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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * 4XM codec |
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| 3 | * Copyright (c) 2003 Michael Niedermayer |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * 4XM codec. |
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| 25 | */ |
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| 26 | |||
| 27 | #include "libavutil/avassert.h" |
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| 28 | #include "libavutil/frame.h" |
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| 29 | #include "libavutil/intreadwrite.h" |
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| 30 | #include "avcodec.h" |
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| 31 | #include "bytestream.h" |
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| 32 | #include "dsputil.h" |
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| 33 | #include "get_bits.h" |
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| 34 | #include "internal.h" |
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| 35 | |||
| 36 | |||
| 37 | #define BLOCK_TYPE_VLC_BITS 5 |
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| 38 | #define ACDC_VLC_BITS 9 |
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| 39 | |||
| 40 | #define CFRAME_BUFFER_COUNT 100 |
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| 41 | |||
| 42 | static const uint8_t block_type_tab[2][4][8][2] = { |
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| 43 | { |
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| 44 | { // { 8, 4, 2 } x { 8, 4, 2} |
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| 45 | { 0, 1 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 30, 5 }, { 31, 5 }, { 0, 0 } |
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| 46 | }, { // { 8, 4 } x 1 |
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| 47 | { 0, 1 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 } |
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| 48 | }, { // 1 x { 8, 4 } |
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| 49 | { 0, 1 }, { 2, 2 }, { 0, 0 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 } |
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| 50 | }, { // 1 x 2, 2 x 1 |
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| 51 | { 0, 1 }, { 0, 0 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 } |
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| 52 | } |
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| 53 | }, { |
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| 54 | { // { 8, 4, 2 } x { 8, 4, 2} |
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| 55 | { 1, 2 }, { 4, 3 }, { 5, 3 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } |
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| 56 | }, {// { 8, 4 } x 1 |
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| 57 | { 1, 2 }, { 0, 0 }, { 2, 2 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } |
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| 58 | }, {// 1 x { 8, 4 } |
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| 59 | { 1, 2 }, { 2, 2 }, { 0, 0 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } |
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| 60 | }, {// 1 x 2, 2 x 1 |
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| 61 | { 1, 2 }, { 0, 0 }, { 0, 0 }, { 0, 2 }, { 2, 2 }, { 6, 3 }, { 7, 3 } |
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| 62 | } |
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| 63 | } |
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| 64 | }; |
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| 65 | |||
| 66 | static const uint8_t size2index[4][4] = { |
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| 67 | { -1, 3, 1, 1 }, |
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| 68 | { 3, 0, 0, 0 }, |
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| 69 | { 2, 0, 0, 0 }, |
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| 70 | { 2, 0, 0, 0 }, |
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| 71 | }; |
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| 72 | |||
| 73 | static const int8_t mv[256][2] = { |
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| 74 | { 0, 0 }, { 0, -1 }, { -1, 0 }, { 1, 0 }, { 0, 1 }, { -1, -1 }, { 1, -1 }, { -1, 1 }, |
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| 75 | { 1, 1 }, { 0, -2 }, { -2, 0 }, { 2, 0 }, { 0, 2 }, { -1, -2 }, { 1, -2 }, { -2, -1 }, |
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| 76 | { 2, -1 }, { -2, 1 }, { 2, 1 }, { -1, 2 }, { 1, 2 }, { -2, -2 }, { 2, -2 }, { -2, 2 }, |
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| 77 | { 2, 2 }, { 0, -3 }, { -3, 0 }, { 3, 0 }, { 0, 3 }, { -1, -3 }, { 1, -3 }, { -3, -1 }, |
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| 78 | { 3, -1 }, { -3, 1 }, { 3, 1 }, { -1, 3 }, { 1, 3 }, { -2, -3 }, { 2, -3 }, { -3, -2 }, |
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| 79 | { 3, -2 }, { -3, 2 }, { 3, 2 }, { -2, 3 }, { 2, 3 }, { 0, -4 }, { -4, 0 }, { 4, 0 }, |
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| 80 | { 0, 4 }, { -1, -4 }, { 1, -4 }, { -4, -1 }, { 4, -1 }, { 4, 1 }, { -1, 4 }, { 1, 4 }, |
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| 81 | { -3, -3 }, { -3, 3 }, { 3, 3 }, { -2, -4 }, { -4, -2 }, { 4, -2 }, { -4, 2 }, { -2, 4 }, |
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| 82 | { 2, 4 }, { -3, -4 }, { 3, -4 }, { 4, -3 }, { -5, 0 }, { -4, 3 }, { -3, 4 }, { 3, 4 }, |
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| 83 | { -1, -5 }, { -5, -1 }, { -5, 1 }, { -1, 5 }, { -2, -5 }, { 2, -5 }, { 5, -2 }, { 5, 2 }, |
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| 84 | { -4, -4 }, { -4, 4 }, { -3, -5 }, { -5, -3 }, { -5, 3 }, { 3, 5 }, { -6, 0 }, { 0, 6 }, |
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| 85 | { -6, -1 }, { -6, 1 }, { 1, 6 }, { 2, -6 }, { -6, 2 }, { 2, 6 }, { -5, -4 }, { 5, 4 }, |
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| 86 | { 4, 5 }, { -6, -3 }, { 6, 3 }, { -7, 0 }, { -1, -7 }, { 5, -5 }, { -7, 1 }, { -1, 7 }, |
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| 87 | { 4, -6 }, { 6, 4 }, { -2, -7 }, { -7, 2 }, { -3, -7 }, { 7, -3 }, { 3, 7 }, { 6, -5 }, |
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| 88 | { 0, -8 }, { -1, -8 }, { -7, -4 }, { -8, 1 }, { 4, 7 }, { 2, -8 }, { -2, 8 }, { 6, 6 }, |
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| 89 | { -8, 3 }, { 5, -7 }, { -5, 7 }, { 8, -4 }, { 0, -9 }, { -9, -1 }, { 1, 9 }, { 7, -6 }, |
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| 90 | { -7, 6 }, { -5, -8 }, { -5, 8 }, { -9, 3 }, { 9, -4 }, { 7, -7 }, { 8, -6 }, { 6, 8 }, |
