/**
 * @file common.h
 * common internal api header.
 */

#ifndef COMMON_H
#define COMMON_H

#if defined(WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
#	define CONFIG_WIN32
#endif

//#define ALT_BITSTREAM_WRITER
//#define ALIGNED_BITSTREAM_WRITER

#define ALT_BITSTREAM_READER
//#define LIBMPEG2_BITSTREAM_READER
//#define A32_BITSTREAM_READER
#define LIBMPEG2_BITSTREAM_READER_HACK //add BERO

#ifdef HAVE_AV_CONFIG_H
/* only include the following when compiling package */
#	include "config.h"

#	include <stdlib.h>
#	include <stdio.h>
#	include <string.h>
#	include <ctype.h>
#	ifndef __BEOS__
#		include <errno.h>
#	else
#		include "berrno.h"
#	endif
#	include <math.h>

#	ifndef ENODATA
#		define ENODATA  61
#	endif

#ifndef M_PI
#define M_PI	3.14159265358979323846
#endif

#include <stddef.h>
#ifndef offsetof
# define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
#endif

#define AVOPTION_CODEC_BOOL(name, help, field) \
	{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_BOOL }
#define AVOPTION_CODEC_DOUBLE(name, help, field, minv, maxv, defval) \
	{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_DOUBLE, minv, maxv, defval }
#define AVOPTION_CODEC_FLAG(name, help, field, flag, defval) \
	{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_FLAG, flag, 0, defval }
#define AVOPTION_CODEC_INT(name, help, field, minv, maxv, defval) \
	{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_INT, minv, maxv, defval }
#define AVOPTION_CODEC_STRING(name, help, field, str, val) \
	{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_STRING, .defval = val, .defstr = str }
#define AVOPTION_CODEC_RCOVERRIDE(name, help, field) \
	{ name, help, offsetof(AVCodecContext, field), FF_OPT_TYPE_RCOVERRIDE, .defval = 0, .defstr = NULL }
#define AVOPTION_SUB(ptr) { .name = NULL, .help = (const char*)ptr }
#define AVOPTION_END() AVOPTION_SUB(NULL)

struct AVOption;
#ifdef HAVE_MMX
extern const struct AVOption avoptions_common[3 + 5];
#else
extern const struct AVOption avoptions_common[3];
#endif
extern const struct AVOption avoptions_workaround_bug[11];

#endif /* HAVE_AV_CONFIG_H */

/* Suppress restrict if it was not defined in config.h.  */
#ifndef restrict
#	define restrict
#endif

#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
#	define always_inline __attribute__((always_inline)) inline
#else
#	define always_inline inline
#endif

#ifdef CONFIG_WIN32

/* windows */

typedef unsigned short uint16_t;
typedef signed short int16_t;
typedef unsigned char uint8_t;
typedef unsigned int uint32_t;
typedef unsigned __int64 uint64_t;
typedef signed char int8_t;
typedef signed int int32_t;
typedef signed __int64 int64_t;

#	ifndef __MINGW32__
#		define int64_t_C(c)	 (c ## i64)
#		define uint64_t_C(c)	(c ## i64)

#		define inline __inline

#	else
#		define int64_t_C(c)	 (c ## LL)
#		define uint64_t_C(c)	(c ## ULL)
#	endif /* __MINGW32__ */

#	ifdef _DEBUG
#		define DEBUG
#	endif

#	define snprintf _snprintf
#	define vsnprintf _vsnprintf

/* CONFIG_WIN32 end */
#elif defined (CONFIG_OS2)
/* OS/2 EMX */

#include <inttypes.h>

#ifndef int64_t_C
#define int64_t_C(c)	 (c ## LL)
#define uint64_t_C(c)	(c ## ULL)
#endif

#ifdef HAVE_AV_CONFIG_H

#ifdef USE_FASTMEMCPY
#include "fastmemcpy.h"
#endif

#include <float.h>

#endif /* HAVE_AV_CONFIG_H */

/* CONFIG_OS2 end */
#else

/* unix */

#include <inttypes.h>

#ifndef int64_t_C
#define int64_t_C(c)	 (c ## LL)
#define uint64_t_C(c)	(c ## ULL)
#endif

