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annotate libavcodec/cell/cabac_spu.c @ 7:c8259123d224

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author Nina Engelhardt <nengel@mailbox.tu-berlin.de>
date Wed, 15 May 2013 15:26:14 +0200
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nengel@2 1 /*
nengel@2 2 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
nengel@2 3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
nengel@2 4 *
nengel@2 5 * This file is part of FFmpeg.
nengel@2 6 *
nengel@2 7 * FFmpeg is free software; you can redistribute it and/or
nengel@2 8 * modify it under the terms of the GNU Lesser General Public
nengel@2 9 * License as published by the Free Software Foundation; either
nengel@2 10 * version 2.1 of the License, or (at your option) any later version.
nengel@2 11 *
nengel@2 12 * FFmpeg is distributed in the hope that it will be useful,
nengel@2 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
nengel@2 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
nengel@2 15 * Lesser General Public License for more details.
nengel@2 16 *
nengel@2 17 * You should have received a copy of the GNU Lesser General Public
nengel@2 18 * License along with FFmpeg; if not, write to the Free Software
nengel@2 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
nengel@2 20 */
nengel@2 21
nengel@2 22 /**
nengel@2 23 * @file
nengel@2 24 * Context Adaptive Binary Arithmetic Coder.
nengel@2 25 */
nengel@2 26
nengel@2 27 #include <string.h>
nengel@2 28
nengel@2 29 #include "libavutil/common.h"
nengel@2 30 //#include "get_bits.h"
nengel@2 31 #include "cabac_spu.h"
nengel@2 32 #define av_log(...)
nengel@2 33
nengel@2 34 int bytecount =0;
nengel@2 35 static const uint8_t lps_range[64][4]= {
nengel@2 36 {128,176,208,240}, {128,167,197,227}, {128,158,187,216}, {123,150,178,205},
nengel@2 37 {116,142,169,195}, {111,135,160,185}, {105,128,152,175}, {100,122,144,166},
nengel@2 38 { 95,116,137,158}, { 90,110,130,150}, { 85,104,123,142}, { 81, 99,117,135},
nengel@2 39 { 77, 94,111,128}, { 73, 89,105,122}, { 69, 85,100,116}, { 66, 80, 95,110},
nengel@2 40 { 62, 76, 90,104}, { 59, 72, 86, 99}, { 56, 69, 81, 94}, { 53, 65, 77, 89},
nengel@2 41 { 51, 62, 73, 85}, { 48, 59, 69, 80}, { 46, 56, 66, 76}, { 43, 53, 63, 72},
nengel@2 42 { 41, 50, 59, 69}, { 39, 48, 56, 65}, { 37, 45, 54, 62}, { 35, 43, 51, 59},
nengel@2 43 { 33, 41, 48, 56}, { 32, 39, 46, 53}, { 30, 37, 43, 50}, { 29, 35, 41, 48},
nengel@2 44 { 27, 33, 39, 45}, { 26, 31, 37, 43}, { 24, 30, 35, 41}, { 23, 28, 33, 39},
nengel@2 45 { 22, 27, 32, 37}, { 21, 26, 30, 35}, { 20, 24, 29, 33}, { 19, 23, 27, 31},
nengel@2 46 { 18, 22, 26, 30}, { 17, 21, 25, 28}, { 16, 20, 23, 27}, { 15, 19, 22, 25},
nengel@2 47 { 14, 18, 21, 24}, { 14, 17, 20, 23}, { 13, 16, 19, 22}, { 12, 15, 18, 21},
nengel@2 48 { 12, 14, 17, 20}, { 11, 14, 16, 19}, { 11, 13, 15, 18}, { 10, 12, 15, 17},
nengel@2 49 { 10, 12, 14, 16}, { 9, 11, 13, 15}, { 9, 11, 12, 14}, { 8, 10, 12, 14},
nengel@2 50 { 8, 9, 11, 13}, { 7, 9, 11, 12}, { 7, 9, 10, 12}, { 7, 8, 10, 11},
nengel@2 51 { 6, 8, 9, 11}, { 6, 7, 9, 10}, { 6, 7, 8, 9}, { 2, 2, 2, 2},
nengel@2 52 };
nengel@2 53
nengel@2 54 uint8_t ff_h264_mlps_state[4*64];
nengel@2 55 uint8_t ff_h264_lps_range[4*2*64];
nengel@2 56 uint8_t ff_h264_lps_state[2*64];
nengel@2 57 uint8_t ff_h264_mps_state[2*64];
nengel@2 58
