X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fcabac.c;h=b6f56f05ec618306638353f16d757755261ddc6a;hb=28e508a94677d5dffde009c5f8ca7d6a4d2ca8e8;hp=4ed6e028eb08b5e2b6ca816ec3000166c210914a;hpb=245976da2a7f9a4a03dfb6903e9437b7cf2967f4;p=ffmpeg

diff --git a/libavcodec/cabac.c b/libavcodec/cabac.c
index 4ed6e028eb0..b6f56f05ec6 100644
--- a/libavcodec/cabac.c
+++ b/libavcodec/cabac.c
@@ -2,33 +2,57 @@
  * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
- * @file cabac.c
+ * @file
  * Context Adaptive Binary Arithmetic Coder.
  */
 
 #include <string.h>
 
 #include "libavutil/common.h"
-#include "bitstream.h"
+#include "get_bits.h"
 #include "cabac.h"
+#include "cabac_functions.h"
+
+uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63] = {
+ 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,
+};
 
 static const uint8_t lps_range[64][4]= {
 {128,176,208,240}, {128,167,197,227}, {128,158,187,216}, {123,150,178,205},
@@ -49,11 +73,6 @@ static const uint8_t lps_range[64][4]= {
 {  6,  8,  9, 11}, {  6,  7,  9, 10}, {  6,  7,  8,  9}, {  2,  2,  2,  2},
 };
 
-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,
@@ -75,57 +94,13 @@ static const uint8_t lps_state[64]= {
  33,33,34,34,35,35,35,36,
  36,36,37,37,37,38,38,63,
 };
-#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,
- 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
- 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
- 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
- 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,
-};
-
-/**
- *
- * @param buf_size size of buf in bits
- */
-void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size){
-    init_put_bits(&c->pb, buf, buf_size);
-
-    c->low= 0;
-    c->range= 0x1FE;
-    c->outstanding_count= 0;
-#ifdef STRICT_LIMITS
-    c->sym_count =0;
-#endif
 
-    c->pb.bit_left++; //avoids firstBitFlag
-}
+static const uint8_t last_coeff_flag_offset_8x8[63] = {
+ 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
+ 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8
+};
 
 /**
  *
@@ -146,8 +121,13 @@ void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size){
     c->range= 0x1FE;
 }
 
-void ff_init_cabac_states(CABACContext *c){
+void ff_init_cabac_states(void)
+{
     int i, j;
+    static int initialized = 0;
+
+    if (initialized)
+        return;
 
     for(i=0; i<64; i++){
         for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save
@@ -155,112 +135,20 @@ void ff_init_cabac_states(CABACContext *c){
             ff_h264_lps_range[j*2*64+2*i+1]= lps_range[i][j];
         }
 
-        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;
+        ff_h264_mlps_state[128 + 2 * i + 0] = 2 * mps_state[i] + 0;
+        ff_h264_mlps_state[128 + 2 * i + 1] = 2 * mps_state[i] + 1;
 
         if( i ){
-#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{
             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
         }
     }
-}
-
-#ifdef TEST
-#undef random
-#define SIZE 10240
-
-#include "avcodec.h"
-#include "cabac.h"
-
-int main(void){
-    CABACContext c;
-    uint8_t b[9*SIZE];
-    uint8_t r[9*SIZE];
-    int i;
-    uint8_t state[10]= {0};
-
-    ff_init_cabac_encoder(&c, b, SIZE);
-    ff_init_cabac_states(&c);
-
-    for(i=0; i<SIZE; i++){
-        r[i]= random()%7;
-    }
-
-    for(i=0; i<SIZE; i++){
-START_TIMER
-        put_cabac_bypass(&c, r[i]&1);
-STOP_TIMER("put_cabac_bypass")
-    }
-
-    for(i=0; i<SIZE; i++){
-START_TIMER
-        put_cabac(&c, state, r[i]&1);
-STOP_TIMER("put_cabac")
-    }
-
-    for(i=0; i<SIZE; i++){
-START_TIMER
-        put_cabac_u(&c, state, r[i], 6, 3, i&1);
-STOP_TIMER("put_cabac_u")
-    }
-
-    for(i=0; i<SIZE; i++){
-START_TIMER
-        put_cabac_ueg(&c, state, r[i], 3, 0, 1, 2);
-STOP_TIMER("put_cabac_ueg")
-    }
-
-    put_cabac_terminate(&c, 1);
-
-    ff_init_cabac_decoder(&c, b, SIZE);
-
-    memset(state, 0, sizeof(state));
-
-    for(i=0; i<SIZE; i++){
-START_TIMER
-        if( (r[i]&1) != get_cabac_bypass(&c) )
-            av_log(NULL, AV_LOG_ERROR, "CABAC bypass failure at %d\n", i);
-STOP_TIMER("get_cabac_bypass")
+    for(i=0; i< 63; i++){
+      ff_h264_last_coeff_flag_offset_8x8[i] = last_coeff_flag_offset_8x8[i];
     }
 
-    for(i=0; i<SIZE; i++){
-START_TIMER
-        if( (r[i]&1) != get_cabac(&c, state) )
-            av_log(NULL, AV_LOG_ERROR, "CABAC failure at %d\n", i);
-STOP_TIMER("get_cabac")
-    }
-#if 0
-    for(i=0; i<SIZE; i++){
-START_TIMER
-        if( r[i] != get_cabac_u(&c, state, (i&1) ? 6 : 7, 3, i&1) )
-            av_log(NULL, AV_LOG_ERROR, "CABAC unary (truncated) binarization failure at %d\n", i);
-STOP_TIMER("get_cabac_u")
-    }
-
-    for(i=0; i<SIZE; i++){
-START_TIMER
-        if( r[i] != get_cabac_ueg(&c, state, 3, 0, 1, 2))
-            av_log(NULL, AV_LOG_ERROR, "CABAC unary (truncated) binarization failure at %d\n", i);
-STOP_TIMER("get_cabac_ueg")
-    }
-#endif
-    if(!get_cabac_terminate(&c))
-        av_log(NULL, AV_LOG_ERROR, "where's the Terminator?\n");
-
-    return 0;
+    initialized = 1;
 }
-
-#endif /* TEST */