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9806b9ab5c
FFmpeg/libavformat/id3v2.c
Anton Khirnov 9200514ad8 lavf: replace AVStream.codec with AVStream.codecpar 
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.

In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.

There are multiple important problems with this approach:
    - the fields in AVCodecContext are in general one of
        * stream parameters
        * codec options
        * codec state
      However, it's not clear which ones are which. It is consequently
      unclear which fields are a demuxer allowed to set or a muxer allowed to
      read. This leads to erratic behaviour depending on whether decoding or
      encoding is being performed or not (and whether it uses the AVStream
      embedded codec context).
    - various synchronization issues arising from the fact that the same
      context is used by several different APIs (muxers/demuxers,
      parsers, bitstream filters and encoders/decoders) simultaneously, with
      there being no clear rules for who can modify what and the different
      processes being typically delayed with respect to each other.
    - avformat_find_stream_info() making it necessary to support opening
      and closing a single codec context multiple times, thus
      complicating the semantics of freeing various allocated objects in the
      codec context.

Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
2016-02-23 17:01:58 +01:00

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/*
* ID3v2 header parser
* Copyright (c) 2003 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/intreadwrite.h"
#include "avio_internal.h"
#include "internal.h"
#include "id3v1.h"
#include "id3v2.h"
const AVMetadataConv ff_id3v2_34_metadata_conv[] = {
{ "TALB", "album" },
{ "TCOM", "composer" },
{ "TCON", "genre" },
{ "TCOP", "copyright" },
{ "TENC", "encoded_by" },
{ "TIT2", "title" },
{ "TLAN", "language" },
{ "TPE1", "artist" },
{ "TPE2", "album_artist" },
{ "TPE3", "performer" },
{ "TPOS", "disc" },
{ "TPUB", "publisher" },
{ "TRCK", "track" },
{ "TSSE", "encoder" },
{ 0 }
};
const AVMetadataConv ff_id3v2_4_metadata_conv[] = {
{ "TDRL", "date" },
{ "TDRC", "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" },
{ "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 *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;
}
/**
* Free GEOB type extra metadata.
*/
static void free_geobtag(void *obj)
{
ID3v2ExtraMetaGEOB *geob = obj;
av_free(geob->mime_type);
av_free(geob->file_name);
av_free(geob->description);
av_free(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,
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(&s->metadata, key, 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 %zu bytes\n",
sizeof(ID3v2ExtraMetaGEOB));
return;
}
new_extra = av_mallocz(sizeof(ID3v2ExtraMeta));
if (!new_extra) {
av_log(s, AV_LOG_ERROR, "Failed to alloc %zu 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 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 || 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;
return;
fail:
if (apic)
free_apic(apic);
av_freep(&new_extra);
avio_seek(pb, end, SEEK_SET);
}
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 },
{ 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 (!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(AVFormatContext *s, int len, uint8_t version,
uint8_t flags, ID3v2ExtraMeta **extra_meta)
{
int isv34, tlen, unsync;
char tag[5];
int64_t next, end = avio_tell(s->pb) + len;
int taghdrlen;
const char *reason = NULL;
AVIOContext pb;
AVIOContext *pbx;
unsigned char *buffer = NULL;
int buffer_size = 0;
const ID3v2EMFunc *extra_func;
switch (version) {
case 2:
if (flags & 0x40) {
reason = "compression";
goto error;
}
isv34 = 0;
taghdrlen = 6;
break;
case 3:
case 4:
isv34 = 1;
taghdrlen = 10;
break;
default:
reason = "version";
goto error;
}
unsync = flags & 0x80;
if (isv34 && flags & 0x40) { /* Extended header present, just skip over it */
int extlen = get_size(s->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(s->pb, extlen);
}
while (len >= taghdrlen) {
unsigned int tflags = 0;
int tunsync = 0;
if (isv34) {
avio_read(s->pb, tag, 4);
tag[4] = 0;
if (version == 3) {
tlen = avio_rb32(s->pb);
} else
tlen = get_size(s->pb, 4);
tflags = avio_rb16(s->pb);
tunsync = tflags & ID3v2_FLAG_UNSYNCH;
} else {
avio_read(s->pb, tag, 3);
tag[3] = 0;
tlen = avio_rb24(s->pb);
}
if (tlen < 0 || tlen > len - taghdrlen) {
av_log(s, AV_LOG_WARNING,
"Invalid size in frame %s, skipping the rest of tag.\n",
tag);
break;
}
len -= taghdrlen + tlen;
next = avio_tell(s->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) {
avio_rb32(s->pb);
tlen -= 4;
}
if (tflags & (ID3v2_FLAG_ENCRYPTION | ID3v2_FLAG_COMPRESSION)) {
av_log(s, AV_LOG_WARNING,
"Skipping encrypted/compressed ID3v2 frame %s.\n", tag);
avio_skip(s->pb, tlen);
/* check for text tag or supported special meta tag */
} else if (tag[0] == 'T' ||
(extra_meta &&
(extra_func = get_extra_meta_func(tag, isv34)))) {
if (unsync || tunsync) {
int64_t end = avio_tell(s->pb) + tlen;
uint8_t *b;
av_fast_malloc(&buffer, &buffer_size, tlen);
if (!buffer) {
av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", tlen);
goto seek;
}
b = buffer;
while (avio_tell(s->pb) < end && !s->pb->eof_reached) {
*b++ = avio_r8(s->pb);
if (*(b - 1) == 0xff && avio_tell(s->pb) < end - 1 &&
!s->pb->eof_reached ) {
uint8_t val = avio_r8(s->pb);
*b++ = val ? val : avio_r8(s->pb);
}
}
ffio_init_context(&pb, buffer, b - buffer, 0, NULL, NULL, NULL,
NULL);
tlen = b - buffer;
pbx = &pb; // read from sync buffer
} else {
pbx = s->pb; // read straight from input
}
if (tag[0] == 'T')
/* parse text tag */
read_ttag(s, pbx, tlen, tag);
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");
avio_skip(s->pb, tlen);
break;
}
/* Skip to end of tag */
seek:
avio_seek(s->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(s->pb, end, SEEK_SET);
av_free(buffer);
return;
}
void ff_id3v2_read(AVFormatContext *s, const char *magic,
ID3v2ExtraMeta **extra_meta)
{
int len, ret;
uint8_t buf[ID3v2_HEADER_SIZE];
int found_header;
int64_t off;
do {
/* save the current offset in case there's nothing to read/skip */
off = avio_tell(s->pb);
ret = avio_read(s->pb, buf, ID3v2_HEADER_SIZE);
if (ret != ID3v2_HEADER_SIZE)
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(s, len, buf[3], buf[5], extra_meta);
} else {
avio_seek(s->pb, off, SEEK_SET);
}
} while (found_header);
ff_metadata_conv(&s->metadata, NULL, ff_id3v2_34_metadata_conv);
ff_metadata_conv(&s->metadata, NULL, id3v2_2_metadata_conv);
ff_metadata_conv(&s->metadata, NULL, ff_id3v2_4_metadata_conv);
merge_date(&s->metadata);
}
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;
}
}
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 (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;
}
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