905 lines
20 KiB
C
905 lines
20 KiB
C
#ifndef COMMON_H
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#define COMMON_H
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#define FFMPEG_VERSION_INT 0x000406
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#define FFMPEG_VERSION "0.4.6"
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#if defined(WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
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#define CONFIG_WIN32
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#endif
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//#define ALT_BITSTREAM_WRITER
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//#define ALIGNED_BITSTREAM_WRITER
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//#define ALT_BITSTREAM_READER
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//#define ALIGNED_BITSTREAM
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#define FAST_GET_FIRST_VLC
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//#define DUMP_STREAM // only works with the ALT_BITSTREAM_READER
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#ifdef HAVE_AV_CONFIG_H
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/* only include the following when compiling package */
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <math.h>
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#ifndef ENODATA
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#define ENODATA 61
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#endif
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#endif /* HAVE_AV_CONFIG_H */
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#ifdef CONFIG_WIN32
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/* windows */
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typedef unsigned short UINT16;
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typedef signed short INT16;
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typedef unsigned char UINT8;
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typedef unsigned int UINT32;
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typedef unsigned __int64 UINT64;
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typedef signed char INT8;
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typedef signed int INT32;
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typedef signed __int64 INT64;
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typedef UINT8 uint8_t;
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typedef INT8 int8_t;
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typedef UINT16 uint16_t;
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typedef INT16 int16_t;
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typedef UINT32 uint32_t;
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typedef INT32 int32_t;
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#ifndef __MINGW32__
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#define INT64_C(c) (c ## i64)
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#define UINT64_C(c) (c ## i64)
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#define inline __inline
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#else
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#define INT64_C(c) (c ## LL)
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#define UINT64_C(c) (c ## ULL)
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#endif /* __MINGW32__ */
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#define M_PI 3.14159265358979323846
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#define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
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#ifdef _DEBUG
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#define DEBUG
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#endif
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// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
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#define bswap_32(x) \
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((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
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(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
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#define be2me_32(x) bswap_32(x)
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#define snprintf _snprintf
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#ifndef __MINGW32__
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/* no config.h with VC */
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#define CONFIG_ENCODERS 1
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#define CONFIG_DECODERS 1
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#define CONFIG_AC3 1
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#endif
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#else
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/* unix */
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#include <inttypes.h>
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#ifndef __WINE_WINDEF16_H
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/* workaround for typedef conflict in MPlayer (wine typedefs) */
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typedef unsigned short UINT16;
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typedef signed short INT16;
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#endif
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typedef unsigned char UINT8;
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typedef unsigned int UINT32;
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typedef unsigned long long UINT64;
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typedef signed char INT8;
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typedef signed int INT32;
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typedef signed long long INT64;
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#ifdef HAVE_AV_CONFIG_H
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#ifdef __FreeBSD__
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#include <sys/param.h>
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#endif
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#ifndef INT64_C
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#define INT64_C(c) (c ## LL)
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#define UINT64_C(c) (c ## ULL)
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#endif
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#include "bswap.h"
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#ifdef USE_FASTMEMCPY
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#include "fastmemcpy.h"
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#endif
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#endif /* HAVE_AV_CONFIG_H */
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#endif /* !CONFIG_WIN32 */
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/* debug stuff */
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#ifdef HAVE_AV_CONFIG_H
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#ifndef DEBUG
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#define NDEBUG
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#endif
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#include <assert.h>
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/* dprintf macros */
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#if defined(CONFIG_WIN32) && !defined(__MINGW32__)
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inline void dprintf(const char* fmt,...) {}
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#else
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#ifdef DEBUG
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#define dprintf(fmt,args...) printf(fmt, ## args)
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#else
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#define dprintf(fmt,args...)
