| 1 | /* |
| 2 | * Go2Webinar decoder |
| 3 | * Copyright (c) 2012 Konstantin Shishkov |
| 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 | /** |
| 23 | * @file |
| 24 | * Go2Webinar decoder |
| 25 | */ |
| 26 | |
| 27 | #include <inttypes.h> |
| 28 | #include <zlib.h> |
| 29 | |
| 30 | #include "libavutil/intreadwrite.h" |
| 31 | #include "avcodec.h" |
| 32 | #include "blockdsp.h" |
| 33 | #include "bytestream.h" |
| 34 | #include "idctdsp.h" |
| 35 | #include "get_bits.h" |
| 36 | #include "internal.h" |
| 37 | #include "mjpeg.h" |
| 38 | |
| 39 | enum ChunkType { |
| 40 | DISPLAY_INFO = 0xC8, |
| 41 | TILE_DATA, |
| 42 | CURSOR_POS, |
| 43 | CURSOR_SHAPE, |
| 44 | CHUNK_CC, |
| 45 | CHUNK_CD |
| 46 | }; |
| 47 | |
| 48 | enum Compression { |
| 49 | COMPR_EPIC_J_B = 2, |
| 50 | COMPR_KEMPF_J_B, |
| 51 | }; |
| 52 | |
| 53 | static const uint8_t luma_quant[64] = { |
| 54 | 8, 6, 5, 8, 12, 20, 26, 31, |
| 55 | 6, 6, 7, 10, 13, 29, 30, 28, |
| 56 | 7, 7, 8, 12, 20, 29, 35, 28, |
| 57 | 7, 9, 11, 15, 26, 44, 40, 31, |
| 58 | 9, 11, 19, 28, 34, 55, 52, 39, |
| 59 | 12, 18, 28, 32, 41, 52, 57, 46, |
| 60 | 25, 32, 39, 44, 52, 61, 60, 51, |
| 61 | 36, 46, 48, 49, 56, 50, 52, 50 |
| 62 | }; |
| 63 | |
| 64 | static const uint8_t chroma_quant[64] = { |
| 65 | 9, 9, 12, 24, 50, 50, 50, 50, |
| 66 | 9, 11, 13, 33, 50, 50, 50, 50, |
| 67 | 12, 13, 28, 50, 50, 50, 50, 50, |
| 68 | 24, 33, 50, 50, 50, 50, 50, 50, |
| 69 | 50, 50, 50, 50, 50, 50, 50, 50, |
| 70 | 50, 50, 50, 50, 50, 50, 50, 50, |
| 71 | 50, 50, 50, 50, 50, 50, 50, 50, |
| 72 | 50, 50, 50, 50, 50, 50, 50, 50, |
| 73 | }; |
| 74 | |
| 75 | typedef struct JPGContext { |
| 76 | BlockDSPContext bdsp; |
| 77 | IDCTDSPContext idsp; |
| 78 | ScanTable scantable; |
| 79 | |
| 80 | VLC dc_vlc[2], ac_vlc[2]; |
| 81 | int prev_dc[3]; |
| 82 | DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
| 83 | |
| 84 | uint8_t *buf; |
| 85 | } JPGContext; |
| 86 | |
| 87 | typedef struct G2MContext { |
| 88 | JPGContext jc; |
| 89 | int version; |
| 90 | |
| 91 | int compression; |
| 92 | int width, height, bpp; |
| 93 | int orig_width, orig_height; |
| 94 | int tile_width, tile_height; |
| 95 | int tiles_x, tiles_y, tile_x, tile_y; |
| 96 | |
| 97 | int got_header; |
| 98 | |
| 99 | uint8_t *framebuf; |
| 100 | int framebuf_stride, old_width, old_height; |
| 101 | |
| 102 | uint8_t *synth_tile, *jpeg_tile; |
| 103 | int tile_stride, old_tile_w, old_tile_h; |
| 104 | |
| 105 | uint8_t *kempf_buf, *kempf_flags; |
| 106 | |
| 107 | uint8_t *cursor; |
| 108 | int cursor_stride; |
| 109 | int cursor_fmt; |
| 110 | int cursor_w, cursor_h, cursor_x, cursor_y; |
| 111 | int cursor_hot_x, cursor_hot_y; |
| 112 | } G2MContext; |
| 113 | |
| 114 | static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table, |
| 115 | const uint8_t *val_table, int nb_codes, |
| 116 | int is_ac) |
| 117 | { |
| 118 | uint8_t huff_size[256] = { 0 }; |
| 119 | uint16_t huff_code[256]; |
| 120 | uint16_t huff_sym[256]; |
| 121 | int i; |
| 122 | |
| 123 | ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table); |
| 124 | |
| 125 | for (i = 0; i < 256; i++) |
| 126 | huff_sym[i] = i + 16 * is_ac; |
| 127 | |
| 128 | if (is_ac) |
| 129 | huff_sym[0] = 16 * 256; |
| 130 | |
| 131 | return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, |
| 132 | huff_code, 2, 2, huff_sym, 2, 2, 0); |
| 133 | } |
| 134 | |
| 135 | static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c) |
| 136 | { |
| 137 | int ret; |
| 138 | |
| 139 | ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance, |
| 140 | avpriv_mjpeg_val_dc, 12, 0); |
| 141 | if (ret) |
| 142 | return ret; |
| 143 | ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance, |
