Revision 0e8c148b libavutil/common.h

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libavutil/common.h
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#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
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#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
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/*!
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 * \def PUT_UTF8(val, GET_BYTE, ERROR)
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 * converts a 32-bit unicode character to its utf-8 encoded form (up to 6 bytes long).
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 * \param val is an input only argument and should be of type uint32_t. It holds
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 * a ucs4 encoded unicode character that is to be converted to utf-8. If
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 * val is given as a function it's executed only once.
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 * \param tmp is a temporary variable and should be of type uint8_t. It
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 * represents an intermediate value during conversion that is to be
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 * outputted by PUT_BYTE.
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 * \param PUT_BYTE writes the converted utf-8 bytes to any proper destination.
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 * It could be a function or a statement, and uses tmp as the input byte.
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 * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
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 * executed up to 6 times, depending on the length of the converted
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 * unicode character.
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 */
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#define GET_UTF8(val, GET_BYTE, ERROR)\
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    val= GET_BYTE;\
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    {\
......
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        }\
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    }
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/*!
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 * \def PUT_UTF8(val, GET_BYTE, ERROR)
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 * converts a 32-bit unicode character to its utf-8 encoded form (up to 6 bytes long).
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 * \param val is an input only argument and should be of type uint32_t. It holds
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 * a ucs4 encoded unicode character that is to be converted to utf-8. If
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 * val is given as a function it's executed only once.
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 * \param tmp is a temporary variable and should be of type uint8_t. It
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 * represents an intermediate value during conversion that is to be
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 * outputted by PUT_BYTE.
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 * \param PUT_BYTE writes the converted utf-8 bytes to any proper destination.
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 * It could be a function or a statement, and uses tmp as the input byte.
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 * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
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 * executed up to 6 times, depending on the length of the converted
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 * unicode character.
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 */
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#define PUT_UTF8(val, tmp, PUT_BYTE)\
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    {\
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        int bytes, shift;\

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