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Add a get_sbits_long() function.

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Originally committed as revision 17740 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles
2009-03-03 02:00:47 +00:00
parent 8858990f07
commit 017c0811a1
1 changed files with 8 additions and 0 deletions
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8
libavcodec/bitstream.h
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@ -33,6 +33,7 @@
#include "libavutil/common.h" #include "libavutil/common.h"
#include "libavutil/intreadwrite.h" #include "libavutil/intreadwrite.h"
#include "libavutil/log.h" #include "libavutil/log.h"
#include "mathops.h"
#if defined(ALT_BITSTREAM_READER_LE) && !defined(ALT_BITSTREAM_READER) #if defined(ALT_BITSTREAM_READER_LE) && !defined(ALT_BITSTREAM_READER)
# define ALT_BITSTREAM_READER # define ALT_BITSTREAM_READER
@ -706,6 +707,13 @@ static inline unsigned int get_bits_long(GetBitContext *s, int n){
} }
} }
/**
* reads 0-32 bits as a signed integer.
*/
static inline int get_sbits_long(GetBitContext *s, int n) {
return sign_extend(get_bits_long(s, n), n);
}
/** /**
* shows 0-32 bits. * shows 0-32 bits.
*/ */