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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * LOCO codec |
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| 3 | * Copyright (c) 2005 Konstantin Shishkov |
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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 | * LOCO codec. |
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| 25 | */ |
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| 26 | |||
| 27 | #include "avcodec.h" |
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| 28 | #include "get_bits.h" |
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| 29 | #include "golomb.h" |
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| 30 | #include "internal.h" |
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| 31 | #include "mathops.h" |
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| 32 | |||
| 33 | enum LOCO_MODE { |
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| 34 | LOCO_UNKN = 0, |
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| 35 | LOCO_CYUY2 = -1, |
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| 36 | LOCO_CRGB = -2, |
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| 37 | LOCO_CRGBA = -3, |
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| 38 | LOCO_CYV12 = -4, |
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| 39 | LOCO_YUY2 = 1, |
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| 40 | LOCO_UYVY = 2, |
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| 41 | LOCO_RGB = 3, |
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| 42 | LOCO_RGBA = 4, |
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| 43 | LOCO_YV12 = 5, |
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| 44 | }; |
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| 45 | |||
| 46 | typedef struct LOCOContext { |
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| 47 | AVCodecContext *avctx; |
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| 48 | int lossy; |
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| 49 | int mode; |
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| 50 | } LOCOContext; |
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| 51 | |||
| 52 | typedef struct RICEContext { |
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| 53 | GetBitContext gb; |
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| 54 | int save, run, run2; /* internal rice decoder state */ |
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| 55 | int sum, count; /* sum and count for getting rice parameter */ |
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| 56 | int lossy; |
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| 57 | } RICEContext; |
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| 58 | |||
| 59 | static int loco_get_rice_param(RICEContext *r) |
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| 60 | { |
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| 61 | int cnt = 0; |
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| 62 | int val = r->count; |
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| 63 | |||
| 64 | while (r->sum > val && cnt < 9) { |
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| 65 | val <<= 1; |
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| 66 | cnt++; |
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| 67 | } |
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| 68 | |||
| 69 | return cnt; |
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| 70 | } |
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| 71 | |||
| 72 | static inline void loco_update_rice_param(RICEContext *r, int val) |
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| 73 | { |
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| 74 | r->sum += val; |
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| 75 | r->count++; |
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| 76 | |||
| 77 | if (r->count == 16) { |
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| 78 | r->sum >>= 1; |
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| 79 | r->count >>= 1; |
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| 80 | } |
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| 81 | } |
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| 82 | |||
| 83 | static inline int loco_get_rice(RICEContext *r) |
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| 84 | { |
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| 85 | int v; |
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| 86 | if (r->run > 0) { /* we have zero run */ |
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| 87 | r->run--; |
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| 88 | loco_update_rice_param(r, 0); |
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| 89 | return 0; |
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| 90 | } |
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| 91 | v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0); |
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| 92 | loco_update_rice_param(r, (v + 1) >> 1); |
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| 93 | if (!v) { |
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| 94 | if (r->save >= 0) { |
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| 95 | r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0); |
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| 96 | if (r->run > 1) |
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| 97 | r->save += r->run + 1; |
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| 98 | else |
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| 99 | r->save -= 3; |
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| 100 | } else |
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| 101 | r->run2++; |
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| 102 | } else { |
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| 103 | v = ((v >> 1) + r->lossy) ^ -(v & 1); |
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| 104 | if (r->run2 > 0) { |
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| 105 | if (r->run2 > 2) |
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| 106 | r->save += r->run2; |
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| 107 | else |
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| 108 | r->save -= 3; |
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| 109 | r->run2 = 0; |
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| 110 | } |
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| 111 | } |
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| 112 | |||
| 113 | return v; |
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| 114 | } |
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| 115 | |||
| 116 | /* LOCO main predictor - LOCO-I/JPEG-LS predictor */ |
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| 117 | static inline int loco_predict(uint8_t* data, int stride, int step) |
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| 118 | { |
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| 119 | int a, b, c; |
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| 120 | |||
| 121 | a = data[-stride]; |
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| 122 | b = data[-step]; |
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| 123 | c = data[-stride - step]; |
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| 124 | |||
| 125 | return mid_pred(a, a + b - c, b); |
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| 126 | } |
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| 127 | |||
