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FFmpeg/libavformat/id3v2enc.c
Gilles Bouthenot 929e5159bc avformat/id3v2enc: fix bad ID3v2 tag length
2020-01-10 12:02:13 +01:00

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/*
* ID3v2 header writer
*
* 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
*/
#include <stdint.h>
#include <string.h>
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio.h"
#include "avio_internal.h"
#include "id3v2.h"
static void id3v2_put_size(AVIOContext *pb, int size)
{
avio_w8(pb, size >> 21 & 0x7f);
avio_w8(pb, size >> 14 & 0x7f);
avio_w8(pb, size >> 7 & 0x7f);
avio_w8(pb, size & 0x7f);
}
static int string_is_ascii(const uint8_t *str)
{
while (*str && *str < 128) str++;
return !*str;
}
static void id3v2_encode_string(AVIOContext *pb, const uint8_t *str,
enum ID3v2Encoding enc)
{
int (*put)(AVIOContext*, const char*);
if (enc == ID3v2_ENCODING_UTF16BOM) {
avio_wl16(pb, 0xFEFF); /* BOM */
put = avio_put_str16le;
} else
put = avio_put_str;
put(pb, str);
}
/**
* Write a text frame with one (normal frames) or two (TXXX frames) strings
* according to encoding (only UTF-8 or UTF-16+BOM supported).
* @return number of bytes written or a negative error code.
*/
static int id3v2_put_ttag(ID3v2EncContext *id3, AVIOContext *avioc, const char *str1, const char *str2,
uint32_t tag, enum ID3v2Encoding enc)
{
int len, ret;
uint8_t *pb;
AVIOContext *dyn_buf;
if ((ret = avio_open_dyn_buf(&dyn_buf)) < 0)
return ret;
/* check if the strings are ASCII-only and use UTF16 only if
* they're not */
if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) &&
(!str2 || string_is_ascii(str2)))
enc = ID3v2_ENCODING_ISO8859;
avio_w8(dyn_buf, enc);
id3v2_encode_string(dyn_buf, str1, enc);
if (str2)
id3v2_encode_string(dyn_buf, str2, enc);
len = avio_get_dyn_buf(dyn_buf, &pb);
avio_wb32(avioc, tag);
/* ID3v2.3 frame size is not sync-safe */
if (id3->version == 3)
avio_wb32(avioc, len);
else
id3v2_put_size(avioc, len);
avio_wb16(avioc, 0);
avio_write(avioc, pb, len);
ffio_free_dyn_buf(&dyn_buf);
return len + ID3v2_HEADER_SIZE;
}
/**
* Write a priv frame with owner and data. 'key' is the owner prepended with
* ID3v2_PRIV_METADATA_PREFIX. 'data' is provided as a string. Any \xXX
* (where 'X' is a valid hex digit) will be unescaped to the byte value.
*/
static int id3v2_put_priv(ID3v2EncContext *id3, AVIOContext *avioc, const char *key, const char *data)
{
int len, ret;
uint8_t *pb;
AVIOContext *dyn_buf;
if (!av_strstart(key, ID3v2_PRIV_METADATA_PREFIX, &key)) {
return 0;
}
if ((ret = avio_open_dyn_buf(&dyn_buf)) < 0)
return ret;
// owner + null byte.
avio_write(dyn_buf, key, strlen(key) + 1);
while (*data) {
if (av_strstart(data, "\\x", &data)) {
if (data[0] && data[1] && av_isxdigit(data[0]) && av_isxdigit(data[1])) {
char digits[] = {data[0], data[1], 0};
avio_w8(dyn_buf, strtol(digits, NULL, 16));
data += 2;
} else {
ffio_free_dyn_buf(&dyn_buf);
av_log(avioc, AV_LOG_ERROR, "Invalid escape '\\x%.2s' in metadata tag '"
ID3v2_PRIV_METADATA_PREFIX "%s'.\n", data, key);
return AVERROR(EINVAL);
}
} else {
avio_write(dyn_buf, data++, 1);
}
}
len = avio_get_dyn_buf(dyn_buf, &pb);
avio_wb32(avioc, MKBETAG('P', 'R', 'I', 'V'));
if (id3->version == 3)
avio_wb32(avioc, len);
else
id3v2_put_size(avioc, len);
avio_wb16(avioc, 0);
avio_write(avioc, pb, len);
ffio_free_dyn_buf(&dyn_buf);
return len + ID3v2_HEADER_SIZE;
}
static int id3v2_check_write_tag(ID3v2EncContext *id3, AVIOContext *pb, AVDictionaryEntry *t,
const char table[][4], enum ID3v2Encoding enc)
{
uint32_t tag;
int i;
if (t->key[0] != 'T' || strlen(t->key) != 4)
return -1;
tag = AV_RB32(t->key);
for (i = 0; *table[i]; i++)
