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FFmpeg4/libavcodec/cavsdec.c

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2023-07-02 12:20:28 +00:00
/*
* Chinese AVS video (AVS1-P2, JiZhun profile) 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, JiZhun profile) decoder
* @author Stefan Gehrer <stefan.gehrer@gmx.de>
*/
#include "libavutil/avassert.h"
#include "avcodec.h"
#include "get_bits.h"
#include "golomb.h"
#include "cavs.h"
#include "internal.h"
#include "mpeg12data.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];
}
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->ref];
int m = FF_SIGNBIT(col_mv->x);
pmv_fw->dist = h->dist[1];
pmv_bw->dist = h->dist[0];
pmv_fw->ref = 1;
pmv_bw->ref = 0;
/* scale the co-located motion vector according to its temporal span */
pmv_fw->x = (((den + (den * col_mv->x * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
pmv_bw->x = m - (((den + (den * col_mv->x * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
m = FF_SIGNBIT(col_mv->y);
pmv_fw->y = (((den + (den * col_mv->y * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
pmv_bw->y = m - (((den + (den * col_mv->y * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
}
static inline void mv_pred_sym(AVSContext *h, cavs_vector *src,
enum cavs_block size)
{
cavs_vector *dst = src + MV_BWD_OFFS;
/* backward mv is the scaled and negated forward mv */
dst->x = -((src->x * h->sym_factor + 256) >> 9);
dst->y = -((src->y * h->sym_factor + 256) >> 9);
dst->ref = 0;
dst->dist = h->dist[0];
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 larger\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.permutated;
/* 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;
}
if ((ret = dequant(h, level_buf, run_buf, block, dequant_mul[qp],
dequant_shift[qp], i)) < 0)
return ret;
h->cdsp.cavs_idct8_add(dst, block, stride);
h->bdsp.clear_block(block);
return 0;
}
static inline int decode_residual_chroma(AVSContext *h)
{
if (h->cbp & (1 << 4)) {
int ret = decode_residual_block(h, &h->gb, chroma_dec, 0,
ff_cavs_chroma_qp[h->qp], h->cu, h->c_stride);
if (ret < 0)
return ret;
}
if (h->cbp & (1 << 5)) {
int ret = decode_residual_block(h, &h->gb, chroma_dec, 0,
ff_cavs_chroma_qp[h->qp], h->cv, h->c_stride);
if (ret < 0)
return ret;
}
return 0;
}
static inline int decode_residual_inter(AVSContext *h)
{
int block;
/* 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];
/* get quantizer */
if (h->cbp && !h->qp_fixed)
h->qp = (h->qp + (unsigned)get_se_golomb(&h->gb)) & 63;
for (block = 0; block < 4; block++)
if (h->cbp & (1 << block))
decode_residual_block(h, &h->gb, inter_dec, 0, h->qp,
h->cy + h->luma_scan[block], h->l_stride);
decode_residual_chroma(h);
return 0;
}
/*****************************************************************************
*
* macroblock level
*
****************************************************************************/
static inline void set_mv_intra(AVSContext *h)
{
h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
h->mv[MV_BWD_X0] = ff_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);
/* 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 (!get_bits1(gb)) {
int rem_mode = get_bits(gb, 2);
predpred = rem_mode + (rem_mode >= predpred);
}
h->pred_mode_Y[pos] = predpred;
}
pred_mode_uv = get_ue_golomb(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->cur.f->pict_type == AV_PICTURE_TYPE_I)
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];
if (h->cbp && !h->qp_fixed)
h->qp = (h->qp + (unsigned)get_se_golomb(gb)) & 63; //qp_delta
/* 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_block(h, gb, intra_dec, 1, 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;
}
}
static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type)
{
GetBitContext *gb = &h->gb;
int ref[4];
ff_cavs_init_mb(h);
switch (mb_type) {
case P_SKIP:
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
break;
case P_16X16:
ref[0] = h->ref_flag ? 0 : get_bits1(gb);
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0]);
break;
case P_16X8:
ref[0] = h->ref_flag ? 0 : get_bits1(gb);
ref[2] = h->ref_flag ? 0 : get_bits1(gb);
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]);
ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]);
break;
case P_8X16:
ref[0] = h->ref_flag ? 0 : get_bits1(gb);
ref[1] = h->ref_flag ? 0 : get_bits1(gb);
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]);
ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);
break;
case P_8X8:
ref[0] = h->ref_flag ? 0 : get_bits1(gb);
ref[1] = h->ref_flag ? 0 : get_bits1(gb);
ref[2] = h->ref_flag ? 0 : get_bits1(gb);
ref[3] = h->ref_flag ? 0 : get_bits1(gb);
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]);
ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]);
ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]);
ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]);
}
ff_cavs_inter(h, mb_type);
set_intra_mode_default(h);
store_mvs(h);
if (mb_type != P_SKIP)
decode_residual_inter(h);
ff_cavs_filter(h, mb_type);
h->col_type_base[h->mbidx] = mb_type;
}
static int decode_mb_b(AVSContext *h, enum cavs_mb mb_type)
{
int block;
enum cavs_sub_mb sub_type[4];
int flags;
ff_cavs_init_mb(h);
/* reset all MVs */
h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
