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ffmpeg.wasm-core
Commit 3c2ddb59 authored by Alex Beregszaszi's avatar Alex Beregszaszi
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use get_unary from bitstream.h 

Originally committed as revision 9996 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 57d473f4
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Showing with 9 additions and 55 deletions
libavcodec/vc1.c
View file @ 3c2ddb59
...@@ -42,52 +42,6 @@ ...@@ -42,52 +42,6 @@
static const uint16_t table_mb_intra[64][2]; 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){ static inline int decode210(GetBitContext *gb){
if (get_bits1(gb)) if (get_bits1(gb))
return 0; return 0;
...@@ -1131,7 +1085,7 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb) ...@@ -1131,7 +1085,7 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
if (v->quantizer_mode == QUANT_FRAME_EXPLICIT) if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
v->pquantizer = get_bits(gb, 1); v->pquantizer = get_bits(gb, 1);
v->dquantfrm = 0; 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_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->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
v->range_x = 1 << (v->k_x - 1); v->range_x = 1 << (v->k_x - 1);
...@@ -1158,11 +1112,11 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb) ...@@ -1158,11 +1112,11 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
else v->tt_index = 2; else v->tt_index = 2;
lowquant = (v->pq > 12) ? 0 : 1; 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) if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
{ {
int scale, shift, i; 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->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6); v->lumshift = get_bits(gb, 6);
v->use_ic = 1; v->use_ic = 1;
...@@ -1305,7 +1259,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb) ...@@ -1305,7 +1259,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
v->fcm = decode012(gb); v->fcm = decode012(gb);
if(v->fcm) return -1; // interlaced frames/fields are not implemented 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: case 0:
v->s.pict_type = P_TYPE; v->s.pict_type = P_TYPE;
break; break;
...@@ -1388,7 +1342,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb) ...@@ -1388,7 +1342,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
case P_TYPE: case P_TYPE:
if(v->postprocflag) if(v->postprocflag)
v->postproc = get_bits1(gb); 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; else v->mvrange = 0;
v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13 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->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) ...@@ -1400,11 +1354,11 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
else v->tt_index = 2; else v->tt_index = 2;
lowquant = (v->pq > 12) ? 0 : 1; 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) if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
{ {
int scale, shift, i; 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->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6); v->lumshift = get_bits(gb, 6);
/* fill lookup tables for intensity compensation */ /* fill lookup tables for intensity compensation */
...@@ -1479,7 +1433,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb) ...@@ -1479,7 +1433,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
case B_TYPE: case B_TYPE:
if(v->postprocflag) if(v->postprocflag)
v->postproc = get_bits1(gb); 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; else v->mvrange = 0;
v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13 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->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, ...@@ -2350,7 +2304,7 @@ static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value,
if(!v->s.esc3_level_length) if(!v->s.esc3_level_length)
v->s.esc3_level_length = get_bits(gb, 2) + 8; v->s.esc3_level_length = get_bits(gb, 2) + 8;
} else { //table 60 } 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); v->s.esc3_run_length = 3 + get_bits(gb, 2);
} }
......
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