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FFmpeg/libavcodec/cavsdec.c
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Rainbaby c37ebc8d98 avcodec/cavsdec: accept the AVS1-P16 Broadcasting profile 
Until now decode_seq_header() refused profile_id 0x48, so nothing the
preceding commits added was reachable. The annex A de-emulation and the
field decoding among them deliberately apply to JiZhun as well.

A Broadcasting sequence that is not 8 bit 4:2:0 is refused rather than
decoded with the wrong macroblock layer.

The SD AVS+ mux attached to trac ticket 6948 decodes with this: both
video streams, frame coded AEC pictures throughout.

Fixes: https://trac.ffmpeg.org/ticket/6948
Signed-off-by: Rainbaby <r@bgr.jp>
2026-11-02 22:18:06 +00:00

2400 lines
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/*
* Chinese AVS video (AVS1-P2/P16, JiZhun and Broadcasting profiles) decoder.
* Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
*
* 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 2.1 of the License, or (at your option) any later version.
*
* 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Chinese AVS video (AVS1-P2/P16, JiZhun and Broadcasting profiles) decoder
* @author Stefan Gehrer <stefan.gehrer@gmx.de>
*
* Clause, table and figure numbers refer to GY/T 257.1-2012.
*/
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/intmath.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "get_bits.h"
#include "golomb.h"
#include "cavs.h"
#include "codec_internal.h"
#include "profiles.h"
#include "decode.h"
#include "mathops.h"
#include "mpeg12data.h"
#include "put_bits.h"
#include "startcode.h"
static const uint8_t mv_scan[4] = {
MV_FWD_X0, MV_FWD_X1,
MV_FWD_X2, MV_FWD_X3
};
static const uint8_t cbp_tab[64][2] = {
{ 63, 0 }, { 15, 15 }, { 31, 63 }, { 47, 31 }, { 0, 16 }, { 14, 32 }, { 13, 47 }, { 11, 13 },
{ 7, 14 }, { 5, 11 }, { 10, 12 }, { 8, 5 }, { 12, 10 }, { 61, 7 }, { 4, 48 }, { 55, 3 },
{ 1, 2 }, { 2, 8 }, { 59, 4 }, { 3, 1 }, { 62, 61 }, { 9, 55 }, { 6, 59 }, { 29, 62 },
{ 45, 29 }, { 51, 27 }, { 23, 23 }, { 39, 19 }, { 27, 30 }, { 46, 28 }, { 53, 9 }, { 30, 6 },
{ 43, 60 }, { 37, 21 }, { 60, 44 }, { 16, 26 }, { 21, 51 }, { 28, 35 }, { 19, 18 }, { 35, 20 },
{ 42, 24 }, { 26, 53 }, { 44, 17 }, { 32, 37 }, { 58, 39 }, { 24, 45 }, { 20, 58 }, { 17, 43 },
{ 18, 42 }, { 48, 46 }, { 22, 36 }, { 33, 33 }, { 25, 34 }, { 49, 40 }, { 40, 52 }, { 36, 49 },
{ 34, 50 }, { 50, 56 }, { 52, 25 }, { 54, 22 }, { 41, 54 }, { 56, 57 }, { 38, 41 }, { 57, 38 }
};
static const uint8_t scan3x3[4] = { 4, 5, 7, 8 };
static const uint8_t dequant_shift[64] = {
14, 14, 14, 14, 14, 14, 14, 14,
13, 13, 13, 13, 13, 13, 13, 13,
13, 12, 12, 12, 12, 12, 12, 12,
11, 11, 11, 11, 11, 11, 11, 11,
11, 10, 10, 10, 10, 10, 10, 10,
10, 9, 9, 9, 9, 9, 9, 9,
9, 8, 8, 8, 8, 8, 8, 8,
7, 7, 7, 7, 7, 7, 7, 7
};
static const uint16_t dequant_mul[64] = {
32768, 36061, 38968, 42495, 46341, 50535, 55437, 60424,
32932, 35734, 38968, 42495, 46177, 50535, 55109, 59933,
65535, 35734, 38968, 42577, 46341, 50617, 55027, 60097,
32809, 35734, 38968, 42454, 46382, 50576, 55109, 60056,
65535, 35734, 38968, 42495, 46320, 50515, 55109, 60076,
65535, 35744, 38968, 42495, 46341, 50535, 55099, 60087,
65535, 35734, 38973, 42500, 46341, 50535, 55109, 60097,
32771, 35734, 38965, 42497, 46341, 50535, 55109, 60099
};
#define EOB 0, 0, 0
static const struct dec_2dvlc intra_dec[7] = {
{
{ //level / run / table_inc
{ 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
{ 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
{ 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
{ 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 2, 1, 2 }, { -2, 1, 2 },
{ 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
{ 1, 15, 1 }, { -1, 15, 1 }, { 2, 2, 2 }, { -2, 2, 2 }, { 1, 16, 1 }, { -1, 16, 1 },
{ 1, 17, 1 }, { -1, 17, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 18, 1 }, { -1, 18, 1 },
{ 1, 19, 1 }, { -1, 19, 1 }, { 2, 3, 2 }, { -2, 3, 2 }, { 1, 20, 1 }, { -1, 20, 1 },
{ 1, 21, 1 }, { -1, 21, 1 }, { 2, 4, 2 }, { -2, 4, 2 }, { 1, 22, 1 }, { -1, 22, 1 },
{ 2, 5, 2 }, { -2, 5, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { EOB }
},
//level_add
{ 0, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1 },
2, //golomb_order
0, //inc_limit
23, //max_run
},
{
{ //level / run
{ 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 }, { -2, 1, 1 },
{ 1, 3, 0 }, { -1, 3, 0 }, { EOB }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
{ -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 2, 2, 1 },
{ -2, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 1, 9, 0 },
{ -1, 9, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 4, 1, 2 }, { -4, 1, 2 }, { 1, 10, 0 },
{ -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 3, 2, 2 },
{ -3, 2, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 5, 1, 3 },
{ -5, 1, 3 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 14, 0 },
{ -1, 14, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 2, 8, 1 }, { -2, 8, 1 }, { 3, 3, 2 },
{ -3, 3, 2 }, { 6, 1, 3 }, { -6, 1, 3 }, { 1, 15, 0 }, { -1, 15, 0 }
},
//level_add
{ 0, 7, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
1, //inc_limit
15, //max_run
},
{
{ //level / run
{ 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 },
{ 3, 1, 1 }, { -3, 1, 1 }, { EOB }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
{ -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
{ -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
{ -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 2, 4, 0 },
{ -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
{ -7, 1, 2 }, { 3, 3, 1 }, { -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 },
{ -1, 8, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 3 }, { -8, 1, 3 }, { 1, 9, 0 },
{ -1, 9, 0 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 }, { 2, 7, 0 },
{ -2, 7, 0 }, { 9, 1, 3 }, { -9, 1, 3 }, { 1, 10, 0 }, { -1, 10, 0 }
},
//level_add
{ 0, 10, 6, 4, 4, 3, 3, 3, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
2, //inc_limit
10, //max_run
},
{
{ //level / run
{ 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
{ 1, 2, 0 }, { -1, 2, 0 }, { EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 1 },
{ -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 1 },
{ -6, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
{ -1, 4, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
{ -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 5, 2, 1 },
{ -5, 2, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 10, 1, 2 }, {-10, 1, 2 }, { 3, 3, 0 },
{ -3, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 11, 1, 3 }, {-11, 1, 3 }, { 6, 2, 1 },
{ -6, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 5, 0 }, { -2, 5, 0 }, { 3, 4, 0 },
{ -3, 4, 0 }, { 12, 1, 3 }, {-12, 1, 3 }, { 4, 3, 0 }, { -4, 3, 0 }
},
//level_add
{ 0, 13, 7, 5, 4, 3, 2, 2, -1, -1, -1 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
4, //inc_limit
7, //max_run
},
{
{ //level / run
{ 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
{ EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
{ -6, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 1 },
{ -8, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 10, 1, 1 },
{-10, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 2 },
{-11, 1, 2 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 13, 1, 2 },
{-13, 1, 2 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 },
{ -2, 3, 0 }, { 14, 1, 2 }, {-14, 1, 2 }, { 6, 2, 0 }, { -6, 2, 0 }, { 15, 1, 2 },
{-15, 1, 2 }, { 16, 1, 2 }, {-16, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 5, 0 },
{ -1, 5, 0 }, { 7, 2, 0 }, { -7, 2, 0 }, { 17, 1, 2 }, {-17, 1, 2 }
},
//level_add
{ 0,18, 8, 4, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
7, //inc_limit
5, //max_run
},
{
{ //level / run
{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
{ -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
{ -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 11, 1, 1 },
{-11, 1, 1 }, { 12, 1, 1 }, {-12, 1, 1 }, { 13, 1, 1 }, {-13, 1, 1 }, { 2, 2, 0 },
{ -2, 2, 0 }, { 14, 1, 1 }, {-14, 1, 1 }, { 15, 1, 1 }, {-15, 1, 1 }, { 3, 2, 0 },
{ -3, 2, 0 }, { 16, 1, 1 }, {-16, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 17, 1, 1 },
{-17, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 18, 1, 1 }, {-18, 1, 1 }, { 5, 2, 0 },
{ -5, 2, 0 }, { 19, 1, 1 }, {-19, 1, 1 }, { 20, 1, 1 }, {-20, 1, 1 }, { 6, 2, 0 },
{ -6, 2, 0 }, { 21, 1, 1 }, {-21, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }
},
//level_add
{ 0, 22, 7, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
10, //inc_limit
3, //max_run
},
{
{ //level / run
{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
{ -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
{ -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 11, 1, 0 }, {-11, 1, 0 }, { 12, 1, 0 },
{-12, 1, 0 }, { 13, 1, 0 }, {-13, 1, 0 }, { 14, 1, 0 }, {-14, 1, 0 }, { 15, 1, 0 },
{-15, 1, 0 }, { 16, 1, 0 }, {-16, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 17, 1, 0 },
{-17, 1, 0 }, { 18, 1, 0 }, {-18, 1, 0 }, { 19, 1, 0 }, {-19, 1, 0 }, { 20, 1, 0 },
{-20, 1, 0 }, { 21, 1, 0 }, {-21, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 22, 1, 0 },
{-22, 1, 0 }, { 23, 1, 0 }, {-23, 1, 0 }, { 24, 1, 0 }, {-24, 1, 0 }, { 25, 1, 0 },
{-25, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 26, 1, 0 }, {-26, 1, 0 }
},
//level_add
{ 0, 27, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
INT_MAX, //inc_limit
2, //max_run
}
};
static const struct dec_2dvlc inter_dec[7] = {
{
{ //level / run
{ 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
{ 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
{ 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
{ 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 1, 12, 1 }, { -1, 12, 1 },
{ 1, 13, 1 }, { -1, 13, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 14, 1 }, { -1, 14, 1 },
{ 1, 15, 1 }, { -1, 15, 1 }, { 1, 16, 1 }, { -1, 16, 1 }, { 1, 17, 1 }, { -1, 17, 1 },
{ 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 }, { 3, 1, 3 }, { -3, 1, 3 },
{ 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 2, 2, 2 }, { -2, 2, 2 },
{ 1, 22, 1 }, { -1, 22, 1 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
{ 1, 25, 1 }, { -1, 25, 1 }, { 1, 26, 1 }, { -1, 26, 1 }, { EOB }
},
//level_add
{ 0, 4, 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 },
3, //golomb_order
0, //inc_limit
26 //max_run
},
{
{ //level / run
{ 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 1, 3, 0 },
{ -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
{ -1, 6, 0 }, { 2, 1, 1 }, { -2, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 },
{ -1, 8, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 2, 2, 1 },
{ -2, 2, 1 }, { 1, 11, 0 }, { -1, 11, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 1, 2 },
{ -3, 1, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 }, { -1, 14, 0 }, { 2, 3, 1 },
{ -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 1, 16, 0 },
{ -1, 16, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 1, 17, 0 }, { -1, 17, 0 }, { 4, 1, 3 },
{ -4, 1, 3 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 18, 0 }, { -1, 18, 0 }, { 1, 19, 0 },
{ -1, 19, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 3, 2, 2 }, { -3, 2, 2 }
},
//level_add
{ 0, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
1, //inc_limit
19 //max_run
},
{
{ //level / run
{ 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 0 },
