/*****************************************************************************
* cabac.c: h264 encoder library
*****************************************************************************
- * Copyright (C) 2003 Laurent Aimar
- * $Id: cabac.c,v 1.1 2004/06/03 19:27:06 fenrir Exp $
+ * Copyright (C) 2003-2008 x264 project
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ * Loren Merritt <lorenm@u.washington.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
*****************************************************************************/
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-
#include "common.h"
-//#define TRACE 1
-
-/* Debugging purpose ONLY !!!! */
-#ifdef TRACE
-static int binCount = 0;
-#endif
-
-static const int x264_cabac_context_init_I[460][2] =
+static const int8_t x264_cabac_context_init_I[460][2] =
{
/* 0 - 10 */
{ 20, -15 }, { 2, 54 }, { 3, 74 }, { 20, -15 },
{ 2, 54 }, { 3, 74 }, { -28,127 }, { -23, 104 },
{ -6, 53 }, { -1, 54 }, { 7, 51 },
- /* 11 - 23 unsused for I */
+ /* 11 - 23 unused for I */
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
{ 29, 9 }, { 35, 20 }, { 29, 36 }, { 14, 67 }
};
-static const int x264_cabac_context_init_PB[3][460][2] =
+static const int8_t x264_cabac_context_init_PB[3][460][2] =
{
/* i_cabac_init_idc == 0 */
{
}
};
-static const int x264_cabac_range_lps[64][4] =
+/* FIXME could avoid this duplication by reversing the order of states
+ * with MPS=0, but that would uglify the other tables */
+const uint8_t x264_cabac_range_lps[128][4] =
{
+ { 2, 2, 2, 2 },
+ { 6, 7, 8, 9 }, { 6, 7, 9, 10 }, { 6, 8, 9, 11 },
+ { 7, 8, 10, 11 }, { 7, 9, 10, 12 }, { 7, 9, 11, 12 },
+ { 8, 9, 11, 13 }, { 8, 10, 12, 14 }, { 9, 11, 12, 14 },
+ { 9, 11, 13, 15 }, { 10, 12, 14, 16 }, { 10, 12, 15, 17 },
+ { 11, 13, 15, 18 }, { 11, 14, 16, 19 }, { 12, 14, 17, 20 },
+ { 12, 15, 18, 21 }, { 13, 16, 19, 22 }, { 14, 17, 20, 23 },
+ { 14, 18, 21, 24 }, { 15, 19, 22, 25 }, { 16, 20, 23, 27 },
+ { 17, 21, 25, 28 }, { 18, 22, 26, 30 }, { 19, 23, 27, 31 },
+ { 20, 24, 29, 33 }, { 21, 26, 30, 35 }, { 22, 27, 32, 37 },
+ { 23, 28, 33, 39 }, { 24, 30, 35, 41 }, { 26, 31, 37, 43 },
+ { 27, 33, 39, 45 }, { 29, 35, 41, 48 }, { 30, 37, 43, 50 },
+ { 32, 39, 46, 53 }, { 33, 41, 48, 56 }, { 35, 43, 51, 59 },
+ { 37, 45, 54, 62 }, { 39, 48, 56, 65 }, { 41, 50, 59, 69 },
+ { 43, 53, 63, 72 }, { 46, 56, 66, 76 }, { 48, 59, 69, 80 },
+ { 51, 62, 73, 85 }, { 53, 65, 77, 89 }, { 56, 69, 81, 94 },
+ { 59, 72, 86, 99 }, { 62, 76, 90, 104 }, { 66, 80, 95, 110 },
+ { 69, 85, 100, 116 }, { 73, 89, 105, 122 }, { 77, 94, 111, 128 },
