| 1 | /* |
| 2 | * Canopus Lossless Codec decoder |
| 3 | * |
| 4 | * Copyright (c) 2012-2013 Derek Buitenhuis |
| 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 "libavutil/intreadwrite.h" |
| 26 | #include "bswapdsp.h" |
| 27 | #include "get_bits.h" |
| 28 | #include "avcodec.h" |
| 29 | #include "internal.h" |
| 30 | |
| 31 | typedef struct CLLCContext { |
| 32 | AVCodecContext *avctx; |
| 33 | BswapDSPContext bdsp; |
| 34 | |
| 35 | uint8_t *swapped_buf; |
| 36 | int swapped_buf_size; |
| 37 | } CLLCContext; |
| 38 | |
| 39 | static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc) |
| 40 | { |
| 41 | uint8_t symbols[256]; |
| 42 | uint8_t bits[256]; |
| 43 | uint16_t codes[256]; |
| 44 | int num_lens, num_codes, num_codes_sum, prefix; |
| 45 | int i, j, count; |
| 46 | |
| 47 | prefix = 0; |
| 48 | count = 0; |
| 49 | num_codes_sum = 0; |
| 50 | |
| 51 | num_lens = get_bits(gb, 5); |
| 52 | |
| 53 | for (i = 0; i < num_lens; i++) { |
| 54 | num_codes = get_bits(gb, 9); |
| 55 | num_codes_sum += num_codes; |
| 56 | |
| 57 | if (num_codes_sum > 256) { |
| 58 | vlc->table = NULL; |
| 59 | |
| 60 | av_log(ctx->avctx, AV_LOG_ERROR, |
| 61 | "Too many VLCs (%d) to be read.\n", num_codes_sum); |
| 62 | return AVERROR_INVALIDDATA; |
| 63 | } |
| 64 | |
| 65 | for (j = 0; j < num_codes; j++) { |
| 66 | symbols[count] = get_bits(gb, 8); |
| 67 | bits[count] = i + 1; |
| 68 | codes[count] = prefix++; |
| 69 | |
| 70 | count++; |
| 71 | } |
| 72 | |
| 73 | prefix <<= 1; |
| 74 | } |
| 75 | |
| 76 | return ff_init_vlc_sparse(vlc, 7, count, bits, 1, 1, |
| 77 | codes, 2, 2, symbols, 1, 1, 0); |
| 78 | } |
| 79 | |
| 80 | /* |
| 81 | * Unlike the RGB24 read/restore, which reads in a component at a time, |
| 82 | * ARGB read/restore reads in ARGB quads. |
| 83 | */ |
| 84 | static int read_argb_line(CLLCContext *ctx, GetBitContext *gb, int *top_left, |
| 85 | VLC *vlc, uint8_t *outbuf) |
| 86 | { |
| 87 | uint8_t *dst; |
| 88 | int pred[4]; |
| 89 | int code; |
| 90 | int i; |
| 91 | |
| 92 | OPEN_READER(bits, gb); |
| 93 | |
| 94 | dst = outbuf; |
| 95 | pred[0] = top_left[0]; |
| 96 | pred[1] = top_left[1]; |
| 97 | pred[2] = top_left[2]; |
| 98 | pred[3] = top_left[3]; |
| 99 | |
| 100 | for (i = 0; i < ctx->avctx->width; i++) { |
| 101 | /* Always get the alpha component */ |
| 102 | UPDATE_CACHE(bits, gb); |
| 103 | GET_VLC(code, bits, gb, vlc[0].table, 7, 2); |
| 104 | |
| 105 | pred[0] += code; |
| 106 | dst[0] = pred[0]; |
| 107 | |
| 108 | /* Skip the components if they are entirely transparent */ |
| 109 | if (dst[0]) { |
| 110 | /* Red */ |
| 111 | UPDATE_CACHE(bits, gb); |
| 112 | GET_VLC(code, bits, gb, vlc[1].table, 7, 2); |
| 113 | |
| 114 | pred[1] += code; |
| 115 | dst[1] = pred[1]; |
| 116 | |
| 117 | /* Green */ |
| 118 | UPDATE_CACHE(bits, gb); |
| 119 | GET_VLC(code, bits, gb, vlc[2].table, 7, 2); |
| 120 | |
| 121 | pred[2] += code; |
| 122 | dst[2] = pred[2]; |
| 123 | |
| 124 | /* Blue */ |
| 125 | UPDATE_CACHE(bits, gb); |
| 126 | GET_VLC(code, bits, gb, vlc[3].table, 7, 2); |
| 127 | |
| 128 | pred[3] += code; |
| 129 | dst[3] = pred[3]; |
| 130 | } else { |
| 131 | dst[1] = 0; |
| 132 | dst[2] = 0; |
| 133 | dst[3] = 0; |
| 134 | } |
| 135 | |
| 136 | dst += 4; |
| 137 | } |
| 138 | |
| 139 | CLOSE_READER(bits, gb); |
| 140 | |
| 141 | top_left[0] = outbuf[0]; |
| 142 | |
| 143 | /* Only stash components if they are not transparent */ |