#ifdef HAVE_AV_CONFIG_H

#		ifdef USE_FASTMEMCPY
#			include "fastmemcpy.h"
#		endif
#	endif /* HAVE_AV_CONFIG_H */

#endif /* !CONFIG_WIN32 && !CONFIG_OS2 */

#ifdef HAVE_AV_CONFIG_H

#	include "bswap.h"

#	if defined(__MINGW32__) || defined(__CYGWIN__) || \
		defined(__OS2__) || (defined (__OpenBSD__) && !defined(__ELF__))
#		define MANGLE(a) "_" #a
#	else
#		define MANGLE(a) #a
#	endif

/* debug stuff */

#	ifndef DEBUG
#		define NDEBUG
#	endif
#	include <assert.h>

/* dprintf macros */
#	if defined(CONFIG_WIN32) && !defined(__MINGW32__)

inline void dprintf(const char* fmt,...) {}

#	else

#		ifdef DEBUG
#			define dprintf(fmt,args...) printf(fmt, ## args)
#		else
#			define dprintf(fmt,args...)
#		endif

#	endif /* !CONFIG_WIN32 */

#	define av_abort()	  do { fprintf(stderr, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)

//rounded divison & shift
#define RSHIFT(a,b) ((a) > 0 ? ((a) + (1<<((b)-1)))>>(b) : ((a) + (1<<((b)-1))-1)>>(b))
/* assume b>0 */
#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
#define ABS(a) ((a) >= 0 ? (a) : (-(a)))

#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))

extern const uint32_t inverse[256];

#ifdef ARCH_X86
#	define FASTDIV(a,b) \
	({\
		int ret,dmy;\
		asm volatile(\
			"mull %3"\
			:"=d"(ret),"=a"(dmy)\
			:"1"(a),"g"(inverse[b])\
			);\
		ret;\
	})
#elif defined(CONFIG_FASTDIV)
#	define FASTDIV(a,b)   ((uint32_t)((((uint64_t)a)*inverse[b])>>32))
#else
#	define FASTDIV(a,b)   ((a)/(b))
#endif
 
#ifdef ARCH_X86
// avoid +32 for shift optimization (gcc should do that ...)
static inline  int32_t NEG_SSR32( int32_t a, int8_t s){
	asm ("sarl %1, %0\n\t"
		 : "+r" (a)
		 : "ic" ((uint8_t)(-s))
	);
	return a;
}
static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
	asm ("shrl %1, %0\n\t"
		 : "+r" (a)
		 : "ic" ((uint8_t)(-s))
	);
	return a;
}
#else
#	define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
#	define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
#endif

/* bit output */

struct PutBitContext;

typedef void (*WriteDataFunc)(void *, uint8_t *, int);

typedef struct PutBitContext {
#ifdef ALT_BITSTREAM_WRITER
	uint8_t *buf, *buf_end;
	int index;
#else
	uint32_t bit_buf;
	int bit_left;
	uint8_t *buf, *buf_ptr, *buf_end;
#endif
	int64_t data_out_size; /* in bytes */
} PutBitContext;

void init_put_bits(PutBitContext *s, 
				   uint8_t *buffer, int buffer_size,
				   void *opaque,
				   void (*write_data)(void *, uint8_t *, int));

int64_t get_bit_count(PutBitContext *s); /* XXX: change function name */
void align_put_bits(PutBitContext *s);
void flush_put_bits(PutBitContext *s);
void put_string(PutBitContext * pbc, char *s);

/* bit input */

typedef struct GetBitContext {
	const uint8_t *buffer, *buffer_end;
#ifdef ALT_BITSTREAM_READER
	int index;
#elif defined LIBMPEG2_BITSTREAM_READER
	uint8_t *buffer_ptr;
	uint32_t cache;
	int bit_count;
#elif defined A32_BITSTREAM_READER
	uint32_t *buffer_ptr;
	uint32_t cache0;
	uint32_t cache1;
	int bit_count;
#endif
	int size_in_bits;
} GetBitContext;

static inline int get_bits_count(GetBitContext *s);