+ { 81, 99, 117, 135 }, { 85, 104, 123, 142 }, { 90, 110, 130, 150 },
+ { 95, 116, 137, 158 }, { 100, 122, 144, 166 }, { 105, 128, 152, 175 },
+ { 111, 135, 160, 185 }, { 116, 142, 169, 195 }, { 123, 150, 178, 205 },
+ { 128, 158, 187, 216 }, { 128, 167, 197, 227 }, { 128, 176, 208, 240 },
+
{ 128, 176, 208, 240 }, { 128, 167, 197, 227 }, { 128, 158, 187, 216 },
{ 123, 150, 178, 205 }, { 116, 142, 169, 195 }, { 111, 135, 160, 185 },
{ 105, 128, 152, 175 }, { 100, 122, 144, 166 }, { 95, 116, 137, 158 },
{ 2, 2, 2, 2 },
};
-static const int x264_transition_lps[64] =
-{
- 0, 0, 1, 2, 2, 4, 4, 5, 6, 7, 8, 9, 9,11,11,12,
- 13,13,15,15,16,16,18,18,19,19,21,21,22,22,23,24,
- 24,25,26,26,27,27,28,29,29,30,30,30,31,32,32,33,
- 33,33,34,34,35,35,35,36,36,36,37,37,37,38,38,63
-};
-static const int x264_transition_mps[64] =
+const uint8_t x264_cabac_transition[128][2] =
{
- 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,
- 17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
- 33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
- 49,50,51,52,53,54,55,56,57,58,59,60,61,62,62,63,
+ { 0, 0}, { 1, 25}, { 1, 25}, { 2, 26}, { 3, 26}, { 4, 26}, { 5, 27}, { 6, 27},
+ { 7, 27}, { 8, 28}, { 9, 28}, { 10, 28}, { 11, 29}, { 12, 29}, { 13, 30}, { 14, 30},
+ { 15, 30}, { 16, 31}, { 17, 31}, { 18, 32}, { 19, 33}, { 20, 33}, { 21, 33}, { 22, 34},
+ { 23, 34}, { 24, 35}, { 25, 36}, { 26, 36}, { 27, 37}, { 28, 37}, { 29, 38}, { 30, 39},
+ { 31, 39}, { 32, 40}, { 33, 41}, { 34, 41}, { 35, 42}, { 36, 42}, { 37, 44}, { 38, 44},
+ { 39, 45}, { 40, 45}, { 41, 47}, { 42, 47}, { 43, 48}, { 44, 48}, { 45, 50}, { 46, 50},
+ { 47, 51}, { 48, 52}, { 49, 52}, { 50, 54}, { 51, 54}, { 52, 55}, { 53, 56}, { 54, 57},
+ { 55, 58}, { 56, 59}, { 57, 59}, { 58, 61}, { 59, 61}, { 60, 62}, { 61, 63}, { 62, 64},
+ { 63, 65}, { 64, 66}, { 65, 67}, { 66, 68}, { 66, 69}, { 68, 70}, { 68, 71}, { 69, 72},
+ { 70, 73}, { 71, 74}, { 72, 75}, { 73, 76}, { 73, 77}, { 75, 78}, { 75, 79}, { 76, 80},
+ { 77, 81}, { 77, 82}, { 79, 83}, { 79, 84}, { 80, 85}, { 80, 86}, { 82, 87}, { 82, 88},
+ { 83, 89}, { 83, 90}, { 85, 91}, { 85, 92}, { 86, 93}, { 86, 94}, { 87, 95}, { 88, 96},
+ { 88, 97}, { 89, 98}, { 90, 99}, { 90,100}, { 91,101}, { 91,102}, { 92,103}, { 93,104},
+ { 93,105}, { 94,106}, { 94,107}, { 94,108}, { 95,109}, { 96,110}, { 96,111}, { 97,112},
+ { 97,113}, { 97,114}, { 98,115}, { 98,116}, { 99,117}, { 99,118}, { 99,119}, {100,120},
+ {100,121}, {100,122}, {101,123}, {101,124}, {101,125}, {102,126}, {102,126}, {127,127},
};
-static const int x264_cabac_probability[128] =
-{
