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FFmpeg/libavformat/id3v2.c

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/*
* 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/bprint.h"
#include "libavutil/dict.h"
#include "libavutil/intreadwrite.h"
#include "libavcodec/png.h"
#include "avio_internal.h"
#include "demux.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" },
{ "TIT1", "grouping" },
{ 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);
}
/**
* 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;
char *key;
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 || taglen < 0)
goto error;
if (decode_str(s, pb, encoding, &text, &taglen) < 0 || 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) {
av_free(text);
goto error;
}
av_dict_set(metadata, key, text,
AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
ok = 1;
error:
if (!ok)
av_log(s, AV_LOG_ERROR, "Error reading lyrics, skipped\n");
av_free(descriptor);
}
/**
* 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);
}
typedef struct ExtraMetaList {
ID3v2ExtraMeta *head, *tail;
} ExtraMetaList;
static void list_append(ID3v2ExtraMeta *new_elem, ExtraMetaList *list)
{
if (list->tail)
list->tail->next = new_elem;
else
list->head = new_elem;
list->tail = new_elem;
}
/**
* Parse GEOB tag into a ID3v2ExtraMetaGEOB struct.
*/
static void read_geobtag(AVFormatContext *s, AVIOContext *pb, int taglen,
const char *tag, ExtraMetaList *extra_meta, int isv34)
{
ID3v2ExtraMetaGEOB *geob_data = NULL;
ID3v2ExtraMeta *new_extra = NULL;
char encoding;
unsigned int len;
if (taglen < 1)
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));
return;
}
geob_data = &new_extra->data.geob;
/* 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";
list_append(new_extra, extra_meta);
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);
}
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, ExtraMetaList *extra_meta, int isv34)
{
int enc, pic_type;
char mimetype[64] = {0};
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));
if (!new_extra)
goto fail;
apic = &new_extra->data.apic;
enc = avio_r8(pb);
taglen--;
/* mimetype */
if (isv34) {
int ret = avio_get_str(pb, taglen, mimetype, sizeof(mimetype));
if (ret < 0 || ret >= taglen)
goto fail;
taglen -= ret;
} else {
if (avio_read(pb, mimetype, 3) < 0)
goto fail;
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";
// 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);
list_append(new_extra, extra_meta);
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);
}
static void read_chapter(AVFormatContext *s, AVIOContext *pb, int len,
const char *ttag, ExtraMetaList *extra_meta, int isv34)
{
int taglen;
char tag[5];
ID3v2ExtraMeta *new_extra = NULL;
ID3v2ExtraMetaCHAP *chap = NULL;
new_extra = av_mallocz(sizeof(*new_extra));
if (!new_extra)
return;
chap = &new_extra->data.chap;
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";
list_append(new_extra, extra_meta);
return;
fail:
free_chapter(chap);
av_freep(&new_extra);
}
static void free_priv(void *obj)
{
ID3v2ExtraMetaPRIV *priv = obj;
av_freep(&priv->owner);
av_freep(&priv->data);
}
static void read_priv(AVFormatContext *s, AVIOContext *pb, int taglen,
const char *tag, ExtraMetaList *extra_meta, int isv34)
{
ID3v2ExtraMeta *meta;
ID3v2ExtraMetaPRIV *priv;
meta = av_mallocz(sizeof(*meta));
if (!meta)
return;
priv = &meta->data.priv;
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";
list_append(meta, extra_meta);
return;
fail:
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, ExtraMetaList *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, ExtraMetaList *extra_meta)
{
int isv34, unsync;
unsigned tlen;
char tag[5];
int64_t next, end = avio_tell(pb);
int taghdrlen;
const char *reason = NULL;
FFIOContext 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;
if (end > INT64_MAX - len - 10)
return;
end += len;
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) {
uint8_t *b = buffer;
uint8_t *t = buffer;
uint8_t *end = t + tlen;
if (avio_read(pb, buffer, tlen) != tlen) {
av_log(s, AV_LOG_ERROR, "Failed to read tag data\n");
goto seek;
}
while (t != end) {
*b++ = *t++;
if (t != end && t[-1] == 0xff && !t[0])
t++;
}
ffio_init_context(&pb_local, buffer, b - buffer, 0, NULL, NULL, NULL,
NULL);
tlen = b - buffer;
pbx = &pb_local.pub; // 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);
if (tlen <= 0)
goto seek;
if (dlen / 32768 > tlen)
goto seek;
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.pub; // 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_metap, int64_t max_search_size)
{
int len, ret;
uint8_t buf[ID3v2_HEADER_SIZE];
ExtraMetaList extra_meta = { NULL };
int found_header;
int64_t start, off;
if (extra_metap)
*extra_metap = NULL;
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_metap ? &extra_meta : NULL);
} 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);
if (extra_metap)
*extra_metap = extra_meta.head;
}
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(&current);
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;
int ret;
if (strcmp(cur->tag, "APIC"))
continue;
apic = &cur->data.apic;
ret = ff_add_attached_pic(s, NULL, NULL, &apic->buf, 0);
if (ret < 0)
return ret;
st = s->streams[s->nb_streams - 1];
st->codecpar->codec_id = apic->id;
if (AV_RB64(st->attached_pic.data) == PNGSIG)
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);
}
return 0;
}
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta *cur)
{
AVRational time_base = {1, 1000};
int ret;
for (unsigned i = 0; cur; cur = cur->next) {
ID3v2ExtraMetaCHAP *chap;
AVChapter *chapter;
if (strcmp(cur->tag, "CHAP"))
continue;
chap = &cur->data.chap;
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)
return ret;
}
return 0;
}
int ff_id3v2_parse_priv_dict(AVDictionary **metadata, ID3v2ExtraMeta *extra_meta)
{
ID3v2ExtraMeta *cur;
int dict_flags = AV_DICT_DONT_OVERWRITE | AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL;
for (cur = extra_meta; cur; cur = cur->next) {
if (!strcmp(cur->tag, "PRIV")) {
ID3v2ExtraMetaPRIV *priv = &cur->data.priv;
AVBPrint bprint;
char *escaped, *key;
int i, ret;
if ((key = av_asprintf(ID3v2_PRIV_METADATA_PREFIX "%s", priv->owner)) == NULL) {
return AVERROR(ENOMEM);
}
av_bprint_init(&bprint, priv->datasize + 1, AV_BPRINT_SIZE_UNLIMITED);
for (i = 0; i < priv->datasize; i++) {
if (priv->data[i] < 32 || priv->data[i] > 126 || priv->data[i] == '\\') {
av_bprintf(&bprint, "\\x%02x", priv->data[i]);
} else {
av_bprint_chars(&bprint, priv->data[i], 1);
}
}
if ((ret = av_bprint_finalize(&bprint, &escaped)) < 0) {
av_free(key);
return ret;
}
if ((ret = av_dict_set(metadata, key, escaped, dict_flags)) < 0) {
return ret;
}
}
}
return 0;
}
int ff_id3v2_parse_priv(AVFormatContext *s, ID3v2ExtraMeta *extra_meta)
{
return ff_id3v2_parse_priv_dict(&s->metadata, extra_meta);
}