h->mv[MV_BWD_X0] = ff_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[h->mbidx]) {
/* intra MB at co-location, do in-plane prediction */
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
} 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[h->mbidx * 4 + block]);
break;
case B_FWD_16X16:
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
break;
case B_SYM_16X16:
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
break;
case B_BWD_16X16:
ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);
break;
case B_8X8:
#define TMP_UNUSED_INX 7
flags = 0;
for (block = 0; block < 4; block++)
sub_type[block] = get_bits(&h->gb, 2);
for (block = 0; block < 4; block++) {
switch (sub_type[block]) {
case B_SUB_DIRECT:
if (!h->col_type_base[h->mbidx]) {
/* 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, 1);
ff_cavs_mv(h, MV_FWD_X0+MV_BWD_OFFS,
MV_FWD_C2+MV_BWD_OFFS,
MV_PRED_BSKIP, BLK_8X8, 0);
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[h->mbidx * 4 + block]);
break;
case B_SUB_FWD:
ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
MV_PRED_MEDIAN, BLK_8X8, 1);
break;
case B_SUB_SYM:
ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
MV_PRED_MEDIAN, BLK_8X8, 1);
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)
ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
mv_scan[block] + MV_BWD_OFFS - 3,
MV_PRED_MEDIAN, BLK_8X8, 0);
}
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)
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1);
if (flags & SYM0)
mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
if (flags & FWD1)
ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
if (flags & SYM1)
mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
if (flags & BWD0)
ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0);
if (flags & BWD1)
ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
} else { /* 8x16 macroblock types */
if (flags & FWD0)
ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
if (flags & SYM0)
mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
if (flags & FWD1)
ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 1);
if (flags & SYM1)
mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
if (flags & BWD0)
ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
if (flags & BWD1)
ff_cavs_mv(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 0);
}
}
ff_cavs_inter(h, mb_type);
set_intra_mode_default(h);
if (mb_type != B_SKIP)
decode_residual_inter(h);
ff_cavs_filter(h, mb_type);
return 0;
}
/*****************************************************************************
*
* slice level
*
****************************************************************************/
static inline int decode_slice_header(AVSContext *h, GetBitContext *gb)
{
if (h->stc > 0xAF)
av_log(h->avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
if (h->stc >= h->mb_height) {
av_log(h->avctx, AV_LOG_ERROR, "stc 0x%02x is too large\n", h->stc);
return AVERROR_INVALIDDATA;
}
h->mby = h->stc;
h->mbidx = h->mby * h->mb_width;
/* 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->mby >= h->mb_width / 2))
if (get_bits1(gb)) { //slice_weighting_flag
av_log(h->avctx, AV_LOG_ERROR,
"weighted prediction not yet supported\n");
}
return 0;
}
static inline int check_for_slice(AVSContext *h)
{
GetBitContext *gb = &h->gb;
int align;
if (h->mbx)
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) {
skip_bits_long(gb, 24 + align);
h->stc = get_bits(gb, 8);
if (h->stc >= h->mb_height)
return 0;
decode_slice_header(h, gb);
return 1;
}
return 0;
}
/*****************************************************************************
*
* frame level
*
****************************************************************************/
static int decode_pic(AVSContext *h)
{
int ret;
int skip_count = -1;
enum cavs_mb mb_type;
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_dwlay
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
/* old sample clips were all progressive and no low_delay,
bump stream revision if detected otherwise */
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
}
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);
}
if ((ret = ff_cavs_init_pic(h)) < 0)
return ret;
h->cur.poc = get_bits(&h->gb, 8) * 2;
/* get temporal distances and MV scaling factors */
if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
h->dist[0] = (h->cur.poc - h->DPB[0].poc) & 511;
} else {
h->dist[0] = (h->DPB[0].poc - h->cur.poc) & 511;
}
h->dist[1] = (h->cur.poc - h->DPB[1].poc) & 511;
h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
if (h->cur.f->pict_type == AV_PICTURE_TYPE_B) {
h->sym_factor = h->dist[0] * h->scale_den[1];
if (FFABS(h->sym_factor) > 32768) {
av_log(h->avctx, AV_LOG_ERROR, "sym_factor %d too large\n", h->sym_factor);
return AVERROR_INVALIDDATA;
}
} else {
h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;
h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;
}
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);
if (!h->pic_structure && h->stc == PIC_PB_START_CODE)
skip_bits1(&h->gb); //advanced_pred_mode_disable
skip_bits1(&h->gb); //top_field_first
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) {
if (!h->progressive && !h->pic_structure)
skip_bits1(&h->gb);//what is this?