nengel@2 59 static const uint8_t mps_state[64]= {
nengel@2 60 1, 2, 3, 4, 5, 6, 7, 8,
nengel@2 61 9,10,11,12,13,14,15,16,
nengel@2 62 17,18,19,20,21,22,23,24,
nengel@2 63 25,26,27,28,29,30,31,32,
nengel@2 64 33,34,35,36,37,38,39,40,
nengel@2 65 41,42,43,44,45,46,47,48,
nengel@2 66 49,50,51,52,53,54,55,56,
nengel@2 67 57,58,59,60,61,62,62,63,
nengel@2 68 };
nengel@2 69
nengel@2 70 static const uint8_t lps_state[64]= {
nengel@2 71 0, 0, 1, 2, 2, 4, 4, 5,
nengel@2 72 6, 7, 8, 9, 9,11,11,12,
nengel@2 73 13,13,15,15,16,16,18,18,
nengel@2 74 19,19,21,21,22,22,23,24,
nengel@2 75 24,25,26,26,27,27,28,29,
nengel@2 76 29,30,30,30,31,32,32,33,
nengel@2 77 33,33,34,34,35,35,35,36,
nengel@2 78 36,36,37,37,37,38,38,63,
nengel@2 79 };
nengel@2 80
nengel@2 81 const uint8_t ff_h264_norm_shift[512]= {
nengel@2 82 9,8,7,7,6,6,6,6,5,5,5,5,5,5,5,5,
nengel@2 83 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
nengel@2 84 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
nengel@2 85 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
nengel@2 86 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
nengel@2 87 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
nengel@2 88 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
nengel@2 89 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
nengel@2 90 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
nengel@2 91 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
nengel@2 92 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
nengel@2 93 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
nengel@2 94 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,
nengel@2 95 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,
nengel@2 96 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,
nengel@2 97 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,
nengel@2 98 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,
nengel@2 99 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,
nengel@2 100 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,
nengel@2 101 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,
nengel@2 102 };
nengel@2 103
nengel@2 104 /**
nengel@2 105 *
nengel@2 106 * @param buf_size size of buf in bits
nengel@2 107 */
nengel@2 108
nengel@2 109 void ff_init_cabac_states(){
nengel@2 110 int i, j;
nengel@2 111
nengel@2 112 for(i=0; i<64; i++){
nengel@2 113 for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save
nengel@2 114 ff_h264_lps_range[j*2*64+2*i+0]=
nengel@2 115 ff_h264_lps_range[j*2*64+2*i+1]= lps_range[i][j];
nengel@2 116 }
nengel@2 117
nengel@2 118 ff_h264_mlps_state[128+2*i+0]=
nengel@2 119 ff_h264_mps_state[2*i+0]= 2*mps_state[i]+0;
nengel@2 120 ff_h264_mlps_state[128+2*i+1]=
nengel@2 121 ff_h264_mps_state[2*i+1]= 2*mps_state[i]+1;
nengel@2 122
nengel@2 123 if( i ){
nengel@2 124 #ifdef BRANCHLESS_CABAC_DECODER
nengel@2 125 ff_h264_mlps_state[128-2*i-1]= 2*lps_state[i]+0;
nengel@2 126 ff_h264_mlps_state[128-2*i-2]= 2*lps_state[i]+1;
nengel@2 127 }else{
nengel@2 128 ff_h264_mlps_state[128-2*i-1]= 1;
nengel@2 129 ff_h264_mlps_state[128-2*i-2]= 0;
nengel@2 130 #else
nengel@2 131 ff_h264_lps_state[2*i+0]= 2*lps_state[i]+0;
nengel@2 132 ff_h264_lps_state[2*i+1]= 2*lps_state[i]+1;
nengel@2 133 }else{
nengel@2 134 ff_h264_lps_state[2*i+0]= 1;
nengel@2 135 ff_h264_lps_state[2*i+1]= 0;
nengel@2 136 #endif
nengel@2 137 }
nengel@2 138 }
nengel@2 139 }
nengel@2 140