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| 1 | +/* |
| 2 | + * MagicYUV decoder |
| 3 | + * Copyright (c) 2016 Paul B Mahol |
| 4 | + * |
| 5 | + * This file is part of Libav. |
| 6 | + * |
| 7 | + * Libav 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 | + * Libav 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 Libav; if not, write to the Free Software |
| 19 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | + */ |
| 21 | + |
| 22 | +#include <stdlib.h> |
| 23 | +#include <string.h> |
| 24 | + |
| 25 | +#include "../libavutil/pixdesc.h" |
| 26 | + |
| 27 | +#include "avcodec.h" |
| 28 | +#include "bytestream.h" |
| 29 | +#include "get_bits.h" |
| 30 | +#include "huffyuvdsp.h" |
| 31 | +#include "internal.h" |
| 32 | +#include "thread.h" |
| 33 | + |
| 34 | +typedef struct Slice { |
| 35 | + uint32_t start; |
| 36 | + uint32_t size; |
| 37 | +} Slice; |
| 38 | + |
| 39 | +typedef enum Prediction { |
| 40 | + LEFT = 1, |
| 41 | + GRADIENT, |
| 42 | + MEDIAN, |
| 43 | +} Prediction; |
| 44 | + |
| 45 | +typedef struct HuffEntry { |
| 46 | + uint8_t sym; |
| 47 | + uint8_t len; |
| 48 | + uint32_t code; |
| 49 | +} HuffEntry; |
| 50 | + |
| 51 | +typedef struct MagicYUVContext { |
| 52 | + AVFrame *p; |
| 53 | + int slice_height; |
| 54 | + int nb_slices; |
| 55 | + int planes; // number of encoded planes in bitstream |
| 56 | + int decorrelate; // postprocessing work |
| 57 | + int interlaced; // video is interlaced |
| 58 | + uint8_t *buf; // pointer to AVPacket->data |
| 59 | + int hshift[4]; |
| 60 | + int vshift[4]; |
| 61 | + Slice *slices[4]; // slice bitstream positions for each plane |
| 62 | + unsigned int slices_size[4]; // slice sizes for each plane |
| 63 | + uint8_t len[4][256]; // table of code lengths for each plane |
| 64 | + VLC vlc[4]; // VLC for each plane |
| 65 | + HuffYUVDSPContext hdsp; |
| 66 | +} MagicYUVContext; |
| 67 | + |
| 68 | +static int huff_cmp_len(const void *a, const void *b) |
| 69 | +{ |
| 70 | + const HuffEntry *aa = a, *bb = b; |
| 71 | + return (aa->len - bb->len) * 256 + aa->sym - bb->sym; |
| 72 | +} |
| 73 | + |
| 74 | +static int huff_build(VLC *vlc, uint8_t *len) |
| 75 | +{ |
| 76 | + HuffEntry he[256]; |
| 77 | + uint32_t codes[256]; |
| 78 | + uint8_t bits[256]; |
| 79 | + uint8_t syms[256]; |
| 80 | + uint32_t code; |
| 81 | + int i; |
| 82 | + |
| 83 | + for (i = 0; i < 256; i++) { |
| 84 | + he[i].sym = 255 - i; |
| 85 | + he[i].len = len[i]; |
| 86 | + } |
| 87 | + qsort(he, 256, sizeof(HuffEntry), huff_cmp_len); |
| 88 | + |
| 89 | + code = 1; |
| 90 | + for (i = 255; i >= 0; i--) { |
| 91 | + codes[i] = code >> (32 - he[i].len); |
| 92 | + bits[i] = he[i].len; |
| 93 | + syms[i] = he[i].sym; |
