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FFmpeg/libavformat/id3v2.c
wm4 48bc9fffd1 id3v2: fix unsynchronization 
The ID3v2 "unsynchronization scheme" requires replacing any 0xFF 0x00
sequences with 0xFF. This has to be done on every byte of the source
data, while the current code skipped a byte after a replacement. This
meant 0xFF 0x00 0xFF 00 was translated to 0xFF 0xFF 0x00 instead of 0xFF
0xFF. It feels a bit messy to do this correctly with the avio use. But
fortunately, this translation can be done in-place, so we can just do it
in memory.

Inspired by what taglib does.

Also see 9ae80e6a9c. (The sample file for
that commit is gone, so it could not be retested.)
2018-02-04 15:19:41 +01:00

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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 "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) {
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; // 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(&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;
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;
}
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;
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) {
av_free(key);
av_free(escaped);
return ret;
}
}
}
return 0;
}
int ff_id3v2_parse_priv(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
{
return ff_id3v2_parse_priv_dict(&s->metadata, extra_meta);
}
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