cavsdec.c 53.8 KB
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/*
 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
 * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>
 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * 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.
 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
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 * @file
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 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder
 * @author Stefan Gehrer <stefan.gehrer@gmx.de>
 */

#include "avcodec.h"
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#include "get_bits.h"
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#include "golomb.h"
#include "cavs.h"
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#include "internal.h"
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#include "mpeg12data.h"
#include "mpegvideo.h"
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static const uint8_t mv_scan[4] = {
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    MV_FWD_X0, MV_FWD_X1,
    MV_FWD_X2, MV_FWD_X3
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};

static const uint8_t cbp_tab[64][2] = {
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  { 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 }
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};

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static const uint8_t scan3x3[4] = { 4, 5, 7, 8 };

static const uint8_t cavs_chroma_qp[64] = {
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   0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
  16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
  32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 43, 44, 44,
  45, 45, 46, 46, 47, 47, 48, 48, 48, 49, 49, 49, 50, 50, 50, 51
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};

static const uint8_t dequant_shift[64] = {
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  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
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};

static const uint16_t dequant_mul[64] = {
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  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
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};

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#define EOB 0, 0, 0
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static const struct dec_2dvlc intra_dec[7] = {
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    {
        { //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
104
    },
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    {
        { //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
123
    },
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    {
        { //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
142
    },
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    {
        { //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
161
    },
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    {
        { //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
180
    },
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    {
        { //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
199
    },
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    {
        { //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
    }
219 220 221
};

static const struct dec_2dvlc inter_dec[7] = {
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    {
        { //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
240
    },
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    {
        { //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
259
    },
260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277
    {
        { //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
278
    },
279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296
    {
        { //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
297
    },
298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315
    {
        { //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
316
    },
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334
    {
        { //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
335
    },
336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354
    {
        { //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
    }
355 356 357
};

static const struct dec_2dvlc chroma_dec[5] = {
358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375
    {
        { //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
376
    },
377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394
    {
        { //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
395
    },
396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413
    {
        { //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
414
    },
415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432
    {
        { //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
433
    },
434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452
    {
        { //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
    }
453 454 455 456
};

#undef EOB

457 458 459 460 461 462
/*****************************************************************************
 *
 * motion vector prediction
 *
 ****************************************************************************/

463 464 465 466 467 468
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];
469 470
}

471
static inline void mv_pred_direct(AVSContext *h, cavs_vector *pmv_fw,
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                                  cavs_vector *col_mv)
{
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    cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;
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    int den = h->direct_den[col_mv->ref];
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    int m = FF_SIGNBIT(col_mv->x);
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    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 */
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    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);
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    m = FF_SIGNBIT(col_mv->y);
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    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);
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}

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static inline void mv_pred_sym(AVSContext *h, cavs_vector *src,
                               enum cavs_block size)
{
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    cavs_vector *dst = src + MV_BWD_OFFS;
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    /* 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 */
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static inline int get_ue_code(GetBitContext *gb, int order)
{
    if (order) {
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        int ret = get_ue_golomb(gb) << order;
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        return ret + get_bits(gb, order);
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    }
    return get_ue_golomb(gb);
}

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static inline int dequant(AVSContext *h, int16_t *level_buf, uint8_t *run_buf,
                          int16_t *dst, int mul, int shift, int coeff_num)
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{
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    int round = 1 << (shift - 1);
    int pos = -1;
    const uint8_t *scantab = h->scantable.permutated;

    /* inverse scan and dequantization */
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    while (--coeff_num >= 0) {
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        pos += run_buf[coeff_num];
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        if (pos > 63) {
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            av_log(h->avctx, AV_LOG_ERROR,
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                   "position out of block bounds at pic %d MB(%d,%d)\n",
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                   h->cur.poc, h->mbx, h->mby);
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            return AVERROR_INVALIDDATA;
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        }
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        dst[scantab[pos]] = (level_buf[coeff_num] * mul + round) >> shift;
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    }
    return 0;
}

