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Revision 1.17.2.9 - (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 : | edgomez | 1.17.2.5 | * Copyright (C) 2001-2003 Peter Ross <pross@xvid.org> |
7 : | edgomez | 1.17.2.3 | * |
8 : | edgomez | 1.17.2.5 | * This program is free software ; you can redistribute it and/or modify |
9 : | * it under the terms of the GNU General Public License as published by | ||
10 : | * the Free Software Foundation ; either version 2 of the License, or | ||
11 : | edgomez | 1.17.2.3 | * (at your option) any later version. |
12 : | * | ||
13 : | * This program is distributed in the hope that it will be useful, | ||
14 : | edgomez | 1.17.2.5 | * but WITHOUT ANY WARRANTY ; without even the implied warranty of |
15 : | edgomez | 1.17.2.3 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 : | * GNU General Public License for more details. | ||
17 : | * | ||
18 : | * You should have received a copy of the GNU General Public License | ||
19 : | edgomez | 1.17.2.5 | * along with this program ; if not, write to the Free Software |
20 : | edgomez | 1.17.2.3 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
21 : | * | ||
22 : | Isibaar | 1.17.2.9 | * $Id: bitstream.h,v 1.17.2.8 2003/11/19 15:46:55 syskin Exp $ |
23 : | edgomez | 1.17.2.3 | * |
24 : | ****************************************************************************/ | ||
25 : | Isibaar | 1.1 | |
26 : | #ifndef _BITSTREAM_H_ | ||
27 : | #define _BITSTREAM_H_ | ||
28 : | |||
29 : | #include "../portab.h" | ||
30 : | #include "../decoder.h" | ||
31 : | #include "../encoder.h" | ||
32 : | |||
33 : | edgomez | 1.11 | |
34 : | edgomez | 1.17.2.3 | /***************************************************************************** |
35 : | * Constants | ||
36 : | ****************************************************************************/ | ||
37 : | |||
38 : | /* comment any #defs we dont use */ | ||
39 : | Isibaar | 1.1 | |
40 : | #define VIDOBJ_START_CODE 0x00000100 /* ..0x0000011f */ | ||
41 : | #define VIDOBJLAY_START_CODE 0x00000120 /* ..0x0000012f */ | ||
42 : | #define VISOBJSEQ_START_CODE 0x000001b0 | ||
43 : | #define VISOBJSEQ_STOP_CODE 0x000001b1 /* ??? */ | ||
44 : | #define USERDATA_START_CODE 0x000001b2 | ||
45 : | #define GRPOFVOP_START_CODE 0x000001b3 | ||
46 : | edgomez | 1.17.2.3 | /*#define VIDSESERR_ERROR_CODE 0x000001b4 */ |
47 : | Isibaar | 1.1 | #define VISOBJ_START_CODE 0x000001b5 |
48 : | edgomez | 1.17 | #define VOP_START_CODE 0x000001b6 |
49 : | edgomez | 1.17.2.3 | /*#define STUFFING_START_CODE 0x000001c3 */ |
50 : | Isibaar | 1.1 | |
51 : | |||
52 : | #define VISOBJ_TYPE_VIDEO 1 | ||
53 : | edgomez | 1.17.2.3 | /*#define VISOBJ_TYPE_STILLTEXTURE 2 */ |
54 : | /*#define VISOBJ_TYPE_MESH 3 */ | ||
55 : | /*#define VISOBJ_TYPE_FBA 4 */ | ||
56 : | /*#define VISOBJ_TYPE_3DMESH 5 */ | ||
57 : | Isibaar | 1.1 | |
58 : | |||
59 : | #define VIDOBJLAY_TYPE_SIMPLE 1 | ||
