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ffmpeg/libavcodec/cabac.c

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CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
/*
* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
Replace FFmpeg with Libav in licence headers Signed-off-by: Mans Rullgard <mans@mansr.com>
2011-03-18 18:35:10 +01:00
* This file is part of Libav.
Change license headers to say 'FFmpeg' instead of 'this program/this library' and fix GPL/LGPL version mismatches. Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk
2006-10-07 17:30:46 +02:00
*
Replace FFmpeg with Libav in licence headers Signed-off-by: Mans Rullgard <mans@mansr.com>
2011-03-18 18:35:10 +01:00
* Libav is free software; you can redistribute it and/or
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
Change license headers to say 'FFmpeg' instead of 'this program/this library' and fix GPL/LGPL version mismatches. Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk
2006-10-07 17:30:46 +02:00
* version 2.1 of the License, or (at your option) any later version.
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
*
Replace FFmpeg with Libav in licence headers Signed-off-by: Mans Rullgard <mans@mansr.com>
2011-03-18 18:35:10 +01:00
* Libav is distributed in the hope that it will be useful,
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
* 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
Replace FFmpeg with Libav in licence headers Signed-off-by: Mans Rullgard <mans@mansr.com>
2011-03-18 18:35:10 +01:00
* License along with Libav; if not, write to the Free Software
Update licensing information: The FSF changed postal address. Originally committed as revision 4842 to svn://svn.ffmpeg.org/ffmpeg/trunk
2006-01-12 23:43:26 +01:00
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
*/
/**
Remove explicit filename from Doxygen @file commands. Passing an explicit filename to this command is only necessary if the documentation in the @file block refers to a file different from the one the block resides in. Originally committed as revision 22921 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-04-20 16:45:34 +02:00
* @file
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
* Context Adaptive Binary Arithmetic Coder.
*/
#include <string.h>
Use full path for #includes from another directory. Originally committed as revision 13098 to svn://svn.ffmpeg.org/ffmpeg/trunk
2008-05-09 13:56:36 +02:00
#include "libavutil/common.h"
Rename bitstream.h to get_bits.h. Originally committed as revision 18494 to svn://svn.ffmpeg.org/ffmpeg/trunk
2009-04-13 18:20:26 +02:00
#include "get_bits.h"
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
#include "cabac.h"
cabac: split cabac.h into declarations and function definitions This fixes standalone compilation of some decoders with --disable-optimizations. cabac.h defines some inline functions that use symbols from cabac.c. Without optimizations these inline functions are not eliminated and linking fails with references to non-existing symbols. Splitting the inline functions off into their own header and only #including it in the places where the inline functions are used allows #including cabac.h from anywhere without ill effects.
2012-01-12 21:56:02 +01:00
#include "cabac_functions.h"
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
cabac: Make CABAC states hardcoded There is not much reason to generate such a small table at runtime. Signed-off-by: Derek Buitenhuis <derekb@vimeo.com> Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
2015-10-07 18:33:00 +02:00
const 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,
// LPS range
-128, -128, -128, -128, -128, -128, 123, 123,
116, 116, 111, 111, 105, 105, 100, 100,
95, 95, 90, 90, 85, 85, 81, 81,
77, 77, 73, 73, 69, 69, 66, 66,
62, 62, 59, 59, 56, 56, 53, 53,
51, 51, 48, 48, 46, 46, 43, 43,
41, 41, 39, 39, 37, 37, 35, 35,
33, 33, 32, 32, 30, 30, 29, 29,
27, 27, 26, 26, 24, 24, 23, 23,
22, 22, 21, 21, 20, 20, 19, 19,
18, 18, 17, 17, 16, 16, 15, 15,
14, 14, 14, 14, 13, 13, 12, 12,
12, 12, 11, 11, 11, 11, 10, 10,
10, 10, 9, 9, 9, 9, 8, 8,
8, 8, 7, 7, 7, 7, 7, 7,
6, 6, 6, 6, 6, 6, 2, 2,
-80, -80, -89, -89, -98, -98, -106, -106,
-114, -114, -121, -121, -128, -128, 122, 122,
116, 116, 110, 110, 104, 104, 99, 99,
94, 94, 89, 89, 85, 85, 80, 80,
76, 76, 72, 72, 69, 69, 65, 65,
62, 62, 59, 59, 56, 56, 53, 53,
50, 50, 48, 48, 45, 45, 43, 43,