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/**
 * 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,
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                                 const struct dec_2dvlc *r, int esc_golomb_order,
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                                 int qp, uint8_t *dst, int stride)
{
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    int i, level_code, esc_code, level, run, mask, ret;
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    int16_t level_buf[65];
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    uint8_t run_buf[65];
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    int16_t *block = h->block;
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    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;
            esc_code = get_ue_code(gb, esc_golomb_order);
            level    = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
            while (level > r->inc_limit)
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                r++;
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            mask  = -(level_code & 1);
            level = (level ^ mask) - mask;
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        } else if (level_code >= 0) {
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            level = r->rltab[level_code][0];
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            if (!level) //end of block signal
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                break;
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            run = r->rltab[level_code][1];
            r  += r->rltab[level_code][2];
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        } else {
            break;
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        }
        level_buf[i] = level;
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        run_buf[i]   = run;
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    }
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    if ((ret = dequant(h, level_buf, run_buf, block, dequant_mul[qp],
                      dequant_shift[qp], i)) < 0)
        return ret;
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    h->cdsp.cavs_idct8_add(dst, block, stride);
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    h->bdsp.clear_block(block);
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    return 0;
}


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static inline void decode_residual_chroma(AVSContext *h)
{
    if (h->cbp & (1 << 4))
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        decode_residual_block(h, &h->gb, chroma_dec, 0,
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                              cavs_chroma_qp[h->qp], h->cu, h->c_stride);
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    if (h->cbp & (1 << 5))
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        decode_residual_block(h, &h->gb, chroma_dec, 0,
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                              cavs_chroma_qp[h->qp], h->cv, h->c_stride);
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}

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static inline int decode_residual_inter(AVSContext *h)
{
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    int block;

    /* get coded block pattern */
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    int cbp = get_ue_golomb(&h->gb);
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    if (cbp > 63 || cbp < 0) {
        av_log(h->avctx, AV_LOG_ERROR, "illegal inter cbp %d\n", cbp);
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        return AVERROR_INVALIDDATA;
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    }
    h->cbp = cbp_tab[cbp][1];

    /* get quantizer */
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    if (h->cbp && !h->qp_fixed)
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        h->qp = (h->qp + get_se_golomb(&h->gb)) & 63;
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    for (block = 0; block < 4; block++)
        if (h->cbp & (1 << block))
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            decode_residual_block(h, &h->gb, inter_dec, 0, h->qp,
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                                  h->cy + h->luma_scan[block], h->l_stride);
    decode_residual_chroma(h);

    return 0;
}

/*****************************************************************************
 *
 * macroblock level
 *
 ****************************************************************************/

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static inline void set_mv_intra(AVSContext *h)
{
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    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);
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    if (h->cur.f->pict_type != AV_PICTURE_TYPE_B)
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        h->col_type_base[h->mbidx] = I_8X8;
}

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static int decode_mb_i(AVSContext *h, int cbp_code)
{
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    GetBitContext *gb = &h->gb;
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    unsigned pred_mode_uv;
    int block;
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    uint8_t top[18];
    uint8_t *left = NULL;
    uint8_t *d;

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    ff_cavs_init_mb(h);
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    /* get intra prediction modes from stream */
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    for (block = 0; block < 4; block++) {
        int nA, nB, predpred;
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        int pos = scan3x3[block];
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        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
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            predpred = INTRA_L_LP;
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        if (!get_bits1(gb)) {
            int rem_mode = get_bits(gb, 2);
            predpred     = rem_mode + (rem_mode >= predpred);
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        }
        h->pred_mode_Y[pos] = predpred;
    }
    pred_mode_uv = get_ue_golomb(gb);
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    if (pred_mode_uv > 6) {
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        av_log(h->avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
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        return AVERROR_INVALIDDATA;
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    }
671
    ff_cavs_modify_mb_i(h, &pred_mode_uv);
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    /* get coded block pattern */
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    if (h->cur.f->pict_type == AV_PICTURE_TYPE_I)
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        cbp_code = get_ue_golomb(gb);
676
    if (cbp_code > 63 || cbp_code < 0) {
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        av_log(h->avctx, AV_LOG_ERROR, "illegal intra cbp\n");
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        return AVERROR_INVALIDDATA;
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    }
    h->cbp = cbp_tab[cbp_code][0];
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    if (h->cbp && !h->qp_fixed)
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        h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta

    /* luma intra prediction interleaved with residual decode/transform/add */
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    for (block = 0; block < 4; block++) {
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        d = h->cy + h->luma_scan[block];
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        ff_cavs_load_intra_pred_luma(h, top, &left, block);
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        h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]
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            (d, top, left, h->l_stride);
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        if (h->cbp & (1<<block))
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            decode_residual_block(h, gb, intra_dec, 1, h->qp, d, h->l_stride);
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    }

    /* chroma intra prediction */
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    ff_cavs_load_intra_pred_chroma(h);
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    h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx * 10],
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                                  h->left_border_u, h->c_stride);
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    h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx * 10],
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                                  h->left_border_v, h->c_stride);

    decode_residual_chroma(h);
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    ff_cavs_filter(h, I_8X8);
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    set_mv_intra(h);
    return 0;
}

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static inline void set_intra_mode_default(AVSContext *h)
{
    if (h->stream_revision > 0) {
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        h->pred_mode_Y[3] =  h->pred_mode_Y[6] = NOT_AVAIL;
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        h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = NOT_AVAIL;
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    } else {
        h->pred_mode_Y[3] =  h->pred_mode_Y[6] = INTRA_L_LP;
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        h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = INTRA_L_LP;
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    }
}

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static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type)
{
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    GetBitContext *gb = &h->gb;
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    int ref[4];

723
    ff_cavs_init_mb(h);
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    switch (mb_type) {
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    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);
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        ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0]);
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        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);
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        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]);
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        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);
757
    if (mb_type != P_SKIP)
758
        decode_residual_inter(h);
759
    ff_cavs_filter(h, mb_type);
760
    h->col_type_base[h->mbidx] = mb_type;
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}

763 764
static void decode_mb_b(AVSContext *h, enum cavs_mb mb_type)
{
765
    int block;
766
    enum cavs_sub_mb sub_type[4];
767 768
    int flags;

769
    ff_cavs_init_mb(h);
770 771 772 773 774 775

    /* 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);
776
    switch (mb_type) {
777 778
    case B_SKIP:
    case B_DIRECT:
779
        if (!h->col_type_base[h->mbidx]) {
780 781 782 783 784
            /* 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 */
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            for (block = 0; block < 4; block++)
                mv_pred_direct(h, &h->mv[mv_scan[block]],
                               &h->col_mv[h->mbidx * 4 + block]);
788 789 790 791 792 793 794 795 796 797 798 799
        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:
800
        for (block = 0; block < 4; block++)
801
            sub_type[block] = get_bits(&h->gb, 2);
802 803
        for (block = 0; block < 4; block++) {
            switch (sub_type[block]) {
804
            case B_SUB_DIRECT:
805
                if (!h->col_type_base[h->mbidx]) {
806
                    /* intra MB at co-location, do in-plane prediction */
807 808 809 810 811
                    ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
                               MV_PRED_BSKIP, BLK_8X8, 1);
                    ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
                               mv_scan[block] - 3 + MV_BWD_OFFS,
                               MV_PRED_BSKIP, BLK_8X8, 0);
812
                } else
813 814
                    mv_pred_direct(h, &h->mv[mv_scan[block]],
                                   &h->col_mv[h->mbidx * 4 + block]);
815 816
                break;
            case B_SUB_FWD:
817 818
                ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
                           MV_PRED_MEDIAN, BLK_8X8, 1);
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                break;
            case B_SUB_SYM:
821 822
                ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
                           MV_PRED_MEDIAN, BLK_8X8, 1);
823 824 825 826
                mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
                break;
            }
        }
827 828 829 830 831
        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);
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        }
        break;
    default:
        assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));
        flags = ff_cavs_partition_flags[mb_type];
837 838
        if (mb_type & 1) { /* 16x8 macroblock types */
            if (flags & FWD0)
839
                ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);
840
            if (flags & SYM0)
841
                mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
842
            if (flags & FWD1)
843
                ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
844
            if (flags & SYM1)
845
                mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
846
            if (flags & BWD0)
847
                ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);
848
            if (flags & BWD1)
849 850
                ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
        } else {          /* 8x16 macroblock types */
851
            if (flags & FWD0)
852
                ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
853
            if (flags & SYM0)
854
                mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
855 856 857
            if (flags & FWD1)
                ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 1);
            if (flags & SYM1)
858
                mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
859
            if (flags & BWD0)
860
                ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
861 862
            if (flags & BWD1)
                ff_cavs_mv(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 0);
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        }
    }
    ff_cavs_inter(h, mb_type);
    set_intra_mode_default(h);
867
    if (mb_type != B_SKIP)
868
        decode_residual_inter(h);
869
    ff_cavs_filter(h, mb_type);
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}