| 144 | if (top_left[0]) { |
| 145 | top_left[1] = outbuf[1]; |
| 146 | top_left[2] = outbuf[2]; |
| 147 | top_left[3] = outbuf[3]; |
| 148 | } |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static int read_rgb24_component_line(CLLCContext *ctx, GetBitContext *gb, |
| 154 | int *top_left, VLC *vlc, uint8_t *outbuf) |
| 155 | { |
| 156 | uint8_t *dst; |
| 157 | int pred, code; |
| 158 | int i; |
| 159 | |
| 160 | OPEN_READER(bits, gb); |
| 161 | |
| 162 | dst = outbuf; |
| 163 | pred = *top_left; |
| 164 | |
| 165 | /* Simultaneously read and restore the line */ |
| 166 | for (i = 0; i < ctx->avctx->width; i++) { |
| 167 | UPDATE_CACHE(bits, gb); |
| 168 | GET_VLC(code, bits, gb, vlc->table, 7, 2); |
| 169 | |
| 170 | pred += code; |
| 171 | dst[0] = pred; |
| 172 | dst += 3; |
| 173 | } |
| 174 | |
| 175 | CLOSE_READER(bits, gb); |
| 176 | |
| 177 | /* Stash the first pixel */ |
| 178 | *top_left = outbuf[0]; |
| 179 | |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | static int read_yuv_component_line(CLLCContext *ctx, GetBitContext *gb, |
| 184 | int *top_left, VLC *vlc, uint8_t *outbuf, |
| 185 | int is_chroma) |
| 186 | { |
| 187 | int pred, code; |
| 188 | int i; |
| 189 | |
| 190 | OPEN_READER(bits, gb); |
| 191 | |
| 192 | pred = *top_left; |
| 193 | |
| 194 | /* Simultaneously read and restore the line */ |
| 195 | for (i = 0; i < ctx->avctx->width >> is_chroma; i++) { |
| 196 | UPDATE_CACHE(bits, gb); |
| 197 | GET_VLC(code, bits, gb, vlc->table, 7, 2); |
| 198 | |
| 199 | pred += code; |
| 200 | outbuf[i] = pred; |
| 201 | } |
| 202 | |
| 203 | CLOSE_READER(bits, gb); |
| 204 | |
| 205 | /* Stash the first pixel */ |
| 206 | *top_left = outbuf[0]; |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | static int decode_argb_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic) |
| 212 | { |
| 213 | AVCodecContext *avctx = ctx->avctx; |
| 214 | uint8_t *dst; |
| 215 | int pred[4]; |
| 216 | int ret; |
| 217 | int i, j; |
| 218 | VLC vlc[4]; |
| 219 | |
| 220 | pred[0] = 0; |
| 221 | pred[1] = 0x80; |
| 222 | pred[2] = 0x80; |
| 223 | pred[3] = 0x80; |
| 224 | |
| 225 | dst = pic->data[0]; |
| 226 | |
| 227 | skip_bits(gb, 16); |
| 228 | |
| 229 | /* Read in code table for each plane */ |
| 230 | for (i = 0; i < 4; i++) { |
| 231 | ret = read_code_table(ctx, gb, &vlc[i]); |
| 232 | if (ret < 0) { |
| 233 | for (j = 0; j <= i; j++) |
| 234 | ff_free_vlc(&vlc[j]); |
| 235 | |
| 236 | av_log(ctx->avctx, AV_LOG_ERROR, |
| 237 | "Could not read code table %d.\n", i); |
| 238 | return ret; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | /* Read in and restore every line */ |
| 243 | for (i = 0; i < avctx->height; i++) { |
| 244 | read_argb_line(ctx, gb, pred, vlc, dst); |
| 245 | |
| 246 | dst += pic->linesize[0]; |
| 247 | } |
| 248 | |
| 249 | for (i = 0; i < 4; i++) |
| 250 | ff_free_vlc(&vlc[i]); |
| 251 | |
| 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | static int decode_rgb24_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic) |
| 256 | { |
| 257 | AVCodecContext *avctx = ctx->avctx; |
| 258 | uint8_t *dst; |
| 259 | int pred[3]; |
| 260 | int ret; |
| 261 | int i, j; |
| 262 | VLC vlc[3]; |
| 263 | |
| 264 | pred[0] = 0x80; |
| 265 | pred[1] = 0x80; |
| 266 | pred[2] = 0x80; |
| 267 | |
| 268 | dst = pic->data[0]; |
| 269 | |
| 270 | skip_bits(gb, 16); |
| 271 | |
| 272 | /* Read in code table for each plane */ |
| 273 | for (i = 0; i < 3; i++) { |