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| 91 | { 10, 1 }, { -10, 2 }, { 9, -5 }, { 10, -3 }, { -8, -7 }, { -10, -4 }, { 6, -9 }, { -11, 0 }, |
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| 92 | { 11, 1 }, { -11, -2 }, { -2, 11 }, { 7, -9 }, { -7, 9 }, { 10, 6 }, { -4, 11 }, { 8, -9 }, |
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| 93 | { 8, 9 }, { 5, 11 }, { 7, -10 }, { 12, -3 }, { 11, 6 }, { -9, -9 }, { 8, 10 }, { 5, 12 }, |
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| 94 | { -11, 7 }, { 13, 2 }, { 6, -12 }, { 10, 9 }, { -11, 8 }, { -7, 12 }, { 0, 14 }, { 14, -2 }, |
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| 95 | { -9, 11 }, { -6, 13 }, { -14, -4 }, { -5, -14 }, { 5, 14 }, { -15, -1 }, { -14, -6 }, { 3, -15 }, |
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| 96 | { 11, -11 }, { -7, 14 }, { -5, 15 }, { 8, -14 }, { 15, 6 }, { 3, 16 }, { 7, -15 }, { -16, 5 }, |
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| 97 | { 0, 17 }, { -16, -6 }, { -10, 14 }, { -16, 7 }, { 12, 13 }, { -16, 8 }, { -17, 6 }, { -18, 3 }, |
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| 98 | { -7, 17 }, { 15, 11 }, { 16, 10 }, { 2, -19 }, { 3, -19 }, { -11, -16 }, { -18, 8 }, { -19, -6 }, |
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| 99 | { 2, -20 }, { -17, -11 }, { -10, -18 }, { 8, 19 }, { -21, -1 }, { -20, 7 }, { -4, 21 }, { 21, 5 }, |
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| 100 | { 15, 16 }, { 2, -22 }, { -10, -20 }, { -22, 5 }, { 20, -11 }, { -7, -22 }, { -12, 20 }, { 23, -5 }, |
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| 101 | { 13, -20 }, { 24, -2 }, { -15, 19 }, { -11, 22 }, { 16, 19 }, { 23, -10 }, { -18, -18 }, { -9, -24 }, |
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| 102 | { 24, -10 }, { -3, 26 }, { -23, 13 }, { -18, -20 }, { 17, 21 }, { -4, 27 }, { 27, 6 }, { 1, -28 }, |
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| 103 | { -11, 26 }, { -17, -23 }, { 7, 28 }, { 11, -27 }, { 29, 5 }, { -23, -19 }, { -28, -11 }, { -21, 22 }, |
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| 104 | { -30, 7 }, { -17, 26 }, { -27, 16 }, { 13, 29 }, { 19, -26 }, { 10, -31 }, { -14, -30 }, { 20, -27 }, |
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| 105 | { -29, 18 }, { -16, -31 }, { -28, -22 }, { 21, -30 }, { -25, 28 }, { 26, -29 }, { 25, -32 }, { -32, -32 } |
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| 106 | }; |
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| 107 | |||
| 108 | /* This is simply the scaled down elementwise product of the standard JPEG |
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| 109 | * quantizer table and the AAN premul table. */ |
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| 110 | static const uint8_t dequant_table[64] = { |
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| 111 | 16, 15, 13, 19, 24, 31, 28, 17, |
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| 112 | 17, 23, 25, 31, 36, 63, 45, 21, |
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| 113 | 18, 24, 27, 37, 52, 59, 49, 20, |
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| 114 | 16, 28, 34, 40, 60, 80, 51, 20, |
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| 115 | 18, 31, 48, 66, 68, 86, 56, 21, |
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| 116 | 19, 38, 56, 59, 64, 64, 48, 20, |
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| 117 | 27, 48, 55, 55, 56, 51, 35, 15, |
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| 118 | 20, 35, 34, 32, 31, 22, 15, 8, |
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| 119 | }; |
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| 120 | |||
| 121 | static VLC block_type_vlc[2][4]; |
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| 122 | |||
| 123 | |||
| 124 | typedef struct CFrameBuffer { |
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| 125 | unsigned int allocated_size; |
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| 126 | unsigned int size; |
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| 127 | int id; |
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| 128 | uint8_t *data; |
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| 129 | } CFrameBuffer; |
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| 130 | |||
| 131 | typedef struct FourXContext { |
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| 132 | AVCodecContext *avctx; |
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| 133 | DSPContext dsp; |
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| 134 | AVFrame *current_picture, *last_picture; |
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| 135 | GetBitContext pre_gb; ///< ac/dc prefix |
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| 136 | GetBitContext gb; |
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| 137 | GetByteContext g; |
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| 138 | GetByteContext g2; |
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| 139 | int mv[256]; |
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| 140 | VLC pre_vlc; |
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| 141 | int last_dc; |
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| 142 | DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
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| 143 | void *bitstream_buffer; |
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| 144 | unsigned int bitstream_buffer_size; |
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| 145 | int version; |
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| 146 | CFrameBuffer cfrm[CFRAME_BUFFER_COUNT]; |
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| 147 | } FourXContext; |
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| 148 | |||
| 149 | |||
| 150 | #define FIX_1_082392200 70936 |
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| 151 | #define FIX_1_414213562 92682 |
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| 152 | #define FIX_1_847759065 121095 |
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| 153 | #define FIX_2_613125930 171254 |
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| 154 | |||
| 155 | #define MULTIPLY(var, const) (((var) * (const)) >> 16) |
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| 156 | |||
| 157 | static void idct(int16_t block[64]) |
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| 158 | { |
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| 159 | int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
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| 160 | int tmp10, tmp11, tmp12, tmp13; |
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| 161 | int z5, z10, z11, z12, z13; |
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| 162 | int i; |