60 : | edgomez | 1.17.2.3 | /*#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE 2 */ |
61 : | suxen_drol | 1.17.2.4 | /*#define VIDOBJLAY_TYPE_CORE 3 */ |
62 : | /*#define VIDOBJLAY_TYPE_MAIN 4 */ | ||
63 : | edgomez | 1.17.2.3 | /*#define VIDOBJLAY_TYPE_NBIT 5 */ |
64 : | /*#define VIDOBJLAY_TYPE_ANIM_TEXT 6 */ | ||
65 : | /*#define VIDOBJLAY_TYPE_ANIM_MESH 7 */ | ||
66 : | /*#define VIDOBJLAY_TYPE_SIMPLE_FACE 8 */ | ||
67 : | /*#define VIDOBJLAY_TYPE_STILL_SCALABLE 9 */ | ||
68 : | edgomez | 1.17 | #define VIDOBJLAY_TYPE_ART_SIMPLE 10 |
69 : | edgomez | 1.17.2.3 | /*#define VIDOBJLAY_TYPE_CORE_SCALABLE 11 */ |
70 : | suxen_drol | 1.17.2.4 | /*#define VIDOBJLAY_TYPE_ACE 12 */ |
71 : | /*#define VIDOBJLAY_TYPE_ADVANCED_SCALABLE_TEXTURE 13 */ | ||
72 : | /*#define VIDOBJLAY_TYPE_SIMPLE_FBA 14 */ | ||
73 : | /*#define VIDEOJLAY_TYPE_SIMPLE_STUDIO 15*/ | ||
74 : | /*#define VIDEOJLAY_TYPE_CORE_STUDIO 16*/ | ||
75 : | suxen_drol | 1.17.2.2 | #define VIDOBJLAY_TYPE_ASP 17 |
76 : | suxen_drol | 1.17.2.4 | /*#define VIDOBJLAY_TYPE_FGS 18*/ |
77 : | edgomez | 1.17 | |
78 : | |||
79 : | edgomez | 1.17.2.3 | /*#define VIDOBJLAY_AR_SQUARE 1 */ |
80 : | /*#define VIDOBJLAY_AR_625TYPE_43 2 */ | ||
81 : | /*#define VIDOBJLAY_AR_525TYPE_43 3 */ | ||
82 : | /*#define VIDOBJLAY_AR_625TYPE_169 8 */ | ||
83 : | /*#define VIDOBJLAY_AR_525TYPE_169 9 */ | ||
84 : | Isibaar | 1.1 | #define VIDOBJLAY_AR_EXTPAR 15 |
85 : | |||
86 : | |||
87 : | #define VIDOBJLAY_SHAPE_RECTANGULAR 0 | ||
88 : | #define VIDOBJLAY_SHAPE_BINARY 1 | ||
89 : | #define VIDOBJLAY_SHAPE_BINARY_ONLY 2 | ||
90 : | #define VIDOBJLAY_SHAPE_GRAYSCALE 3 | ||
91 : | |||
92 : | edgomez | 1.17 | |
93 : | #define SPRITE_NONE 0 | ||
94 : | #define SPRITE_STATIC 1 | ||
95 : | #define SPRITE_GMC 2 | ||
96 : | |||
97 : | |||
98 : | Isibaar | 1.1 | |
99 : | #define READ_MARKER() BitstreamSkip(bs, 1) | ||
100 : | #define WRITE_MARKER() BitstreamPutBit(bs, 1) | ||
101 : | |||
102 : | edgomez | 1.17.2.3 | /* vop coding types */ |
103 : | /* intra, prediction, backward, sprite, not_coded */ | ||
104 : | Isibaar | 1.1 | #define I_VOP 0 |
105 : | #define P_VOP 1 | ||
106 : | #define B_VOP 2 | ||
107 : | #define S_VOP 3 | ||
108 : | #define N_VOP 4 | ||
109 : | |||
110 : | edgomez | 1.17.2.3 | /* resync-specific */ |
111 : | suxen_drol | 1.9 | #define NUMBITS_VP_RESYNC_MARKER 17 |
112 : | #define RESYNC_MARKER 1 | ||
113 : | |||
114 : | |||
115 : | edgomez | 1.17.2.3 | /***************************************************************************** |
116 : | * Prototypes | ||
117 : | ****************************************************************************/ | ||
118 : | edgomez | 1.11 | |
119 : | edgomez | 1.17.2.6 | int read_video_packet_header(Bitstream *bs, |
120 : | DECODER * dec, | ||
121 : | const int addbits, | ||
122 : | int *quant, | ||
123 : | edgomez | 1.17.2.3 | int *fcode_forward, |
124 : | int *fcode_backward, | ||