{ -2, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 3, 1, 1 },
{ -3, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
{ -1, 6, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 1, 2 },
{ -4, 1, 2 }, { 1, 8, 0 }, { -1, 8, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 4, 0 },
{ -2, 4, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 5, 1, 2 },
{ -5, 1, 2 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 6, 0 },
{ -2, 6, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 3, 1 }, { -3, 3, 1 }, { 6, 1, 2 },
{ -6, 1, 2 }, { 4, 2, 2 }, { -4, 2, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 7, 0 },
{ -2, 7, 0 }, { 3, 4, 1 }, { -3, 4, 1 }, { 1, 14, 0 }, { -1, 14, 0 }
},
//level_add
{ 0, 7, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
2, //inc_limit
14 //max_run
},
{
{ //level / run
{ 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
{ -1, 2, 0 }, { 3, 1, 0 }, { -3, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
{ -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 1 },
{ -5, 1, 1 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 2, 3, 0 },
{ -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 2, 4, 0 },
{ -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
{ -7, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 5, 0 },
{ -2, 5, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 4, 0 },
{ -3, 4, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 1, 10, 0 },
{ -1, 10, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 4, 3, 1 }, { -4, 3, 1 }
},
//level_add
{ 0,10, 6, 5, 4, 3, 3, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
3, //inc_limit
10 //max_run
},
{
{ //level / run
{ 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
{ -3, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 },
{ -5, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 0 },
{ -6, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
{ -1, 4, 0 }, { 8, 1, 1 }, { -8, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
{ -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 5, 2, 0 },
{ -5, 2, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 10, 1, 2 },
{-10, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 11, 1, 2 }, {-11, 1, 2 }, { 1, 7, 0 },
{ -1, 7, 0 }, { 6, 2, 0 }, { -6, 2, 0 }, { 3, 4, 0 }, { -3, 4, 0 }, { 2, 5, 0 },
{ -2, 5, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 4, 3, 0 }, { -4, 3, 0 }
},
//level_add
{ 0, 13, 7, 5, 4, 3, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
6, //inc_limit
7 //max_run
},
{
{ //level / run
{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 1, 2, 0 },
{ -1, 2, 0 }, { 6, 1, 0 }, { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 },
{ -8, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 1, 3, 0 },
{ -1, 3, 0 }, { 10, 1, 1 }, { -10, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 1 },
{ -11, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 1 }, { -12, 1, 1 }, { 1, 4, 0 },
{ -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 13, 1, 1 }, { -13, 1, 1 }, { 5, 2, 0 },
{ -5, 2, 0 }, { 14, 1, 1 }, { -14, 1, 1 }, { 6, 2, 0 }, { -6, 2, 0 }, { 1, 5, 0 },
{ -1, 5, 0 }, { 15, 1, 1 }, { -15, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 16, 1, 1 },
{ -16, 1, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 2, 0 }, { -7, 2, 0 }
},
//level_add
{ 0, 17, 8, 4, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
9, //inc_limit
5 //max_run
},
{
{ //level / run
{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
{ -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 8, 1, 0 },
{ -8, 1, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
{ -11, 1, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 13, 1, 0 },
{ -13, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 15, 1, 0 },
{ -15, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 16, 1, 0 }, { -16, 1, 0 }, { 17, 1, 0 },
{ -17, 1, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 19, 1, 0 },
{ -19, 1, 0 }, { 20, 1, 0 }, { -20, 1, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 1, 4, 0 },
{ -1, 4, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 21, 1, 0 }, { -21, 1, 0 }
},
//level_add
{ 0, 22, 6, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
2, //golomb_order
INT_MAX, //inc_limit
4 //max_run
}
};
static const struct dec_2dvlc chroma_dec[5] = {
{
{ //level / run
{ 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
{ 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
{ 1, 7, 1 }, { -1, 7, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 8, 1 }, { -1, 8, 1 },
{ 1, 9, 1 }, { -1, 9, 1 }, { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 },
{ 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
{ 1, 15, 1 }, { -1, 15, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 16, 1 }, { -1, 16, 1 },
{ 1, 17, 1 }, { -1, 17, 1 }, { 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 },
{ 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 1, 22, 1 }, { -1, 22, 1 },
{ 2, 2, 2 }, { -2, 2, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
{ 1, 25, 1 }, { -1, 25, 1 }, { 4, 1, 3 }, { -4, 1, 3 }, { EOB }
},
//level_add
{ 0, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1 },
2, //golomb_order
0, //inc_limit
25 //max_run
},
{
{ //level / run
{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 },
{ -2, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
{ -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 1, 7, 0 },
{ -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 2, 1 }, { -2, 2, 1 }, { 1, 9, 0 },
{ -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 4, 1, 2 },
{ -4, 1, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 },
{ -1, 14, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 },
{ -2, 4, 1 }, { 5, 1, 3 }, { -5, 1, 3 }, { 3, 2, 2 }, { -3, 2, 2 }, { 1, 16, 0 },
{ -1, 16, 0 }, { 1, 17, 0 }, { -1, 17, 0 }, { 1, 18, 0 }, { -1, 18, 0 }, { 2, 5, 1 },
{ -2, 5, 1 }, { 1, 19, 0 }, { -1, 19, 0 }, { 1, 20, 0 }, { -1, 20, 0 }
},
//level_add
{ 0, 6, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1 },
0, //golomb_order
1, //inc_limit
20 //max_run
},
{
{ //level / run
{ 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
{ -1, 2, 0 }, { 3, 1, 1 }, { -3, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 4, 1, 1 },
{ -4, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
{ -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
{ -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 1, 7, 0 },
{ -1, 7, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 1, 2 }, { -7, 1, 2 }, { 1, 8, 0 },
{ -1, 8, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 3, 1 },
{ -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 2 },
{ -8, 1, 2 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 9, 1, 2 },
{ -9, 1, 2 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 },
},
//level_add
{ 0,10, 6, 4, 4, 3, 3, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
1, //golomb_order
2, //inc_limit
11 //max_run
},
{
{ //level / run
{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 5, 1, 1 },
{ -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 1, 3, 0 },
{ -1, 3, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 8, 1, 1 },
{ -8, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 9, 1, 1 },
{ -9, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 10, 1, 1 },
{-10, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 2, 4, 0 },
{ -2, 4, 0 }, { 11, 1, 1 }, {-11, 1, 1 }, { 1, 6, 0 }, { -1, 6, 0 }, { 12, 1, 1 },
{-12, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 6, 2, 1 }, { -6, 2, 1 }, { 13, 1, 1 },
{-13, 1, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 }, { -1, 8, 0 },
},
//level_add
{ 0, 14, 7, 4, 3, 3, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
1, //golomb_order
4, //inc_limit
8 //max_run
},
{
{ //level / run
{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
{ -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 1, 2, 0 },
{ -1, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
{ -11, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 13, 1, 0 },
{ -13, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 1, 3, 0 },
{ -1, 3, 0 }, { 15, 1, 0 }, { -15, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 16, 1, 0 },
{ -16, 1, 0 }, { 17, 1, 0 }, { -17, 1, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 },
{ -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 6, 2, 0 },
{ -6, 2, 0 }, { 19, 1, 0 }, { -19, 1, 0 }, { 1, 5, 0 }, { -1, 5, 0 },
},
//level_add
{ 0, 20, 7, 3, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
0, //golomb_order
INT_MAX, //inc_limit
5, //max_run
}
};
#undef EOB
/*****************************************************************************
*
* motion vector prediction
*
****************************************************************************/
static inline void store_mvs(AVSContext *h)
{
h->col_mv[h->mbidx * 4 + 0] = h->mv[MV_FWD_X0];
h->col_mv[h->mbidx * 4 + 1] = h->mv[MV_FWD_X1];
h->col_mv[h->mbidx * 4 + 2] = h->mv[MV_FWD_X2];
h->col_mv[h->mbidx * 4 + 3] = h->mv[MV_FWD_X3];
}
/**
* Scale one component of the co-located motion vector, den being
* 16384 / BlockDistanceRef (clause 9.9.1 b) 3)). The intermediate
* products stay unsigned, they can overflow an int.
*/
static inline int scale_direct(unsigned den, int mv, int dist)
{
int m = FF_SIGNBIT(mv);
return (((den + (den * mv * dist ^ m) - m - 1) >> 14) ^ m) - m;
}
/**
* The parity of a field is the parity of its distance index: a first
* coded field has an even one, a second field an odd one (clause 9.4.6.1).
*/
static inline int field_parity(AVSContext *h, int distance_index)
{
return (distance_index & 1) ^ !h->top_field_first;
}
/**
* Direct mode: scale the co-located motion vector by its own
* BlockDistance, carried in the mv cache (clause 9.9.1 b)). Annex B
* fixes PictureStructure over a sequence, so the frame and field
* conversion of step 2 cannot arise.
*/
static inline void mv_pred_direct(AVSContext *h, cavs_vector *pmv_fw,
cavs_vector *col_mv)
{
cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;
unsigned den = h->direct_den[col_mv->dist];
int delta_fw = 0, delta_bw = 0;
int mv_ref_y = col_mv->y;
pmv_fw->ref = h->ref_base[0];
pmv_bw->ref = h->ref_base[1];
if (!h->pic_structure) {
/* reference field selection of 9.9.1 b) 1): an enhanced second
* field references index 0 in both directions, its co-located
* block being in the first field of the backward reference */
int enh = h->b_field_enhanced;
int di_col = h->DPB[0].poc + (enh ? 0 : h->field);
int di_ref = (di_col - col_mv->dist) & 511;
int di_fw0 = (h->DPB[1].poc + 1) & 511;
if (!enh || !h->field)
pmv_fw->ref += di_ref != di_fw0;
if (!enh)
pmv_bw->ref += h->field;
if (enh) {
/* the field parity offsets of 9.9.1 b) 3) */
int par_cur = h->field ^ !h->top_field_first;
int par_bw = h->ref[pmv_bw->ref].parity;
mv_ref_y += 2 * (field_parity(h, di_ref) - par_bw);
delta_fw = 2 * (h->ref[pmv_fw->ref].parity - par_cur);
delta_bw = 2 * (par_bw - par_cur);
}
}
pmv_fw->dist = h->dist[pmv_fw->ref];
pmv_bw->dist = h->dist[pmv_bw->ref];
pmv_fw->ref_idx = pmv_bw->ref_idx = 0; /* derived (clause 9.4.5) */
/* scale the co-located motion vector according to its temporal span */
pmv_fw->x = scale_direct(den, col_mv->x, pmv_fw->dist);
pmv_bw->x = -scale_direct(den, col_mv->x, pmv_bw->dist);
pmv_fw->y = scale_direct(den, mv_ref_y, pmv_fw->dist) - delta_fw;
pmv_bw->y = -scale_direct(den, mv_ref_y, pmv_bw->dist) - delta_bw;
}
/**
* Symmetric mode: derive the backward mv from the forward one, scaled by
* the block's own pair of distances (clause 9.9.1 c)).