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| 163 | int temp[64]; |
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| 164 | |||
| 165 | for (i = 0; i < 8; i++) { |
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| 166 | tmp10 = block[8 * 0 + i] + block[8 * 4 + i]; |
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| 167 | tmp11 = block[8 * 0 + i] - block[8 * 4 + i]; |
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| 168 | |||
| 169 | tmp13 = block[8 * 2 + i] + block[8 * 6 + i]; |
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| 170 | tmp12 = MULTIPLY(block[8 * 2 + i] - block[8 * 6 + i], FIX_1_414213562) - tmp13; |
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| 171 | |||
| 172 | tmp0 = tmp10 + tmp13; |
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| 173 | tmp3 = tmp10 - tmp13; |
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| 174 | tmp1 = tmp11 + tmp12; |
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| 175 | tmp2 = tmp11 - tmp12; |
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| 176 | |||
| 177 | z13 = block[8 * 5 + i] + block[8 * 3 + i]; |
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| 178 | z10 = block[8 * 5 + i] - block[8 * 3 + i]; |
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| 179 | z11 = block[8 * 1 + i] + block[8 * 7 + i]; |
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| 180 | z12 = block[8 * 1 + i] - block[8 * 7 + i]; |
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| 181 | |||
| 182 | tmp7 = z11 + z13; |
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| 183 | tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); |
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| 184 | |||
| 185 | z5 = MULTIPLY(z10 + z12, FIX_1_847759065); |
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| 186 | tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; |
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| 187 | tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5; |
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| 188 | |||
| 189 | tmp6 = tmp12 - tmp7; |
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| 190 | tmp5 = tmp11 - tmp6; |
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| 191 | tmp4 = tmp10 + tmp5; |
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| 192 | |||
| 193 | temp[8 * 0 + i] = tmp0 + tmp7; |
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| 194 | temp[8 * 7 + i] = tmp0 - tmp7; |
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| 195 | temp[8 * 1 + i] = tmp1 + tmp6; |
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| 196 | temp[8 * 6 + i] = tmp1 - tmp6; |
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| 197 | temp[8 * 2 + i] = tmp2 + tmp5; |
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| 198 | temp[8 * 5 + i] = tmp2 - tmp5; |
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| 199 | temp[8 * 4 + i] = tmp3 + tmp4; |
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| 200 | temp[8 * 3 + i] = tmp3 - tmp4; |
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| 201 | } |
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| 202 | |||
| 203 | for (i = 0; i < 8 * 8; i += 8) { |
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| 204 | tmp10 = temp[0 + i] + temp[4 + i]; |
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| 205 | tmp11 = temp[0 + i] - temp[4 + i]; |
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| 206 | |||
| 207 | tmp13 = temp[2 + i] + temp[6 + i]; |
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| 208 | tmp12 = MULTIPLY(temp[2 + i] - temp[6 + i], FIX_1_414213562) - tmp13; |
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| 209 | |||
| 210 | tmp0 = tmp10 + tmp13; |
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| 211 | tmp3 = tmp10 - tmp13; |
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| 212 | tmp1 = tmp11 + tmp12; |
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| 213 | tmp2 = tmp11 - tmp12; |
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| 214 | |||
| 215 | z13 = temp[5 + i] + temp[3 + i]; |
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| 216 | z10 = temp[5 + i] - temp[3 + i]; |
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| 217 | z11 = temp[1 + i] + temp[7 + i]; |
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| 218 | z12 = temp[1 + i] - temp[7 + i]; |
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| 219 | |||
| 220 | tmp7 = z11 + z13; |
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| 221 | tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); |
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| 222 | |||
| 223 | z5 = MULTIPLY(z10 + z12, FIX_1_847759065); |
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| 224 | tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; |
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| 225 | tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5; |
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| 226 | |||
| 227 | tmp6 = tmp12 - tmp7; |
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| 228 | tmp5 = tmp11 - tmp6; |
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| 229 | tmp4 = tmp10 + tmp5; |
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| 230 | |||
| 231 | block[0 + i] = (tmp0 + tmp7) >> 6; |
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| 232 | block[7 + i] = (tmp0 - tmp7) >> 6; |
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| 233 | block[1 + i] = (tmp1 + tmp6) >> 6; |
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| 234 | block[6 + i] = (tmp1 - tmp6) >> 6; |
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| 235 | block[2 + i] = (tmp2 + tmp5) >> 6; |
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| 236 | block[5 + i] = (tmp2 - tmp5) >> 6; |
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| 237 | block[4 + i] = (tmp3 + tmp4) >> 6; |
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| 238 | block[3 + i] = (tmp3 - tmp4) >> 6; |
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| 239 | } |
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| 240 | } |
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| 241 | |||
| 242 | static av_cold void init_vlcs(FourXContext *f) |
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| 243 | { |
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| 244 | static VLC_TYPE table[2][4][32][2]; |
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| 245 | int i, j; |
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| 246 | |||
| 247 | for (i = 0; i < 2; i++) { |
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| 248 | for (j = 0; j < 4; j++) { |
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| 249 | block_type_vlc[i][j].table = table[i][j]; |