| 94 | + code += 0x80000000u >> (he[i].len - 1); |
| 95 | + } |
| 96 | + |
| 97 | + ff_free_vlc(vlc); |
| 98 | + return ff_init_vlc_sparse(vlc, FFMIN(he[255].len, 12), 256, |
| 99 | + bits, sizeof(*bits), sizeof(*bits), |
| 100 | + codes, sizeof(*codes), sizeof(*codes), |
| 101 | + syms, sizeof(*syms), sizeof(*syms), 0); |
| 102 | +} |
| 103 | + |
| 104 | +static int magy_decode_slice(AVCodecContext *avctx, void *tdata, |
| 105 | + int j, int threadnr) |
| 106 | +{ |
| 107 | + MagicYUVContext *s = avctx->priv_data; |
| 108 | + int interlaced = s->interlaced; |
| 109 | + AVFrame *p = s->p; |
| 110 | + int i, k, x; |
| 111 | + GetBitContext gb; |
| 112 | + uint8_t *dst; |
| 113 | + |
| 114 | + for (i = 0; i < s->planes; i++) { |
| 115 | + int left, lefttop, top; |
| 116 | + int height = AV_CEIL_RSHIFT(FFMIN(s->slice_height, avctx->height - j * s->slice_height), s->vshift[i]); |
| 117 | + int width = AV_CEIL_RSHIFT(avctx->width, s->hshift[i]); |
| 118 | + int sheight = AV_CEIL_RSHIFT(s->slice_height, s->vshift[i]); |
| 119 | + ptrdiff_t fake_stride = p->linesize[i] * (1 + interlaced); |
| 120 | + ptrdiff_t stride = p->linesize[i]; |
| 121 | + int flags, pred; |
| 122 | + int ret = init_get_bits8(&gb, s->buf + s->slices[i][j].start, |
| 123 | + s->slices[i][j].size); |
| 124 | + |
| 125 | + if (ret < 0) |
| 126 | + return ret; |
| 127 | + |
| 128 | + flags = get_bits(&gb, 8); |
| 129 | + pred = get_bits(&gb, 8); |
| 130 | + |
| 131 | + dst = p->data[i] + j * sheight * stride; |
| 132 | + if (flags & 1) { |
| 133 | + for (k = 0; k < height; k++) { |
| 134 | + for (x = 0; x < width; x++) |
| 135 | + dst[x] = get_bits(&gb, 8); |
| 136 | + |
| 137 | + dst += stride; |
| 138 | + } |
| 139 | + } else { |
| 140 | + for (k = 0; k < height; k++) { |
| 141 | + for (x = 0; x < width; x++) { |
| 142 | + int pix; |
| 143 | + if (get_bits_left(&gb) <= 0) |
| 144 | + return AVERROR_INVALIDDATA; |
| 145 | + |
| 146 | + pix = get_vlc2(&gb, s->vlc[i].table, s->vlc[i].bits, 3); |
| 147 | + if (pix < 0) |
| 148 | + return AVERROR_INVALIDDATA; |
| 149 | + |
| 150 | + dst[x] = 255 - pix; |
| 151 | + } |
| 152 | + dst += stride; |
| 153 | + } |
| 154 | + } |
| 155 | + |
| 156 | + switch (pred) { |
| 157 | + case LEFT: |
| 158 | + dst = p->data[i] + j * sheight * stride; |
| 159 | + s->hdsp.add_hfyu_left_pred(dst, dst, width, 0); |
| 160 | + dst += stride; |
| 161 | + if (interlaced) { |
| 162 | + s->hdsp.add_hfyu_left_pred(dst, dst, width, 0); |
| 163 | + dst += stride; |
| 164 | + } |
| 165 | + for (k = 1 + interlaced; k < height; k++) { |
| 166 | + s->hdsp.add_hfyu_left_pred(dst, dst, width, dst[-fake_stride]); |
| 167 | + dst += stride; |
| 168 | + } |
| 169 | + break; |
| 170 | + case GRADIENT: |
| 171 | + dst = p->data[i] + j * sheight * stride; |