if (tag == AV_RB32(table[i]))
return id3v2_put_ttag(id3, pb, t->value, NULL, tag, enc);
return -1;
}
static void id3v2_3_metadata_split_date(AVDictionary **pm)
{
AVDictionaryEntry *mtag = NULL;
AVDictionary *dst = NULL;
const char *key, *value;
char year[5] = {0}, day_month[5] = {0};
int i;
while ((mtag = av_dict_get(*pm, "", mtag, AV_DICT_IGNORE_SUFFIX))) {
key = mtag->key;
if (!av_strcasecmp(key, "date")) {
/* split date tag using "YYYY-MM-DD" format into year and month/day segments */
value = mtag->value;
i = 0;
while (value[i] >= '0' && value[i] <= '9') i++;
if (value[i] == '\0' || value[i] == '-') {
av_strlcpy(year, value, sizeof(year));
av_dict_set(&dst, "TYER", year, 0);
if (value[i] == '-' &&
value[i+1] >= '0' && value[i+1] <= '1' &&
value[i+2] >= '0' && value[i+2] <= '9' &&
value[i+3] == '-' &&
value[i+4] >= '0' && value[i+4] <= '3' &&
value[i+5] >= '0' && value[i+5] <= '9' &&
(value[i+6] == '\0' || value[i+6] == ' ')) {
snprintf(day_month, sizeof(day_month), "%.2s%.2s", value + i + 4, value + i + 1);
av_dict_set(&dst, "TDAT", day_month, 0);
}
} else
av_dict_set(&dst, key, value, 0);
} else
av_dict_set(&dst, key, mtag->value, 0);
}
av_dict_free(pm);
*pm = dst;
}
void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version,
const char *magic)
{
id3->version = id3v2_version;
avio_wb32(pb, MKBETAG(magic[0], magic[1], magic[2], id3v2_version));
avio_w8(pb, 0);
avio_w8(pb, 0); /* flags */
/* reserve space for size */
id3->size_pos = avio_tell(pb);
avio_wb32(pb, 0);
}
static int write_metadata(AVIOContext *pb, AVDictionary **metadata,
ID3v2EncContext *id3, int enc)
{
AVDictionaryEntry *t = NULL;
int ret;
ff_metadata_conv(metadata, ff_id3v2_34_metadata_conv, NULL);
if (id3->version == 3)
id3v2_3_metadata_split_date(metadata);
else if (id3->version == 4)
ff_metadata_conv(metadata, ff_id3v2_4_metadata_conv, NULL);
while ((t = av_dict_get(*metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
if ((ret = id3v2_check_write_tag(id3, pb, t, ff_id3v2_tags, enc)) > 0) {
id3->len += ret;
continue;
}
if ((ret = id3v2_check_write_tag(id3, pb, t, id3->version == 3 ?
ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
id3->len += ret;
continue;
}
if ((ret = id3v2_put_priv(id3, pb, t->key, t->value)) > 0) {
id3->len += ret;
continue;
} else if (ret < 0) {
return ret;
}
/* unknown tag, write as TXXX frame */
if ((ret = id3v2_put_ttag(id3, pb, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
return ret;
id3->len += ret;
}
return 0;
}
static int write_ctoc(AVFormatContext *s, ID3v2EncContext *id3, int enc)
{
uint8_t *dyn_buf;
AVIOContext *dyn_bc;
char name[123];
int len, ret;
if (s->nb_chapters == 0)
return 0;
if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
return ret;
avio_put_str(dyn_bc, "toc");
avio_w8(dyn_bc, 0x03);
avio_w8(dyn_bc, s->nb_chapters);
for (int i = 0; i < s->nb_chapters; i++) {
snprintf(name, 122, "ch%d", i);
avio_put_str(dyn_bc, name);
}
len = avio_get_dyn_buf(dyn_bc, &dyn_buf);
id3->len += len + ID3v2_HEADER_SIZE;
avio_wb32(s->pb, MKBETAG('C', 'T', 'O', 'C'));
avio_wb32(s->pb, len);
avio_wb16(s->pb, 0);
avio_write(s->pb, dyn_buf, len);
ffio_free_dyn_buf(&dyn_bc);
return ret;
}
static int write_chapter(AVFormatContext *s, ID3v2EncContext *id3, int id, int enc)
{
const AVRational time_base = {1, 1000};
AVChapter *ch = s->chapters[id];
uint8_t *dyn_buf;
AVIOContext *dyn_bc;
char name[123];
int len, start, end, ret;
if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
return ret;
start = av_rescale_q(ch->start, ch->time_base, time_base);
end = av_rescale_q(ch->end, ch->time_base, time_base);
snprintf(name, 122, "ch%d", id);
id3->len += avio_put_str(dyn_bc, name);
