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Revision 1.4 - (view) (download)
| 1 : | Isibaar | 1.1 | /****************************************************************************** |
| 2 : | * * | ||
| 3 : | * This file is part of XviD, a free MPEG-4 video encoder/decoder * | ||
| 4 : | * * | ||
| 5 : | * XviD is an implementation of a part of one or more MPEG-4 Video tools * | ||
| 6 : | * as specified in ISO/IEC 14496-2 standard. Those intending to use this * | ||
| 7 : | * software module in hardware or software products are advised that its * | ||
| 8 : | * use may infringe existing patents or copyrights, and any such use * | ||
| 9 : | * would be at such party's own risk. The original developer of this * | ||
| 10 : | * software module and his/her company, and subsequent editors and their * | ||
| 11 : | * companies, will have no liability for use of this software or * | ||
| 12 : | * modifications or derivatives thereof. * | ||
| 13 : | * * | ||
| 14 : | * XviD is free software; you can redistribute it and/or modify it * | ||
| 15 : | * under the terms of the GNU General Public License as published by * | ||
| 16 : | * the Free Software Foundation; either version 2 of the License, or * | ||
| 17 : | * (at your option) any later version. * | ||
| 18 : | * * | ||
| 19 : | * XviD is distributed in the hope that it will be useful, but * | ||
| 20 : | * WITHOUT ANY WARRANTY; without even the implied warranty of * | ||
| 21 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | ||
| 22 : | * GNU General Public License for more details. * | ||
| 23 : | * * | ||
| 24 : | * You should have received a copy of the GNU General Public License * | ||
| 25 : | * along with this program; if not, write to the Free Software * | ||
| 26 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * | ||
| 27 : | * * | ||
| 28 : | ******************************************************************************/ | ||
| 29 : | |||
| 30 : | /****************************************************************************** | ||
| 31 : | * * | ||
| 32 : | * bitstream.c * | ||
| 33 : | * * | ||
| 34 : | * Copyright (C) 2001 - Peter Ross <pross@cs.rmit.edu.au> * | ||
| 35 : | * * | ||
| 36 : | * For more information visit the XviD homepage: http://www.xvid.org * | ||
| 37 : | * * | ||
| 38 : | ******************************************************************************/ | ||
| 39 : | |||
| 40 : | /****************************************************************************** | ||
| 41 : | * * | ||
| 42 : | * Revision history: * | ||
| 43 : | * * | ||
| 44 : | h | 1.4 | * 26.03.2002 interlacing support |
| 45 : | Isibaar | 1.1 | * 03.03.2002 qmatrix writing * |
| 46 : | * 03.03.2002 merged BITREADER and BITWRITER * | ||
| 47 : | * 30.02.2002 intra_dc_threshold support * | ||
| 48 : | * 04.12.2001 support for additional headers * | ||
| 49 : | * 16.12.2001 inital version * | ||
| 50 : | * * | ||
| 51 : | ******************************************************************************/ | ||
| 52 : | |||
| 53 : | |||
| 54 : | #include "bitstream.h" | ||
| 55 : | #include "zigzag.h" | ||
| 56 : | Isibaar | 1.2 | #include "../quant/quant_matrix.h" |
| 57 : | Isibaar | 1.1 | |
| 58 : | static int __inline log2bin(int value) | ||
| 59 : | { | ||
| 60 : | int n = 0; | ||
| 61 : | while (value) | ||
| 62 : | { | ||
| 63 : | value >>= 1; | ||
| 64 : | n++; | ||
| 65 : | } | ||
| 66 : | return n; | ||
