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Revision 1.10.2.3 - (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.h * | ||
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 : | suxen_drol | 1.9 | * 28.06.2002 addded BitstreamNumBitsToByteAlign() * |
45 : | * BitstreamShowBitsFromByteAlign() * | ||
46 : | * 26.03.2002 interlacing support - modified putvol/vopheaders paramters * | ||
47 : | Isibaar | 1.1 | * 04.03.2002 putbits speedup (Isibaar) * |
48 : | * 03.03.2002 merged BITREADER and BITWRITER (Isibaar) * | ||
49 : | * 16.12.2001 inital version * | ||
50 : | * * | ||
51 : | ******************************************************************************/ | ||
52 : | |||
53 : | #ifndef _BITSTREAM_H_ | ||
54 : | #define _BITSTREAM_H_ | ||
55 : | |||
56 : | #include "../portab.h" | ||
57 : | #include "../decoder.h" | ||
58 : | #include "../encoder.h" | ||
59 : | |||
60 : | // comment any #defs we dont use | ||
61 : | |||
62 : | #define VIDOBJ_START_CODE 0x00000100 /* ..0x0000011f */ | ||
63 : | #define VIDOBJLAY_START_CODE 0x00000120 /* ..0x0000012f */ | ||
64 : | #define VISOBJSEQ_START_CODE 0x000001b0 | ||
65 : | #define VISOBJSEQ_STOP_CODE 0x000001b1 /* ??? */ | ||
66 : | #define USERDATA_START_CODE 0x000001b2 | ||
67 : | #define GRPOFVOP_START_CODE 0x000001b3 | ||
68 : | edgomez | 1.6 | //#define VIDSESERR_ERROR_CODE 0x000001b4 |
69 : | Isibaar | 1.1 | #define VISOBJ_START_CODE 0x000001b5 |
70 : | edgomez | 1.6 | //#define SLICE_START_CODE 0x000001b7 |
71 : | //#define EXT_START_CODE 0x000001b8 | ||
72 : | Isibaar | 1.1 | |
73 : | |||
74 : | #define VISOBJ_TYPE_VIDEO 1 | ||
75 : | edgomez | 1.6 | //#define VISOBJ_TYPE_STILLTEXTURE 2 |
76 : | //#define VISOBJ_TYPE_MESH 3 | ||
77 : | //#define VISOBJ_TYPE_FBA 4 | ||
78 : | //#define VISOBJ_TYPE_3DMESH 5 | ||
79 : | Isibaar | 1.1 | |
80 : | |||
81 : | #define VIDOBJLAY_TYPE_SIMPLE 1 | ||
82 : | edgomez | 1.6 | //#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE 2 |
83 : | Isibaar | 1.1 | #define VIDOBJLAY_TYPE_CORE 3 |
84 : | #define VIDOBJLAY_TYPE_MAIN 4 | ||
85 : | suxen_drol | 1.10.2.3 | //#define VIDOBJLAY_TYPE_NBIT 5 |
86 : | //#define VIDOBJLAY_TYPE_ANIM_TEXT 6 | ||
87 : | //#define VIDOBJLAY_TYPE_ANIM_MESH 7 | ||
88 : | //#define VIDOBJLAY_TYPE_SIMPLE_FACE 8 | ||
89 : | //#define VIDOBJLAY_TYPE_STILL_SCALABLE 9 | ||
90 : | #define VIDOBJLAY_TYPE_ART_SIMPLE 10 | ||
91 : | //#define VIDOBJLAY_TYPE_CORE_SCALABLE 11 | ||
92 : | #define VIDOBJLAY_TYPE_ACE 12 | ||
93 : | //#define VIDOBJLAY_TYPE_SIMPLE_FBA 13 | ||
94 : | Isibaar | 1.1 | |
95 : | |||
96 : | edgomez | 1.6 | //#define VIDOBJLAY_AR_SQUARE 1 |
97 : | //#define VIDOBJLAY_AR_625TYPE_43 2 | ||
98 : | //#define VIDOBJLAY_AR_525TYPE_43 3 | ||
99 : | //#define VIDOBJLAY_AR_625TYPE_169 8 | ||
100 : | //#define VIDOBJLAY_AR_525TYPE_169 9 | ||
101 : | Isibaar | 1.1 | #define VIDOBJLAY_AR_EXTPAR 15 |
102 : | |||
103 : | |||
104 : | #define VIDOBJLAY_SHAPE_RECTANGULAR 0 | ||
105 : | #define VIDOBJLAY_SHAPE_BINARY 1 | ||
106 : | #define VIDOBJLAY_SHAPE_BINARY_ONLY 2 | ||
107 : | #define VIDOBJLAY_SHAPE_GRAYSCALE 3 | ||
108 : | |||
109 : | suxen_drol | 1.10.2.3 | |
110 : | #define SPRITE_NONE 0 | ||
111 : | #define SPRITE_STATIC 1 | ||
112 : | #define SPRITE_GMC 2 | ||
113 : | |||
114 : | |||
115 : | Isibaar | 1.1 | #define VO_START_CODE 0x8 |
116 : | #define VOL_START_CODE 0x12 | ||
117 : | #define VOP_START_CODE 0x1b6 | ||
118 : | |||
119 : | #define READ_MARKER() BitstreamSkip(bs, 1) | ||
120 : | #define WRITE_MARKER() BitstreamPutBit(bs, 1) | ||
121 : | |||
122 : | // vop coding types | ||
123 : | // intra, prediction, backward, sprite, not_coded | ||
124 : | #define I_VOP 0 | ||
125 : | #define P_VOP 1 | ||
126 : | #define B_VOP 2 | ||
127 : | #define S_VOP 3 | ||
128 : | #define N_VOP 4 | ||
129 : | |||
130 : | suxen_drol | 1.9 | // resync-specific |
131 : | #define NUMBITS_VP_RESYNC_MARKER 17 | ||
132 : | #define RESYNC_MARKER 1 | ||
133 : | |||
134 : | |||
135 : | suxen_drol | 1.10.2.3 | int read_video_packet_header(Bitstream *bs, |
136 : | DECODER * dec, | ||
137 : | const int addbits, | ||
138 : | int * quant, | ||
139 : | int * fcode_forward, | ||
140 : | int * fcode_backward, | ||
141 : | int * intra_dc_threshold); | ||
142 : | suxen_drol | 1.9 | |
143 : | Isibaar | 1.1 | |
144 : | // header stuff | ||
145 : | edgomez | 1.6 | int BitstreamReadHeaders(Bitstream * bs, |
146 : | DECODER * dec, | ||
147 : | uint32_t * rounding, | ||
148 : | suxen_drol | 1.10.2.3 | uint32_t * reduced_resolution, |
149 : | edgomez | 1.6 | uint32_t * quant, |
150 : | uint32_t * fcode_forward, | ||
151 : | uint32_t * fcode_backward, | ||
152 : | suxen_drol | 1.10.2.3 | uint32_t * intra_dc_threshold, |
153 : | VECTOR * gmc_mv); | ||
154 : | Isibaar | 1.1 | |
155 : | |||
156 : | void BitstreamWriteVolHeader(Bitstream * const bs, | ||
157 : | edgomez | 1.6 | const MBParam * pParam, |
158 : | chl | 1.10.2.2 | const FRAMEINFO * const frame); |
159 : | Isibaar | 1.1 | |
160 : | void BitstreamWriteVopHeader(Bitstream * const bs, | ||
161 : | edgomez | 1.6 | const MBParam * pParam, |
162 : | chl | 1.10.2.2 | const FRAMEINFO * const frame, |
163 : | suxen_drol | 1.8 | int vop_coded); |
164 : | |||
165 : | void BitstreamWriteUserData(Bitstream * const bs, | ||
166 : | uint8_t * data, | ||
167 : | const int length); | ||
168 : | Isibaar | 1.1 | |
169 : | /* initialise bitstream structure */ | ||
170 : | |||
171 : | edgomez | 1.6 | static void __inline |
172 : | BitstreamInit(Bitstream * const bs, | ||
173 : | void *const bitstream, | ||
174 : | uint32_t length) | ||
175 : | Isibaar | 1.1 | { |
176 : | uint32_t tmp; | ||
177 : | |||
178 : | edgomez | 1.6 | bs->start = bs->tail = (uint32_t *) bitstream; |
179 : | Isibaar | 1.1 | |
180 : | edgomez | 1.6 | tmp = *(uint32_t *) bitstream; |
181 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
182 : | BSWAP(tmp); | ||
183 : | #endif | ||
184 : | bs->bufa = tmp; | ||
185 : | |||
186 : | edgomez | 1.6 | tmp = *((uint32_t *) bitstream + 1); |
187 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
188 : | BSWAP(tmp); | ||
189 : | #endif | ||
190 : | bs->bufb = tmp; | ||
191 : | |||
192 : | bs->buf = 0; | ||
193 : | bs->pos = 0; | ||
194 : | bs->length = length; | ||
195 : | } | ||
196 : | |||
197 : | |||
198 : | /* reset bitstream state */ | ||
199 : | |||
200 : | edgomez | 1.6 | static void __inline |
201 : | BitstreamReset(Bitstream * const bs) | ||
202 : | Isibaar | 1.1 | { |
203 : | uint32_t tmp; | ||
204 : | |||
205 : | bs->tail = bs->start; | ||
206 : | |||
207 : | tmp = *bs->start; | ||
208 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
209 : | BSWAP(tmp); | ||
210 : | #endif | ||
211 : | bs->bufa = tmp; | ||
212 : | |||
213 : | tmp = *(bs->start + 1); | ||
214 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
215 : | BSWAP(tmp); | ||
216 : | #endif | ||
217 : | bs->bufb = tmp; | ||
218 : | |||
219 : | bs->buf = 0; | ||
220 : | edgomez | 1.6 | bs->pos = 0; |
221 : | Isibaar | 1.1 | } |
222 : | |||
223 : | |||
224 : | /* reads n bits from bitstream without changing the stream pos */ | ||
225 : | |||
226 : | edgomez | 1.6 | static uint32_t __inline |
227 : | BitstreamShowBits(Bitstream * const bs, | ||
228 : | const uint32_t bits) | ||
229 : | Isibaar | 1.1 | { |
230 : | int nbit = (bits + bs->pos) - 32; | ||
231 : | edgomez | 1.6 | |
232 : | if (nbit > 0) { | ||
233 : | return ((bs->bufa & (0xffffffff >> bs->pos)) << nbit) | (bs-> | ||
234 : | bufb >> (32 - | ||
235 : | nbit)); | ||
236 : | } else { | ||
237 : | Isibaar | 1.1 | return (bs->bufa & (0xffffffff >> bs->pos)) >> (32 - bs->pos - bits); |
238 : | } | ||
239 : | } | ||
240 : | |||
241 : | |||
242 : | /* skip n bits forward in bitstream */ | ||
243 : | |||
244 : | edgomez | 1.6 | static __inline void |
245 : | BitstreamSkip(Bitstream * const bs, | ||
246 : | const uint32_t bits) | ||
247 : | Isibaar | 1.1 | { |
248 : | bs->pos += bits; | ||
249 : | |||
250 : | edgomez | 1.6 | if (bs->pos >= 32) { |
251 : | Isibaar | 1.1 | uint32_t tmp; |
252 : | |||
253 : | bs->bufa = bs->bufb; | ||
254 : | edgomez | 1.6 | tmp = *((uint32_t *) bs->tail + 2); |
255 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
256 : | BSWAP(tmp); | ||
257 : | #endif | ||
258 : | bs->bufb = tmp; | ||
259 : | bs->tail++; | ||
260 : | bs->pos -= 32; | ||
261 : | } | ||
262 : | } | ||
263 : | suxen_drol | 1.9 | |
264 : | |||
265 : | // number of bits to next byte alignment | ||
266 : | static __inline uint32_t | ||
267 : | BitstreamNumBitsToByteAlign(Bitstream *bs) | ||
268 : | { | ||
269 : | uint32_t n = (32 - bs->pos) % 8; | ||
270 : | return n == 0 ? 8 : n; | ||
271 : | } | ||
272 : | |||
273 : | |||
274 : | // show nbits from next byte alignment | ||
275 : | static __inline uint32_t | ||
276 : | BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits) | ||
277 : | { | ||
278 : | int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs); | ||
279 : | int nbit = (bits + bspos) - 32; | ||
280 : | |||
281 : | if (bspos >= 32) { | ||
282 : | return bs->bufb >> (32 - nbit); | ||
283 : | } else if (nbit > 0) { | ||
284 : | return ((bs->bufa & (0xffffffff >> bspos)) << nbit) | (bs-> | ||
285 : | bufb >> (32 - | ||
286 : | nbit)); | ||
287 : | } else { | ||
288 : | return (bs->bufa & (0xffffffff >> bspos)) >> (32 - bspos - bits); | ||
289 : | } | ||
290 : | |||
291 : | } | ||
292 : | |||
293 : | Isibaar | 1.1 | |
294 : | |||
295 : | /* move forward to the next byte boundary */ | ||
296 : | |||
297 : | edgomez | 1.6 | static __inline void |
298 : | BitstreamByteAlign(Bitstream * const bs) | ||
299 : | Isibaar | 1.1 | { |
300 : | uint32_t remainder = bs->pos % 8; | ||
301 : | edgomez | 1.6 | |
302 : | if (remainder) { | ||
303 : | Isibaar | 1.1 | BitstreamSkip(bs, 8 - remainder); |
304 : | } | ||
305 : | } | ||
306 : | |||
307 : | |||
308 : | /* bitstream length (unit bits) */ | ||
309 : | |||
310 : | edgomez | 1.6 | static uint32_t __inline |
311 : | BitstreamPos(const Bitstream * const bs) | ||
312 : | Isibaar | 1.1 | { |
313 : | Isibaar | 1.7 | return 8 * ((ptr_t)bs->tail - (ptr_t)bs->start) + bs->pos; |
314 : | Isibaar | 1.1 | } |
315 : | |||
316 : | |||
317 : | /* flush the bitstream & return length (unit bytes) | ||
318 : | NOTE: assumes no futher bitstream functions will be called. | ||
319 : | */ | ||
320 : | |||
321 : | edgomez | 1.6 | static uint32_t __inline |
322 : | BitstreamLength(Bitstream * const bs) | ||
323 : | Isibaar | 1.1 | { |
324 : | Isibaar | 1.7 | uint32_t len = (ptr_t) bs->tail - (ptr_t) bs->start; |
325 : | Isibaar | 1.1 | |
326 : | edgomez | 1.6 | if (bs->pos) { |
327 : | Isibaar | 1.1 | uint32_t b = bs->buf; |
328 : | edgomez | 1.6 | |
329 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
330 : | BSWAP(b); | ||
331 : | #endif | ||
332 : | *bs->tail = b; | ||
333 : | |||
334 : | len += (bs->pos + 7) / 8; | ||
335 : | edgomez | 1.6 | } |
336 : | Isibaar | 1.1 | |
337 : | return len; | ||
338 : | } | ||
339 : | |||
340 : | |||
341 : | /* move bitstream position forward by n bits and write out buffer if needed */ | ||
342 : | |||
343 : | edgomez | 1.6 | static void __inline |
344 : | BitstreamForward(Bitstream * const bs, | ||
345 : | const uint32_t bits) | ||
346 : | Isibaar | 1.1 | { |
347 : | edgomez | 1.6 | bs->pos += bits; |
348 : | Isibaar | 1.1 | |
349 : | edgomez | 1.6 | if (bs->pos >= 32) { |
350 : | Isibaar | 1.1 | uint32_t b = bs->buf; |
351 : | edgomez | 1.6 | |
352 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
353 : | BSWAP(b); | ||
354 : | #endif | ||
355 : | *bs->tail++ = b; | ||
356 : | bs->buf = 0; | ||
357 : | bs->pos -= 32; | ||
358 : | edgomez | 1.6 | } |
359 : | Isibaar | 1.1 | } |
360 : | |||
361 : | |||
362 : | /* read n bits from bitstream */ | ||
363 : | |||
364 : | edgomez | 1.6 | static uint32_t __inline |
365 : | BitstreamGetBits(Bitstream * const bs, | ||
366 : | const uint32_t n) | ||
367 : | Isibaar | 1.1 | { |
368 : | uint32_t ret = BitstreamShowBits(bs, n); | ||
369 : | edgomez | 1.6 | |
370 : | Isibaar | 1.1 | BitstreamSkip(bs, n); |
371 : | return ret; | ||
372 : | } | ||
373 : | |||
374 : | |||
375 : | /* read single bit from bitstream */ | ||
376 : | |||
377 : | edgomez | 1.6 | static uint32_t __inline |
378 : | BitstreamGetBit(Bitstream * const bs) | ||
379 : | Isibaar | 1.1 | { |
380 : | return BitstreamGetBits(bs, 1); | ||
381 : | } | ||
382 : | |||
383 : | |||
384 : | /* write single bit to bitstream */ | ||
385 : | |||
386 : | edgomez | 1.6 | static void __inline |
387 : | BitstreamPutBit(Bitstream * const bs, | ||
388 : | const uint32_t bit) | ||
389 : | Isibaar | 1.1 | { |
390 : | edgomez | 1.6 | if (bit) |
391 : | Isibaar | 1.1 | bs->buf |= (0x80000000 >> bs->pos); |
392 : | |||
393 : | edgomez | 1.6 | BitstreamForward(bs, 1); |
394 : | Isibaar | 1.1 | } |
395 : | |||
396 : | |||
397 : | /* write n bits to bitstream */ | ||
398 : | |||
399 : | edgomez | 1.6 | static void __inline |
400 : | BitstreamPutBits(Bitstream * const bs, | ||
401 : | const uint32_t value, | ||
402 : | const uint32_t size) | ||
403 : | Isibaar | 1.1 | { |
404 : | uint32_t shift = 32 - bs->pos - size; | ||
405 : | |||
406 : | if (shift <= 32) { | ||
407 : | bs->buf |= value << shift; | ||
408 : | BitstreamForward(bs, size); | ||
409 : | } else { | ||
410 : | uint32_t remainder; | ||
411 : | |||
412 : | shift = size - (32 - bs->pos); | ||
413 : | bs->buf |= value >> shift; | ||
414 : | BitstreamForward(bs, size - shift); | ||
415 : | remainder = shift; | ||
416 : | |||
417 : | shift = 32 - shift; | ||
418 : | edgomez | 1.6 | |
419 : | Isibaar | 1.1 | bs->buf |= value << shift; |
420 : | BitstreamForward(bs, remainder); | ||
421 : | } | ||
422 : | } | ||
423 : | suxen_drol | 1.10.2.1 | |
424 : | |||
425 : | static const int stuffing_codes[8] = | ||
426 : | { | ||
427 : | /* nbits stuffing code */ | ||
428 : | 0, /* 1 0 */ | ||
429 : | 1, /* 2 01 */ | ||
430 : | 3, /* 3 011 */ | ||
431 : | 7, /* 4 0111 */ | ||
432 : | 0xf, /* 5 01111 */ | ||
433 : | 0x1f, /* 6 011111 */ | ||
434 : | 0x3f, /* 7 0111111 */ | ||
435 : | 0x7f, /* 8 01111111 */ | ||
436 : | }; | ||
437 : | |||
438 : | /* pad bitstream to the next byte boundary */ | ||
439 : | |||
440 : | static void __inline | ||
441 : | BitstreamPad(Bitstream * const bs) | ||
442 : | { | ||
443 : | int bits = 8 - (bs->pos % 8); | ||
444 : | if (bits < 8) | ||
445 : | { | ||
446 : | BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); | ||
447 : | } | ||
448 : | } | ||
449 : | |||
450 : | |||
451 : | /* pad bitstream to the next byte boundary | ||
452 : | alway pad: even if currently at the byte boundary */ | ||
453 : | |||
454 : | static void __inline | ||
455 : | BitstreamPadAlways(Bitstream * const bs) | ||
456 : | { | ||
457 : | int bits = 8 - (bs->pos % 8); | ||
458 : | BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); | ||
459 : | } | ||
460 : | |||
461 : | Isibaar | 1.1 | |
462 : | edgomez | 1.6 | #endif /* _BITSTREAM_H_ */ |
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