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| 250 | block_type_vlc[i][j].table_allocated = 32; |
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| 251 | init_vlc(&block_type_vlc[i][j], BLOCK_TYPE_VLC_BITS, 7, |
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| 252 | &block_type_tab[i][j][0][1], 2, 1, |
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| 253 | &block_type_tab[i][j][0][0], 2, 1, |
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| 254 | INIT_VLC_USE_NEW_STATIC); |
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| 255 | } |
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| 256 | } |
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| 257 | } |
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| 258 | |||
| 259 | static void init_mv(FourXContext *f, int linesize) |
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| 260 | { |
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| 261 | int i; |
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| 262 | |||
| 263 | for (i = 0; i < 256; i++) { |
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| 264 | if (f->version > 1) |
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| 265 | f->mv[i] = mv[i][0] + mv[i][1] * linesize / 2; |
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| 266 | else |
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| 267 | f->mv[i] = (i & 15) - 8 + ((i >> 4) - 8) * linesize / 2; |
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| 268 | } |
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| 269 | } |
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| 270 | |||
| 271 | #if HAVE_BIGENDIAN |
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| 272 | #define LE_CENTRIC_MUL(dst, src, scale, dc) \ |
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| 273 | { \ |
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| 274 | unsigned tmpval = AV_RN32(src); \ |
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| 275 | tmpval = (tmpval << 16) | (tmpval >> 16); \ |
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| 276 | tmpval = tmpval * (scale) + (dc); \ |
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| 277 | tmpval = (tmpval << 16) | (tmpval >> 16); \ |
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| 278 | AV_WN32A(dst, tmpval); \ |
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| 279 | } |
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| 280 | #else |
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| 281 | #define LE_CENTRIC_MUL(dst, src, scale, dc) \ |
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| 282 | { \ |
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| 283 | unsigned tmpval = AV_RN32(src) * (scale) + (dc); \ |
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| 284 | AV_WN32A(dst, tmpval); \ |
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| 285 | } |
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| 286 | #endif |
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| 287 | |||
| 288 | static inline void mcdc(uint16_t *dst, const uint16_t *src, int log2w, |
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| 289 | int h, int stride, int scale, unsigned dc) |
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| 290 | { |
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| 291 | int i; |
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| 292 | dc *= 0x10001; |
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| 293 | |||
| 294 | switch (log2w) { |
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| 295 | case 0: |
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| 296 | for (i = 0; i < h; i++) { |
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| 297 | dst[0] = scale * src[0] + dc; |
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| 298 | if (scale) |
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| 299 | src += stride; |
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| 300 | dst += stride; |
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| 301 | } |
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| 302 | break; |
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| 303 | case 1: |
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| 304 | for (i = 0; i < h; i++) { |
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| 305 | LE_CENTRIC_MUL(dst, src, scale, dc); |
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| 306 | if (scale) |
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| 307 | src += stride; |
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| 308 | dst += stride; |
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| 309 | } |
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| 310 | break; |
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| 311 | case 2: |
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| 312 | for (i = 0; i < h; i++) { |
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| 313 | LE_CENTRIC_MUL(dst, src, scale, dc); |
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| 314 | LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc); |
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| 315 | if (scale) |
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| 316 | src += stride; |
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| 317 | dst += stride; |
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| 318 | } |
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| 319 | break; |
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| 320 | case 3: |
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| 321 | for (i = 0; i < h; i++) { |
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| 322 | LE_CENTRIC_MUL(dst, src, scale, dc); |
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| 323 | LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc); |
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| 324 | LE_CENTRIC_MUL(dst + 4, src + 4, scale, dc); |
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| 325 | LE_CENTRIC_MUL(dst + 6, src + 6, scale, dc); |
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| 326 | if (scale) |
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| 327 | src += stride; |
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| 328 | dst += stride; |
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| 329 | } |
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| 330 | break; |
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| 331 | default: |
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| 332 | av_assert0(0); |
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| 333 | } |
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| 334 | } |
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| 335 | |||
