| 1 | /* |
| 2 | * Chronomaster DFA Video Decoder |
| 3 | * Copyright (c) 2011 Konstantin Shishkov |
| 4 | * based on work by Vladimir "VAG" Gneushev |
| 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 <inttypes.h> |
| 24 | |
| 25 | #include "avcodec.h" |
| 26 | #include "bytestream.h" |
| 27 | #include "internal.h" |
| 28 | |
| 29 | #include "libavutil/avassert.h" |
| 30 | #include "libavutil/imgutils.h" |
| 31 | #include "libavutil/mem.h" |
| 32 | |
| 33 | typedef struct DfaContext { |
| 34 | uint32_t pal[256]; |
| 35 | uint8_t *frame_buf; |
| 36 | } DfaContext; |
| 37 | |
| 38 | static av_cold int dfa_decode_init(AVCodecContext *avctx) |
| 39 | { |
| 40 | DfaContext *s = avctx->priv_data; |
| 41 | |
| 42 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| 43 | |
| 44 | if (!avctx->width || !avctx->height) |
| 45 | return AVERROR_INVALIDDATA; |
| 46 | |
| 47 | av_assert0(av_image_check_size(avctx->width, avctx->height, 0, avctx) >= 0); |
| 48 | |
| 49 | s->frame_buf = av_mallocz(avctx->width * avctx->height); |
| 50 | if (!s->frame_buf) |
| 51 | return AVERROR(ENOMEM); |
| 52 | |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static int decode_copy(GetByteContext *gb, uint8_t *frame, int width, int height) |
| 57 | { |
| 58 | const int size = width * height; |
| 59 | |
| 60 | if (bytestream2_get_buffer(gb, frame, size) != size) |
| 61 | return AVERROR_INVALIDDATA; |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static int decode_tsw1(GetByteContext *gb, uint8_t *frame, int width, int height) |
| 66 | { |
| 67 | const uint8_t *frame_start = frame; |
| 68 | const uint8_t *frame_end = frame + width * height; |
| 69 | int mask = 0x10000, bitbuf = 0; |
| 70 | int v, count, segments; |
| 71 | unsigned offset; |
| 72 | |
| 73 | segments = bytestream2_get_le32(gb); |
| 74 | offset = bytestream2_get_le32(gb); |
| 75 | if (segments == 0 && offset == frame_end - frame) |
| 76 | return 0; // skip frame |
| 77 | if (frame_end - frame <= offset) |
| 78 | return AVERROR_INVALIDDATA; |
| 79 | frame += offset; |
| 80 | while (segments--) { |
| 81 | if (bytestream2_get_bytes_left(gb) < 2) |
| 82 | return AVERROR_INVALIDDATA; |
| 83 | if (mask == 0x10000) { |
| 84 | bitbuf = bytestream2_get_le16u(gb); |
| 85 | mask = 1; |
| 86 | } |
| 87 | if (frame_end - frame < 2) |
| 88 | return AVERROR_INVALIDDATA; |
| 89 | if (bitbuf & mask) { |
| 90 | v = bytestream2_get_le16(gb); |
| 91 | offset = (v & 0x1FFF) << 1; |
| 92 | count = ((v >> 13) + 2) << 1; |
| 93 | if (frame - frame_start < offset || frame_end - frame < count) |
| 94 | return AVERROR_INVALIDDATA; |
| 95 | av_memcpy_backptr(frame, offset, count); |
| 96 | frame += count; |
| 97 | } else { |
| 98 | *frame++ = bytestream2_get_byte(gb); |
| 99 | *frame++ = bytestream2_get_byte(gb); |
| 100 | } |
| 101 | mask <<= 1; |
| 102 | } |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | static int decode_dsw1(GetByteContext *gb, uint8_t *frame, int width, int height) |
| 108 | { |
| 109 | const uint8_t *frame_start = frame; |
| 110 | const uint8_t *frame_end = frame + width * height; |
| 111 | int mask = 0x10000, bitbuf = 0; |
| 112 | int v, offset, count, segments; |
| 113 | |
| 114 | segments = bytestream2_get_le16(gb); |
| 115 | while (segments--) { |
| 116 | if (bytestream2_get_bytes_left(gb) < 2) |
| 117 | return AVERROR_INVALIDDATA; |
| 118 | if (mask == 0x10000) { |