| 144 | avpriv_mjpeg_val_dc, 12, 0); |
| 145 | if (ret) |
| 146 | return ret; |
| 147 | ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance, |
| 148 | avpriv_mjpeg_val_ac_luminance, 251, 1); |
| 149 | if (ret) |
| 150 | return ret; |
| 151 | ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance, |
| 152 | avpriv_mjpeg_val_ac_chrominance, 251, 1); |
| 153 | if (ret) |
| 154 | return ret; |
| 155 | |
| 156 | ff_blockdsp_init(&c->bdsp, avctx); |
| 157 | ff_idctdsp_init(&c->idsp, avctx); |
| 158 | ff_init_scantable(c->idsp.idct_permutation, &c->scantable, |
| 159 | ff_zigzag_direct); |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static av_cold void jpg_free_context(JPGContext *ctx) |
| 165 | { |
| 166 | int i; |
| 167 | |
| 168 | for (i = 0; i < 2; i++) { |
| 169 | ff_free_vlc(&ctx->dc_vlc[i]); |
| 170 | ff_free_vlc(&ctx->ac_vlc[i]); |
| 171 | } |
| 172 | |
| 173 | av_freep(&ctx->buf); |
| 174 | } |
| 175 | |
| 176 | static void jpg_unescape(const uint8_t *src, int src_size, |
| 177 | uint8_t *dst, int *dst_size) |
| 178 | { |
| 179 | const uint8_t *src_end = src + src_size; |
| 180 | uint8_t *dst_start = dst; |
| 181 | |
| 182 | while (src < src_end) { |
| 183 | uint8_t x = *src++; |
| 184 | |
| 185 | *dst++ = x; |
| 186 | |
| 187 | if (x == 0xFF && !*src) |
| 188 | src++; |
| 189 | } |
| 190 | *dst_size = dst - dst_start; |
| 191 | } |
| 192 | |
| 193 | static int jpg_decode_block(JPGContext *c, GetBitContext *gb, |
| 194 | int plane, int16_t *block) |
| 195 | { |
| 196 | int dc, val, pos; |
| 197 | const int is_chroma = !!plane; |
| 198 | const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant; |
| 199 | |
| 200 | c->bdsp.clear_block(block); |
| 201 | dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3); |
| 202 | if (dc < 0) |
| 203 | return AVERROR_INVALIDDATA; |
| 204 | if (dc) |
| 205 | dc = get_xbits(gb, dc); |
| 206 | dc = dc * qmat[0] + c->prev_dc[plane]; |
| 207 | block[0] = dc; |
| 208 | c->prev_dc[plane] = dc; |
| 209 | |
| 210 | pos = 0; |
| 211 | while (pos < 63) { |
| 212 | val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3); |
| 213 | if (val < 0) |
| 214 | return AVERROR_INVALIDDATA; |
| 215 | pos += val >> 4; |
| 216 | val &= 0xF; |
| 217 | if (pos > 63) |
| 218 | return val ? AVERROR_INVALIDDATA : 0; |
| 219 | if (val) { |
| 220 | int nbits = val; |
| 221 | |
| 222 | val = get_xbits(gb, nbits); |
| 223 | val *= qmat[ff_zigzag_direct[pos]]; |
| 224 | block[c->scantable.permutated[pos]] = val; |
| 225 | } |
| 226 | } |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | static inline void yuv2rgb(uint8_t *out, int Y, int U, int V) |
| 231 | { |
| 232 | out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16)); |
| 233 | out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16)); |
| 234 | out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16)); |
| 235 | } |
| 236 | |
| 237 | static int jpg_decode_data(JPGContext *c, int width, int height, |
| 238 | const uint8_t *src, int src_size, |
| 239 | uint8_t *dst, int dst_stride, |
| 240 | const uint8_t *mask, int mask_stride, int num_mbs, |
| 241 | int swapuv) |
| 242 | { |
| 243 | GetBitContext gb; |
| 244 | int mb_w, mb_h, mb_x, mb_y, i, j; |
| 245 | int bx, by; |
| 246 | int unesc_size; |
| 247 | int ret; |
| 248 | |
| 249 | if ((ret = av_reallocp(&c->buf, |
| 250 | src_size + FF_INPUT_BUFFER_PADDING_SIZE)) < 0) |
| 251 | return ret; |
| 252 | jpg_unescape(src, src_size, c->buf, &unesc_size); |
| 253 | memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
| 254 | init_get_bits(&gb, c->buf, unesc_size * 8); |
| 255 | |
| 256 | width = FFALIGN(width, 16); |
| 257 | mb_w = width >> 4; |
| 258 | mb_h = (height + 15) >> 4; |
