#include "id3v2.h"
#include "id3v1.h"
#include "libavutil/avstring.h"
+#include "libavutil/intreadwrite.h"
+#include "metadata.h"
-int ff_id3v2_match(const uint8_t *buf)
+int ff_id3v2_match(const uint8_t *buf, const char * magic)
{
- return buf[0] == 'I' &&
- buf[1] == 'D' &&
- buf[2] == '3' &&
+ return buf[0] == magic[0] &&
+ buf[1] == magic[1] &&
+ buf[2] == magic[2] &&
buf[3] != 0xff &&
buf[4] != 0xff &&
(buf[6] & 0x80) == 0 &&
return len;
}
-void ff_id3v2_read(AVFormatContext *s)
+void ff_id3v2_read(AVFormatContext *s, const char *magic)
{
int len, ret;
uint8_t buf[ID3v2_HEADER_SIZE];
+ int found_header;
+ int64_t off;
- ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
- if (ret != ID3v2_HEADER_SIZE)
- return;
- if (ff_id3v2_match(buf)) {
- /* parse ID3v2 header */
- len = ((buf[6] & 0x7f) << 21) |
- ((buf[7] & 0x7f) << 14) |
- ((buf[8] & 0x7f) << 7) |
- (buf[9] & 0x7f);
- ff_id3v2_parse(s, len, buf[3], buf[5]);
- } else {
- url_fseek(s->pb, 0, SEEK_SET);
- }
+ do {
+ /* save the current offset in case there's nothing to read/skip */
+ off = url_ftell(s->pb);
+ ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
+ if (ret != ID3v2_HEADER_SIZE)
+ return;
+ 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);
+ ff_id3v2_parse(s, len, buf[3], buf[5]);
+ } else {
+ url_fseek(s->pb, off, SEEK_SET);
+ }
+ } while (found_header);
}
static unsigned int get_size(ByteIOContext *s, int len)
return v;
}
-static void read_ttag(AVFormatContext *s, int taglen, const char *key)
+static void read_ttag(AVFormatContext *s, ByteIOContext *pb, int taglen, const char *key)
{
char *q, dst[512];
const char *val = NULL;
taglen--; /* account for encoding type byte */
- switch (get_byte(s->pb)) { /* encoding type */
+ switch (get_byte(pb)) { /* encoding type */
case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
q = dst;
while (taglen-- && q - dst < dstlen - 7) {
uint8_t tmp;
- PUT_UTF8(get_byte(s->pb), tmp, *q++ = tmp;)
+ PUT_UTF8(get_byte(pb), tmp, *q++ = tmp;)
}
*q = 0;
break;
case 1: /* UTF-16 with BOM */
taglen -= 2;
- switch (get_be16(s->pb)) {
+ switch (get_be16(pb)) {
case 0xfffe:
get = get_le16;
case 0xfeff:
uint32_t ch;
uint8_t tmp;
- GET_UTF16(ch, ((taglen -= 2) >= 0 ? get(s->pb) : 0), break;)
+ GET_UTF16(ch, ((taglen -= 2) >= 0 ? get(pb) : 0), break;)
PUT_UTF8(ch, tmp, *q++ = tmp;)
}
*q = 0;
case 3: /* UTF-8 */
len = FFMIN(taglen, dstlen);
- get_buffer(s->pb, dst, len);
+ get_buffer(pb, dst, len);
dst[len] = 0;
break;
default:
val = dst;
if (val)
- av_metadata_set(&s->metadata, key, val);
+ av_metadata_set2(&s->metadata, key, val, 0);
}
void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
{
- int isv34, tlen;
+ int isv34, tlen, unsync;
char tag[5];
int64_t next;
int taghdrlen;
const char *reason;
+ ByteIOContext pb;
+ unsigned char *buffer = NULL;
+ int buffer_size = 0;
switch (version) {
case 2:
goto error;
}
- if (flags & 0x80) {
- reason = "unsynchronization";
- goto error;
- }
+ unsync = flags & 0x80;
if (isv34 && flags & 0x40) /* Extended header present, just skip over it */
url_fskip(s->pb, get_size(s->pb, 4));
while (len >= taghdrlen) {
+ unsigned int tflags;
+ int tunsync = 0;
+
if (isv34) {
get_buffer(s->pb, tag, 4);
tag[4] = 0;
tlen = get_be32(s->pb);
}else
tlen = get_size(s->pb, 4);
- get_be16(s->pb); /* flags */
+ tflags = get_be16(s->pb);
+ tunsync = tflags & ID3v2_FLAG_UNSYNCH;
} else {
get_buffer(s->pb, tag, 3);
tag[3] = 0;
next = url_ftell(s->pb) + tlen;
- if (tag[0] == 'T')
- read_ttag(s, tlen, tag);
+ if (tflags & ID3v2_FLAG_DATALEN) {
+ get_be32(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);
+ url_fskip(s->pb, tlen);
+ } else if (tag[0] == 'T') {
+ if (unsync || tunsync) {
+ int i, j;
+ av_fast_malloc(&buffer, &buffer_size, tlen);
+ for (i = 0, j = 0; i < tlen; i++, j++) {
+ buffer[j] = get_byte(s->pb);
+ if (j > 0 && !buffer[j] && buffer[j - 1] == 0xff) {
+ /* Unsynchronised byte, skip it */
+ j--;
+ }
+ }
+ init_put_byte(&pb, buffer, j, 0, NULL, NULL, NULL, NULL);
+ read_ttag(s, &pb, j, tag);
+ } else {
+ read_ttag(s, s->pb, tlen, tag);
+ }
+ }
else if (!tag[0]) {
if (tag[1])
av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding");
- url_fskip(s->pb, len);
+ url_fskip(s->pb, tlen);
break;
}
/* Skip to end of tag */
url_fseek(s->pb, next, SEEK_SET);
}
+ ff_metadata_conv(&s->metadata, NULL, ff_id3v2_metadata_conv);
+ if (len > 0) {
+ /* Skip padding */
+ url_fskip(s->pb, len);
+ }
if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
url_fskip(s->pb, 10);
+
+ av_free(buffer);
return;
error:
av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
url_fskip(s->pb, len);
+ av_free(buffer);
}
const AVMetadataConv ff_id3v2_metadata_conv[] = {
{ "TCOP", "copyright"},
{ "TDRL", "date"},
{ "TDRC", "date"},
+ { "TDEN", "creation_time"},
{ "TENC", "encoded_by"},
{ "TEN", "encoded_by"},
{ "TIT2", "title"},
projects / ffmpeg / blobdiff