| 1 | /* |
| 2 | * LOCO codec |
| 3 | * Copyright (c) 2005 Konstantin Shishkov |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * LOCO codec. |
| 25 | */ |
| 26 | |
| 27 | #include "avcodec.h" |
| 28 | #include "get_bits.h" |
| 29 | #include "golomb.h" |
| 30 | #include "internal.h" |
| 31 | #include "mathops.h" |
| 32 | |
| 33 | enum LOCO_MODE { |
| 34 | LOCO_UNKN = 0, |
| 35 | LOCO_CYUY2 = -1, |
| 36 | LOCO_CRGB = -2, |
| 37 | LOCO_CRGBA = -3, |
| 38 | LOCO_CYV12 = -4, |
| 39 | LOCO_YUY2 = 1, |
| 40 | LOCO_UYVY = 2, |
| 41 | LOCO_RGB = 3, |
| 42 | LOCO_RGBA = 4, |
| 43 | LOCO_YV12 = 5, |
| 44 | }; |
| 45 | |
| 46 | typedef struct LOCOContext { |
| 47 | AVCodecContext *avctx; |
| 48 | int lossy; |
| 49 | int mode; |
| 50 | } LOCOContext; |
| 51 | |
| 52 | typedef struct RICEContext { |
| 53 | GetBitContext gb; |
| 54 | int save, run, run2; /* internal rice decoder state */ |
| 55 | int sum, count; /* sum and count for getting rice parameter */ |
| 56 | int lossy; |
| 57 | } RICEContext; |
| 58 | |
| 59 | static int loco_get_rice_param(RICEContext *r) |
| 60 | { |
| 61 | int cnt = 0; |
| 62 | int val = r->count; |
| 63 | |
| 64 | while (r->sum > val && cnt < 9) { |
| 65 | val <<= 1; |
| 66 | cnt++; |
| 67 | } |
| 68 | |
| 69 | return cnt; |
| 70 | } |
| 71 | |
| 72 | static inline void loco_update_rice_param(RICEContext *r, int val) |
| 73 | { |
| 74 | r->sum += val; |
| 75 | r->count++; |
| 76 | |
| 77 | if (r->count == 16) { |
| 78 | r->sum >>= 1; |
| 79 | r->count >>= 1; |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | static inline int loco_get_rice(RICEContext *r) |
| 84 | { |
| 85 | int v; |
| 86 | if (r->run > 0) { /* we have zero run */ |
| 87 | r->run--; |
| 88 | loco_update_rice_param(r, 0); |
| 89 | return 0; |
| 90 | } |
| 91 | v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0); |
| 92 | loco_update_rice_param(r, (v + 1) >> 1); |
| 93 | if (!v) { |
| 94 | if (r->save >= 0) { |
| 95 | r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0); |
| 96 | if (r->run > 1) |
| 97 | r->save += r->run + 1; |
| 98 | else |
| 99 | r->save -= 3; |
| 100 | } else |
| 101 | r->run2++; |
| 102 | } else { |
| 103 | v = ((v >> 1) + r->lossy) ^ -(v & 1); |
| 104 | if (r->run2 > 0) { |
| 105 | if (r->run2 > 2) |
| 106 | r->save += r->run2; |
| 107 | else |
| 108 | r->save -= 3; |
| 109 | r->run2 = 0; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | return v; |
| 114 | } |
| 115 | |
| 116 | /* LOCO main predictor - LOCO-I/JPEG-LS predictor */ |
| 117 | static inline int loco_predict(uint8_t* data, int stride, int step) |
| 118 | { |
| 119 | int a, b, c; |
| 120 | |
| 121 | a = data[-stride]; |
| 122 | b = data[-step]; |
| 123 | c = data[-stride - step]; |
| 124 | |
| 125 | return mid_pred(a, a + b - c, b); |
| 126 | } |
| 127 | |
| 128 | static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height, |
| 129 | int stride, const uint8_t *buf, int buf_size, int step) |
| 130 | { |
| 131 | RICEContext rc; |
| 132 | int val; |
| 133 | int i, j; |
| 134 | |
| 135 | if(buf_size<=0) |
| 136 | return -1; |
| 137 | |