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#endif
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#endif /* !CONFIG_WIN32 */
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#endif /* HAVE_AV_CONFIG_H */
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/* assume b>0 */
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#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
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#define ABS(a) ((a) >= 0 ? (a) : (-(a)))
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/* bit output */
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struct PutBitContext;
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typedef void (*WriteDataFunc)(void *, UINT8 *, int);
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typedef struct PutBitContext {
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#ifdef ALT_BITSTREAM_WRITER
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UINT8 *buf, *buf_end;
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int index;
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#else
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UINT32 bit_buf;
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int bit_left;
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UINT8 *buf, *buf_ptr, *buf_end;
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#endif
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INT64 data_out_size; /* in bytes */
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} PutBitContext;
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void init_put_bits(PutBitContext *s,
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UINT8 *buffer, int buffer_size,
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void *opaque,
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void (*write_data)(void *, UINT8 *, int));
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INT64 get_bit_count(PutBitContext *s); /* XXX: change function name */
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void align_put_bits(PutBitContext *s);
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void flush_put_bits(PutBitContext *s);
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void put_string(PutBitContext * pbc, char *s);
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/* jpeg specific put_bits */
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void jflush_put_bits(PutBitContext *s);
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/* bit input */
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typedef struct GetBitContext {
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#ifdef ALT_BITSTREAM_READER
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int index;
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UINT8 *buffer;
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#else
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UINT32 bit_buf;
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int bit_cnt;
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UINT8 *buf, *buf_ptr, *buf_end;
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#endif
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int size;
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} GetBitContext;
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static inline int get_bits_count(GetBitContext *s);
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typedef struct VLC {
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int bits;
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INT16 *table_codes;
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INT8 *table_bits;
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int table_size, table_allocated;
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} VLC;
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/* used to avoid missaligned exceptions on some archs (alpha, ...) */
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#ifdef ARCH_X86
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#define unaligned32(a) (*(UINT32*)(a))
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#else
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#ifdef __GNUC__
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static inline uint32_t unaligned32(const void *v) {
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struct Unaligned {
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uint32_t i;
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} __attribute__((packed));
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return ((const struct Unaligned *) v)->i;
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}
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#elif defined(__DECC)
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static inline uint32_t unaligned32(const void *v) {
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return *(const __unaligned uint32_t *) v;
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}
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#else
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static inline uint32_t unaligned32(const void *v) {
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return *(const uint32_t *) v;
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}
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#endif
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#endif //!ARCH_X86
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#ifndef ALT_BITSTREAM_WRITER
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static inline void put_bits(PutBitContext *s, int n, unsigned int value)
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{
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unsigned int bit_buf;
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int bit_left;
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#ifdef STATS
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st_out_bit_counts[st_current_index] += n;
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#endif
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// printf("put_bits=%d %x\n", n, value);
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assert(n == 32 || value < (1U << n));
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bit_buf = s->bit_buf;
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bit_left = s->bit_left;
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// printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
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/* XXX: optimize */
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if (n < bit_left) {
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bit_buf = (bit_buf<<n) | value;
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bit_left-=n;
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} else {
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bit_buf<<=bit_left;
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bit_buf |= value >> (n - bit_left);
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*(UINT32 *)s->buf_ptr = be2me_32(bit_buf);
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//printf("bitbuf = %08x\n", bit_buf);
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s->buf_ptr+=4;
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bit_left+=32 - n;
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bit_buf = value;
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}
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s->bit_buf = bit_buf;
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s->bit_left = bit_left;
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}
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#endif
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#ifdef ALT_BITSTREAM_WRITER
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static inline void put_bits(PutBitContext *s, int n, unsigned int value)
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{
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#ifdef ALIGNED_BITSTREAM_WRITER
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#ifdef ARCH_X86
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asm volatile(
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"movl %0, %%ecx \n\t"
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"xorl %%eax, %%eax \n\t"
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"shrdl %%cl, %1, %%eax \n\t"
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"shrl %%cl, %1 \n\t"
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"movl %0, %%ecx \n\t"
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"shrl $3, %%ecx \n\t"
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"andl $0xFFFFFFFC, %%ecx \n\t"
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"bswapl %1 \n\t"
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"orl %1, (%2, %%ecx) \n\t"
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"bswapl %%eax \n\t"
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"addl %3, %0 \n\t"
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"movl %%eax, 4(%2, %%ecx) \n\t"
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: "=&r" (s->index), "=&r" (value)
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: "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
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: "%eax", "%ecx"
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);
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#else
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int index= s->index;
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uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
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value<<= 32-n;
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ptr[0] |= be2me_32(value>>(index&31));
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ptr[1] = be2me_32(value<<(32-(index&31)));
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//if(n>24) printf("%d %d\n", n, value);
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index+= n;
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s->index= index;
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#endif
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#else //ALIGNED_BITSTREAM_WRITER
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#ifdef ARCH_X86
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asm volatile(
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"movl $7, %%ecx \n\t"
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"andl %0, %%ecx \n\t"
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"addl %3, %%ecx \n\t"
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"negl %%ecx \n\t"
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"shll %%cl, %1 \n\t"
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"bswapl %1 \n\t"
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"movl %0, %%ecx \n\t"
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"shrl $3, %%ecx \n\t"
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"orl %1, (%%ecx, %2) \n\t"
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"addl %3, %0 \n\t"
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"movl $0, 4(%%ecx, %2) \n\t"
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: "=&r" (s->index), "=&r" (value)
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: "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
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: "%ecx"