41, 41, 39, 39, 37, 37, 35, 35,
33, 33, 31, 31, 30, 30, 28, 28,
27, 27, 26, 26, 24, 24, 23, 23,
22, 22, 21, 21, 20, 20, 19, 19,
18, 18, 17, 17, 16, 16, 15, 15,
14, 14, 14, 14, 13, 13, 12, 12,
12, 12, 11, 11, 11, 11, 10, 10,
9, 9, 9, 9, 9, 9, 8, 8,
8, 8, 7, 7, 7, 7, 2, 2,
-48, -48, -59, -59, -69, -69, -78, -78,
-87, -87, -96, -96, -104, -104, -112, -112,
-119, -119, -126, -126, 123, 123, 117, 117,
111, 111, 105, 105, 100, 100, 95, 95,
90, 90, 86, 86, 81, 81, 77, 77,
73, 73, 69, 69, 66, 66, 63, 63,
59, 59, 56, 56, 54, 54, 51, 51,
48, 48, 46, 46, 43, 43, 41, 41,
39, 39, 37, 37, 35, 35, 33, 33,
32, 32, 30, 30, 29, 29, 27, 27,
26, 26, 25, 25, 23, 23, 22, 22,
21, 21, 20, 20, 19, 19, 18, 18,
17, 17, 16, 16, 15, 15, 15, 15,
14, 14, 13, 13, 12, 12, 12, 12,
11, 11, 11, 11, 10, 10, 10, 10,
9, 9, 9, 9, 8, 8, 2, 2,
-16, -16, -29, -29, -40, -40, -51, -51,
-61, -61, -71, -71, -81, -81, -90, -90,
-98, -98, -106, -106, -114, -114, -121, -121,
-128, -128, 122, 122, 116, 116, 110, 110,
104, 104, 99, 99, 94, 94, 89, 89,
85, 85, 80, 80, 76, 76, 72, 72,
69, 69, 65, 65, 62, 62, 59, 59,
56, 56, 53, 53, 50, 50, 48, 48,
45, 45, 43, 43, 41, 41, 39, 39,
37, 37, 35, 35, 33, 33, 31, 31,
30, 30, 28, 28, 27, 27, 25, 25,
24, 24, 23, 23, 22, 22, 21, 21,
20, 20, 19, 19, 18, 18, 17, 17,
16, 16, 15, 15, 14, 14, 14, 14,
13, 13, 12, 12, 12, 12, 11, 11,
11, 11, 10, 10, 9, 9, 2, 2,
// mlps state
127, 126, 77, 76, 77, 76, 75, 74,
75, 74, 75, 74, 73, 72, 73, 72,
73, 72, 71, 70, 71, 70, 71, 70,
69, 68, 69, 68, 67, 66, 67, 66,
67, 66, 65, 64, 65, 64, 63, 62,
61, 60, 61, 60, 61, 60, 59, 58,
59, 58, 57, 56, 55, 54, 55, 54,
53, 52, 53, 52, 51, 50, 49, 48,
49, 48, 47, 46, 45, 44, 45, 44,
43, 42, 43, 42, 39, 38, 39, 38,
37, 36, 37, 36, 33, 32, 33, 32,
31, 30, 31, 30, 27, 26, 27, 26,
25, 24, 23, 22, 23, 22, 19, 18,
19, 18, 17, 16, 15, 14, 13, 12,
11, 10, 9, 8, 9, 8, 5, 4,
5, 4, 3, 2, 1, 0, 0, 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, 63, 64, 65,
66, 67, 68, 69, 70, 71, 72, 73,
74, 75, 76, 77, 78, 79, 80, 81,
82, 83, 84, 85, 86, 87, 88, 89,
90, 91, 92, 93, 94, 95, 96, 97,
98, 99, 100, 101, 102, 103, 104, 105,
106, 107, 108, 109, 110, 111, 112, 113,
114, 115, 116, 117, 118, 119, 120, 121,
122, 123, 124, 125, 124, 125, 126, 127,
// last_coeff_flag_offset_8x8
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
shift CABACContext.range right, this reduces the number of shifts needed in get_cabac() and is slightly faster on P3 (and should be much faster on P4 as the P4 except the more recent variants lacks an integer shifter and so shifts have ~10 times longer latency then simple operations like adds) Originally committed as revision 6702 to svn://svn.ffmpeg.org/ffmpeg/trunk
2006-10-15 22:40:50 +02:00
};
optimization Originally committed as revision 3639 to svn://svn.ffmpeg.org/ffmpeg/trunk
2004-10-26 05:12:21 +02:00
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
/**
*
* @param buf_size size of buf in bits
*/
some of the warning fixes by (Michael Roitzsch <mroi at users dot sourceforge dot net>) Originally committed as revision 3140 to svn://svn.ffmpeg.org/ffmpeg/trunk
2004-05-18 19:09:46 +02:00
void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size){
COSMETICS: Remove all trailing whitespace. Originally committed as revision 4749 to svn://svn.ffmpeg.org/ffmpeg/trunk
2005-12-17 19:14:38 +01:00
c->bytestream_start=
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
c->bytestream= buf;
overread fix Originally committed as revision 3294 to svn://svn.ffmpeg.org/ffmpeg/trunk
2004-07-08 02:53:21 +02:00
c->bytestream_end= buf + buf_size;
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
optimization Originally committed as revision 3639 to svn://svn.ffmpeg.org/ffmpeg/trunk
2004-10-26 05:12:21 +02:00
#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;
shift CABACContext.range right, this reduces the number of shifts needed in get_cabac() and is slightly faster on P3 (and should be much faster on P4 as the P4 except the more recent variants lacks an integer shifter and so shifts have ~10 times longer latency then simple operations like adds) Originally committed as revision 6702 to svn://svn.ffmpeg.org/ffmpeg/trunk
2006-10-15 22:40:50 +02:00
c->range= 0x1FE;
CABAC note, this is just the CABAC (de)coder not complete h264-cabac support Originally committed as revision 1915 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-05-28 20:44:52 +02:00
}
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