title"},
yading@11:     { "TLAN", "language"},
yading@11:     { "TPE1", "artist"},
yading@11:     { "TPE2", "album_artist"},
yading@11:     { "TPE3", "performer"},
yading@11:     { "TPOS", "disc"},
yading@11:     { "TPUB", "publisher"},
yading@11:     { "TRCK", "track"},
yading@11:     { "TSSE", "encoder"},
yading@11:     { 0 }
yading@11: };
yading@11: 
yading@11: const AVMetadataConv ff_id3v2_4_metadata_conv[] = {
yading@11:     { "TDRL", "date"},
yading@11:     { "TDRC", "date"},
yading@11:     { "TDEN", "creation_time"},
yading@11:     { "TSOA", "album-sort"},
yading@11:     { "TSOP", "artist-sort"},
yading@11:     { "TSOT", "title-sort"},
yading@11:     { 0 }
yading@11: };
yading@11: 
yading@11: static const AVMetadataConv id3v2_2_metadata_conv[] = {
yading@11:     { "TAL",  "album"},
yading@11:     { "TCO",  "genre"},
yading@11:     { "TT2",  "title"},
yading@11:     { "TEN",  "encoded_by"},
yading@11:     { "TP1",  "artist"},
yading@11:     { "TP2",  "album_artist"},
yading@11:     { "TP3",  "performer"},
yading@11:     { "TRK",  "track"},
yading@11:     { 0 }
yading@11: };
yading@11: 
yading@11: 
yading@11: const char ff_id3v2_tags[][4] = {
yading@11:    "TALB", "TBPM", "TCOM", "TCON", "TCOP", "TDLY", "TENC", "TEXT",
yading@11:    "TFLT", "TIT1", "TIT2", "TIT3", "TKEY", "TLAN", "TLEN", "TMED",
yading@11:    "TOAL", "TOFN", "TOLY", "TOPE", "TOWN", "TPE1", "TPE2", "TPE3",
yading@11:    "TPE4", "TPOS", "TPUB", "TRCK", "TRSN", "TRSO", "TSRC", "TSSE",
yading@11:    { 0 },
yading@11: };
yading@11: 
yading@11: const char ff_id3v2_4_tags[][4] = {
yading@11:    "TDEN", "TDOR", "TDRC", "TDRL", "TDTG", "TIPL", "TMCL", "TMOO",
yading@11:    "TPRO", "TSOA", "TSOP", "TSOT", "TSST",
yading@11:    { 0 },
yading@11: };
yading@11: 
yading@11: const char ff_id3v2_3_tags[][4] = {
yading@11:    "TDAT", "TIME", "TORY", "TRDA", "TSIZ", "TYER",
yading@11:    { 0 },
yading@11: };
yading@11: 
yading@11: const char *ff_id3v2_picture_types[21] = {
yading@11:     "Other",
yading@11:     "32x32 pixels 'file icon'",
yading@11:     "Other file icon",
yading@11:     "Cover (front)",
yading@11:     "Cover (back)",
yading@11:     "Leaflet page",
yading@11:     "Media (e.g. label side of CD)",
yading@11:     "Lead artist/lead performer/soloist",
yading@11:     "Artist/performer",
yading@11:     "Conductor",
yading@11:     "Band/Orchestra",
yading@11:     "Composer",
yading@11:     "Lyricist/text writer",
yading@11:     "Recording Location",
yading@11:     "During recording",
yading@11:     "During performance",
yading@11:     "Movie/video screen capture",
yading@11:     "A bright coloured fish",
yading@11:     "Illustration",
yading@11:     "Band/artist logotype",
yading@11:     "Publisher/Studio logotype",
yading@11: };
yading@11: 
yading@11: const CodecMime ff_id3v2_mime_tags[] = {
yading@11:     {"image/gif" , AV_CODEC_ID_GIF},
yading@11:     {"image/jpeg", AV_CODEC_ID_MJPEG},
yading@11:     {"image/jpg",  AV_CODEC_ID_MJPEG},
yading@11:     {"image/png" , AV_CODEC_ID_PNG},
yading@11:     {"image/tiff", AV_CODEC_ID_TIFF},
yading@11:     {"image/bmp",  AV_CODEC_ID_BMP},
yading@11:     {"JPG",        AV_CODEC_ID_MJPEG}, /* ID3v2.2  */
yading@11:     {"PNG" ,       AV_CODEC_ID_PNG},   /* ID3v2.2  */
yading@11:     {"",           AV_CODEC_ID_NONE},
yading@11: };
yading@11: 
yading@11: int ff_id3v2_match(const uint8_t *buf, const char * magic)
yading@11: {
yading@11:     return  buf[0]         == magic[0] &&
yading@11:             buf[1]         == magic[1] &&
yading@11:             buf[2]         == magic[2] &&
yading@11:             buf[3]         != 0xff &&
yading@11:             buf[4]         != 0xff &&
yading@11:            (buf[6] & 0x80) ==    0 &&
yading@11:            (buf[7] & 0x80) ==    0 &&
yading@11:            (buf[8] & 0x80) ==    0 &&
yading@11:            (buf[9] & 0x80) ==    0;
yading@11: }
yading@11: 
yading@11: int ff_id3v2_tag_len(const uint8_t * buf)
yading@11: {
yading@11:     int len = ((buf[6] & 0x7f) << 21) +
yading@11:               ((buf[7] & 0x7f) << 14) +
yading@11:               ((buf[8] & 0x7f) << 7) +
yading@11:                (buf[9] & 0x7f) +
yading@11:               ID3v2_HEADER_SIZE;
