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| 1 | +/* |
| 2 | + * RemotelyAnywhere Screen Capture decoder |
| 3 | + * |
| 4 | + * Copyright (c) 2018 Paul B Mahol |
| 5 | + * |
| 6 | + * This file is part of FFmpeg. |
| 7 | + * |
| 8 | + * FFmpeg is free software; you can redistribute it and/or |
| 9 | + * modify it under the terms of the GNU Lesser General Public |
| 10 | + * License as published by the Free Software Foundation; either |
| 11 | + * version 2.1 of the License, or (at your option) any later version. |
| 12 | + * |
| 13 | + * FFmpeg is distributed in the hope that it will be useful, |
| 14 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | + * Lesser General Public License for more details. |
| 17 | + * |
| 18 | + * You should have received a copy of the GNU Lesser General Public |
| 19 | + * License along with FFmpeg; if not, write to the Free Software |
| 20 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | + */ |
| 22 | + |
| 23 | +#include <stdio.h> |
| 24 | +#include <stdlib.h> |
| 25 | +#include <string.h> |
| 26 | + |
| 27 | +#include "libavutil/avassert.h" |
| 28 | +#include "libavutil/imgutils.h" |
| 29 | +#include "libavutil/opt.h" |
| 30 | + |
| 31 | +#include "avcodec.h" |
| 32 | +#include "bytestream.h" |
| 33 | +#include "internal.h" |
| 34 | + |
| 35 | +#include <zlib.h> |
| 36 | + |
| 37 | +#define KBND MKTAG('K', 'B', 'N', 'D') |
| 38 | +#define FINT MKTAG('F', 'I', 'N', 'T') |
| 39 | +#define INIT MKTAG('I', 'N', 'I', 'T') |
| 40 | +#define BNDL MKTAG('B', 'N', 'D', 'L') |
| 41 | +#define KFRM MKTAG('K', 'F', 'R', 'M') |
| 42 | +#define DLTA MKTAG('D', 'L', 'T', 'A') |
| 43 | +#define MOUS MKTAG('M', 'O', 'U', 'S') |
| 44 | +#define MPOS MKTAG('M', 'P', 'O', 'S') |
| 45 | +#define MOVE MKTAG('M', 'O', 'V', 'E') |
| 46 | +#define EMPT MKTAG('E', 'M', 'P', 'T') |
| 47 | + |
| 48 | +typedef struct RASCContext { |
| 49 | + AVClass *class; |
| 50 | + int skip_cursor; |
| 51 | + GetByteContext gb; |
| 52 | + uint8_t *delta; |
| 53 | + int delta_size; |
| 54 | + uint8_t *cursor; |
| 55 | + int cursor_size; |
| 56 | + unsigned cursor_w; |
| 57 | + unsigned cursor_h; |
| 58 | + unsigned cursor_x; |
| 59 | + unsigned cursor_y; |
| 60 | + int stride; |
| 61 | + int bpp; |
| 62 | + z_stream zstream; |
| 63 | + AVFrame *frame; |
| 64 | + AVFrame *frame1; |
| 65 | + AVFrame *frame2; |
| 66 | +} RASCContext; |
| 67 | + |
| 68 | +static void clear_plane(AVCodecContext *avctx, AVFrame *frame) |
| 69 | +{ |
| 70 | + RASCContext *s = avctx->priv_data; |
| 71 | + uint8_t *dst = frame->data[0]; |
| 72 | + |
| 73 | + for (int y = 0; y < avctx->height; y++) { |
| 74 | + memset(dst, 0, avctx->width * s->bpp); |
| 75 | + dst += frame->linesize[0]; |
| 76 | + } |
| 77 | +} |
| 78 | + |
| 79 | +static void copy_plane(AVCodecContext *avctx, AVFrame *src, AVFrame *dst) |
| 80 | +{ |
| 81 | + RASCContext *s = avctx->priv_data; |
| 82 | + uint8_t *srcp = src->data[0]; |
| 83 | + uint8_t *dstp = dst->data[0]; |
| 84 | + |
| 85 | + for (int y = 0; y < avctx->height; y++) { |
| 86 | + memcpy(dstp, srcp, s->stride); |
| 87 | + srcp += src->linesize[0]; |
| 88 | + dstp += dst->linesize[0]; |
| 89 | + } |
| 90 | +} |
| 91 | + |
| 92 | +static int init_frames(AVCodecContext *avctx) |
| 93 | +{ |
| 94 | + RASCContext *s = avctx->priv_data; |
| 95 | + int ret; |
| 96 | + |
| 97 | + av_frame_unref(s->frame1); |
| 98 | + if ((ret = ff_get_buffer(avctx, s->frame1, 0)) < 0) |
| 99 | + return ret; |
| 100 | + |
| 101 | + av_frame_unref(s->frame2); |