/*****************************************************************************
 *
 * slice level
 *
 ****************************************************************************/

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static inline int decode_slice_header(AVSContext *h, GetBitContext *gb)
{
    if (h->stc > 0xAF)
881
        av_log(h->avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
882 883
    h->mby   = h->stc;
    h->mbidx = h->mby * h->mb_width;
884 885

    /* mark top macroblocks as unavailable */
886 887
    h->flags &= ~(B_AVAIL | C_AVAIL);
    if ((h->mby == 0) && (!h->qp_fixed)) {
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        h->qp_fixed = get_bits1(gb);
889
        h->qp       = get_bits(gb, 6);
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    }
    /* inter frame or second slice can have weighting params */
892
    if ((h->cur.f->pict_type != AV_PICTURE_TYPE_I) ||
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        (!h->pic_structure && h->mby >= h->mb_width / 2))
        if (get_bits1(gb)) { //slice_weighting_flag
895
            av_log(h->avctx, AV_LOG_ERROR,
896 897 898 899 900
                   "weighted prediction not yet supported\n");
        }
    return 0;
}

901 902
static inline int check_for_slice(AVSContext *h)
{
903
    GetBitContext *gb = &h->gb;
904
    int align;
905

906
    if (h->mbx)
907
        return 0;
908
    align = (-get_bits_count(gb)) & 7;
909
    /* check for stuffing byte */
910
    if (!align && (show_bits(gb, 8) == 0x80))
911
        align = 8;
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    if ((show_bits_long(gb, 24 + align) & 0xFFFFFF) == 0x000001) {
        skip_bits_long(gb, 24 + align);
        h->stc = get_bits(gb, 8);
915 916
        if (h->stc >= h->mb_height)
            return 0;
917
        decode_slice_header(h, gb);
918
        return 1;
919
    }
920
    return 0;
921 922 923 924 925 926 927 928
}

/*****************************************************************************
 *
 * frame level
 *
 ****************************************************************************/

929 930
static int decode_pic(AVSContext *h)
{
931
    int ret;
932
    int skip_count    = -1;
933
    enum cavs_mb mb_type;
934

935 936 937 938 939
    if (!h->top_qp) {
        av_log(h->avctx, AV_LOG_ERROR, "No sequence header decoded yet\n");
        return AVERROR_INVALIDDATA;
    }

940 941
    av_frame_unref(h->cur.f);

942
    skip_bits(&h->gb, 16);//bbv_dwlay
943
    if (h->stc == PIC_PB_START_CODE) {
944 945
        h->cur.f->pict_type = get_bits(&h->gb, 2) + AV_PICTURE_TYPE_I;
        if (h->cur.f->pict_type > AV_PICTURE_TYPE_B) {
946
            av_log(h->avctx, AV_LOG_ERROR, "illegal picture type\n");
947
            return AVERROR_INVALIDDATA;
948 949
        }
        /* make sure we have the reference frames we need */
950
        if (!h->DPB[0].f->data[0] ||
951
           (!h->DPB[1].f->data[0] && h->cur.f->pict_type == AV_PICTURE_TYPE_B))
952
            return AVERROR_INVALIDDATA;
953
    } else {
954
        h->cur.f->pict_type = AV_PICTURE_TYPE_I;
955 956
        if (get_bits1(&h->gb))
            skip_bits(&h->gb, 24);//time_code
957 958
        /* old sample clips were all progressive and no low_delay,
           bump stream revision if detected otherwise */
959
        if (h->low_delay || !(show_bits(&h->gb, 9) & 1))
960 961
            h->stream_revision = 1;
        /* similarly test top_field_first and repeat_first_field */
962
        else if (show_bits(&h->gb, 11) & 3)
963
            h->stream_revision = 1;
964
        if (h->stream_revision > 0)
965
            skip_bits(&h->gb, 1); //marker_bit
966
    }
967

968 969 970 971
    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;
972 973 974 975 976 977 978