| 336 | static int decode_p_block(FourXContext *f, uint16_t *dst, uint16_t *src, |
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| 337 | int log2w, int log2h, int stride) |
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| 338 | { |
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| 339 | const int index = size2index[log2h][log2w]; |
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| 340 | const int h = 1 << log2h; |
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| 341 | int code = get_vlc2(&f->gb, |
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| 342 | block_type_vlc[1 - (f->version > 1)][index].table, |
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| 343 | BLOCK_TYPE_VLC_BITS, 1); |
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| 344 | uint16_t *start = (uint16_t *)f->last_picture->data[0]; |
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| 345 | uint16_t *end = start + stride * (f->avctx->height - h + 1) - (1 << log2w); |
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| 346 | int ret; |
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| 347 | int scale = 1; |
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| 348 | unsigned dc = 0; |
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| 349 | |||
| 350 | av_assert0(code >= 0 && code <= 6 && log2w >= 0); |
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| 351 | |||
| 352 | if (code == 1) { |
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| 353 | log2h--; |
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| 354 | if ((ret = decode_p_block(f, dst, src, log2w, log2h, stride)) < 0) |
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| 355 | return ret; |
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| 356 | return decode_p_block(f, dst + (stride << log2h), |
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| 357 | src + (stride << log2h), |
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| 358 | log2w, log2h, stride); |
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| 359 | } else if (code == 2) { |
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| 360 | log2w--; |
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| 361 | if ((ret = decode_p_block(f, dst , src, log2w, log2h, stride)) < 0) |
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| 362 | return ret; |
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| 363 | return decode_p_block(f, dst + (1 << log2w), |
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| 364 | src + (1 << log2w), |
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| 365 | log2w, log2h, stride); |
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| 366 | } else if (code == 6) { |
||
| 367 | if (bytestream2_get_bytes_left(&f->g2) < 4) { |
||
| 368 | av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); |
||
| 369 | return AVERROR_INVALIDDATA; |
||
| 370 | } |
||
| 371 | if (log2w) { |
||
| 372 | dst[0] = bytestream2_get_le16u(&f->g2); |
||
| 373 | dst[1] = bytestream2_get_le16u(&f->g2); |
||
| 374 | } else { |
||
| 375 | dst[0] = bytestream2_get_le16u(&f->g2); |
||
| 376 | dst[stride] = bytestream2_get_le16u(&f->g2); |
||
| 377 | } |
||
| 378 | return 0; |
||
| 379 | } |
||
| 380 | |||
| 381 | if ((code&3)==0 && bytestream2_get_bytes_left(&f->g) < 1) { |
||
| 382 | av_log(f->avctx, AV_LOG_ERROR, "bytestream overread\n"); |
||
| 383 | return AVERROR_INVALIDDATA; |
||
| 384 | } |
||
| 385 | |||
| 386 | if (code == 0) { |
||
| 387 | src += f->mv[bytestream2_get_byte(&f->g)]; |
||
| 388 | } else if (code == 3 && f->version >= 2) { |
||
| 389 | return 0; |
||
| 390 | } else if (code == 4) { |
||
| 391 | src += f->mv[bytestream2_get_byte(&f->g)]; |
||
| 392 | if (bytestream2_get_bytes_left(&f->g2) < 2){ |
||
| 393 | av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); |
||
| 394 | return AVERROR_INVALIDDATA; |
||
| 395 | } |
||
| 396 | dc = bytestream2_get_le16(&f->g2); |
||
| 397 | } else if (code == 5) { |
||
| 398 | if (bytestream2_get_bytes_left(&f->g2) < 2){ |
||
| 399 | av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); |
||
| 400 | return AVERROR_INVALIDDATA; |
||
| 401 | } |
||
| 402 | av_assert0(start <= src && src <= end); |
||
| 403 | scale = 0; |
||
| 404 | dc = bytestream2_get_le16(&f->g2); |
||
| 405 | } |
||
| 406 | |||
| 407 | if (start > src || src > end) { |
||
| 408 | av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n"); |
||
| 409 | return AVERROR_INVALIDDATA; |
||
| 410 | } |
||
| 411 | |||
| 412 | mcdc(dst, src, log2w, h, stride, scale, dc); |
||
| 413 | |||
| 414 | return 0; |
||
| 415 | } |
||
| 416 | |||
| 417 | static int decode_p_frame(FourXContext *f, AVFrame *frame, |
||
| 418 | const uint8_t *buf, int length) |
||
| 419 | { |
||
| 420 | int x, y; |
||
| 421 | const int width = f->avctx->width; |
||
| 422 | const int height = f->avctx->height; |
||
| 423 | uint16_t *dst = (uint16_t *)frame->data[0]; |
||
| 424 | const int stride = frame->linesize[0] >> 1; |
||
| 425 | uint16_t *src; |
||
| 426 | unsigned int bitstream_size, bytestream_size, wordstream_size, extra, |
||
| 427 | bytestream_offset, wordstream_offset; |
||
| 428 | int ret; |
||
| 429 | |||
| 430 | if (!f->last_picture->data[0]) { |
||
| 431 | if ((ret = ff_get_buffer(f->avctx, f->last_picture, |
||
| 432 | AV_GET_BUFFER_FLAG_REF)) < 0) { |
||
| 433 | return ret; |
||
| 434 | } |
||
| 435 | for (y=0; y |
||
| 436 | memset(f->last_picture->data[0] + y*f->last_picture->linesize[0], 0, 2*f->avctx->width); |
||
| 437 | } |
||
| 438 | |||
| 439 | src = (uint16_t *)f->last_picture->data[0]; |
||
| 440 | |||
| 441 | if (f->version > 1) { |
||
| 442 | extra = 20; |
||
| 443 | if (length < extra) |
||
| 444 | return AVERROR_INVALIDDATA; |
||
| 445 | bitstream_size = AV_RL32(buf + 8); |
||
| 446 | wordstream_size = AV_RL32(buf + 12); |
||
| 447 | bytestream_size = AV_RL32(buf + 16); |
||
| 448 | } else { |
||
| 449 | extra = 0; |
||
| 450 | bitstream_size = AV_RL16(buf - 4); |
||
| 451 | wordstream_size = AV_RL16(buf - 2); |
||
| 452 | bytestream_size = FFMAX(length - bitstream_size - wordstream_size, 0); |
||
| 453 | } |
||
| 454 | |||
| 455 | if (bitstream_size > length || bitstream_size >= INT_MAX/8 || |
||
| 456 | bytestream_size > length - bitstream_size || |
||
| 457 | wordstream_size > length - bytestream_size - bitstream_size || |
||
| 458 | extra > length - bytestream_size - bitstream_size - wordstream_size) { |
||
| 459 | av_log(f->avctx, AV_LOG_ERROR, "lengths %d %d %d %d\n", bitstream_size, bytestream_size, wordstream_size, |
||
| 460 | bitstream_size+ bytestream_size+ wordstream_size - length); |
||
| 461 | return AVERROR_INVALIDDATA; |
||
| 462 | } |
||
| 463 | |||
| 464 | av_fast_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, |
||
| 465 | bitstream_size + FF_INPUT_BUFFER_PADDING_SIZE); |