| 102 | + if ((ret = ff_get_buffer(avctx, s->frame2, 0)) < 0) |
| 103 | + return ret; |
| 104 | + |
| 105 | + clear_plane(avctx, s->frame2); |
| 106 | + clear_plane(avctx, s->frame1); |
| 107 | + |
| 108 | + return 0; |
| 109 | +} |
| 110 | + |
| 111 | +static int decode_fint(AVCodecContext *avctx, |
| 112 | + AVPacket *avpkt, unsigned size) |
| 113 | +{ |
| 114 | + RASCContext *s = avctx->priv_data; |
| 115 | + GetByteContext *gb = &s->gb; |
| 116 | + unsigned w, h, fmt; |
| 117 | + int ret; |
| 118 | + |
| 119 | + if (bytestream2_peek_le32(gb) != 0x65) { |
| 120 | + if (!s->frame2->data[0] || !s->frame1->data[0]) |
| 121 | + return AVERROR_INVALIDDATA; |
| 122 | + |
| 123 | + clear_plane(avctx, s->frame2); |
| 124 | + clear_plane(avctx, s->frame1); |
| 125 | + return 0; |
| 126 | + } |
| 127 | + |
| 128 | + bytestream2_skip(gb, 8); |
| 129 | + w = bytestream2_get_le32(gb); |
| 130 | + h = bytestream2_get_le32(gb); |
| 131 | + bytestream2_skip(gb, 30); |
| 132 | + fmt = bytestream2_get_le16(gb); |
| 133 | + bytestream2_skip(gb, 24); |
| 134 | + |
| 135 | + switch (fmt) { |
| 136 | + case 8: s->stride = FFALIGN(w, 4); |
| 137 | + s->bpp = 1; |
| 138 | + fmt = AV_PIX_FMT_PAL8; break; |
| 139 | + case 16: s->stride = w * 2; |
| 140 | + s->bpp = 2; |
| 141 | + fmt = AV_PIX_FMT_RGB555LE; break; |
| 142 | + case 32: s->stride = w * 4; |
| 143 | + s->bpp = 4; |
| 144 | + fmt = AV_PIX_FMT_BGR0; break; |
| 145 | + default: return AVERROR_INVALIDDATA; |
| 146 | + } |
| 147 | + |
| 148 | + ret = ff_set_dimensions(avctx, w, h); |
| 149 | + if (ret < 0) |
| 150 | + return ret; |
| 151 | + avctx->width = w; |
| 152 | + avctx->height = h; |
| 153 | + avctx->pix_fmt = fmt; |
| 154 | + |
| 155 | + ret = init_frames(avctx); |
| 156 | + if (ret < 0) |
| 157 | + return ret; |
| 158 | + |
| 159 | + if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { |
| 160 | + uint32_t *pal = (uint32_t *)s->frame2->data[1]; |
| 161 | + |
| 162 | + for (int i = 0; i < 256; i++) |
| 163 | + pal[i] = bytestream2_get_le32(gb) | 0xFF000000u; |
| 164 | + } |
| 165 | + |
| 166 | + return 0; |
| 167 | +} |
| 168 | + |
| 169 | +static int decode_zlib(AVCodecContext *avctx, AVPacket *avpkt, |
| 170 | + unsigned size, unsigned uncompressed_size) |
| 171 | +{ |
| 172 | + RASCContext *s = avctx->priv_data; |
| 173 | + GetByteContext *gb = &s->gb; |
| 174 | + int zret; |
| 175 | + |
| 176 | + zret = inflateReset(&s->zstream); |
| 177 | + if (zret != Z_OK) { |
| 178 | + av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret); |
| 179 | + return AVERROR_EXTERNAL; |
| 180 | + } |
| 181 | + |
| 182 | + av_fast_padded_malloc(&s->delta, &s->delta_size, uncompressed_size); |
| 183 | + if (!s->delta) |
| 184 | + return AVERROR(ENOMEM); |
| 185 | + |
| 186 | + s->zstream.next_in = avpkt->data + bytestream2_tell(gb); |
| 187 | + s->zstream.avail_in = FFMIN(size, bytestream2_get_bytes_left(gb)); |
| 188 | + |
| 189 | + s->zstream.next_out = s->delta; |
| 190 | + s->zstream.avail_out = s->delta_size; |
| 191 | + |
| 192 | + zret = inflate(&s->zstream, Z_FINISH); |
| 193 | + if (zret != Z_STREAM_END) { |
| 194 | + av_log(avctx, AV_LOG_ERROR, |
| 195 | + "Inflate failed with return code: %d.\n", zret); |
| 196 | + return AVERROR_INVALIDDATA; |
| 197 | + } |
| 198 | + |
| 199 | + return 0; |
| 200 | +} |
| 201 | + |
| 202 | +static int decode_move(AVCodecContext *avctx, |
| 203 | + AVPacket *avpkt, unsigned size) |
| 204 | +{ |
| 205 | + RASCContext *s = avctx->priv_data; |
| 206 | + GetByteContext *gb = &s->gb; |