*/
static inline void mv_pred_sym(AVSContext *h, cavs_vector *src,
enum cavs_block size)
{
cavs_vector *dst = src + MV_BWD_OFFS;
int factor;
if (h->pic_structure)
dst->ref = h->ref_base[1];
else
dst->ref = h->ref_base[1] + 1 - (src->ref - h->ref_base[0]);
dst->dist = h->dist[dst->ref];
dst->ref_idx = 0; /* derived, not read (clause 9.4.5) */
factor = dst->dist * h->scale_den[src->ref];
/* backward mv is the scaled and negated forward mv */
dst->x = -((src->x * factor + 256) >> 9);
dst->y = -((src->y * factor + 256) >> 9);
set_mvs(dst, size);
}
/*****************************************************************************
*
* residual data decoding
*
****************************************************************************/
/** kth-order exponential golomb code */
static inline int get_ue_code(GetBitContext *gb, int order)
{
unsigned ret = get_ue_golomb(gb);
if (ret >= ((1U<<31)>>order)) {
av_log(NULL, AV_LOG_ERROR, "get_ue_code: value too large\n");
return AVERROR_INVALIDDATA;
}
if (order) {
return (ret<<order) + get_bits(gb, order);
}
return ret;
}
static inline int dequant(AVSContext *h, int16_t *level_buf, uint8_t *run_buf,
int16_t *dst, int mul, int shift, int coeff_num)
{
int round = 1 << (shift - 1);
int pos = -1;
const uint8_t *scantab = h->scantable;
/* inverse scan and dequantization */
while (--coeff_num >= 0) {
pos += run_buf[coeff_num];
if (pos > 63) {
av_log(h->avctx, AV_LOG_ERROR,
"position out of block bounds at pic %d MB(%d,%d)\n",
h->cur.poc, h->mbx, h->mby);
return AVERROR_INVALIDDATA;
}
dst[scantab[pos]] = (level_buf[coeff_num] * mul + round) >> shift;
}
return 0;
}
/**
* decode coefficients from one 8x8 block, dequantize, inverse transform
* and add them to sample block
* @param r pointer to 2D VLC table
* @param esc_golomb_order escape codes are k-golomb with this order k
* @param qp quantizer
* @param dst location of sample block
* @param stride line stride in frame buffer
*/
static int decode_residual_block(AVSContext *h, GetBitContext *gb,
const struct dec_2dvlc *r, int esc_golomb_order,
int qp, uint8_t *dst, ptrdiff_t stride)
{
int i, esc_code, level, mask, ret;
unsigned int level_code, run;
int16_t level_buf[65];
uint8_t run_buf[65];
int16_t *block = h->block;
for (i = 0; i < 65; i++) {
level_code = get_ue_code(gb, r->golomb_order);
if (level_code >= ESCAPE_CODE) {
run = ((level_code - ESCAPE_CODE) >> 1) + 1;
if(run > 64) {
av_log(h->avctx, AV_LOG_ERROR, "run %d is too large\n", run);
return AVERROR_INVALIDDATA;
}
esc_code = get_ue_code(gb, esc_golomb_order);
if (esc_code < 0 || esc_code > 32767) {
av_log(h->avctx, AV_LOG_ERROR, "esc_code invalid\n");
return AVERROR_INVALIDDATA;
}
level = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
while (level > r->inc_limit)
r++;
mask = -(level_code & 1);
level = (level ^ mask) - mask;
} else {
level = r->rltab[level_code][0];
if (!level) //end of block signal
break;
run = r->rltab[level_code][1];
r += r->rltab[level_code][2];
}
level_buf[i] = level;
run_buf[i] = run;
}
ret = dequant(h, level_buf, run_buf, block, dequant_mul[qp],
dequant_shift[qp], i);
if (ret >= 0)
h->cdsp.cavs_idct8_add(dst, block, stride);
/* dequant() can write before it fails, so always clear the block */
h->bdsp.clear_block(block);
return ret;
}
/*****************************************************************************
*
* advanced entropy coding (AEC), clause 8.4
*
****************************************************************************/
/* Table 51: start index of each ae(v) element's context models */
#define AEC_MB_SKIP_RUN 0
#define AEC_MB_TYPE 4
#define AEC_MB_PART_TYPE 19
#define AEC_INTRA_LUMA_PRED_MODE 22
#define AEC_INTRA_CHROMA_PRED_MODE 26
#define AEC_MB_REFERENCE_INDEX 30
#define AEC_MV_DIFF_X 36
#define AEC_MV_DIFF_Y 42
#define AEC_CBP 48
#define AEC_MB_QP_DELTA 54
#define AEC_COEFF_FRAME_LUMA 58
#define AEC_COEFF_FRAME_CHROMA 124
#define AEC_COEFF_FIELD_LUMA 190
#define AEC_COEFF_FIELD_CHROMA 256
/* a conforming block's quantized coefficients span -2^(n+3)..2^(n+3)-1
* with n the sample precision, 8 for both profiles (clause 9.6.2) */
#define CAVS_MAX_ABS_LEVEL 2048
/* one trans_coefficient set: 14 + 32 + 20 models, coeffRun from index 46 */
#define AEC_COEFF_NUM_CTX 66
#define AEC_COEFF_RUN 46
#define AEC_COEFF_RUN_NUM_CTX 20
/** Table 52, priIdx as a function of lMax, which saturates at 5. */
static const uint8_t cavs_aec_pri_idx[6] = { 0, 1, 2, 3, 3, 4 };
/** Decode mb_skip_run, table 44 unary (8.4.4.2 a)). @return SkipMbCount */
static int aec_mb_skip_run(AVSContext *h)
{
int v = 0;
while (!ff_cavs_aec_decode_decision(&h->aec,
AEC_MB_SKIP_RUN + FFMIN(v, 3))) {
if (++v > h->mb_width * h->mb_height) {
av_log(h->avctx, AV_LOG_ERROR, "mb_skip_run out of range\n");
return AVERROR_INVALIDDATA;
}
}
return v;
}
/** Decode mb_type, table 44 unary mapped by tables 54 and 55 (9.4.2 a) 2)) */
static int aec_mb_type_p(AVSContext *h)
{
int v = 0;
while (!ff_cavs_aec_decode_decision(&h->aec, AEC_MB_TYPE + FFMIN(v, 4))) {
if (++v > 5 - h->skip_mode_flag) {
av_log(h->avctx, AV_LOG_ERROR, "mb_type out of range\n");
return AVERROR_INVALIDDATA;
}
}
return v ? v - 1 + h->skip_mode_flag : 5;
}
/** Decode mb_type in a B picture (table 45, 8.4.4.2 b)); see table 56. */
static int aec_mb_type_b(AVSContext *h)
{
int a = (h->flags & A_AVAIL) && h->left_mb_type != B_SKIP &&
h->left_mb_type != B_DIRECT;
int b = (h->flags & B_AVAIL) && h->top_mb_type[h->mbx] != B_SKIP &&
h->top_mb_type[h->mbx] != B_DIRECT;
int v;
if (!ff_cavs_aec_decode_decision(&h->aec, AEC_MB_TYPE + 5 + a + b))
return h->skip_mode_flag;
for (v = 1;
!ff_cavs_aec_decode_decision(&h->aec, AEC_MB_TYPE + 7 + FFMIN(v, 7));
v++) {
if (v >= 24 - h->skip_mode_flag) {
av_log(h->avctx, AV_LOG_ERROR, "mb_type out of range\n");
return AVERROR_INVALIDDATA;
}
}
return v + h->skip_mode_flag;
}
/**
* Decode mb_part_type (tables 46 and 57, 8.4.4.2 c)).
* @return MbPartType, 0 to 3
*/
static int aec_mb_part_type(AVSContext *h)
{
int b0 = ff_cavs_aec_decode_decision(&h->aec, AEC_MB_PART_TYPE);
int b1 = ff_cavs_aec_decode_decision(&h->aec,
AEC_MB_PART_TYPE + (b0 ? 2 : 1));
return (b0 << 1) | b1;
}
/** Decode mb_reference_index, table 44 unary (8.4.3 j), 8.4.4.2 f)). */
static int aec_ref_index(AVSContext *h, int ctx_inc, int max)
{
if (ff_cavs_aec_decode_decision(&h->aec,
AEC_MB_REFERENCE_INDEX + ctx_inc))
return 0;
if (h->cur.f->pict_type == AV_PICTURE_TYPE_B)
return 1;
if (ff_cavs_aec_decode_decision(&h->aec, AEC_MB_REFERENCE_INDEX + 4))
return 1;
for (int v = 2; v <= max; v++)
if (ff_cavs_aec_decode_decision(&h->aec, AEC_MB_REFERENCE_INDEX + 5))
return v;
av_log(h->avctx, AV_LOG_ERROR, "mb_reference_index out of range\n");
return AVERROR_INVALIDDATA;
}
/**
* Decode one mv_diff_x or mv_diff_y (table 49, 8.4.4.2 g)); mvda is the
* magnitude of the same component of the left block's mv_diff.
*/
static int aec_mv_diff(AVSContext *h, int base, int mvda, int *diff)
{
int v;
if (!ff_cavs_aec_decode_decision(&h->aec,
base + (mvda < 2 ? 0 :
mvda < 16 ? 1 : 2))) {
*diff = 0; /* mvdSign is not coded for mvdAbs 0 */
return 0;
}
if (!ff_cavs_aec_decode_decision(&h->aec, base + 3)) {
v = 1;
} else if (!ff_cavs_aec_decode_decision(&h->aec, base + 4)) {
v = 2;
} else {
int even = ff_cavs_aec_decode_decision(&h->aec, base + 5);
int k = 0;
while (!ff_cavs_aec_decode_bypass(&h->aec)) {
if (++k > 11) {
av_log(h->avctx, AV_LOG_ERROR, "mv_diff out of range\n");
return AVERROR_INVALIDDATA;
}
}
v = (1 << k) - 1;
while (k--)
v += ff_cavs_aec_decode_bypass(&h->aec) << k;
v = 3 + 2 * v + even;
}
if (ff_cavs_aec_decode_bypass(&h->aec)) /* mvdSign */
v = -v;
if (v < -4096 || v > 4095) {
av_log(h->avctx, AV_LOG_ERROR, "mv_diff %d out of range\n", v);
return AVERROR_INVALIDDATA;
}
*diff = v;
return 0;
}
/**
* Decode a motion vector's mv_diff pair into the cache that
* ff_cavs_mv() reads and the next block takes its mvda from.