#define VLC_TYPE int16_t

typedef struct VLC {
	int bits;
	VLC_TYPE (*table)[2]; ///< code, bits
	int table_size, table_allocated;
} VLC;

typedef struct RL_VLC_ELEM {
	int16_t level;
	int8_t len;
	uint8_t run;
} RL_VLC_ELEM;

#ifdef ARCH_SPARC64
#define UNALIGNED_STORES_ARE_BAD
#endif

/* used to avoid missaligned exceptions on some archs (alpha, ...) */
#ifdef ARCH_X86
#	define unaligned32(a) (*(uint32_t*)(a))
#else
#	ifdef __GNUC__
static inline uint32_t unaligned32(const void *v) {
	struct Unaligned {
	uint32_t i;
	} __attribute__((packed));

	return ((const struct Unaligned *) v)->i;
}
#	elif defined(__DECC)
static inline uint32_t unaligned32(const void *v) {
	return *(const __unaligned uint32_t *) v;
}
#	else
static inline uint32_t unaligned32(const void *v) {
	return *(const uint32_t *) v;
}
#	endif
#endif //!ARCH_X86

#ifndef ALT_BITSTREAM_WRITER
static inline void put_bits(PutBitContext *s, int n, unsigned int value)
{
	unsigned int bit_buf;
	int bit_left;

#ifdef STATS
	st_out_bit_counts[st_current_index] += n;
#endif
	//	DEBUG_LOG("put_bits=%d %x\n", n, value);
	assert(n == 32 || value < (1U << n));
	
	bit_buf = s->bit_buf;
	bit_left = s->bit_left;

	//	DEBUG_LOG("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
	/* XXX: optimize */
	if (n < bit_left) {
		bit_buf = (bit_buf<<n) | value;
		bit_left-=n;
	} else {
	bit_buf<<=bit_left;
		bit_buf |= value >> (n - bit_left);
#ifdef UNALIGNED_STORES_ARE_BAD
		if (3 & (int) s->buf_ptr) {
			s->buf_ptr[0] = bit_buf >> 24;
			s->buf_ptr[1] = bit_buf >> 16;
			s->buf_ptr[2] = bit_buf >>  8;
			s->buf_ptr[3] = bit_buf	  ;
		} else
#endif
		*(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
		//DEBUG_LOG("bitbuf = %08x\n", bit_buf);
		s->buf_ptr+=4;
	bit_left+=32 - n;
		bit_buf = value;
	}

	s->bit_buf = bit_buf;
	s->bit_left = bit_left;
}
#endif


#ifdef ALT_BITSTREAM_WRITER
static inline void put_bits(PutBitContext *s, int n, unsigned int value)
{
#	ifdef ALIGNED_BITSTREAM_WRITER
#		ifdef ARCH_X86
	asm volatile(
	"movl %0, %%ecx			\n\t"
	"xorl %%eax, %%eax		\n\t"
	"shrdl %%cl, %1, %%eax		\n\t"
	"shrl %%cl, %1			\n\t"
	"movl %0, %%ecx			\n\t"
	"shrl $3, %%ecx			\n\t"
	"andl $0xFFFFFFFC, %%ecx	\n\t"
	"bswapl %1			\n\t"
	"orl %1, (%2, %%ecx)		\n\t"
	"bswapl %%eax			\n\t"
	"addl %3, %0			\n\t"
	"movl %%eax, 4(%2, %%ecx)	\n\t"
	: "=&r" (s->index), "=&r" (value)
	: "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
	: "%eax", "%ecx"
	);
#		else
	int index= s->index;
	uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
	
	value<<= 32-n; 
	