| 259 | |
| 260 | if (!num_mbs) |
| 261 | num_mbs = mb_w * mb_h * 4; |
| 262 | |
| 263 | for (i = 0; i < 3; i++) |
| 264 | c->prev_dc[i] = 1024; |
| 265 | bx = by = 0; |
| 266 | c->bdsp.clear_blocks(c->block[0]); |
| 267 | for (mb_y = 0; mb_y < mb_h; mb_y++) { |
| 268 | for (mb_x = 0; mb_x < mb_w; mb_x++) { |
| 269 | if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] && |
| 270 | !mask[mb_x * 2 + mask_stride] && |
| 271 | !mask[mb_x * 2 + 1 + mask_stride]) { |
| 272 | bx += 16; |
| 273 | continue; |
| 274 | } |
| 275 | for (j = 0; j < 2; j++) { |
| 276 | for (i = 0; i < 2; i++) { |
| 277 | if (mask && !mask[mb_x * 2 + i + j * mask_stride]) |
| 278 | continue; |
| 279 | num_mbs--; |
| 280 | if ((ret = jpg_decode_block(c, &gb, 0, |
| 281 | c->block[i + j * 2])) != 0) |
| 282 | return ret; |
| 283 | c->idsp.idct(c->block[i + j * 2]); |
| 284 | } |
| 285 | } |
| 286 | for (i = 1; i < 3; i++) { |
| 287 | if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0) |
| 288 | return ret; |
| 289 | c->idsp.idct(c->block[i + 3]); |
| 290 | } |
| 291 | |
| 292 | for (j = 0; j < 16; j++) { |
| 293 | uint8_t *out = dst + bx * 3 + (by + j) * dst_stride; |
| 294 | for (i = 0; i < 16; i++) { |
| 295 | int Y, U, V; |
| 296 | |
| 297 | Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8]; |
| 298 | U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128; |
| 299 | V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128; |
| 300 | yuv2rgb(out + i * 3, Y, U, V); |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | if (!num_mbs) |
| 305 | return 0; |
| 306 | bx += 16; |
| 307 | } |
| 308 | bx = 0; |
| 309 | by += 16; |
| 310 | if (mask) |
| 311 | mask += mask_stride * 2; |
| 312 | } |
| 313 | |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | static void kempf_restore_buf(const uint8_t *src, int len, |
| 318 | uint8_t *dst, int stride, |
| 319 | const uint8_t *jpeg_tile, int tile_stride, |
| 320 | int width, int height, |
| 321 | const uint8_t *pal, int npal, int tidx) |
| 322 | { |
| 323 | GetBitContext gb; |
| 324 | int i, j, nb, col; |
| 325 | |
| 326 | init_get_bits(&gb, src, len * 8); |
| 327 | |
| 328 | if (npal <= 2) nb = 1; |
| 329 | else if (npal <= 4) nb = 2; |
| 330 | else if (npal <= 16) nb = 4; |
| 331 | else nb = 8; |
| 332 | |
| 333 | for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) { |
| 334 | if (get_bits(&gb, 8)) |
| 335 | continue; |
| 336 | for (i = 0; i < width; i++) { |
| 337 | col = get_bits(&gb, nb); |
| 338 | if (col != tidx) |
| 339 | memcpy(dst + i * 3, pal + col * 3, 3); |
| 340 | else |
| 341 | memcpy(dst + i * 3, jpeg_tile + i * 3, 3); |
| 342 | } |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y, |
| 347 | const uint8_t *src, int src_size) |
| 348 | { |
| 349 | int width, height; |
| 350 | int hdr, zsize, npal, tidx = -1, ret; |
| 351 | int i, j; |
| 352 | const uint8_t *src_end = src + src_size; |
| 353 | uint8_t pal[768], transp[3]; |
| 354 | uLongf dlen = (c->tile_width + 1) * c->tile_height; |
| 355 | int sub_type; |
| 356 | int nblocks, cblocks, bstride; |
| 357 | int bits, bitbuf, coded; |
| 358 | uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 + |
| 359 | tile_y * c->tile_height * c->framebuf_stride; |
| 360 | |
| 361 | if (src_size < 2) |
| 362 | return AVERROR_INVALIDDATA; |
| 363 | |
| 364 | width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width); |
| 365 | height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height); |
| 366 | |
| 367 | hdr = *src++; |
| 368 | sub_type = hdr >> 5; |
| 369 | if (sub_type == 0) { |
| 370 | int j; |
| 371 | memcpy(transp, src, 3); |
| 372 | src += 3; |
| 373 | for (j = 0; j < height; j++, dst += c->framebuf_stride) |
