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ffmpeg/libavcodec/common.h
Juanjo 4949028f85 - Bug fix on inter MCBPC table for inter+q. 
- H.263/H.263+ decoder now knows GOB start codes.
- H.263/H.263+ decoder now returns the size of the stream on the first call.
- Added show_bits() functions to see the buffer without loosing the bits.
- TODO: H.263v1 UMV parsing is buggy.

Originally committed as revision 204 to svn://svn.ffmpeg.org/ffmpeg/trunk
2001-11-03 00:49:53 +00:00

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C
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#ifndef COMMON_H
#define COMMON_H
#define FFMPEG_VERSION_INT 0x000406
#define FFMPEG_VERSION "0.4.6"
#if defined(WIN32) && !defined(__MINGW32__)
#define CONFIG_WIN32
#endif
#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 <errno.h>
#ifndef ENODATA
#define ENODATA 61
#endif
#endif
#ifdef CONFIG_WIN32
/* windows */
typedef unsigned short UINT16;
typedef signed short INT16;
typedef unsigned char UINT8;
typedef unsigned int UINT32;
typedef unsigned __int64 UINT64;
typedef signed char INT8;
typedef signed int INT32;
typedef signed __int64 INT64;
typedef UINT8 uint8_t;
typedef INT8 int8_t;
typedef UINT16 uint16_t;
typedef INT16 int16_t;
typedef UINT32 uint32_t;
typedef INT32 int32_t;
#ifndef __MINGW32__
#define INT64_C(c) (c ## i64)
#define UINT64_C(c) (c ## i64)
#define inline __inline
/*
Disable warning messages:
warning C4244: '=' : conversion from 'double' to 'float', possible loss of data
warning C4305: 'argument' : truncation from 'const double' to 'float'
*/
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#else
#define INT64_C(c) (c ## LL)
#define UINT64_C(c) (c ## ULL)
#endif /* __MINGW32__ */
#define M_PI 3.14159265358979323846
#define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
#ifdef _DEBUG
#define DEBUG
#endif
// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
#define bswap_32(x) \
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#define be2me_32(x) bswap_32(x)
#define snprintf _snprintf
#ifndef __MINGW32__
/* no config.h with VC */
#define CONFIG_ENCODERS 1
#define CONFIG_DECODERS 1
#define CONFIG_AC3 1
#endif
#else
/* unix */
#include <inttypes.h>
#ifndef __WINE_WINDEF16_H
/* workaround for typedef conflict in MPlayer (wine typedefs) */
typedef unsigned short UINT16;
typedef signed short INT16;
#endif
typedef unsigned char UINT8;
typedef unsigned int UINT32;
typedef unsigned long long UINT64;
typedef signed char INT8;
typedef signed int INT32;
typedef signed long long INT64;
#ifdef HAVE_AV_CONFIG_H
#ifdef __FreeBSD__
#include <sys/param.h>
#endif
#ifndef INT64_C
#define INT64_C(c) (c ## LL)
#define UINT64_C(c) (c ## ULL)
#endif
#include "../bswap.h"
#ifdef USE_FASTMEMCPY
#include "fastmemcpy.h"
#endif
#endif /* HAVE_AV_CONFIG_H */
#endif /* !CONFIG_WIN32 */
/* debug stuff */
#ifdef HAVE_AV_CONFIG_H
#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 */
#endif /* HAVE_AV_CONFIG_H */
/* bit output */
struct PutBitContext;
typedef void (*WriteDataFunc)(void *, UINT8 *, int);
typedef struct PutBitContext {
UINT32 bit_buf;
int bit_cnt;
UINT8 *buf, *buf_ptr, *buf_end;
INT64 data_out_size; /* in bytes */
void *opaque;
WriteDataFunc write_data;
} PutBitContext;
void init_put_bits(PutBitContext *s,
UINT8 *buffer, int buffer_size,
void *opaque,
void (*write_data)(void *, UINT8 *, int));