*/
static int aec_mv(AVSContext *h, enum cavs_mv_loc nP)
{
for (int i = 0; i < 2; i++) {
int base = i ? AEC_MV_DIFF_Y : AEC_MV_DIFF_X;
int diff;
int ret = aec_mv_diff(h, base, FFABS(h->mvd[nP - 1][i]), &diff);
if (ret < 0)
return ret;
h->mvd[nP][i] = diff;
}
return 0;
}
/**
* Decode intra_luma_pred_mode (table 47) and derive IntraLumaPredMode
* from predIntraPredMode per clause 9.4.4.2 a).
*/
static int aec_intra_luma_pred_mode(AVSContext *h, int pred)
{
int v = 0;
while (v < 4 &&
!ff_cavs_aec_decode_decision(&h->aec, AEC_INTRA_LUMA_PRED_MODE + v))
v++;
if (v == 0)
return pred;
if (v == 4) /* 4 stands for 0 (9.4.4.2 a) 2)) */
v = 0;
return v < pred ? v : v + 1;
}
/**
* Decode intra_chroma_pred_mode (table 48, 8.4.4.2 e)).
* @return IntraChromaPredMode, 0 to 3 (table 60)
*/
static int aec_intra_chroma_pred_mode(AVSContext *h)
{
/* a and b of 8.4.4.2 e); non-intra neighbours hold INTRA_C_LP */
const int a = (h->flags & A_AVAIL) &&
h->left_c_pred_mode != INTRA_C_LP;
const int b = (h->flags & B_AVAIL) &&
h->top_c_pred_mode[h->mbx] != INTRA_C_LP;
int v;
if (!ff_cavs_aec_decode_decision(&h->aec,
AEC_INTRA_CHROMA_PRED_MODE + a + b))
v = 0;
else if (!ff_cavs_aec_decode_decision(&h->aec,
AEC_INTRA_CHROMA_PRED_MODE + 3))
v = 1;
else
v = 2 + ff_cavs_aec_decode_decision(&h->aec,
AEC_INTRA_CHROMA_PRED_MODE + 3);
h->left_c_pred_mode = v;
h->top_c_pred_mode[h->mbx] = v;
return v;
}
/**
* Decode cbp (table 50, 8.4.4.2 h), clause 9.4.7).
* @return MbCBP, a six bit mask over the block order numbers
*/
static int aec_cbp(AVSContext *h)
{
const int left = (h->flags & A_AVAIL) ? ~h->left_cbp : 0;
const int top = (h->flags & B_AVAIL) ? ~h->top_cbp[h->mbx] : 0;
int cbp = 0;
int a, b;
a = (left >> 1) & 1; /* left macroblock, block 1 */
b = (top >> 2) & 1; /* above macroblock, block 2 */
cbp |= ff_cavs_aec_decode_decision(&h->aec, AEC_CBP + a + 2 * b) << 0;
a = ~cbp & 1; /* this macroblock, block 0 */
b = (top >> 3) & 1; /* above macroblock, block 3 */
cbp |= ff_cavs_aec_decode_decision(&h->aec, AEC_CBP + a + 2 * b) << 1;
a = (left >> 3) & 1; /* left macroblock, block 3 */
b = ~cbp & 1; /* this macroblock, block 0 */
cbp |= ff_cavs_aec_decode_decision(&h->aec, AEC_CBP + a + 2 * b) << 2;
a = (~cbp >> 2) & 1; /* this macroblock, block 2 */
b = (~cbp >> 1) & 1; /* this macroblock, block 1 */
cbp |= ff_cavs_aec_decode_decision(&h->aec, AEC_CBP + a + 2 * b) << 3;
if (ff_cavs_aec_decode_decision(&h->aec, AEC_CBP + 4)) {
if (ff_cavs_aec_decode_decision(&h->aec, AEC_CBP + 5))
cbp |= 3 << 4;
else
cbp |= 1 << (4 + ff_cavs_aec_decode_decision(&h->aec, AEC_CBP + 5));
}
h->left_cbp = cbp;
h->top_cbp[h->mbx] = cbp;
return cbp;
}
/**
* Decode mb_qp_delta (table 44 unary, 8.4.4.2 i)) and map the code
* number to the signed delta of clause 9.4.8.
*/
static int aec_mb_qp_delta(AVSContext *h, int *delta)
{
int ctx = AEC_MB_QP_DELTA + (h->prev_delta_qp != 0);
int v = 0;
while (!ff_cavs_aec_decode_decision(&h->aec, ctx)) {
v++;
ctx = AEC_MB_QP_DELTA + (v == 1 ? 2 : 3);
if (v > 64) {
av_log(h->avctx, AV_LOG_ERROR, "mb_qp_delta out of range\n");
return AVERROR_INVALIDDATA;
}
}
if (v)
v = (v & 1) ? (v + 1) / 2 : -((v + 1) / 2);
if (v < -32 || v > 31) {
av_log(h->avctx, AV_LOG_ERROR, "mb_qp_delta out of range\n");
return AVERROR_INVALIDDATA;
}
*delta = v;
return 0;
}
/**
* Decode the trans_coefficient pairs of one 8x8 block (8.4.4.2 j) and k)).
* @param chroma selects the chroma half of the context sets of table 51
*/
static int decode_residual_block_aec(AVSContext *h, int chroma, int qp,
uint8_t *dst, ptrdiff_t stride)
{
int16_t level_buf[65];
uint8_t run_buf[65];
int16_t *block = h->block;
int lmax = 0, pos = 0, i, base, ret;
if (h->pic_structure)
base = chroma ? AEC_COEFF_FRAME_CHROMA : AEC_COEFF_FRAME_LUMA;
else
base = chroma ? AEC_COEFF_FIELD_CHROMA : AEC_COEFF_FIELD_LUMA;
for (i = 0; i < 65; i++) {
const int pri = cavs_aec_pri_idx[FFMIN(lmax, 5)];
int ctx_lvl = ff_cavs_aec_ctx_idx(base, AEC_COEFF_NUM_CTX,
pri * 3 - (pri != 0));
int ctx_run = ff_cavs_aec_ctx_idx(base + AEC_COEFF_RUN,
AEC_COEFF_RUN_NUM_CTX, pri * 4);
int abs_level, run_val;
if (ctx_lvl < 0 || ctx_run < 0)
return FFMIN(ctx_lvl, ctx_run);
if (get_bits_left(&h->gb) <= 0)
return AVERROR_INVALIDDATA;
/* coeffLevel, table 44 unary; secIdx as in IEEE 1857-2023 table 36,
* whose lMax == 0 column has no secIdx 2 */
if (!lmax) {
abs_level = 0;
if (!ff_cavs_aec_decode_decision(&h->aec, ctx_lvl)) {
do {
abs_level++;
if (abs_level >= CAVS_MAX_ABS_LEVEL) {
av_log(h->avctx, AV_LOG_ERROR, "AbsLevel too large\n");
return AVERROR_INVALIDDATA;
}
} while (!ff_cavs_aec_decode_decision(&h->aec, ctx_lvl + 1));
}
abs_level++; /* clause 9.5.2 a) */
} else {
int ctx_w = ff_cavs_aec_ctx_idx(base, AEC_COEFF_NUM_CTX,
14 + (pos >> 1));
if (ctx_w < 0)
return ctx_w;
if (ff_cavs_aec_decode_decision_w(&h->aec, ctx_lvl, ctx_w))
break; /* AbsLevel 0, end of block */
abs_level = 1;
if (!ff_cavs_aec_decode_decision(&h->aec, ctx_lvl + 1)) {
do {
abs_level++;
if (abs_level > CAVS_MAX_ABS_LEVEL) {
av_log(h->avctx, AV_LOG_ERROR, "AbsLevel too large\n");
return AVERROR_INVALIDDATA;
}
} while (!ff_cavs_aec_decode_decision(&h->aec, ctx_lvl + 2));
}
}
if (ff_cavs_aec_decode_bypass(&h->aec))
level_buf[i] = -abs_level;
else
level_buf[i] = abs_level;
if (level_buf[i] < -CAVS_MAX_ABS_LEVEL ||
level_buf[i] >= CAVS_MAX_ABS_LEVEL) {
av_log(h->avctx, AV_LOG_ERROR,
"coefficient level out of range\n");
return AVERROR_INVALIDDATA;
}
ctx_run += abs_level > 1 ? 2 : 0;
run_val = 0;
if (!ff_cavs_aec_decode_decision(&h->aec, ctx_run)) {
do {
run_val++;
if (run_val > 64) {
av_log(h->avctx, AV_LOG_ERROR, "RunVal too large\n");
return AVERROR_INVALIDDATA;
}
} while (!ff_cavs_aec_decode_decision(&h->aec, ctx_run + 1));
}
run_buf[i] = run_val + 1; /* scan positions consumed, 9.5.3 b) */
/* lMax is updated with this coefficient before the next pair */
lmax = FFMAX(lmax, abs_level);
pos = FFMIN(pos + run_val + 1, 63);
}
ret = dequant(h, level_buf, run_buf, block, dequant_mul[qp],
dequant_shift[qp], i);
if (ret >= 0)
h->cdsp.cavs_idct8_add(dst, block, stride);
h->bdsp.clear_block(block);
return ret;
}
/**
* Tell whether the byte aligned 00 00 01 at @p offset is a start code: in a
* de-emulated payload it may be a coincidence (annex A).
*/
static int is_start_code_offset(AVSContext *h, int offset)
{
int lo = 0, hi = h->nb_stc_offset;
if (h->gb.buffer != h->deemulated_buf)
return 1;
/* stc_offset[] is sorted; a crafted payload can hold one every 4 bytes */
while (lo < hi) {
int mid = lo + (hi - lo) / 2;
if (h->stc_offset[mid] == offset)
return 1;
if (h->stc_offset[mid] < offset)
lo = mid + 1;
else
hi = mid;
}
return 0;
}
/**
* Position the reader on the start code that ends an AEC slice: the first
* one at or after the slice's own payload. The reader position is not
* reliable: the arithmetic decoder's look ahead has run past it.
*/
static void aec_end_of_slice(AVSContext *h)
{
GetBitContext *gb = &h->gb;
const uint8_t *buf = gb->buffer;
int size = gb->size_in_bits >> 3;
int i = h->aec_start;
/* release gb; check_for_slice() waits for this */
h->aec.gb = NULL;
for (; i + 2 < size; i++)
if (!buf[i] && !buf[i + 1] && buf[i + 2] == 1 &&
is_start_code_offset(h, i))
break;
if (init_get_bits8(gb, buf, size) >= 0)
skip_bits_long(gb, i * 8);
}
/**
* Read mb_qp_delta when the macroblock has coefficients and the picture's qp
* is not fixed, and keep PreviousDeltaQP for the AEC contexts (clause 9.4.8).