	ptr[0] |= be2me_32(value>>(index&31));
	ptr[1]  = be2me_32(value<<(32-(index&31)));
//if(n>24) DEBUG_LOG("%d %d\n", n, value);
	index+= n;
	s->index= index;
#		endif
#	else //ALIGNED_BITSTREAM_WRITER
#		ifdef ARCH_X86
	asm volatile(
	"movl $7, %%ecx			\n\t"
	"andl %0, %%ecx			\n\t"
	"addl %3, %%ecx			\n\t"
	"negl %%ecx			\n\t"
	"shll %%cl, %1			\n\t"
	"bswapl %1			\n\t"
	"movl %0, %%ecx			\n\t"
	"shrl $3, %%ecx			\n\t"
	"orl %1, (%%ecx, %2)		\n\t"
	"addl %3, %0			\n\t"
	"movl $0, 4(%%ecx, %2)		\n\t"
	: "=&r" (s->index), "=&r" (value)
	: "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
	: "%ecx"
	);
#		else
	int index= s->index;
	uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
	
	ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
	ptr[1] = 0;
//if(n>24) DEBUG_LOG("%d %d\n", n, value);
	index+= n;
	s->index= index;
#		endif
#	endif //!ALIGNED_BITSTREAM_WRITER
}
#endif


static inline uint8_t* pbBufPtr(PutBitContext *s)
{
#ifdef ALT_BITSTREAM_WRITER
	return s->buf + (s->index>>3);
#else
	return s->buf_ptr;
#endif
}

/* Bitstream reader API docs:
name
	abritary name which is used as prefix for the internal variables

gb
	getbitcontext

OPEN_READER(name, gb)
	loads gb into local variables

CLOSE_READER(name, gb)
	stores local vars in gb

UPDATE_CACHE(name, gb)
	refills the internal cache from the bitstream
	after this call at least MIN_CACHE_BITS will be available,

GET_CACHE(name, gb)
	will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit)

SHOW_UBITS(name, gb, num)
	will return the nest num bits

SHOW_SBITS(name, gb, num)
	will return the nest num bits and do sign extension

SKIP_BITS(name, gb, num)
	will skip over the next num bits
	note, this is equinvalent to SKIP_CACHE; SKIP_COUNTER

SKIP_CACHE(name, gb, num)
	will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER)

SKIP_COUNTER(name, gb, num)
	will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)

LAST_SKIP_CACHE(name, gb, num)
	will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing

LAST_SKIP_BITS(name, gb, num)
	is equinvalent to SKIP_LAST_CACHE; SKIP_COUNTER

for examples see get_bits, show_bits, skip_bits, get_vlc
*/

static inline int unaligned32_be(const void *v)
{
#ifdef CONFIG_ALIGN
	const uint8_t *p=v;
	return (((p[0]<<8) | p[1])<<16) | (p[2]<<8) | (p[3]);
#else
	return be2me_32( unaligned32(v)); //original
#endif
}

#ifdef ALT_BITSTREAM_READER
#   define MIN_CACHE_BITS 25

#   define OPEN_READER(name, gb)\
		int name##_index= (gb)->index;\
		int name##_cache= 0;\

#   define CLOSE_READER(name, gb)\
		(gb)->index= name##_index;\

#   define UPDATE_CACHE(name, gb)\
		name##_cache= unaligned32_be( ((uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\

#   define SKIP_CACHE(name, gb, num)\
		name##_cache <<= (num);\

// FIXME name?
#   define SKIP_COUNTER(name, gb, num)\
		name##_index += (num);\

#   define SKIP_BITS(name, gb, num)\
		{\
			SKIP_CACHE(name, gb, num)\
			SKIP_COUNTER(name, gb, num)\
		}\

#   define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
#   define LAST_SKIP_CACHE(name, gb, num) ;

#   define SHOW_UBITS(name, gb, num)\
		NEG_USR32(name##_cache, num)

#   define SHOW_SBITS(name, gb, num)\
		NEG_SSR32(name##_cache, num)

#   define GET_CACHE(name, gb)\
		((uint32_t)name##_cache)

static inline int get_bits_count(GetBitContext *s){
	return s->index;
}
#elif defined LIBMPEG2_BITSTREAM_READER
//libmpeg2 like reader

#   define MIN_CACHE_BITS 17

#   define OPEN_READER(name, gb)\
		int name##_bit_count=(gb)->bit_count;\
		int name##_cache= (gb)->cache;\
		uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\

