| 1 | /* |
| 2 | * Packed Animation File video decoder |
| 3 | * Copyright (c) 2012 Paul B Mahol |
| 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 | #include "libavutil/imgutils.h" |
| 23 | |
| 24 | #include "avcodec.h" |
| 25 | #include "bytestream.h" |
| 26 | #include "copy_block.h" |
| 27 | #include "internal.h" |
| 28 | |
| 29 | |
| 30 | static const uint8_t block_sequences[16][8] = { |
| 31 | { 0, 0, 0, 0, 0, 0, 0, 0 }, |
| 32 | { 2, 0, 0, 0, 0, 0, 0, 0 }, |
| 33 | { 5, 7, 0, 0, 0, 0, 0, 0 }, |
| 34 | { 5, 0, 0, 0, 0, 0, 0, 0 }, |
| 35 | { 6, 0, 0, 0, 0, 0, 0, 0 }, |
| 36 | { 5, 7, 5, 7, 0, 0, 0, 0 }, |
| 37 | { 5, 7, 5, 0, 0, 0, 0, 0 }, |
| 38 | { 5, 7, 6, 0, 0, 0, 0, 0 }, |
| 39 | { 5, 5, 0, 0, 0, 0, 0, 0 }, |
| 40 | { 3, 0, 0, 0, 0, 0, 0, 0 }, |
| 41 | { 6, 6, 0, 0, 0, 0, 0, 0 }, |
| 42 | { 2, 4, 0, 0, 0, 0, 0, 0 }, |
| 43 | { 2, 4, 5, 7, 0, 0, 0, 0 }, |
| 44 | { 2, 4, 5, 0, 0, 0, 0, 0 }, |
| 45 | { 2, 4, 6, 0, 0, 0, 0, 0 }, |
| 46 | { 2, 4, 5, 7, 5, 7, 0, 0 }, |
| 47 | }; |
| 48 | |
| 49 | typedef struct PAFVideoDecContext { |
| 50 | AVFrame *pic; |
| 51 | GetByteContext gb; |
| 52 | |
| 53 | int width; |
| 54 | int height; |
| 55 | |
| 56 | int current_frame; |
| 57 | uint8_t *frame[4]; |
| 58 | int frame_size; |
| 59 | int video_size; |
| 60 | |
| 61 | uint8_t *opcodes; |
| 62 | } PAFVideoDecContext; |
| 63 | |
| 64 | static av_cold int paf_video_close(AVCodecContext *avctx) |
| 65 | { |
| 66 | PAFVideoDecContext *c = avctx->priv_data; |
| 67 | int i; |
| 68 | |
| 69 | av_frame_free(&c->pic); |
| 70 | |
| 71 | for (i = 0; i < 4; i++) |
| 72 | av_freep(&c->frame[i]); |
| 73 | |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | static av_cold int paf_video_init(AVCodecContext *avctx) |
| 78 | { |
| 79 | PAFVideoDecContext *c = avctx->priv_data; |
| 80 | int i; |
| 81 | |
| 82 | c->width = avctx->width; |
| 83 | c->height = avctx->height; |
| 84 | |
| 85 | if (avctx->height & 3 || avctx->width & 3) { |
| 86 | av_log(avctx, AV_LOG_ERROR, |
| 87 | "width %d and height %d must be multiplie of 4.\n", |
| 88 | avctx->width, avctx->height); |
| 89 | return AVERROR_INVALIDDATA; |
| 90 | } |
| 91 | |
| 92 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| 93 | |
| 94 | c->pic = av_frame_alloc(); |
| 95 | if (!c->pic) |
| 96 | return AVERROR(ENOMEM); |
| 97 | |
| 98 | c->frame_size = avctx->width * FFALIGN(avctx->height, 256); |
| 99 | c->video_size = avctx->width * avctx->height; |
| 100 | for (i = 0; i < 4; i++) { |
| 101 | c->frame[i] = av_mallocz(c->frame_size); |
| 102 | if (!c->frame[i]) { |
| 103 | paf_video_close(avctx); |
| 104 | return AVERROR(ENOMEM); |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static void read4x4block(PAFVideoDecContext *c, uint8_t *dst, int width) |
| 112 | { |
| 113 | int i; |
| 114 | |
| 115 | for (i = 0; i < 4; i++) { |
| 116 | bytestream2_get_buffer(&c->gb, dst, 4); |
| 117 | dst += width; |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | static void copy_color_mask(uint8_t *dst, int width, uint8_t mask, uint8_t color) |