| 119 | bitbuf = bytestream2_get_le16u(gb); |
| 120 | mask = 1; |
| 121 | } |
| 122 | if (frame_end - frame < 2) |
| 123 | return AVERROR_INVALIDDATA; |
| 124 | if (bitbuf & mask) { |
| 125 | v = bytestream2_get_le16(gb); |
| 126 | offset = (v & 0x1FFF) << 1; |
| 127 | count = ((v >> 13) + 2) << 1; |
| 128 | if (frame - frame_start < offset || frame_end - frame < count) |
| 129 | return AVERROR_INVALIDDATA; |
| 130 | av_memcpy_backptr(frame, offset, count); |
| 131 | frame += count; |
| 132 | } else if (bitbuf & (mask << 1)) { |
| 133 | frame += bytestream2_get_le16(gb); |
| 134 | } else { |
| 135 | *frame++ = bytestream2_get_byte(gb); |
| 136 | *frame++ = bytestream2_get_byte(gb); |
| 137 | } |
| 138 | mask <<= 2; |
| 139 | } |
| 140 | |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static int decode_dds1(GetByteContext *gb, uint8_t *frame, int width, int height) |
| 145 | { |
| 146 | const uint8_t *frame_start = frame; |
| 147 | const uint8_t *frame_end = frame + width * height; |
| 148 | int mask = 0x10000, bitbuf = 0; |
| 149 | int i, v, offset, count, segments; |
| 150 | |
| 151 | segments = bytestream2_get_le16(gb); |
| 152 | while (segments--) { |
| 153 | if (bytestream2_get_bytes_left(gb) < 2) |
| 154 | return AVERROR_INVALIDDATA; |
| 155 | if (mask == 0x10000) { |
| 156 | bitbuf = bytestream2_get_le16u(gb); |
| 157 | mask = 1; |
| 158 | } |
| 159 | |
| 160 | if (bitbuf & mask) { |
| 161 | v = bytestream2_get_le16(gb); |
| 162 | offset = (v & 0x1FFF) << 2; |
| 163 | count = ((v >> 13) + 2) << 1; |
| 164 | if (frame - frame_start < offset || frame_end - frame < count*2 + width) |
| 165 | return AVERROR_INVALIDDATA; |
| 166 | for (i = 0; i < count; i++) { |
| 167 | frame[0] = frame[1] = |
| 168 | frame[width] = frame[width + 1] = frame[-offset]; |
| 169 | |
| 170 | frame += 2; |
| 171 | } |
| 172 | } else if (bitbuf & (mask << 1)) { |
| 173 | v = bytestream2_get_le16(gb)*2; |
| 174 | if (frame - frame_end < v) |
| 175 | return AVERROR_INVALIDDATA; |
| 176 | frame += v; |
| 177 | } else { |
| 178 | if (frame_end - frame < width + 3) |
| 179 | return AVERROR_INVALIDDATA; |
| 180 | frame[0] = frame[1] = |
| 181 | frame[width] = frame[width + 1] = bytestream2_get_byte(gb); |
| 182 | frame += 2; |
| 183 | frame[0] = frame[1] = |
| 184 | frame[width] = frame[width + 1] = bytestream2_get_byte(gb); |
| 185 | frame += 2; |
| 186 | } |
| 187 | mask <<= 2; |
| 188 | } |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | static int decode_bdlt(GetByteContext *gb, uint8_t *frame, int width, int height) |
| 194 | { |
| 195 | uint8_t *line_ptr; |
| 196 | int count, lines, segments; |
| 197 | |
| 198 | count = bytestream2_get_le16(gb); |
| 199 | if (count >= height) |
| 200 | return AVERROR_INVALIDDATA; |
| 201 | frame += width * count; |
| 202 | lines = bytestream2_get_le16(gb); |
| 203 | if (count + lines > height) |
| 204 | return AVERROR_INVALIDDATA; |
| 205 | |
| 206 | while (lines--) { |
| 207 | if (bytestream2_get_bytes_left(gb) < 1) |
| 208 | return AVERROR_INVALIDDATA; |
| 209 | line_ptr = frame; |
| 210 | frame += width; |
| 211 | segments = bytestream2_get_byteu(gb); |
| 212 | while (segments--) { |
| 213 | if (frame - line_ptr <= bytestream2_peek_byte(gb)) |
| 214 | return AVERROR_INVALIDDATA; |
| 215 | line_ptr += bytestream2_get_byte(gb); |
| 216 | count = (int8_t)bytestream2_get_byte(gb); |
| 217 | if (count >= 0) { |
| 218 | if (frame - line_ptr < count) |