| 374 | for (i = 0; i < width; i++) |
| 375 | memcpy(dst + i * 3, transp, 3); |
| 376 | return 0; |
| 377 | } else if (sub_type == 1) { |
| 378 | return jpg_decode_data(&c->jc, width, height, src, src_end - src, |
| 379 | dst, c->framebuf_stride, NULL, 0, 0, 0); |
| 380 | } |
| 381 | |
| 382 | if (sub_type != 2) { |
| 383 | memcpy(transp, src, 3); |
| 384 | src += 3; |
| 385 | } |
| 386 | npal = *src++ + 1; |
| 387 | if (src_end - src < npal * 3) |
| 388 | return AVERROR_INVALIDDATA; |
| 389 | memcpy(pal, src, npal * 3); |
| 390 | src += npal * 3; |
| 391 | if (sub_type != 2) { |
| 392 | for (i = 0; i < npal; i++) { |
| 393 | if (!memcmp(pal + i * 3, transp, 3)) { |
| 394 | tidx = i; |
| 395 | break; |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | if (src_end - src < 2) |
| 401 | return 0; |
| 402 | zsize = (src[0] << 8) | src[1]; |
| 403 | src += 2; |
| 404 | |
| 405 | if (src_end - src < zsize + (sub_type != 2)) |
| 406 | return AVERROR_INVALIDDATA; |
| 407 | |
| 408 | ret = uncompress(c->kempf_buf, &dlen, src, zsize); |
| 409 | if (ret) |
| 410 | return AVERROR_INVALIDDATA; |
| 411 | src += zsize; |
| 412 | |
| 413 | if (sub_type == 2) { |
| 414 | kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride, |
| 415 | NULL, 0, width, height, pal, npal, tidx); |
| 416 | return 0; |
| 417 | } |
| 418 | |
| 419 | nblocks = *src++ + 1; |
| 420 | cblocks = 0; |
| 421 | bstride = FFALIGN(width, 16) >> 3; |
| 422 | // blocks are coded LSB and we need normal bitreader for JPEG data |
| 423 | bits = 0; |
| 424 | for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) { |
| 425 | for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) { |
| 426 | if (!bits) { |
| 427 | if (src >= src_end) |
| 428 | return AVERROR_INVALIDDATA; |
| 429 | bitbuf = *src++; |
| 430 | bits = 8; |
| 431 | } |
| 432 | coded = bitbuf & 1; |
| 433 | bits--; |
| 434 | bitbuf >>= 1; |
| 435 | cblocks += coded; |
| 436 | if (cblocks > nblocks) |
| 437 | return AVERROR_INVALIDDATA; |
| 438 | c->kempf_flags[j * 2 + i * 2 * bstride] = |
| 439 | c->kempf_flags[j * 2 + 1 + i * 2 * bstride] = |
| 440 | c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] = |
| 441 | c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded; |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | memset(c->jpeg_tile, 0, c->tile_stride * height); |
| 446 | jpg_decode_data(&c->jc, width, height, src, src_end - src, |
| 447 | c->jpeg_tile, c->tile_stride, |
| 448 | c->kempf_flags, bstride, nblocks * 4, 0); |
| 449 | |
| 450 | kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride, |
| 451 | c->jpeg_tile, c->tile_stride, |
| 452 | width, height, pal, npal, tidx); |
| 453 | |
| 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | static int g2m_init_buffers(G2MContext *c) |
| 458 | { |
| 459 | int aligned_height; |
| 460 | |
| 461 | if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) { |
| 462 | c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3; |
| 463 | aligned_height = c->height + 15; |
| 464 | av_free(c->framebuf); |
| 465 | c->framebuf = av_mallocz(c->framebuf_stride * aligned_height); |
| 466 | if (!c->framebuf) |
| 467 | return AVERROR(ENOMEM); |
| 468 | } |
| 469 | if (!c->synth_tile || !c->jpeg_tile || |
| 470 | c->old_tile_w < c->tile_width || |
| 471 | c->old_tile_h < c->tile_height) { |
| 472 | c->tile_stride = FFALIGN(c->tile_width, 16) * 3; |
| 473 | aligned_height = FFALIGN(c->tile_height, 16); |
| 474 | av_free(c->synth_tile); |
| 475 | av_free(c->jpeg_tile); |
| 476 | av_free(c->kempf_buf); |
| 477 | av_free(c->kempf_flags); |
| 478 | c->synth_tile = av_mallocz(c->tile_stride * aligned_height); |
| 479 | c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height); |