    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);
    }
979 980

    ff_cavs_init_pic(h);
981
    h->cur.poc = get_bits(&h->gb, 8) * 2;
982 983

    /* get temporal distances and MV scaling factors */
984
    if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
985
        h->dist[0] = (h->cur.poc - h->DPB[0].poc  + 512) % 512;
986
    } else {
987
        h->dist[0] = (h->DPB[0].poc  - h->cur.poc + 512) % 512;
988
    }
989
    h->dist[1] = (h->cur.poc - h->DPB[1].poc  + 512) % 512;
990 991
    h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
    h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
992
    if (h->cur.f->pict_type == AV_PICTURE_TYPE_B) {
993
        h->sym_factor = h->dist[0] * h->scale_den[1];
994
    } else {
995 996
        h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;
        h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;
997 998
    }

999 1000 1001
    if (h->low_delay)
        get_ue_golomb(&h->gb); //bbv_check_times
    h->progressive   = get_bits1(&h->gb);
1002
    h->pic_structure = 1;
1003
    if (!h->progressive)
1004
        h->pic_structure = get_bits1(&h->gb);
1005
    if (!h->pic_structure && h->stc == PIC_PB_START_CODE)
1006 1007 1008 1009 1010
        skip_bits1(&h->gb);     //advanced_pred_mode_disable
    skip_bits1(&h->gb);        //top_field_first
    skip_bits1(&h->gb);        //repeat_first_field
    h->qp_fixed = get_bits1(&h->gb);
    h->qp       = get_bits(&h->gb, 6);
1011
    if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
1012
        if (!h->progressive && !h->pic_structure)
1013 1014
            skip_bits1(&h->gb);//what is this?
        skip_bits(&h->gb, 4);   //reserved bits
1015
    } else {
1016
        if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))
1017 1018 1019
            h->ref_flag        = get_bits1(&h->gb);
        skip_bits(&h->gb, 4);   //reserved bits
        h->skip_mode_flag      = get_bits1(&h->gb);
1020
    }
1021 1022 1023 1024
    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);
1025 1026 1027
    } else {
        h->alpha_offset = h->beta_offset  = 0;
    }
1028
    if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
1029
        do {
1030
            check_for_slice(h);
1031
            decode_mb_i(h, 0);
1032
        } while (ff_cavs_next_mb(h));
1033
    } else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {
1034
        do {
1035
            if (check_for_slice(h))
1036
                skip_count = -1;
1037
            if (h->skip_mode_flag && (skip_count < 0))
1038
                skip_count = get_ue_golomb(&h->gb);
1039 1040
            if (h->skip_mode_flag && skip_count--) {
                decode_mb_p(h, P_SKIP);
1041
            } else {
1042
                mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;
1043
                if (mb_type > P_8X8)
1044 1045
                    decode_mb_i(h, mb_type - P_8X8 - 1);
                else
1046
                    decode_mb_p(h, mb_type);
1047
            }
1048
        } while (ff_cavs_next_mb(h));
1049
    } else { /* AV_PICTURE_TYPE_B */
1050
        do {
1051
            if (check_for_slice(h))
1052
                skip_count = -1;
1053
            if (h->skip_mode_flag && (skip_count < 0))
1054
                skip_count = get_ue_golomb(&h->gb);
1055 1056
            if (h->skip_mode_flag && skip_count--) {
                decode_mb_b(h, B_SKIP);
1057
            } else {
1058
                mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;
1059
                if (mb_type > B_8X8)
1060 1061
                    decode_mb_i(h, mb_type - B_8X8 - 1);
                else
1062
                    decode_mb_b(h, mb_type);
1063
            }
1064
        } while (ff_cavs_next_mb(h));
1065
    }
1066
    if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1067
        av_frame_unref(h->DPB[1].f);
1068 1069
        FFSWAP(AVSFrame, h->cur, h->DPB[1]);
        FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
    }
    return 0;
}

/*****************************************************************************
 *
 * headers and interface
 *
 ****************************************************************************/

1080 1081
static int decode_seq_header(AVSContext *h)
{
1082
    int frame_rate_code;
1083
    int width, height;
1084

1085 1086 1087
    h->profile = get_bits(&h->gb, 8);
    h->level   = get_bits(&h->gb, 8);
    skip_bits1(&h->gb); //progressive sequence
1088

