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Add PUT_UTF16() macro.

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Patch by Anton Khirnov <wyskas gmail com>.

Originally committed as revision 22030 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Anton Khirnov 2010-02-24 18:08:30 +00:00 committed by Ronald S. Bultje
parent 01b35be14a
commit ae529ddb32
1 changed files with 30 additions and 0 deletions
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30
libavutil/common.h
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@ -335,6 +335,36 @@ static inline av_const int av_ceil_log2(int x)
}\
}
/*!
* \def PUT_UTF16(val, tmp, PUT_16BIT)
* Converts a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
* \param val is an input-only argument and should be of type uint32_t. It holds
* a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
* val is given as a function it is executed only once.
* \param tmp is a temporary variable and should be of type uint16_t. It
* represents an intermediate value during conversion that is to be
* output by PUT_16BIT.
* \param PUT_16BIT writes the converted UTF-16 data to any proper destination
* in desired endianness. It could be a function or a statement, and uses tmp
* as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"
* PUT_BYTE will be executed 1 or 2 times depending on input character.
*/
#define PUT_UTF16(val, tmp, PUT_16BIT)\
{\
uint32_t in = val;\
if (in < 0x10000) {\
tmp = in;\
PUT_16BIT\
} else {\
tmp = 0xD800 | ((in - 0x10000) >> 10);\
PUT_16BIT\
tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
PUT_16BIT\
}\
}\
#include "mem.h"
#ifdef HAVE_AV_CONFIG_H