125 : | int *intra_dc_threshold); | ||
126 : | suxen_drol | 1.9 | |
127 : | edgomez | 1.17.2.3 | /* header stuff */ |
128 : | edgomez | 1.6 | int BitstreamReadHeaders(Bitstream * bs, |
129 : | DECODER * dec, | ||
130 : | uint32_t * rounding, | ||
131 : | edgomez | 1.17 | uint32_t * reduced_resolution, |
132 : | edgomez | 1.6 | uint32_t * quant, |
133 : | uint32_t * fcode_forward, | ||
134 : | uint32_t * fcode_backward, | ||
135 : | edgomez | 1.17 | uint32_t * intra_dc_threshold, |
136 : | WARPPOINTS * gmc_warp); | ||
137 : | Isibaar | 1.1 | |
138 : | |||
139 : | void BitstreamWriteVolHeader(Bitstream * const bs, | ||
140 : | Isibaar | 1.17.2.9 | const MBParam * pParam, |
141 : | const FRAMEINFO * const frame); | ||
142 : | Isibaar | 1.1 | |
143 : | void BitstreamWriteVopHeader(Bitstream * const bs, | ||
144 : | edgomez | 1.6 | const MBParam * pParam, |
145 : | edgomez | 1.17 | const FRAMEINFO * const frame, |
146 : | syskin | 1.17.2.7 | int vop_coded, |
147 : | syskin | 1.17.2.8 | unsigned int quant); |
148 : | Isibaar | 1.1 | |
149 : | edgomez | 1.17.2.6 | void BitstreamWriteUserData(Bitstream * const bs, |
150 : | uint8_t * data, | ||
151 : | edgomez | 1.17 | const int length); |
152 : | edgomez | 1.11 | |
153 : | Isibaar | 1.1 | /* initialise bitstream structure */ |
154 : | |||
155 : | edgomez | 1.6 | static void __inline |
156 : | BitstreamInit(Bitstream * const bs, | ||
157 : | void *const bitstream, | ||
158 : | uint32_t length) | ||
159 : | Isibaar | 1.1 | { |
160 : | uint32_t tmp; | ||
161 : | edgomez | 1.17.2.3 | size_t bitpos; |
162 : | ptr_t adjbitstream = (ptr_t)bitstream; | ||
163 : | Isibaar | 1.1 | |
164 : | edgomez | 1.17.2.3 | /* |
165 : | * Start the stream on a uint32_t boundary, by rounding down to the | ||
166 : | * previous uint32_t and skipping the intervening bytes. | ||
167 : | */ | ||
168 : | bitpos = ((sizeof(uint32_t)-1) & (size_t)bitstream); | ||
169 : | adjbitstream = adjbitstream - bitpos; | ||
170 : | bs->start = bs->tail = (uint32_t *) adjbitstream; | ||
171 : | Isibaar | 1.1 | |
172 : | edgomez | 1.17.2.3 | tmp = *bs->start; |
173 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
174 : | BSWAP(tmp); | ||
175 : | #endif | ||
176 : | bs->bufa = tmp; | ||
177 : | |||
178 : | edgomez | 1.17.2.3 | tmp = *(bs->start + 1); |
179 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
180 : | BSWAP(tmp); | ||
181 : | #endif | ||
182 : | bs->bufb = tmp; | ||
183 : | |||
184 : | bs->buf = 0; | ||
185 : | edgomez | 1.17.2.3 | bs->pos = bs->initpos = bitpos*8; |
186 : | Isibaar | 1.1 | bs->length = length; |
187 : | } | ||
188 : | |||
189 : | |||
190 : | /* reset bitstream state */ | ||
191 : | |||
192 : | edgomez | 1.6 | static void __inline |
193 : | BitstreamReset(Bitstream * const bs) | ||
194 : | Isibaar | 1.1 | { |
195 : | uint32_t tmp; | ||
196 : | |||
197 : | bs->tail = bs->start; | ||
198 : | |||
199 : | tmp = *bs->start; | ||
