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id3v2: Add support for UTF-16 encoding.

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patch by Anton Khirnov, wyskas gmail com

Originally committed as revision 20006 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Anton Khirnov 2009-09-23 18:22:00 +00:00 committed by Diego Biurrun
parent 9aa1bcce51
commit 20c6837880
2 changed files with 52 additions and 0 deletions
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28
libavformat/id3v2.c
View File

@ -81,6 +81,7 @@ static void read_ttag(AVFormatContext *s, int taglen, const char *key)
char *q, dst[512];
int len, dstlen = sizeof(dst) - 1;
unsigned genre;
unsigned int (*get)(ByteIOContext*) = get_be16;
dst[0] = 0;
if (taglen < 1)
@ -99,11 +100,38 @@ static void read_ttag(AVFormatContext *s, int taglen, const char *key)
*q = 0;
break;
case 1: /* UTF-16 with BOM */
taglen -= 2;
switch (get_be16(s->pb)) {
case 0xfffe:
get = get_le16;
case 0xfeff:
break;
default:
av_log(s, AV_LOG_ERROR, "Incorrect BOM value in tag %s.\n", key);
return;
}
// fall-through
case 2: /* UTF-16BE without BOM */
q = dst;
while (taglen > 1 && q - dst < dstlen - 7) {
uint32_t ch;
uint8_t tmp;
GET_UTF16(ch, ((taglen -= 2) >= 0 ? get(s->pb) : 0), break;)
PUT_UTF8(ch, tmp, *q++ = tmp;)
}
*q = 0;
break;
case 3: /* UTF-8 */
len = FFMIN(taglen, dstlen - 1);
get_buffer(s->pb, dst, len);
dst[len] = 0;
break;
default:
av_log(s, AV_LOG_WARNING, "Unknown encoding in tag %s\n.", key);
}
if (!strcmp(key, "genre")

24
libavutil/common.h
View File

@ -265,6 +265,30 @@ static inline av_const int av_ceil_log2(int x)
}\
}
/*!
* \def GET_UTF16(val, GET_16BIT, ERROR)
* Converts a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form
* \param val is the output and should be of type uint32_t. It holds the converted
* UCS-4 character and should be a left value.
* \param GET_16BIT gets two bytes of UTF-16 encoded data converted to native endianness.
* It can be a function or a statement whose return value or evaluated value is of type
* uint16_t. It will be executed up to 2 times.
* \param ERROR action that should be taken when an invalid UTF-16 surrogate is
* returned from GET_BYTE. It should be a statement that jumps out of the macro,
* like exit(), goto, return, break, or continue.
*/
#define GET_UTF16(val, GET_16BIT, ERROR)\
val = GET_16BIT;\
{\
unsigned int hi = val - 0xD800;\
if (hi < 0x800) {\
val = GET_16BIT - 0xDC00;\
if (val > 0x3FFU || hi > 0x3FFU)\
ERROR\
val += (hi<<10) + 0x10000;\
}\
}\
/*!
* \def PUT_UTF8(val, tmp, PUT_BYTE)
* Converts a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).