| 480 | c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height |
| 481 | + FF_INPUT_BUFFER_PADDING_SIZE); |
| 482 | c->kempf_flags = av_mallocz( c->tile_width * aligned_height); |
| 483 | if (!c->synth_tile || !c->jpeg_tile || |
| 484 | !c->kempf_buf || !c->kempf_flags) |
| 485 | return AVERROR(ENOMEM); |
| 486 | } |
| 487 | |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c, |
| 492 | GetByteContext *gb) |
| 493 | { |
| 494 | int i, j, k; |
| 495 | uint8_t *dst; |
| 496 | uint32_t bits; |
| 497 | uint32_t cur_size, cursor_w, cursor_h, cursor_stride; |
| 498 | uint32_t cursor_hot_x, cursor_hot_y; |
| 499 | int cursor_fmt, err; |
| 500 | |
| 501 | cur_size = bytestream2_get_be32(gb); |
| 502 | cursor_w = bytestream2_get_byte(gb); |
| 503 | cursor_h = bytestream2_get_byte(gb); |
| 504 | cursor_hot_x = bytestream2_get_byte(gb); |
| 505 | cursor_hot_y = bytestream2_get_byte(gb); |
| 506 | cursor_fmt = bytestream2_get_byte(gb); |
| 507 | |
| 508 | cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4; |
| 509 | |
| 510 | if (cursor_w < 1 || cursor_w > 256 || |
| 511 | cursor_h < 1 || cursor_h > 256) { |
| 512 | av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n", |
| 513 | cursor_w, cursor_h); |
| 514 | return AVERROR_INVALIDDATA; |
| 515 | } |
| 516 | if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) { |
| 517 | av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n", |
| 518 | cursor_hot_x, cursor_hot_y); |
| 519 | cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1); |
| 520 | cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1); |
| 521 | } |
| 522 | if (cur_size - 9 > bytestream2_get_bytes_left(gb) || |
| 523 | c->cursor_w * c->cursor_h / 4 > cur_size) { |
| 524 | av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n", |
| 525 | cur_size, bytestream2_get_bytes_left(gb)); |
| 526 | return AVERROR_INVALIDDATA; |
| 527 | } |
| 528 | if (cursor_fmt != 1 && cursor_fmt != 32) { |
| 529 | avpriv_report_missing_feature(avctx, "Cursor format %d", |
| 530 | cursor_fmt); |
| 531 | return AVERROR_PATCHWELCOME; |
| 532 | } |
| 533 | |
| 534 | if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) { |
| 535 | av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n"); |
| 536 | return err; |
| 537 | } |
| 538 | |
| 539 | c->cursor_w = cursor_w; |
| 540 | c->cursor_h = cursor_h; |
| 541 | c->cursor_hot_x = cursor_hot_x; |
| 542 | c->cursor_hot_y = cursor_hot_y; |
| 543 | c->cursor_fmt = cursor_fmt; |
| 544 | c->cursor_stride = cursor_stride; |
| 545 | |
| 546 | dst = c->cursor; |
| 547 | switch (c->cursor_fmt) { |
| 548 | case 1: // old monochrome |
| 549 | for (j = 0; j < c->cursor_h; j++) { |
| 550 | for (i = 0; i < c->cursor_w; i += 32) { |
| 551 | bits = bytestream2_get_be32(gb); |
| 552 | for (k = 0; k < 32; k++) { |
| 553 | dst[0] = !!(bits & 0x80000000); |
| 554 | dst += 4; |
| 555 | bits <<= 1; |
| 556 | } |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | dst = c->cursor; |
| 561 | for (j = 0; j < c->cursor_h; j++) { |
| 562 | for (i = 0; i < c->cursor_w; i += 32) { |
| 563 | bits = bytestream2_get_be32(gb); |
| 564 | for (k = 0; k < 32; k++) { |
| 565 | int mask_bit = !!(bits & 0x80000000); |
| 566 | switch (dst[0] * 2 + mask_bit) { |
| 567 | case 0: |
| 568 | dst[0] = 0xFF; |
| 569 | dst[1] = 0x00; |
| 570 | dst[2] = 0x00; |
| 571 | dst[3] = 0x00; |
| 572 | break; |
| 573 | case 1: |
| 574 | dst[0] = 0xFF; |
| 575 | dst[1] = 0xFF; |
| 576 | dst[2] = 0xFF; |
| 577 | dst[3] = 0xFF; |
| 578 | break; |
| 579 | default: |
| 580 | dst[0] = 0x00; |
| 581 | dst[1] = 0x00; |
| 582 | dst[2] = 0x00; |
| 583 | dst[3] = 0x00; |
| 584 | } |
| 585 | dst += 4; |
| 586 | bits <<= 1; |
| 587 | } |
| 588 | } |
| 589 | } |