| 207 | + GetByteContext mc; |
| 208 | + unsigned pos, compression, nb_moves; |
| 209 | + unsigned uncompressed_size; |
| 210 | + int ret; |
| 211 | + |
| 212 | + pos = bytestream2_tell(gb); |
| 213 | + bytestream2_skip(gb, 8); |
| 214 | + nb_moves = bytestream2_get_le32(gb); |
| 215 | + bytestream2_skip(gb, 8); |
| 216 | + compression = bytestream2_get_le32(gb); |
| 217 | + |
| 218 | + if (nb_moves > INT32_MAX / 16) |
| 219 | + return AVERROR_INVALIDDATA; |
| 220 | + |
| 221 | + uncompressed_size = 16 * nb_moves; |
| 222 | + |
| 223 | + if (compression == 1) { |
| 224 | + ret = decode_zlib(avctx, avpkt, |
| 225 | + size - (bytestream2_tell(gb) - pos), |
| 226 | + uncompressed_size); |
| 227 | + if (ret < 0) |
| 228 | + return ret; |
| 229 | + bytestream2_init(&mc, s->delta, uncompressed_size); |
| 230 | + } else if (compression == 0) { |
| 231 | + bytestream2_init(&mc, avpkt->data + bytestream2_tell(gb), |
| 232 | + bytestream2_get_bytes_left(gb)); |
| 233 | + } else if (compression == 2) { |
| 234 | + avpriv_request_sample(avctx, "compression %d", compression); |
| 235 | + return AVERROR_PATCHWELCOME; |
| 236 | + } else { |
| 237 | + return AVERROR_INVALIDDATA; |
| 238 | + } |
| 239 | + |
| 240 | + if (bytestream2_get_bytes_left(&mc) < uncompressed_size) |
| 241 | + return AVERROR_INVALIDDATA; |
| 242 | + |
| 243 | + for (int i = 0; i < nb_moves; i++) { |
| 244 | + int type, start_x, start_y, end_x, end_y, mov_x, mov_y; |
| 245 | + uint8_t *e2, *b1, *b2; |
| 246 | + int w, h; |
| 247 | + |
| 248 | + type = bytestream2_get_le16(&mc); |
| 249 | + start_x = bytestream2_get_le16(&mc); |
| 250 | + start_y = bytestream2_get_le16(&mc); |
| 251 | + end_x = bytestream2_get_le16(&mc); |
| 252 | + end_y = bytestream2_get_le16(&mc); |
| 253 | + mov_x = bytestream2_get_le16(&mc); |
| 254 | + mov_y = bytestream2_get_le16(&mc); |
| 255 | + bytestream2_skip(&mc, 2); |
| 256 | + |
| 257 | + if (start_x >= avctx->width || start_y >= avctx->height || |
| 258 | + end_x >= avctx->width || end_y >= avctx->height || |
| 259 | + mov_x >= avctx->width || mov_y >= avctx->height) { |
| 260 | + continue; |
| 261 | + } |
| 262 | + |
| 263 | + if (start_x >= end_x || start_y >= end_y) |
| 264 | + continue; |
| 265 | + |
| 266 | + w = end_x - start_x; |
| 267 | + h = end_y - start_y; |
| 268 | + |
| 269 | + if (mov_x + w > avctx->width || mov_y + h > avctx->height) |
| 270 | + continue; |
| 271 | + |
| 272 | + if (!s->frame2->data[0] || !s->frame1->data[0]) |
| 273 | + return AVERROR_INVALIDDATA; |
| 274 | + |
| 275 | + b1 = s->frame1->data[0] + s->frame1->linesize[0] * (start_y + h) + start_x * s->bpp; |
| 276 | + b2 = s->frame2->data[0] + s->frame2->linesize[0] * (start_y + h) + start_x * s->bpp; |
| 277 | + e2 = s->frame2->data[0] + s->frame2->linesize[0] * (mov_y + h) + mov_x * s->bpp; |
| 278 | + |
| 279 | + if (type == 2) { |
| 280 | + for (int j = 0; j < h; j++) { |
| 281 | + memcpy(b1, b2, w * s->bpp); |
| 282 | + b1 -= s->frame1->linesize[0]; |
| 283 | + b2 -= s->frame2->linesize[0]; |
| 284 | + } |
| 285 | + } else if (type == 1) { |
| 286 | + for (int j = 0; j < h; j++) { |
| 287 | + memset(b2, 0, w * s->bpp); |
| 288 | + b2 -= s->frame2->linesize[0]; |
| 289 | + } |
| 290 | + } else if (type == 0) { |
| 291 | + uint8_t *buffer; |
| 292 | + |
| 293 | + av_fast_padded_malloc(&s->delta, &s->delta_size, w * h * s->bpp); |
| 294 | + buffer = s->delta; |
| 295 | + if (!buffer) |
| 296 | + return AVERROR(ENOMEM); |
| 297 | + |
| 298 | + for (int j = 0; j < h; j++) { |