avio_wb32(dyn_bc, start);
avio_wb32(dyn_bc, end);
avio_wb32(dyn_bc, 0xFFFFFFFFu);
avio_wb32(dyn_bc, 0xFFFFFFFFu);
if ((ret = write_metadata(dyn_bc, &ch->metadata, id3, enc)) < 0)
goto fail;
len = avio_get_dyn_buf(dyn_bc, &dyn_buf);
id3->len += 16 + ID3v2_HEADER_SIZE;
avio_wb32(s->pb, MKBETAG('C', 'H', 'A', 'P'));
avio_wb32(s->pb, len);
avio_wb16(s->pb, 0);
avio_write(s->pb, dyn_buf, len);
fail:
ffio_free_dyn_buf(&dyn_bc);
return ret;
}
int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3)
{
int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
ID3v2_ENCODING_UTF8;
int i, ret;
ff_standardize_creation_time(s);
if ((ret = write_metadata(s->pb, &s->metadata, id3, enc)) < 0)
return ret;
if ((ret = write_ctoc(s, id3, enc)) < 0)
return ret;
for (i = 0; i < s->nb_chapters; i++) {
if ((ret = write_chapter(s, id3, i, enc)) < 0)
return ret;
}
return 0;
}
int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt)
{
AVStream *st = s->streams[pkt->stream_index];
AVDictionaryEntry *e;
AVIOContext *dyn_buf;
uint8_t *buf;
const CodecMime *mime = ff_id3v2_mime_tags;
const char *mimetype = NULL, *desc = "";
int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
ID3v2_ENCODING_UTF8;
int i, len, type = 0, ret;
/* get the mimetype*/
while (mime->id != AV_CODEC_ID_NONE) {
if (mime->id == st->codecpar->codec_id) {
mimetype = mime->str;
break;
}
mime++;
}
if (!mimetype) {
av_log(s, AV_LOG_ERROR, "No mimetype is known for stream %d, cannot "
"write an attached picture.\n", st->index);
return AVERROR(EINVAL);
}
/* get the picture type */
e = av_dict_get(st->metadata, "comment", NULL, 0);
for (i = 0; e && i < FF_ARRAY_ELEMS(ff_id3v2_picture_types); i++) {
if (!av_strcasecmp(e->value, ff_id3v2_picture_types[i])) {
type = i;
break;
}
}
/* get the description */
if ((e = av_dict_get(st->metadata, "title", NULL, 0)))
desc = e->value;
/* use UTF16 only for non-ASCII strings */
if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(desc))
enc = ID3v2_ENCODING_ISO8859;
/* start writing */
if ((ret = avio_open_dyn_buf(&dyn_buf)) < 0)
return ret;
avio_w8(dyn_buf, enc);
avio_put_str(dyn_buf, mimetype);
avio_w8(dyn_buf, type);
id3v2_encode_string(dyn_buf, desc, enc);
avio_write(dyn_buf, pkt->data, pkt->size);
len = avio_get_dyn_buf(dyn_buf, &buf);
avio_wb32(s->pb, MKBETAG('A', 'P', 'I', 'C'));
if (id3->version == 3)
avio_wb32(s->pb, len);
else
id3v2_put_size(s->pb, len);
avio_wb16(s->pb, 0);
avio_write(s->pb, buf, len);
ffio_free_dyn_buf(&dyn_buf);
id3->len += len + ID3v2_HEADER_SIZE;
return 0;
}
void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb,
int padding_bytes)
{
int64_t cur_pos;
if (padding_bytes < 0)
padding_bytes = 10;
/* The ID3v2.3 specification states that 28 bits are used to represent the
* size of the whole tag. Therefore the current size of the tag needs to be
* subtracted from the upper limit of 2^28-1 to clip the value correctly. */
/* The minimum of 10 is an arbitrary amount of padding at the end of the tag
* to fix cover art display with some software such as iTunes, Traktor,
* Serato, Torq. */
padding_bytes = av_clip(padding_bytes, 10, 268435455 - id3->len);
ffio_fill(pb, 0, padding_bytes);
id3->len += padding_bytes;
cur_pos = avio_tell(pb);
avio_seek(pb, id3->size_pos, SEEK_SET);
id3v2_put_size(pb, id3->len);
avio_seek(pb, cur_pos, SEEK_SET);
}
int ff_id3v2_write_simple(struct AVFormatContext *s, int id3v2_version,
const char *magic)
{
ID3v2EncContext id3 = { 0 };
int ret;
ff_id3v2_start(&id3, s->pb, id3v2_version, magic);
if ((ret = ff_id3v2_write_metadata(s, &id3)) < 0)
return ret;
ff_id3v2_finish(&id3, s->pb, s->metadata_header_padding);
return 0;
}
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