| 122 | { |
| 123 | int i; |
| 124 | |
| 125 | for (i = 0; i < 4; i++) { |
| 126 | if (mask & (1 << 7 - i)) |
| 127 | dst[i] = color; |
| 128 | if (mask & (1 << 3 - i)) |
| 129 | dst[width + i] = color; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | static void copy_src_mask(uint8_t *dst, int width, uint8_t mask, const uint8_t *src) |
| 134 | { |
| 135 | int i; |
| 136 | |
| 137 | for (i = 0; i < 4; i++) { |
| 138 | if (mask & (1 << 7 - i)) |
| 139 | dst[i] = src[i]; |
| 140 | if (mask & (1 << 3 - i)) |
| 141 | dst[width + i] = src[width + i]; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | static void set_src_position(PAFVideoDecContext *c, |
| 146 | const uint8_t **p, |
| 147 | const uint8_t **pend) |
| 148 | { |
| 149 | int val = bytestream2_get_be16(&c->gb); |
| 150 | int page = val >> 14; |
| 151 | int x = (val & 0x7F); |
| 152 | int y = ((val >> 7) & 0x7F); |
| 153 | |
| 154 | *p = c->frame[page] + x * 2 + y * 2 * c->width; |
| 155 | *pend = c->frame[page] + c->frame_size; |
| 156 | } |
| 157 | |
| 158 | static int decode_0(PAFVideoDecContext *c, uint8_t *pkt, uint8_t code) |
| 159 | { |
| 160 | uint32_t opcode_size, offset; |
| 161 | uint8_t *dst, *dend, mask = 0, color = 0; |
| 162 | const uint8_t *src, *send, *opcodes; |
| 163 | int i, j, op = 0; |
| 164 | |
| 165 | i = bytestream2_get_byte(&c->gb); |
| 166 | if (i) { |
| 167 | if (code & 0x10) { |
| 168 | int align; |
| 169 | |
| 170 | align = bytestream2_tell(&c->gb) & 3; |
| 171 | if (align) |
| 172 | bytestream2_skip(&c->gb, 4 - align); |
| 173 | } |
| 174 | do { |
| 175 | int page, val, x, y; |
| 176 | val = bytestream2_get_be16(&c->gb); |
| 177 | page = val >> 14; |
| 178 | x = (val & 0x7F) * 2; |
| 179 | y = ((val >> 7) & 0x7F) * 2; |
| 180 | dst = c->frame[page] + x + y * c->width; |
| 181 | dend = c->frame[page] + c->frame_size; |
| 182 | offset = (x & 0x7F) * 2; |
| 183 | j = bytestream2_get_le16(&c->gb) + offset; |
| 184 | do { |
| 185 | offset++; |
| 186 | if (dst + 3 * c->width + 4 > dend) |
| 187 | return AVERROR_INVALIDDATA; |
| 188 | read4x4block(c, dst, c->width); |
| 189 | if ((offset & 0x3F) == 0) |
| 190 | dst += c->width * 3; |
| 191 | dst += 4; |
| 192 | } while (offset < j); |
| 193 | } while (--i); |
| 194 | } |
| 195 | |
| 196 | dst = c->frame[c->current_frame]; |
| 197 | dend = c->frame[c->current_frame] + c->frame_size; |
| 198 | do { |
| 199 | set_src_position(c, &src, &send); |
| 200 | if ((src + 3 * c->width + 4 > send) || |
| 201 | (dst + 3 * c->width + 4 > dend)) |
| 202 | return AVERROR_INVALIDDATA; |
| 203 | copy_block4(dst, src, c->width, c->width, 4); |
| 204 | i++; |
| 205 | if ((i & 0x3F) == 0) |
| 206 | dst += c->width * 3; |
| 207 | dst += 4; |
| 208 | } while (i < c->video_size / 16); |
| 209 | |
| 210 | opcode_size = bytestream2_get_le16(&c->gb); |
| 211 | bytestream2_skip(&c->gb, 2); |
| 212 | |
| 213 | if (bytestream2_get_bytes_left(&c->gb) < opcode_size) |
| 214 | return AVERROR_INVALIDDATA; |
| 215 | |
| 216 | opcodes = pkt + bytestream2_tell(&c->gb); |