- FIX8(0.9812), FIX8(0.9802), FIX8(0.9792), FIX8(0.9781),
- FIX8(0.9769), FIX8(0.9757), FIX8(0.9744), FIX8(0.9730),
- FIX8(0.9716), FIX8(0.9700), FIX8(0.9684), FIX8(0.9667),
- FIX8(0.9650), FIX8(0.9631), FIX8(0.9611), FIX8(0.9590),
- FIX8(0.9568), FIX8(0.9545), FIX8(0.9521), FIX8(0.9495),
- FIX8(0.9468), FIX8(0.9440), FIX8(0.9410), FIX8(0.9378),
- FIX8(0.9345), FIX8(0.9310), FIX8(0.9273), FIX8(0.9234),
- FIX8(0.9193), FIX8(0.9150), FIX8(0.9105), FIX8(0.9057),
- FIX8(0.9006), FIX8(0.8953), FIX8(0.8897), FIX8(0.8838),
- FIX8(0.8776), FIX8(0.8710), FIX8(0.8641), FIX8(0.8569),
- FIX8(0.8492), FIX8(0.8411), FIX8(0.8326), FIX8(0.8237),
- FIX8(0.8143), FIX8(0.8043), FIX8(0.7938), FIX8(0.7828),
- FIX8(0.7712), FIX8(0.7590), FIX8(0.7461), FIX8(0.7325),
- FIX8(0.7182), FIX8(0.7031), FIX8(0.6872), FIX8(0.6705),
- FIX8(0.6528), FIX8(0.6343), FIX8(0.6147), FIX8(0.5941),
- FIX8(0.5724), FIX8(0.5495), FIX8(0.5254), FIX8(0.5000),
- FIX8(0.5000), FIX8(0.4746), FIX8(0.4505), FIX8(0.4276),
- FIX8(0.4059), FIX8(0.3853), FIX8(0.3657), FIX8(0.3472),
- FIX8(0.3295), FIX8(0.3128), FIX8(0.2969), FIX8(0.2818),
- FIX8(0.2675), FIX8(0.2539), FIX8(0.2410), FIX8(0.2288),
- FIX8(0.2172), FIX8(0.2062), FIX8(0.1957), FIX8(0.1857),
- FIX8(0.1763), FIX8(0.1674), FIX8(0.1589), FIX8(0.1508),
- FIX8(0.1431), FIX8(0.1359), FIX8(0.1290), FIX8(0.1224),
- FIX8(0.1162), FIX8(0.1103), FIX8(0.1047), FIX8(0.0994),
- FIX8(0.0943), FIX8(0.0895), FIX8(0.0850), FIX8(0.0807),
- FIX8(0.0766), FIX8(0.0727), FIX8(0.0690), FIX8(0.0655),
- FIX8(0.0622), FIX8(0.0590), FIX8(0.0560), FIX8(0.0532),
- FIX8(0.0505), FIX8(0.0479), FIX8(0.0455), FIX8(0.0432),
- FIX8(0.0410), FIX8(0.0389), FIX8(0.0369), FIX8(0.0350),
- FIX8(0.0333), FIX8(0.0316), FIX8(0.0300), FIX8(0.0284),
- FIX8(0.0270), FIX8(0.0256), FIX8(0.0243), FIX8(0.0231),
- FIX8(0.0219), FIX8(0.0208), FIX8(0.0198), FIX8(0.0187)
+const uint8_t x264_cabac_renorm_shift[64]= {
+ 6,5,4,4,3,3,3,3,2,2,2,2,2,2,2,2,
+ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
};
+
/* -ln2(probability) */
-static const int x264_cabac_entropy[128] =
+#define F(a,b) {FIX8(a),FIX8(b)}
+const uint16_t x264_cabac_entropy[128][2] =
{
- FIX8(0.0273), FIX8(0.0288), FIX8(0.0303), FIX8(0.0320),
- FIX8(0.0337), FIX8(0.0355), FIX8(0.0375), FIX8(0.0395),
- FIX8(0.0416), FIX8(0.0439), FIX8(0.0463), FIX8(0.0488),
- FIX8(0.0515), FIX8(0.0543), FIX8(0.0572), FIX8(0.0604),
- FIX8(0.0637), FIX8(0.0671), FIX8(0.0708), FIX8(0.0747),
- FIX8(0.0788), FIX8(0.0832), FIX8(0.0878), FIX8(0.0926),
- FIX8(0.0977), FIX8(0.1032), FIX8(0.1089), FIX8(0.1149),
- FIX8(0.1214), FIX8(0.1282), FIX8(0.1353), FIX8(0.1429),