yading@11:     if (buf[5] & 0x10)
yading@11:         len += ID3v2_HEADER_SIZE;
yading@11:     return len;
yading@11: }
yading@11: 
yading@11: static unsigned int get_size(AVIOContext *s, int len)
yading@11: {
yading@11:     int v = 0;
yading@11:     while (len--)
yading@11:         v = (v << 7) + (avio_r8(s) & 0x7F);
yading@11:     return v;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Free GEOB type extra metadata.
yading@11:  */
yading@11: static void free_geobtag(void *obj)
yading@11: {
yading@11:     ID3v2ExtraMetaGEOB *geob = obj;
yading@11:     av_free(geob->mime_type);
yading@11:     av_free(geob->file_name);
yading@11:     av_free(geob->description);
yading@11:     av_free(geob->data);
yading@11:     av_free(geob);
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Decode characters to UTF-8 according to encoding type. The decoded buffer is
yading@11:  * always null terminated. Stop reading when either *maxread bytes are read from
yading@11:  * pb or U+0000 character is found.
yading@11:  *
yading@11:  * @param dst Pointer where the address of the buffer with the decoded bytes is
yading@11:  * stored. Buffer must be freed by caller.
yading@11:  * @param maxread Pointer to maximum number of characters to read from the
yading@11:  * AVIOContext. After execution the value is decremented by the number of bytes
yading@11:  * actually read.
yading@11:  * @returns 0 if no error occurred, dst is uninitialized on error
yading@11:  */
yading@11: static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
yading@11:                       uint8_t **dst, int *maxread)
yading@11: {
yading@11:     int ret;
yading@11:     uint8_t tmp;
yading@11:     uint32_t ch = 1;
yading@11:     int left = *maxread;
yading@11:     unsigned int (*get)(AVIOContext*) = avio_rb16;
yading@11:     AVIOContext *dynbuf;
yading@11: 
yading@11:     if ((ret = avio_open_dyn_buf(&dynbuf)) < 0) {
yading@11:         av_log(s, AV_LOG_ERROR, "Error opening memory stream\n");
yading@11:         return ret;
yading@11:     }
yading@11: 
yading@11:     switch (encoding) {
yading@11: 
yading@11:     case ID3v2_ENCODING_ISO8859:
yading@11:         while (left && ch) {
yading@11:             ch = avio_r8(pb);
yading@11:             PUT_UTF8(ch, tmp, avio_w8(dynbuf, tmp);)
yading@11:             left--;
yading@11:         }
yading@11:         break;
yading@11: 
yading@11:     case ID3v2_ENCODING_UTF16BOM:
yading@11:         if ((left -= 2) < 0) {
yading@11:             av_log(s, AV_LOG_ERROR, "Cannot read BOM value, input too short\n");
yading@11:             avio_close_dyn_buf(dynbuf, dst);
yading@11:             av_freep(dst);
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:         switch (avio_rb16(pb)) {
yading@11:         case 0xfffe:
yading@11:             get = avio_rl16;
yading@11:         case 0xfeff:
yading@11:             break;
yading@11:         default:
yading@11:             av_log(s, AV_LOG_ERROR, "Incorrect BOM value\n");
yading@11:             avio_close_dyn_buf(dynbuf, dst);
yading@11:             av_freep(dst);
yading@11:             *maxread = left;
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:         // fall-through
yading@11: 
yading@11:     case ID3v2_ENCODING_UTF16BE:
yading@11:         while ((left > 1) && ch) {
yading@11:             GET_UTF16(ch, ((left -= 2) >= 0 ? get(pb) : 0), break;)
yading@11:             PUT_UTF8(ch, tmp, avio_w8(dynbuf, tmp);)
yading@11:         }
yading@11:         if (left < 0)
yading@11:             left += 2; /* did not read last char from pb */
yading@11:         break;
yading@11: 
yading@11:     case ID3v2_ENCODING_UTF8:
yading@11:         while (left && ch) {
yading@11:             ch = avio_r8(pb);
yading@11:             avio_w8(dynbuf, ch);
yading@11:             left--;
yading@11:         }
yading@11:         break;
yading@11:     default:
yading@11:         av_log(s, AV_LOG_WARNING, "Unknown encoding\n");
yading@11:     }
yading@11: 
yading@11:     if (ch)
yading@11:         avio_w8(dynbuf, 0);
yading@11: 
yading@11:     avio_close_dyn_buf(dynbuf, dst);
yading@11:     *maxread = left;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Parse a text tag.