| 299 | + memcpy(buffer + j * w * s->bpp, e2, w * s->bpp); |
| 300 | + e2 -= s->frame2->linesize[0]; |
| 301 | + } |
| 302 | + |
| 303 | + for (int j = 0; j < h; j++) { |
| 304 | + memcpy(b2, buffer + j * w * s->bpp, w * s->bpp); |
| 305 | + b2 -= s->frame2->linesize[0]; |
| 306 | + } |
| 307 | + } else { |
| 308 | + return AVERROR_INVALIDDATA; |
| 309 | + } |
| 310 | + } |
| 311 | + |
| 312 | + bytestream2_skip(gb, size - (bytestream2_tell(gb) - pos)); |
| 313 | + |
| 314 | + return 0; |
| 315 | +} |
| 316 | + |
| 317 | +#define NEXT_LINE \ |
| 318 | + if (cx >= w * s->bpp) { \ |
| 319 | + cx = 0; \ |
| 320 | + cy--; \ |
| 321 | + b1 -= s->frame1->linesize[0]; \ |
| 322 | + b2 -= s->frame2->linesize[0]; \ |
| 323 | + } \ |
| 324 | + len--; |
| 325 | + |
| 326 | +static int decode_dlta(AVCodecContext *avctx, |
| 327 | + AVPacket *avpkt, unsigned size) |
| 328 | +{ |
| 329 | + RASCContext *s = avctx->priv_data; |
| 330 | + GetByteContext *gb = &s->gb; |
| 331 | + GetByteContext dc; |
| 332 | + unsigned uncompressed_size, pos; |
| 333 | + unsigned x, y, w, h; |
| 334 | + int ret, cx, cy, compression; |
| 335 | + uint8_t *b1, *b2; |
| 336 | + |
| 337 | + pos = bytestream2_tell(gb); |
| 338 | + bytestream2_skip(gb, 12); |
| 339 | + uncompressed_size = bytestream2_get_le32(gb); |
| 340 | + x = bytestream2_get_le32(gb); |
| 341 | + y = bytestream2_get_le32(gb); |
| 342 | + w = bytestream2_get_le32(gb); |
| 343 | + h = bytestream2_get_le32(gb); |
| 344 | + |
| 345 | + if (x >= avctx->width || y >= avctx->height || |
| 346 | + w > avctx->width || h > avctx->height) |
| 347 | + return AVERROR_INVALIDDATA; |
| 348 | + |
| 349 | + if (x + w > avctx->width || y + h > avctx->height) |
| 350 | + return AVERROR_INVALIDDATA; |
| 351 | + |
| 352 | + bytestream2_skip(gb, 4); |
| 353 | + compression = bytestream2_get_le32(gb); |
| 354 | + |
| 355 | + if (compression == 1) { |
| 356 | + ret = decode_zlib(avctx, avpkt, size, uncompressed_size); |
| 357 | + if (ret < 0) |
| 358 | + return ret; |
| 359 | + bytestream2_init(&dc, s->delta, uncompressed_size); |
| 360 | + } else if (compression == 0) { |
| 361 | + if (bytestream2_get_bytes_left(gb) < uncompressed_size) |
| 362 | + return AVERROR_INVALIDDATA; |
| 363 | + bytestream2_init(&dc, avpkt->data + bytestream2_tell(gb), |
| 364 | + uncompressed_size); |
| 365 | + } else if (compression == 2) { |
| 366 | + avpriv_request_sample(avctx, "compression %d", compression); |
| 367 | + return AVERROR_PATCHWELCOME; |
| 368 | + } else { |
| 369 | + return AVERROR_INVALIDDATA; |
| 370 | + } |
| 371 | + |
| 372 | + if (!s->frame2->data[0] || !s->frame1->data[0]) |
| 373 | + return AVERROR_INVALIDDATA; |
| 374 | + |
| 375 | + b1 = s->frame1->data[0] + s->frame1->linesize[0] * (y + h - 1) + x * s->bpp; |
| 376 | + b2 = s->frame2->data[0] + s->frame2->linesize[0] * (y + h - 1) + x * s->bpp; |
| 377 | + cx = 0, cy = h; |
| 378 | + while (bytestream2_get_bytes_left(&dc) > 0) { |
| 379 | + int type = bytestream2_get_byte(&dc); |
| 380 | + int len = bytestream2_get_byte(&dc); |
| 381 | + unsigned fill; |
| 382 | + |
| 383 | + switch (type) { |
| 384 | + case 1: |
| 385 | + while (len > 0 && cy > 0) { |
| 386 | + cx++; |
| 387 | + NEXT_LINE |
| 388 | + } |
| 389 | + break; |
| 390 | + case 2: |
| 391 | + while (len > 0 && cy > 0) { |
| 392 | + int v0 = b1[cx]; |
| 393 | + int v1 = b2[cx]; |
| 394 | + |
| 395 | + b2[cx] = v0; |
| 396 | + b1[cx] = v1; |
| 397 | + cx++; |
| 398 | + NEXT_LINE |
| 399 | + } |
| 400 | + break; |
| 401 | + case 3: |
