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1 : | Isibaar | 3 | /****************************************************************************** |
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 : | h | 69 | * 26.03.2002 interlacing support - modified putvol/vopheaders paramters |
45 : | Isibaar | 3 | * 04.03.2002 putbits speedup (Isibaar) * |
46 : | * 03.03.2002 merged BITREADER and BITWRITER (Isibaar) * | ||
47 : | * 16.12.2001 inital version * | ||
48 : | * * | ||
49 : | ******************************************************************************/ | ||
50 : | |||
51 : | #ifndef _BITSTREAM_H_ | ||
52 : | #define _BITSTREAM_H_ | ||
53 : | |||
54 : | #include "../portab.h" | ||
55 : | #include "../decoder.h" | ||
56 : | #include "../encoder.h" | ||
57 : | |||
58 : | // comment any #defs we dont use | ||
59 : | |||
60 : | #define VIDOBJ_START_CODE 0x00000100 /* ..0x0000011f */ | ||
61 : | #define VIDOBJLAY_START_CODE 0x00000120 /* ..0x0000012f */ | ||
62 : | #define VISOBJSEQ_START_CODE 0x000001b0 | ||
63 : | #define VISOBJSEQ_STOP_CODE 0x000001b1 /* ??? */ | ||
64 : | #define USERDATA_START_CODE 0x000001b2 | ||
65 : | #define GRPOFVOP_START_CODE 0x000001b3 | ||
66 : | //#define VIDSESERR_ERROR_CODE 0x000001b4 | ||
67 : | #define VISOBJ_START_CODE 0x000001b5 | ||
68 : | //#define SLICE_START_CODE 0x000001b7 | ||
69 : | //#define EXT_START_CODE 0x000001b8 | ||
70 : | |||
71 : | |||
72 : | #define VISOBJ_TYPE_VIDEO 1 | ||
73 : | //#define VISOBJ_TYPE_STILLTEXTURE 2 | ||
74 : | //#define VISOBJ_TYPE_MESH 3 | ||
75 : | //#define VISOBJ_TYPE_FBA 4 | ||
76 : | //#define VISOBJ_TYPE_3DMESH 5 | ||
77 : | |||
78 : | |||
79 : | #define VIDOBJLAY_TYPE_SIMPLE 1 | ||
80 : | //#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE 2 | ||
81 : | #define VIDOBJLAY_TYPE_CORE 3 | ||
82 : | #define VIDOBJLAY_TYPE_MAIN 4 | ||
83 : | |||
84 : | |||
85 : | //#define VIDOBJLAY_AR_SQUARE 1 | ||
86 : | //#define VIDOBJLAY_AR_625TYPE_43 2 | ||
87 : | //#define VIDOBJLAY_AR_525TYPE_43 3 | ||
88 : | //#define VIDOBJLAY_AR_625TYPE_169 8 | ||
89 : | //#define VIDOBJLAY_AR_525TYPE_169 9 | ||
90 : | #define VIDOBJLAY_AR_EXTPAR 15 | ||
91 : | |||
92 : | |||
93 : | #define VIDOBJLAY_SHAPE_RECTANGULAR 0 | ||
94 : | #define VIDOBJLAY_SHAPE_BINARY 1 | ||
95 : | #define VIDOBJLAY_SHAPE_BINARY_ONLY 2 | ||
96 : | #define VIDOBJLAY_SHAPE_GRAYSCALE 3 | ||
97 : | |||
98 : | #define VO_START_CODE 0x8 | ||
99 : | #define VOL_START_CODE 0x12 | ||
100 : | #define VOP_START_CODE 0x1b6 | ||
101 : | |||
102 : | #define READ_MARKER() BitstreamSkip(bs, 1) | ||
103 : | #define WRITE_MARKER() BitstreamPutBit(bs, 1) | ||
104 : | |||
105 : | // vop coding types | ||
106 : | // intra, prediction, backward, sprite, not_coded | ||
107 : | #define I_VOP 0 | ||
108 : | #define P_VOP 1 | ||
109 : | #define B_VOP 2 | ||
110 : | #define S_VOP 3 | ||
111 : | #define N_VOP 4 | ||
112 : | |||
113 : | |||
114 : | typedef struct | ||
115 : | { | ||
116 : | uint32_t bufa; | ||
117 : | uint32_t bufb; | ||
118 : | uint32_t buf; | ||
119 : | uint32_t pos; | ||
120 : | uint32_t *tail; | ||
121 : | uint32_t *start; | ||
122 : | uint32_t length; | ||
123 : | } | ||
124 : | Bitstream; | ||
125 : | |||
126 : | |||
127 : | // header stuff | ||
128 : | int BitstreamReadHeaders(Bitstream * bs, DECODER * dec, uint32_t * rounding, | ||
129 : | uint32_t * quant, uint32_t * fcode, uint32_t * intra_dc_threshold); | ||
130 : | |||
131 : | |||
132 : | void BitstreamWriteVolHeader(Bitstream * const bs, | ||
