47 {
"TCOM",
"composer" },
49 {
"TCOP",
"copyright" },
50 {
"TENC",
"encoded_by" },
52 {
"TLAN",
"language" },
54 {
"TPE2",
"album_artist" },
55 {
"TPE3",
"performer" },
57 {
"TPUB",
"publisher" },
59 {
"TSSE",
"encoder" },
65 {
"TCMP",
"compilation" },
68 {
"TDEN",
"creation_time" },
69 {
"TSOA",
"album-sort" },
70 {
"TSOP",
"artist-sort" },
71 {
"TSOT",
"title-sort" },
78 {
"TCP",
"compilation" },
80 {
"TEN",
"encoded_by" },
82 {
"TP2",
"album_artist" },
83 {
"TP3",
"performer" },
89 "TALB",
"TBPM",
"TCOM",
"TCON",
"TCOP",
"TDLY",
"TENC",
"TEXT",
90 "TFLT",
"TIT1",
"TIT2",
"TIT3",
"TKEY",
"TLAN",
"TLEN",
"TMED",
91 "TOAL",
"TOFN",
"TOLY",
"TOPE",
"TOWN",
"TPE1",
"TPE2",
"TPE3",
92 "TPE4",
"TPOS",
"TPUB",
"TRCK",
"TRSN",
"TRSO",
"TSRC",
"TSSE",
97 "TDEN",
"TDOR",
"TDRC",
"TDRL",
"TDTG",
"TIPL",
"TMCL",
"TMOO",
98 "TPRO",
"TSOA",
"TSOP",
"TSOT",
"TSST",
103 "TDAT",
"TIME",
"TORY",
"TRDA",
"TSIZ",
"TYER",
109 "32x32 pixels 'file icon'",
114 "Media (e.g. label side of CD)",
115 "Lead artist/lead performer/soloist",
120 "Lyricist/text writer",
121 "Recording Location",
123 "During performance",
124 "Movie/video screen capture",
125 "A bright coloured fish",
127 "Band/artist logotype",
128 "Publisher/Studio logotype",
145 return buf[0] == magic[0] &&
146 buf[1] == magic[1] &&
147 buf[2] == magic[2] &&
150 (buf[6] & 0x80) == 0 &&
151 (buf[7] & 0x80) == 0 &&
152 (buf[8] & 0x80) == 0 &&
153 (buf[9] & 0x80) == 0;
158 int len = ((buf[6] & 0x7f) << 21) +
159 ((buf[7] & 0x7f) << 14) +
160 ((buf[8] & 0x7f) << 7) +
172 v = (v << 7) + (
avio_r8(s) & 0x7F);
178 return (((size) & (0x7f << 0)) >> 0) +
179 (((
size) & (0x7f << 8)) >> 1) +
180 (((
size) & (0x7f << 16)) >> 2) +
181 (((
size) & (0x7f << 24)) >> 3);
192 if ((buf[len] <
'A' ||
267 if ((left -= 2) < 0) {
288 while ((left > 1) && ch) {
289 GET_UTF16(ch, ((left -= 2) >= 0 ?
get(pb) : 0),
break;)
332 if (
decode_str(s, pb, encoding, &dst, &taglen) < 0) {
337 if (!(strcmp(key,
"TCON") && strcmp(key,
"TCO")) &&
338 (sscanf(dst,
"(%d)", &genre) == 1 || sscanf(dst,
"%d", &genre) == 1) &&
342 }
else if (!(strcmp(key,
"TXXX") && strcmp(key,
"TXX"))) {
345 if (
decode_str(s, pb, encoding, &dst, &taglen) < 0) {
379 if (
decode_str(s, pb, encoding, &descriptor, &taglen) < 0)
382 if (
decode_str(s, pb, encoding, &text, &taglen) < 0)
386 key =
av_asprintf(
"lyrics-%s%s%s", descriptor[0] ? (
char *)descriptor :
"",
387 descriptor[0] ?