| 67 : | } | ||
| 68 : | |||
| 69 : | |||
| 70 : | static const uint32_t intra_dc_threshold_table[] = | ||
| 71 : | { | ||
| 72 : | 32, /* never use */ | ||
| 73 : | 13, | ||
| 74 : | 15, | ||
| 75 : | 17, | ||
| 76 : | 19, | ||
| 77 : | 21, | ||
| 78 : | 23, | ||
| 79 : | 1, | ||
| 80 : | }; | ||
| 81 : | |||
| 82 : | |||
| 83 : | Isibaar | 1.2 | void bs_get_matrix(Bitstream * bs, uint8_t * matrix) |
| 84 : | { | ||
| 85 : | int i = 0; | ||
| 86 : | int last, value = 0; | ||
| 87 : | |||
| 88 : | do | ||
| 89 : | { | ||
| 90 : | last = value; | ||
| 91 : | value = BitstreamGetBits(bs, 8); | ||
| 92 : | matrix[ scan_tables[0][i++] ] = value; | ||
| 93 : | } | ||
| 94 : | while (value != 0 && i < 64); | ||
| 95 : | |||
| 96 : | while (i < 64) | ||
| 97 : | { | ||
| 98 : | matrix[ scan_tables[0][i++] ] = last; | ||
| 99 : | } | ||
| 100 : | } | ||
| 101 : | |||
| 102 : | Isibaar | 1.1 | /* |
| 103 : | decode headers | ||
| 104 : | returns coding_type, or -1 if error | ||
| 105 : | */ | ||
| 106 : | |||
| 107 : | int BitstreamReadHeaders(Bitstream * bs, DECODER * dec, uint32_t * rounding, uint32_t * quant, uint32_t * fcode, uint32_t * intra_dc_threshold) | ||
| 108 : | { | ||
| 109 : | uint32_t vol_ver_id; | ||
| 110 : | uint32_t time_inc_resolution; | ||
| 111 : | uint32_t coding_type; | ||
| 112 : | uint32_t start_code; | ||
| 113 : | |||
| 114 : | do | ||
| 115 : | { | ||
| 116 : | BitstreamByteAlign(bs); | ||
| 117 : | start_code = BitstreamShowBits(bs, 32); | ||
| 118 : | |||
| 119 : | if (start_code == VISOBJSEQ_START_CODE) | ||
| 120 : | { | ||
| 121 : | // DEBUG("visual_object_sequence"); | ||
| 122 : | BitstreamSkip(bs, 32); // visual_object_sequence_start_code | ||
| 123 : | BitstreamSkip(bs, 8); // profile_and_level_indication | ||
| 124 : | } | ||
| 125 : | else if (start_code == VISOBJSEQ_STOP_CODE) | ||
| 126 : | { | ||
| 127 : | BitstreamSkip(bs, 32); // visual_object_sequence_stop_code | ||
| 128 : | } | ||
| 129 : | else if (start_code == VISOBJ_START_CODE) | ||
| 130 : | { | ||
| 131 : | // DEBUG("visual_object"); | ||
| 132 : | BitstreamSkip(bs,32); // visual_object_start_code | ||
| 133 : | if (BitstreamGetBit(bs)) // is_visual_object_identified | ||
| 134 : | { | ||
| 135 : | vol_ver_id = BitstreamGetBits(bs,4); // visual_object_ver_id | ||
| 136 : | BitstreamSkip(bs, 3); // visual_object_priority | ||
| 137 : | } | ||
| 138 : | else | ||
| 139 : | { | ||
| 140 : | vol_ver_id = 1; | ||
| 141 : | } | ||
| 142 : | |||
| 143 : | if (BitstreamShowBits(bs, 4) != VISOBJ_TYPE_VIDEO) // visual_object_type | ||
| 144 : | { | ||
| 145 : | DEBUG("visual_object_type != video"); | ||
| 146 : | return -1; | ||
| 147 : | } | ||
| 148 : | BitstreamSkip(bs, 4); | ||
| 149 : | |||
| 150 : | // video_signal_type | ||
| 151 : | |||
| 152 : | if (BitstreamGetBit(bs)) // video_signal_type | ||
| 153 : | { | ||
| 154 : | DEBUG("+ video_signal_type"); | ||
| 155 : | BitstreamSkip(bs, 3); // video_format | ||
| 156 : | BitstreamSkip(bs, 1); // video_range | ||
| 157 : | if (BitstreamGetBit(bs)) // color_description | ||
| 158 : | { | ||
| 159 : | DEBUG("+ color_description"); | ||
| 160 : | BitstreamSkip(bs, 8); // color_primaries | ||
| 161 : | BitstreamSkip(bs, 8); // transfer_characteristics | ||
| 162 : | BitstreamSkip(bs, 8); // matrix_coefficients | ||
| 163 : | } | ||
| 164 : | } | ||
| 165 : | } | ||
| 166 : | else if ((start_code & ~0x1f) == VIDOBJ_START_CODE) | ||