- FIX8(0.1510), FIX8(0.1596), FIX8(0.1686), FIX8(0.1782),
- FIX8(0.1884), FIX8(0.1992), FIX8(0.2107), FIX8(0.2229),
- FIX8(0.2358), FIX8(0.2496), FIX8(0.2642), FIX8(0.2798),
- FIX8(0.2964), FIX8(0.3142), FIX8(0.3331), FIX8(0.3532),
- FIX8(0.3748), FIX8(0.3979), FIX8(0.4226), FIX8(0.4491),
- FIX8(0.4776), FIX8(0.5082), FIX8(0.5412), FIX8(0.5768),
- FIX8(0.6152), FIX8(0.6568), FIX8(0.7020), FIX8(0.7513),
- FIX8(0.8050), FIX8(0.8638), FIX8(0.9285), FIX8(1.0000),
- FIX8(1.0000), FIX8(1.0752), FIX8(1.1504), FIX8(1.2256),
- FIX8(1.3008), FIX8(1.3759), FIX8(1.4511), FIX8(1.5263),
- FIX8(1.6015), FIX8(1.6767), FIX8(1.7519), FIX8(1.8271),
- FIX8(1.9023), FIX8(1.9775), FIX8(2.0527), FIX8(2.1278),
- FIX8(2.2030), FIX8(2.2782), FIX8(2.3534), FIX8(2.4286),
- FIX8(2.5038), FIX8(2.5790), FIX8(2.6542), FIX8(2.7294),
- FIX8(2.8046), FIX8(2.8797), FIX8(2.9549), FIX8(3.0301),
- FIX8(3.1053), FIX8(3.1805), FIX8(3.2557), FIX8(3.3309),
- FIX8(3.4061), FIX8(3.4813), FIX8(3.5565), FIX8(3.6316),
- FIX8(3.7068), FIX8(3.7820), FIX8(3.8572), FIX8(3.9324),
- FIX8(4.0076), FIX8(4.0828), FIX8(4.1580), FIX8(4.2332),
- FIX8(4.3083), FIX8(4.3836), FIX8(4.4588), FIX8(4.5339),
- FIX8(4.6091), FIX8(4.6843), FIX8(4.7595), FIX8(4.8347),
- FIX8(4.9099), FIX8(4.9851), FIX8(5.0602), FIX8(5.1354),
- FIX8(5.2106), FIX8(5.2859), FIX8(5.3610), FIX8(5.4362),
- FIX8(5.5114), FIX8(5.5866), FIX8(5.6618), FIX8(5.7370)
+ F(0.0273,5.7370), F(0.0288,5.6618), F(0.0303,5.5866), F(0.0320,5.5114),
+ F(0.0337,5.4362), F(0.0355,5.3610), F(0.0375,5.2859), F(0.0395,5.2106),
+ F(0.0416,5.1354), F(0.0439,5.0602), F(0.0463,4.9851), F(0.0488,4.9099),
+ F(0.0515,4.8347), F(0.0543,4.7595), F(0.0572,4.6843), F(0.0604,4.6091),
+ F(0.0637,4.5339), F(0.0671,4.4588), F(0.0708,4.3836), F(0.0747,4.3083),
+ F(0.0788,4.2332), F(0.0832,4.1580), F(0.0878,4.0828), F(0.0926,4.0076),
+ F(0.0977,3.9324), F(0.1032,3.8572), F(0.1089,3.7820), F(0.1149,3.7068),
+ F(0.1214,3.6316), F(0.1282,3.5565), F(0.1353,3.4813), F(0.1429,3.4061),
+ F(0.1510,3.3309), F(0.1596,3.2557), F(0.1686,3.1805), F(0.1782,3.1053),
+ F(0.1884,3.0301), F(0.1992,2.9549), F(0.2107,2.8797), F(0.2229,2.8046),
+ F(0.2358,2.7294), F(0.2496,2.6542), F(0.2642,2.5790), F(0.2798,2.5038),
+ F(0.2964,2.4286), F(0.3142,2.3534), F(0.3331,2.2782), F(0.3532,2.2030),
+ F(0.3748,2.1278), F(0.3979,2.0527), F(0.4226,1.9775), F(0.4491,1.9023),
+ F(0.4776,1.8271), F(0.5082,1.7519), F(0.5412,1.6767), F(0.5768,1.6015),
+ F(0.6152,1.5263), F(0.6568,1.4511), F(0.7020,1.3759), F(0.7513,1.3008),
+ F(0.8050,1.2256), F(0.8638,1.1504), F(0.9285,1.0752), F(1.0000,1.0000),
