41 |
* * |
* * |
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* Revision history: * |
* Revision history: * |
43 |
* * |
* * |
44 |
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* 28.06.2002 addded BitstreamNumBitsToByteAlign() * |
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* BitstreamShowBitsFromByteAlign() * |
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* 26.03.2002 interlacing support - modified putvol/vopheaders paramters * |
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* 04.03.2002 putbits speedup (Isibaar) * |
* 04.03.2002 putbits speedup (Isibaar) * |
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* 03.03.2002 merged BITREADER and BITWRITER (Isibaar) * |
* 03.03.2002 merged BITREADER and BITWRITER (Isibaar) * |
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* 16.12.2001 inital version * |
* 16.12.2001 inital version * |
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// comment any #defs we dont use |
// comment any #defs we dont use |
61 |
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/* start codes */ |
63 |
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#define VIDOBJ_START_CODE 0x00000100 /* ..0x0000011f */ |
#define VIDOBJ_START_CODE 0x00000100 /* ..0x0000011f */ |
65 |
#define VIDOBJLAY_START_CODE 0x00000120 /* ..0x0000012f */ |
#define VIDOBJLAY_START_CODE 0x00000120 /* ..0x0000012f */ |
66 |
#define VISOBJSEQ_START_CODE 0x000001b0 |
#define VISOBJSEQ_START_CODE 0x000001b0 |
69 |
#define GRPOFVOP_START_CODE 0x000001b3 |
#define GRPOFVOP_START_CODE 0x000001b3 |
70 |
//#define VIDSESERR_ERROR_CODE 0x000001b4 |
//#define VIDSESERR_ERROR_CODE 0x000001b4 |
71 |
#define VISOBJ_START_CODE 0x000001b5 |
#define VISOBJ_START_CODE 0x000001b5 |
72 |
//#define SLICE_START_CODE 0x000001b7 |
#define VOP_START_CODE 0x000001b6 |
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//#define EXT_START_CODE 0x000001b8 |
//#define STUFFING_START_CODE 0x000001c3 |
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76 |
#define VISOBJ_TYPE_VIDEO 1 |
#define VISOBJ_TYPE_VIDEO 1 |
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//#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE 2 |
//#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE 2 |
85 |
#define VIDOBJLAY_TYPE_CORE 3 |
#define VIDOBJLAY_TYPE_CORE 3 |
86 |
#define VIDOBJLAY_TYPE_MAIN 4 |
#define VIDOBJLAY_TYPE_MAIN 4 |
87 |
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//#define VIDOBJLAY_TYPE_NBIT 5 |
88 |
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//#define VIDOBJLAY_TYPE_ANIM_TEXT 6 |
89 |
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//#define VIDOBJLAY_TYPE_ANIM_MESH 7 |
90 |
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//#define VIDOBJLAY_TYPE_SIMPLE_FACE 8 |
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//#define VIDOBJLAY_TYPE_STILL_SCALABLE 9 |
92 |
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#define VIDOBJLAY_TYPE_ART_SIMPLE 10 |
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//#define VIDOBJLAY_TYPE_CORE_SCALABLE 11 |
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#define VIDOBJLAY_TYPE_ACE 12 |
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//#define VIDOBJLAY_TYPE_SIMPLE_FBA 13 |
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//#define VIDOBJLAY_AR_SQUARE 1 |
//#define VIDOBJLAY_AR_SQUARE 1 |
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#define VIDOBJLAY_SHAPE_BINARY_ONLY 2 |
#define VIDOBJLAY_SHAPE_BINARY_ONLY 2 |
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#define VIDOBJLAY_SHAPE_GRAYSCALE 3 |
#define VIDOBJLAY_SHAPE_GRAYSCALE 3 |
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111 |
#define VO_START_CODE 0x8 |
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112 |
#define VOL_START_CODE 0x12 |
#define SPRITE_NONE 0 |
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#define VOP_START_CODE 0x1b6 |
#define SPRITE_STATIC 1 |
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#define SPRITE_GMC 2 |
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#define READ_MARKER() BitstreamSkip(bs, 1) |
#define READ_MARKER() BitstreamSkip(bs, 1) |
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#define WRITE_MARKER() BitstreamPutBit(bs, 1) |
#define WRITE_MARKER() BitstreamPutBit(bs, 1) |
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#define S_VOP 3 |
#define S_VOP 3 |
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#define N_VOP 4 |
#define N_VOP 4 |
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// resync-specific |
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#define NUMBITS_VP_RESYNC_MARKER 17 |
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#define RESYNC_MARKER 1 |
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typedef struct |
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{ |
int read_video_packet_header(Bitstream *bs, |
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uint32_t bufa; |
DECODER * dec, |
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uint32_t bufb; |
const int addbits, |
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uint32_t buf; |
int * quant, |
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uint32_t pos; |
int * fcode_forward, |
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uint32_t *tail; |
int * fcode_backward, |
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uint32_t *start; |
int * intra_dc_threshold); |
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uint32_t length; |
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} |
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Bitstream; |
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// header stuff |
// header stuff |