| 138 | init_get_bits8(&rc.gb, buf, buf_size); |
| 139 | rc.save = 0; |
| 140 | rc.run = 0; |
| 141 | rc.run2 = 0; |
| 142 | rc.lossy = l->lossy; |
| 143 | |
| 144 | rc.sum = 8; |
| 145 | rc.count = 1; |
| 146 | |
| 147 | /* restore top left pixel */ |
| 148 | val = loco_get_rice(&rc); |
| 149 | data[0] = 128 + val; |
| 150 | /* restore top line */ |
| 151 | for (i = 1; i < width; i++) { |
| 152 | val = loco_get_rice(&rc); |
| 153 | data[i * step] = data[i * step - step] + val; |
| 154 | } |
| 155 | data += stride; |
| 156 | for (j = 1; j < height; j++) { |
| 157 | /* restore left column */ |
| 158 | val = loco_get_rice(&rc); |
| 159 | data[0] = data[-stride] + val; |
| 160 | /* restore all other pixels */ |
| 161 | for (i = 1; i < width; i++) { |
| 162 | val = loco_get_rice(&rc); |
| 163 | data[i * step] = loco_predict(&data[i * step], stride, step) + val; |
| 164 | } |
| 165 | data += stride; |
| 166 | } |
| 167 | |
| 168 | return (get_bits_count(&rc.gb) + 7) >> 3; |
| 169 | } |
| 170 | |
| 171 | static int decode_frame(AVCodecContext *avctx, |
| 172 | void *data, int *got_frame, |
| 173 | AVPacket *avpkt) |
| 174 | { |
| 175 | LOCOContext * const l = avctx->priv_data; |
| 176 | const uint8_t *buf = avpkt->data; |
| 177 | int buf_size = avpkt->size; |
| 178 | AVFrame * const p = data; |
| 179 | int decoded, ret; |
| 180 | |
| 181 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| 182 | return ret; |
| 183 | p->key_frame = 1; |
| 184 | |
| 185 | #define ADVANCE_BY_DECODED do { \ |
| 186 | if (decoded < 0 || decoded >= buf_size) goto buf_too_small; \ |
| 187 | buf += decoded; buf_size -= decoded; \ |
| 188 | } while(0) |
| 189 | switch(l->mode) { |
| 190 | case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY: |
| 191 | decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height, |
| 192 | p->linesize[0], buf, buf_size, 1); |
| 193 | ADVANCE_BY_DECODED; |
| 194 | decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height, |
| 195 | p->linesize[1], buf, buf_size, 1); |
| 196 | ADVANCE_BY_DECODED; |
| 197 | decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height, |
| 198 | p->linesize[2], buf, buf_size, 1); |
| 199 | break; |
| 200 | case LOCO_CYV12: case LOCO_YV12: |
| 201 | decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height, |
| 202 | p->linesize[0], buf, buf_size, 1); |
| 203 | ADVANCE_BY_DECODED; |
| 204 | decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2, |
| 205 | p->linesize[2], buf, buf_size, 1); |
| 206 | ADVANCE_BY_DECODED; |
| 207 | decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2, |
| 208 | p->linesize[1], buf, buf_size, 1); |
| 209 | break; |
| 210 | case LOCO_CRGB: case LOCO_RGB: |
| 211 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, |
| 212 | -p->linesize[0], buf, buf_size, 3); |
| 213 | ADVANCE_BY_DECODED; |
| 214 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height, |
| 215 | -p->linesize[0], buf, buf_size, 3); |
| 216 | ADVANCE_BY_DECODED; |
| 217 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height, |
| 218 | -p->linesize[0], buf, buf_size, 3); |
| 219 | break; |