| 172 | + s->hdsp.add_hfyu_left_pred(dst, dst, width, 0); |
| 173 | + left = lefttop = 0; |
| 174 | + dst += stride; |
| 175 | + if (interlaced) { |
| 176 | + s->hdsp.add_hfyu_left_pred(dst, dst, width, 0); |
| 177 | + left = lefttop = 0; |
| 178 | + dst += stride; |
| 179 | + } |
| 180 | + for (k = 1 + interlaced; k < height; k++) { |
| 181 | + top = dst[-fake_stride]; |
| 182 | + left = top + dst[0]; |
| 183 | + dst[0] = left; |
| 184 | + for (x = 1; x < width; x++) { |
| 185 | + top = dst[x - fake_stride]; |
| 186 | + lefttop = dst[x - (fake_stride + 1)]; |
| 187 | + left += top - lefttop + dst[x]; |
| 188 | + dst[x] = left; |
| 189 | + } |
| 190 | + dst += stride; |
| 191 | + } |
| 192 | + break; |
| 193 | + case MEDIAN: |
| 194 | + dst = p->data[i] + j * sheight * stride; |
| 195 | + lefttop = left = dst[0]; |
| 196 | + s->hdsp.add_hfyu_left_pred(dst, dst, width, 0); |
| 197 | + dst += stride; |
| 198 | + if (interlaced) { |
| 199 | + lefttop = left = dst[0]; |
| 200 | + s->hdsp.add_hfyu_left_pred(dst, dst, width, 0); |
| 201 | + dst += stride; |
| 202 | + } |
| 203 | + for (k = 1 + interlaced; k < height; k++) { |
| 204 | + s->hdsp.add_hfyu_median_pred(dst, dst - fake_stride, |
| 205 | + dst, width, &left, &lefttop); |
| 206 | + lefttop = left = dst[0]; |
| 207 | + dst += stride; |
| 208 | + } |
| 209 | + break; |
| 210 | + default: |
| 211 | + avpriv_request_sample(avctx, "Unknown prediction: %d", pred); |
| 212 | + } |
| 213 | + } |
| 214 | + |
| 215 | + if (s->decorrelate) { |
| 216 | + int height = FFMIN(s->slice_height, avctx->height - j * s->slice_height); |
| 217 | + int width = avctx->width; |
| 218 | + uint8_t *b = p->data[0] + j * s->slice_height * p->linesize[0]; |
| 219 | + uint8_t *g = p->data[1] + j * s->slice_height * p->linesize[1]; |
| 220 | + uint8_t *r = p->data[2] + j * s->slice_height * p->linesize[2]; |
| 221 | + |
| 222 | + for (i = 0; i < height; i++) { |
| 223 | + s->hdsp.add_bytes(b, g, width); |
| 224 | + s->hdsp.add_bytes(r, g, width); |
| 225 | + b += p->linesize[0]; |
| 226 | + g += p->linesize[1]; |
| 227 | + r += p->linesize[2]; |
| 228 | + } |
| 229 | + } |
| 230 | + |
| 231 | + return 0; |
| 232 | +} |
| 233 | + |
| 234 | +static int magy_decode_frame(AVCodecContext *avctx, void *data, |
| 235 | + int *got_frame, AVPacket *avpkt) |
| 236 | +{ |
| 237 | + MagicYUVContext *s = avctx->priv_data; |
| 238 | + ThreadFrame frame = { .f = data }; |
| 239 | + AVFrame *p = data; |
| 240 | + GetByteContext gbyte; |
| 241 | + GetBitContext gbit; |
| 242 | + uint32_t first_offset, offset, next_offset, header_size, slice_width; |
| 243 | + int width, height, format, version, table_size; |
| 244 | + int ret, i, j, k; |
| 245 | + |