yading@11:  */
yading@11: static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen, const char *key)
yading@11: {
yading@11:     uint8_t *dst;
yading@11:     int encoding, dict_flags = AV_DICT_DONT_OVERWRITE | AV_DICT_DONT_STRDUP_VAL;
yading@11:     unsigned genre;
yading@11: 
yading@11:     if (taglen < 1)
yading@11:         return;
yading@11: 
yading@11:     encoding = avio_r8(pb);
yading@11:     taglen--; /* account for encoding type byte */
yading@11: 
yading@11:     if (decode_str(s, pb, encoding, &dst, &taglen) < 0) {
yading@11:         av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", key);
yading@11:         return;
yading@11:     }
yading@11: 
yading@11:     if (!(strcmp(key, "TCON") && strcmp(key, "TCO"))
yading@11:         && (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1)
yading@11:         && genre <= ID3v1_GENRE_MAX) {
yading@11:         av_freep(&dst);
yading@11:         dst = av_strdup(ff_id3v1_genre_str[genre]);
yading@11:     } else if (!(strcmp(key, "TXXX") && strcmp(key, "TXX"))) {
yading@11:         /* dst now contains the key, need to get value */
yading@11:         key = dst;
yading@11:         if (decode_str(s, pb, encoding, &dst, &taglen) < 0) {
yading@11:             av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", key);
yading@11:             av_freep(&key);
yading@11:             return;
yading@11:         }
yading@11:         dict_flags |= AV_DICT_DONT_STRDUP_KEY;
yading@11:     } else if (!*dst)
yading@11:         av_freep(&dst);
yading@11: 
yading@11:     if (dst)
yading@11:         av_dict_set(&s->metadata, key, dst, dict_flags);
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * Parse GEOB tag into a ID3v2ExtraMetaGEOB struct.
yading@11:  */
yading@11: static void read_geobtag(AVFormatContext *s, AVIOContext *pb, int taglen, char *tag, ID3v2ExtraMeta **extra_meta)
yading@11: {
yading@11:     ID3v2ExtraMetaGEOB *geob_data = NULL;
yading@11:     ID3v2ExtraMeta *new_extra = NULL;
yading@11:     char encoding;
yading@11:     unsigned int len;
yading@11: 
yading@11:     if (taglen < 1)
yading@11:         return;
yading@11: 
yading@11:     geob_data = av_mallocz(sizeof(ID3v2ExtraMetaGEOB));
yading@11:     if (!geob_data) {
yading@11:         av_log(s, AV_LOG_ERROR, "Failed to alloc %zu bytes\n", sizeof(ID3v2ExtraMetaGEOB));
yading@11:         return;
yading@11:     }
yading@11: 
yading@11:     new_extra = av_mallocz(sizeof(ID3v2ExtraMeta));
yading@11:     if (!new_extra) {
yading@11:         av_log(s, AV_LOG_ERROR, "Failed to alloc %zu bytes\n", sizeof(ID3v2ExtraMeta));
yading@11:         goto fail;
yading@11:     }
yading@11: 
yading@11:     /* read encoding type byte */
yading@11:     encoding = avio_r8(pb);
yading@11:     taglen--;
yading@11: 
yading@11:     /* read MIME type (always ISO-8859) */
yading@11:     if (decode_str(s, pb, ID3v2_ENCODING_ISO8859, &geob_data->mime_type, &taglen) < 0
yading@11:         || taglen <= 0)
yading@11:         goto fail;
yading@11: 
yading@11:     /* read file name */
yading@11:     if (decode_str(s, pb, encoding, &geob_data->file_name, &taglen) < 0
yading@11:         || taglen <= 0)
yading@11:         goto fail;
yading@11: 
yading@11:     /* read content description */
yading@11:     if (decode_str(s, pb, encoding, &geob_data->description, &taglen) < 0
yading@11:         || taglen < 0)
yading@11:         goto fail;
yading@11: 
yading@11:     if (taglen) {
yading@11:         /* save encapsulated binary data */
yading@11:         geob_data->data = av_malloc(taglen);
yading@11:         if (!geob_data->data) {
yading@11:             av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", taglen);
yading@11:             goto fail;
yading@11:         }
yading@11:         if ((len = avio_read(pb, geob_data->data, taglen)) < taglen)
