--- bitstream.h	2002/06/12 20:38:40	1.6
+++ bitstream.h	2002/11/02 15:52:30	1.10.2.2
@@ -41,7 +41,9 @@
   *																			   *	
   *  Revision history:                                                         *
   *                                                                            *
-  *  26.03.2002 interlacing support - modified putvol/vopheaders paramters
+  *  28.06.2002 addded BitstreamNumBitsToByteAlign()                           *
+  *                    BitstreamShowBitsFromByteAlign()                        *
+  *  26.03.2002 interlacing support - modified putvol/vopheaders paramters     *
   *  04.03.2002 putbits speedup (Isibaar)                                      *
   *  03.03.2002 merged BITREADER and BITWRITER (Isibaar)                       *
   *	 16.12.2001	inital version                                           	   *
@@ -110,6 +112,14 @@
 #define S_VOP	3
 #define N_VOP	4
 
+// resync-specific
+#define NUMBITS_VP_RESYNC_MARKER  17
+#define RESYNC_MARKER 1
+
+
+int
+read_video_packet_header(Bitstream *bs, const int addbits, int * quant);
+
 
 // header stuff
 int BitstreamReadHeaders(Bitstream * bs,
@@ -123,11 +133,16 @@
 
 void BitstreamWriteVolHeader(Bitstream * const bs,
 							 const MBParam * pParam,
-							 const FRAMEINFO * frame);
+							 const FRAMEINFO * const frame);
 
 void BitstreamWriteVopHeader(Bitstream * const bs,
 							 const MBParam * pParam,
-							 const FRAMEINFO * frame);
+							 const FRAMEINFO * const frame,
+							 int vop_coded);
+
+void BitstreamWriteUserData(Bitstream * const bs, 
+							uint8_t * data, 
+							const int length);
 
 /* initialise bitstream structure */
 
@@ -225,6 +240,36 @@
 }
 
 
+// number of bits to next byte alignment
+static __inline uint32_t 
+BitstreamNumBitsToByteAlign(Bitstream *bs)
+{
+	uint32_t n = (32 - bs->pos) % 8;
+	return n == 0 ? 8 : n;
+}
+
+
+// show nbits from next byte alignment
+static __inline uint32_t
+BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)
+{
+	int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs);
+	int nbit = (bits + bspos) - 32;
+
+	if (bspos >= 32) {
+		return bs->bufb >> (32 - nbit);
+	} else	if (nbit > 0) {
+		return ((bs->bufa & (0xffffffff >> bspos)) << nbit) | (bs->
+																 bufb >> (32 -
+																		  nbit));
+	} else {
+		return (bs->bufa & (0xffffffff >> bspos)) >> (32 - bspos - bits);
+	}
+
+}
+
+
+
 /* move forward to the next byte boundary */
 
 static __inline void
@@ -243,7 +288,7 @@
 static uint32_t __inline
 BitstreamPos(const Bitstream * const bs)
 {
-	return 8 * ((uint32_t) bs->tail - (uint32_t) bs->start) + bs->pos;
+	return 8 * ((ptr_t)bs->tail - (ptr_t)bs->start) + bs->pos;
 }
 
 
@@ -254,7 +299,7 @@
 static uint32_t __inline
 BitstreamLength(Bitstream * const bs)
 {
-	uint32_t len = (uint32_t) bs->tail - (uint32_t) bs->start;
+	uint32_t len = (ptr_t) bs->tail - (ptr_t) bs->start;
 
 	if (bs->pos) {
 		uint32_t b = bs->buf;
@@ -292,19 +337,6 @@
 }
 
 
-/* pad bitstream to the next byte boundary */
-
-static void __inline
-BitstreamPad(Bitstream * const bs)
-{
-	uint32_t remainder = bs->pos % 8;
-
-	if (remainder) {
-		BitstreamForward(bs, 8 - remainder);
-	}
-}
-
-
 /* read n bits from bitstream */
 
 static uint32_t __inline
@@ -367,4 +399,42 @@
 	}
 }
 
+
+static const int stuffing_codes[8] =
+{
+	        /* nbits     stuffing code */
+	0,		/* 1          0 */
+	1,		/* 2          01 */
+	3,		/* 3          011 */
+	7,		/* 4          0111 */
+	0xf,	/* 5          01111 */
+	0x1f,	/* 6          011111 */
+	0x3f,   /* 7          0111111 */
+	0x7f,	/* 8          01111111 */
+};
+
+/* pad bitstream to the next byte boundary */
+
+static void __inline
+BitstreamPad(Bitstream * const bs)
+{
+	int bits = 8 - (bs->pos % 8);
+	if (bits < 8)
+	{
+		BitstreamPutBits(bs, stuffing_codes[bits - 1], bits);
+	}
+}
+
+
+/* pad bitstream to the next byte boundary 
+   alway pad: even if currently at the byte boundary */
+
+static void __inline
+BitstreamPadAlways(Bitstream * const bs)
+{
+	int bits = 8 - (bs->pos % 8);
+	BitstreamPutBits(bs, stuffing_codes[bits - 1], bits);
+}
+
+
 #endif							/* _BITSTREAM_H_ */