void put_bits(PutBitContext *s, int n, unsigned int value);
INT64 get_bit_count(PutBitContext *s); /* XXX: change function name */
void align_put_bits(PutBitContext *s);
void flush_put_bits(PutBitContext *s);
/* jpeg specific put_bits */
void jput_bits(PutBitContext *s, int n, unsigned int value);
void jflush_put_bits(PutBitContext *s);
/* bit input */
typedef struct GetBitContext {
UINT32 bit_buf;
int bit_cnt;
UINT8 *buf, *buf_ptr, *buf_end;
} GetBitContext;
typedef struct VLC {
int bits;
INT16 *table_codes;
INT8 *table_bits;
int table_size, table_allocated;
} VLC;
void init_get_bits(GetBitContext *s,
UINT8 *buffer, int buffer_size);
unsigned int get_bits_long(GetBitContext *s, int n);
unsigned int show_bits_long(GetBitContext *s, int n);
static inline unsigned int get_bits(GetBitContext *s, int n){
if(s->bit_cnt>=n){
/* most common case here */
unsigned int val = s->bit_buf >> (32 - n);
s->bit_buf <<= n;
s->bit_cnt -= n;
#ifdef STATS
st_bit_counts[st_current_index] += n;
#endif
return val;
}
return get_bits_long(s,n);
}
static inline unsigned int get_bits1(GetBitContext *s){
if(s->bit_cnt>0){
/* most common case here */
unsigned int val = s->bit_buf >> 31;
s->bit_buf <<= 1;
s->bit_cnt--;
#ifdef STATS
st_bit_counts[st_current_index]++;
#endif
return val;
}
return get_bits_long(s,1);
}
/* This function is identical to get_bits(), the only */
/* diference is that it doesn't touch the buffer */
/* it is usefull to see the buffer. */
static inline unsigned int show_bits(GetBitContext *s, int n)
{
if(s->bit_cnt>=n) {
/* most common case here */
unsigned int val = s->bit_buf >> (32 - n);
return val;
}
return show_bits_long(s,n);
}
static inline void skip_bits(GetBitContext *s, int n){
if(s->bit_cnt>=n){
/* most common case here */
s->bit_buf <<= n;
s->bit_cnt -= n;
#ifdef STATS
st_bit_counts[st_current_index] += n;
#endif
} else {
get_bits_long(s,n);
}
}
static inline void skip_bits1(GetBitContext *s){
if(s->bit_cnt>0){
/* most common case here */
s->bit_buf <<= 1;
s->bit_cnt--;
#ifdef STATS
st_bit_counts[st_current_index]++;
#endif
} else {
get_bits_long(s,1);
}
}
static inline int get_bits_count(GetBitContext *s)
{
return (s->buf_ptr - s->buf) * 8 - s->bit_cnt;
}
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);
int get_vlc(GetBitContext *s, VLC *vlc);
/* macro to go faster */
/* n must be <= 24 */
/* XXX: optimize buffer end test */
#define SHOW_BITS(s, val, n)\
{\
if (bit_cnt < n && buf_ptr < (s)->buf_end) {\
bit_buf |= *buf_ptr++ << (24 - bit_cnt);\
bit_cnt += 8;\
if (bit_cnt < n && buf_ptr < (s)->buf_end) {\
bit_buf |= *buf_ptr++ << (24 - bit_cnt);\
bit_cnt += 8;\
if (bit_cnt < n && buf_ptr < (s)->buf_end) {\
bit_buf |= *buf_ptr++ << (24 - bit_cnt);\
bit_cnt += 8;\
}\
}\
}\
val = bit_buf >> (32 - n);\
}
/* SHOW_BITS with n1 >= n must be been done before */
#define FLUSH_BITS(n)\
{\
bit_buf <<= n;\
bit_cnt -= n;\
}
#define SAVE_BITS(s) \
{\
bit_cnt = (s)->bit_cnt;\
bit_buf = (s)->bit_buf;\
buf_ptr = (s)->buf_ptr;\
}
#define RESTORE_BITS(s) \
{\
(s)->buf_ptr = buf_ptr;\
(s)->bit_buf = bit_buf;\
(s)->bit_cnt = bit_cnt;\
}
/* 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 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;
}
if (v & 0xf0) {
v >>= 4;
n += 4;
}
if (v & 0xc) {
v >>= 2;
n += 2;
}
if (v & 0x2) {
n++;
}
return n;
}
/* memory */
void *av_mallocz(int size);
#endif
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