#   define CLOSE_READER(name, gb)\
		(gb)->bit_count= name##_bit_count;\
		(gb)->cache= name##_cache;\
		(gb)->buffer_ptr= name##_buffer_ptr;\

#ifdef LIBMPEG2_BITSTREAM_READER_HACK

#   define UPDATE_CACHE(name, gb)\
	if(name##_bit_count >= 0){\
		name##_cache+= (int)be2me_16(*(uint16_t*)name##_buffer_ptr) << name##_bit_count;\
		((uint16_t*)name##_buffer_ptr)++;\
		name##_bit_count-= 16;\
	}\

#else

#   define UPDATE_CACHE(name, gb)\
	if(name##_bit_count >= 0){\
		name##_cache+= ((name##_buffer_ptr[0]<<8) + name##_buffer_ptr[1]) << name##_bit_count;\
		name##_buffer_ptr+=2;\
		name##_bit_count-= 16;\
	}\

#endif

#   define SKIP_CACHE(name, gb, num)\
		name##_cache <<= (num);\

#   define SKIP_COUNTER(name, gb, num)\
		name##_bit_count += (num);\

#   define SKIP_BITS(name, gb, num)\
		{\
			SKIP_CACHE(name, gb, num)\
			SKIP_COUNTER(name, gb, num)\
		}\

#   define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
#   define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)

#   define SHOW_UBITS(name, gb, num)\
		NEG_USR32(name##_cache, num)

#   define SHOW_SBITS(name, gb, num)\
		NEG_SSR32(name##_cache, num)

#   define GET_CACHE(name, gb)\
		((uint32_t)name##_cache)

static inline int get_bits_count(GetBitContext *s){
	return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
}

#elif defined A32_BITSTREAM_READER

#   define MIN_CACHE_BITS 32

#   define OPEN_READER(name, gb)\
		int name##_bit_count=(gb)->bit_count;\
		uint32_t name##_cache0= (gb)->cache0;\
		uint32_t name##_cache1= (gb)->cache1;\
		uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\

#   define CLOSE_READER(name, gb)\
		(gb)->bit_count= name##_bit_count;\
		(gb)->cache0= name##_cache0;\
		(gb)->cache1= name##_cache1;\
		(gb)->buffer_ptr= name##_buffer_ptr;\

#   define UPDATE_CACHE(name, gb)\
	if(name##_bit_count > 0){\
		const uint32_t next= be2me_32( *name##_buffer_ptr );\
		name##_cache0 |= NEG_USR32(next,name##_bit_count);\
		name##_cache1 |= next<<name##_bit_count;\
		name##_buffer_ptr++;\
		name##_bit_count-= 32;\
	}\

#ifdef ARCH_X86
#   define SKIP_CACHE(name, gb, num)\
		asm(\
			"shldl %2, %1, %0		\n\t"\
			"shll %2, %1		\n\t"\
			: "+r" (name##_cache0), "+r" (name##_cache1)\
			: "Ic" ((uint8_t)num)\
		   );
#else
#   define SKIP_CACHE(name, gb, num)\
		name##_cache0 <<= (num);\
		name##_cache0 |= NEG_USR32(name##_cache1,num);\
		name##_cache1 <<= (num);
#endif

#   define SKIP_COUNTER(name, gb, num)\
		name##_bit_count += (num);\

#   define SKIP_BITS(name, gb, num)\
		{\
			SKIP_CACHE(name, gb, num)\
			SKIP_COUNTER(name, gb, num)\
		}\

#   define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num)
#   define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num)

#   define SHOW_UBITS(name, gb, num)\
		NEG_USR32(name##_cache0, num)

#   define SHOW_SBITS(name, gb, num)\
		NEG_SSR32(name##_cache0, num)

#   define GET_CACHE(name, gb)\
		(name##_cache0)

static inline int get_bits_count(GetBitContext *s){
	return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
}