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int BitstreamReadHeaders(Bitstream * bs, DECODER * dec, uint32_t * rounding, |
int BitstreamReadHeaders(Bitstream * bs, |
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uint32_t * quant, uint32_t * fcode, uint32_t * intra_dc_threshold); |
DECODER * dec, |
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uint32_t * rounding, |
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uint32_t * reduced_resolution, |
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uint32_t * quant, |
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uint32_t * fcode_forward, |
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uint32_t * fcode_backward, |
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uint32_t * intra_dc_threshold, |
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WARPPOINTS * gmc_warp); |
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void BitstreamWriteVolHeader(Bitstream * const bs, |
void BitstreamWriteVolHeader(Bitstream * const bs, |
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const int width, |
const MBParam * pParam); |
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const int height, |
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const int quant_type); |
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void BitstreamWriteVopHeader(Bitstream * const bs, |
void BitstreamWriteVopHeader(Bitstream * const bs, |
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VOP_TYPE prediction_type, |
const MBParam * pParam, |
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const int rounding_type, |
const FRAMEINFO * const frame, |
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const uint32_t quant, |
int vop_coded); |
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const uint32_t fcode); |
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void BitstreamWriteUserData(Bitstream * const bs, |
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uint8_t * data, |
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const int length); |
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/* initialise bitstream structure */ |
/* initialise bitstream structure */ |
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static void __inline BitstreamInit(Bitstream * const bs, |
static void __inline |
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BitstreamInit(Bitstream * const bs, |
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void * const bitstream, |
void * const bitstream, |
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uint32_t length) |
uint32_t length) |
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{ |
{ |
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/* reset bitstream state */ |
/* reset bitstream state */ |
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static void __inline BitstreamReset(Bitstream * const bs) |
static void __inline |
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BitstreamReset(Bitstream * const bs) |
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{ |
{ |
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uint32_t tmp; |
uint32_t tmp; |
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/* reads n bits from bitstream without changing the stream pos */ |
/* reads n bits from bitstream without changing the stream pos */ |
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static uint32_t __inline BitstreamShowBits(Bitstream * const bs, |
static uint32_t __inline |
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BitstreamShowBits(Bitstream * const bs, |
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const uint32_t bits) |
const uint32_t bits) |
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{ |
{ |
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int nbit = (bits + bs->pos) - 32; |
int nbit = (bits + bs->pos) - 32; |
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if (nbit > 0) |
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{ |
if (nbit > 0) { |
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return ((bs->bufa & (0xffffffff >> bs->pos)) << nbit) | |
return ((bs->bufa & (0xffffffff >> bs->pos)) << nbit) | (bs-> |
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(bs->bufb >> (32 - nbit)); |
bufb >> (32 - |
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} |
nbit)); |
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else |
} else { |
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{ |
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return (bs->bufa & (0xffffffff >> bs->pos)) >> (32 - bs->pos - bits); |
return (bs->bufa & (0xffffffff >> bs->pos)) >> (32 - bs->pos - bits); |
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} |
} |
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} |
} |
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/* skip n bits forward in bitstream */ |
/* skip n bits forward in bitstream */ |
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static __inline void BitstreamSkip(Bitstream * const bs, const uint32_t bits) |
static __inline void |
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BitstreamSkip(Bitstream * const bs, |
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const uint32_t bits) |
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{ |
{ |
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bs->pos += bits; |
bs->pos += bits; |
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if (bs->pos >= 32) |
if (bs->pos >= 32) { |
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{ |
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uint32_t tmp; |
uint32_t tmp; |
250 |
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bs->bufa = bs->bufb; |