| 220 | case LOCO_CRGBA: |
| 221 | case LOCO_RGBA: |
| 222 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, |
| 223 | -p->linesize[0], buf, buf_size, 4); |
| 224 | ADVANCE_BY_DECODED; |
| 225 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height, |
| 226 | -p->linesize[0], buf, buf_size, 4); |
| 227 | ADVANCE_BY_DECODED; |
| 228 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height, |
| 229 | -p->linesize[0], buf, buf_size, 4); |
| 230 | ADVANCE_BY_DECODED; |
| 231 | decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 3, avctx->width, avctx->height, |
| 232 | -p->linesize[0], buf, buf_size, 4); |
| 233 | break; |
| 234 | default: |
| 235 | av_assert0(0); |
| 236 | } |
| 237 | |
| 238 | if (decoded < 0 || decoded > buf_size) |
| 239 | goto buf_too_small; |
| 240 | buf_size -= decoded; |
| 241 | |
| 242 | *got_frame = 1; |
| 243 | |
| 244 | return avpkt->size - buf_size; |
| 245 | buf_too_small: |
| 246 | av_log(avctx, AV_LOG_ERROR, "Input data too small.\n"); |
| 247 | return AVERROR(EINVAL); |
| 248 | } |
| 249 | |
| 250 | static av_cold int decode_init(AVCodecContext *avctx) |
| 251 | { |
| 252 | LOCOContext * const l = avctx->priv_data; |
| 253 | int version; |
| 254 | |
| 255 | l->avctx = avctx; |
| 256 | if (avctx->extradata_size < 12) { |
| 257 | av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n", |
| 258 | avctx->extradata_size); |
| 259 | return AVERROR_INVALIDDATA; |
| 260 | } |
| 261 | version = AV_RL32(avctx->extradata); |
| 262 | switch (version) { |
| 263 | case 1: |
| 264 | l->lossy = 0; |
| 265 | break; |
| 266 | case 2: |
| 267 | l->lossy = AV_RL32(avctx->extradata + 8); |
| 268 | break; |
| 269 | default: |
| 270 | l->lossy = AV_RL32(avctx->extradata + 8); |
| 271 | avpriv_request_sample(avctx, "LOCO codec version %i", version); |
| 272 | } |
| 273 | |
| 274 | l->mode = AV_RL32(avctx->extradata + 4); |
| 275 | switch (l->mode) { |
| 276 | case LOCO_CYUY2: |
| 277 | case LOCO_YUY2: |
| 278 | case LOCO_UYVY: |
| 279 | avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
| 280 | break; |
| 281 | case LOCO_CRGB: |
| 282 | case LOCO_RGB: |
| 283 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
| 284 | break; |
| 285 | case LOCO_CYV12: |
| 286 | case LOCO_YV12: |
| 287 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 288 | break; |
| 289 | case LOCO_CRGBA: |
| 290 | case LOCO_RGBA: |
| 291 | avctx->pix_fmt = AV_PIX_FMT_BGRA; |
| 292 | break; |
| 293 | default: |
| 294 | av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode); |
| 295 | return AVERROR_INVALIDDATA; |
| 296 | } |
| 297 | if (avctx->debug & FF_DEBUG_PICT_INFO) |
| 298 | av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode); |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | AVCodec ff_loco_decoder = { |
| 304 | .name = "loco", |
| 305 | .long_name = NULL_IF_CONFIG_SMALL("LOCO"), |
| 306 | .type = AVMEDIA_TYPE_VIDEO, |
| 307 | .id = AV_CODEC_ID_LOCO, |
| 308 | .priv_data_size = sizeof(LOCOContext), |
| 309 | .init = decode_init, |
| 310 | .decode = decode_frame, |
| 311 | .capabilities = CODEC_CAP_DR1, |
| 312 | }; |