| 402 | + while (len > 0 && cy > 0) { |
| 403 | + fill = bytestream2_get_byte(&dc); |
| 404 | + b1[cx] = b2[cx]; |
| 405 | + b2[cx] = fill; |
| 406 | + cx++; |
| 407 | + NEXT_LINE |
| 408 | + } |
| 409 | + break; |
| 410 | + case 4: |
| 411 | + fill = bytestream2_get_byte(&dc); |
| 412 | + while (len > 0 && cy > 0) { |
| 413 | + AV_WL32(b1 + cx, AV_RL32(b2 + cx)); |
| 414 | + AV_WL32(b2 + cx, fill); |
| 415 | + cx++; |
| 416 | + NEXT_LINE |
| 417 | + } |
| 418 | + break; |
| 419 | + case 7: |
| 420 | + fill = bytestream2_get_le32(&dc); |
| 421 | + while (len > 0 && cy > 0) { |
| 422 | + AV_WL32(b1 + cx, AV_RL32(b2 + cx)); |
| 423 | + AV_WL32(b2 + cx, fill); |
| 424 | + cx += 4; |
| 425 | + NEXT_LINE |
| 426 | + } |
| 427 | + break; |
| 428 | + case 10: |
| 429 | + while (len > 0 && cy > 0) { |
| 430 | + cx += 4; |
| 431 | + NEXT_LINE |
| 432 | + } |
| 433 | + break; |
| 434 | + case 12: |
| 435 | + while (len > 0 && cy > 0) { |
| 436 | + unsigned v0, v1; |
| 437 | + |
| 438 | + v0 = AV_RL32(b2 + cx); |
| 439 | + v1 = AV_RL32(b1 + cx); |
| 440 | + AV_WL32(b2 + cx, v1); |
| 441 | + AV_WL32(b1 + cx, v0); |
| 442 | + cx += 4; |
| 443 | + NEXT_LINE |
| 444 | + } |
| 445 | + break; |
| 446 | + case 13: |
| 447 | + while (len > 0 && cy > 0) { |
| 448 | + fill = bytestream2_get_le32(&dc); |
| 449 | + AV_WL32(b1 + cx, AV_RL32(b2 + cx)); |
| 450 | + AV_WL32(b2 + cx, fill); |
| 451 | + cx += 4; |
| 452 | + NEXT_LINE |
| 453 | + } |
| 454 | + break; |
| 455 | + default: |
| 456 | + avpriv_request_sample(avctx, "runlen %d", type); |
| 457 | + return AVERROR_INVALIDDATA; |
| 458 | + } |
| 459 | + } |
| 460 | + |
| 461 | + bytestream2_skip(gb, size - (bytestream2_tell(gb) - pos)); |
| 462 | + |
| 463 | + return 0; |
| 464 | +} |
| 465 | + |
| 466 | +static int decode_kfrm(AVCodecContext *avctx, |
| 467 | + AVPacket *avpkt, unsigned size) |
| 468 | +{ |
| 469 | + RASCContext *s = avctx->priv_data; |
| 470 | + GetByteContext *gb = &s->gb; |
| 471 | + uint8_t *dst; |
| 472 | + unsigned pos; |
| 473 | + int zret, ret; |
| 474 | + |
| 475 | + pos = bytestream2_tell(gb); |
| 476 | + if (bytestream2_peek_le32(gb) == 0x65) { |
| 477 | + ret = decode_fint(avctx, avpkt, size); |
| 478 | + if (ret < 0) |
| 479 | + return ret; |
| 480 | + } |
| 481 | + |
| 482 | + if (!s->frame2->data[0]) |
| 483 | + return AVERROR_INVALIDDATA; |
| 484 | + |
| 485 | + zret = inflateReset(&s->zstream); |
| 486 | + if (zret != Z_OK) { |
| 487 | + av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret); |
| 488 | + return AVERROR_EXTERNAL; |
| 489 | + } |
| 490 | + |
| 491 | + s->zstream.next_in = avpkt->data + bytestream2_tell(gb); |
| 492 | + s->zstream.avail_in = bytestream2_get_bytes_left(gb); |
| 493 | + |
| 494 | + dst = s->frame2->data[0] + (avctx->height - 1) * s->frame2->linesize[0]; |
| 495 | + for (int i = 0; i < avctx->height; i++) { |
| 496 | + s->zstream.next_out = dst; |
| 497 | + s->zstream.avail_out = s->stride; |
| 498 | + |
| 499 | + zret = inflate(&s->zstream, Z_SYNC_FLUSH); |
| 500 | + if (zret != Z_OK && zret != Z_STREAM_END) { |
| 501 | + av_log(avctx, AV_LOG_ERROR, |
| 502 | + "Inflate failed with return code: %d.\n", zret); |
| 503 | + return AVERROR_INVALIDDATA; |
| 504 | + } |
| 505 | + |
| 506 | + dst -= s->frame2->linesize[0]; |
| 507 | + } |
| 508 | + |
| 509 | + dst = s->frame1->data[0] + (avctx->height - 1) * s->frame1->linesize[0]; |
| 510 | + for (int i = 0; i < avctx->height; i++) { |
| 511 | + s->zstream.next_out = dst; |
| 512 | + s->zstream.avail_out = s->stride; |
| 513 | + |