+ F(1.0000,1.0000), F(1.0752,0.9285), F(1.1504,0.8638), F(1.2256,0.8050),
+ F(1.3008,0.7513), F(1.3759,0.7020), F(1.4511,0.6568), F(1.5263,0.6152),
+ F(1.6015,0.5768), F(1.6767,0.5412), F(1.7519,0.5082), F(1.8271,0.4776),
+ F(1.9023,0.4491), F(1.9775,0.4226), F(2.0527,0.3979), F(2.1278,0.3748),
+ F(2.2030,0.3532), F(2.2782,0.3331), F(2.3534,0.3142), F(2.4286,0.2964),
+ F(2.5038,0.2798), F(2.5790,0.2642), F(2.6542,0.2496), F(2.7294,0.2358),
+ F(2.8046,0.2229), F(2.8797,0.2107), F(2.9549,0.1992), F(3.0301,0.1884),
+ F(3.1053,0.1782), F(3.1805,0.1686), F(3.2557,0.1596), F(3.3309,0.1510),
+ F(3.4061,0.1429), F(3.4813,0.1353), F(3.5565,0.1282), F(3.6316,0.1214),
+ F(3.7068,0.1149), F(3.7820,0.1089), F(3.8572,0.1032), F(3.9324,0.0977),
+ F(4.0076,0.0926), F(4.0828,0.0878), F(4.1580,0.0832), F(4.2332,0.0788),
+ F(4.3083,0.0747), F(4.3836,0.0708), F(4.4588,0.0671), F(4.5339,0.0637),
+ F(4.6091,0.0604), F(4.6843,0.0572), F(4.7595,0.0543), F(4.8347,0.0515),
+ F(4.9099,0.0488), F(4.9851,0.0463), F(5.0602,0.0439), F(5.1354,0.0416),
+ F(5.2106,0.0395), F(5.2859,0.0375), F(5.3610,0.0355), F(5.4362,0.0337),
+ F(5.5114,0.0320), F(5.5866,0.0303), F(5.6618,0.0288), F(5.7370,0.0273),
};
*****************************************************************************/
void x264_cabac_context_init( x264_cabac_t *cb, int i_slice_type, int i_qp, int i_model )
{
- const int (*cabac_context_init)[460][2];
+ const int8_t (*cabac_context_init)[460][2];
int i;
if( i_slice_type == SLICE_TYPE_I )
cabac_context_init = &x264_cabac_context_init_PB[i_model];
}
- for( i = 0; i < 436; i++ )
+ for( i = 0; i < 460; i++ )
{
- int i_pre_state;
-
- i_pre_state = x264_clip3( (((*cabac_context_init)[i][0] * i_qp) >> 4) + (*cabac_context_init)[i][1], 1, 126 );
- if( i_pre_state <= 63 )
- {
- cb->ctxstate[i].i_state = 63 - i_pre_state;
- cb->ctxstate[i].i_mps = 0;
- }
- else
- {
- cb->ctxstate[i].i_state = i_pre_state - 64;
- cb->ctxstate[i].i_mps = 1;
- }
+ cb->state[i] = x264_clip3( (((*cabac_context_init)[i][0] * i_qp) >> 4) + (*cabac_context_init)[i][1], 1, 126 );
}
}
-/*****************************************************************************
- *
- *****************************************************************************/
-void x264_cabac_decode_init( x264_cabac_t *cb, bs_t *s )
-{
- cb->i_range = 0x01fe;
- cb->i_low = bs_read( s, 9 );
- cb->s = s;
-}
-
-static inline void x264_cabac_decode_renorm( x264_cabac_t *cb )
-{
- while( cb->i_range < 0x0100 )
- {
- cb->i_range <<= 1;
- cb->i_low = ( cb->i_low << 1 )|bs_read( cb->s, 1 );
- }
-}
-
-int x264_cabac_decode_decision( x264_cabac_t *cb, int i_ctx )