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);
skip_bits(&h->gb, 4); //reserved bits
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;
}
ret = 0;
if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
do {
check_for_slice(h);
ret = decode_mb_i(h, 0);
if (ret < 0)
break;
} while (ff_cavs_next_mb(h));
} else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {
do {
if (check_for_slice(h))
skip_count = -1;
if (h->skip_mode_flag && (skip_count < 0)) {
if (get_bits_left(&h->gb) < 1) {
ret = AVERROR_INVALIDDATA;
break;
}
skip_count = get_ue_golomb(&h->gb);
}
if (h->skip_mode_flag && skip_count--) {
decode_mb_p(h, P_SKIP);
} else {
if (get_bits_left(&h->gb) < 1) {
ret = AVERROR_INVALIDDATA;
break;
}
mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;
if (mb_type > P_8X8)
ret = decode_mb_i(h, mb_type - P_8X8 - 1);
else
decode_mb_p(h, mb_type);
}
if (ret < 0)
break;
} while (ff_cavs_next_mb(h));
} else { /* AV_PICTURE_TYPE_B */
do {
if (check_for_slice(h))
skip_count = -1;
if (h->skip_mode_flag && (skip_count < 0)) {
if (get_bits_left(&h->gb) < 1) {
ret = AVERROR_INVALIDDATA;
break;
}
skip_count = get_ue_golomb(&h->gb);
}
if (h->skip_mode_flag && skip_count--) {
ret = decode_mb_b(h, B_SKIP);
} else {
if (get_bits_left(&h->gb) < 1) {
ret = AVERROR_INVALIDDATA;
break;
}
mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;
if (mb_type > B_8X8)
ret = decode_mb_i(h, mb_type - B_8X8 - 1);
else
ret = decode_mb_b(h, mb_type);
}
if (ret < 0)
break;
} while (ff_cavs_next_mb(h));
}
emms_c();
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 width, height;
int ret;
h->profile = get_bits(&h->gb, 8);
h->level = get_bits(&h->gb, 8);
skip_bits1(&h->gb); //progressive sequence
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;
}
skip_bits(&h->gb, 2); //chroma format
skip_bits(&h->gb, 3); //sample_precision
h->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
h->low_delay = get_bits1(&h->gb);
ret = ff_set_dimensions(h->avctx, width, height);
if (ret < 0)
return ret;
h->width = width;
h->height = height;
h->mb_width = (h->width + 15) >> 4;
h->mb_height = (h->height + 15) >> 4;
h->avctx->framerate = ff_mpeg12_frame_rate_tab[frame_rate_code];
if (!h->top_qp)
return ff_cavs_init_top_lines(h);
return 0;
}
static void cavs_flush(AVCodecContext * avctx)
{
AVSContext *h = avctx->priv_data;
h->got_keyframe = 0;
}
static int cavs_decode_frame(AVCodecContext *avctx, void *data, 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(data, 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) * 8;
switch (stc) {
case CAVS_START_CODE:
init_get_bits(&h->gb, buf_ptr, input_size);
decode_seq_header(h);
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;
}
case PIC_PB_START_CODE:
if (frame_start > 1)
return AVERROR_INVALIDDATA;
frame_start ++;
if (*got_frame)
av_frame_unref(data);
*got_frame = 0;
if (!h->got_keyframe)
break;
init_get_bits(&h->gb, buf_ptr, input_size);
h->stc = stc;
if (decode_pic(h))
break;
*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(data, h->DPB[!h->low_delay].f)) < 0)
return ret;
} else {
*got_frame = 0;
}
} else {
av_frame_move_ref(data, 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:
if (stc <= SLICE_MAX_START_CODE) {
init_get_bits(&h->gb, buf_ptr, input_size);
decode_slice_header(h, &h->gb);
}
break;
}
}
}
AVCodec ff_cavs_decoder = {
.name = "cavs",
.long_name = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_CAVS,
.priv_data_size = sizeof(AVSContext),
.init = ff_cavs_init,
.close = ff_cavs_end,
.decode = cavs_decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
.flush = cavs_flush,
};