| 514 | + zret = inflate(&s->zstream, Z_SYNC_FLUSH); |
| 515 | + if (zret != Z_OK && zret != Z_STREAM_END) { |
| 516 | + av_log(avctx, AV_LOG_ERROR, |
| 517 | + "Inflate failed with return code: %d.\n", zret); |
| 518 | + return AVERROR_INVALIDDATA; |
| 519 | + } |
| 520 | + |
| 521 | + dst -= s->frame1->linesize[0]; |
| 522 | + } |
| 523 | + |
| 524 | + bytestream2_skip(gb, size - (bytestream2_tell(gb) - pos)); |
| 525 | + |
| 526 | + return 0; |
| 527 | +} |
| 528 | + |
| 529 | +static int decode_mous(AVCodecContext *avctx, |
| 530 | + AVPacket *avpkt, unsigned size) |
| 531 | +{ |
| 532 | + RASCContext *s = avctx->priv_data; |
| 533 | + GetByteContext *gb = &s->gb; |
| 534 | + unsigned w, h, pos, uncompressed_size; |
| 535 | + int ret; |
| 536 | + |
| 537 | + pos = bytestream2_tell(gb); |
| 538 | + bytestream2_skip(gb, 8); |
| 539 | + w = bytestream2_get_le32(gb); |
| 540 | + h = bytestream2_get_le32(gb); |
| 541 | + bytestream2_skip(gb, 12); |
| 542 | + uncompressed_size = bytestream2_get_le32(gb); |
| 543 | + |
| 544 | + if (w > avctx->width || h > avctx->height) |
| 545 | + return AVERROR_INVALIDDATA; |
| 546 | + |
| 547 | + if (uncompressed_size != 3 * w * h) |
| 548 | + return AVERROR_INVALIDDATA; |
| 549 | + |
| 550 | + av_fast_padded_malloc(&s->cursor, &s->cursor_size, uncompressed_size); |
| 551 | + if (!s->cursor) |
| 552 | + return AVERROR(ENOMEM); |
| 553 | + |
| 554 | + ret = decode_zlib(avctx, avpkt, |
| 555 | + size - (bytestream2_tell(gb) - pos), |
| 556 | + uncompressed_size); |
| 557 | + if (ret < 0) |
| 558 | + return ret; |
| 559 | + memcpy(s->cursor, s->delta, uncompressed_size); |
| 560 | + |
| 561 | + bytestream2_skip(gb, size - (bytestream2_tell(gb) - pos)); |
| 562 | + |
| 563 | + s->cursor_w = w; |
| 564 | + s->cursor_h = h; |
| 565 | + |
| 566 | + return 0; |
| 567 | +} |
| 568 | + |
| 569 | +static int decode_mpos(AVCodecContext *avctx, |
| 570 | + AVPacket *avpkt, unsigned size) |
| 571 | +{ |
| 572 | + RASCContext *s = avctx->priv_data; |
| 573 | + GetByteContext *gb = &s->gb; |
| 574 | + unsigned pos; |
| 575 | + |
| 576 | + pos = bytestream2_tell(gb); |
| 577 | + bytestream2_skip(gb, 8); |
| 578 | + s->cursor_x = bytestream2_get_le32(gb); |
| 579 | + s->cursor_y = bytestream2_get_le32(gb); |
| 580 | + |
| 581 | + bytestream2_skip(gb, size - (bytestream2_tell(gb) - pos)); |
| 582 | + |
| 583 | + return 0; |
| 584 | +} |
| 585 | + |
| 586 | +static void draw_cursor(AVCodecContext *avctx) |
| 587 | +{ |
| 588 | + RASCContext *s = avctx->priv_data; |
| 589 | + uint8_t *dst, *pal; |
| 590 | + |
| 591 | + if (!s->cursor) |
| 592 | + return; |
| 593 | + |
| 594 | + if (s->cursor_x >= avctx->width || s->cursor_y >= avctx->height) |
| 595 | + return; |
| 596 | + |
| 597 | + if (s->cursor_x + s->cursor_w > avctx->width || |
| 598 | + s->cursor_y + s->cursor_h > avctx->height) |
| 599 | + return; |
| 600 | + |
| 601 | + if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { |
| 602 | + pal = s->frame->data[1]; |
| 603 | + for (int i = 0; i < s->cursor_h; i++) { |
| 604 | + for (int j = 0; j < s->cursor_w; j++) { |
| 605 | + int cr = s->cursor[3 * s->cursor_w * (s->cursor_h - i - 1) + 3 * j + 0]; |
| 606 | + int cg = s->cursor[3 * s->cursor_w * (s->cursor_h - i - 1) + 3 * j + 1]; |
| 607 | + int cb = s->cursor[3 * s->cursor_w * (s->cursor_h - i - 1) + 3 * j + 2]; |
| 608 | + int best = INT_MAX; |
| 609 | + int index = 0; |
| 610 | + int dist; |
| 611 | + |
| 612 | + if (cr == s->cursor[0] && cg == s->cursor[1] && cb == s->cursor[2]) |