| 217 | bytestream2_skipu(&c->gb, opcode_size); |
| 218 | |
| 219 | dst = c->frame[c->current_frame]; |
| 220 | |
| 221 | for (i = 0; i < c->height; i += 4, dst += c->width * 3) |
| 222 | for (j = 0; j < c->width; j += 4, dst += 4) { |
| 223 | int opcode, k = 0; |
| 224 | if (op > opcode_size) |
| 225 | return AVERROR_INVALIDDATA; |
| 226 | if (j & 4) { |
| 227 | opcode = opcodes[op] & 15; |
| 228 | op++; |
| 229 | } else { |
| 230 | opcode = opcodes[op] >> 4; |
| 231 | } |
| 232 | |
| 233 | while (block_sequences[opcode][k]) { |
| 234 | offset = c->width * 2; |
| 235 | code = block_sequences[opcode][k++]; |
| 236 | |
| 237 | switch (code) { |
| 238 | case 2: |
| 239 | offset = 0; |
| 240 | case 3: |
| 241 | color = bytestream2_get_byte(&c->gb); |
| 242 | case 4: |
| 243 | mask = bytestream2_get_byte(&c->gb); |
| 244 | copy_color_mask(dst + offset, c->width, mask, color); |
| 245 | break; |
| 246 | case 5: |
| 247 | offset = 0; |
| 248 | case 6: |
| 249 | set_src_position(c, &src, &send); |
| 250 | case 7: |
| 251 | if (src + offset + c->width + 4 > send) |
| 252 | return AVERROR_INVALIDDATA; |
| 253 | mask = bytestream2_get_byte(&c->gb); |
| 254 | copy_src_mask(dst + offset, c->width, mask, src + offset); |
| 255 | break; |
| 256 | } |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | static int paf_video_decode(AVCodecContext *avctx, void *data, |
| 264 | int *got_frame, AVPacket *pkt) |
| 265 | { |
| 266 | PAFVideoDecContext *c = avctx->priv_data; |
| 267 | uint8_t code, *dst, *end; |
| 268 | int i, frame, ret; |
| 269 | |
| 270 | if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) |
| 271 | return ret; |
| 272 | |
| 273 | bytestream2_init(&c->gb, pkt->data, pkt->size); |
| 274 | |
| 275 | code = bytestream2_get_byte(&c->gb); |
| 276 | if (code & 0x20) { // frame is keyframe |
| 277 | for (i = 0; i < 4; i++) |
| 278 | memset(c->frame[i], 0, c->frame_size); |
| 279 | |
| 280 | memset(c->pic->data[1], 0, AVPALETTE_SIZE); |
| 281 | c->current_frame = 0; |
| 282 | c->pic->key_frame = 1; |
| 283 | c->pic->pict_type = AV_PICTURE_TYPE_I; |
| 284 | } else { |
| 285 | c->pic->key_frame = 0; |
| 286 | c->pic->pict_type = AV_PICTURE_TYPE_P; |
| 287 | } |
| 288 | |
| 289 | if (code & 0x40) { // palette update |
| 290 | uint32_t *out = (uint32_t *)c->pic->data[1]; |
| 291 | int index, count; |
| 292 | |
| 293 | index = bytestream2_get_byte(&c->gb); |
| 294 | count = bytestream2_get_byte(&c->gb) + 1; |
| 295 | |
| 296 | if (index + count > 256) |
| 297 | return AVERROR_INVALIDDATA; |
| 298 | if (bytestream2_get_bytes_left(&c->gb) < 3 * count) |
| 299 | return AVERROR_INVALIDDATA; |
| 300 | |
| 301 | out += index; |
| 302 | for (i = 0; i < count; i++) { |
| 303 | unsigned r, g, b; |
| 304 | |
| 305 | r = bytestream2_get_byteu(&c->gb); |
| 306 | r = r << 2 | r >> 4; |
| 307 | g = bytestream2_get_byteu(&c->gb); |
| 308 | g = g << 2 | g >> 4; |
| 309 | b = bytestream2_get_byteu(&c->gb); |
| 310 | b = b << 2 | b >> 4; |
| 311 | *out++ = (0xFFU << 24) | (r << 16) | (g << 8) | b; |
| 312 | } |
