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Diffstat (limited to 'src/libffmpeg/libavcodec/cabac.c')
-rw-r--r--src/libffmpeg/libavcodec/cabac.c91
1 files changed, 61 insertions, 30 deletions
diff --git a/src/libffmpeg/libavcodec/cabac.c b/src/libffmpeg/libavcodec/cabac.c
index 88790a960..c6da6292a 100644
--- a/src/libffmpeg/libavcodec/cabac.c
+++ b/src/libffmpeg/libavcodec/cabac.c
@@ -2,18 +2,20 @@
* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
@@ -29,7 +31,7 @@
#include "bitstream.h"
#include "cabac.h"
-const uint8_t ff_h264_lps_range[64][4]= {
+static const uint8_t lps_range[64][4]= {
{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}, { 90,110,130,150}, { 85,104,123,142}, { 81, 99,117,135},
@@ -48,7 +50,12 @@ const uint8_t ff_h264_lps_range[64][4]= {
{ 6, 8, 9, 11}, { 6, 7, 9, 10}, { 6, 7, 8, 9}, { 2, 2, 2, 2},
};
-const uint8_t ff_h264_mps_state[64]= {
+uint8_t ff_h264_mlps_state[4*64];
+uint8_t ff_h264_lps_range[4*2*64];
+uint8_t ff_h264_lps_state[2*64];
+uint8_t ff_h264_mps_state[2*64];
+
+static const uint8_t mps_state[64]= {
1, 2, 3, 4, 5, 6, 7, 8,
9,10,11,12,13,14,15,16,
17,18,19,20,21,22,23,24,
@@ -59,7 +66,7 @@ const uint8_t ff_h264_mps_state[64]= {
57,58,59,60,61,62,62,63,
};
-const uint8_t ff_h264_lps_state[64]= {
+static const uint8_t lps_state[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,
@@ -69,25 +76,40 @@ const uint8_t ff_h264_lps_state[64]= {
33,33,34,34,35,35,35,36,
36,36,37,37,37,38,38,63,
};
-
-const uint8_t ff_h264_norm_shift[256]= {
- 8,7,6,6,5,5,5,5,4,4,4,4,4,4,4,4,
- 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
- 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+#if 0
+const uint8_t ff_h264_norm_shift_old[128]= {
+ 7,6,5,5,4,4,4,4,3,3,3,3,3,3,3,3,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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,
- 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,
- 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,
- 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,
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,
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,
};
+#endif
+const uint8_t ff_h264_norm_shift[512]= {
+ 9,8,7,7,6,6,6,6,5,5,5,5,5,5,5,5,
+ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+ 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
+ 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
+ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+};
/**
*
@@ -122,28 +144,37 @@ void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size){
c->low = (*c->bytestream++)<<10;
#endif
c->low+= ((*c->bytestream++)<<2) + 2;
- c->range= 0x1FE<<(CABAC_BITS + 1);
+ c->range= 0x1FE;
}
-void ff_init_cabac_states(CABACContext *c, uint8_t const (*lps_range)[4],
- uint8_t const *mps_state, uint8_t const *lps_state, int state_count){
+void ff_init_cabac_states(CABACContext *c){
int i, j;
- for(i=0; i<state_count; i++){
+ for(i=0; i<64; i++){
for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save
- c->lps_range[2*i+0][j+4]=
- c->lps_range[2*i+1][j+4]= lps_range[i][j];
+ ff_h264_lps_range[j*2*64+2*i+0]=
+ ff_h264_lps_range[j*2*64+2*i+1]= lps_range[i][j];
}
- c->mps_state[2*i+0]= 2*mps_state[i];
- c->mps_state[2*i+1]= 2*mps_state[i]+1;
+ ff_h264_mlps_state[128+2*i+0]=
+ ff_h264_mps_state[2*i+0]= 2*mps_state[i]+0;
+ ff_h264_mlps_state[128+2*i+1]=
+ ff_h264_mps_state[2*i+1]= 2*mps_state[i]+1;
if( i ){
- c->lps_state[2*i+0]= 2*lps_state[i];
- c->lps_state[2*i+1]= 2*lps_state[i]+1;
+#ifdef BRANCHLESS_CABAC_DECODER
+ ff_h264_mlps_state[128-2*i-1]= 2*lps_state[i]+0;
+ ff_h264_mlps_state[128-2*i-2]= 2*lps_state[i]+1;
}else{
- c->lps_state[2*i+0]= 1;
- c->lps_state[2*i+1]= 0;
+ ff_h264_mlps_state[128-2*i-1]= 1;
+ ff_h264_mlps_state[128-2*i-2]= 0;
+#else
+ ff_h264_lps_state[2*i+0]= 2*lps_state[i]+0;
+ ff_h264_lps_state[2*i+1]= 2*lps_state[i]+1;
+ }else{
+ ff_h264_lps_state[2*i+0]= 1;
+ ff_h264_lps_state[2*i+1]= 0;
+#endif
}
}
}
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