| 613 | + continue; |
| 614 | + |
| 615 | + dst = s->frame->data[0] + s->frame->linesize[0] * (s->cursor_y + i) + (s->cursor_x + j); |
| 616 | + for (int k = 0; k < 256; k++) { |
| 617 | + int pr = pal[k * 4 + 0]; |
| 618 | + int pg = pal[k * 4 + 1]; |
| 619 | + int pb = pal[k * 4 + 2]; |
| 620 | + |
| 621 | + dist = FFABS(cr - pr) + FFABS(cg - pg) + FFABS(cb - pb); |
| 622 | + if (dist < best) { |
| 623 | + best = dist; |
| 624 | + index = k; |
| 625 | + } |
| 626 | + } |
| 627 | + dst[0] = index; |
| 628 | + } |
| 629 | + } |
| 630 | + } else if (avctx->pix_fmt == AV_PIX_FMT_RGB555LE) { |
| 631 | + for (int i = 0; i < s->cursor_h; i++) { |
| 632 | + for (int j = 0; j < s->cursor_w; j++) { |
| 633 | + int cr = s->cursor[3 * s->cursor_w * (s->cursor_h - i - 1) + 3 * j + 0]; |
| 634 | + int cg = s->cursor[3 * s->cursor_w * (s->cursor_h - i - 1) + 3 * j + 1]; |
| 635 | + int cb = s->cursor[3 * s->cursor_w * (s->cursor_h - i - 1) + 3 * j + 2]; |
| 636 | + |
| 637 | + if (cr == s->cursor[0] && cg == s->cursor[1] && cb == s->cursor[2]) |
| 638 | + continue; |
| 639 | + |
| 640 | + cr >>= 3; cg >>=3; cb >>= 3; |
| 641 | + dst = s->frame->data[0] + s->frame->linesize[0] * (s->cursor_y + i) + 2 * (s->cursor_x + j); |
| 642 | + AV_WL16(dst, cr | cg << 5 | cb << 10); |
| 643 | + } |
| 644 | + } |
| 645 | + } else if (avctx->pix_fmt == AV_PIX_FMT_BGR0) { |
| 646 | + for (int i = 0; i < s->cursor_h; i++) { |
| 647 | + for (int j = 0; j < s->cursor_w; j++) { |
| 648 | + int cr = s->cursor[3 * s->cursor_w * (s->cursor_h - i - 1) + 3 * j + 0]; |
| 649 | + int cg = s->cursor[3 * s->cursor_w * (s->cursor_h - i - 1) + 3 * j + 1]; |
| 650 | + int cb = s->cursor[3 * s->cursor_w * (s->cursor_h - i - 1) + 3 * j + 2]; |
| 651 | + |
| 652 | + if (cr == s->cursor[0] && cg == s->cursor[1] && cb == s->cursor[2]) |
| 653 | + continue; |
| 654 | + |
| 655 | + dst = s->frame->data[0] + s->frame->linesize[0] * (s->cursor_y + i) + 4 * (s->cursor_x + j); |
| 656 | + dst[0] = cb; |
| 657 | + dst[1] = cg; |
| 658 | + dst[2] = cr; |
| 659 | + } |
| 660 | + } |
| 661 | + } |
| 662 | +} |
| 663 | + |
| 664 | +static int decode_frame(AVCodecContext *avctx, |
| 665 | + void *data, int *got_frame, |
| 666 | + AVPacket *avpkt) |
| 667 | +{ |
| 668 | + RASCContext *s = avctx->priv_data; |
| 669 | + GetByteContext *gb = &s->gb; |
| 670 | + int ret, intra = 0; |
| 671 | + AVFrame *frame = data; |
| 672 | + |
| 673 | + bytestream2_init(gb, avpkt->data, avpkt->size); |
| 674 | + |
| 675 | + if (bytestream2_peek_le32(gb) == EMPT) |
| 676 | + return avpkt->size; |
| 677 | + |
| 678 | + s->frame = frame; |
| 679 | + |
| 680 | + while (bytestream2_get_bytes_left(gb) > 0) { |
| 681 | + unsigned type, size = 0; |
| 682 | + |
| 683 | + type = bytestream2_get_le32(gb); |
| 684 | + if (type == KBND || type == BNDL) { |
| 685 | + intra = type == KBND; |
| 686 | + type = bytestream2_get_le32(gb); |
| 687 | + } |
| 688 | + |
| 689 | + size = bytestream2_get_le32(gb); |
| 690 | + if (bytestream2_get_bytes_left(gb) < size) |
| 691 | + return AVERROR_INVALIDDATA; |
| 692 | + |
| 693 | + switch (type) { |
| 694 | + case FINT: |
| 695 | + case INIT: |
| 696 | + ret = decode_fint(avctx, avpkt, size); |
| 697 | + break; |
| 698 | + case KFRM: |
| 699 | + ret = decode_kfrm(avctx, avpkt, size); |
| 700 | + break; |
| 701 | + case DLTA: |
| 702 | + ret = decode_dlta(avctx, avpkt, size); |
| 703 | + break; |
| 704 | + case MOVE: |
| 705 | + ret = decode_move(avctx, avpkt, size); |
| 706 | + break; |
| 707 | + case MOUS: |