| 313 | c->pic->palette_has_changed = 1; |
| 314 | } |
| 315 | |
| 316 | switch (code & 0x0F) { |
| 317 | case 0: |
| 318 | /* Block-based motion compensation using 4x4 blocks with either |
| 319 | * horizontal or vertical vectors; might incorporate VQ as well. */ |
| 320 | if ((ret = decode_0(c, pkt->data, code)) < 0) |
| 321 | return ret; |
| 322 | break; |
| 323 | case 1: |
| 324 | /* Uncompressed data. This mode specifies that (width * height) bytes |
| 325 | * should be copied directly from the encoded buffer into the output. */ |
| 326 | dst = c->frame[c->current_frame]; |
| 327 | // possibly chunk length data |
| 328 | bytestream2_skip(&c->gb, 2); |
| 329 | if (bytestream2_get_bytes_left(&c->gb) < c->video_size) |
| 330 | return AVERROR_INVALIDDATA; |
| 331 | bytestream2_get_bufferu(&c->gb, dst, c->video_size); |
| 332 | break; |
| 333 | case 2: |
| 334 | /* Copy reference frame: Consume the next byte in the stream as the |
| 335 | * reference frame (which should be 0, 1, 2, or 3, and should not be |
| 336 | * the same as the current frame number). */ |
| 337 | frame = bytestream2_get_byte(&c->gb); |
| 338 | if (frame > 3) |
| 339 | return AVERROR_INVALIDDATA; |
| 340 | if (frame != c->current_frame) |
| 341 | memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size); |
| 342 | break; |
| 343 | case 4: |
| 344 | /* Run length encoding.*/ |
| 345 | dst = c->frame[c->current_frame]; |
| 346 | end = dst + c->video_size; |
| 347 | |
| 348 | bytestream2_skip(&c->gb, 2); |
| 349 | |
| 350 | while (dst < end) { |
| 351 | int8_t code; |
| 352 | int count; |
| 353 | |
| 354 | if (bytestream2_get_bytes_left(&c->gb) < 2) |
| 355 | return AVERROR_INVALIDDATA; |
| 356 | |
| 357 | code = bytestream2_get_byteu(&c->gb); |
| 358 | count = FFABS(code) + 1; |
| 359 | |
| 360 | if (dst + count > end) |
| 361 | return AVERROR_INVALIDDATA; |
| 362 | if (code < 0) |
| 363 | memset(dst, bytestream2_get_byteu(&c->gb), count); |
| 364 | else |
| 365 | bytestream2_get_buffer(&c->gb, dst, count); |
| 366 | dst += count; |
| 367 | } |
| 368 | break; |
| 369 | default: |
| 370 | avpriv_request_sample(avctx, "unknown/invalid code"); |
| 371 | return AVERROR_INVALIDDATA; |
| 372 | } |
| 373 | |
| 374 | av_image_copy_plane(c->pic->data[0], c->pic->linesize[0], |
| 375 | c->frame[c->current_frame], c->width, |
| 376 | c->width, c->height); |
| 377 | |
| 378 | c->current_frame = (c->current_frame + 1) & 3; |
| 379 | if ((ret = av_frame_ref(data, c->pic)) < 0) |
| 380 | return ret; |
| 381 | |
| 382 | *got_frame = 1; |
| 383 | |
| 384 | return pkt->size; |
| 385 | } |
| 386 | |
| 387 | AVCodec ff_paf_video_decoder = { |
| 388 | .name = "paf_video", |
| 389 | .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"), |
| 390 | .type = AVMEDIA_TYPE_VIDEO, |
| 391 | .id = AV_CODEC_ID_PAF_VIDEO, |
| 392 | .priv_data_size = sizeof(PAFVideoDecContext), |
| 393 | .init = paf_video_init, |
| 394 | .close = paf_video_close, |
| 395 | .decode = paf_video_decode, |
| 396 | .capabilities = CODEC_CAP_DR1, |
| 397 | }; |