112 |
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113 |
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114 |
// header stuff |
// header stuff |
115 |
int BitstreamReadHeaders(Bitstream * bs, DECODER * dec, uint32_t * rounding, |
int BitstreamReadHeaders(Bitstream * bs, |
116 |
uint32_t * quant, uint32_t * fcode, uint32_t * intra_dc_threshold); |
DECODER * dec, |
117 |
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uint32_t * rounding, |
118 |
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uint32_t * quant, |
119 |
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uint32_t * fcode_forward, |
120 |
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uint32_t * fcode_backward, |
121 |
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uint32_t * intra_dc_threshold); |
122 |
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123 |
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124 |
void BitstreamWriteVolHeader(Bitstream * const bs, |
void BitstreamWriteVolHeader(Bitstream * const bs, |
131 |
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132 |
/* initialise bitstream structure */ |
/* initialise bitstream structure */ |
133 |
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134 |
static void __inline BitstreamInit(Bitstream * const bs, |
static void __inline |
135 |
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BitstreamInit(Bitstream * const bs, |
136 |
void * const bitstream, |
void * const bitstream, |
137 |
uint32_t length) |
uint32_t length) |
138 |
{ |
{ |
160 |
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161 |
/* reset bitstream state */ |
/* reset bitstream state */ |
162 |
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163 |
static void __inline BitstreamReset(Bitstream * const bs) |
static void __inline |
164 |
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BitstreamReset(Bitstream * const bs) |
165 |
{ |
{ |
166 |
uint32_t tmp; |
uint32_t tmp; |
167 |
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186 |
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187 |
/* reads n bits from bitstream without changing the stream pos */ |
/* reads n bits from bitstream without changing the stream pos */ |
188 |
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189 |
static uint32_t __inline BitstreamShowBits(Bitstream * const bs, |
static uint32_t __inline |
190 |
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BitstreamShowBits(Bitstream * const bs, |
191 |
const uint32_t bits) |
const uint32_t bits) |
192 |
{ |
{ |
193 |
int nbit = (bits + bs->pos) - 32; |
int nbit = (bits + bs->pos) - 32; |
194 |
if (nbit > 0) |
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195 |
{ |
if (nbit > 0) { |
196 |
return ((bs->bufa & (0xffffffff >> bs->pos)) << nbit) | |
return ((bs->bufa & (0xffffffff >> bs->pos)) << nbit) | (bs-> |
197 |
(bs->bufb >> (32 - nbit)); |
bufb >> (32 - |
198 |
} |
nbit)); |
199 |
else |
} else { |
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{ |
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200 |
return (bs->bufa & (0xffffffff >> bs->pos)) >> (32 - bs->pos - bits); |
return (bs->bufa & (0xffffffff >> bs->pos)) >> (32 - bs->pos - bits); |
201 |
} |
} |
202 |
} |
} |
204 |
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205 |
/* skip n bits forward in bitstream */ |
/* skip n bits forward in bitstream */ |
206 |
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207 |
static __inline void BitstreamSkip(Bitstream * const bs, const uint32_t bits) |
static __inline void |
208 |
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BitstreamSkip(Bitstream * const bs, |
209 |
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const uint32_t bits) |
210 |
{ |
{ |
211 |
bs->pos += bits; |
bs->pos += bits; |
212 |
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213 |
if (bs->pos >= 32) |
if (bs->pos >= 32) { |
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{ |
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214 |
uint32_t tmp; |
uint32_t tmp; |
215 |
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216 |
bs->bufa = bs->bufb; |
bs->bufa = bs->bufb; |
227 |
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228 |
/* move forward to the next byte boundary */ |
/* move forward to the next byte boundary */ |
229 |
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230 |
static __inline void BitstreamByteAlign(Bitstream * const bs) |
static __inline void |
231 |
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BitstreamByteAlign(Bitstream * const bs) |
232 |
{ |
{ |
233 |
uint32_t remainder = bs->pos % 8; |
uint32_t remainder = bs->pos % 8; |
234 |
if (remainder) |
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235 |
{ |
if (remainder) { |
236 |
BitstreamSkip(bs, 8 - remainder); |
BitstreamSkip(bs, 8 - remainder); |
237 |
} |
} |
238 |
} |
} |
240 |
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241 |
/* bitstream length (unit bits) */ |
/* bitstream length (unit bits) */ |
242 |
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243 |