| 246 | + bytestream2_init(&gbyte, avpkt->data, avpkt->size); |
| 247 | + if (bytestream2_get_le32(&gbyte) != MKTAG('M', 'A', 'G', 'Y')) |
| 248 | + return AVERROR_INVALIDDATA; |
| 249 | + |
| 250 | + header_size = bytestream2_get_le32(&gbyte); |
| 251 | + if (header_size < 32 || header_size >= avpkt->size) { |
| 252 | + av_log(avctx, AV_LOG_ERROR, |
| 253 | + "header or packet too small %"PRIu32"\n", header_size); |
| 254 | + return AVERROR_INVALIDDATA; |
| 255 | + } |
| 256 | + |
| 257 | + version = bytestream2_get_byte(&gbyte); |
| 258 | + if (version != 7) { |
| 259 | + avpriv_request_sample(avctx, "Version %d", version); |
| 260 | + return AVERROR_PATCHWELCOME; |
| 261 | + } |
| 262 | + |
| 263 | + s->hshift[1] = |
| 264 | + s->vshift[1] = |
| 265 | + s->hshift[2] = |
| 266 | + s->vshift[2] = 0; |
| 267 | + s->decorrelate = 0; |
| 268 | + |
| 269 | + format = bytestream2_get_byte(&gbyte); |
| 270 | + switch (format) { |
| 271 | + case 0x65: |
| 272 | + avctx->pix_fmt = AV_PIX_FMT_GBRP; |
| 273 | + s->decorrelate = 1; |
| 274 | + break; |
| 275 | + case 0x66: |
| 276 | + avctx->pix_fmt = AV_PIX_FMT_GBRAP; |
| 277 | + s->decorrelate = 1; |
| 278 | + break; |
| 279 | + case 0x67: |
| 280 | + avctx->pix_fmt = AV_PIX_FMT_YUV444P; |
| 281 | + break; |
| 282 | + case 0x68: |
| 283 | + avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
| 284 | + s->hshift[1] = |
| 285 | + s->hshift[2] = 1; |
| 286 | + break; |
| 287 | + case 0x69: |
| 288 | + avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 289 | + s->hshift[1] = |
| 290 | + s->vshift[1] = |
| 291 | + s->hshift[2] = |
| 292 | + s->vshift[2] = 1; |
| 293 | + break; |
| 294 | + case 0x6a: |
| 295 | + avctx->pix_fmt = AV_PIX_FMT_YUVA444P; |
| 296 | + break; |
| 297 | + case 0x6b: |
| 298 | + avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
| 299 | + break; |
| 300 | + default: |
| 301 | + avpriv_request_sample(avctx, "Format 0x%X", format); |
| 302 | + return AVERROR_PATCHWELCOME; |
| 303 | + } |
| 304 | + s->planes = av_pix_fmt_count_planes(avctx->pix_fmt); |
| 305 | + |
| 306 | + bytestream2_skip(&gbyte, 2); |
| 307 | + s->interlaced = !!(bytestream2_get_byte(&gbyte) & 2); |
| 308 | + bytestream2_skip(&gbyte, 3); |
| 309 | + |
| 310 | + width = bytestream2_get_le32(&gbyte); |
| 311 | + height = bytestream2_get_le32(&gbyte); |
| 312 | + ret = ff_set_dimensions(avctx, width, height); |
| 313 | + if (ret < 0) |
| 314 | + return ret; |
| 315 | + |
| 316 | + slice_width = bytestream2_get_le32(&gbyte); |
| 317 | + if (slice_width != width) { |
| 318 | + avpriv_request_sample(avctx, "Slice width %"PRIu32, slice_width); |
| 319 | + return AVERROR_PATCHWELCOME; |
| 320 | + } |
| 321 | + s->slice_height = bytestream2_get_le32(&gbyte); |