1089 1090 1091
    width  = get_bits(&h->gb, 14);
    height = get_bits(&h->gb, 14);
    if ((h->width || h->height) && (h->width != width || h->height != height)) {
1092 1093
        avpriv_report_missing_feature(h->avctx,
                                      "Width/height changing in CAVS");
1094 1095
        return AVERROR_PATCHWELCOME;
    }
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
    h->width  = width;
    h->height = height;

    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);
    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);
    h->mb_width  = (h->width  + 15) >> 4;
    h->mb_height = (h->height + 15) >> 4;
1109
    h->avctx->framerate = ff_mpeg12_frame_rate_tab[frame_rate_code];
1110 1111
    h->avctx->width  = h->width;
    h->avctx->height = h->height;
1112
    if (!h->top_qp)
1113 1114 1115 1116
        ff_cavs_init_top_lines(h);
    return 0;
}

1117 1118
static void cavs_flush(AVCodecContext * avctx)
{
1119 1120 1121 1122
    AVSContext *h = avctx->priv_data;
    h->got_keyframe = 0;
}

1123
static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1124 1125 1126
                             AVPacket *avpkt)
{
    AVSContext *h      = avctx->priv_data;
1127
    const uint8_t *buf = avpkt->data;
1128 1129
    int buf_size       = avpkt->size;
    uint32_t stc       = -1;
1130
    int input_size, ret;
1131 1132 1133 1134
    const uint8_t *buf_end;
    const uint8_t *buf_ptr;

    if (buf_size == 0) {
1135
        if (!h->low_delay && h->DPB[0].f->data[0]) {
1136
            *got_frame = 1;
1137
            av_frame_move_ref(data, h->DPB[0].f);
1138 1139 1140 1141 1142 1143 1144
        }
        return 0;
    }

    buf_ptr = buf;
    buf_end = buf + buf_size;
    for(;;) {
1145
        buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &stc);
1146
        if ((stc & 0xFFFFFE00) || buf_ptr == buf_end)
1147
            return FFMAX(0, buf_ptr - buf);
1148 1149
        input_size = (buf_end - buf_ptr) * 8;
        switch (stc) {
1150
        case CAVS_START_CODE:
1151
            init_get_bits(&h->gb, buf_ptr, input_size);
1152 1153 1154
            decode_seq_header(h);
            break;
        case PIC_I_START_CODE:
1155
            if (!h->got_keyframe) {
1156 1157
                av_frame_unref(h->DPB[0].f);
                av_frame_unref(h->DPB[1].f);
1158 1159 1160
                h->got_keyframe = 1;
            }
        case PIC_PB_START_CODE:
1161
            *got_frame = 0;
1162
            if (!h->got_keyframe)
1163
                break;
1164
            init_get_bits(&h->gb, buf_ptr, input_size);
1165
            h->stc = stc;
1166
            if (decode_pic(h))
1167
                break;
1168
            *got_frame = 1;
1169
            if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1170
                if (h->DPB[1].f->data[0]) {
1171 1172
                    if ((ret = av_frame_ref(data, h->DPB[1].f)) < 0)
                        return ret;
1173
                } else {
1174
                    *got_frame = 0;
1175
                }
1176 1177 1178
            } else {
                av_frame_move_ref(data, h->cur.f);
            }
1179 1180
            break;
        case EXT_START_CODE:
1181
            //mpeg_decode_extension(avctx, buf_ptr, input_size);
1182 1183
            break;
        case USER_START_CODE:
1184
            //mpeg_decode_user_data(avctx, buf_ptr, input_size);
1185 1186
            break;
        default:
1187
            if (stc <= SLICE_MAX_START_CODE) {
1188 1189
                init_get_bits(&h->gb, buf_ptr, input_size);
                decode_slice_header(h, &h->gb);
1190 1191 1192 1193 1194 1195
            }
            break;
        }
    }
}

1196
AVCodec ff_cavs_decoder = {
1197
    .name           = "cavs",
1198
    .long_name      = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
1199
    .type           = AVMEDIA_TYPE_VIDEO,
1200
    .id             = AV_CODEC_ID_CAVS,
1201 1202 1203 1204 1205
    .priv_data_size = sizeof(AVSContext),
    .init           = ff_cavs_init,
    .close          = ff_cavs_end,
    .decode         = cavs_decode_frame,
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,
1206
    .flush          = cavs_flush,
1207
};