| 128 | static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height, |
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| 129 | int stride, const uint8_t *buf, int buf_size, int step) |
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| 130 | { |
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| 131 | RICEContext rc; |
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| 132 | int val; |
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| 133 | int i, j; |
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| 134 | |||
| 135 | if(buf_size<=0) |
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| 136 | return -1; |
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| 137 | |||
| 138 | init_get_bits8(&rc.gb, buf, buf_size); |
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| 139 | rc.save = 0; |
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| 140 | rc.run = 0; |
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| 141 | rc.run2 = 0; |
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| 142 | rc.lossy = l->lossy; |
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| 143 | |||
| 144 | rc.sum = 8; |
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| 145 | rc.count = 1; |
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| 146 | |||
| 147 | /* restore top left pixel */ |
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| 148 | val = loco_get_rice(&rc); |
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| 149 | data[0] = 128 + val; |
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| 150 | /* restore top line */ |
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| 151 | for (i = 1; i < width; i++) { |
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| 152 | val = loco_get_rice(&rc); |
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| 153 | data[i * step] = data[i * step - step] + val; |
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| 154 | } |
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| 155 | data += stride; |
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| 156 | for (j = 1; j < height; j++) { |
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| 157 | /* restore left column */ |
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| 158 | val = loco_get_rice(&rc); |
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| 159 | data[0] = data[-stride] + val; |
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| 160 | /* restore all other pixels */ |
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| 161 | for (i = 1; i < width; i++) { |
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| 162 | val = loco_get_rice(&rc); |
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| 163 | data[i * step] = loco_predict(&data[i * step], stride, step) + val; |
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| 164 | } |
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| 165 | data += stride; |
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| 166 | } |
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| 167 | |||
| 168 | return (get_bits_count(&rc.gb) + 7) >> 3; |
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| 169 | } |
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| 170 | |||
| 171 | static int decode_frame(AVCodecContext *avctx, |
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| 172 | void *data, int *got_frame, |
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| 173 | AVPacket *avpkt) |
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| 174 | { |
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| 175 | LOCOContext * const l = avctx->priv_data; |
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| 176 | const uint8_t *buf = avpkt->data; |
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| 177 | int buf_size = avpkt->size; |
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| 178 | AVFrame * const p = data; |
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| 179 | int decoded, ret; |
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| 180 | |||
| 181 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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| 182 | return ret; |
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| 183 | p->key_frame = 1; |
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| 184 | |||
| 185 | #define ADVANCE_BY_DECODED do { \ |
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| 186 | if (decoded < 0 || decoded >= buf_size) goto buf_too_small; \ |
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| 187 | buf += decoded; buf_size -= decoded; \ |
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| 188 | } while(0) |
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| 189 | switch(l->mode) { |
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| 190 | case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY: |
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| 191 | decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height, |
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| 192 | p->linesize[0], buf, buf_size, 1); |
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| 193 | ADVANCE_BY_DECODED; |
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| 194 | decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height, |
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| 195 | p->linesize[1], buf, buf_size, 1); |
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| 196 | ADVANCE_BY_DECODED; |
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| 197 | decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height, |
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| 198 | p->linesize[2], buf, buf_size, 1); |
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| 199 | break; |
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| 200 | case LOCO_CYV12: case LOCO_YV12: |
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| 201 | decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height, |
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| 202 | p->linesize[0], buf, buf_size, 1); |
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| 203 | ADVANCE_BY_DECODED; |
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| 204 | decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2, |
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| 205 | p->linesize[2], buf, buf_size, 1); |
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| 206 | ADVANCE_BY_DECODED; |
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| 207 | decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2, |
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| 208 | p->linesize[1], buf, buf_size, 1); |
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| 209 | break; |
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| 210 | case LOCO_CRGB: case LOCO_RGB: |
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| 211 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, |
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| 212 | -p->linesize[0], buf, buf_size, 3); |
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| 213 | ADVANCE_BY_DECODED; |
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| 214 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height, |
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| 215 | -p->linesize[0], buf, buf_size, 3); |
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| 216 | ADVANCE_BY_DECODED; |
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| 217 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height, |
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| 218 | -p->linesize[0], buf, buf_size, 3); |