| 590 | break; |
| 591 | case 32: // full colour |
| 592 | /* skip monochrome version of the cursor and decode RGBA instead */ |
| 593 | bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3)); |
| 594 | for (j = 0; j < c->cursor_h; j++) { |
| 595 | for (i = 0; i < c->cursor_w; i++) { |
| 596 | int val = bytestream2_get_be32(gb); |
| 597 | *dst++ = val >> 0; |
| 598 | *dst++ = val >> 8; |
| 599 | *dst++ = val >> 16; |
| 600 | *dst++ = val >> 24; |
| 601 | } |
| 602 | } |
| 603 | break; |
| 604 | default: |
| 605 | return AVERROR_PATCHWELCOME; |
| 606 | } |
| 607 | return 0; |
| 608 | } |
| 609 | |
| 610 | #define APPLY_ALPHA(src, new, alpha) \ |
| 611 | src = (src * (256 - alpha) + new * alpha) >> 8 |
| 612 | |
| 613 | static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride) |
| 614 | { |
| 615 | int i, j; |
| 616 | int x, y, w, h; |
| 617 | const uint8_t *cursor; |
| 618 | |
| 619 | if (!c->cursor) |
| 620 | return; |
| 621 | |
| 622 | x = c->cursor_x - c->cursor_hot_x; |
| 623 | y = c->cursor_y - c->cursor_hot_y; |
| 624 | |
| 625 | cursor = c->cursor; |
| 626 | w = c->cursor_w; |
| 627 | h = c->cursor_h; |
| 628 | |
| 629 | if (x + w > c->width) |
| 630 | w = c->width - x; |
| 631 | if (y + h > c->height) |
| 632 | h = c->height - y; |
| 633 | if (x < 0) { |
| 634 | w += x; |
| 635 | cursor += -x * 4; |
| 636 | } else { |
| 637 | dst += x * 3; |
| 638 | } |
| 639 | if (y < 0) { |
| 640 | h += y; |
| 641 | cursor += -y * c->cursor_stride; |
| 642 | } else { |
| 643 | dst += y * stride; |
| 644 | } |
| 645 | if (w < 0 || h < 0) |
| 646 | return; |
| 647 | |
| 648 | for (j = 0; j < h; j++) { |
| 649 | for (i = 0; i < w; i++) { |
| 650 | uint8_t alpha = cursor[i * 4]; |
| 651 | APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha); |
| 652 | APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha); |
| 653 | APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha); |
| 654 | } |
| 655 | dst += stride; |
| 656 | cursor += c->cursor_stride; |
| 657 | } |
| 658 | } |
| 659 | |
| 660 | static int g2m_decode_frame(AVCodecContext *avctx, void *data, |
| 661 | int *got_picture_ptr, AVPacket *avpkt) |
| 662 | { |
| 663 | const uint8_t *buf = avpkt->data; |
| 664 | int buf_size = avpkt->size; |
| 665 | G2MContext *c = avctx->priv_data; |
| 666 | AVFrame *pic = data; |
| 667 | GetByteContext bc, tbc; |
| 668 | int magic; |
| 669 | int got_header = 0; |
| 670 | uint32_t chunk_size, r_mask, g_mask, b_mask; |
| 671 | int chunk_type, chunk_start; |
| 672 | int i; |
| 673 | int ret; |
| 674 | |
| 675 | if (buf_size < 12) { |
| 676 | av_log(avctx, AV_LOG_ERROR, |
| 677 | "Frame should have at least 12 bytes, got %d instead\n", |
| 678 | buf_size); |
| 679 | return AVERROR_INVALIDDATA; |
| 680 | } |
| 681 | |
| 682 | bytestream2_init(&bc, buf, buf_size); |
| 683 | |
| 684 | magic = bytestream2_get_be32(&bc); |
| 685 | if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') || |
| 686 | (magic & 0xF) < 2 || (magic & 0xF) > 4) { |
| 687 | av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic); |
| 688 | return AVERROR_INVALIDDATA; |
| 689 | } |
| 690 | |
| 691 | if ((magic & 0xF) != 4) { |
| 692 | av_log(avctx, AV_LOG_ERROR, "G2M2 and G2M3 are not yet supported\n"); |
| 693 | return AVERROR(ENOSYS); |
| 694 | } |
| 695 | |
| 696 | while (bytestream2_get_bytes_left(&bc) > 5) { |
| 697 | chunk_size = bytestream2_get_le32(&bc) - 1; |
| 698 | chunk_type = bytestream2_get_byte(&bc); |
| 699 | chunk_start = bytestream2_tell(&bc); |
| 700 | if (chunk_size > bytestream2_get_bytes_left(&bc)) { |
| 701 | av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n", |
| 702 | chunk_size, chunk_type); |
| 703 | break; |
| 704 | } |