#endif

/**
 * read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
 * if MSB not set it is negative 
 * @param n length in bits
 * @author BERO  
 */
static inline int get_xbits(GetBitContext *s, int n){
	register int tmp;
	register int32_t cache;
	OPEN_READER(re, s)
	UPDATE_CACHE(re, s)
	cache = GET_CACHE(re,s);
	if ((int32_t)cache<0) { //MSB=1
		tmp = NEG_USR32(cache,n);
	} else {
	//   tmp = (-1<<n) | NEG_USR32(cache,n) + 1; mpeg12.c algo
	//   tmp = - (NEG_USR32(cache,n) ^ ((1 << n) - 1)); h263.c algo
		tmp = - NEG_USR32(~cache,n);
	}
	LAST_SKIP_BITS(re, s, n)
	CLOSE_READER(re, s)
	return tmp;
}

static inline int get_sbits(GetBitContext *s, int n){
	register int tmp;
	OPEN_READER(re, s)
	UPDATE_CACHE(re, s)
	tmp= SHOW_SBITS(re, s, n);
	LAST_SKIP_BITS(re, s, n)
	CLOSE_READER(re, s)
	return tmp;
}

/**
 * reads 0-17 bits.
 * Note, the alt bitstream reader can read upto 25 bits, but the libmpeg2 reader cant
 */
static inline unsigned int get_bits(GetBitContext *s, int n){
	register int tmp;
	OPEN_READER(re, s)
	UPDATE_CACHE(re, s)
	tmp= SHOW_UBITS(re, s, n);
	LAST_SKIP_BITS(re, s, n)
	CLOSE_READER(re, s)
	return tmp;
}

unsigned int get_bits_long(GetBitContext *s, int n);

/**
 * shows 0-17 bits.
 * Note, the alt bitstream reader can read upto 25 bits, but the libmpeg2 reader cant
 */
static inline unsigned int show_bits(GetBitContext *s, int n){
	register int tmp;
	OPEN_READER(re, s)
	UPDATE_CACHE(re, s)
	tmp= SHOW_UBITS(re, s, n);
//	CLOSE_READER(re, s)
	return tmp;
}

unsigned int show_bits_long(GetBitContext *s, int n);

static inline void skip_bits(GetBitContext *s, int n){
 //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
	OPEN_READER(re, s)
	UPDATE_CACHE(re, s)
	LAST_SKIP_BITS(re, s, n)
	CLOSE_READER(re, s)
}

static inline unsigned int get_bits1(GetBitContext *s){
#ifdef ALT_BITSTREAM_READER
	int index= s->index;
	uint8_t result= s->buffer[ index>>3 ];
	result<<= (index&0x07);
	result>>= 8 - 1;
	index++;
	s->index= index;

	return result;
#else
	return get_bits(s, 1);
#endif
}

static inline unsigned int show_bits1(GetBitContext *s){
	return show_bits(s, 1);
}

static inline void skip_bits1(GetBitContext *s){
	skip_bits(s, 1);
}

void init_get_bits(GetBitContext *s,
				   const uint8_t *buffer, int buffer_size);

int check_marker(GetBitContext *s, const char *msg);
void align_get_bits(GetBitContext *s);
int init_vlc(VLC *vlc, int nb_bits, int nb_codes,
			 const void *bits, int bits_wrap, int bits_size,
			 const void *codes, int codes_wrap, int codes_size);
void free_vlc(VLC *vlc);

/**
 *
 * if the vlc code is invalid and max_depth=1 than no bits will be removed
 * if the vlc code is invalid and max_depth>1 than the number of bits removed
 * is undefined
 */
#define GET_VLC(code, name, gb, table, bits, max_depth)\
{\
	int n, index, nb_bits;\
\
	index= SHOW_UBITS(name, gb, bits);\
	code = table[index][0];\
	n	= table[index][1];\
\
	if(max_depth > 1 && n < 0){\
		LAST_SKIP_BITS(name, gb, bits)\
		UPDATE_CACHE(name, gb)\
\
		nb_bits = -n;\
\
		index= SHOW_UBITS(name, gb, nb_bits) + code;\
		code = table[index][0];\
		n	= table[index][1];\
		if(max_depth > 2 && n < 0){\
			LAST_SKIP_BITS(name, gb, nb_bits)\
			UPDATE_CACHE(name, gb)\
\
			nb_bits = -n;\
\
			index= SHOW_UBITS(name, gb, nb_bits) + code;\
			code = table[index][0];\
			n	= table[index][1];\
		}\
	}\
	SKIP_BITS(name, gb, n)\
}