| 274 | ret = read_code_table(ctx, gb, &vlc[i]); |
| 275 | if (ret < 0) { |
| 276 | for (j = 0; j <= i; j++) |
| 277 | ff_free_vlc(&vlc[j]); |
| 278 | |
| 279 | av_log(ctx->avctx, AV_LOG_ERROR, |
| 280 | "Could not read code table %d.\n", i); |
| 281 | return ret; |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | /* Read in and restore every line */ |
| 286 | for (i = 0; i < avctx->height; i++) { |
| 287 | for (j = 0; j < 3; j++) |
| 288 | read_rgb24_component_line(ctx, gb, &pred[j], &vlc[j], &dst[j]); |
| 289 | |
| 290 | dst += pic->linesize[0]; |
| 291 | } |
| 292 | |
| 293 | for (i = 0; i < 3; i++) |
| 294 | ff_free_vlc(&vlc[i]); |
| 295 | |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | static int decode_yuv_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic) |
| 300 | { |
| 301 | AVCodecContext *avctx = ctx->avctx; |
| 302 | uint8_t block; |
| 303 | uint8_t *dst[3]; |
| 304 | int pred[3]; |
| 305 | int ret; |
| 306 | int i, j; |
| 307 | VLC vlc[2]; |
| 308 | |
| 309 | pred[0] = 0x80; |
| 310 | pred[1] = 0x80; |
| 311 | pred[2] = 0x80; |
| 312 | |
| 313 | dst[0] = pic->data[0]; |
| 314 | dst[1] = pic->data[1]; |
| 315 | dst[2] = pic->data[2]; |
| 316 | |
| 317 | skip_bits(gb, 8); |
| 318 | |
| 319 | block = get_bits(gb, 8); |
| 320 | if (block) { |
| 321 | avpriv_request_sample(ctx->avctx, "Blocked YUV"); |
| 322 | return AVERROR_PATCHWELCOME; |
| 323 | } |
| 324 | |
| 325 | /* Read in code table for luma and chroma */ |
| 326 | for (i = 0; i < 2; i++) { |
| 327 | ret = read_code_table(ctx, gb, &vlc[i]); |
| 328 | if (ret < 0) { |
| 329 | for (j = 0; j <= i; j++) |
| 330 | ff_free_vlc(&vlc[j]); |
| 331 | |
| 332 | av_log(ctx->avctx, AV_LOG_ERROR, |
| 333 | "Could not read code table %d.\n", i); |
| 334 | return ret; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | /* Read in and restore every line */ |
| 339 | for (i = 0; i < avctx->height; i++) { |
| 340 | read_yuv_component_line(ctx, gb, &pred[0], &vlc[0], dst[0], 0); /* Y */ |
| 341 | read_yuv_component_line(ctx, gb, &pred[1], &vlc[1], dst[1], 1); /* U */ |
| 342 | read_yuv_component_line(ctx, gb, &pred[2], &vlc[1], dst[2], 1); /* V */ |
| 343 | |
| 344 | for (j = 0; j < 3; j++) |
| 345 | dst[j] += pic->linesize[j]; |
| 346 | } |
| 347 | |
| 348 | for (i = 0; i < 2; i++) |
| 349 | ff_free_vlc(&vlc[i]); |
| 350 | |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | static int cllc_decode_frame(AVCodecContext *avctx, void *data, |
| 355 | int *got_picture_ptr, AVPacket *avpkt) |
| 356 | { |
| 357 | CLLCContext *ctx = avctx->priv_data; |
| 358 | AVFrame *pic = data; |
| 359 | uint8_t *src = avpkt->data; |
| 360 | uint32_t info_tag, info_offset; |
| 361 | int data_size; |
| 362 | GetBitContext gb; |
| 363 | int coding_type, ret; |
| 364 | |
| 365 | /* Skip the INFO header if present */ |
| 366 | info_offset = 0; |
| 367 | info_tag = AV_RL32(src); |
| 368 | if (info_tag == MKTAG('I', 'N', 'F', 'O')) { |
| 369 | info_offset = AV_RL32(src + 4); |
| 370 | if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) { |
| 371 | av_log(avctx, AV_LOG_ERROR, |
| 372 | "Invalid INFO header offset: 0x%08"PRIX32" is too large.\n", |
| 373 | info_offset); |
| 374 | return AVERROR_INVALIDDATA; |
| 375 | } |
| 376 | |
| 377 | info_offset += 8; |
| 378 | src += info_offset; |
| 379 | |
| 380 | av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n"); |
| 381 | } |
| 382 | |
