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id3v2: use an enum for encodings instead of magic numbers.

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Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit d66eff3685)
This commit is contained in:
Anton Khirnov 2011-01-19 10:13:25 +01:00 committed by Michael Niedermayer
parent a091006d3d
commit eeb0b893e3
2 changed files with 11 additions and 4 deletions
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8
libavformat/id3v2.c
View File

@ -74,7 +74,7 @@ static void read_ttag(AVFormatContext *s, ByteIOContext *pb, int taglen, const c
switch (get_byte(pb)) { /* encoding type */
case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
case ID3v2_ENCODING_ISO8859:
q = dst;
while (taglen-- && q - dst < dstlen - 7) {
uint8_t tmp;
@ -83,7 +83,7 @@ static void read_ttag(AVFormatContext *s, ByteIOContext *pb, int taglen, const c
*q = 0;
break;
case 1: /* UTF-16 with BOM */
case ID3v2_ENCODING_UTF16BOM:
taglen -= 2;
switch (get_be16(pb)) {
case 0xfffe:
@ -96,7 +96,7 @@ static void read_ttag(AVFormatContext *s, ByteIOContext *pb, int taglen, const c
}
// fall-through
case 2: /* UTF-16BE without BOM */
case ID3v2_ENCODING_UTF16BE:
q = dst;
while (taglen > 1 && q - dst < dstlen - 7) {
uint32_t ch;
@ -108,7 +108,7 @@ static void read_ttag(AVFormatContext *s, ByteIOContext *pb, int taglen, const c
*q = 0;
break;
case 3: /* UTF-8 */
case ID3v2_ENCODING_UTF8:
len = FFMIN(taglen, dstlen);
get_buffer(pb, dst, len);
dst[len] = 0;

7
libavformat/id3v2.h
View File

@ -38,6 +38,13 @@
#define ID3v2_FLAG_ENCRYPTION 0x0004
#define ID3v2_FLAG_COMPRESSION 0x0008
enum ID3v2Encoding {
ID3v2_ENCODING_ISO8859 = 0,
ID3v2_ENCODING_UTF16BOM = 1,
ID3v2_ENCODING_UTF16BE = 2,
ID3v2_ENCODING_UTF8 = 3,
};
/**
* Detect ID3v2 Header.
* @param buf must be ID3v2_HEADER_SIZE byte long