#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth)\
{\
	int n, index, nb_bits;\
\
	index= SHOW_UBITS(name, gb, bits);\
	level = table[index].level;\
	n	 = table[index].len;\
\
	if(max_depth > 1 && n < 0){\
		LAST_SKIP_BITS(name, gb, bits)\
		UPDATE_CACHE(name, gb)\
\
		nb_bits = -n;\
\
		index= SHOW_UBITS(name, gb, nb_bits) + level;\
		level = table[index].level;\
		n	 = table[index].len;\
	}\
	run= table[index].run;\
	SKIP_BITS(name, gb, n)\
}

// deprecated, dont use get_vlc for new code, use get_vlc2 instead or use GET_VLC directly
static inline int get_vlc(GetBitContext *s, VLC *vlc)
{
	int code;
	VLC_TYPE (*table)[2]= vlc->table;
	
	OPEN_READER(re, s)
	UPDATE_CACHE(re, s)

	GET_VLC(code, re, s, table, vlc->bits, 3)	

	CLOSE_READER(re, s)
	return code;
}

/**
 * parses a vlc code, faster then get_vlc()
 * @param bits is the number of bits which will be read at once, must be 
 *			 identical to nb_bits in init_vlc()
 * @param max_depth is the number of times bits bits must be readed to completly
 *				  read the longest vlc code 
 *				  = (max_vlc_length + bits - 1) / bits
 */
static always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
								  int bits, int max_depth)
{
	int code;
	
	OPEN_READER(re, s)
	UPDATE_CACHE(re, s)

	GET_VLC(code, re, s, table, bits, max_depth)

	CLOSE_READER(re, s)
	return code;
}

//#define TRACE

#ifdef TRACE

static inline void print_bin(int bits, int n){
	int i;
	
	for(i=n-1; i>=0; i--){
		DEBUG_LOG("%d", (bits>>i)&1);
	}
	for(i=n; i<24; i++)
		DEBUG_LOG(" ");
}

static inline int get_bits_trace(GetBitContext *s, int n, char *file, char *func, int line){
	int r= get_bits(s, n);
	
	print_bin(r, n);
	DEBUG_LOG("%5d %2d %3d bit @%5d in %s %s:%d\n", r, n, r, get_bits_count(s)-n, file, func, line);
	return r;
}
static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, char *func, int line){
	int show= show_bits(s, 24);
	int pos= get_bits_count(s);
	int r= get_vlc2(s, table, bits, max_depth);
	int len= get_bits_count(s) - pos;
	int bits2= show>>(24-len);
	
	print_bin(bits2, len);
	
	DEBUG_LOG("%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line);
	return r;
}
static inline int get_xbits_trace(GetBitContext *s, int n, char *file, char *func, int line){
	int show= show_bits(s, n);
	int r= get_xbits(s, n);
	
	print_bin(show, n);
	DEBUG_LOG("%5d %2d %3d xbt @%5d in %s %s:%d\n", show, n, r, get_bits_count(s)-n, file, func, line);
	return r;
}

#define get_bits(s, n)  get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
#define get_bits1(s)	get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
#define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
#define get_vlc(s, vlc)			get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
#define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)

#define tprintf printf

#else //TRACE
#define tprintf(_arg...) {}
#endif

/* define it to include statistics code (useful only for optimizing
   codec efficiency */
//#define STATS