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| 219 | break; |
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| 220 | case LOCO_CRGBA: |
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| 221 | case LOCO_RGBA: |
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| 222 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, |
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| 223 | -p->linesize[0], buf, buf_size, 4); |
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| 224 | ADVANCE_BY_DECODED; |
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| 225 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height, |
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| 226 | -p->linesize[0], buf, buf_size, 4); |
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| 227 | ADVANCE_BY_DECODED; |
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| 228 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height, |
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| 229 | -p->linesize[0], buf, buf_size, 4); |
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| 230 | ADVANCE_BY_DECODED; |
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| 231 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 3, avctx->width, avctx->height, |
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| 232 | -p->linesize[0], buf, buf_size, 4); |
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| 233 | break; |
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| 234 | default: |
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| 235 | av_assert0(0); |
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| 236 | } |
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| 237 | |||
| 238 | if (decoded < 0 || decoded > buf_size) |
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| 239 | goto buf_too_small; |
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| 240 | buf_size -= decoded; |
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| 241 | |||
| 242 | *got_frame = 1; |
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| 243 | |||
| 244 | return avpkt->size - buf_size; |
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| 245 | buf_too_small: |
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| 246 | av_log(avctx, AV_LOG_ERROR, "Input data too small.\n"); |
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| 247 | return AVERROR(EINVAL); |
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| 248 | } |
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| 249 | |||
| 250 | static av_cold int decode_init(AVCodecContext *avctx) |
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| 251 | { |
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| 252 | LOCOContext * const l = avctx->priv_data; |
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| 253 | int version; |
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| 254 | |||
| 255 | l->avctx = avctx; |
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| 256 | if (avctx->extradata_size < 12) { |
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| 257 | av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n", |
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| 258 | avctx->extradata_size); |
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| 259 | return AVERROR_INVALIDDATA; |
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| 260 | } |
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| 261 | version = AV_RL32(avctx->extradata); |
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| 262 | switch (version) { |
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| 263 | case 1: |
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| 264 | l->lossy = 0; |
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| 265 | break; |
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| 266 | case 2: |
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| 267 | l->lossy = AV_RL32(avctx->extradata + 8); |
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| 268 | break; |
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| 269 | default: |
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| 270 | l->lossy = AV_RL32(avctx->extradata + 8); |
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| 271 | avpriv_request_sample(avctx, "LOCO codec version %i", version); |
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| 272 | } |
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| 273 | |||
| 274 | l->mode = AV_RL32(avctx->extradata + 4); |
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| 275 | switch (l->mode) { |
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| 276 | case LOCO_CYUY2: |
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| 277 | case LOCO_YUY2: |
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| 278 | case LOCO_UYVY: |
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| 279 | avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
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| 280 | break; |
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| 281 | case LOCO_CRGB: |
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| 282 | case LOCO_RGB: |
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| 283 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
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| 284 | break; |
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| 285 | case LOCO_CYV12: |
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| 286 | case LOCO_YV12: |
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| 287 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
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| 288 | break; |
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| 289 | case LOCO_CRGBA: |
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| 290 | case LOCO_RGBA: |
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| 291 | avctx->pix_fmt = AV_PIX_FMT_BGRA; |
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| 292 | break; |
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| 293 | default: |
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| 294 | av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode); |
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| 295 | return AVERROR_INVALIDDATA; |
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| 296 | } |
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| 297 | if (avctx->debug & FF_DEBUG_PICT_INFO) |
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| 298 | av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode); |
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| 299 | |||
| 300 | return 0; |
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| 301 | } |
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| 302 | |||
| 303 | AVCodec ff_loco_decoder = { |
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| 304 | .name = "loco", |
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| 305 | .long_name = NULL_IF_CONFIG_SMALL("LOCO"), |
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| 306 | .type = AVMEDIA_TYPE_VIDEO, |
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| 307 | .id = AV_CODEC_ID_LOCO, |
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| 308 | .priv_data_size = sizeof(LOCOContext), |
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| 309 | .init = decode_init, |
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| 310 | .decode = decode_frame, |
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| 311 | .capabilities = CODEC_CAP_DR1, |
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| 312 | }; |