yading@11:             av_log(s, AV_LOG_WARNING, "Error reading GEOB frame, data truncated.\n");
yading@11:         geob_data->datasize = len;
yading@11:     } else {
yading@11:         geob_data->data = NULL;
yading@11:         geob_data->datasize = 0;
yading@11:     }
yading@11: 
yading@11:     /* add data to the list */
yading@11:     new_extra->tag = "GEOB";
yading@11:     new_extra->data = geob_data;
yading@11:     new_extra->next = *extra_meta;
yading@11:     *extra_meta = new_extra;
yading@11: 
yading@11:     return;
yading@11: 
yading@11: fail:
yading@11:     av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", tag);
yading@11:     free_geobtag(geob_data);
yading@11:     av_free(new_extra);
yading@11:     return;
yading@11: }
yading@11: 
yading@11: static int is_number(const char *str)
yading@11: {
yading@11:     while (*str >= '0' && *str <= '9') str++;
yading@11:     return !*str;
yading@11: }
yading@11: 
yading@11: static AVDictionaryEntry* get_date_tag(AVDictionary *m, const char *tag)
yading@11: {
yading@11:     AVDictionaryEntry *t;
yading@11:     if ((t = av_dict_get(m, tag, NULL, AV_DICT_MATCH_CASE)) &&
yading@11:         strlen(t->value) == 4 && is_number(t->value))
yading@11:         return t;
yading@11:     return NULL;
yading@11: }
yading@11: 
yading@11: static void merge_date(AVDictionary **m)
yading@11: {
yading@11:     AVDictionaryEntry *t;
yading@11:     char date[17] = {0};      // YYYY-MM-DD hh:mm
yading@11: 
yading@11:     if (!(t = get_date_tag(*m, "TYER")) &&
yading@11:         !(t = get_date_tag(*m, "TYE")))
yading@11:         return;
yading@11:     av_strlcpy(date, t->value, 5);
yading@11:     av_dict_set(m, "TYER", NULL, 0);
yading@11:     av_dict_set(m, "TYE",  NULL, 0);
yading@11: 
yading@11:     if (!(t = get_date_tag(*m, "TDAT")) &&
yading@11:         !(t = get_date_tag(*m, "TDA")))
yading@11:         goto finish;
yading@11:     snprintf(date + 4, sizeof(date) - 4, "-%.2s-%.2s", t->value + 2, t->value);
yading@11:     av_dict_set(m, "TDAT", NULL, 0);
yading@11:     av_dict_set(m, "TDA",  NULL, 0);
yading@11: 
yading@11:     if (!(t = get_date_tag(*m, "TIME")) &&
yading@11:         !(t = get_date_tag(*m, "TIM")))
yading@11:         goto finish;
yading@11:     snprintf(date + 10, sizeof(date) - 10, " %.2s:%.2s", t->value, t->value + 2);
yading@11:     av_dict_set(m, "TIME", NULL, 0);
yading@11:     av_dict_set(m, "TIM",  NULL, 0);
yading@11: 
yading@11: finish:
yading@11:     if (date[0])
yading@11:         av_dict_set(m, "date", date, 0);
yading@11: }
yading@11: 
yading@11: static void free_apic(void *obj)
yading@11: {
yading@11:     ID3v2ExtraMetaAPIC *apic = obj;
yading@11:     av_buffer_unref(&apic->buf);
yading@11:     av_freep(&apic->description);
yading@11:     av_freep(&apic);
yading@11: }
yading@11: 
yading@11: static void read_apic(AVFormatContext *s, AVIOContext *pb, int taglen, char *tag, ID3v2ExtraMeta **extra_meta)
yading@11: {
yading@11:     int enc, pic_type;
yading@11:     char             mimetype[64];
yading@11:     const CodecMime     *mime = ff_id3v2_mime_tags;
yading@11:     enum AVCodecID           id = AV_CODEC_ID_NONE;
yading@11:     ID3v2ExtraMetaAPIC  *apic = NULL;
yading@11:     ID3v2ExtraMeta *new_extra = NULL;
yading@11:     int64_t               end = avio_tell(pb) + taglen;
yading@11: 
yading@11:     if (taglen <= 4)
yading@11:         goto fail;
yading@11: 
yading@11:     new_extra = av_mallocz(sizeof(*new_extra));
yading@11:     apic      = av_mallocz(sizeof(*apic));
yading@11:     if (!new_extra || !apic)
yading@11:         goto fail;
yading@11: 
yading@11:     enc = avio_r8(pb);
yading@11:     taglen--;
yading@11: 
yading@11:     /* mimetype */