| 219 | return AVERROR_INVALIDDATA; |
| 220 | if (bytestream2_get_buffer(gb, line_ptr, count) != count) |
| 221 | return AVERROR_INVALIDDATA; |
| 222 | } else { |
| 223 | count = -count; |
| 224 | if (frame - line_ptr < count) |
| 225 | return AVERROR_INVALIDDATA; |
| 226 | memset(line_ptr, bytestream2_get_byte(gb), count); |
| 227 | } |
| 228 | line_ptr += count; |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height) |
| 236 | { |
| 237 | const uint8_t *frame_end = frame + width * height; |
| 238 | uint8_t *line_ptr; |
| 239 | int count, i, v, lines, segments; |
| 240 | int y = 0; |
| 241 | |
| 242 | lines = bytestream2_get_le16(gb); |
| 243 | if (lines > height) |
| 244 | return AVERROR_INVALIDDATA; |
| 245 | |
| 246 | while (lines--) { |
| 247 | if (bytestream2_get_bytes_left(gb) < 2) |
| 248 | return AVERROR_INVALIDDATA; |
| 249 | segments = bytestream2_get_le16u(gb); |
| 250 | while ((segments & 0xC000) == 0xC000) { |
| 251 | unsigned skip_lines = -(int16_t)segments; |
| 252 | unsigned delta = -((int16_t)segments * width); |
| 253 | if (frame_end - frame <= delta || y + lines + skip_lines > height) |
| 254 | return AVERROR_INVALIDDATA; |
| 255 | frame += delta; |
| 256 | y += skip_lines; |
| 257 | segments = bytestream2_get_le16(gb); |
| 258 | } |
| 259 | |
| 260 | if (frame_end <= frame) |
| 261 | return AVERROR_INVALIDDATA; |
| 262 | if (segments & 0x8000) { |
| 263 | frame[width - 1] = segments & 0xFF; |
| 264 | segments = bytestream2_get_le16(gb); |
| 265 | } |
| 266 | line_ptr = frame; |
| 267 | if (frame_end - frame < width) |
| 268 | return AVERROR_INVALIDDATA; |
| 269 | frame += width; |
| 270 | y++; |
| 271 | while (segments--) { |
| 272 | if (frame - line_ptr <= bytestream2_peek_byte(gb)) |
| 273 | return AVERROR_INVALIDDATA; |
| 274 | line_ptr += bytestream2_get_byte(gb); |
| 275 | count = (int8_t)bytestream2_get_byte(gb); |
| 276 | if (count >= 0) { |
| 277 | if (frame - line_ptr < count * 2) |
| 278 | return AVERROR_INVALIDDATA; |
| 279 | if (bytestream2_get_buffer(gb, line_ptr, count * 2) != count * 2) |
| 280 | return AVERROR_INVALIDDATA; |
| 281 | line_ptr += count * 2; |
| 282 | } else { |
| 283 | count = -count; |
| 284 | if (frame - line_ptr < count * 2) |
| 285 | return AVERROR_INVALIDDATA; |
| 286 | v = bytestream2_get_le16(gb); |
| 287 | for (i = 0; i < count; i++) |
| 288 | bytestream_put_le16(&line_ptr, v); |
| 289 | } |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | static int decode_tdlt(GetByteContext *gb, uint8_t *frame, int width, int height) |
| 297 | { |
| 298 | const uint8_t *frame_end = frame + width * height; |
| 299 | uint32_t segments = bytestream2_get_le32(gb); |
| 300 | int skip, copy; |
| 301 | |
| 302 | while (segments--) { |
| 303 | if (bytestream2_get_bytes_left(gb) < 2) |
| 304 | return AVERROR_INVALIDDATA; |
| 305 | copy = bytestream2_get_byteu(gb) * 2; |
| 306 | skip = bytestream2_get_byteu(gb) * 2; |
| 307 | if (frame_end - frame < copy + skip || |
| 308 | bytestream2_get_bytes_left(gb) < copy) |
| 309 | return AVERROR_INVALIDDATA; |
| 310 | frame += skip; |
| 311 | bytestream2_get_buffer(gb, frame, copy); |
| 312 | frame += copy; |
| 313 | } |
| 314 | |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | static int decode_blck(GetByteContext *gb, uint8_t *frame, int width, int height) |
| 319 | { |
| 320 | memset(frame, 0, width * height); |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | |
