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use get_unary from bitstream.h

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Originally committed as revision 9996 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Beregszaszi 2007-08-08 22:54:47 +00:00
parent 57d473f457
commit 3c2ddb5920
1 changed files with 9 additions and 55 deletions
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64
libavcodec/vc1.c
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@ -42,52 +42,6 @@
static const uint16_t table_mb_intra[64][2];
/**
* Get unary code of limited length
* @todo FIXME Slow and ugly
* @param gb GetBitContext
* @param[in] stop The bitstop value (unary code of 1's or 0's)
* @param[in] len Maximum length
* @return Unary length/index
*/
static int get_prefix(GetBitContext *gb, int stop, int len)
{
#if 1
int i;
for(i = 0; i < len && get_bits1(gb) != stop; i++);
return i;
/* int i = 0, tmp = !stop;
while (i != len && tmp != stop)
{
tmp = get_bits(gb, 1);
i++;
}
if (i == len && tmp != stop) return len+1;
return i;*/
#else
unsigned int buf;
int log;
OPEN_READER(re, gb);
UPDATE_CACHE(re, gb);
buf=GET_CACHE(re, gb); //Still not sure
if (stop) buf = ~buf;
log= av_log2(-buf); //FIXME: -?
if (log < limit){
LAST_SKIP_BITS(re, gb, log+1);
CLOSE_READER(re, gb);
return log;
}
LAST_SKIP_BITS(re, gb, limit);
CLOSE_READER(re, gb);
return limit;
#endif
}
static inline int decode210(GetBitContext *gb){
if (get_bits1(gb))
return 0;
@ -1131,7 +1085,7 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
v->pquantizer = get_bits(gb, 1);
v->dquantfrm = 0;
if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);
if (v->extended_mv == 1) v->mvrange = get_unary(gb, 0, 3);
v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
v->range_x = 1 << (v->k_x - 1);
@ -1158,11 +1112,11 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
else v->tt_index = 2;
lowquant = (v->pq > 12) ? 0 : 1;
v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];
v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];
if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
{
int scale, shift, i;
v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];
v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];
v->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6);
v->use_ic = 1;
@ -1305,7 +1259,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
v->fcm = decode012(gb);
if(v->fcm) return -1; // interlaced frames/fields are not implemented
}
switch(get_prefix(gb, 0, 4)) {
switch(get_unary(gb, 0, 4)) {
case 0:
v->s.pict_type = P_TYPE;
break;
@ -1388,7 +1342,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
case P_TYPE:
if(v->postprocflag)
v->postproc = get_bits1(gb);
if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);
if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);
else v->mvrange = 0;
v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
@ -1400,11 +1354,11 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
else v->tt_index = 2;
lowquant = (v->pq > 12) ? 0 : 1;
v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];
v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];
if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
{
int scale, shift, i;
v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];
v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];
v->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6);
/* fill lookup tables for intensity compensation */
@ -1479,7 +1433,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
case B_TYPE:
if(v->postprocflag)
v->postproc = get_bits1(gb);
if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);
if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);
else v->mvrange = 0;
v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
@ -2350,7 +2304,7 @@ static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value,
if(!v->s.esc3_level_length)
v->s.esc3_level_length = get_bits(gb, 2) + 8;
} else { //table 60
v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;
v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;
}
v->s.esc3_run_length = 3 + get_bits(gb, 2);
}