*/
static int decode_mb_qp_delta(AVSContext *h)
{
int delta = 0;
if (h->cbp && !h->qp_fixed) {
if (h->aec_enable) {
int ret = aec_mb_qp_delta(h, &delta);
if (ret < 0)
return ret;
} else {
delta = get_se_golomb(&h->gb);
}
h->qp = (h->qp + (unsigned)delta) & 63;
}
h->prev_delta_qp = delta;
return 0;
}
/** Decode one 8x8 block's residual with the picture's entropy coder. */
static int decode_residual(AVSContext *h, const struct dec_2dvlc *r,
int esc_golomb_order, int chroma, int qp,
uint8_t *dst, ptrdiff_t stride)
{
if (h->aec_enable)
return decode_residual_block_aec(h, chroma, qp, dst, stride);
return decode_residual_block(h, &h->gb, r, esc_golomb_order, qp, dst,
stride);
}
static inline int decode_residual_chroma(AVSContext *h)
{
const int qp = ff_cavs_chroma_qp[h->qp];
int ret;
if (h->cbp & (1 << 4)) {
ret = decode_residual(h, chroma_dec, 0, 1, qp, h->cu, h->c_stride);
if (ret < 0)
return ret;
}
if (h->cbp & (1 << 5)) {
ret = decode_residual(h, chroma_dec, 0, 1, qp, h->cv, h->c_stride);
if (ret < 0)
return ret;
}
return 0;
}
static inline int decode_residual_inter(AVSContext *h)
{
int block, ret;
if (h->aec_enable) {
h->cbp = aec_cbp(h);
} else {
/* get coded block pattern */
int cbp = get_ue_golomb(&h->gb);
if (cbp > 63U) {
av_log(h->avctx, AV_LOG_ERROR, "illegal inter cbp %d\n", cbp);
return AVERROR_INVALIDDATA;
}
h->cbp = cbp_tab[cbp][1];
}
ret = decode_mb_qp_delta(h);
if (ret < 0)
return ret;
for (block = 0; block < 4; block++)
if (h->cbp & (1 << block)) {
ret = decode_residual(h, inter_dec, 0, 0, h->qp,
h->cy + h->luma_scan[block], h->l_stride);
if (ret < 0)
return ret;
}
return decode_residual_chroma(h);
}
/*****************************************************************************
*
* macroblock level
*
****************************************************************************/
static inline void set_mv_intra(AVSContext *h)
{
h->mv[MV_FWD_X0] = CAVS_INTRA_MV;
set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
h->mv[MV_BWD_X0] = CAVS_INTRA_MV;
set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
if (h->cur.f->pict_type != AV_PICTURE_TYPE_B)
h->col_type_base[h->mbidx] = I_8X8;
}
static int decode_mb_i(AVSContext *h, int cbp_code)
{
GetBitContext *gb = &h->gb;
unsigned pred_mode_uv;
int block;
uint8_t top[18];
uint8_t *left = NULL;
uint8_t *d;
int ret;
ff_cavs_init_mb(h);
h->left_mb_type = I_8X8;
h->top_mb_type[h->mbx] = I_8X8;
/* get intra prediction modes from stream */
for (block = 0; block < 4; block++) {
int nA, nB, predpred;
int pos = scan3x3[block];
nA = h->pred_mode_Y[pos - 1];
nB = h->pred_mode_Y[pos - 3];
predpred = FFMIN(nA, nB);
if (predpred == NOT_AVAIL) // if either is not available
predpred = INTRA_L_LP;
if (h->aec_enable) {
predpred = aec_intra_luma_pred_mode(h, predpred);
} else if (!get_bits1(gb)) {
int rem_mode = get_bits(gb, 2);
predpred = rem_mode + (rem_mode >= predpred);
}
h->pred_mode_Y[pos] = predpred;
}
if (h->aec_enable) {
pred_mode_uv = aec_intra_chroma_pred_mode(h);
} else {
pred_mode_uv = get_ue_golomb_31(gb);
if (pred_mode_uv > 6) {
av_log(h->avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
return AVERROR_INVALIDDATA;
}
}
ff_cavs_modify_mb_i(h, &pred_mode_uv);
/* get coded block pattern */
if (h->aec_enable) {
/* under AEC an intra MB codes cbp too (table 26, clause 9.4.7) */
h->cbp = aec_cbp(h);
} else {
/* an I picture's second field codes cbp in mb_type (9.4.2 a) 2)) */
if (h->cur.f->pict_type == AV_PICTURE_TYPE_I && !h->field)
cbp_code = get_ue_golomb(gb);
if (cbp_code > 63U) {
av_log(h->avctx, AV_LOG_ERROR, "illegal intra cbp\n");
return AVERROR_INVALIDDATA;
}
h->cbp = cbp_tab[cbp_code][0];
}
ret = decode_mb_qp_delta(h);
if (ret < 0)
return ret;
/* luma intra prediction interleaved with residual decode/transform/add */
for (block = 0; block < 4; block++) {
d = h->cy + h->luma_scan[block];
ff_cavs_load_intra_pred_luma(h, top, &left, block);
h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]
(d, top, left, h->l_stride);
if (h->cbp & (1<<block)) {
ret = decode_residual(h, intra_dec, 1, 0, h->qp, d, h->l_stride);
if (ret < 0)
return ret;
}
}
/* chroma intra prediction */
ff_cavs_load_intra_pred_chroma(h);
h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx * 10],
h->left_border_u, h->c_stride);
h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx * 10],
h->left_border_v, h->c_stride);
ret = decode_residual_chroma(h);
if (ret < 0)
return ret;
ff_cavs_filter(h, I_8X8);
set_mv_intra(h);
return 0;
}
static inline void set_intra_mode_default(AVSContext *h)
{
if (h->stream_revision > 0) {
h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = NOT_AVAIL;
} else {
h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = INTRA_L_LP;
}
}
/**
* Read one mb_reference_index and turn it into a reference list index
* (table 26, clauses 7.2.5 and 9.4.5). Table 26 misprints the presence
* predicate's brackets; GB/T 20090.2-2013 table 27 and IEEE 1857-2023
* clause 7.1.5 both print it as implemented here.
*/
static int decode_ref_index(AVSContext *h, int list, enum cavs_mv_loc nP)
{
const int base = h->ref_base[list];
/* NumberOfReference of one direction, clause 9.4.5 figures 15 to 20 */
const int max = !h->pic_structure &&
h->cur.f->pict_type == AV_PICTURE_TYPE_P ? 3 : 1;
int idx = 0;
if (!h->ref_flag &&
(h->cur.f->pict_type == AV_PICTURE_TYPE_P ||
(h->cur.f->pict_type == AV_PICTURE_TYPE_B && !h->pic_structure))) {
if (h->aec_enable) {
/* a and b of 8.4.4.2 f); unavailable, intra and derived
* neighbours carry index 0 */
int a = h->mv[nP - 1].ref_idx > 0;
int b = h->mv[nP - 4].ref_idx > 0;
idx = aec_ref_index(h, a + 2 * b, max);
if (idx < 0)
return idx;
} else {
idx = get_bits(&h->gb, max > 1 ? 2 : 1);
}
}
h->mv[nP].ref = base + idx;
h->mv[nP].ref_idx = idx;
return base + idx;
}
/**
* Decode one motion vector: under AEC its mv_diff must be read before
* ff_cavs_mv() overwrites the cache its context comes from.
*/
static int decode_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
enum cavs_mv_pred mode, enum cavs_block size, int ref)
{
if (h->aec_enable && mode < MV_PRED_PSKIP) {
int ret = aec_mv(h, nP);
if (ret < 0)
return ret;
}
ff_cavs_mv(h, nP, nC, mode, size, ref);
return 0;
}
/* what the AEC contexts of later macroblocks read about this one (8.4.4.2) */
static void set_inter_mb_ctx(AVSContext *h, enum cavs_mb mb_type, int skip)
{
h->left_mb_type = mb_type;
h->top_mb_type[h->mbx] = mb_type;
h->left_c_pred_mode = INTRA_C_LP;
h->top_c_pred_mode[h->mbx] = INTRA_C_LP;
if (skip) {
h->left_cbp = 0;
h->top_cbp[h->mbx] = 0;
h->prev_delta_qp = 0;
}
}
#define MV(nP, nC, mode, size, ref) \
do { \
ret = decode_mv(h, nP, nC, mode, size, ref); \
if (ret < 0) \
return ret; \
} while (0)
#define REF(dst, list, nP) \
do { \
ret = decode_ref_index(h, list, nP); \
if (ret < 0) \
return ret; \
dst = ret; \
} while (0)
static int decode_mb_p(AVSContext *h, enum cavs_mb mb_type)
{
int ref[4];
int ret;
ff_cavs_init_mb(h);
set_inter_mb_ctx(h, mb_type, mb_type == P_SKIP);
switch (mb_type) {
case P_SKIP:
MV(MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, h->ref_base[0]);
break;
case P_16X16:
REF(ref[0], 0, MV_FWD_X0);
MV(MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0]);
break;
case P_16X8:
REF(ref[0], 0, MV_FWD_X0);
REF(ref[2], 0, MV_FWD_X2);
MV(MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]);
MV(MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]);
break;
case P_8X16:
REF(ref[0], 0, MV_FWD_X0);
REF(ref[1], 0, MV_FWD_X1);
MV(MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]);
MV(MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);
break;
case P_8X8:
REF(ref[0], 0, MV_FWD_X0);
REF(ref[1], 0, MV_FWD_X1);
REF(ref[2], 0, MV_FWD_X2);
REF(ref[3], 0, MV_FWD_X3);
MV(MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]);
MV(MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]);
MV(MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]);
MV(MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]);
break;
default:
av_log(h->avctx, AV_LOG_ERROR, "Invalid mb_type %d in P frame\n",
mb_type);
return AVERROR_INVALIDDATA;
}
ff_cavs_inter(h, mb_type);
set_intra_mode_default(h);
store_mvs(h);
if (mb_type != P_SKIP) {
ret = decode_residual_inter(h);
if (ret < 0)
return ret;
}
ff_cavs_filter(h, mb_type);
h->col_type_base[h->mbidx] = mb_type;
return 0;
}
static int decode_mb_b(AVSContext *h, enum cavs_mb mb_type)
{
int block;
enum cavs_sub_mb sub_type[4];
int flags;
int ref[2][4];
int ret;
/* the co-located macroblock of an enhanced second field is the one at
* the same position in the first field (clause 9.9.1 b) 1)) */
int col = h->mbidx - (h->b_field_enhanced && h->field ?
h->mb_width * h->mb_height / 2 : 0);
ff_cavs_init_mb(h);
set_inter_mb_ctx(h, mb_type, mb_type == B_SKIP);
/* reset all MVs */
h->mv[MV_FWD_X0] = CAVS_DIR_MV;
set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
h->mv[MV_BWD_X0] = CAVS_DIR_MV;
set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
switch (mb_type) {
case B_SKIP:
case B_DIRECT:
if (!h->col_type_base[col]) {
/* intra MB at co-location: in-plane prediction (9.9.1 b) 1)) */
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16,
h->ref_base[0]);
ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16,
h->ref_base[1]);
} else
/* direct prediction from co-located P MB, block-wise */
for (block = 0; block < 4; block++)
mv_pred_direct(h, &h->mv[mv_scan[block]],
&h->col_mv[col * 4 + block]);
break;
case B_FWD_16X16:
REF(ref[0][0], 0, MV_FWD_X0);
MV(MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0][0]);
break;
case B_SYM_16X16:
REF(ref[0][0], 0, MV_FWD_X0);
MV(MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0][0]);
mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
break;
case B_BWD_16X16:
REF(ref[1][0], 1, MV_BWD_X0);
MV(MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[1][0]);
break;
case B_8X8:
#define TMP_UNUSED_INX 7
flags = 0;
for (block = 0; block < 4; block++) {
if (h->aec_enable)
sub_type[block] = aec_mb_part_type(h);
else
sub_type[block] = get_bits(&h->gb, 2);
}
/* all forward reference indices come first (table 26) */
for (block = 0; block < 4; block++)
if (sub_type[block] == B_SUB_FWD || sub_type[block] == B_SUB_SYM)
REF(ref[0][block], 0, mv_scan[block]);
for (block = 0; block < 4; block++)
if (sub_type[block] == B_SUB_BWD)
REF(ref[1][block], 1, mv_scan[block] + MV_BWD_OFFS);
for (block = 0; block < 4; block++) {
switch (sub_type[block]) {
case B_SUB_DIRECT:
if (!h->col_type_base[col]) {
/* intra MB at co-location, do in-plane prediction */
if(flags==0) {
// if col-MB is a Intra MB, current Block size is 16x16.