133 : | h | 69 | const MBParam * pParam); |
134 : | Isibaar | 3 | |
135 : | |||
136 : | void BitstreamWriteVopHeader(Bitstream * const bs, | ||
137 : | h | 69 | const MBParam * pParam); |
138 : | Isibaar | 3 | |
139 : | |||
140 : | /* initialise bitstream structure */ | ||
141 : | |||
142 : | static void __inline BitstreamInit(Bitstream * const bs, | ||
143 : | void * const bitstream, | ||
144 : | uint32_t length) | ||
145 : | { | ||
146 : | uint32_t tmp; | ||
147 : | |||
148 : | bs->start = bs->tail = (uint32_t*)bitstream; | ||
149 : | |||
150 : | tmp = *(uint32_t *)bitstream; | ||
151 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
152 : | BSWAP(tmp); | ||
153 : | #endif | ||
154 : | bs->bufa = tmp; | ||
155 : | |||
156 : | tmp = *((uint32_t *)bitstream + 1); | ||
157 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
158 : | BSWAP(tmp); | ||
159 : | #endif | ||
160 : | bs->bufb = tmp; | ||
161 : | |||
162 : | bs->buf = 0; | ||
163 : | bs->pos = 0; | ||
164 : | bs->length = length; | ||
165 : | } | ||
166 : | |||
167 : | |||
168 : | /* reset bitstream state */ | ||
169 : | |||
170 : | static void __inline BitstreamReset(Bitstream * const bs) | ||
171 : | { | ||
172 : | uint32_t tmp; | ||
173 : | |||
174 : | bs->tail = bs->start; | ||
175 : | |||
176 : | tmp = *bs->start; | ||
177 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
178 : | BSWAP(tmp); | ||
179 : | #endif | ||
180 : | bs->bufa = tmp; | ||
181 : | |||
182 : | tmp = *(bs->start + 1); | ||
183 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
184 : | BSWAP(tmp); | ||
185 : | #endif | ||
186 : | bs->bufb = tmp; | ||
187 : | |||
188 : | bs->buf = 0; | ||
189 : | bs->pos = 0; | ||
190 : | } | ||
191 : | |||
192 : | |||
193 : | /* reads n bits from bitstream without changing the stream pos */ | ||
194 : | |||
195 : | static uint32_t __inline BitstreamShowBits(Bitstream * const bs, | ||
196 : | const uint32_t bits) | ||
197 : | { | ||
198 : | int nbit = (bits + bs->pos) - 32; | ||
199 : | if (nbit > 0) | ||
200 : | { | ||
201 : | return ((bs->bufa & (0xffffffff >> bs->pos)) << nbit) | | ||
202 : | (bs->bufb >> (32 - nbit)); | ||
203 : | } | ||
204 : | else | ||
205 : | { | ||
206 : | return (bs->bufa & (0xffffffff >> bs->pos)) >> (32 - bs->pos - bits); | ||
207 : | } | ||
208 : | } | ||
209 : | |||
210 : | |||
211 : | /* skip n bits forward in bitstream */ | ||
212 : | |||
213 : | static __inline void BitstreamSkip(Bitstream * const bs, const uint32_t bits) | ||
214 : | { | ||
215 : | bs->pos += bits; | ||
216 : | |||
217 : | if (bs->pos >= 32) | ||
218 : | { | ||
219 : | uint32_t tmp; | ||
220 : | |||
221 : | bs->bufa = bs->bufb; | ||
222 : | tmp = *((uint32_t *)bs->tail + 2); | ||
223 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
224 : | BSWAP(tmp); | ||
225 : | #endif | ||
226 : | bs->bufb = tmp; | ||
227 : | bs->tail++; | ||
228 : | bs->pos -= 32; | ||
229 : | } | ||
230 : | } | ||
231 : | |||
232 : | |||
233 : | /* move forward to the next byte boundary */ | ||
234 : | |||
235 : | static __inline void BitstreamByteAlign(Bitstream * const bs) | ||
236 : | { | ||
237 : | uint32_t remainder = bs->pos % 8; | ||
238 : | if (remainder) | ||
239 : | { | ||
240 : | BitstreamSkip(bs, 8 - remainder); | ||
241 : | } | ||
242 : | } | ||
243 : | |||
244 : | |||
245 : | /* bitstream length (unit bits) */ | ||
246 : | |||
247 : | static uint32_t __inline BitstreamPos(const Bitstream * const bs) | ||
248 : | { | ||