| 708 | + ret = decode_mous(avctx, avpkt, size); |
| 709 | + break; |
| 710 | + case MPOS: |
| 711 | + ret = decode_mpos(avctx, avpkt, size); |
| 712 | + break; |
| 713 | + default: |
| 714 | + bytestream2_skip(gb, size); |
| 715 | + } |
| 716 | + |
| 717 | + if (ret < 0) |
| 718 | + return ret; |
| 719 | + } |
| 720 | + |
| 721 | + if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0) |
| 722 | + return ret; |
| 723 | + |
| 724 | + if (!s->frame2->data[0] || !s->frame1->data[0]) |
| 725 | + return AVERROR_INVALIDDATA; |
| 726 | + |
| 727 | + copy_plane(avctx, s->frame2, s->frame); |
| 728 | + if (avctx->pix_fmt == AV_PIX_FMT_PAL8) |
| 729 | + memcpy(s->frame->data[1], s->frame2->data[1], 1024); |
| 730 | + if (!s->skip_cursor) |
| 731 | + draw_cursor(avctx); |
| 732 | + |
| 733 | + s->frame->key_frame = intra; |
| 734 | + s->frame->pict_type = intra ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
| 735 | + |
| 736 | + *got_frame = 1; |
| 737 | + |
| 738 | + return avpkt->size; |
| 739 | +} |
| 740 | + |
| 741 | +static av_cold int decode_init(AVCodecContext *avctx) |
| 742 | +{ |
| 743 | + RASCContext *s = avctx->priv_data; |
| 744 | + int zret; |
| 745 | + |
| 746 | + s->zstream.zalloc = Z_NULL; |
| 747 | + s->zstream.zfree = Z_NULL; |
| 748 | + s->zstream.opaque = Z_NULL; |
| 749 | + zret = inflateInit(&s->zstream); |
| 750 | + if (zret != Z_OK) { |
| 751 | + av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); |
| 752 | + return AVERROR_EXTERNAL; |
| 753 | + } |
| 754 | + |
| 755 | + s->frame1 = av_frame_alloc(); |
| 756 | + s->frame2 = av_frame_alloc(); |
| 757 | + if (!s->frame1 || !s->frame2) |
| 758 | + return AVERROR(ENOMEM); |
| 759 | + |
| 760 | + return 0; |
| 761 | +} |
| 762 | + |
| 763 | +static av_cold int decode_close(AVCodecContext *avctx) |
| 764 | +{ |
| 765 | + RASCContext *s = avctx->priv_data; |
| 766 | + |
| 767 | + av_freep(&s->cursor); |
| 768 | + s->cursor_size = 0; |
| 769 | + av_freep(&s->delta); |
| 770 | + s->delta_size = 0; |
| 771 | + av_frame_free(&s->frame1); |
| 772 | + av_frame_free(&s->frame2); |
| 773 | + inflateEnd(&s->zstream); |
| 774 | + |
| 775 | + return 0; |
| 776 | +} |
| 777 | + |
| 778 | +static void decode_flush(AVCodecContext *avctx) |
| 779 | +{ |
| 780 | + RASCContext *s = avctx->priv_data; |
| 781 | + |
| 782 | + clear_plane(avctx, s->frame1); |
| 783 | + clear_plane(avctx, s->frame2); |
| 784 | +} |
| 785 | + |
| 786 | +static const AVOption options[] = { |
| 787 | +{ "skip_cursor", "skip the cursor", offsetof(RASCContext, skip_cursor), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM }, |
| 788 | +{ NULL }, |
| 789 | +}; |
| 790 | + |
| 791 | +static const AVClass rasc_decoder_class = { |
| 792 | + .class_name = "rasc decoder", |
| 793 | + .item_name = av_default_item_name, |
| 794 | + .option = options, |
| 795 | + .version = LIBAVUTIL_VERSION_INT, |
| 796 | +}; |
| 797 | + |
| 798 | +AVCodec ff_rasc_decoder = { |
| 799 | + .name = "rasc", |
| 800 | + .long_name = NULL_IF_CONFIG_SMALL("RemotelyAnywhere Screen Capture"), |
| 801 | + .type = AVMEDIA_TYPE_VIDEO, |
| 802 | + .id = AV_CODEC_ID_RASC, |
| 803 | + .priv_data_size = sizeof(RASCContext), |
| 804 | + .init = decode_init, |
| 805 | + .close = decode_close, |
| 806 | + .decode = decode_frame, |
| 807 | + .flush = decode_flush, |
| 808 | + .capabilities = AV_CODEC_CAP_DR1, |
| 809 | + .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | |
| 810 | + FF_CODEC_CAP_INIT_CLEANUP, |
| 811 | + .priv_class = &rasc_decoder_class, |
| 812 | +}; |