yading@11:     taglen -= avio_get_str(pb, taglen, mimetype, sizeof(mimetype));
yading@11:     while (mime->id != AV_CODEC_ID_NONE) {
yading@11:         if (!av_strncasecmp(mime->str, mimetype, sizeof(mimetype))) {
yading@11:             id = mime->id;
yading@11:             break;
yading@11:         }
yading@11:         mime++;
yading@11:     }
yading@11:     if (id == AV_CODEC_ID_NONE) {
yading@11:         av_log(s, AV_LOG_WARNING, "Unknown attached picture mimetype: %s, skipping.\n", mimetype);
yading@11:         goto fail;
yading@11:     }
yading@11:     apic->id = id;
yading@11: 
yading@11:     /* picture type */
yading@11:     pic_type = avio_r8(pb);
yading@11:     taglen--;
yading@11:     if (pic_type < 0 || pic_type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types)) {
yading@11:         av_log(s, AV_LOG_WARNING, "Unknown attached picture type %d.\n", pic_type);
yading@11:         pic_type = 0;
yading@11:     }
yading@11:     apic->type = ff_id3v2_picture_types[pic_type];
yading@11: 
yading@11:     /* description and picture data */
yading@11:     if (decode_str(s, pb, enc, &apic->description, &taglen) < 0) {
yading@11:         av_log(s, AV_LOG_ERROR, "Error decoding attached picture description.\n");
yading@11:         goto fail;
yading@11:     }
yading@11: 
yading@11:     apic->buf = av_buffer_alloc(taglen + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:     if (!apic->buf || !taglen || avio_read(pb, apic->buf->data, taglen) != taglen)
yading@11:         goto fail;
yading@11:     memset(apic->buf->data + taglen, 0, FF_INPUT_BUFFER_PADDING_SIZE);
yading@11: 
yading@11:     new_extra->tag    = "APIC";
yading@11:     new_extra->data   = apic;
yading@11:     new_extra->next   = *extra_meta;
yading@11:     *extra_meta       = new_extra;
yading@11: 
yading@11:     return;
yading@11: 
yading@11: fail:
yading@11:     if (apic)
yading@11:         free_apic(apic);
yading@11:     av_freep(&new_extra);
yading@11:     avio_seek(pb, end, SEEK_SET);
yading@11: }
yading@11: 
yading@11: static void read_chapter(AVFormatContext *s, AVIOContext *pb, int taglen, char *tag, ID3v2ExtraMeta **extra_meta)
yading@11: {
yading@11:     AVRational time_base = {1, 1000};
yading@11:     char title[1024];
yading@11:     uint32_t start, end;
yading@11: 
yading@11:     taglen -= avio_get_str(pb, taglen, title, sizeof(title));
yading@11:     if (taglen < 16)
yading@11:         return;
yading@11: 
yading@11:     start = avio_rb32(pb);
yading@11:     end   = avio_rb32(pb);
yading@11:     taglen -= 27;
yading@11:     if (taglen > 0) {
yading@11:         char tag[4];
yading@11: 
yading@11:         avio_skip(pb, 8);
yading@11:         avio_read(pb, tag, 4);
yading@11:         if (!memcmp(tag, "TIT2", 4)) {
yading@11:             taglen = FFMIN(taglen, avio_rb32(pb));
yading@11:             if (taglen < 0)
yading@11:                 return;
yading@11:             avio_skip(pb, 3);
yading@11:             avio_get_str(pb, taglen, title, sizeof(title));
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     avpriv_new_chapter(s, s->nb_chapters + 1, time_base, start, end, title);
yading@11: }
yading@11: 
yading@11: typedef struct ID3v2EMFunc {
yading@11:     const char *tag3;
yading@11:     const char *tag4;
yading@11:     void (*read)(AVFormatContext*, AVIOContext*, int, char*, ID3v2ExtraMeta **);
yading@11:     void (*free)(void *obj);
yading@11: } ID3v2EMFunc;
yading@11: 
yading@11: static const ID3v2EMFunc id3v2_extra_meta_funcs[] = {
yading@11:     { "GEO", "GEOB", read_geobtag, free_geobtag },
yading@11:     { "PIC", "APIC", read_apic,    free_apic },
yading@11:     { "CHAP","CHAP", read_chapter, NULL },
yading@11:     { NULL }
yading@11: };
yading@11: 
yading@11: /**
yading@11:  * Get the corresponding ID3v2EMFunc struct for a tag.