249 : | return 8 * ((uint32_t)bs->tail - (uint32_t)bs->start) + bs->pos; | ||
250 : | } | ||
251 : | |||
252 : | |||
253 : | /* flush the bitstream & return length (unit bytes) | ||
254 : | NOTE: assumes no futher bitstream functions will be called. | ||
255 : | */ | ||
256 : | |||
257 : | static uint32_t __inline BitstreamLength(Bitstream * const bs) | ||
258 : | { | ||
259 : | uint32_t len = (uint32_t) bs->tail - (uint32_t) bs->start; | ||
260 : | |||
261 : | if (bs->pos) | ||
262 : | { | ||
263 : | uint32_t b = bs->buf; | ||
264 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
265 : | BSWAP(b); | ||
266 : | #endif | ||
267 : | *bs->tail = b; | ||
268 : | |||
269 : | len += (bs->pos + 7) / 8; | ||
270 : | } | ||
271 : | |||
272 : | return len; | ||
273 : | } | ||
274 : | |||
275 : | |||
276 : | /* move bitstream position forward by n bits and write out buffer if needed */ | ||
277 : | |||
278 : | static void __inline BitstreamForward(Bitstream * const bs, const uint32_t bits) | ||
279 : | { | ||
280 : | bs->pos += bits; | ||
281 : | |||
282 : | if (bs->pos >= 32) | ||
283 : | { | ||
284 : | uint32_t b = bs->buf; | ||
285 : | #ifndef ARCH_IS_BIG_ENDIAN | ||
286 : | BSWAP(b); | ||
287 : | #endif | ||
288 : | *bs->tail++ = b; | ||
289 : | bs->buf = 0; | ||
290 : | bs->pos -= 32; | ||
291 : | } | ||
292 : | } | ||
293 : | |||
294 : | |||
295 : | /* pad bitstream to the next byte boundary */ | ||
296 : | |||
297 : | static void __inline BitstreamPad(Bitstream * const bs) | ||
298 : | { | ||
299 : | uint32_t remainder = bs->pos % 8; | ||
300 : | |||
301 : | if (remainder) | ||
302 : | { | ||
303 : | BitstreamForward(bs, 8 - remainder); | ||
304 : | } | ||
305 : | } | ||
306 : | |||
307 : | |||
308 : | /* read n bits from bitstream */ | ||
309 : | |||
310 : | static uint32_t __inline BitstreamGetBits(Bitstream * const bs, | ||
311 : | const uint32_t n) | ||
312 : | { | ||
313 : | uint32_t ret = BitstreamShowBits(bs, n); | ||
314 : | BitstreamSkip(bs, n); | ||
315 : | return ret; | ||
316 : | } | ||
317 : | |||
318 : | |||
319 : | /* read single bit from bitstream */ | ||
320 : | |||
321 : | static uint32_t __inline BitstreamGetBit(Bitstream * const bs) | ||
322 : | { | ||
323 : | return BitstreamGetBits(bs, 1); | ||
324 : | } | ||
325 : | |||
326 : | |||
327 : | /* write single bit to bitstream */ | ||
328 : | |||
329 : | static void __inline BitstreamPutBit(Bitstream * const bs, | ||
330 : | const uint32_t bit) | ||
331 : | { | ||
332 : | if (bit) | ||
333 : | bs->buf |= (0x80000000 >> bs->pos); | ||
334 : | |||
335 : | BitstreamForward(bs, 1); | ||
336 : | } | ||
337 : | |||
338 : | |||
339 : | /* write n bits to bitstream */ | ||
340 : | |||
341 : | static void __inline BitstreamPutBits(Bitstream * const bs, | ||
342 : | const uint32_t value, | ||
343 : | const uint32_t size) | ||
344 : | { | ||
345 : | uint32_t shift = 32 - bs->pos - size; | ||
346 : | |||
347 : | if (shift <= 32) { | ||
348 : | bs->buf |= value << shift; | ||
349 : | BitstreamForward(bs, size); | ||
350 : | } else { | ||
351 : | uint32_t remainder; | ||
352 : | |||
353 : | shift = size - (32 - bs->pos); | ||
354 : | bs->buf |= value >> shift; | ||
355 : | BitstreamForward(bs, size - shift); | ||
356 : | remainder = shift; | ||
357 : | |||
358 : | shift = 32 - shift; | ||
359 : | |||
360 : | bs->buf |= value << shift; | ||
361 : | BitstreamForward(bs, remainder); | ||
362 : | } | ||
363 : | } | ||
364 : | |||
365 : | #endif /* _BITSTREAM_H_ */ |
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