// AVS standard section 9.9.1
if(block>0){
h->mv[TMP_UNUSED_INX ] = h->mv[MV_FWD_X0 ];
h->mv[TMP_UNUSED_INX + MV_BWD_OFFS] = h->mv[MV_FWD_X0 + MV_BWD_OFFS];
}
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2,
MV_PRED_BSKIP, BLK_8X8, h->ref_base[0]);
ff_cavs_mv(h, MV_FWD_X0+MV_BWD_OFFS,
MV_FWD_C2+MV_BWD_OFFS,
MV_PRED_BSKIP, BLK_8X8, h->ref_base[1]);
if(block>0) {
flags = mv_scan[block];
h->mv[flags ] = h->mv[MV_FWD_X0 ];
h->mv[flags + MV_BWD_OFFS] = h->mv[MV_FWD_X0 + MV_BWD_OFFS];
h->mv[MV_FWD_X0 ] = h->mv[TMP_UNUSED_INX ];
h->mv[MV_FWD_X0 + MV_BWD_OFFS] = h->mv[TMP_UNUSED_INX + MV_BWD_OFFS];
} else
flags = MV_FWD_X0;
} else {
h->mv[mv_scan[block] ] = h->mv[flags ];
h->mv[mv_scan[block] + MV_BWD_OFFS] = h->mv[flags + MV_BWD_OFFS];
}
} else
mv_pred_direct(h, &h->mv[mv_scan[block]],
&h->col_mv[col * 4 + block]);
break;
case B_SUB_FWD:
MV(mv_scan[block], mv_scan[block] - 3,
MV_PRED_MEDIAN, BLK_8X8, ref[0][block]);
break;
case B_SUB_SYM:
MV(mv_scan[block], mv_scan[block] - 3,
MV_PRED_MEDIAN, BLK_8X8, ref[0][block]);
mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
break;
}
}
#undef TMP_UNUSED_INX
for (block = 0; block < 4; block++) {
if (sub_type[block] == B_SUB_BWD)
MV(mv_scan[block] + MV_BWD_OFFS,
mv_scan[block] + MV_BWD_OFFS - 3,
MV_PRED_MEDIAN, BLK_8X8, ref[1][block]);
}
break;
default:
if (mb_type <= B_SYM_16X16) {
av_log(h->avctx, AV_LOG_ERROR, "Invalid mb_type %d in B frame\n", mb_type);
return AVERROR_INVALIDDATA;
}
av_assert2(mb_type < B_8X8);
flags = ff_cavs_partition_flags[mb_type];
if (mb_type & 1) { /* 16x8 macroblock types */
if (flags & FWD0)
REF(ref[0][0], 0, MV_FWD_X0);
if (flags & FWD1)
REF(ref[0][2], 0, MV_FWD_X2);
if (flags & BWD0)
REF(ref[1][0], 1, MV_BWD_X0);
if (flags & BWD1)
REF(ref[1][2], 1, MV_BWD_X2);
if (flags & FWD0)
MV(MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0][0]);
if (flags & SYM0)
mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
if (flags & FWD1)
MV(MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[0][2]);
if (flags & SYM1)
mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
if (flags & BWD0)
MV(MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, ref[1][0]);
if (flags & BWD1)
MV(MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, ref[1][2]);
} else { /* 8x16 macroblock types */
if (flags & FWD0)
REF(ref[0][0], 0, MV_FWD_X0);
if (flags & FWD1)
REF(ref[0][1], 0, MV_FWD_X1);
if (flags & BWD0)
REF(ref[1][0], 1, MV_BWD_X0);
if (flags & BWD1)
REF(ref[1][1], 1, MV_BWD_X1);
if (flags & FWD0)
MV(MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0][0]);
if (flags & SYM0)
mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
if (flags & FWD1)
MV(MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[0][1]);
if (flags & SYM1)
mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
if (flags & BWD0)
MV(MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, ref[1][0]);
if (flags & BWD1)
MV(MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1][1]);
}
}
ff_cavs_inter(h, mb_type);
set_intra_mode_default(h);
if (mb_type != B_SKIP) {
ret = decode_residual_inter(h);
if (ret < 0)
return ret;
}
ff_cavs_filter(h, mb_type);
return 0;
}
#undef MV
#undef REF
/**
* Decode one macroblock of a P or B coded macroblock layer, table 25.
* @param skip_count what is left of the current mb_skip_run, or -1 when the
* next macroblock position starts a new one
*/
static int decode_mb_pb_layer(AVSContext *h, int *skip_count)
{
const int b = h->cur.f->pict_type == AV_PICTURE_TYPE_B;
const enum cavs_mb skip = b ? B_SKIP : P_SKIP;
const enum cavs_mb last = b ? B_8X8 : P_8X8;
enum cavs_mb mb_type;
int skipped, ret;
if (h->skip_mode_flag && *skip_count < 0) {
if (h->aec_enable) {
*skip_count = aec_mb_skip_run(h);
} else {
if (get_bits_left(&h->gb) < 1)
return AVERROR_INVALIDDATA;
*skip_count = get_ue_golomb(&h->gb);
}
if (*skip_count < 0)
return AVERROR_INVALIDDATA;
}
skipped = h->skip_mode_flag && (*skip_count)--;
if (skipped) {
mb_type = skip;
} else if (h->aec_enable) {
ret = b ? aec_mb_type_b(h) : aec_mb_type_p(h);
if (ret < 0)
return ret;
mb_type = ret + skip;
} else {
if (get_bits_left(&h->gb) < 1)
return AVERROR_INVALIDDATA;
mb_type = get_ue_golomb(&h->gb) + skip + h->skip_mode_flag;
}
if (mb_type > last)
ret = decode_mb_i(h, mb_type - last - 1);
else
ret = b ? decode_mb_b(h, mb_type) : decode_mb_p(h, mb_type);
if (ret < 0)
return ret;
/* the stuffing bit follows a coded MB and the last one of a skip run */
if (h->aec_enable && (!skipped || !*skip_count) &&
ff_cavs_aec_decode_stuffing_bit(&h->aec))
aec_end_of_slice(h);
return 0;
}
/*****************************************************************************
*
* slice level
*
****************************************************************************/
static inline int decode_slice_header(AVSContext *h, GetBitContext *gb)
{
int mby = h->stc;
/* over 2800 lines MbRow carries high bits here (clause 7.2.4) */
if (h->height > 2800)
mby += get_bits(gb, 3) << 7; //slice_vertical_position_extension
if (mby >= h->mb_height) {
av_log(h->avctx, AV_LOG_ERROR, "MbRow %d is too large\n", mby);
return AVERROR_INVALIDDATA;
}
h->mby = mby;
h->mbidx = h->mby * h->mb_width;
/* the second field's first slice jumps to MbHeight / 2 (clause 3.24) */
ff_cavs_set_mb_row(h);
/* mark top macroblocks as unavailable */
h->flags &= ~(B_AVAIL | C_AVAIL);
if (!h->pic_qp_fixed) {
h->qp_fixed = get_bits1(gb);
h->qp = get_bits(gb, 6);
}
/* inter frame or second slice can have weighting params */
if ((h->cur.f->pict_type != AV_PICTURE_TYPE_I) ||
(!h->pic_structure && h->mbidx >= h->mb_width * h->mb_height / 2))
if (get_bits1(gb)) { //slice_weighting_flag
avpriv_request_sample(h->avctx, "Weighted prediction");
return AVERROR_PATCHWELCOME;
}
return 0;
}
static inline int check_for_slice(AVSContext *h)
{
GetBitContext *gb = &h->gb;
int align;
int ret;
if (h->mbx)
return 0;
/* an AEC slice ends with its stuffing bit, not at a start code (7.2.4) */
if (h->aec_enable && h->aec.gb)
return 0;
align = (-get_bits_count(gb)) & 7;
/* check for stuffing byte */
if (!align && (show_bits(gb, 8) == 0x80))
align = 8;
if ((show_bits_long(gb, 24 + align) & 0xFFFFFF) == 0x000001) {
GetBitContext peek;
int stc;
if (!is_start_code_offset(h, (get_bits_count(gb) + align) >> 3))
return 0;
peek = *gb;
skip_bits_long(&peek, 24 + align);
stc = get_bits(&peek, 8);
/* any other unit ends the picture's data; leave it to the caller */
if (stc > (SLICE_MAX_START_CODE & 0xFF)) {
h->pic_data_end = 1;
return 0;
}
*gb = peek;
h->stc = stc;
ret = decode_slice_header(h, gb);
if (ret < 0)
return ret;
if (h->aec_enable) {
/* aec_byte_alignment_bit padding, then 8.4.1 */
align_get_bits(gb);
h->aec_start = get_bits_count(gb) >> 3;
ff_cavs_aec_init(&h->aec, gb);
h->prev_delta_qp = 0; /* reset with PreviousQP, clause 9.3 */
}
return 1;
}
return 0;
}
/*****************************************************************************
*
* frame level
*
****************************************************************************/
/**
* Build the reference list and the temporal distances of the current frame
* or field (clause 9.4.5 figures 14 to 20, clause 9.4.6.1).