bs->bufa = bs->bufb; |
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} |
} |
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// number of bits to next byte alignment |
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static __inline uint32_t |
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BitstreamNumBitsToByteAlign(Bitstream *bs) |
266 |
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{ |
267 |
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uint32_t n = (32 - bs->pos) % 8; |
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return n == 0 ? 8 : n; |
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} |
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// show nbits from next byte alignment |
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static __inline uint32_t |
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BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits) |
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{ |
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int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs); |
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int nbit = (bits + bspos) - 32; |
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279 |
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if (bspos >= 32) { |
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return bs->bufb >> (32 - nbit); |
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} else if (nbit > 0) { |
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return ((bs->bufa & (0xffffffff >> bspos)) << nbit) | (bs-> |
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bufb >> (32 - |
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nbit)); |
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} else { |
286 |
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return (bs->bufa & (0xffffffff >> bspos)) >> (32 - bspos - bits); |
287 |
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} |
288 |
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289 |
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} |
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/* move forward to the next byte boundary */ |
/* move forward to the next byte boundary */ |
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static __inline void BitstreamByteAlign(Bitstream * const bs) |
static __inline void |
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BitstreamByteAlign(Bitstream * const bs) |
297 |
{ |
{ |
298 |
uint32_t remainder = bs->pos % 8; |
uint32_t remainder = bs->pos % 8; |
299 |
if (remainder) |
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300 |
{ |
if (remainder) { |
301 |
BitstreamSkip(bs, 8 - remainder); |
BitstreamSkip(bs, 8 - remainder); |
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} |
} |
303 |
} |
} |
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306 |
/* bitstream length (unit bits) */ |
/* bitstream length (unit bits) */ |
307 |
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308 |
static uint32_t __inline BitstreamPos(const Bitstream * const bs) |
static uint32_t __inline |
309 |
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BitstreamPos(const Bitstream * const bs) |
310 |
{ |
{ |
311 |
return 8 * ((uint32_t)bs->tail - (uint32_t)bs->start) + bs->pos; |
return 8 * ((ptr_t)bs->tail - (ptr_t)bs->start) + bs->pos; |
312 |
} |
} |
313 |
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316 |
NOTE: assumes no futher bitstream functions will be called. |
NOTE: assumes no futher bitstream functions will be called. |
317 |
*/ |
*/ |
318 |
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319 |
static uint32_t __inline BitstreamLength(Bitstream * const bs) |
static uint32_t __inline |
320 |
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BitstreamLength(Bitstream * const bs) |
321 |
{ |
{ |
322 |
uint32_t len = (uint32_t) bs->tail - (uint32_t) bs->start; |
uint32_t len = (ptr_t) bs->tail - (ptr_t) bs->start; |
323 |
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324 |
if (bs->pos) |
if (bs->pos) { |
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{ |
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325 |
uint32_t b = bs->buf; |
uint32_t b = bs->buf; |
326 |
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327 |
#ifndef ARCH_IS_BIG_ENDIAN |
#ifndef ARCH_IS_BIG_ENDIAN |
328 |
BSWAP(b); |
BSWAP(b); |
329 |
#endif |
#endif |
338 |
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339 |
/* 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 */ |
340 |
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341 |
static void __inline BitstreamForward(Bitstream * const bs, const uint32_t bits) |
static void __inline |
342 |
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BitstreamForward(Bitstream * const bs, |
343 |
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const uint32_t bits) |
344 |
{ |
{ |
345 |
bs->pos += bits; |
bs->pos += bits; |
346 |
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347 |
if (bs->pos >= 32) |
if (bs->pos >= 32) { |
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{ |
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348 |
uint32_t b = bs->buf; |
uint32_t b = bs->buf; |
349 |
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350 |
#ifndef ARCH_IS_BIG_ENDIAN |
#ifndef ARCH_IS_BIG_ENDIAN |
351 |
BSWAP(b); |
BSWAP(b); |
352 |
#endif |
#endif |
357 |
} |
} |
358 |
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359 |
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/* pad bitstream to the next byte boundary */ |
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static void __inline BitstreamPad(Bitstream * const bs) |
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{ |
