Commit bce3bd1c authored by Stefan Gehrer's avatar Stefan Gehrer
Browse files

renormalize VP5/6/7/8 range coder without loop

Originally committed as revision 23915 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 0db2d3cf
......@@ -376,7 +376,7 @@ OBJS-$(CONFIG_VP5_DECODER) += vp5.o vp56.o vp56data.o vp56dsp.o \
OBJS-$(CONFIG_VP6_DECODER) += vp6.o vp56.o vp56data.o vp56dsp.o \
vp3dsp.o vp6dsp.o huffman.o
OBJS-$(CONFIG_VP8_DECODER) += vp8.o vp8dsp.o vp56.o vp56data.o \
h264pred.o
h264pred.o cabac.o
OBJS-$(CONFIG_VQA_DECODER) += vqavideo.o
OBJS-$(CONFIG_WAVPACK_DECODER) += wavpack.o
OBJS-$(CONFIG_WMAPRO_DECODER) += wmaprodec.o wma.o
......
......@@ -28,6 +28,7 @@
#include "dsputil.h"
#include "get_bits.h"
#include "bytestream.h"
#include "cabac.h"
#include "vp56dsp.h"
typedef struct vp56_context VP56Context;
......@@ -195,6 +196,7 @@ static inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
unsigned int low_shift = low << 8;
int bit = c->code_word >= low_shift;
int shift;
if (bit) {
c->high -= low;
......@@ -204,13 +206,13 @@ static inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
}
/* normalize */
while (c->high < 128) {
c->high <<= 1;
c->code_word <<= 1;
if (--c->bits == 0 && c->buffer < c->end) {
c->bits = 8;
c->code_word |= *c->buffer++;
}
shift = ff_h264_norm_shift[c->high] - 1;
c->high <<= shift;
c->code_word <<= shift;
c->bits -= shift;
if(c->bits <= 0 && c->buffer < c->end) {
c->code_word |= *c->buffer++ << -c->bits;
c->bits += 8;
}
return bit;
}
......
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