*/
static int set_ref_list(AVSContext *h)
{
/* the first coded field is the first displayed one (clause 7.2.3.1),
* and annex B.2 keeps top_field_first constant over the sequence */
const int f1 = !h->top_field_first; /* parity of a first field */
const int f2 = h->top_field_first; /* parity of a second field */
const int b = h->cur.f->pict_type == AV_PICTURE_TYPE_B;
const int poc = h->cur.poc;
const int poc0 = h->DPB[0].poc;
const int poc1 = h->DPB[1].poc;
int nref;
#define SET_REF(idx, frame, par, distance) \
do { \
h->ref[idx].f = (frame); \
h->ref[idx].parity = (par); \
h->dist[idx] = (distance) & 511; \
} while (0)
h->ref_base[0] = h->ref_base[1] = 0;
if (h->pic_structure) {
/* figures 15 and 18: whole frames, most recent first */
SET_REF(0, h->DPB[0].f, 0, b ? poc0 - poc : poc - poc0);
for (int i = 1; i < FF_ARRAY_ELEMS(h->ref); i++)
SET_REF(i, h->DPB[1].f, 0, poc - poc1);
/* figure 18: a B frame codes no reference index */
h->ref_base[0] = b;
nref = 1;
} else if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
/* figure 14: the second field references its own first field */
for (int i = 0; i < FF_ARRAY_ELEMS(h->ref); i++)
SET_REF(i, h->cur.f, f1, 1);
nref = 1;
} else if (!b) {
if (!h->field) {
/* figure 16: the four fields of the two previous frames */
SET_REF(0, h->DPB[0].f, f2, poc - poc0 - 1);
SET_REF(1, h->DPB[0].f, f1, poc - poc0);
SET_REF(2, h->DPB[1].f, f2, poc - poc1 - 1);
SET_REF(3, h->DPB[1].f, f1, poc - poc1);
} else {
/* figure 17: this picture's first field, then the three before */
SET_REF(0, h->cur.f, f1, 1);
SET_REF(1, h->DPB[0].f, f2, poc - poc0);
SET_REF(2, h->DPB[0].f, f1, poc - poc0 + 1);
SET_REF(3, h->DPB[1].f, f2, poc - poc1);
}
nref = 4;
} else {
/* figures 19 and 20: two backward and two forward fields */
SET_REF(0, h->DPB[0].f, f1, poc0 - poc - h->field);
SET_REF(1, h->DPB[0].f, f2, poc0 + 1 - poc - h->field);
SET_REF(2, h->DPB[1].f, f2, poc + h->field - poc1 - 1);
SET_REF(3, h->DPB[1].f, f1, poc + h->field - poc1);
h->ref_base[0] = 2;
nref = 2;
}
#undef SET_REF
for (int i = 0; i < FF_ARRAY_ELEMS(h->ref); i++)
h->scale_den[i] = h->dist[i] ? 512 / h->dist[i] : 0;
for (int i = 0; b && i < nref; i++) {
int fw = h->ref_base[0] + i;
int bw = h->pic_structure ? h->ref_base[1]
: h->ref_base[1] + 1 - i;
int factor = h->dist[bw] * h->scale_den[fw];
if (factor > 32768) {
av_log(h->avctx, AV_LOG_ERROR,
"symmetric scaling factor %d too large\n", factor);
return AVERROR_INVALIDDATA;
}
}
return 0;
}
static int decode_pic(AVSContext *h)
{
int ret;
int field;
int skip_count = -1;
int pb_field_enhanced_flag = 0;
if (!h->top_qp) {
av_log(h->avctx, AV_LOG_ERROR, "No sequence header decoded yet\n");
return AVERROR_INVALIDDATA;
}
av_frame_unref(h->cur.f);
skip_bits(&h->gb, 16);//bbv_delay
if (h->profile == AV_PROFILE_CAVS_BROADCASTING)
skip_bits(&h->gb, 8); //marker_bit, bbv_delay_extension (tables 21, 22)
if (h->stc == PIC_PB_START_CODE) {
h->cur.f->pict_type = get_bits(&h->gb, 2) + AV_PICTURE_TYPE_I;
if (h->cur.f->pict_type > AV_PICTURE_TYPE_B) {
av_log(h->avctx, AV_LOG_ERROR, "illegal picture type\n");
return AVERROR_INVALIDDATA;
}
/* make sure we have the reference frames we need */
if (!h->DPB[0].f->data[0] ||
(!h->DPB[1].f->data[0] && h->cur.f->pict_type == AV_PICTURE_TYPE_B))
return AVERROR_INVALIDDATA;
} else {
h->cur.f->pict_type = AV_PICTURE_TYPE_I;
if (get_bits1(&h->gb))
skip_bits(&h->gb, 24);//time_code
/* a Broadcasting stream always has the marker bit (table 21); old
JiZhun sample clips were all progressive and no low_delay, bump
stream revision if detected otherwise */
if (h->profile == AV_PROFILE_CAVS_BROADCASTING)
h->stream_revision = 1;
else if (h->low_delay || !(show_bits(&h->gb, 9) & 1))
h->stream_revision = 1;
/* similarly test top_field_first and repeat_first_field */
else if (show_bits(&h->gb, 11) & 3)
h->stream_revision = 1;
if (h->stream_revision > 0)
skip_bits(&h->gb, 1); //marker_bit
}
if (get_bits_left(&h->gb) < 23)
return AVERROR_INVALIDDATA;
ret = ff_get_buffer(h->avctx, h->cur.f, h->cur.f->pict_type == AV_PICTURE_TYPE_B ?
0 : AV_GET_BUFFER_FLAG_REF);
if (ret < 0)
return ret;
if (!h->edge_emu_buffer) {
int alloc_size = FFALIGN(FFABS(h->cur.f->linesize[0]) + 32, 32);
h->edge_emu_buffer = av_mallocz(alloc_size * 2 * 24);
if (!h->edge_emu_buffer)
return AVERROR(ENOMEM);
}
/* picture_distance; DistanceIndex is twice it (clause 9.4.6.1) */
h->cur.poc = get_bits(&h->gb, 8) * 2;
if (h->low_delay)
get_ue_golomb(&h->gb); //bbv_check_times
h->progressive = get_bits1(&h->gb);
h->pic_structure = 1;
if (!h->progressive)
h->pic_structure = get_bits1(&h->gb);
/* clause 7.2.3: a progressive sequence has frame pictures only; its odd
* MbHeight would also let a field picture write past coded_height */
if (!h->pic_structure && h->progressive_seq) {
av_log(h->avctx, AV_LOG_ERROR,
"field picture in a progressive sequence\n");
return AVERROR_INVALIDDATA;
}
/* a field coded picture uses inverse block scan method 2 (9.5.3 c)) */
h->scantable = h->pic_structure ? h->permutated_scantable
: h->permutated_scantable_field;
if (!h->pic_structure && h->stc == PIC_PB_START_CODE)
skip_bits1(&h->gb); //advanced_pred_mode_disable
h->top_field_first = get_bits1(&h->gb);
skip_bits1(&h->gb); //repeat_first_field
h->pic_qp_fixed =
h->qp_fixed = get_bits1(&h->gb);
h->qp = get_bits(&h->gb, 6);
if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
/* only a field coded intra picture has skip_mode_flag (table 21) */
h->skip_mode_flag = 0;
if (!h->progressive && !h->pic_structure)
h->skip_mode_flag = get_bits1(&h->gb);
skip_bits(&h->gb, 4); //reserved bits
} else {
if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))
h->ref_flag = get_bits1(&h->gb);
else
/* 1 for a frame coded B picture (clause 7.2.3.2) */
h->ref_flag = 1;
/* no_forward_reference_flag, pb_field_enhanced_flag, r(2); table 22.
* JiZhun has reserved bits here and must ignore them (clause 5.4) */
skip_bits1(&h->gb);
pb_field_enhanced_flag = get_bits1(&h->gb) &&
h->profile == AV_PROFILE_CAVS_BROADCASTING;
skip_bits(&h->gb, 2);
h->skip_mode_flag = get_bits1(&h->gb);
}
h->loop_filter_disable = get_bits1(&h->gb);
if (!h->loop_filter_disable && get_bits1(&h->gb)) {
h->alpha_offset = get_se_golomb(&h->gb);
h->beta_offset = get_se_golomb(&h->gb);
if ( h->alpha_offset < -64 || h->alpha_offset > 64
|| h-> beta_offset < -64 || h-> beta_offset > 64) {
h->alpha_offset = h->beta_offset = 0;
return AVERROR_INVALIDDATA;
}
} else {
h->alpha_offset = h->beta_offset = 0;
}
/* AWQ parameters and aec_enable end the header (tables 21, 22) */
h->aec_enable = 0;
if (h->profile == AV_PROFILE_CAVS_BROADCASTING) {
if (get_bits1(&h->gb)) { //weighting_quant_flag
avpriv_request_sample(h->avctx, "Adaptive weighted quantization");
return AVERROR_PATCHWELCOME;
}
h->aec_enable = get_bits1(&h->gb);
}
/* in a frame picture the field derivations reduce to the frame ones
* (9.9.1 b) 3)); PFieldSkip of 9.9.1 a) 1) is not implemented */
h->b_field_enhanced = pb_field_enhanced_flag && !h->pic_structure &&
h->cur.f->pict_type == AV_PICTURE_TYPE_B;
if (pb_field_enhanced_flag && !h->pic_structure &&
h->cur.f->pict_type == AV_PICTURE_TYPE_P) {
avpriv_request_sample(h->avctx, "Enhanced field coded P picture");
return AVERROR_PATCHWELCOME;
}
if (!h->progressive) {
h->cur.f->flags |= AV_FRAME_FLAG_INTERLACED;
if (h->top_field_first)
h->cur.f->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
}
/* needs picture_structure, so only after the whole header */
if ((ret = ff_cavs_init_pic(h)) < 0)
return ret;
if ((ret = set_ref_list(h)) < 0)
return ret;
field = h->field;
ret = 0;
h->aec.gb = NULL; /* started by the first slice header */
h->pic_data_end = 0;
do {
ret = check_for_slice(h);
if (ret < 0)
break;
if (ret)
skip_count = -1;
if (h->aec_enable && !h->aec.gb) {
av_log(h->avctx, AV_LOG_ERROR,
"AEC picture without a slice header\n");
ret = AVERROR_INVALIDDATA;
break;
}
/* past the picture's data, only a pending skip run can code MBs */
if (h->pic_data_end && !(h->skip_mode_flag && skip_count > 0)) {
av_log(h->avctx, AV_LOG_ERROR, "picture data ended before MB %d\n",
h->mbidx);
ret = AVERROR_INVALIDDATA;
break;
}
if (h->field != field) {
field = h->field;
if ((ret = set_ref_list(h)) < 0)
break;
}
if (h->cur.f->pict_type != AV_PICTURE_TYPE_I || h->field) {
/* an intra picture's second field is inter coded (9.4.2 a) 2)) */
ret = decode_mb_pb_layer(h, &skip_count);
} else {
ret = decode_mb_i(h, 0);
/* aec_mb_stuffing_bit is 1 on the slice's last MB (7.2.4) */
if (ret >= 0 && h->aec_enable &&
ff_cavs_aec_decode_stuffing_bit(&h->aec))
aec_end_of_slice(h);
}
if (ret < 0)
break;
} while (ff_cavs_next_mb(h));
if (ret >= 0 && h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
av_frame_unref(h->DPB[1].f);
FFSWAP(AVSFrame, h->cur, h->DPB[1]);
FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);
}
return ret;
}
/*****************************************************************************
*
* headers and interface
*
****************************************************************************/
static int decode_seq_header(AVSContext *h)
{