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uint32_t remainder = bs->pos % 8; |
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if (remainder) |
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{ |
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BitstreamForward(bs, 8 - remainder); |
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} |
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} |
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360 |
/* read n bits from bitstream */ |
/* read n bits from bitstream */ |
361 |
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362 |
static uint32_t __inline BitstreamGetBits(Bitstream * const bs, |
static uint32_t __inline |
363 |
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BitstreamGetBits(Bitstream * const bs, |
364 |
const uint32_t n) |
const uint32_t n) |
365 |
{ |
{ |
366 |
uint32_t ret = BitstreamShowBits(bs, n); |
uint32_t ret = BitstreamShowBits(bs, n); |
367 |
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368 |
BitstreamSkip(bs, n); |
BitstreamSkip(bs, n); |
369 |
return ret; |
return ret; |
370 |
} |
} |
372 |
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373 |
/* read single bit from bitstream */ |
/* read single bit from bitstream */ |
374 |
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375 |
static uint32_t __inline BitstreamGetBit(Bitstream * const bs) |
static uint32_t __inline |
376 |
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BitstreamGetBit(Bitstream * const bs) |
377 |
{ |
{ |
378 |
return BitstreamGetBits(bs, 1); |
return BitstreamGetBits(bs, 1); |
379 |
} |
} |
381 |
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382 |
/* write single bit to bitstream */ |
/* write single bit to bitstream */ |
383 |
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384 |
static void __inline BitstreamPutBit(Bitstream * const bs, |
static void __inline |
385 |
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BitstreamPutBit(Bitstream * const bs, |
386 |
const uint32_t bit) |
const uint32_t bit) |
387 |
{ |
{ |
388 |
if (bit) |
if (bit) |
394 |
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395 |
/* write n bits to bitstream */ |
/* write n bits to bitstream */ |
396 |
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397 |
static void __inline BitstreamPutBits(Bitstream * const bs, |
static void __inline |
398 |
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BitstreamPutBits(Bitstream * const bs, |
399 |
const uint32_t value, |
const uint32_t value, |
400 |
const uint32_t size) |
const uint32_t size) |
401 |
{ |
{ |
419 |
} |
} |
420 |
} |
} |
421 |
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422 |
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423 |
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static const int stuffing_codes[8] = |
424 |
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{ |
425 |
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/* nbits stuffing code */ |
426 |
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0, /* 1 0 */ |
427 |
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1, /* 2 01 */ |
428 |
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3, /* 3 011 */ |
429 |
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7, /* 4 0111 */ |
430 |
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0xf, /* 5 01111 */ |
431 |
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0x1f, /* 6 011111 */ |
432 |
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0x3f, /* 7 0111111 */ |
433 |
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0x7f, /* 8 01111111 */ |
434 |
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}; |
435 |
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436 |
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/* pad bitstream to the next byte boundary */ |
437 |
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438 |
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static void __inline |
439 |
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BitstreamPad(Bitstream * const bs) |
440 |
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{ |
441 |
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int bits = 8 - (bs->pos % 8); |
442 |
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if (bits < 8) |
443 |
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{ |
444 |
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BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); |
445 |
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} |
446 |
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} |
447 |
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448 |
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449 |
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/* pad bitstream to the next byte boundary |
450 |
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alway pad: even if currently at the byte boundary */ |
451 |
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452 |
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static void __inline |
453 |
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BitstreamPadAlways(Bitstream * const bs) |
454 |
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{ |
455 |
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int bits = 8 - (bs->pos % 8); |
456 |
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BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); |
457 |
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} |
458 |
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459 |
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460 |
#endif /* _BITSTREAM_H_ */ |
#endif /* _BITSTREAM_H_ */ |