200 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
201 : | BSWAP(tmp); | ||
202 : | #endif | ||
203 : | bs->bufa = tmp; | ||
204 : | |||
205 : | tmp = *(bs->start + 1); | ||
206 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
207 : | BSWAP(tmp); | ||
208 : | #endif | ||
209 : | bs->bufb = tmp; | ||
210 : | |||
211 : | bs->buf = 0; | ||
212 : | edgomez | 1.17.2.3 | bs->pos = bs->initpos; |
213 : | Isibaar | 1.1 | } |
214 : | |||
215 : | |||
216 : | /* reads n bits from bitstream without changing the stream pos */ | ||
217 : | |||
218 : | edgomez | 1.6 | static uint32_t __inline |
219 : | BitstreamShowBits(Bitstream * const bs, | ||
220 : | const uint32_t bits) | ||
221 : | Isibaar | 1.1 | { |
222 : | int nbit = (bits + bs->pos) - 32; | ||
223 : | edgomez | 1.6 | |
224 : | if (nbit > 0) { | ||
225 : | return ((bs->bufa & (0xffffffff >> bs->pos)) << nbit) | (bs-> | ||
226 : | bufb >> (32 - | ||
227 : | nbit)); | ||
228 : | } else { | ||
229 : | Isibaar | 1.1 | return (bs->bufa & (0xffffffff >> bs->pos)) >> (32 - bs->pos - bits); |
230 : | } | ||
231 : | } | ||
232 : | |||
233 : | |||
234 : | /* skip n bits forward in bitstream */ | ||
235 : | |||
236 : | edgomez | 1.17 | static __inline void |
237 : | edgomez | 1.6 | BitstreamSkip(Bitstream * const bs, |
238 : | const uint32_t bits) | ||
239 : | Isibaar | 1.1 | { |
240 : | bs->pos += bits; | ||
241 : | |||
242 : | edgomez | 1.6 | if (bs->pos >= 32) { |
243 : | Isibaar | 1.1 | uint32_t tmp; |
244 : | |||
245 : | bs->bufa = bs->bufb; | ||
246 : | edgomez | 1.6 | tmp = *((uint32_t *) bs->tail + 2); |
247 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
248 : | BSWAP(tmp); | ||
249 : | #endif | ||
250 : | bs->bufb = tmp; | ||
251 : | bs->tail++; | ||
252 : | bs->pos -= 32; | ||
253 : | } | ||
254 : | } | ||
255 : | suxen_drol | 1.9 | |
256 : | |||
257 : | edgomez | 1.17.2.3 | /* number of bits to next byte alignment */ |
258 : | edgomez | 1.17.2.6 | static __inline uint32_t |
259 : | suxen_drol | 1.9 | BitstreamNumBitsToByteAlign(Bitstream *bs) |
260 : | { | ||
261 : | uint32_t n = (32 - bs->pos) % 8; | ||
262 : | return n == 0 ? 8 : n; | ||
263 : | } | ||
264 : | |||
265 : | |||
266 : | edgomez | 1.17.2.3 | /* show nbits from next byte alignment */ |
267 : | edgomez | 1.17 | static __inline uint32_t |
268 : | suxen_drol | 1.9 | BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits) |
269 : | { | ||
270 : | int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs); | ||
271 : | int nbit = (bits + bspos) - 32; | ||
272 : | |||
273 : | if (bspos >= 32) { | ||
274 : | return bs->bufb >> (32 - nbit); | ||
275 : | } else if (nbit > 0) { | ||
276 : | return ((bs->bufa & (0xffffffff >> bspos)) << nbit) | (bs-> | ||
277 : | bufb >> (32 - | ||
278 : | nbit)); | ||
279 : | } else { | ||
280 : | return (bs->bufa & (0xffffffff >> bspos)) >> (32 - bspos - bits); | ||
281 : | } | ||
282 : | |||
283 : | } | ||
284 : | |||
285 : | Isibaar | 1.1 | |
286 : | |||