| 167 : | { | ||
| 168 : | BitstreamSkip(bs, 32); // video_object_start_code | ||
| 169 : | } | ||
| 170 : | else if ((start_code & ~0xf) == VIDOBJLAY_START_CODE) | ||
| 171 : | { | ||
| 172 : | // DEBUG("video_object_layer"); | ||
| 173 : | BitstreamSkip(bs, 32); // video_object_layer_start_code | ||
| 174 : | |||
| 175 : | BitstreamSkip(bs, 1); // random_accessible_vol | ||
| 176 : | |||
| 177 : | // video_object_type_indication | ||
| 178 : | if (BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_SIMPLE && | ||
| 179 : | BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_CORE && | ||
| 180 : | BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_MAIN && | ||
| 181 : | BitstreamShowBits(bs, 8) != 0) // BUGGY DIVX | ||
| 182 : | { | ||
| 183 : | DEBUG1("video_object_type_indication not supported", BitstreamShowBits(bs, 8)); | ||
| 184 : | return -1; | ||
| 185 : | } | ||
| 186 : | BitstreamSkip(bs, 8); | ||
| 187 : | |||
| 188 : | |||
| 189 : | if (BitstreamGetBit(bs)) // is_object_layer_identifier | ||
| 190 : | { | ||
| 191 : | DEBUG("+ is_object_layer_identifier"); | ||
| 192 : | vol_ver_id = BitstreamGetBits(bs,4); // video_object_layer_verid | ||
| 193 : | BitstreamSkip(bs, 3); // video_object_layer_priority | ||
| 194 : | } | ||
| 195 : | else | ||
| 196 : | { | ||
| 197 : | vol_ver_id = 1; | ||
| 198 : | } | ||
| 199 : | //DEBUGI("vol_ver_id", vol_ver_id); | ||
| 200 : | |||
| 201 : | if (BitstreamGetBits(bs, 4) == VIDOBJLAY_AR_EXTPAR) // aspect_ratio_info | ||
| 202 : | { | ||
| 203 : | DEBUG("+ aspect_ratio_info"); | ||
| 204 : | BitstreamSkip(bs, 8); // par_width | ||
| 205 : | BitstreamSkip(bs, 8); // par_height | ||
| 206 : | } | ||
| 207 : | |||
| 208 : | if (BitstreamGetBit(bs)) // vol_control_parameters | ||
| 209 : | { | ||
| 210 : | DEBUG("+ vol_control_parameters"); | ||
| 211 : | BitstreamSkip(bs, 2); // chroma_format | ||
| 212 : | BitstreamSkip(bs, 1); // low_delay | ||
| 213 : | if (BitstreamGetBit(bs)) // vbv_parameters | ||
| 214 : | { | ||
| 215 : | DEBUG("+ vbv_parameters"); | ||
| 216 : | BitstreamSkip(bs, 15); // first_half_bitrate | ||
| 217 : | READ_MARKER(); | ||
| 218 : | BitstreamSkip(bs, 15); // latter_half_bitrate | ||
| 219 : | READ_MARKER(); | ||
| 220 : | BitstreamSkip(bs, 15); // first_half_vbv_buffer_size | ||
| 221 : | READ_MARKER(); | ||
| 222 : | BitstreamSkip(bs, 3); // latter_half_vbv_buffer_size | ||
| 223 : | BitstreamSkip(bs, 11); // first_half_vbv_occupancy | ||
| 224 : | READ_MARKER(); | ||
| 225 : | BitstreamSkip(bs, 15); // latter_half_vbv_occupancy | ||
| 226 : | READ_MARKER(); | ||
| 227 : | |||
| 228 : | } | ||
| 229 : | } | ||
| 230 : | |||
| 231 : | dec->shape = BitstreamGetBits(bs, 2); // video_object_layer_shape | ||
| 232 : | // DEBUG1("shape", dec->shape); | ||
| 233 : | |||
| 234 : | if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE && vol_ver_id != 1) | ||
| 235 : | { | ||
| 236 : | BitstreamSkip(bs, 4); // video_object_layer_shape_extension | ||
| 237 : | } | ||
| 238 : | |||
| 239 : | READ_MARKER(); | ||
| 240 : | |||
| 241 : | time_inc_resolution = BitstreamGetBits(bs, 16); // vop_time_increment_resolution | ||
| 242 : | time_inc_resolution--; | ||
| 243 : | if (time_inc_resolution > 0) | ||
| 244 : | { | ||
| 245 : | dec->time_inc_bits = log2bin(time_inc_resolution); | ||
| 246 : | } | ||
| 247 : | else | ||
| 248 : | { | ||
| 249 : | // dec->time_inc_bits = 0; | ||