| 705 | switch (chunk_type) { |
| 706 | case DISPLAY_INFO: |
| 707 | got_header = |
| 708 | c->got_header = 0; |
| 709 | if (chunk_size < 21) { |
| 710 | av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n", |
| 711 | chunk_size); |
| 712 | break; |
| 713 | } |
| 714 | c->width = bytestream2_get_be32(&bc); |
| 715 | c->height = bytestream2_get_be32(&bc); |
| 716 | if (c->width < 16 || c->width > c->orig_width || |
| 717 | c->height < 16 || c->height > c->orig_height) { |
| 718 | av_log(avctx, AV_LOG_ERROR, |
| 719 | "Invalid frame dimensions %dx%d\n", |
| 720 | c->width, c->height); |
| 721 | ret = AVERROR_INVALIDDATA; |
| 722 | goto header_fail; |
| 723 | } |
| 724 | if (c->width != avctx->width || c->height != avctx->height) { |
| 725 | ret = ff_set_dimensions(avctx, c->width, c->height); |
| 726 | if (ret < 0) |
| 727 | goto header_fail; |
| 728 | } |
| 729 | c->compression = bytestream2_get_be32(&bc); |
| 730 | if (c->compression != 2 && c->compression != 3) { |
| 731 | av_log(avctx, AV_LOG_ERROR, |
| 732 | "Unknown compression method %d\n", |
| 733 | c->compression); |
| 734 | ret = AVERROR_PATCHWELCOME; |
| 735 | goto header_fail; |
| 736 | } |
| 737 | c->tile_width = bytestream2_get_be32(&bc); |
| 738 | c->tile_height = bytestream2_get_be32(&bc); |
| 739 | if (c->tile_width <= 0 || c->tile_height <= 0 || |
| 740 | ((c->tile_width | c->tile_height) & 0xF) || |
| 741 | c->tile_width * 4LL * c->tile_height >= INT_MAX |
| 742 | ) { |
| 743 | av_log(avctx, AV_LOG_ERROR, |
| 744 | "Invalid tile dimensions %dx%d\n", |
| 745 | c->tile_width, c->tile_height); |
| 746 | ret = AVERROR_INVALIDDATA; |
| 747 | goto header_fail; |
| 748 | } |
| 749 | c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width; |
| 750 | c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height; |
| 751 | c->bpp = bytestream2_get_byte(&bc); |
| 752 | if (c->bpp == 32) { |
| 753 | if (bytestream2_get_bytes_left(&bc) < 16 || |
| 754 | (chunk_size - 21) < 16) { |
| 755 | av_log(avctx, AV_LOG_ERROR, |
| 756 | "Display info: missing bitmasks!\n"); |
| 757 | ret = AVERROR_INVALIDDATA; |
| 758 | goto header_fail; |
| 759 | } |
| 760 | r_mask = bytestream2_get_be32(&bc); |
| 761 | g_mask = bytestream2_get_be32(&bc); |
| 762 | b_mask = bytestream2_get_be32(&bc); |
| 763 | if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) { |
| 764 | av_log(avctx, AV_LOG_ERROR, |
| 765 | "Invalid or unsupported bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32"\n", |
| 766 | r_mask, g_mask, b_mask); |
| 767 | ret = AVERROR_PATCHWELCOME; |
| 768 | goto header_fail; |
| 769 | } |
| 770 | } else { |
| 771 | avpriv_request_sample(avctx, "bpp=%d", c->bpp); |
| 772 | ret = AVERROR_PATCHWELCOME; |
| 773 | goto header_fail; |
| 774 | } |
| 775 | if (g2m_init_buffers(c)) { |
| 776 | ret = AVERROR(ENOMEM); |
| 777 | goto header_fail; |
| 778 | } |
| 779 | got_header = 1; |
| 780 | break; |
| 781 | case TILE_DATA: |
| 782 | if (!c->tiles_x || !c->tiles_y) { |
| 783 | av_log(avctx, AV_LOG_WARNING, |
| 784 | "No display info - skipping tile\n"); |
| 785 | break; |
| 786 | } |
| 787 | if (chunk_size < 2) { |
| 788 | av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n", |
| 789 | chunk_size); |
| 790 | break; |
| 791 | } |
| 792 | c->tile_x = bytestream2_get_byte(&bc); |
| 793 | c->tile_y = bytestream2_get_byte(&bc); |
| 794 | if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) { |
| 795 | av_log(avctx, AV_LOG_ERROR, |
| 796 | "Invalid tile pos %d,%d (in %dx%d grid)\n", |
| 797 | c->tile_x, c->tile_y, c->tiles_x, c->tiles_y); |
| 798 | break; |
| 799 | } |
| 800 | ret = 0; |
| 801 | switch (c->compression) { |
| 802 | case COMPR_EPIC_J_B: |
| 803 | av_log(avctx, AV_LOG_ERROR, |