287 : | /* move forward to the next byte boundary */ | ||
288 : | |||
289 : | edgomez | 1.17 | static __inline void |
290 : | edgomez | 1.6 | BitstreamByteAlign(Bitstream * const bs) |
291 : | Isibaar | 1.1 | { |
292 : | uint32_t remainder = bs->pos % 8; | ||
293 : | edgomez | 1.6 | |
294 : | if (remainder) { | ||
295 : | Isibaar | 1.1 | BitstreamSkip(bs, 8 - remainder); |
296 : | } | ||
297 : | } | ||
298 : | |||
299 : | |||
300 : | /* bitstream length (unit bits) */ | ||
301 : | |||
302 : | edgomez | 1.6 | static uint32_t __inline |
303 : | BitstreamPos(const Bitstream * const bs) | ||
304 : | Isibaar | 1.1 | { |
305 : | edgomez | 1.17.2.3 | return((uint32_t)(8*((ptr_t)bs->tail - (ptr_t)bs->start) + bs->pos - bs->initpos)); |
306 : | Isibaar | 1.1 | } |
307 : | |||
308 : | |||
309 : | edgomez | 1.17.2.3 | /* |
310 : | * flush the bitstream & return length (unit bytes) | ||
311 : | * NOTE: assumes no futher bitstream functions will be called. | ||
312 : | Isibaar | 1.1 | */ |
313 : | |||
314 : | edgomez | 1.6 | static uint32_t __inline |
315 : | BitstreamLength(Bitstream * const bs) | ||
316 : | Isibaar | 1.1 | { |
317 : | edgomez | 1.17.2.3 | uint32_t len = (uint32_t)((ptr_t)bs->tail - (ptr_t)bs->start); |
318 : | Isibaar | 1.1 | |
319 : | edgomez | 1.6 | if (bs->pos) { |
320 : | Isibaar | 1.1 | uint32_t b = bs->buf; |
321 : | edgomez | 1.6 | |
322 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
323 : | BSWAP(b); | ||
324 : | #endif | ||
325 : | *bs->tail = b; | ||
326 : | |||
327 : | len += (bs->pos + 7) / 8; | ||
328 : | edgomez | 1.6 | } |
329 : | Isibaar | 1.1 | |
330 : | edgomez | 1.17.2.3 | /* initpos is always on a byte boundary */ |
331 : | if (bs->initpos) | ||
332 : | len -= bs->initpos/8; | ||
333 : | |||
334 : | Isibaar | 1.1 | return len; |
335 : | } | ||
336 : | |||
337 : | |||
338 : | /* move bitstream position forward by n bits and write out buffer if needed */ | ||
339 : | |||
340 : | edgomez | 1.6 | static void __inline |
341 : | BitstreamForward(Bitstream * const bs, | ||
342 : | const uint32_t bits) | ||
343 : | Isibaar | 1.1 | { |
344 : | edgomez | 1.6 | bs->pos += bits; |
345 : | Isibaar | 1.1 | |
346 : | edgomez | 1.6 | if (bs->pos >= 32) { |
347 : | Isibaar | 1.1 | uint32_t b = bs->buf; |
348 : | edgomez | 1.6 | |
349 : | Isibaar | 1.1 | #ifndef ARCH_IS_BIG_ENDIAN |
350 : | BSWAP(b); | ||
351 : | #endif | ||
352 : | *bs->tail++ = b; | ||
353 : | bs->buf = 0; | ||
354 : | bs->pos -= 32; | ||
355 : | edgomez | 1.6 | } |
356 : | Isibaar | 1.1 | } |
357 : | |||
358 : | /* read n bits from bitstream */ | ||
359 : | |||
360 : | edgomez | 1.6 | static uint32_t __inline |
361 : | BitstreamGetBits(Bitstream * const bs, | ||
362 : | const uint32_t n) | ||
363 : | Isibaar | 1.1 | { |
364 : | uint32_t ret = BitstreamShowBits(bs, n); | ||
365 : | edgomez | 1.6 | |
366 : | Isibaar | 1.1 | BitstreamSkip(bs, n); |
367 : | return ret; | ||
368 : | } | ||