"-" :
"",
410 const char *
key =
"comment";
422 if (
decode_str(s, pb, encoding, &dst, &taglen) < 0) {
431 key = (
const char *) dst;
435 if (
decode_str(s, pb, encoding, &dst, &taglen) < 0) {
443 av_dict_set(metadata, key, (
const char *) dst, dict_flags);
493 if (!geob_data->
data) {
499 "Error reading GEOB frame, data truncated.\n");
507 new_extra->
tag =
"GEOB";
508 new_extra->
next = *extra_meta;
509 *extra_meta = new_extra;
522 while (*str >=
'0' && *str <=
'9')
539 char date[17] = { 0 };
558 snprintf(date + 10,
sizeof(date) - 10,
577 size_t len = strlen(buf);
578 while (len > 0 && buf[len - 1] ==
' ')
587 char mimetype[64] = {0};
594 if (taglen <= 4 || (!isv34 && taglen <= 6))
609 if (ret < 0 || ret >= taglen)
629 "Unknown attached picture mimetype: %s, skipping.\n", mimetype);
647 "Error decoding attached picture description.\n");
656 new_extra->
tag =
"APIC";
657 new_extra->
next = *extra_meta;
658 *extra_meta = new_extra;
711 if (taglen < 0 || taglen > len)
723 new_extra->
tag =
"CHAP";
724 new_extra->
next = *extra_meta;
725 *extra_meta = new_extra;
766 meta->
next = *extra_meta;
801 while (id3v2_extra_meta_funcs[i].
tag3) {
802 if (tag && !memcmp(tag,
803 (isv34 ? id3v2_extra_meta_funcs[i].
tag4 :
804 id3v2_extra_meta_funcs[i].tag3),
806 return &id3v2_extra_meta_funcs[
i];
821 const char *reason =
NULL;
827 unsigned char *uncompressed_buffer =
NULL;
828 av_unused int uncompressed_buffer_size = 0;
829 const char *comm_frame;
836 reason =
"compression";
856 unsync = flags & 0x80;
858 if (isv34 && flags & 0x40) {
865 reason =
"invalid extended header length";
871 reason =
"extended header too long.";
876 while (len >= taghdrlen) {
877 unsigned int tflags = 0;
902 else if (
check_tag(pb, cur + 2 + tlen, 4) != 1)
919 len -= taghdrlen + tlen;
945 if (tencr || (!CONFIG_ZLIB && tcomp)) {
952 type =
"encrypted and compressed";
957 }
else if (tag[0] ==
'T' ||
958 !memcmp(tag,
"USLT", 4) ||
959 !strcmp(tag, comm_frame) ||
964 if (unsync || tunsync || tcomp) {
971 if (unsync || tunsync) {
976 if (
avio_read(pb, buffer, tlen) != tlen) {
983 if (t != end && t[-1] == 0xff && !t[0])
1001 if (dlen / 32768 > tlen)
1004 av_fast_malloc(&uncompressed_buffer, &uncompressed_buffer_size, dlen);
1005 if (!uncompressed_buffer) {
1010 if (!(unsync || tunsync)) {
1019 err = uncompress(uncompressed_buffer, &dlen, buffer, tlen);
1032 else if (!memcmp(tag,
"USLT", 4))
1034 else if (!strcmp(tag, comm_frame))
1038 extra_func->
read(s, pbx, tlen, tag, extra_meta, isv34);
1039 }
else if (!tag[0]) {
1051 if (version == 4 && flags & 0x10)
1095 len = ((buf[6] & 0x7f) << 21) |
1096 ((buf[7] & 0x7f) << 14) |
1097 ((buf[8] & 0x7f) << 7) |
1099 id3v2_parse(pb, metadata, s, len, buf[3], buf[5], extra_meta);
1103 }
while (found_header);
1130 next = current->
next;
1142 for (cur = extra_meta; cur; cur = cur->
next) {
1146 if (strcmp(cur->
tag,
"APIC"))
1184 int num_chapters = 0;
1189 for (cur = extra_meta; cur; cur = cur->
next) {
1192 if (strcmp(cur->
tag,
"CHAP"))
1200 for (i = 0; i < (num_chapters / 2); i++) {
1204 right_index = (num_chapters - 1) - i;
1205 right = chapters[right_index];
1207 chapters[right_index] = chapters[
i];
1208 chapters[
i] = right;
1211 for (i = 0; i < num_chapters; i++) {
1234 for (cur = extra_meta; cur; cur = cur->
next) {
1235 if (!strcmp(cur->
tag,
"PRIV")) {
1238 char *escaped, *
key;
1247 for (i = 0; i < priv->
datasize; i++) {
1248 if (priv->
data[i] < 32 || priv->
data[i] > 126 || priv->
data[i] ==
'\\') {
1260 if ((ret =
av_dict_set(metadata, key, escaped, dict_flags)) < 0) {
int ff_id3v2_parse_priv(AVFormatContext *s, ID3v2ExtraMeta *extra_meta)
Add metadata for all PRIV tags in the ID3v2 header.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
void av_bprintf(AVBPrint *buf, const char *fmt,...)