-{
- int i_state = cb->ctxstate[i_ctx].i_state;
- int i_mps = cb->ctxstate[i_ctx].i_mps;
-
- int i_range_lps = x264_cabac_range_lps[i_state][(cb->i_range>>6)&0x03];
-
- int val;
-
- cb->i_range -= i_range_lps;
-
- if( cb->i_low >= cb->i_range )
- {
- val = 1 - i_mps;
-
- cb->i_low -= cb->i_range;
- cb->i_range= i_range_lps;
-
- if( i_state == 0 )
- {
- cb->ctxstate[i_ctx].i_mps = 1 - i_mps;
- }
- cb->ctxstate[i_ctx].i_state = x264_transition_lps[i_state];
- }
- else
- {
- val = i_mps;
-
- cb->ctxstate[i_ctx].i_state = x264_transition_mps[i_state];
- }
-
- x264_cabac_decode_renorm( cb );
-
- return val;
-}
-int x264_cabac_decode_bypass( x264_cabac_t *cb )
-{
- cb->i_low = (cb->i_low << 1)|bs_read( cb->s, 1 );
-
- if( cb->i_low >= cb->i_range )
- {
- cb->i_low -= cb->i_range;
- return 1;
- }
- return 0;
-}
-int x264_cabac_decode_terminal( x264_cabac_t *cb )
-{
- if( cb->i_low >= cb->i_range - 2 )
- {
- return 1;
- }
-
- cb->i_range -= 2;
- x264_cabac_decode_renorm( cb );
- return 0;
-}
-
-/*****************************************************************************
- *
- *****************************************************************************/
-void x264_cabac_encode_init( x264_cabac_t *cb, bs_t *s )
+void x264_cabac_encode_init( x264_cabac_t *cb, uint8_t *p_data, uint8_t *p_end )
{
cb->i_low = 0;
cb->i_range = 0x01FE;
- cb->b_first_bit= 1;
- cb->i_bits_outstanding = 0;
- cb->s = s;
+ cb->i_queue = -1; // the first bit will be shifted away and not written
+ cb->i_bytes_outstanding = 0;
+ cb->p_start = p_data;
+ cb->p = p_data;
+ cb->p_end = p_end;
}
-static inline void x264_cabac_putbit( x264_cabac_t *cb, int b )
+static inline void x264_cabac_putbyte( x264_cabac_t *cb )
{
- if( cb->b_first_bit )
+ if( cb->i_queue >= 8 )
{
- cb->b_first_bit = 0;
- }
- else
- {
- bs_write1( cb->s, b );
- }
-
- while( cb->i_bits_outstanding > 0 )
- {
- bs_write1( cb->s, 1 - b );
- cb->i_bits_outstanding--;
- }
-}
+ int out = cb->i_low >> (cb->i_queue+2);
+ cb->i_low &= (4<<cb->i_queue)-1;
+ cb->i_queue -= 8;
-static inline void x264_cabac_encode_renorm( x264_cabac_t *cb )
-{
- /* RenormE */
- while( cb->i_range < 0x0100 )
- {
- if( cb->i_low < 0x100 )
+ if( (out & 0xff) == 0xff )
{
- x264_cabac_putbit( cb, 0 );
+ cb->i_bytes_outstanding++;
}
else
{
- if( cb->i_low >= 0x200 )
- {
- cb->i_low -= 0x200;
- x264_cabac_putbit( cb, 1 );
- }
- else
+ int carry = out >> 8;
+ int bytes_outstanding = cb->i_bytes_outstanding;
+ // this can't modify before the beginning of the stream because
+ // that would correspond to a probability > 1.