| 250 : | |||
| 251 : | // for "old" xvid compatibility, set time_inc_bits = 1 | ||
| 252 : | dec->time_inc_bits = 1; | ||
| 253 : | } | ||
| 254 : | |||
| 255 : | READ_MARKER(); | ||
| 256 : | |||
| 257 : | if (BitstreamGetBit(bs)) // fixed_vop_rate | ||
| 258 : | { | ||
| 259 : | BitstreamSkip(bs, dec->time_inc_bits); // fixed_vop_time_increment | ||
| 260 : | } | ||
| 261 : | |||
| 262 : | if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) | ||
| 263 : | { | ||
| 264 : | |||
| 265 : | if (dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR) | ||
| 266 : | { | ||
| 267 : | uint32_t width, height; | ||
| 268 : | |||
| 269 : | READ_MARKER(); | ||
| 270 : | width = BitstreamGetBits(bs, 13); // video_object_layer_width | ||
| 271 : | //DEBUGI("width", width); | ||
| 272 : | READ_MARKER(); | ||
| 273 : | height = BitstreamGetBits(bs, 13); // video_object_layer_height | ||
| 274 : | //DEBUGI("height", height); | ||
| 275 : | READ_MARKER(); | ||
| 276 : | |||
| 277 : | if (width != dec->width || height != dec->height) | ||
| 278 : | { | ||
| 279 : | DEBUG("FATAL: video dimension discrepancy ***"); | ||
| 280 : | DEBUG2("bitstream width/height", width, height); | ||
| 281 : | DEBUG2("param width/height", dec->width, dec->height); | ||
| 282 : | return -1; | ||
| 283 : | } | ||
| 284 : | |||
| 285 : | } | ||
| 286 : | h | 1.4 | |
| 287 : | if (dec->interlacing = BitstreamGetBit(bs)) | ||
| 288 : | Isibaar | 1.1 | { |
| 289 : | h | 1.4 | DEBUG("vol: interlacing"); |
| 290 : | Isibaar | 1.1 | } |
| 291 : | |||
| 292 : | if (!BitstreamGetBit(bs)) // obmc_disable | ||
| 293 : | { | ||
| 294 : | DEBUG("IGNORED/TODO: !obmc_disable"); | ||
| 295 : | // TODO | ||
| 296 : | // fucking divx4.02 has this enabled | ||
| 297 : | } | ||
| 298 : | |||
| 299 : | if (BitstreamGetBits(bs, (vol_ver_id == 1 ? 1 : 2))) // sprite_enable | ||
| 300 : | { | ||
| 301 : | DEBUG("sprite_enable; not supported"); | ||
| 302 : | return -1; | ||
| 303 : | } | ||
| 304 : | |||
| 305 : | if (vol_ver_id != 1 && dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) | ||
| 306 : | { | ||
| 307 : | BitstreamSkip(bs, 1); // sadct_disable | ||
| 308 : | } | ||
| 309 : | |||
| 310 : | if (BitstreamGetBit(bs)) // not_8_bit | ||
| 311 : | { | ||
| 312 : | DEBUG("+ not_8_bit [IGNORED/TODO]"); | ||
| 313 : | dec->quant_bits = BitstreamGetBits(bs, 4); // quant_precision | ||
| 314 : | BitstreamSkip(bs, 4); // bits_per_pixel | ||
| 315 : | } | ||
| 316 : | else | ||
| 317 : | { | ||
| 318 : | dec->quant_bits = 5; | ||
| 319 : | } | ||
| 320 : | |||
| 321 : | if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE) | ||
| 322 : | { | ||
| 323 : | BitstreamSkip(bs, 1); // no_gray_quant_update | ||
| 324 : | BitstreamSkip(bs, 1); // composition_method | ||
| 325 : | BitstreamSkip(bs, 1); // linear_composition | ||
| 326 : | } | ||
| 327 : | |||
| 328 : | dec->quant_type = BitstreamGetBit(bs); // quant_type | ||
| 329 : | // DEBUG1("**** quant_type", dec->quant_type); | ||
| 330 : | |||
| 331 : | if (dec->quant_type) | ||
| 332 : | { | ||
| 333 : | if (BitstreamGetBit(bs)) // load_intra_quant_mat | ||
| 334 : | { | ||
| 335 : | Isibaar | 1.3 | uint8_t matrix[64]; |
| 336 : | Isibaar | 1.2 | bs_get_matrix(bs, matrix); |
| 337 : | set_intra_matrix(matrix); | ||
| 338 : | Isibaar | 1.1 | } |
| 339 : | Isibaar | 1.3 | else |
| 340 : | set_intra_matrix(get_default_intra_matrix()); | ||
| 341 : | Isibaar | 1.2 | |
| 342 : | Isibaar | 1.1 | if (BitstreamGetBit(bs)) // load_inter_quant_mat |
| 343 : | { | ||
| 344 : | Isibaar | 1.3 | uint8_t matrix[64]; |
| 345 : | Isibaar | 1.2 | bs_get_matrix(bs, matrix); |
| 346 : | set_inter_matrix(matrix); | ||
| 347 : | Isibaar | 1.1 | } |
| 348 : | Isibaar | 1.3 | else |
| 349 : | set_inter_matrix(get_default_inter_matrix()); | ||
| 350 : | Isibaar | 1.1 | |
| 351 : | if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE) | ||
| 352 : | { | ||
| 353 : | // TODO | ||
| 354 : | DEBUG("TODO: grayscale matrix stuff"); | ||
| 355 : | return -1; | ||
| 356 : | } | ||
| 357 : | Isibaar | 1.2 | |
| 358 : | Isibaar | 1.1 | } |
| 359 : | |||
| 360 : | |||
| 361 : | if (vol_ver_id != 1) | ||
| 362 : | { | ||
| 363 : | dec->quarterpel = BitstreamGetBit(bs); // quarter_sampe | ||
| 364 : | if (dec->quarterpel) | ||
| 365 : | { | ||
| 366 : | DEBUG("IGNORED/TODO: quarter_sample"); | ||
| 367 : | } | ||
| 368 : | } | ||
| 369 : | else | ||
| 370 : | { | ||
| 371 : | dec->quarterpel = 0; | ||
| 372 : | } | ||
| 373 : | |||
| 374 : | if (!BitstreamGetBit(bs)) // complexity_estimation_disable | ||
| 375 : | { | ||
| 376 : | DEBUG("TODO: complexity_estimation header"); | ||
| 377 : | // TODO | ||
| 378 : | return -1; | ||
| 379 : | } | ||
| 380 : | |||
| 381 : | if (!BitstreamGetBit(bs)) // resync_marker_disable | ||
| 382 : | { | ||
| 383 : | DEBUG("IGNORED/TODO: !resync_marker_disable"); | ||
| 384 : | // TODO | ||
| 385 : | } | ||
| 386 : | |||
| 387 : | if (BitstreamGetBit(bs)) // data_partitioned | ||
| 388 : | { | ||
| 389 : | DEBUG("+ data_partitioned"); | ||
| 390 : | BitstreamSkip(bs, 1); // reversible_vlc | ||
| 391 : | } | ||
| 392 : | |||
| 393 : | if (vol_ver_id != 1) | ||
| 394 : | { | ||
| 395 : | if (BitstreamGetBit(bs)) // newpred_enable | ||
| 396 : | { | ||
| 397 : | DEBUG("+ newpred_enable"); | ||
| 398 : | BitstreamSkip(bs, 2); // requested_upstream_message_type | ||
| 399 : | BitstreamSkip(bs, 1); // newpred_segment_type | ||
| 400 : | } | ||
| 401 : | if (BitstreamGetBit(bs)) // reduced_resolution_vop_enable | ||
| 402 : | { | ||
| 403 : | DEBUG("TODO: reduced_resolution_vop_enable"); | ||
| 404 : | // TODO | ||
| 405 : | return -1; | ||
| 406 : | } | ||
| 407 : | } | ||
| 408 : | |||
| 409 : | if (BitstreamGetBit(bs)) // scalability | ||
| 410 : | { | ||
| 411 : | // TODO | ||
| 412 : | DEBUG("TODO: scalability"); | ||
| 413 : | return -1; | ||
| 414 : | } | ||
| 415 : | } | ||
| 416 : | else // dec->shape == BINARY_ONLY | ||
| 417 : | { | ||
| 418 : | if (vol_ver_id != 1) | ||
| 419 : | { | ||
| 420 : | if (BitstreamGetBit(bs)) // scalability | ||
| 421 : | { | ||
| 422 : | // TODO | ||
| 423 : | DEBUG("TODO: scalability"); | ||
| 424 : | return -1; | ||
| 425 : | } | ||
| 426 : | } | ||
| 427 : | BitstreamSkip(bs, 1); // resync_marker_disable | ||
| 428 : | |||
| 429 : | } | ||
| 430 : | |||
| 431 : | } | ||
| 432 : | else if (start_code == GRPOFVOP_START_CODE) | ||
| 433 : | { | ||
| 434 : | // DEBUG("group_of_vop"); | ||
| 435 : | BitstreamSkip(bs, 32); | ||
| 436 : | { | ||
| 437 : | int hours, minutes, seconds; | ||
| 438 : | hours = BitstreamGetBits(bs, 5); | ||
| 439 : | minutes = BitstreamGetBits(bs, 6); | ||
| 440 : | READ_MARKER(); | ||
| 441 : | seconds = BitstreamGetBits(bs, 6); | ||
| 442 : | // DEBUG3("hms", hours, minutes, seconds); | ||
| 443 : | } | ||
| 444 : | BitstreamSkip(bs, 1); // closed_gov | ||
| 445 : | BitstreamSkip(bs, 1); // broken_link | ||
| 446 : | } | ||
| 447 : | else if (start_code == VOP_START_CODE) | ||
| 448 : | { | ||
| 449 : | // DEBUG("vop_start_code"); | ||
| 450 : | BitstreamSkip(bs, 32); // vop_start_code | ||
| 451 : | |||
| 452 : | coding_type = BitstreamGetBits(bs, 2); // vop_coding_type | ||
| 453 : | //DEBUG1("coding_type", coding_type); | ||
| 454 : | |||
| 455 : | while (BitstreamGetBit(bs) != 0) ; // time_base | ||
| 456 : | |||
| 457 : | READ_MARKER(); | ||
| 458 : | |||
| 459 : | //DEBUG1("time_inc_bits", dec->time_inc_bits); | ||
| 460 : | //DEBUG1("vop_time_incr", BitstreamShowBits(bs, dec->time_inc_bits)); | ||
| 461 : | if (dec->time_inc_bits) | ||
| 462 : | { | ||
| 463 : | BitstreamSkip(bs, dec->time_inc_bits); // vop_time_increment | ||
| 464 : | } | ||
| 465 : | |||
| 466 : | READ_MARKER(); | ||
| 467 : | |||
| 468 : | if (!BitstreamGetBit(bs)) // vop_coded | ||
| 469 : | { | ||
| 470 : | return N_VOP; | ||
| 471 : | } | ||
| 472 : | |||
| 473 : | /* if (newpred_enable) | ||
| 474 : | { | ||
| 475 : | } | ||
| 476 : | */ | ||
| 477 : | |||
| 478 : | if (coding_type != I_VOP) | ||
| 479 : | { | ||
| 480 : | *rounding = BitstreamGetBit(bs); // rounding_type | ||
| 481 : | //DEBUG1("rounding", *rounding); | ||
| 482 : | } | ||
| 483 : | |||
| 484 : | /* if (reduced_resolution_enable) | ||
| 485 : | { | ||
| 486 : | } | ||
| 487 : | */ | ||
| 488 : | |||
| 489 : | if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) | ||
| 490 : | { | ||
| 491 : | uint32_t width, height; | ||
| 492 : | uint32_t horiz_mc_ref, vert_mc_ref; | ||
| 493 : | |||
| 494 : | width = BitstreamGetBits(bs, 13); | ||
| 495 : | READ_MARKER(); | ||
| 496 : | height = BitstreamGetBits(bs, 13); | ||
| 497 : | READ_MARKER(); | ||
| 498 : | horiz_mc_ref = BitstreamGetBits(bs, 13); | ||
| 499 : | READ_MARKER(); | ||
| 500 : | vert_mc_ref = BitstreamGetBits(bs, 13); | ||
| 501 : | READ_MARKER(); | ||
| 502 : | |||
| 503 : | // DEBUG2("vop_width/height", width, height); | ||
| 504 : | // DEBUG2("ref ", horiz_mc_ref, vert_mc_ref); | ||
| 505 : | |||
| 506 : | BitstreamSkip(bs, 1); // change_conv_ratio_disable | ||
| 507 : | if (BitstreamGetBit(bs)) // vop_constant_alpha | ||
| 508 : | { | ||
| 509 : | BitstreamSkip(bs, 8); // vop_constant_alpha_value | ||
| 510 : | } | ||
| 511 : | } | ||
| 512 : | |||
| 513 : | |||
| 514 : | if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) | ||
| 515 : | { | ||
| 516 : | // intra_dc_vlc_threshold | ||
| 517 : | *intra_dc_threshold = intra_dc_threshold_table[ BitstreamGetBits(bs,3) ]; | ||
| 518 : | |||
| 519 : | h | 1.4 | if (dec->interlacing) |
| 520 : | { | ||
| 521 : | if (dec->top_field_first = BitstreamGetBit(bs)) | ||
| 522 : | { | ||
| 523 : | DEBUG("vop: top_field_first"); | ||
| 524 : | } | ||
| 525 : | if (dec->alternate_vertical_scan = BitstreamGetBit(bs)) | ||
| 526 : | Isibaar | 1.1 | { |
| 527 : | h | 1.4 | DEBUG("vop: alternate_vertical_scan"); |
| 528 : | } | ||
| 529 : | } | ||
| 530 : | Isibaar | 1.1 | } |
| 531 : | |||
| 532 : | *quant = BitstreamGetBits(bs, dec->quant_bits); // vop_quant | ||
| 533 : | //DEBUG1("quant", *quant); | ||
| 534 : | |||
| 535 : | if (coding_type != I_VOP) | ||
| 536 : | { | ||
| 537 : | *fcode = BitstreamGetBits(bs, 3); // fcode_forward | ||
| 538 : | } | ||
| 539 : | |||
| 540 : | if (coding_type == B_VOP) | ||
| 541 : | { | ||
| 542 : | // *fcode_backward = BitstreamGetBits(bs, 3); // fcode_backward | ||
| 543 : | } | ||
| 544 : | return coding_type; | ||
| 545 : | } | ||
| 546 : | else if (start_code == USERDATA_START_CODE) | ||
| 547 : | { | ||
| 548 : | // DEBUG("user_data"); | ||
| 549 : | BitstreamSkip(bs, 32); // user_data_start_code | ||
| 550 : | } | ||
| 551 : | else // start_code == ? | ||
| 552 : | { | ||
| 553 : | if (BitstreamShowBits(bs, 24) == 0x000001) | ||
| 554 : | { | ||
| 555 : | DEBUG1("*** WARNING: unknown start_code", BitstreamShowBits(bs, 32)); | ||
| 556 : | } | ||
| 557 : | BitstreamSkip(bs, 8); | ||
| 558 : | } | ||
| 559 : | } | ||
| 560 : | while ((BitstreamPos(bs) >> 3) < bs->length); | ||
| 561 : | |||
| 562 : | DEBUG("*** WARNING: no vop_start_code found"); | ||
| 563 : | return -1; /* ignore it */ | ||
| 564 : | } | ||
| 565 : | |||
| 566 : | |||
| 567 : | /* write custom quant matrix */ | ||
| 568 : | |||
| 569 : | Isibaar | 1.2 | static void bs_put_matrix(Bitstream * bs, const int16_t *matrix) |
| 570 : | Isibaar | 1.1 | { |
| 571 : | int i, j; | ||
| 572 : | const int last = matrix[scan_tables[0][63]]; | ||
| 573 : | |||
| 574 : | for (j = 63; j >= 0 && matrix[scan_tables[0][j - 1]] == last; j--) ; | ||
| 575 : | |||
| 576 : | for (i = 0; i <= j; i++) | ||
| 577 : | { | ||
| 578 : | BitstreamPutBits(bs, matrix[scan_tables[0][i]], 8); | ||
| 579 : | } | ||
| 580 : | |||
| 581 : | if (j < 63) | ||
| 582 : | { | ||
| 583 : | BitstreamPutBits(bs, 0, 8); | ||
| 584 : | } | ||
| 585 : | } | ||
| 586 : | |||
| 587 : | |||
| 588 : | /* | ||
| 589 : | write vol header | ||
| 590 : | */ | ||
| 591 : | void BitstreamWriteVolHeader(Bitstream * const bs, | ||
| 592 : | h | 1.4 | const MBParam * pParam) |
| 593 : | Isibaar | 1.1 | { |
| 594 : | // video object_start_code & vo_id | ||
| 595 : | BitstreamPad(bs); | ||
| 596 : | BitstreamPutBits(bs, VO_START_CODE, 27); | ||
| 597 : | BitstreamPutBits(bs, 0, 5); | ||
| 598 : | |||
| 599 : | // video_object_layer_start_code & vol_id | ||
| 600 : | BitstreamPutBits(bs, VOL_START_CODE, 28); | ||
| 601 : | BitstreamPutBits(bs, 0, 4); | ||
| 602 : | |||
| 603 : | BitstreamPutBit(bs, 0); // random_accessible_vol | ||
| 604 : | BitstreamPutBits(bs, 0, 8); // video_object_type_indication | ||
| 605 : | BitstreamPutBit(bs, 0); // is_object_layer_identified (0=not given) | ||
| 606 : | BitstreamPutBits(bs, 1, 4); // aspect_ratio_info (1=1:1) | ||
| 607 : | BitstreamPutBit(bs, 0); // vol_control_parameters (0=not given) | ||
| 608 : | BitstreamPutBits(bs, 0, 2); // video_object_layer_shape (0=rectangular) | ||
| 609 : | |||
| 610 : | WRITE_MARKER(); | ||
| 611 : | |||
| 612 : | /* time_increment_resolution; ignored by current decore versions | ||
| 613 : | eg. 2fps res=2 inc=1 | ||
| 614 : | 25fps res=25 inc=1 | ||
| 615 : | 29.97fps res=30000 inc=1001 | ||
| 616 : | */ | ||
| 617 : | BitstreamPutBits(bs, 2, 16); | ||
| 618 : | |||
| 619 : | WRITE_MARKER(); | ||
| 620 : | |||
| 621 : | // fixed_vop_rate | ||
| 622 : | BitstreamPutBit(bs, 0); | ||
| 623 : | |||
| 624 : | // fixed_time_increment: value=nth_of_sec, nbits = log2(resolution) | ||
| 625 : | // BitstreamPutBits(bs, 0, 15); | ||
| 626 : | |||
| 627 : | WRITE_MARKER(); | ||
| 628 : | h | 1.4 | BitstreamPutBits(bs, pParam->width, 13); // width |
| 629 : | Isibaar | 1.1 | WRITE_MARKER(); |
| 630 : | h | 1.4 | BitstreamPutBits(bs, pParam->height, 13); // height |
| 631 : | Isibaar | 1.1 | WRITE_MARKER(); |
| 632 : | |||
| 633 : | h | 1.4 | BitstreamPutBit(bs, pParam->global_flags & XVID_INTERLACING); // interlace |
| 634 : | Isibaar | 1.1 | BitstreamPutBit(bs, 1); // obmc_disable (overlapped block motion compensation) |
| 635 : | BitstreamPutBit(bs, 0); // sprite_enable | ||
| 636 : | BitstreamPutBit(bs, 0); // not_in_bit | ||
| 637 : | |||
| 638 : | // quant_type 0=h.263 1=mpeg4(quantizer tables) | ||
| 639 : | h | 1.4 | BitstreamPutBit(bs, pParam->quant_type); |
| 640 : | Isibaar | 1.2 | |
| 641 : | h | 1.4 | if (pParam->quant_type) |
| 642 : | Isibaar | 1.1 | { |
| 643 : | Isibaar | 1.2 | BitstreamPutBit(bs, get_intra_matrix_status()); // load_intra_quant_mat |
| 644 : | if (get_intra_matrix_status()) | ||
| 645 : | Isibaar | 1.1 | { |
| 646 : | Isibaar | 1.2 | bs_put_matrix(bs, get_intra_matrix()); |
| 647 : | Isibaar | 1.1 | } |
| 648 : | |||
| 649 : | Isibaar | 1.2 | BitstreamPutBit(bs, get_inter_matrix_status()); // load_inter_quant_mat |
| 650 : | if (get_inter_matrix_status()) | ||
| 651 : | Isibaar | 1.1 | { |
| 652 : | Isibaar | 1.2 | bs_put_matrix(bs, get_inter_matrix()); |
| 653 : | Isibaar | 1.1 | } |
| 654 : | |||
| 655 : | } | ||
| 656 : | |||
| 657 : | BitstreamPutBit(bs, 1); // complexity_estimation_disable | ||
| 658 : | BitstreamPutBit(bs, 1); // resync_marker_disable | ||
| 659 : | BitstreamPutBit(bs, 0); // data_partitioned | ||
| 660 : | BitstreamPutBit(bs, 0); // scalability | ||
| 661 : | } | ||
| 662 : | |||
| 663 : | |||
| 664 : | /* | ||
| 665 : | write vop header | ||
| 666 : | |||
| 667 : | NOTE: doesnt handle bother with time_base & time_inc | ||
| 668 : | time_base = n seconds since last resync (eg. last iframe) | ||
| 669 : | time_inc = nth of a second since last resync | ||
| 670 : | (decoder uses these values to determine precise time since last resync) | ||
| 671 : | */ | ||
| 672 : | void BitstreamWriteVopHeader(Bitstream * const bs, | ||
| 673 : | h | 1.4 | const MBParam * pParam) |
| 674 : | Isibaar | 1.1 | { |
| 675 : | BitstreamPad(bs); | ||
| 676 : | BitstreamPutBits(bs, VOP_START_CODE, 32); | ||
| 677 : | |||
| 678 : | h | 1.4 | BitstreamPutBits(bs, pParam->coding_type, 2); |
| 679 : | Isibaar | 1.1 | |
| 680 : | // time_base = 0 write n x PutBit(1), PutBit(0) | ||
| 681 : | BitstreamPutBits(bs, 0, 1); | ||
| 682 : | |||
| 683 : | WRITE_MARKER(); | ||
| 684 : | |||
| 685 : | // time_increment: value=nth_of_sec, nbits = log2(resolution) | ||
| 686 : | BitstreamPutBits(bs, 1, 1); | ||
| 687 : | |||
| 688 : | WRITE_MARKER(); | ||
| 689 : | |||
| 690 : | BitstreamPutBits(bs, 1, 1); // vop_coded | ||
| 691 : | |||
| 692 : | h | 1.4 | if (pParam->coding_type != I_VOP) |
| 693 : | BitstreamPutBits(bs, pParam->rounding_type, 1); | ||
| 694 : | Isibaar | 1.1 | |
| 695 : | BitstreamPutBits(bs, 0, 3); // intra_dc_vlc_threshold | ||
| 696 : | |||
| 697 : | h | 1.4 | if (pParam->global_flags & XVID_INTERLACING) |
| 698 : | { | ||
| 699 : | BitstreamPutBit(bs, 1); // top field first | ||
| 700 : | BitstreamPutBit(bs, 0); // alternate vertical scan | ||
| 701 : | } | ||
| 702 : | |||
| 703 : | BitstreamPutBits(bs, pParam->quant, 5); // quantizer | ||
| 704 : | Isibaar | 1.1 | |
| 705 : | h | 1.4 | if (pParam->coding_type != I_VOP) |
| 706 : | BitstreamPutBits(bs, pParam->fixed_code, 3); // fixed_code = [1,4] | ||
| 707 : | Isibaar | 1.1 | } |
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