| 383 | data_size = (avpkt->size - info_offset) & ~1; |
| 384 | |
| 385 | /* Make sure our bswap16'd buffer is big enough */ |
| 386 | av_fast_padded_malloc(&ctx->swapped_buf, |
| 387 | &ctx->swapped_buf_size, data_size); |
| 388 | if (!ctx->swapped_buf) { |
| 389 | av_log(avctx, AV_LOG_ERROR, "Could not allocate swapped buffer.\n"); |
| 390 | return AVERROR(ENOMEM); |
| 391 | } |
| 392 | |
| 393 | /* bswap16 the buffer since CLLC's bitreader works in 16-bit words */ |
| 394 | ctx->bdsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src, |
| 395 | data_size / 2); |
| 396 | |
| 397 | init_get_bits(&gb, ctx->swapped_buf, data_size * 8); |
| 398 | |
| 399 | /* |
| 400 | * Read in coding type. The types are as follows: |
| 401 | * |
| 402 | * 0 - YUY2 |
| 403 | * 1 - BGR24 (Triples) |
| 404 | * 2 - BGR24 (Quads) |
| 405 | * 3 - BGRA |
| 406 | */ |
| 407 | coding_type = (AV_RL32(src) >> 8) & 0xFF; |
| 408 | av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type); |
| 409 | |
| 410 | switch (coding_type) { |
| 411 | case 0: |
| 412 | avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
| 413 | avctx->bits_per_raw_sample = 8; |
| 414 | |
| 415 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
| 416 | return ret; |
| 417 | |
| 418 | ret = decode_yuv_frame(ctx, &gb, pic); |
| 419 | if (ret < 0) |
| 420 | return ret; |
| 421 | |
| 422 | break; |
| 423 | case 1: |
| 424 | case 2: |
| 425 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| 426 | avctx->bits_per_raw_sample = 8; |
| 427 | |
| 428 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
| 429 | return ret; |
| 430 | |
| 431 | ret = decode_rgb24_frame(ctx, &gb, pic); |
| 432 | if (ret < 0) |
| 433 | return ret; |
| 434 | |
| 435 | break; |
| 436 | case 3: |
| 437 | avctx->pix_fmt = AV_PIX_FMT_ARGB; |
| 438 | avctx->bits_per_raw_sample = 8; |
| 439 | |
| 440 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
| 441 | return ret; |
| 442 | |
| 443 | ret = decode_argb_frame(ctx, &gb, pic); |
| 444 | if (ret < 0) |
| 445 | return ret; |
| 446 | |
| 447 | break; |
| 448 | default: |
| 449 | av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d.\n", coding_type); |
| 450 | return AVERROR_INVALIDDATA; |
| 451 | } |
| 452 | |
| 453 | pic->key_frame = 1; |
| 454 | pic->pict_type = AV_PICTURE_TYPE_I; |
| 455 | |
| 456 | *got_picture_ptr = 1; |
| 457 | |
| 458 | return avpkt->size; |
| 459 | } |
| 460 | |
| 461 | static av_cold int cllc_decode_close(AVCodecContext *avctx) |
| 462 | { |
| 463 | CLLCContext *ctx = avctx->priv_data; |
| 464 | |
| 465 | av_freep(&ctx->swapped_buf); |
| 466 | |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | static av_cold int cllc_decode_init(AVCodecContext *avctx) |
| 471 | { |
| 472 | CLLCContext *ctx = avctx->priv_data; |
| 473 | |
| 474 | /* Initialize various context values */ |
| 475 | ctx->avctx = avctx; |
| 476 | ctx->swapped_buf = NULL; |
| 477 | ctx->swapped_buf_size = 0; |
| 478 | |
| 479 | ff_bswapdsp_init(&ctx->bdsp); |
| 480 | |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | AVCodec ff_cllc_decoder = { |
| 485 | .name = "cllc", |
| 486 | .long_name = NULL_IF_CONFIG_SMALL("Canopus Lossless Codec"), |
| 487 | .type = AVMEDIA_TYPE_VIDEO, |
| 488 | .id = AV_CODEC_ID_CLLC, |
| 489 | .priv_data_size = sizeof(CLLCContext), |
| 490 | .init = cllc_decode_init, |
| 491 | .decode = cllc_decode_frame, |
| 492 | .close = cllc_decode_close, |
| 493 | .capabilities = CODEC_CAP_DR1, |
| 494 | }; |