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
static int is_number(const char *str)
static AVDictionaryEntry * get_date_tag(AVDictionary *m, const char *tag)
#define AV_LOG_WARNING
Something somehow does not look correct.
#define AV_DICT_DONT_OVERWRITE
Don't overwrite existing entries.
static const ID3v2EMFunc id3v2_extra_meta_funcs[]
static void id3v2_parse(AVIOContext *pb, AVDictionary **metadata, AVFormatContext *s, int len, uint8_t version, uint8_t flags, ID3v2ExtraMeta **extra_meta)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
int index
stream index in AVFormatContext
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
int av_strncasecmp(const char *a, const char *b, size_t n)
Locale-independent case-insensitive compare.
#define ID3v2_PRIV_METADATA_PREFIX
int av_dict_copy(AVDictionary **dst, const AVDictionary *src, int flags)
Copy entries from one AVDictionary struct into another.
static void read_apic(AVFormatContext *s, AVIOContext *pb, int taglen, const char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
static void free_apic(void *obj)
const char ff_id3v2_4_tags[][4]
ID3v2.4-only text information frames.
#define FF_ARRAY_ELEMS(a)
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
#define PUT_UTF8(val, tmp, PUT_BYTE)
Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
static void error(const char *err)
unsigned int avio_rb16(AVIOContext *s)
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding, uint8_t **dst, int *maxread)
Decode characters to UTF-8 according to encoding type.
#define AV_DICT_DONT_STRDUP_KEY
Take ownership of a key that's been allocated with av_malloc() or another memory allocation function...
static void id3v2_read_internal(AVIOContext *pb, AVDictionary **metadata, AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta, int64_t max_search_size)
#define ID3v2_HEADER_SIZE
const AVMetadataConv ff_id3v2_34_metadata_conv[]
unsigned int avio_rb32(AVIOContext *s)
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
static void read_priv(AVFormatContext *s, AVIOContext *pb, int taglen, const char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta *extra_meta)
Create chapters for all CHAP tags found in the ID3v2 header.
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
int av_dynarray_add_nofree(void *tab_ptr, int *nb_ptr, void *elem)
Add an element to a dynamic array.
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
static int is_tag(const char *buf, unsigned int len)
#define GET_UTF16(val, GET_16BIT, ERROR)
Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
AVCodecID
Identify the syntax and semantics of the bitstream.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define AV_DICT_MATCH_CASE
Only get an entry with exact-case key match.
AVDictionary * metadata
Metadata that applies to the whole file.
#define AV_BPRINT_SIZE_UNLIMITED
const AVMetadataConv ff_id3v2_4_metadata_conv[]
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
static void free_priv(void *obj)
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
enum AVMediaType codec_type
General type of the encoded data.
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
static void read_comment(AVFormatContext *s, AVIOContext *pb, int taglen, AVDictionary **metadata)
Parse a comment tag.
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
int flags
A combination of AV_PKT_FLAG values.
static unsigned int size_to_syncsafe(unsigned int size)
int avio_r8(AVIOContext *s)
char * av_asprintf(const char *fmt,...)
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
const CodecMime ff_id3v2_mime_tags[]
unsigned int avio_rb24(AVIOContext *s)
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen, AVDictionary **metadata, const char *key)
Parse a text tag.
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
static void free_geobtag(void *obj)
Free GEOB type extra metadata.
static unsigned int get_size(AVIOContext *s, int len)
static void read_geobtag(AVFormatContext *s, AVIOContext *pb, int taglen, const char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
Parse GEOB tag into a ID3v2ExtraMetaGEOB struct.
