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* along with this program ; if not, write to the Free Software |
* along with this program ; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
* |
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* $Id: bitstream.h,v 1.23 2006-04-14 07:24:47 Skal Exp $ |
* $Id$ |
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* |
* |
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****************************************************************************/ |
****************************************************************************/ |
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|
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|
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void BitstreamWriteVolHeader(Bitstream * const bs, |
void BitstreamWriteVolHeader(Bitstream * const bs, |
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const MBParam * pParam, |
const MBParam * pParam, |
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const FRAMEINFO * const frame); |
const FRAMEINFO * const frame, |
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const int num_slices); |
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|
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void BitstreamWriteVopHeader(Bitstream * const bs, |
void BitstreamWriteVopHeader(Bitstream * const bs, |
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const MBParam * pParam, |
const MBParam * pParam, |
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const FRAMEINFO * const frame, |
const FRAMEINFO * const frame, |
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int mbnum); |
int mbnum); |
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|
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/***************************************************************************** |
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* Bitstream |
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****************************************************************************/ |
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/* Input buffer should be readable as full chunks of 8bytes, including |
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the end of the buffer. Padding might be appropriate. If only chunks |
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of 4bytes are applicable, define XVID_SAFE_BS_TAIL. Note that this will |
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slow decoding, so consider this as a last-resort solution */ |
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#ifndef XVID_HAVE_PADDED_BS_BUFFER |
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#define XVID_SAFE_BS_TAIL |
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#endif |
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|
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/* initialise bitstream structure */ |
/* initialise bitstream structure */ |
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|
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static void __inline |
static void __inline |
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#endif |
#endif |
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bs->bufb = tmp; |
bs->bufb = tmp; |
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|
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bs->pos = bs->initpos = bitpos*8; |
bs->pos = bs->initpos = (uint32_t) bitpos*8; |
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/* preserve the intervening bytes */ |
/* preserve the intervening bytes */ |
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if (bs->initpos > 0) |
if (bs->initpos > 0) |
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bs->buf = bs->bufa & (0xffffffff << (32 - bs->initpos)); |
bs->buf = bs->bufa & (0xffffffff << (32 - bs->initpos)); |
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uint32_t tmp; |
uint32_t tmp; |
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|
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bs->bufa = bs->bufb; |
bs->bufa = bs->bufb; |
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#if defined(XVID_SAFE_BS_TAIL) |
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if (bs->tail<(bs->start+((bs->length+3)>>2))) |
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#endif |
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{ |
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tmp = *((uint32_t *) bs->tail + 2); |
tmp = *((uint32_t *) bs->tail + 2); |
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#ifndef ARCH_IS_BIG_ENDIAN |
#ifndef ARCH_IS_BIG_ENDIAN |
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BSWAP(tmp); |
BSWAP(tmp); |
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#endif |
#endif |
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bs->bufb = tmp; |
bs->bufb = tmp; |
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bs->tail++; |
bs->tail++; |
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} |
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#if defined(XVID_SAFE_BS_TAIL) |
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else { |
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bs->bufb = 0; |
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} |
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#endif |
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bs->pos -= 32; |
bs->pos -= 32; |
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} |
} |
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} |
} |