||
| 466 | if (!f->bitstream_buffer) |
||
| 467 | return AVERROR(ENOMEM); |
||
| 468 | f->dsp.bswap_buf(f->bitstream_buffer, (const uint32_t*)(buf + extra), |
||
| 469 | bitstream_size / 4); |
||
| 470 | memset((uint8_t*)f->bitstream_buffer + bitstream_size, |
||
| 471 | 0, FF_INPUT_BUFFER_PADDING_SIZE); |
||
| 472 | init_get_bits(&f->gb, f->bitstream_buffer, 8 * bitstream_size); |
||
| 473 | |||
| 474 | wordstream_offset = extra + bitstream_size; |
||
| 475 | bytestream_offset = extra + bitstream_size + wordstream_size; |
||
| 476 | bytestream2_init(&f->g2, buf + wordstream_offset, |
||
| 477 | length - wordstream_offset); |
||
| 478 | bytestream2_init(&f->g, buf + bytestream_offset, |
||
| 479 | length - bytestream_offset); |
||
| 480 | |||
| 481 | init_mv(f, frame->linesize[0]); |
||
| 482 | |||
| 483 | for (y = 0; y < height; y += 8) { |
||
| 484 | for (x = 0; x < width; x += 8) |
||
| 485 | if ((ret = decode_p_block(f, dst + x, src + x, 3, 3, stride)) < 0) |
||
| 486 | return ret; |
||
| 487 | src += 8 * stride; |
||
| 488 | dst += 8 * stride; |
||
| 489 | } |
||
| 490 | |||
| 491 | return 0; |
||
| 492 | } |
||
| 493 | |||
| 494 | /** |
||
| 495 | * decode block and dequantize. |
||
| 496 | * Note this is almost identical to MJPEG. |
||
| 497 | */ |
||
| 498 | static int decode_i_block(FourXContext *f, int16_t *block) |
||
| 499 | { |
||
| 500 | int code, i, j, level, val; |
||
| 501 | |||
| 502 | if (get_bits_left(&f->gb) < 2){ |
||
| 503 | av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->gb)); |
||
| 504 | return -1; |
||
| 505 | } |
||
| 506 | |||
| 507 | /* DC coef */ |
||
| 508 | val = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3); |
||
| 509 | if (val >> 4) { |
||
| 510 | av_log(f->avctx, AV_LOG_ERROR, "error dc run != 0\n"); |
||
| 511 | return AVERROR_INVALIDDATA; |
||
| 512 | } |
||
| 513 | |||
| 514 | if (val) |
||
| 515 | val = get_xbits(&f->gb, val); |
||
| 516 | |||
| 517 | val = val * dequant_table[0] + f->last_dc; |
||
| 518 | f->last_dc = block[0] = val; |
||
| 519 | /* AC coefs */ |
||
| 520 | i = 1; |
||
| 521 | for (;;) { |
||
| 522 | code = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3); |
||
| 523 | |||
| 524 | /* EOB */ |
||
| 525 | if (code == 0) |
||
| 526 | break; |
||
| 527 | if (code == 0xf0) { |
||
| 528 | i += 16; |
||
| 529 | } else { |
||
| 530 | if (code & 0xf) { |
||
| 531 | level = get_xbits(&f->gb, code & 0xf); |
||
| 532 | } else { |
||
| 533 | av_log(f->avctx, AV_LOG_ERROR, "0 coeff\n"); |
||
| 534 | return AVERROR_INVALIDDATA; |
||
| 535 | } |
||
| 536 | i += code >> 4; |
||
| 537 | if (i >= 64) { |
||
| 538 | av_log(f->avctx, AV_LOG_ERROR, "run %d oveflow\n", i); |
||
| 539 | return 0; |
||
| 540 | } |
||
| 541 | |||
| 542 | j = ff_zigzag_direct[i]; |
||
| 543 | block[j] = level * dequant_table[j]; |
||
| 544 | i++; |
||
| 545 | if (i >= 64) |
||
| 546 | break; |
||
| 547 | } |
||
| 548 | } |
||
| 549 | |||
| 550 | return 0; |
||
| 551 | } |
||
| 552 | |||
| 553 | static inline void idct_put(FourXContext *f, AVFrame *frame, int x, int y) |
||
| 554 | { |
||
| 555 | int16_t (*block)[64] = f->block; |
||
| 556 | int stride = frame->linesize[0] >> 1; |
||
| 557 | int i; |
||
| 558 | uint16_t *dst = ((uint16_t*)frame->data[0]) + y * stride + x; |
||
| 559 | |||
| 560 | for (i = 0; i < 4; i++) { |
||
| 561 | block[i][0] += 0x80 * 8 * 8; |
||
| 562 | idct(block[i]); |
||
| 563 | } |
||
| 564 | |||
| 565 | if (!(f->avctx->flags & CODEC_FLAG_GRAY)) { |
||
| 566 | for (i = 4; i < 6; i++) |
||
| 567 | idct(block[i]); |
||
| 568 | } |
||
| 569 | |||
| 570 | /* Note transform is: |
||
| 571 | * y = ( 1b + 4g + 2r) / 14 |
||
| 572 | * cb = ( 3b - 2g - 1r) / 14 |
||
| 573 | * cr = (-1b - 4g + 5r) / 14 */ |
||
| 574 | for (y = 0; y < 8; y++) { |
||
| 575 | for (x = 0; x < 8; x++) { |
||
| 576 | int16_t *temp = block[(x >> 2) + 2 * (y >> 2)] + |
||
| 577 | 2 * (x & 3) + 2 * 8 * (y & 3); // FIXME optimize |
||
| 578 | int cb = block[4][x + 8 * y]; |
||
| 579 | int cr = block[5][x + 8 * y]; |
||
| 580 | int cg = (cb + cr) >> 1; |
||
| 581 | int y; |
||
| 582 | |||
| 583 | cb += cb; |
||
| 584 | |||
| 585 | y = temp[0]; |
||
| 586 | dst[0] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); |
||
| 587 | y = temp[1]; |
||
| 588 | dst[1] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); |
||
| 589 | y = temp[8]; |
||
| 590 | dst[stride] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); |
||
| 591 | y = temp[9]; |
||
| 592 | dst[1 + stride] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); |
||
| 593 | dst += 2; |
||
| 594 | } |
||
| 595 | dst += 2 * stride - 2 * 8; |
||
| 596 | } |
||
| 597 | } |
||
| 598 | |||
| 599 | static int decode_i_mb(FourXContext *f) |
||
| 600 | { |
||
| 601 | int ret; |
||
| 602 | int i; |
||
| 603 | |||
| 604 | f->dsp.clear_blocks(f->block[0]); |
||
| 605 | |||
| 606 | for (i = 0; i < 6; i++) |
||
| 607 | if ((ret = decode_i_block(f, f->block[i])) < 0) |
||
| 608 | return ret; |
||
| 609 | |||
| 610 | return 0; |
||
| 611 | } |
||
| 612 | |||
| 613 | static const uint8_t *read_huffman_tables(FourXContext *f, |
||
| 614 | const uint8_t * const buf, |
||
| 615 | int buf_size) |
||
| 616 | { |
||
| 617 | int frequency[512] = { 0 }; |
||
| 618 | uint8_t flag[512]; |
||
| 619 | int up[512]; |
||
| 620 | uint8_t len_tab[257]; |
||
| 621 | int bits_tab[257]; |
||
| 622 | int start, end; |
||
| 623 | const uint8_t *ptr = buf; |
||
| 624 | const uint8_t *ptr_end = buf + buf_size; |
||
| 625 | int j; |
||
| 626 | |||
| 627 | memset(up, -1, sizeof(up)); |
||
| 628 | |||
| 629 | start = *ptr++; |
||
| 630 | end = *ptr++; |
||
| 631 | for (;;) { |
||
| 632 | int i; |
||
| 633 | |||
| 634 | if (ptr_end - ptr < FFMAX(end - start + 1, 0) + 1) { |
||
| 635 | av_log(f->avctx, AV_LOG_ERROR, "invalid data in read_huffman_tables\n"); |
||
| 636 | return NULL; |
||
| 637 | } |
||
| 638 | |||
| 639 | for (i = start; i <= end; i++) |
||
| 640 | frequency[i] = *ptr++; |
||
| 641 | start = *ptr++; |
||
| 642 | if (start == 0) |
||
| 643 | break; |
||
| 644 | |||
| 645 | end = *ptr++; |
||
| 646 | } |
||
| 647 | frequency[256] = 1; |
||
| 648 | |||
| 649 | while ((ptr - buf) & 3) |
||
| 650 | ptr++; // 4byte align |
||
| 651 | |||
| 652 | if (ptr > ptr_end) { |
||
| 653 | av_log(f->avctx, AV_LOG_ERROR, "ptr overflow in read_huffman_tables\n"); |
||
| 654 | return NULL; |
||
| 655 | } |
||
| 656 | |||
| 657 | for (j = 257; j < 512; j++) { |
||
| 658 | int min_freq[2] = { 256 * 256, 256 * 256 }; |
||
| 659 | int smallest[2] = { 0, 0 }; |
||
| 660 | int i; |
||
| 661 | for (i = 0; i < j; i++) { |
||
| 662 | if (frequency[i] == 0) |
||
| 663 | continue; |
||
| 664 | if (frequency[i] < min_freq[1]) { |
||
| 665 | if (frequency[i] < min_freq[0]) { |
||
| 666 | min_freq[1] = min_freq[0]; |
||
| 667 | smallest[1] = smallest[0]; |
||
| 668 | min_freq[0] = frequency[i]; |