yading@11:  * @param isv34 Determines if v2.2 or v2.3/4 strings are used
yading@11:  * @return A pointer to the ID3v2EMFunc struct if found, NULL otherwise.
yading@11:  */
yading@11: static const ID3v2EMFunc *get_extra_meta_func(const char *tag, int isv34)
yading@11: {
yading@11:     int i = 0;
yading@11:     while (id3v2_extra_meta_funcs[i].tag3) {
yading@11:         if (tag && !memcmp(tag,
yading@11:                     (isv34 ? id3v2_extra_meta_funcs[i].tag4 :
yading@11:                              id3v2_extra_meta_funcs[i].tag3),
yading@11:                     (isv34 ? 4 : 3)))
yading@11:             return &id3v2_extra_meta_funcs[i];
yading@11:         i++;
yading@11:     }
yading@11:     return NULL;
yading@11: }
yading@11: 
yading@11: static void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags, ID3v2ExtraMeta **extra_meta)
yading@11: {
yading@11:     int isv34, unsync;
yading@11:     unsigned tlen;
yading@11:     char tag[5];
yading@11:     int64_t next, end = avio_tell(s->pb) + len;
yading@11:     int taghdrlen;
yading@11:     const char *reason = NULL;
yading@11:     AVIOContext pb;
yading@11:     AVIOContext *pbx;
yading@11:     unsigned char *buffer = NULL;
yading@11:     int buffer_size = 0;
yading@11:     const ID3v2EMFunc *extra_func = NULL;
yading@11:     unsigned char *uncompressed_buffer = NULL;
yading@11:     int uncompressed_buffer_size = 0;
yading@11: 
yading@11:     av_log(s, AV_LOG_DEBUG, "id3v2 ver:%d flags:%02X len:%d\n", version, flags, len);
yading@11: 
yading@11:     switch (version) {
yading@11:     case 2:
yading@11:         if (flags & 0x40) {
yading@11:             reason = "compression";
yading@11:             goto error;
yading@11:         }
yading@11:         isv34 = 0;
yading@11:         taghdrlen = 6;
yading@11:         break;
yading@11: 
yading@11:     case 3:
yading@11:     case 4:
yading@11:         isv34 = 1;
yading@11:         taghdrlen = 10;
yading@11:         break;
yading@11: 
yading@11:     default:
yading@11:         reason = "version";
yading@11:         goto error;
yading@11:     }
yading@11: 
yading@11:     unsync = flags & 0x80;
yading@11: 
yading@11:     if (isv34 && flags & 0x40) { /* Extended header present, just skip over it */
yading@11:         int extlen = get_size(s->pb, 4);
yading@11:         if (version == 4)
yading@11:             extlen -= 4;     // in v2.4 the length includes the length field we just read
yading@11: 
yading@11:         if (extlen < 0) {
yading@11:             reason = "invalid extended header length";
yading@11:             goto error;
yading@11:         }
yading@11:         avio_skip(s->pb, extlen);
yading@11:         len -= extlen + 4;
yading@11:         if (len < 0) {
yading@11:             reason = "extended header too long.";
yading@11:             goto error;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     while (len >= taghdrlen) {
yading@11:         unsigned int tflags = 0;
yading@11:         int tunsync = 0;
yading@11:         int tcomp = 0;
yading@11:         int tencr = 0;
yading@11:         unsigned long dlen;
yading@11: 
yading@11:         if (isv34) {
yading@11:             avio_read(s->pb, tag, 4);
yading@11:             tag[4] = 0;
yading@11:             if(version==3){
yading@11:                 tlen = avio_rb32(s->pb);
yading@11:             }else
yading@11:                 tlen = get_size(s->pb, 4);
yading@11:             tflags = avio_rb16(s->pb);
yading@11:             tunsync = tflags & ID3v2_FLAG_UNSYNCH;
yading@11:         } else {
yading@11:             avio_read(s->pb, tag, 3);
yading@11:             tag[3] = 0;
yading@11:             tlen = avio_rb24(s->pb);
yading@11:         }
yading@11:         if (tlen > (1<<28))
yading@11:             break;
yading@11:         len -= taghdrlen + tlen;
yading@11: 
yading@11:         if (len < 0)
yading@11:             break;
yading@11: 
yading@11:         next = avio_tell(s->pb) + tlen;
yading@11: 
yading@11:         if (!tlen) {
yading@11:             if (tag[0])
yading@11:                 av_log(s, AV_LOG_DEBUG, "Invalid empty frame %s, skipping.\n", tag);
yading@11:             continue;
yading@11:         }
yading@11: 
yading@11:         if (tflags & ID3v2_FLAG_DATALEN) {
yading@11:             if (tlen < 4)
yading@11:                 break;