369 : | |||
370 : | |||
371 : | /* read single bit from bitstream */ | ||
372 : | |||
373 : | edgomez | 1.6 | static uint32_t __inline |
374 : | BitstreamGetBit(Bitstream * const bs) | ||
375 : | Isibaar | 1.1 | { |
376 : | return BitstreamGetBits(bs, 1); | ||
377 : | } | ||
378 : | |||
379 : | |||
380 : | /* write single bit to bitstream */ | ||
381 : | |||
382 : | edgomez | 1.6 | static void __inline |
383 : | BitstreamPutBit(Bitstream * const bs, | ||
384 : | const uint32_t bit) | ||
385 : | Isibaar | 1.1 | { |
386 : | edgomez | 1.6 | if (bit) |
387 : | Isibaar | 1.1 | bs->buf |= (0x80000000 >> bs->pos); |
388 : | |||
389 : | edgomez | 1.6 | BitstreamForward(bs, 1); |
390 : | Isibaar | 1.1 | } |
391 : | |||
392 : | |||
393 : | /* write n bits to bitstream */ | ||
394 : | |||
395 : | edgomez | 1.6 | static void __inline |
396 : | BitstreamPutBits(Bitstream * const bs, | ||
397 : | const uint32_t value, | ||
398 : | const uint32_t size) | ||
399 : | Isibaar | 1.1 | { |
400 : | uint32_t shift = 32 - bs->pos - size; | ||
401 : | |||
402 : | if (shift <= 32) { | ||
403 : | bs->buf |= value << shift; | ||
404 : | BitstreamForward(bs, size); | ||
405 : | } else { | ||
406 : | uint32_t remainder; | ||
407 : | |||
408 : | shift = size - (32 - bs->pos); | ||
409 : | bs->buf |= value >> shift; | ||
410 : | BitstreamForward(bs, size - shift); | ||
411 : | remainder = shift; | ||
412 : | |||
413 : | shift = 32 - shift; | ||
414 : | edgomez | 1.6 | |
415 : | Isibaar | 1.1 | bs->buf |= value << shift; |
416 : | BitstreamForward(bs, remainder); | ||
417 : | } | ||
418 : | } | ||
419 : | |||
420 : | edgomez | 1.17 | static const int stuffing_codes[8] = |
421 : | { | ||
422 : | /* nbits stuffing code */ | ||
423 : | 0, /* 1 0 */ | ||
424 : | 1, /* 2 01 */ | ||
425 : | 3, /* 3 011 */ | ||
426 : | 7, /* 4 0111 */ | ||
427 : | 0xf, /* 5 01111 */ | ||
428 : | 0x1f, /* 6 011111 */ | ||
429 : | 0x3f, /* 7 0111111 */ | ||
430 : | 0x7f, /* 8 01111111 */ | ||
431 : | }; | ||
432 : | |||
433 : | /* pad bitstream to the next byte boundary */ | ||
434 : | |||
435 : | static void __inline | ||
436 : | BitstreamPad(Bitstream * const bs) | ||
437 : | { | ||
438 : | int bits = 8 - (bs->pos % 8); | ||
439 : | if (bits < 8) | ||
440 : | BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); | ||
441 : | } | ||
442 : | |||
443 : | |||
444 : | edgomez | 1.17.2.3 | /* |
445 : | edgomez | 1.17.2.6 | * pad bitstream to the next byte boundary |
446 : | edgomez | 1.17.2.3 | * alway pad: even if currently at the byte boundary |
447 : | */ | ||
448 : | edgomez | 1.17 | |
449 : | static void __inline | ||
450 : | BitstreamPadAlways(Bitstream * const bs) | ||
451 : | { | ||
452 : | int bits = 8 - (bs->pos % 8); | ||
453 : | BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); | ||
454 : | } | ||
455 : | |||
456 : | edgomez | 1.17.2.3 | #endif /* _BITSTREAM_H_ */ |
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