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mp3enc: add support for writing UTF-16 tags 

Also it gets rid of some mysterious magic numbers in code.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Anton Khirnov 2011-01-21 18:18:09 +00:00 committed by Mans Rullgard
parent 4ad66441c9
commit 187e23478b
1 changed files with 31 additions and 17 deletions
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48
libavformat/mp3enc.c
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@ -76,14 +76,38 @@ static void id3v2_put_size(AVFormatContext *s, int size)
put_byte(s->pb, size & 0x7f);
}
static void id3v2_put_ttag(AVFormatContext *s, const char *buf, int len,
uint32_t tag)
/**
* 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.
*/
static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2,
uint32_t tag, enum ID3v2Encoding enc)
{
int len;
uint8_t *pb;
void (*put)(ByteIOContext*, const char*) = avio_put_str;
ByteIOContext *dyn_buf;
if (url_open_dyn_buf(&dyn_buf) < 0)
return 0;
put_byte(dyn_buf, enc);
if (enc == ID3v2_ENCODING_UTF16BOM) {
put_le16(dyn_buf, 0xFEFF); /* BOM */
put = avio_put_str16le;
}
put(dyn_buf, str1);
if (str2)
put(dyn_buf, str2);
len = url_close_dyn_buf(dyn_buf, &pb);
put_be32(s->pb, tag);
id3v2_put_size(s, len + 1);
id3v2_put_size(s, len);
put_be16(s->pb, 0);
put_byte(s->pb, 3); /* UTF-8 */
put_buffer(s->pb, buf, len);
put_buffer(s->pb, pb, len);
av_freep(&pb);
return len + ID3v2_HEADER_SIZE;
}
@ -148,25 +172,15 @@ static int mp3_write_header(struct AVFormatContext *s)
int i;
for (i = 0; *ff_id3v2_tags[i]; i++)
if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) {
int len = strlen(t->value);
tag = AV_RB32(t->key);
totlen += len + ID3v2_HEADER_SIZE + 2;
id3v2_put_ttag(s, t->value, len + 1, tag);
totlen += id3v2_put_ttag(s, t->value, NULL, tag, ID3v2_ENCODING_UTF8);
break;
}
}
if (!tag) { /* unknown tag, write as TXXX frame */
int len = strlen(t->key), len1 = strlen(t->value);
char *buf = av_malloc(len + len1 + 2);
if (!buf)
return AVERROR(ENOMEM);
tag = MKBETAG('T', 'X', 'X', 'X');
strcpy(buf, t->key);
strcpy(buf + len + 1, t->value);
id3v2_put_ttag(s, buf, len + len1 + 2, tag);
totlen += len + len1 + ID3v2_HEADER_SIZE + 3;
av_free(buf);
totlen += id3v2_put_ttag(s, t->key, t->value, tag, ID3v2_ENCODING_UTF8);
}
}