| 322 | + if (s->slice_height <= 0 || s->slice_height > INT_MAX - height) { |
| 323 | + av_log(avctx, AV_LOG_ERROR, |
| 324 | + "invalid slice height: %d\n", s->slice_height); |
| 325 | + return AVERROR_INVALIDDATA; |
| 326 | + } |
| 327 | + |
| 328 | + bytestream2_skip(&gbyte, 4); |
| 329 | + |
| 330 | + s->nb_slices = (height + s->slice_height - 1) / s->slice_height; |
| 331 | + if (s->nb_slices > INT_MAX / sizeof(Slice)) { |
| 332 | + av_log(avctx, AV_LOG_ERROR, |
| 333 | + "invalid number of slices: %d\n", s->nb_slices); |
| 334 | + return AVERROR_INVALIDDATA; |
| 335 | + } |
| 336 | + |
| 337 | + for (i = 0; i < s->planes; i++) { |
| 338 | + av_fast_malloc(&s->slices[i], &s->slices_size[i], s->nb_slices * sizeof(Slice)); |
| 339 | + if (!s->slices[i]) |
| 340 | + return AVERROR(ENOMEM); |
| 341 | + |
| 342 | + offset = bytestream2_get_le32(&gbyte); |
| 343 | + if (offset >= avpkt->size - header_size) |
| 344 | + return AVERROR_INVALIDDATA; |
| 345 | + |
| 346 | + if (i == 0) |
| 347 | + first_offset = offset; |
| 348 | + |
| 349 | + for (j = 0; j < s->nb_slices - 1; j++) { |
| 350 | + s->slices[i][j].start = offset + header_size; |
| 351 | + |
| 352 | + next_offset = bytestream2_get_le32(&gbyte); |
| 353 | + if (next_offset <= offset || next_offset >= avpkt->size - header_size) |
| 354 | + return AVERROR_INVALIDDATA; |
| 355 | + |
| 356 | + s->slices[i][j].size = next_offset - offset; |
| 357 | + offset = next_offset; |
| 358 | + } |
| 359 | + |
| 360 | + s->slices[i][j].start = offset + header_size; |
| 361 | + s->slices[i][j].size = avpkt->size - s->slices[i][j].start; |
| 362 | + } |
| 363 | + |
| 364 | + if (bytestream2_get_byte(&gbyte) != s->planes) |
| 365 | + return AVERROR_INVALIDDATA; |
| 366 | + |
| 367 | + bytestream2_skip(&gbyte, s->nb_slices * s->planes); |
| 368 | + |
| 369 | + table_size = header_size + first_offset - bytestream2_tell(&gbyte); |
| 370 | + if (table_size < 2) |
| 371 | + return AVERROR_INVALIDDATA; |
| 372 | + |
| 373 | + ret = init_get_bits8(&gbit, avpkt->data + bytestream2_tell(&gbyte), table_size); |
| 374 | + if (ret < 0) |
| 375 | + return ret; |
| 376 | + |
| 377 | + memset(s->len, 0, sizeof(s->len)); |
| 378 | + j = i = 0; |
| 379 | + while (get_bits_left(&gbit) >= 8) { |
| 380 | + int b = get_bits(&gbit, 4); |
| 381 | + int x = get_bits(&gbit, 4); |
| 382 | + int l = get_bitsz(&gbit, b) + 1; |
| 383 | + |
| 384 | + for (k = 0; k < l; k++) |
| 385 | + if (j + k < 256) |
| 386 | + s->len[i][j + k] = x; |
| 387 | + |
| 388 | + j += l; |
| 389 | + if (j == 256) { |
| 390 | + j = 0; |
| 391 | + if (huff_build(&s->vlc[i], s->len[i])) { |
| 392 | + av_log(avctx, AV_LOG_ERROR, "Cannot build Huffman codes\n"); |
| 393 | + return AVERROR_INVALIDDATA; |
| 394 | + } |
| 395 | + i++; |