| 804 | "ePIC j-b compression is not implemented yet\n"); |
| 805 | return AVERROR(ENOSYS); |
| 806 | case COMPR_KEMPF_J_B: |
| 807 | ret = kempf_decode_tile(c, c->tile_x, c->tile_y, |
| 808 | buf + bytestream2_tell(&bc), |
| 809 | chunk_size - 2); |
| 810 | break; |
| 811 | } |
| 812 | if (ret && c->framebuf) |
| 813 | av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n", |
| 814 | c->tile_x, c->tile_y); |
| 815 | break; |
| 816 | case CURSOR_POS: |
| 817 | if (chunk_size < 5) { |
| 818 | av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n", |
| 819 | chunk_size); |
| 820 | break; |
| 821 | } |
| 822 | c->cursor_x = bytestream2_get_be16(&bc); |
| 823 | c->cursor_y = bytestream2_get_be16(&bc); |
| 824 | break; |
| 825 | case CURSOR_SHAPE: |
| 826 | if (chunk_size < 8) { |
| 827 | av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n", |
| 828 | chunk_size); |
| 829 | break; |
| 830 | } |
| 831 | bytestream2_init(&tbc, buf + bytestream2_tell(&bc), |
| 832 | chunk_size - 4); |
| 833 | g2m_load_cursor(avctx, c, &tbc); |
| 834 | break; |
| 835 | case CHUNK_CC: |
| 836 | case CHUNK_CD: |
| 837 | break; |
| 838 | default: |
| 839 | av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n", |
| 840 | chunk_type); |
| 841 | } |
| 842 | |
| 843 | /* navigate to next chunk */ |
| 844 | bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc)); |
| 845 | } |
| 846 | if (got_header) |
| 847 | c->got_header = 1; |
| 848 | |
| 849 | if (c->width && c->height && c->framebuf) { |
| 850 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
| 851 | return ret; |
| 852 | |
| 853 | pic->key_frame = got_header; |
| 854 | pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
| 855 | |
| 856 | for (i = 0; i < avctx->height; i++) |
| 857 | memcpy(pic->data[0] + i * pic->linesize[0], |
| 858 | c->framebuf + i * c->framebuf_stride, |
| 859 | c->width * 3); |
| 860 | g2m_paint_cursor(c, pic->data[0], pic->linesize[0]); |
| 861 | |
| 862 | *got_picture_ptr = 1; |
| 863 | } |
| 864 | |
| 865 | return buf_size; |
| 866 | |
| 867 | header_fail: |
| 868 | c->width = |
| 869 | c->height = 0; |
| 870 | c->tiles_x = |
| 871 | c->tiles_y = 0; |
| 872 | return ret; |
| 873 | } |
| 874 | |
| 875 | static av_cold int g2m_decode_init(AVCodecContext *avctx) |
| 876 | { |
| 877 | G2MContext *const c = avctx->priv_data; |
| 878 | int ret; |
| 879 | |
| 880 | if ((ret = jpg_init(avctx, &c->jc)) != 0) { |
| 881 | av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n"); |
| 882 | jpg_free_context(&c->jc); |
| 883 | return AVERROR(ENOMEM); |
| 884 | } |
| 885 | |
| 886 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| 887 | |
| 888 | // store original sizes and check against those if resize happens |
| 889 | c->orig_width = avctx->width; |
| 890 | c->orig_height = avctx->height; |
| 891 | |
| 892 | return 0; |
| 893 | } |
| 894 | |
| 895 | static av_cold int g2m_decode_end(AVCodecContext *avctx) |
| 896 | { |
| 897 | G2MContext *const c = avctx->priv_data; |
| 898 | |
| 899 | jpg_free_context(&c->jc); |
| 900 | |
| 901 | av_freep(&c->kempf_buf); |
| 902 | av_freep(&c->kempf_flags); |
| 903 | av_freep(&c->synth_tile); |
| 904 | av_freep(&c->jpeg_tile); |
| 905 | av_freep(&c->cursor); |
| 906 | av_freep(&c->framebuf); |
| 907 | |
| 908 | return 0; |
| 909 | } |
| 910 | |
| 911 | AVCodec ff_g2m_decoder = { |
| 912 | .name = "g2m", |
| 913 | .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"), |
| 914 | .type = AVMEDIA_TYPE_VIDEO, |
| 915 | .id = AV_CODEC_ID_G2M, |
| 916 | .priv_data_size = sizeof(G2MContext), |
| 917 | .init = g2m_decode_init, |
| 918 | .close = g2m_decode_end, |
| 919 | .decode = g2m_decode_frame, |
| 920 | .capabilities = CODEC_CAP_DR1, |
| 921 | }; |