||
| 669 | smallest[0] = i; |
||
| 670 | } else { |
||
| 671 | min_freq[1] = frequency[i]; |
||
| 672 | smallest[1] = i; |
||
| 673 | } |
||
| 674 | } |
||
| 675 | } |
||
| 676 | if (min_freq[1] == 256 * 256) |
||
| 677 | break; |
||
| 678 | |||
| 679 | frequency[j] = min_freq[0] + min_freq[1]; |
||
| 680 | flag[smallest[0]] = 0; |
||
| 681 | flag[smallest[1]] = 1; |
||
| 682 | up[smallest[0]] = |
||
| 683 | up[smallest[1]] = j; |
||
| 684 | frequency[smallest[0]] = frequency[smallest[1]] = 0; |
||
| 685 | } |
||
| 686 | |||
| 687 | for (j = 0; j < 257; j++) { |
||
| 688 | int node, len = 0, bits = 0; |
||
| 689 | |||
| 690 | for (node = j; up[node] != -1; node = up[node]) { |
||
| 691 | bits += flag[node] << len; |
||
| 692 | len++; |
||
| 693 | if (len > 31) |
||
| 694 | // can this happen at all ? |
||
| 695 | av_log(f->avctx, AV_LOG_ERROR, |
||
| 696 | "vlc length overflow\n"); |
||
| 697 | } |
||
| 698 | |||
| 699 | bits_tab[j] = bits; |
||
| 700 | len_tab[j] = len; |
||
| 701 | } |
||
| 702 | |||
| 703 | if (init_vlc(&f->pre_vlc, ACDC_VLC_BITS, 257, len_tab, 1, 1, |
||
| 704 | bits_tab, 4, 4, 0)) |
||
| 705 | return NULL; |
||
| 706 | |||
| 707 | return ptr; |
||
| 708 | } |
||
| 709 | |||
| 710 | static int mix(int c0, int c1) |
||
| 711 | { |
||
| 712 | int blue = 2 * (c0 & 0x001F) + (c1 & 0x001F); |
||
| 713 | int green = (2 * (c0 & 0x03E0) + (c1 & 0x03E0)) >> 5; |
||
| 714 | int red = 2 * (c0 >> 10) + (c1 >> 10); |
||
| 715 | return red / 3 * 1024 + green / 3 * 32 + blue / 3; |
||
| 716 | } |
||
| 717 | |||
| 718 | static int decode_i2_frame(FourXContext *f, AVFrame *frame, const uint8_t *buf, int length) |
||
| 719 | { |
||
| 720 | int x, y, x2, y2; |
||
| 721 | const int width = f->avctx->width; |
||
| 722 | const int height = f->avctx->height; |
||
| 723 | const int mbs = (FFALIGN(width, 16) >> 4) * (FFALIGN(height, 16) >> 4); |
||
| 724 | uint16_t *dst = (uint16_t*)frame->data[0]; |
||
| 725 | const int stride = frame->linesize[0]>>1; |
||
| 726 | const uint8_t *buf_end = buf + length; |
||
| 727 | GetByteContext g3; |
||
| 728 | |||
| 729 | if (length < mbs * 8) { |
||
| 730 | av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n"); |
||
| 731 | return AVERROR_INVALIDDATA; |
||
| 732 | } |
||
| 733 | bytestream2_init(&g3, buf, length); |
||
| 734 | |||
| 735 | for (y = 0; y < height; y += 16) { |
||
| 736 | for (x = 0; x < width; x += 16) { |
||
| 737 | unsigned int color[4] = { 0 }, bits; |
||
| 738 | if (buf_end - buf < 8) |
||
| 739 | return -1; |
||
| 740 | // warning following is purely guessed ... |
||
| 741 | color[0] = bytestream2_get_le16u(&g3); |
||
| 742 | color[1] = bytestream2_get_le16u(&g3); |
||
| 743 | |||
| 744 | if (color[0] & 0x8000) |
||
| 745 | av_log(f->avctx, AV_LOG_ERROR, "unk bit 1\n"); |
||
| 746 | if (color[1] & 0x8000) |
||
| 747 | av_log(f->avctx, AV_LOG_ERROR, "unk bit 2\n"); |
||
| 748 | |||
| 749 | color[2] = mix(color[0], color[1]); |
||
| 750 | color[3] = mix(color[1], color[0]); |
||
| 751 | |||
| 752 | bits = bytestream2_get_le32u(&g3); |
||
| 753 | for (y2 = 0; y2 < 16; y2++) { |
||
| 754 | for (x2 = 0; x2 < 16; x2++) { |
||
| 755 | int index = 2 * (x2 >> 2) + 8 * (y2 >> 2); |
||
| 756 | dst[y2 * stride + x2] = color[(bits >> index) & 3]; |
||
| 757 | } |
||
| 758 | } |
||
| 759 | dst += 16; |
||
| 760 | } |
||
| 761 | dst += 16 * stride - x; |
||
| 762 | } |
||
| 763 | |||
| 764 | return 0; |
||
| 765 | } |
||
| 766 | |||
| 767 | static int decode_i_frame(FourXContext *f, AVFrame *frame, const uint8_t *buf, int length) |
||
| 768 | { |
||
| 769 | int x, y, ret; |
||
| 770 | const int width = f->avctx->width; |
||
| 771 | const int height = f->avctx->height; |
||
| 772 | const unsigned int bitstream_size = AV_RL32(buf); |
||
| 773 | unsigned int prestream_size; |
||
| 774 | const uint8_t *prestream; |
||
| 775 | |||
| 776 | if (bitstream_size > (1 << 26)) |
||
| 777 | return AVERROR_INVALIDDATA; |
||
| 778 | |||
| 779 | if (length < bitstream_size + 12) { |
||
| 780 | av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n"); |
||
| 781 | return AVERROR_INVALIDDATA; |
||
| 782 | } |
||
| 783 | |||
| 784 | prestream_size = 4 * AV_RL32(buf + bitstream_size + 4); |
||
| 785 | prestream = buf + bitstream_size + 12; |
||
| 786 | |||
| 787 | if (prestream_size + bitstream_size + 12 != length |
||
| 788 | || prestream_size > (1 << 26)) { |
||
| 789 | av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d %d\n", |
||
| 790 | prestream_size, bitstream_size, length); |
||
| 791 | return AVERROR_INVALIDDATA; |
||
| 792 | } |
||
| 793 | |||
| 794 | prestream = read_huffman_tables(f, prestream, prestream_size); |
||
| 795 | if (!prestream) { |
||
| 796 | av_log(f->avctx, AV_LOG_ERROR, "Error reading Huffman tables.\n"); |
||
| 797 | return AVERROR_INVALIDDATA; |
||
| 798 | } |
||
| 799 | |||
| 800 | av_assert0(prestream <= buf + length); |
||
| 801 | |||
| 802 | init_get_bits(&f->gb, buf + 4, 8 * bitstream_size); |
||
| 803 | |||
| 804 | prestream_size = length + buf - prestream; |
||
| 805 | |||
| 806 | av_fast_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, |
||
| 807 | prestream_size + FF_INPUT_BUFFER_PADDING_SIZE); |
||
| 808 | if (!f->bitstream_buffer) |
||
| 809 | return AVERROR(ENOMEM); |
||
| 810 | f->dsp.bswap_buf(f->bitstream_buffer, (const uint32_t*)prestream, |
||
| 811 | prestream_size / 4); |
||
| 812 | memset((uint8_t*)f->bitstream_buffer + prestream_size, |
||
| 813 | 0, FF_INPUT_BUFFER_PADDING_SIZE); |
||
| 814 | init_get_bits(&f->pre_gb, f->bitstream_buffer, 8 * prestream_size); |
||
| 815 | |||
| 816 | f->last_dc = 0 * 128 * 8 * 8; |
||
| 817 | |||
| 818 | for (y = 0; y < height; y += 16) { |
||
| 819 | for (x = 0; x < width; x += 16) { |
||
| 820 | if ((ret = decode_i_mb(f)) < 0) |
||
| 821 | return ret; |
||
| 822 | |||
| 823 | idct_put(f, frame, x, y); |
||
| 824 | } |
||
| 825 | } |
||
| 826 | |||
| 827 | if (get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3) != 256) |
||
| 828 | av_log(f->avctx, AV_LOG_ERROR, "end mismatch\n"); |
||
| 829 | |||
| 830 | return 0; |
||
| 831 | } |
||
| 832 | |||
| 833 | static int decode_frame(AVCodecContext *avctx, void *data, |
||
| 834 | int *got_frame, AVPacket *avpkt) |
||
| 835 | { |
||
| 836 | const uint8_t *buf = avpkt->data; |
||
| 837 | int buf_size = avpkt->size; |
||
| 838 | FourXContext *const f = avctx->priv_data; |
||
| 839 | AVFrame *picture = data; |
||
| 840 | int i, frame_4cc, frame_size, ret; |
||
| 841 | |||
| 842 | if (buf_size < 20) |
||
| 843 | return AVERROR_INVALIDDATA; |
||
| 844 | |||
| 845 | av_assert0(avctx->width % 16 == 0 && avctx->height % 16 == 0); |
||
| 846 | |||
| 847 | if (buf_size < AV_RL32(buf + 4) + 8) { |
||
| 848 | av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d\n", |
||
| 849 | buf_size, AV_RL32(buf + 4)); |
||
| 850 | return AVERROR_INVALIDDATA; |