+ // it will write before the beginning of the stream, which is ok
+ // because a slice header always comes before cabac data.
+ // this can't carry beyond the one byte, because any 0xff bytes
+ // are in bytes_outstanding and thus not written yet.
+ cb->p[-1] += carry;
+ while( bytes_outstanding > 0 )
{
- cb->i_low -= 0x100;
- cb->i_bits_outstanding++;
+ *(cb->p++) = carry-1;
+ bytes_outstanding--;
}
+ *(cb->p++) = out;
+ cb->i_bytes_outstanding = 0;
}
-
- cb->i_range <<= 1;
- cb->i_low <<= 1;
}
}
-void x264_cabac_encode_decision( x264_cabac_t *cb, int i_ctx, int b )
+static inline void x264_cabac_encode_renorm( x264_cabac_t *cb )
{
- int i_state = cb->ctxstate[i_ctx].i_state;
- int i_mps = cb->ctxstate[i_ctx].i_mps;
-
- int i_range_lps = x264_cabac_range_lps[i_state][(cb->i_range>>6)&0x03];
-
-#ifdef TRACE
- if( binCount >= 0 )
- {
- fprintf( stderr, "%d ctx=%d b=%d\n", binCount, i_ctx, b );
- }
- fprintf( stderr, "%d 0x%04x %d %d\n", binCount++, cb->i_range, i_state, i_mps );
-#endif
+ int shift = x264_cabac_renorm_shift[cb->i_range>>3];
+ cb->i_range <<= shift;
+ cb->i_low <<= shift;
+ cb->i_queue += shift;
+ x264_cabac_putbyte( cb );
+}
+/* Making custom versions of this function, even in asm, for the cases where
+ * b is known to be 0 or 1, proved to be somewhat useful on x86_32 with GCC 3.4
+ * but nearly useless with GCC 4.3 and worse than useless on x86_64. */
+void x264_cabac_encode_decision_c( x264_cabac_t *cb, int i_ctx, int b )
+{
+ int i_state = cb->state[i_ctx];
+ int i_range_lps = x264_cabac_range_lps[i_state][(cb->i_range>>6)-4];
cb->i_range -= i_range_lps;
-
- if( b != i_mps )
+ if( b != (i_state >> 6) )
{
cb->i_low += cb->i_range;
cb->i_range = i_range_lps;
-
- if( i_state == 0 )
- {
- cb->ctxstate[i_ctx].i_mps = 1 - i_mps;
- }
- cb->ctxstate[i_ctx].i_state = x264_transition_lps[i_state];
- }
- else
- {
- cb->ctxstate[i_ctx].i_state = x264_transition_mps[i_state];
}
-
+ cb->state[i_ctx] = x264_cabac_transition[i_state][b];
x264_cabac_encode_renorm( cb );
}
void x264_cabac_encode_bypass( x264_cabac_t *cb, int b )
{
-#ifdef TRACE
- fprintf( stderr, "%d 0x%04x\n", binCount++, cb->i_range );
-#endif
-
cb->i_low <<= 1;
- if( b )
- {
- cb->i_low += cb->i_range;
- }
-
- if( cb->i_low >= 0x400 )
- {
- x264_cabac_putbit( cb, 1 );
- cb->i_low -= 0x400;
- }
- else
- {