static uint32_t __inline BitstreamPos(const Bitstream * const bs) |
static uint32_t __inline |
244 |
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BitstreamPos(const Bitstream * const bs) |
245 |
{ |
{ |
246 |
return 8 * ((uint32_t)bs->tail - (uint32_t)bs->start) + bs->pos; |
return 8 * ((uint32_t)bs->tail - (uint32_t)bs->start) + bs->pos; |
247 |
} |
} |
251 |
NOTE: assumes no futher bitstream functions will be called. |
NOTE: assumes no futher bitstream functions will be called. |
252 |
*/ |
*/ |
253 |
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254 |
static uint32_t __inline BitstreamLength(Bitstream * const bs) |
static uint32_t __inline |
255 |
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BitstreamLength(Bitstream * const bs) |
256 |
{ |
{ |
257 |
uint32_t len = (uint32_t) bs->tail - (uint32_t) bs->start; |
uint32_t len = (uint32_t) bs->tail - (uint32_t) bs->start; |
258 |
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259 |
if (bs->pos) |
if (bs->pos) { |
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{ |
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260 |
uint32_t b = bs->buf; |
uint32_t b = bs->buf; |
261 |
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262 |
#ifndef ARCH_IS_BIG_ENDIAN |
#ifndef ARCH_IS_BIG_ENDIAN |
263 |
BSWAP(b); |
BSWAP(b); |
264 |
#endif |
#endif |
273 |
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274 |
/* move bitstream position forward by n bits and write out buffer if needed */ |
/* move bitstream position forward by n bits and write out buffer if needed */ |
275 |
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276 |
static void __inline BitstreamForward(Bitstream * const bs, const uint32_t bits) |
static void __inline |
277 |
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BitstreamForward(Bitstream * const bs, |
278 |
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const uint32_t bits) |
279 |
{ |
{ |
280 |
bs->pos += bits; |
bs->pos += bits; |
281 |
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282 |
if (bs->pos >= 32) |
if (bs->pos >= 32) { |
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{ |
|
283 |
uint32_t b = bs->buf; |
uint32_t b = bs->buf; |
284 |
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285 |
#ifndef ARCH_IS_BIG_ENDIAN |
#ifndef ARCH_IS_BIG_ENDIAN |
286 |
BSWAP(b); |
BSWAP(b); |
287 |
#endif |
#endif |
294 |
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295 |
/* pad bitstream to the next byte boundary */ |
/* pad bitstream to the next byte boundary */ |
296 |
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297 |
static void __inline BitstreamPad(Bitstream * const bs) |
static void __inline |
298 |
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BitstreamPad(Bitstream * const bs) |
299 |
{ |
{ |
300 |
uint32_t remainder = bs->pos % 8; |
uint32_t remainder = bs->pos % 8; |
301 |
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302 |
if (remainder) |
if (remainder) { |
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{ |
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303 |
BitstreamForward(bs, 8 - remainder); |
BitstreamForward(bs, 8 - remainder); |
304 |
} |
} |
305 |
} |
} |
307 |
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308 |
/* read n bits from bitstream */ |
/* read n bits from bitstream */ |
309 |
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310 |
static uint32_t __inline BitstreamGetBits(Bitstream * const bs, |
static uint32_t __inline |
311 |
|
BitstreamGetBits(Bitstream * const bs, |
312 |
const uint32_t n) |
const uint32_t n) |
313 |
{ |
{ |
314 |
uint32_t ret = BitstreamShowBits(bs, n); |
uint32_t ret = BitstreamShowBits(bs, n); |
315 |
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|
316 |
BitstreamSkip(bs, n); |
BitstreamSkip(bs, n); |
317 |
return ret; |
return ret; |
318 |
} |
} |
320 |
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321 |
/* read single bit from bitstream */ |
/* read single bit from bitstream */ |
322 |
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323 |
static uint32_t __inline BitstreamGetBit(Bitstream * const bs) |
static uint32_t __inline |
324 |
|
BitstreamGetBit(Bitstream * const bs) |
325 |
{ |
{ |
326 |
return BitstreamGetBits(bs, 1); |
return BitstreamGetBits(bs, 1); |
327 |
} |
} |
329 |
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|
330 |
/* write single bit to bitstream */ |
/* write single bit to bitstream */ |
331 |
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332 |
static void __inline BitstreamPutBit(Bitstream * const bs, |
static void __inline |
333 |
|
BitstreamPutBit(Bitstream * const bs, |
334 |
const uint32_t bit) |
const uint32_t bit) |
335 |
{ |
{ |
336 |
if (bit) |
if (bit) |
342 |
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|
343 |
/* write n bits to bitstream */ |
/* write n bits to bitstream */ |
344 |
|
|
345 |
static void __inline BitstreamPutBits(Bitstream * const bs, |
static void __inline |
346 |
|
BitstreamPutBits(Bitstream * const bs, |
347 |
const uint32_t value, |
const uint32_t value, |
348 |
const uint32_t size) |
const uint32_t size) |
349 |
{ |
{ |