| 396 | + if (i == s->planes) { |
| 397 | + break; |
| 398 | + } |
| 399 | + } else if (j > 256) { |
| 400 | + return AVERROR_INVALIDDATA; |
| 401 | + } |
| 402 | + } |
| 403 | + |
| 404 | + if (i != s->planes) { |
| 405 | + av_log(avctx, AV_LOG_ERROR, "Huffman tables too short\n"); |
| 406 | + return AVERROR_INVALIDDATA; |
| 407 | + } |
| 408 | + |
| 409 | + p->pict_type = AV_PICTURE_TYPE_I; |
| 410 | + p->key_frame = 1; |
| 411 | + |
| 412 | + if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) |
| 413 | + return ret; |
| 414 | + |
| 415 | + s->buf = avpkt->data; |
| 416 | + s->p = p; |
| 417 | + avctx->execute2(avctx, magy_decode_slice, NULL, NULL, s->nb_slices); |
| 418 | + |
| 419 | + if (avctx->pix_fmt == AV_PIX_FMT_GBRP || |
| 420 | + avctx->pix_fmt == AV_PIX_FMT_GBRAP) { |
| 421 | + FFSWAP(uint8_t*, p->data[0], p->data[1]); |
| 422 | + FFSWAP(int, p->linesize[0], p->linesize[1]); |
| 423 | + } |
| 424 | + |
| 425 | + *got_frame = 1; |
| 426 | + |
| 427 | + return avpkt->size; |
| 428 | +} |
| 429 | + |
| 430 | +#if HAVE_THREADS |
| 431 | +static int magy_init_thread_copy(AVCodecContext *avctx) |
| 432 | +{ |
| 433 | + MagicYUVContext *s = avctx->priv_data; |
| 434 | + int i; |
| 435 | + |
| 436 | + for (i = 0; i < FF_ARRAY_ELEMS(s->slices); i++) { |
| 437 | + s->slices[i] = NULL; |
| 438 | + s->slices_size[i] = 0; |
| 439 | + } |
| 440 | + |
| 441 | + return 0; |
| 442 | +} |
| 443 | +#endif |
| 444 | + |
| 445 | +static av_cold int magy_decode_init(AVCodecContext *avctx) |
| 446 | +{ |
| 447 | + MagicYUVContext *s = avctx->priv_data; |
| 448 | + ff_huffyuvdsp_init(&s->hdsp); |
| 449 | + return 0; |
| 450 | +} |
| 451 | + |
| 452 | +static av_cold int magy_decode_end(AVCodecContext *avctx) |
| 453 | +{ |
| 454 | + MagicYUVContext * const s = avctx->priv_data; |
| 455 | + int i; |
| 456 | + |
| 457 | + for (i = 0; i < FF_ARRAY_ELEMS(s->slices); i++) { |
| 458 | + av_freep(&s->slices[i]); |
| 459 | + s->slices_size[i] = 0; |
| 460 | + ff_free_vlc(&s->vlc[i]); |
| 461 | + } |
| 462 | + |
| 463 | + return 0; |
| 464 | +} |
| 465 | + |
| 466 | +AVCodec ff_magicyuv_decoder = { |
| 467 | + .name = "magicyuv", |
| 468 | + .long_name = NULL_IF_CONFIG_SMALL("MagicYUV video"), |
| 469 | + .type = AVMEDIA_TYPE_VIDEO, |
| 470 | + .id = AV_CODEC_ID_MAGICYUV, |
| 471 | + .priv_data_size = sizeof(MagicYUVContext), |
| 472 | + .init = magy_decode_init, |
| 473 | + .init_thread_copy = ONLY_IF_THREADS_ENABLED(magy_init_thread_copy), |
| 474 | + .close = magy_decode_end, |
| 475 | + .decode = magy_decode_frame, |
| 476 | + .capabilities = AV_CODEC_CAP_DR1 | |
| 477 | + AV_CODEC_CAP_FRAME_THREADS | |
| 478 | + AV_CODEC_CAP_SLICE_THREADS, |
| 479 | + .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
| 480 | +}; |