||
| 851 | } |
||
| 852 | |||
| 853 | frame_4cc = AV_RL32(buf); |
||
| 854 | |||
| 855 | if (frame_4cc == AV_RL32("cfrm")) { |
||
| 856 | int free_index = -1; |
||
| 857 | int id, whole_size; |
||
| 858 | const int data_size = buf_size - 20; |
||
| 859 | CFrameBuffer *cfrm; |
||
| 860 | |||
| 861 | if (f->version <= 1) { |
||
| 862 | av_log(f->avctx, AV_LOG_ERROR, "cfrm in version %d\n", f->version); |
||
| 863 | return AVERROR_INVALIDDATA; |
||
| 864 | } |
||
| 865 | |||
| 866 | id = AV_RL32(buf + 12); |
||
| 867 | whole_size = AV_RL32(buf + 16); |
||
| 868 | |||
| 869 | if (data_size < 0 || whole_size < 0) { |
||
| 870 | av_log(f->avctx, AV_LOG_ERROR, "sizes invalid\n"); |
||
| 871 | return AVERROR_INVALIDDATA; |
||
| 872 | } |
||
| 873 | |||
| 874 | for (i = 0; i < CFRAME_BUFFER_COUNT; i++) |
||
| 875 | if (f->cfrm[i].id && f->cfrm[i].id < avctx->frame_number) |
||
| 876 | av_log(f->avctx, AV_LOG_ERROR, "lost c frame %d\n", |
||
| 877 | f->cfrm[i].id); |
||
| 878 | |||
| 879 | for (i = 0; i < CFRAME_BUFFER_COUNT; i++) { |
||
| 880 | if (f->cfrm[i].id == id) |
||
| 881 | break; |
||
| 882 | if (f->cfrm[i].size == 0) |
||
| 883 | free_index = i; |
||
| 884 | } |
||
| 885 | |||
| 886 | if (i >= CFRAME_BUFFER_COUNT) { |
||
| 887 | i = free_index; |
||
| 888 | f->cfrm[i].id = id; |
||
| 889 | } |
||
| 890 | cfrm = &f->cfrm[i]; |
||
| 891 | |||
| 892 | if (data_size > UINT_MAX - cfrm->size - FF_INPUT_BUFFER_PADDING_SIZE) |
||
| 893 | return AVERROR_INVALIDDATA; |
||
| 894 | |||
| 895 | cfrm->data = av_fast_realloc(cfrm->data, &cfrm->allocated_size, |
||
| 896 | cfrm->size + data_size + FF_INPUT_BUFFER_PADDING_SIZE); |
||
| 897 | // explicit check needed as memcpy below might not catch a NULL |
||
| 898 | if (!cfrm->data) { |
||
| 899 | av_log(f->avctx, AV_LOG_ERROR, "realloc failure\n"); |
||
| 900 | return AVERROR(ENOMEM); |
||
| 901 | } |
||
| 902 | |||
| 903 | memcpy(cfrm->data + cfrm->size, buf + 20, data_size); |
||
| 904 | cfrm->size += data_size; |
||
| 905 | |||
| 906 | if (cfrm->size >= whole_size) { |
||
| 907 | buf = cfrm->data; |
||
| 908 | frame_size = cfrm->size; |
||
| 909 | |||
| 910 | if (id != avctx->frame_number) |
||
| 911 | av_log(f->avctx, AV_LOG_ERROR, "cframe id mismatch %d %d\n", |
||
| 912 | id, avctx->frame_number); |
||
| 913 | |||
| 914 | if (f->version <= 1) |
||
| 915 | return AVERROR_INVALIDDATA; |
||
| 916 | |||
| 917 | cfrm->size = cfrm->id = 0; |
||
| 918 | frame_4cc = AV_RL32("pfrm"); |
||
| 919 | } else |
||
| 920 | return buf_size; |
||
| 921 | } else { |
||
| 922 | buf = buf + 12; |
||
| 923 | frame_size = buf_size - 12; |
||
| 924 | } |
||
| 925 | |||
| 926 | FFSWAP(AVFrame*, f->current_picture, f->last_picture); |
||
| 927 | |||
| 928 | // alternatively we would have to use our own buffer management |
||
| 929 | avctx->flags |= CODEC_FLAG_EMU_EDGE; |
||
| 930 | |||
| 931 | if ((ret = ff_reget_buffer(avctx, f->current_picture)) < 0) |
||
| 932 | return ret; |
||
| 933 | |||
| 934 | if (frame_4cc == AV_RL32("ifr2")) { |
||
| 935 | f->current_picture->pict_type = AV_PICTURE_TYPE_I; |
||
| 936 | if ((ret = decode_i2_frame(f, f->current_picture, buf - 4, frame_size + 4)) < 0) { |
||
| 937 | av_log(f->avctx, AV_LOG_ERROR, "decode i2 frame failed\n"); |
||
| 938 | return ret; |
||
| 939 | } |
||
| 940 | } else if (frame_4cc == AV_RL32("ifrm")) { |
||
| 941 | f->current_picture->pict_type = AV_PICTURE_TYPE_I; |
||
| 942 | if ((ret = decode_i_frame(f, f->current_picture, buf, frame_size)) < 0) { |
||
| 943 | av_log(f->avctx, AV_LOG_ERROR, "decode i frame failed\n"); |
||
| 944 | return ret; |
||
| 945 | } |
||
| 946 | } else if (frame_4cc == AV_RL32("pfrm") || frame_4cc == AV_RL32("pfr2")) { |
||
| 947 | f->current_picture->pict_type = AV_PICTURE_TYPE_P; |
||
| 948 | if ((ret = decode_p_frame(f, f->current_picture, buf, frame_size)) < 0) { |
||
| 949 | av_log(f->avctx, AV_LOG_ERROR, "decode p frame failed\n"); |
||
| 950 | return ret; |
||
| 951 | } |
||
| 952 | } else if (frame_4cc == AV_RL32("snd_")) { |
||
| 953 | av_log(avctx, AV_LOG_ERROR, "ignoring snd_ chunk length:%d\n", |
||
| 954 | buf_size); |
||
| 955 | } else { |
||
| 956 | av_log(avctx, AV_LOG_ERROR, "ignoring unknown chunk length:%d\n", |
||
| 957 | buf_size); |
||
| 958 | } |
||
| 959 | |||
| 960 | f->current_picture->key_frame = f->current_picture->pict_type == AV_PICTURE_TYPE_I; |
||
| 961 | |||
| 962 | if ((ret = av_frame_ref(picture, f->current_picture)) < 0) |
||
| 963 | return ret; |
||
| 964 | *got_frame = 1; |
||
| 965 | |||
| 966 | emms_c(); |
||
| 967 | |||
| 968 | return buf_size; |
||
| 969 | } |
||
| 970 | |||
| 971 | static av_cold int decode_init(AVCodecContext *avctx) |
||
| 972 | { |
||
| 973 | FourXContext * const f = avctx->priv_data; |
||
| 974 | |||
| 975 | if (avctx->extradata_size != 4 || !avctx->extradata) { |
||
| 976 | av_log(avctx, AV_LOG_ERROR, "extradata wrong or missing\n"); |
||
| 977 | return AVERROR_INVALIDDATA; |
||
| 978 | } |
||
| 979 | if((avctx->width % 16) || (avctx->height % 16)) { |
||
| 980 | av_log(avctx, AV_LOG_ERROR, "unsupported width/height\n"); |
||
| 981 | return AVERROR_INVALIDDATA; |
||
| 982 | } |
||
| 983 | |||
| 984 | f->version = AV_RL32(avctx->extradata) >> 16; |
||
| 985 | ff_dsputil_init(&f->dsp, avctx); |
||
| 986 | f->avctx = avctx; |
||
| 987 | init_vlcs(f); |
||
| 988 | |||
| 989 | if (f->version > 2) |
||
| 990 | avctx->pix_fmt = AV_PIX_FMT_RGB565; |
||
| 991 | else |
||
| 992 | avctx->pix_fmt = AV_PIX_FMT_BGR555; |
||
| 993 | |||
| 994 | f->current_picture = av_frame_alloc(); |
||
| 995 | f->last_picture = av_frame_alloc(); |
||
| 996 | if (!f->current_picture || !f->last_picture) |
||
| 997 | return AVERROR(ENOMEM); |
||
| 998 | |||
| 999 | return 0; |
||
| 1000 | } |
||
| 1001 | |||
| 1002 | |||
| 1003 | static av_cold int decode_end(AVCodecContext *avctx) |
||
| 1004 | { |
||
| 1005 | FourXContext * const f = avctx->priv_data; |
||
| 1006 | int i; |
||
| 1007 | |||
| 1008 | av_freep(&f->bitstream_buffer); |
||
| 1009 | f->bitstream_buffer_size = 0; |
||
| 1010 | for (i = 0; i < CFRAME_BUFFER_COUNT; i++) { |
||
| 1011 | av_freep(&f->cfrm[i].data); |
||
| 1012 | f->cfrm[i].allocated_size = 0; |
||
| 1013 | } |
||
| 1014 | ff_free_vlc(&f->pre_vlc); |
||
| 1015 | av_frame_free(&f->current_picture); |
||
| 1016 | av_frame_free(&f->last_picture); |
||
| 1017 | |||
| 1018 | return 0; |
||
| 1019 | } |
||
| 1020 | |||
| 1021 | AVCodec ff_fourxm_decoder = { |
||
| 1022 | .name = "4xm", |
||
| 1023 | .long_name = NULL_IF_CONFIG_SMALL("4X Movie"), |
||
| 1024 | .type = AVMEDIA_TYPE_VIDEO, |
||
| 1025 | .id = AV_CODEC_ID_4XM, |
||
| 1026 | .priv_data_size = sizeof(FourXContext), |
||
| 1027 | .init = decode_init, |
||
| 1028 | .close = decode_end, |
||
| 1029 | .decode = decode_frame, |
||
| 1030 | .capabilities = CODEC_CAP_DR1, |
||
| 1031 | }; |