#define ID3v2_FLAG_UNSYNCH
static void merge_date(AVDictionary **m)
void ffio_free_dyn_buf(AVIOContext **s)
Free a dynamic buffer.
void(* read)(AVFormatContext *s, AVIOContext *pb, int taglen, const char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
const char ff_id3v2_tags[][4]
A list of text information frames allowed in both ID3 v2.3 and v2.4 http://www.id3.org/id3v2.4.0-frames http://www.id3.org/id3v2.4.0-changes.
#define AV_LOG_INFO
Standard information.
char * av_strdup(const char *s)
Duplicate a string.
AVBufferRef * av_buffer_alloc(int size)
Allocate an AVBuffer of the given size using av_malloc().
AVIOContext * pb
I/O context.
void avio_w8(AVIOContext *s, int b)
uint8_t * data
The data buffer.
#define ID3v2_FLAG_COMPRESSION
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2]...the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so...,+,-,+,-,+,+,-,+,-,+,...hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32-hcoeff[1]-hcoeff[2]-...a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2}an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||.........intra?||||:Block01:yes no||||:Block02:.................||||:Block03::y DC::ref index:||||:Block04::cb DC::motion x:||||.........:cr DC::motion y:||||.................|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------------------------------|||Y subbands||Cb subbands||Cr subbands||||------||------||------|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||------||------||------||||------||------||------|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||------||------||------||||------||------||------|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||------||------||------||||------||------||------|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------------------------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction------------|\Dequantization-------------------\||Reference frames|\IDWT|--------------|Motion\|||Frame 0||Frame 1||Compensation.OBMC v-------|--------------|--------------.\------> Frame n output Frame Frame<----------------------------------/|...|-------------------Range Coder:============Binary Range Coder:-------------------The implemented range coder is an adapted version based upon"Range encoding: an algorithm for removing redundancy from a digitised message."by G.N.N.Martin.The symbols encoded by the Snow range coder are bits(0|1).The associated probabilities are not fix but change depending on the symbol mix seen so far.bit seen|new state---------+-----------------------------------------------0|256-state_transition_table[256-old_state];1|state_transition_table[old_state];state_transition_table={0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:-------------------------FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1.the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta *extra_meta)
Create a stream for each APIC (attached picture) extracted from the ID3v2 header. ...
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Undefined Behavior In the C language
int ff_id3v2_parse_priv_dict(AVDictionary **metadata, ID3v2ExtraMeta *extra_meta)
Parse PRIV tags into a dictionary.
Rational number (pair of numerator and denominator).
int size
Size of data in bytes.
static void read_uslt(AVFormatContext *s, AVIOContext *pb, int taglen, AVDictionary **metadata)
#define flags(name, subs,...)
static int check_tag(AVIOContext *s, int offset, unsigned int len)
Return 1 if the tag of length len at the given offset is valid, 0 if not, -1 on error.
static void rstrip_spaces(char *buf)
static const ID3v2EMFunc * get_extra_meta_func(const char *tag, int isv34)
Get the corresponding ID3v2EMFunc struct for a tag.
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
static void free_chapter(void *obj)
unsigned int avio_rl16(AVIOContext *s)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_RB64
int ff_id3v2_match(const uint8_t *buf, const char *magic)
Detect ID3v2 Header.
int ffio_init_context(AVIOContext *s, unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
int disposition
AV_DISPOSITION_* bit field.
#define ID3v2_FLAG_ENCRYPTION
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta, unsigned int max_search_size)
Read an ID3v2 tag, including supported extra metadata.
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
const char ff_id3v2_3_tags[][4]
ID3v2.3-only text information frames.
void ff_id3v2_read_dict(AVIOContext *pb, AVDictionary **metadata, const char *magic, ID3v2ExtraMeta **extra_meta)
Read an ID3v2 tag into specified dictionary and retrieve supported extra metadata.
int ff_id3v2_tag_len(const uint8_t *buf)
Get the length of an ID3v2 tag.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
const char *const ff_id3v2_picture_types[21]
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
unsigned int avio_rl24(AVIOContext *s)
#define ID3v2_FLAG_DATALEN
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
const char *const ff_id3v1_genre_str[ID3v1_GENRE_MAX+1]
ID3v1 genres.
static void read_chapter(AVFormatContext *s, AVIOContext *pb, int len, const char *ttag, ID3v2ExtraMeta **extra_meta, int isv34)
AVPacket attached_pic
For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet will contain the attached pictu...
static const AVMetadataConv id3v2_2_metadata_conv[]
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.