yading@11:             dlen = avio_rb32(s->pb);
yading@11:             tlen -= 4;
yading@11:         } else
yading@11:             dlen = tlen;
yading@11: 
yading@11:         tcomp = tflags & ID3v2_FLAG_COMPRESSION;
yading@11:         tencr = tflags & ID3v2_FLAG_ENCRYPTION;
yading@11: 
yading@11:         /* skip encrypted tags and, if no zlib, compressed tags */
yading@11:         if (tencr || (!CONFIG_ZLIB && tcomp)) {
yading@11:             const char *type;
yading@11:             if (!tcomp)
yading@11:                 type = "encrypted";
yading@11:             else if (!tencr)
yading@11:                 type = "compressed";
yading@11:             else
yading@11:                 type = "encrypted and compressed";
yading@11: 
yading@11:             av_log(s, AV_LOG_WARNING, "Skipping %s ID3v2 frame %s.\n", type, tag);
yading@11:             avio_skip(s->pb, tlen);
yading@11:         /* check for text tag or supported special meta tag */
yading@11:         } else if (tag[0] == 'T' || (extra_meta && (extra_func = get_extra_meta_func(tag, isv34)))) {
yading@11:             pbx = s->pb;
yading@11: 
yading@11:             if (unsync || tunsync || tcomp) {
yading@11:                 av_fast_malloc(&buffer, &buffer_size, tlen);
yading@11:                 if (!buffer) {
yading@11:                     av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", tlen);
yading@11:                     goto seek;
yading@11:                 }
yading@11:             }
yading@11:             if (unsync || tunsync) {
yading@11:                 int64_t end = avio_tell(s->pb) + tlen;
yading@11:                 uint8_t *b;
yading@11: 
yading@11:                 b = buffer;
yading@11:                 while (avio_tell(s->pb) < end && b - buffer < tlen) {
yading@11:                     *b++ = avio_r8(s->pb);
yading@11:                     if (*(b - 1) == 0xff && avio_tell(s->pb) < end - 1 && b - buffer < tlen) {
yading@11:                         uint8_t val = avio_r8(s->pb);
yading@11:                         *b++ = val ? val : avio_r8(s->pb);
yading@11:                     }
yading@11:                 }
yading@11:                 ffio_init_context(&pb, buffer, b - buffer, 0, NULL, NULL, NULL, NULL);
yading@11:                 tlen = b - buffer;
yading@11:                 pbx = &pb; // read from sync buffer
yading@11:             }
yading@11: 
yading@11: #if CONFIG_ZLIB
yading@11:                 if (tcomp) {
yading@11:                     int err;
yading@11: 
yading@11:                     av_log(s, AV_LOG_DEBUG, "Compresssed frame %s tlen=%d dlen=%ld\n", tag, tlen, dlen);
yading@11: 
yading@11:                     av_fast_malloc(&uncompressed_buffer, &uncompressed_buffer_size, dlen);
yading@11:                     if (!uncompressed_buffer) {
yading@11:                         av_log(s, AV_LOG_ERROR, "Failed to alloc %ld bytes\n", dlen);
yading@11:                         goto seek;
yading@11:                     }
yading@11: 
yading@11:                     if (!(unsync || tunsync)) {
yading@11:                         err = avio_read(s->pb, buffer, tlen);
yading@11:                         if (err < 0) {
yading@11:                             av_log(s, AV_LOG_ERROR, "Failed to read compressed tag\n");
yading@11:                             goto seek;
yading@11:                         }
yading@11:                         tlen = err;
yading@11:                     }
yading@11: 
yading@11:                     err = uncompress(uncompressed_buffer, &dlen, buffer, tlen);
yading@11:                     if (err != Z_OK) {
yading@11:                         av_log(s, AV_LOG_ERROR, "Failed to uncompress tag: %d\n", err);
yading@11:                         goto seek;
yading@11:                     }
yading@11:                     ffio_init_context(&pb, uncompressed_buffer, dlen, 0, NULL, NULL, NULL, NULL);
yading@11:                     tlen = dlen;
yading@11:                     pbx = &pb; // read from sync buffer
yading@11:                 }
yading@11: #endif
yading@11:             if (tag[0] == 'T')
yading@11:                 /* parse text tag */
yading@11:                 read_ttag(s, pbx, tlen, tag);
yading@11:             else
yading@11:                 /* parse special meta tag */
yading@11:                 extra_func->read(s, pbx, tlen, tag, extra_meta);
