* 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 Libav.
+ *
+ * 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 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,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * 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 "common.h"
+#include "libavutil/common.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,
+};
-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},
{ 6, 8, 9, 11}, { 6, 7, 9, 10}, { 6, 7, 8, 9}, { 2, 2, 2, 2},
};
-const uint8_t ff_h264_mps_state[64]= {
+static uint8_t 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,
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,
36,36,37,37,37,38,38,63,
};
+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
+};
+
/**
*
* @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, NULL, NULL);
+ 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
}
*
* @param buf_size size of buf in bits
*/
-void ff_init_cabac_decoder(CABACContext *c, uint8_t *buf, int buf_size){
+void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size){
+ c->bytestream_start=
c->bytestream= buf;
+ c->bytestream_end= buf + buf_size;
- c->low= *c->bytestream++;
- c->low= (c->low<<9) + ((*c->bytestream++)<<1);
- c->range= 0x1FE00;
- c->bits_left= 7;
+#if CABAC_BITS == 16
+ c->low = (*c->bytestream++)<<18;
+ c->low+= (*c->bytestream++)<<10;
+#else
+ c->low = (*c->bytestream++)<<10;
+#endif
+ c->low+= ((*c->bytestream++)<<2) + 2;
+ 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(void)
+{
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]=
- c->lps_range[2*i+1][j]= 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]=
+ h264_mps_state[2 * i + 0] = 2 * mps_state[i] + 0;
+ ff_h264_mlps_state[128+2*i+1]=
+ h264_mps_state[2 * i + 1] = 2 * mps_state[i] + 1;
- if(lps_state[i]){
- c->lps_state[2*i+0]= 2*lps_state[i];
- c->lps_state[2*i+1]= 2*lps_state[i]+1;
+ if( i ){
+ 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;
}
}
-}
-
-#if 0 //selftest
-#define SIZE 10240
-int main(){
- 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, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);
-
- 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], 0, 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) )
- printf("CABAC bypass failure at %d\n", i);
-STOP_TIMER("get_cabac_bypass")
- }
-
- for(i=0; i<SIZE; i++){
-START_TIMER
- if( (r[i]&1) != get_cabac(&c, state) )
- printf("CABAC failure at %d\n", i);
-STOP_TIMER("get_cabac")
- }
-
- for(i=0; i<SIZE; i++){
-START_TIMER
- if( r[i] != get_cabac_u(&c, state, (i&1) ? 6 : 7, 3, i&1) )
- printf("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))
- printf("CABAC unary (truncated) binarization failure at %d\n", i);
-STOP_TIMER("get_cabac_ueg")
+ for(i=0; i< 63; i++){
+ ff_h264_last_coeff_flag_offset_8x8[i] = last_coeff_flag_offset_8x8[i];
}
-
- if(!get_cabac_terminate(&c))
- printf("where's the Terminator?\n");
-
- return 0;
}
-
-#endif
projects / ffmpeg / blobdiff