#ifdef STATS

enum {
	ST_UNKNOWN,
	ST_DC,
	ST_INTRA_AC,
	ST_INTER_AC,
	ST_INTRA_MB,
	ST_INTER_MB,
	ST_MV,
	ST_NB,
};

extern int st_current_index;
extern unsigned int st_bit_counts[ST_NB];
extern unsigned int st_out_bit_counts[ST_NB];

void print_stats(void);
#endif

/* misc math functions */
extern const uint8_t ff_log2_tab[256];

static inline int av_log2(unsigned int v)
{
	int n;

	n = 0;
	if (v & 0xffff0000) {
		v >>= 16;
		n += 16;
	}
	if (v & 0xff00) {
		v >>= 8;
		n += 8;
	}
	n += ff_log2_tab[v];

	return n;
}

static inline int av_log2_16bit(unsigned int v)
{
	int n;

	n = 0;
	if (v & 0xff00) {
		v >>= 8;
		n += 8;
	}
	n += ff_log2_tab[v];

	return n;
}


/* median of 3 */
static inline int mid_pred(int a, int b, int c)
{
	int vmin, vmax;
	vmax = vmin = a;
	if (b < vmin)
		vmin = b;
	else
	vmax = b;

	if (c < vmin)
		vmin = c;
	else if (c > vmax)
		vmax = c;

	return a + b + c - vmin - vmax;
}

static inline int clip(int a, int amin, int amax)
{
	if (a < amin)
		return amin;
	else if (a > amax)
		return amax;
	else
		return a;
}

/* math */
extern const uint8_t ff_sqrt_tab[128];

int64_t ff_gcd(int64_t a, int64_t b);

static inline int ff_sqrt(int a)
{
	int ret=0;
	int s;
	int ret_sq=0;
	
	if(a<128) return ff_sqrt_tab[a];
	
	for(s=15; s>=0; s--){
		int b= ret_sq + (1<<(s*2)) + (ret<<s)*2;
		if(b<=a){
			ret_sq=b;
			ret+= 1<<s;
		}
	}
	return ret;
}

/**
 * converts fourcc string to int
 */
static inline int ff_get_fourcc(const char *s){
	assert( strlen(s)==4 );

	return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
}

#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))


void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max);


#ifdef ARCH_X86
#define MASK_ABS(mask, level)\
			asm volatile(\
		"cdq			\n\t"\
		"xorl %1, %0		\n\t"\
		"subl %1, %0		\n\t"\
		: "+a" (level), "=&d" (mask)\
		);
#else
#define MASK_ABS(mask, level)\
			mask= level>>31;\
			level= (level^mask)-mask;
#endif


#if __CPU__ >= 686 && !defined(RUNTIME_CPUDETECT)
#define COPY3_IF_LT(x,y,a,b,c,d)\
asm volatile (\
	"cmpl %0, %3	\n\t"\
	"cmovl %3, %0	\n\t"\
	"cmovl %4, %1	\n\t"\
	"cmovl %5, %2	\n\t"\
	: "+r" (x), "+r" (a), "+r" (c)\
	: "r" (y), "r" (b), "r" (d)\
);
#else
#define COPY3_IF_LT(x,y,a,b,c,d)\
if((y)<(x)){\
	 (x)=(y);\
	 (a)=(b);\
	 (c)=(d);\
}
#endif

#ifdef ARCH_X86
static inline long long rdtsc()
{
	long long l;
	asm volatile(	"rdtsc\n\t"
		: "=A" (l)
	);
	return l;
}

#define START_TIMER \
static uint64_t tsum=0;\
static int tcount=0;\
static int tskip_count=0;\
uint64_t tend;\
uint64_t tstart= rdtsc();\

#define STOP_TIMER(id) \
tend= rdtsc();\
if(tcount<2 || tend - tstart < 4*tsum/tcount){\
	tsum+= tend - tstart;\
	tcount++;\
}else\
	tskip_count++;\
if(256*256*256*64%(tcount+tskip_count)==0){\
	fprintf(stderr, "%Ld dezicycles in %s, %d runs, %d skips\n", tsum*10/tcount, id, tcount, tskip_count);\
}
#endif

#define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d)

/* avoid usage of various functions */
#define malloc please_use_av_malloc
#define free please_use_av_free
#define realloc please_use_av_realloc

#define CHECKED_ALLOCZ(p, size)\
{\
	p= av_mallocz(size);\
	if(p==NULL && (size)!=0){\
		perror("malloc");\
		goto fail;\
	}\
}

#endif /* HAVE_AV_CONFIG_H */

#endif /* COMMON_H */