int frame_rate_code;
int profile, level, aspect_ratio;
int width, height;
int mb_width, mb_height;
int progressive_seq, low_delay;
int chroma_format, sample_precision;
int ret;
profile = get_bits(&h->gb, 8);
/* the sequence header is the same for both profiles (table 14) */
if (profile != AV_PROFILE_CAVS_JIZHUN &&
profile != AV_PROFILE_CAVS_BROADCASTING) {
avpriv_report_missing_feature(h->avctx, "Profile %#x", profile);
return AVERROR_PATCHWELCOME;
}
level = get_bits(&h->gb, 8);
progressive_seq = get_bits1(&h->gb);
width = get_bits(&h->gb, 14);
height = get_bits(&h->gb, 14);
if ((h->width || h->height) && (h->width != width || h->height != height)) {
avpriv_report_missing_feature(h->avctx,
"Width/height changing in CAVS");
return AVERROR_PATCHWELCOME;
}
if (width <= 0 || height <= 0) {
av_log(h->avctx, AV_LOG_ERROR, "Dimensions invalid\n");
return AVERROR_INVALIDDATA;
}
chroma_format = get_bits(&h->gb, 2);
sample_precision = get_bits(&h->gb, 3);
/* the Broadcasting macroblock layer is written for 8 bit 4:2:0 */
if (profile == AV_PROFILE_CAVS_BROADCASTING) {
if (sample_precision != 1) {
av_log(h->avctx, AV_LOG_ERROR,
"sample_precision %d is not 8 bit\n", sample_precision);
return AVERROR_INVALIDDATA;
}
if (chroma_format == 2) {
avpriv_request_sample(h->avctx, "4:2:2 chroma");
return AVERROR_PATCHWELCOME;
}
if (chroma_format != 1) {
av_log(h->avctx, AV_LOG_ERROR,
"chroma_format %d is reserved\n", chroma_format);
return AVERROR_INVALIDDATA;
}
}
aspect_ratio = get_bits(&h->gb, 4);
frame_rate_code = get_bits(&h->gb, 4);
if (frame_rate_code == 0 || frame_rate_code > 13) {
av_log(h->avctx, AV_LOG_WARNING,
"frame_rate_code %d is invalid\n", frame_rate_code);
frame_rate_code = 1;
}
skip_bits(&h->gb, 18); //bit_rate_lower
skip_bits1(&h->gb); //marker_bit
skip_bits(&h->gb, 12); //bit_rate_upper
low_delay = get_bits1(&h->gb);
mb_width = (width + 15) >> 4;
/* interlaced: an even number of MB rows (clause 7.2.2) */
mb_height = progressive_seq ? (height + 15) >> 4
: ((height + 31) >> 5) * 2;
/* the grid sizes the arrays of ff_cavs_init_top_lines(), allocated once */
if (h->top_qp && (mb_width != h->mb_width || mb_height != h->mb_height)) {
avpriv_report_missing_feature(h->avctx, "Macroblock grid changing");
return AVERROR_PATCHWELCOME;
}
/* horizontal_size and vertical_size are only the displayed part */
ret = ff_set_dimensions(h->avctx, mb_width * 16, mb_height * 16);
if (ret < 0)
return ret;
h->avctx->width = width;
h->avctx->height = height;
/* commit last: a rejected header must leave the decoder as it was */
h->profile = profile;
h->level = level;
h->aspect_ratio = aspect_ratio;
h->width = width;
h->height = height;
h->mb_width = mb_width;
h->mb_height = mb_height;
h->low_delay = low_delay;
h->avctx->profile = profile;
h->progressive_seq = progressive_seq;
h->avctx->framerate = ff_mpeg12_frame_rate_tab[frame_rate_code];
if (!h->top_qp)
return ff_cavs_init_top_lines(h);
return 0;
}
/** annex A applies to picture headers and slices, not to other units */
static int annex_a_applies(int stc)
{
return stc <= (SLICE_MAX_START_CODE & 0xFF) ||
stc == (PIC_I_START_CODE & 0xFF) ||
stc == (PIC_PB_START_CODE & 0xFF);
}
/**
* Copy one region of a picture payload, removing the annex A pseudo start
* codes; the clause 5.8.2.4 stuffing is rewritten to keep the next start
* code aligned. With pb NULL they are only counted.
* @return the number of pseudo start codes found
*/
static int deemulate_region(PutBitContext *pb, const uint8_t *buf, int size,
int deemulated)
{
int found = 0;
int stuffing = -1;
int i;
if (!deemulated) {
for (i = 0; i < size; i++)
if (pb)
put_bits(pb, 8, buf[i]);
return 0;
}
/* the stuffing bit is the last set bit of the region */
for (i = size; i > 0 && !buf[i - 1]; i--)
;
if (i > 0) {
stuffing = i - 1;
size = stuffing;
}
for (i = 0; i < size; i++) {
if (i + 2 < size && !buf[i] && !buf[i + 1] && buf[i + 2] == 2) {
/* drop the two low bits of the 02 */
if (pb) {
put_bits(pb, 16, 0);
put_bits(pb, 6, 0);
}
found++;
i += 2;
} else if (pb) {
put_bits(pb, 8, buf[i]);
}
}
if (pb) {
if (stuffing >= 0) {
int n = ff_ctz(buf[stuffing]) + 1;
if (n < 8)
put_bits(pb, 8 - n, buf[stuffing] >> n);
put_bits(pb, 1, 1); //stuffing_bit
}
align_put_bits(pb); /* stuffing_bit until byte aligned */
}
return found;
}
/**
* Walk the payload region by region, removing the annex A pseudo start
* codes; on the writing pass, record every start code prefix offset in
* h->stc_offset.
* @return the number of pseudo start codes found
*/
static int deemulate_picture(AVSContext *h, PutBitContext *pb,
const uint8_t *buf, int size)
{
int deemulated = 1; /* buf starts inside a picture header */
int found = 0;
int pos = 0;
while (pos < size) {
int end;
for (end = pos; end + 2 < size; end++) {
/* nothing can start at end, end + 1 or end + 2 (annex A) */
if (buf[end + 2] > 1) {
end += 2;
continue;
}
if (!buf[end] && !buf[end + 1] && buf[end + 2] == 1)
break;
}
if (end + 2 >= size)
end = size;
found += deemulate_region(pb, buf + pos, end - pos, deemulated);
if (end == size)
break;
if (pb) {
h->stc_offset[h->nb_stc_offset++] = put_bits_count(pb) >> 3;
put_bits(pb, 24, 1); /* start code prefix */
}
pos = end + 3;
if (pos < size) {
if (pb)
put_bits(pb, 8, buf[pos]);
deemulated = annex_a_applies(buf[pos]);
pos++;
}
}
return found;
}
/**
* Remove the annex A pseudo start codes from a payload: a byte forming
* 00 00 02 with the two before it loses its two least significant bits. buf
* runs from just after a picture start code to the packet end.
* @return the size of h->deemulated_buf, 0 if buf needs no copy, or < 0
*/
static int remove_pseudo_start_codes(AVSContext *h, const uint8_t *buf,
int size)
{
PutBitContext pb;
if (size <= 0 || size > INT_MAX / 8 ||
!deemulate_picture(h, NULL, buf, size))
return 0;
av_fast_padded_malloc(&h->deemulated_buf, &h->deemulated_buf_size, size);
if (!h->deemulated_buf)
return AVERROR(ENOMEM);
av_fast_malloc(&h->stc_offset, &h->stc_offset_size,
(size / 3 + 1) * sizeof(*h->stc_offset));
if (!h->stc_offset)
return AVERROR(ENOMEM);
h->nb_stc_offset = 0;
init_put_bits(&pb, h->deemulated_buf, size + AV_INPUT_BUFFER_PADDING_SIZE);
deemulate_picture(h, &pb, buf, size);
flush_put_bits(&pb);
av_assert0(put_bytes_output(&pb) <= size);
/* de-emulation shrinks, so restore the padding the reader over-reads */
memset(h->deemulated_buf + put_bytes_output(&pb), 0,
AV_INPUT_BUFFER_PADDING_SIZE);
return put_bytes_output(&pb);
}
static av_cold void cavs_flush(AVCodecContext * avctx)
{
AVSContext *h = avctx->priv_data;
h->got_keyframe = 0;
}
static int cavs_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
int *got_frame, AVPacket *avpkt)
{
AVSContext *h = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
uint32_t stc = -1;
int input_size, ret;
const uint8_t *buf_end;
const uint8_t *buf_ptr;
int frame_start = 0;
if (buf_size == 0) {
if (!h->low_delay && h->DPB[0].f->data[0]) {
*got_frame = 1;
av_frame_move_ref(rframe, h->DPB[0].f);
}
return 0;
}
h->stc = 0;
buf_ptr = buf;
buf_end = buf + buf_size;
for(;;) {
buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &stc);
if ((stc & 0xFFFFFE00) || buf_ptr == buf_end) {
if (!h->stc)
av_log(h->avctx, AV_LOG_WARNING, "no frame decoded\n");
return FFMAX(0, buf_ptr - buf);
}
input_size = buf_end - buf_ptr;
if ((ret = init_get_bits8(&h->gb, buf_ptr, input_size)) < 0)
return ret;
switch (stc) {
case CAVS_START_CODE:
ret = decode_seq_header(h);
if (ret < 0)
return ret;
break;
case PIC_I_START_CODE:
if (!h->got_keyframe) {
av_frame_unref(h->DPB[0].f);
av_frame_unref(h->DPB[1].f);
h->got_keyframe = 1;
}
av_fallthrough;
case PIC_PB_START_CODE:
if (frame_start > 1)
return AVERROR_INVALIDDATA;
frame_start ++;
if (*got_frame)
av_frame_unref(rframe);
*got_frame = 0;
if (!h->got_keyframe)
break;
/* annex A, normative for decoders */
ret = remove_pseudo_start_codes(h, buf_ptr, input_size);
if (ret < 0)
return ret;
if (ret > 0 &&
(ret = init_get_bits8(&h->gb, h->deemulated_buf, ret)) < 0)
return ret;
h->stc = stc;
ret = decode_pic(h);
if (ret < 0)
return ret;
*got_frame = 1;
if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
if (h->DPB[!h->low_delay].f->data[0]) {
if ((ret = av_frame_ref(rframe, h->DPB[!h->low_delay].f)) < 0)
return ret;
} else {
*got_frame = 0;
}
} else {
av_frame_move_ref(rframe, h->cur.f);
}
break;
case EXT_START_CODE:
//mpeg_decode_extension(avctx, buf_ptr, input_size);
break;
case USER_START_CODE:
//mpeg_decode_user_data(avctx, buf_ptr, input_size);
break;
default:
/* slice start codes are consumed by check_for_slice() */
break;
}
}
}
const FFCodec ff_cavs_decoder = {
.p.name = "cavs",
CODEC_LONG_NAME("Chinese AVS (Audio Video Standard) (AVS1-P2/P16)"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_CAVS,
.priv_data_size = sizeof(AVSContext),
.init = ff_cavs_init,
.close = ff_cavs_end,
FF_CODEC_DECODE_CB(cavs_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
.flush = cavs_flush,
.p.profiles = NULL_IF_CONFIG_SMALL(ff_cavs_profiles),
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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