- if( cb->i_low < 0x200 )
- {
- x264_cabac_putbit( cb, 0 );
- }
- else
- {
- cb->i_low -= 0x200;
- cb->i_bits_outstanding++;
- }
- }
+ cb->i_low += -b & cb->i_range;
+ cb->i_queue += 1;
+ x264_cabac_putbyte( cb );
}
-void x264_cabac_encode_terminal( x264_cabac_t *cb, int b )
+void x264_cabac_encode_ue_bypass( x264_cabac_t *cb, int exp_bits, int val )
{
-#ifdef TRACE
- fprintf( stderr, "%d 0x%04x\n", binCount++, cb->i_range );
-#endif
-
- cb->i_range -= 2;
- if( b )
- {
- cb->i_low += cb->i_range;
- cb->i_range = 2;
- }
- x264_cabac_encode_renorm( cb );
+ int k, i;
+ uint32_t x;
+ for( k = exp_bits; val >= (1<<k); k++ )
+ val -= 1<<k;
+ x = (((1<<(k-exp_bits))-1)<<(k+1))+val;
+ k = 2*k+1-exp_bits;
+ i = ((k-1)&7)+1;
+ do {
+ k -= i;
+ cb->i_low <<= i;
+ cb->i_low += ((x>>k)&0xff) * cb->i_range;
+ cb->i_queue += i;
+ x264_cabac_putbyte( cb );
+ i = 8;
+ } while( k > 0 );
}
-void x264_cabac_encode_flush( x264_cabac_t *cb )
+void x264_cabac_encode_terminal( x264_cabac_t *cb )
{
- x264_cabac_putbit( cb, (cb->i_low >> 9)&0x01 );
- bs_write1( cb->s, (cb->i_low >> 8)&0x01 );
-
- /* check that */
- bs_write1( cb->s, 0x01 );
- bs_align_0( cb->s );
+ cb->i_range -= 2;
+ x264_cabac_encode_renorm( cb );
}
-/*****************************************************************************
- *
- *****************************************************************************/
-void x264_cabac_size_decision( x264_cabac_t *cb, int i_ctx, int b )
+void x264_cabac_encode_flush( x264_t *h, x264_cabac_t *cb )
{
- int i_state = cb->ctxstate[i_ctx].i_state;
- int i_mps = cb->ctxstate[i_ctx].i_mps;
-
- if( b != i_mps )
+ cb->i_low += cb->i_range - 2;
+ cb->i_low |= 1;
+ cb->i_low <<= 9;
+ cb->i_queue += 9;
+ x264_cabac_putbyte( cb );
+ x264_cabac_putbyte( cb );
+ cb->i_low <<= 8 - cb->i_queue;
+ cb->i_low |= (0x35a4e4f5 >> (h->i_frame & 31) & 1) << 10;
+ cb->i_queue = 8;
+ x264_cabac_putbyte( cb );
+
+ while( cb->i_bytes_outstanding > 0 )
{
- cb->ctxstate[i_ctx].i_mps ^= ( i_state == 0 );
- cb->ctxstate[i_ctx].i_state = x264_transition_lps[i_state];
- cb->f8_bits_encoded += x264_cabac_entropy[ 64 + i_state ];
- }
- else
- {
- cb->ctxstate[i_ctx].i_state = x264_transition_mps[i_state];
- cb->f8_bits_encoded += x264_cabac_entropy[ 63 - i_state ];
+ *(cb->p++) = 0xff;
+ cb->i_bytes_outstanding--;
}
}
+
projects / x264 / blobdiff