yading@11:         }
yading@11:         else if (!tag[0]) {
yading@11:             if (tag[1])
yading@11:                 av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding\n");
yading@11:             avio_skip(s->pb, tlen);
yading@11:             break;
yading@11:         }
yading@11:         /* Skip to end of tag */
yading@11: seek:
yading@11:         avio_seek(s->pb, next, SEEK_SET);
yading@11:     }
yading@11: 
yading@11:     if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
yading@11:         end += 10;
yading@11: 
yading@11:   error:
yading@11:     if (reason)
yading@11:         av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
yading@11:     avio_seek(s->pb, end, SEEK_SET);
yading@11:     av_free(buffer);
yading@11:     av_free(uncompressed_buffer);
yading@11:     return;
yading@11: }
yading@11: 
yading@11: void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta)
yading@11: {
yading@11:     int len, ret;
yading@11:     uint8_t buf[ID3v2_HEADER_SIZE];
yading@11:     int     found_header;
yading@11:     int64_t off;
yading@11: 
yading@11:     do {
yading@11:         /* save the current offset in case there's nothing to read/skip */
yading@11:         off = avio_tell(s->pb);
yading@11:         ret = avio_read(s->pb, buf, ID3v2_HEADER_SIZE);
yading@11:         if (ret != ID3v2_HEADER_SIZE) {
yading@11:             avio_seek(s->pb, off, SEEK_SET);
yading@11:             break;
yading@11:         }
yading@11:         found_header = ff_id3v2_match(buf, magic);
yading@11:         if (found_header) {
yading@11:             /* parse ID3v2 header */
yading@11:             len = ((buf[6] & 0x7f) << 21) |
yading@11:                   ((buf[7] & 0x7f) << 14) |
yading@11:                   ((buf[8] & 0x7f) << 7) |
yading@11:                    (buf[9] & 0x7f);
yading@11:             ff_id3v2_parse(s, len, buf[3], buf[5], extra_meta);
yading@11:         } else {
yading@11:             avio_seek(s->pb, off, SEEK_SET);
yading@11:         }
yading@11:     } while (found_header);
yading@11:     ff_metadata_conv(&s->metadata, NULL, ff_id3v2_34_metadata_conv);
yading@11:     ff_metadata_conv(&s->metadata, NULL, id3v2_2_metadata_conv);
yading@11:     ff_metadata_conv(&s->metadata, NULL, ff_id3v2_4_metadata_conv);
yading@11:     merge_date(&s->metadata);
yading@11: }
yading@11: 
yading@11: void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
yading@11: {
yading@11:     ID3v2ExtraMeta *current = *extra_meta, *next;
yading@11:     const ID3v2EMFunc *extra_func;
yading@11: 
yading@11:     while (current) {
yading@11:         if ((extra_func = get_extra_meta_func(current->tag, 1)))
yading@11:             extra_func->free(current->data);
yading@11:         next = current->next;
yading@11:         av_freep(&current);
yading@11:         current = next;
yading@11:     }
yading@11: }
yading@11: 
yading@11: int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
yading@11: {
yading@11:     ID3v2ExtraMeta *cur;
yading@11: 
yading@11:     for (cur = *extra_meta; cur; cur = cur->next) {
yading@11:         ID3v2ExtraMetaAPIC *apic;
yading@11:         AVStream *st;
yading@11: 
yading@11:         if (strcmp(cur->tag, "APIC"))
yading@11:             continue;
yading@11:         apic = cur->data;
yading@11: 
yading@11:         if (!(st = avformat_new_stream(s, NULL)))
yading@11:             return AVERROR(ENOMEM);
yading@11: 
yading@11:         st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;
yading@11:         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:         st->codec->codec_id   = apic->id;
yading@11:         av_dict_set(&st->metadata, "title",   apic->description, 0);
yading@11:         av_dict_set(&st->metadata, "comment", apic->type, 0);
yading@11: 
yading@11:         av_init_packet(&st->attached_pic);
yading@11:         st->attached_pic.buf          = apic->buf;
yading@11:         st->attached_pic.data         = apic->buf->data;
yading@11:         st->attached_pic.size         = apic->buf->size - FF_INPUT_BUFFER_PADDING_SIZE;
yading@11:         st->attached_pic.stream_index = st->index;
yading@11:         st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
yading@11: 
yading@11:         apic->buf = NULL;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }