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Revision 1.17.2.3 - (view) (download)
1 : | edgomez | 1.17.2.3 | /***************************************************************************** |
2 : | * | ||
3 : | * XVID MPEG-4 VIDEO CODEC | ||
4 : | * - Bitstream reader/writer inlined functions and constants- | ||
5 : | * | ||
6 : | * Copyright (C) 2001-2003 - Peter Ross <pross@xvid.org> | ||
7 : | * | ||
8 : | * This file is part of XviD, a free MPEG-4 video encoder/decoder | ||
9 : | * | ||
10 : | * XviD is free software; you can redistribute it and/or modify it | ||
11 : | * under the terms of the GNU General Public License as published by | ||
12 : | * the Free Software Foundation; either version 2 of the License, or | ||
13 : | * (at your option) any later version. | ||
14 : | * | ||
15 : | * This program is distributed in the hope that it will be useful, | ||
16 : | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
17 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
18 : | * GNU General Public License for more details. | ||
19 : | * | ||
20 : | * You should have received a copy of the GNU General Public License | ||
21 : | * along with this program; if not, write to the Free Software | ||
22 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
23 : | * | ||
24 : | * $Id: bitstream.h,v 1.16 2003/02/09 19:32:52 edgomez Exp $ | ||
25 : | * | ||
26 : | ****************************************************************************/ | ||
27 : | Isibaar | 1.1 | |
28 : | #ifndef _BITSTREAM_H_ | ||
29 : | #define _BITSTREAM_H_ | ||
30 : | |||
31 : | #include "../portab.h" | ||
32 : | #include "../decoder.h" | ||
33 : | #include "../encoder.h" | ||
34 : | |||
35 : | edgomez | 1.11 | |
36 : | edgomez | 1.17.2.3 | /***************************************************************************** |
37 : | * Constants | ||
38 : | ****************************************************************************/ | ||
39 : | |||
40 : | /* comment any #defs we dont use */ | ||
41 : | Isibaar | 1.1 | |
42 : | #define VIDOBJ_START_CODE 0x00000100 /* ..0x0000011f */ | ||
43 : | #define VIDOBJLAY_START_CODE 0x00000120 /* ..0x0000012f */ | ||
44 : | #define VISOBJSEQ_START_CODE 0x000001b0 | ||
45 : | #define VISOBJSEQ_STOP_CODE 0x000001b1 /* ??? */ | ||
46 : | #define USERDATA_START_CODE 0x000001b2 | ||
47 : | #define GRPOFVOP_START_CODE 0x000001b3 | ||
48 : | edgomez | 1.17.2.3 | /*#define VIDSESERR_ERROR_CODE 0x000001b4 */ |
49 : | Isibaar | 1.1 | #define VISOBJ_START_CODE 0x000001b5 |
50 : | edgomez | 1.17 | #define VOP_START_CODE 0x000001b6 |
51 : | edgomez | 1.17.2.3 | /*#define STUFFING_START_CODE 0x000001c3 */ |
52 : | Isibaar | 1.1 | |
53 : | |||
54 : | #define VISOBJ_TYPE_VIDEO 1 | ||
55 : | edgomez | 1.17.2.3 | /*#define VISOBJ_TYPE_STILLTEXTURE 2 */ |
56 : | /*#define VISOBJ_TYPE_MESH 3 */ | ||
57 : | /*#define VISOBJ_TYPE_FBA 4 */ | ||
58 : | /*#define VISOBJ_TYPE_3DMESH 5 */ | ||
59 : | Isibaar | 1.1 | |
60 : | |||
61 : | #define VIDOBJLAY_TYPE_SIMPLE 1 | ||
62 : | edgomez | 1.17.2.3 | /*#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE 2 */ |
63 : | Isibaar | 1.1 | #define VIDOBJLAY_TYPE_CORE 3 |
64 : | #define VIDOBJLAY_TYPE_MAIN 4 | ||
65 : | edgomez | 1.17.2.3 | /*#define VIDOBJLAY_TYPE_NBIT 5 */ |
66 : | /*#define VIDOBJLAY_TYPE_ANIM_TEXT 6 */ | ||
67 : | /*#define VIDOBJLAY_TYPE_ANIM_MESH 7 */ | ||
68 : | /*#define VIDOBJLAY_TYPE_SIMPLE_FACE 8 */ | ||
69 : | /*#define VIDOBJLAY_TYPE_STILL_SCALABLE 9 */ | ||
70 : | edgomez | 1.17 | #define VIDOBJLAY_TYPE_ART_SIMPLE 10 |
71 : | edgomez | 1.17.2.3 | /*#define VIDOBJLAY_TYPE_CORE_SCALABLE 11 */ |
72 : | edgomez | 1.17 | #define VIDOBJLAY_TYPE_ACE 12 |
73 : | edgomez | 1.17.2.3 | /*#define VIDOBJLAY_TYPE_SIMPLE_FBA 13 */ |
74 : | suxen_drol | 1.17.2.2 | #define VIDOBJLAY_TYPE_ASP 17 |
75 : | edgomez | 1.17 | |
76 : | |||
77 : | edgomez | 1.17.2.3 | /*#define VIDOBJLAY_AR_SQUARE 1 */ |
78 : | /*#define VIDOBJLAY_AR_625TYPE_43 2 */ | ||
79 : | /*#define VIDOBJLAY_AR_525TYPE_43 3 */ | ||
80 : | /*#define VIDOBJLAY_AR_625TYPE_169 8 */ | ||
81 : | /*#define VIDOBJLAY_AR_525TYPE_169 9 */ | ||
82 : | Isibaar | 1.1 | #define VIDOBJLAY_AR_EXTPAR 15 |
83 : | |||
84 : | |||
85 : | #define VIDOBJLAY_SHAPE_RECTANGULAR 0 | ||
86 : | #define VIDOBJLAY_SHAPE_BINARY 1 | ||
87 : | #define VIDOBJLAY_SHAPE_BINARY_ONLY 2 | ||
88 : | #define VIDOBJLAY_SHAPE_GRAYSCALE 3 | ||
89 : | |||
90 : | edgomez | 1.17 | |
91 : | #define SPRITE_NONE 0 | ||
92 : | #define SPRITE_STATIC 1 | ||
93 : | #define SPRITE_GMC 2 | ||
94 : | |||
95 : | |||
96 : | Isibaar | 1.1 | |
97 : | #define READ_MARKER() BitstreamSkip(bs, 1) | ||
98 : | #define WRITE_MARKER() BitstreamPutBit(bs, 1) | ||
99 : | |||
100 : | edgomez | 1.17.2.3 | /* vop coding types */ |
101 : | /* intra, prediction, backward, sprite, not_coded */ | ||
102 : | Isibaar | 1.1 | #define I_VOP 0 |
103 : | #define P_VOP 1 | ||
104 : | #define B_VOP 2 | ||
105 : | #define S_VOP 3 | ||
106 : | #define N_VOP 4 | ||
107 : | |||
108 : | edgomez | 1.17.2.3 | /* resync-specific */ |
109 : | suxen_drol | 1.9 | #define NUMBITS_VP_RESYNC_MARKER 17 |
110 : | #define RESYNC_MARKER 1 | ||
111 : | |||
112 : | |||
113 : | edgomez | 1.17.2.3 | /***************************************************************************** |
114 : | * Prototypes | ||
115 : | ****************************************************************************/ | ||
116 : | edgomez | 1.11 | |
117 : | edgomez | 1.17.2.3 | int read_video_packet_header(Bitstream *bs, |
118 : | DECODER * dec, | ||
119 : | const int addbits, | ||
120 : | int *quant, | ||
121 : | int *fcode_forward, | ||
122 : | int *fcode_backward, | ||
123 : | int *intra_dc_threshold); | ||
124 : | suxen_drol | 1.9 | |
125 : | edgomez | 1.17.2.3 | /* header stuff */ |
126 : | edgomez | 1.6 | int BitstreamReadHeaders(Bitstream * bs, |
127 : | DECODER * dec, | ||
128 : | uint32_t * rounding, | ||
129 : | edgomez | 1.17 | uint32_t * reduced_resolution, |
130 : | edgomez | 1.6 | uint32_t * quant, |
131 : | uint32_t * fcode_forward, | ||
132 : | uint32_t * fcode_backward, | ||
133 : | edgomez | 1.17 | uint32_t * intra_dc_threshold, |
134 : | WARPPOINTS * gmc_warp); | ||
135 : | Isibaar | 1.1 | |
136 : | |||
137 : | void BitstreamWriteVolHeader(Bitstream * const bs, | ||
138 : | suxen_drol | 1.17.2.1 | const MBParam * pParam); |
139 : | Isibaar | 1.1 | |
140 : | void BitstreamWriteVopHeader(Bitstream * const bs, | ||
141 : | edgomez | 1.6 | const MBParam * pParam, |
142 : | edgomez | 1.17 | const FRAMEINFO * const frame, |
143 : | suxen_drol | 1.8 | int vop_coded); |
144 : | Isibaar | 1.1 | |
145 : | edgomez | 1.17 | void BitstreamWriteUserData(Bitstream * const bs, |
146 : | uint8_t * data, | ||
147 : | const int length); | ||
148 : | edgomez | 1.11 | |
149 : | Isibaar | 1.1 | /* initialise bitstream structure */ |
150 : | |||
151 : | edgomez | 1.6 | static void __inline |
152 : | BitstreamInit(Bitstream * const bs, | ||
153 : | void *const bitstream, | ||
154 : | uint32_t length) | ||
155 : | Isibaar | 1.1 | { |
156 : | uint32_t tmp; | ||
157 : | edgomez | 1.17.2.3 | size_t bitpos; |
158 : | ptr_t adjbitstream = (ptr_t)bitstream; | ||
159 : | Isibaar | 1.1 | |
160 : | edgomez | 1.17.2.3 | /* |
161 : | * Start the stream on a uint32_t boundary, by rounding down to the | ||
162 : | * previous uint32_t and skipping the intervening bytes. | ||
163 : | */ | ||
164 : | bitpos = ((sizeof(uint32_t)-1) & (size_t)bitstream); | ||
165 : | adjbitstream = adjbitstream - bitpos; | ||
166 : | bs->start = bs->tail = (uint32_t *) adjbitstream; | ||
167 : | Isibaar | 1.1 | |
168 : | edgomez | 1.17.2.3 | tmp = *bs->start; |
169 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
170 : | BSWAP(tmp); | ||
171 : | #endif | ||
172 : | bs->bufa = tmp; | ||
173 : | |||
174 : | edgomez | 1.17.2.3 | tmp = *(bs->start + 1); |
175 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
176 : | BSWAP(tmp); | ||
177 : | #endif | ||
178 : | bs->bufb = tmp; | ||
179 : | |||
180 : | bs->buf = 0; | ||
181 : | edgomez | 1.17.2.3 | bs->pos = bs->initpos = bitpos*8; |
182 : | Isibaar | 1.1 | bs->length = length; |
183 : | } | ||
184 : | |||
185 : | |||
186 : | /* reset bitstream state */ | ||
187 : | |||
188 : | edgomez | 1.6 | static void __inline |
189 : | BitstreamReset(Bitstream * const bs) | ||
190 : | Isibaar | 1.1 | { |
191 : | uint32_t tmp; | ||
192 : | |||
193 : | bs->tail = bs->start; | ||
194 : | |||
195 : | tmp = *bs->start; | ||
196 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
197 : | BSWAP(tmp); | ||
198 : | #endif | ||
199 : | bs->bufa = tmp; | ||
200 : | |||
201 : | tmp = *(bs->start + 1); | ||
202 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
203 : | BSWAP(tmp); | ||
204 : | #endif | ||
205 : | bs->bufb = tmp; | ||
206 : | |||
207 : | bs->buf = 0; | ||
208 : | edgomez | 1.17.2.3 | bs->pos = bs->initpos; |
209 : | Isibaar | 1.1 | } |
210 : | |||
211 : | |||
212 : | /* reads n bits from bitstream without changing the stream pos */ | ||
213 : | |||
214 : | edgomez | 1.6 | static uint32_t __inline |
215 : | BitstreamShowBits(Bitstream * const bs, | ||
216 : | const uint32_t bits) | ||
217 : | Isibaar | 1.1 | { |
218 : | int nbit = (bits + bs->pos) - 32; | ||
219 : | edgomez | 1.6 | |
220 : | if (nbit > 0) { | ||
221 : | return ((bs->bufa & (0xffffffff >> bs->pos)) << nbit) | (bs-> | ||
222 : | bufb >> (32 - | ||
223 : | nbit)); | ||
224 : | } else { | ||
225 : | Isibaar | 1.1 | return (bs->bufa & (0xffffffff >> bs->pos)) >> (32 - bs->pos - bits); |
226 : | } | ||
227 : | } | ||
228 : | |||
229 : | |||
230 : | /* skip n bits forward in bitstream */ | ||
231 : | |||
232 : | edgomez | 1.17 | static __inline void |
233 : | edgomez | 1.6 | BitstreamSkip(Bitstream * const bs, |
234 : | const uint32_t bits) | ||
235 : | Isibaar | 1.1 | { |
236 : | bs->pos += bits; | ||
237 : | |||
238 : | edgomez | 1.6 | if (bs->pos >= 32) { |
239 : | Isibaar | 1.1 | uint32_t tmp; |
240 : | |||
241 : | bs->bufa = bs->bufb; | ||
242 : | edgomez | 1.6 | tmp = *((uint32_t *) bs->tail + 2); |
243 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
244 : | BSWAP(tmp); | ||
245 : | #endif | ||
246 : | bs->bufb = tmp; | ||
247 : | bs->tail++; | ||
248 : | bs->pos -= 32; | ||
249 : | } | ||
250 : | } | ||
251 : | suxen_drol | 1.9 | |
252 : | |||
253 : | edgomez | 1.17.2.3 | /* number of bits to next byte alignment */ |
254 : | edgomez | 1.17 | static __inline uint32_t |
255 : | suxen_drol | 1.9 | BitstreamNumBitsToByteAlign(Bitstream *bs) |
256 : | { | ||
257 : | uint32_t n = (32 - bs->pos) % 8; | ||
258 : | return n == 0 ? 8 : n; | ||
259 : | } | ||
260 : | |||
261 : | |||
262 : | edgomez | 1.17.2.3 | /* show nbits from next byte alignment */ |
263 : | edgomez | 1.17 | static __inline uint32_t |
264 : | suxen_drol | 1.9 | BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits) |
265 : | { | ||
266 : | int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs); | ||
267 : | int nbit = (bits + bspos) - 32; | ||
268 : | |||
269 : | if (bspos >= 32) { | ||
270 : | return bs->bufb >> (32 - nbit); | ||
271 : | } else if (nbit > 0) { | ||
272 : | return ((bs->bufa & (0xffffffff >> bspos)) << nbit) | (bs-> | ||
273 : | bufb >> (32 - | ||
274 : | nbit)); | ||
275 : | } else { | ||
276 : | return (bs->bufa & (0xffffffff >> bspos)) >> (32 - bspos - bits); | ||
277 : | } | ||
278 : | |||
279 : | } | ||
280 : | |||
281 : | Isibaar | 1.1 | |
282 : | |||
283 : | /* move forward to the next byte boundary */ | ||
284 : | |||
285 : | edgomez | 1.17 | static __inline void |
286 : | edgomez | 1.6 | BitstreamByteAlign(Bitstream * const bs) |
287 : | Isibaar | 1.1 | { |
288 : | uint32_t remainder = bs->pos % 8; | ||
289 : | edgomez | 1.6 | |
290 : | if (remainder) { | ||
291 : | Isibaar | 1.1 | BitstreamSkip(bs, 8 - remainder); |
292 : | } | ||
293 : | } | ||
294 : | |||
295 : | |||
296 : | /* bitstream length (unit bits) */ | ||
297 : | |||
298 : | edgomez | 1.6 | static uint32_t __inline |
299 : | BitstreamPos(const Bitstream * const bs) | ||
300 : | Isibaar | 1.1 | { |
301 : | edgomez | 1.17.2.3 | return((uint32_t)(8*((ptr_t)bs->tail - (ptr_t)bs->start) + bs->pos - bs->initpos)); |
302 : | Isibaar | 1.1 | } |
303 : | |||
304 : | |||
305 : | edgomez | 1.17.2.3 | /* |
306 : | * flush the bitstream & return length (unit bytes) | ||
307 : | * NOTE: assumes no futher bitstream functions will be called. | ||
308 : | Isibaar | 1.1 | */ |
309 : | |||
310 : | edgomez | 1.6 | static uint32_t __inline |
311 : | BitstreamLength(Bitstream * const bs) | ||
312 : | Isibaar | 1.1 | { |
313 : | edgomez | 1.17.2.3 | uint32_t len = (uint32_t)((ptr_t)bs->tail - (ptr_t)bs->start); |
314 : | Isibaar | 1.1 | |
315 : | edgomez | 1.6 | if (bs->pos) { |
316 : | Isibaar | 1.1 | uint32_t b = bs->buf; |
317 : | edgomez | 1.6 | |
318 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
319 : | BSWAP(b); | ||
320 : | #endif | ||
321 : | *bs->tail = b; | ||
322 : | |||
323 : | len += (bs->pos + 7) / 8; | ||
324 : | edgomez | 1.6 | } |
325 : | Isibaar | 1.1 | |
326 : | edgomez | 1.17.2.3 | /* initpos is always on a byte boundary */ |
327 : | if (bs->initpos) | ||
328 : | len -= bs->initpos/8; | ||
329 : | |||
330 : | Isibaar | 1.1 | return len; |
331 : | } | ||
332 : | |||
333 : | |||
334 : | /* move bitstream position forward by n bits and write out buffer if needed */ | ||
335 : | |||
336 : | edgomez | 1.6 | static void __inline |
337 : | BitstreamForward(Bitstream * const bs, | ||
338 : | const uint32_t bits) | ||
339 : | Isibaar | 1.1 | { |
340 : | edgomez | 1.6 | bs->pos += bits; |
341 : | Isibaar | 1.1 | |
342 : | edgomez | 1.6 | if (bs->pos >= 32) { |
343 : | Isibaar | 1.1 | uint32_t b = bs->buf; |
344 : | edgomez | 1.6 | |
345 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
346 : | BSWAP(b); | ||
347 : | #endif | ||
348 : | *bs->tail++ = b; | ||
349 : | bs->buf = 0; | ||
350 : | bs->pos -= 32; | ||
351 : | edgomez | 1.6 | } |
352 : | Isibaar | 1.1 | } |
353 : | |||
354 : | /* read n bits from bitstream */ | ||
355 : | |||
356 : | edgomez | 1.6 | static uint32_t __inline |
357 : | BitstreamGetBits(Bitstream * const bs, | ||
358 : | const uint32_t n) | ||
359 : | Isibaar | 1.1 | { |
360 : | uint32_t ret = BitstreamShowBits(bs, n); | ||
361 : | edgomez | 1.6 | |
362 : | Isibaar | 1.1 | BitstreamSkip(bs, n); |
363 : | return ret; | ||
364 : | } | ||
365 : | |||
366 : | |||
367 : | /* read single bit from bitstream */ | ||
368 : | |||
369 : | edgomez | 1.6 | static uint32_t __inline |
370 : | BitstreamGetBit(Bitstream * const bs) | ||
371 : | Isibaar | 1.1 | { |
372 : | return BitstreamGetBits(bs, 1); | ||
373 : | } | ||
374 : | |||
375 : | |||
376 : | /* write single bit to bitstream */ | ||
377 : | |||
378 : | edgomez | 1.6 | static void __inline |
379 : | BitstreamPutBit(Bitstream * const bs, | ||
380 : | const uint32_t bit) | ||
381 : | Isibaar | 1.1 | { |
382 : | edgomez | 1.6 | if (bit) |
383 : | Isibaar | 1.1 | bs->buf |= (0x80000000 >> bs->pos); |
384 : | |||
385 : | edgomez | 1.6 | BitstreamForward(bs, 1); |
386 : | Isibaar | 1.1 | } |
387 : | |||
388 : | |||
389 : | /* write n bits to bitstream */ | ||
390 : | |||
391 : | edgomez | 1.6 | static void __inline |
392 : | BitstreamPutBits(Bitstream * const bs, | ||
393 : | const uint32_t value, | ||
394 : | const uint32_t size) | ||
395 : | Isibaar | 1.1 | { |
396 : | uint32_t shift = 32 - bs->pos - size; | ||
397 : | |||
398 : | if (shift <= 32) { | ||
399 : | bs->buf |= value << shift; | ||
400 : | BitstreamForward(bs, size); | ||
401 : | } else { | ||
402 : | uint32_t remainder; | ||
403 : | |||
404 : | shift = size - (32 - bs->pos); | ||
405 : | bs->buf |= value >> shift; | ||
406 : | BitstreamForward(bs, size - shift); | ||
407 : | remainder = shift; | ||
408 : | |||
409 : | shift = 32 - shift; | ||
410 : | edgomez | 1.6 | |
411 : | Isibaar | 1.1 | bs->buf |= value << shift; |
412 : | BitstreamForward(bs, remainder); | ||
413 : | } | ||
414 : | } | ||
415 : | |||
416 : | edgomez | 1.17 | static const int stuffing_codes[8] = |
417 : | { | ||
418 : | /* nbits stuffing code */ | ||
419 : | 0, /* 1 0 */ | ||
420 : | 1, /* 2 01 */ | ||
421 : | 3, /* 3 011 */ | ||
422 : | 7, /* 4 0111 */ | ||
423 : | 0xf, /* 5 01111 */ | ||
424 : | 0x1f, /* 6 011111 */ | ||
425 : | 0x3f, /* 7 0111111 */ | ||
426 : | 0x7f, /* 8 01111111 */ | ||
427 : | }; | ||
428 : | |||
429 : | /* pad bitstream to the next byte boundary */ | ||
430 : | |||
431 : | static void __inline | ||
432 : | BitstreamPad(Bitstream * const bs) | ||
433 : | { | ||
434 : | int bits = 8 - (bs->pos % 8); | ||
435 : | if (bits < 8) | ||
436 : | BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); | ||
437 : | } | ||
438 : | |||
439 : | |||
440 : | edgomez | 1.17.2.3 | /* |
441 : | * pad bitstream to the next byte boundary | ||
442 : | * alway pad: even if currently at the byte boundary | ||
443 : | */ | ||
444 : | edgomez | 1.17 | |
445 : | static void __inline | ||
446 : | BitstreamPadAlways(Bitstream * const bs) | ||
447 : | { | ||
448 : | int bits = 8 - (bs->pos % 8); | ||
449 : | BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); | ||
450 : | } | ||
451 : | |||
452 : | edgomez | 1.17.2.3 | #endif /* _BITSTREAM_H_ */ |
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