| 325 | typedef int (*chunk_decoder)(GetByteContext *gb, uint8_t *frame, int width, int height); |
| 326 | |
| 327 | static const chunk_decoder decoder[8] = { |
| 328 | decode_copy, decode_tsw1, decode_bdlt, decode_wdlt, |
| 329 | decode_tdlt, decode_dsw1, decode_blck, decode_dds1, |
| 330 | }; |
| 331 | |
| 332 | static const char* chunk_name[8] = { |
| 333 | "COPY", "TSW1", "BDLT", "WDLT", "TDLT", "DSW1", "BLCK", "DDS1" |
| 334 | }; |
| 335 | |
| 336 | static int dfa_decode_frame(AVCodecContext *avctx, |
| 337 | void *data, int *got_frame, |
| 338 | AVPacket *avpkt) |
| 339 | { |
| 340 | AVFrame *frame = data; |
| 341 | DfaContext *s = avctx->priv_data; |
| 342 | GetByteContext gb; |
| 343 | const uint8_t *buf = avpkt->data; |
| 344 | uint32_t chunk_type, chunk_size; |
| 345 | uint8_t *dst; |
| 346 | int ret; |
| 347 | int i, pal_elems; |
| 348 | int version = avctx->extradata_size==2 ? AV_RL16(avctx->extradata) : 0; |
| 349 | |
| 350 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 351 | return ret; |
| 352 | |
| 353 | bytestream2_init(&gb, avpkt->data, avpkt->size); |
| 354 | while (bytestream2_get_bytes_left(&gb) > 0) { |
| 355 | bytestream2_skip(&gb, 4); |
| 356 | chunk_size = bytestream2_get_le32(&gb); |
| 357 | chunk_type = bytestream2_get_le32(&gb); |
| 358 | if (!chunk_type) |
| 359 | break; |
| 360 | if (chunk_type == 1) { |
| 361 | pal_elems = FFMIN(chunk_size / 3, 256); |
| 362 | for (i = 0; i < pal_elems; i++) { |
| 363 | s->pal[i] = bytestream2_get_be24(&gb) << 2; |
| 364 | s->pal[i] |= 0xFFU << 24 | (s->pal[i] >> 6) & 0x30303; |
| 365 | } |
| 366 | frame->palette_has_changed = 1; |
| 367 | } else if (chunk_type <= 9) { |
| 368 | if (decoder[chunk_type - 2](&gb, s->frame_buf, avctx->width, avctx->height)) { |
| 369 | av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n", |
| 370 | chunk_name[chunk_type - 2]); |
| 371 | return AVERROR_INVALIDDATA; |
| 372 | } |
| 373 | } else { |
| 374 | av_log(avctx, AV_LOG_WARNING, |
| 375 | "Ignoring unknown chunk type %"PRIu32"\n", |
| 376 | chunk_type); |
| 377 | } |
| 378 | buf += chunk_size; |
| 379 | } |
| 380 | |
| 381 | buf = s->frame_buf; |
| 382 | dst = frame->data[0]; |
| 383 | for (i = 0; i < avctx->height; i++) { |
| 384 | if(version == 0x100) { |
| 385 | int j; |
| 386 | for(j = 0; j < avctx->width; j++) { |
| 387 | dst[j] = buf[ (i&3)*(avctx->width /4) + (j/4) + |
| 388 | ((j&3)*(avctx->height/4) + (i/4))*avctx->width]; |
| 389 | } |
| 390 | } else { |
| 391 | memcpy(dst, buf, avctx->width); |
| 392 | buf += avctx->width; |
| 393 | } |
| 394 | dst += frame->linesize[0]; |
| 395 | } |
| 396 | memcpy(frame->data[1], s->pal, sizeof(s->pal)); |
| 397 | |
| 398 | *got_frame = 1; |
| 399 | |
| 400 | return avpkt->size; |
| 401 | } |
| 402 | |
| 403 | static av_cold int dfa_decode_end(AVCodecContext *avctx) |
| 404 | { |
| 405 | DfaContext *s = avctx->priv_data; |
| 406 | |
| 407 | av_freep(&s->frame_buf); |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | AVCodec ff_dfa_decoder = { |
| 413 | .name = "dfa", |
| 414 | .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"), |
| 415 | .type = AVMEDIA_TYPE_VIDEO, |
| 416 | .id = AV_CODEC_ID_DFA, |
| 417 | .priv_data_size = sizeof(DfaContext), |
| 418 | .init = dfa_decode_init, |
| 419 | .close = dfa_decode_end, |
| 420 | .decode = dfa_decode_frame, |
| 421 | .capabilities = CODEC_CAP_DR1, |
| 422 | }; |