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);
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#else
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int index= s->index;
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uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
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ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
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ptr[1] = 0;
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//if(n>24) printf("%d %d\n", n, value);
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index+= n;
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s->index= index;
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#endif
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#endif //!ALIGNED_BITSTREAM_WRITER
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}
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#endif
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#ifndef ALT_BITSTREAM_WRITER
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/* for jpeg : escape 0xff with 0x00 after it */
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static inline void jput_bits(PutBitContext *s, int n, unsigned int value)
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{
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unsigned int bit_buf, b;
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int bit_left, i;
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assert(n == 32 || value < (1U << n));
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bit_buf = s->bit_buf;
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bit_left = s->bit_left;
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//printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
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/* XXX: optimize */
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if (n < bit_left) {
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bit_buf = (bit_buf<<n) | value;
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bit_left-=n;
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} else {
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bit_buf<<=bit_left;
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bit_buf |= value >> (n - bit_left);
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/* handle escape */
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for(i=0;i<4;i++) {
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b = (bit_buf >> 24);
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*(s->buf_ptr++) = b;
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if (b == 0xff)
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*(s->buf_ptr++) = 0;
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bit_buf <<= 8;
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}
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bit_left+= 32 - n;
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bit_buf = value;
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}
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s->bit_buf = bit_buf;
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s->bit_left = bit_left;
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}
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#endif
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#ifdef ALT_BITSTREAM_WRITER
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static inline void jput_bits(PutBitContext *s, int n, int value)
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{
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int index= s->index;
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uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
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int v= ptr[0];
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//if(n>24) printf("%d %d\n", n, value);
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v |= be2me_32(value<<(32-n-(index&7) ));
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if(((v+0x01010101)^0xFFFFFFFF)&v&0x80808080)
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{
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/* handle idiotic (m)jpeg escapes */
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uint8_t *bPtr= (uint8_t*)ptr;
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int numChecked= ((index+n)>>3) - (index>>3);
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v= be2me_32(v);
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*(bPtr++)= v>>24;
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if((v&0xFF000000)==0xFF000000 && numChecked>0){
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*(bPtr++)= 0x00;
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index+=8;
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}
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*(bPtr++)= (v>>16)&0xFF;
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if((v&0x00FF0000)==0x00FF0000 && numChecked>1){
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*(bPtr++)= 0x00;
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index+=8;
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}
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*(bPtr++)= (v>>8)&0xFF;
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if((v&0x0000FF00)==0x0000FF00 && numChecked>2){
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*(bPtr++)= 0x00;
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index+=8;
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}
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*(bPtr++)= v&0xFF;
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if((v&0x000000FF)==0x000000FF && numChecked>3){
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*(bPtr++)= 0x00;
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index+=8;
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}
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*((uint32_t*)bPtr)= 0;
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}
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else
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{
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ptr[0] = v;
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ptr[1] = 0;
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}
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index+= n;
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s->index= index;
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}
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#endif
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static inline uint8_t* pbBufPtr(PutBitContext *s)
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{
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#ifdef ALT_BITSTREAM_WRITER
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return s->buf + (s->index>>3);
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#else
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return s->buf_ptr;
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#endif
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}
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void init_get_bits(GetBitContext *s,
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UINT8 *buffer, int buffer_size);
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#ifndef ALT_BITSTREAM_READER
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unsigned int get_bits_long(GetBitContext *s, int n);
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unsigned int show_bits_long(GetBitContext *s, int n);
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#endif
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static inline unsigned int get_bits(GetBitContext *s, int n){
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#ifdef ALT_BITSTREAM_READER
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#ifdef ALIGNED_BITSTREAM
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int index= s->index;
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uint32_t result1= be2me_32( ((uint32_t *)s->buffer)[index>>5] );
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uint32_t result2= be2me_32( ((uint32_t *)s->buffer)[(index>>5) + 1] );
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#ifdef ARCH_X86
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asm ("shldl %%cl, %2, %0\n\t"
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: "=r" (result1)
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: "0" (result1), "r" (result2), "c" (index));
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#else
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result1<<= (index&0x1F);
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result2= (result2>>1) >> (31-(index&0x1F));
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result1|= result2;
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#endif
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result1>>= 32 - n;
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index+= n;
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s->index= index;
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return result1;
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#else //ALIGNED_BITSTREAM
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int index= s->index;
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uint32_t result= be2me_32( unaligned32( ((uint8_t *)s->buffer)+(index>>3) ) );
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result<<= (index&0x07);
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result>>= 32 - n;
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index+= n;
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s->index= index;
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#ifdef DUMP_STREAM
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while(n){
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printf("%d", (result>>(n-1))&1);
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n--;
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}
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printf(" ");
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#endif
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return result;
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#endif //!ALIGNED_BITSTREAM
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#else //ALT_BITSTREAM_READER
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if(s->bit_cnt>=n){
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/* most common case here */
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unsigned int val = s->bit_buf >> (32 - n);
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s->bit_buf <<= n;
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s->bit_cnt -= n;
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#ifdef STATS
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st_bit_counts[st_current_index] += n;
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#endif
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return val;
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}
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return get_bits_long(s,n);
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#endif //!ALT_BITSTREAM_READER
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}
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static inline unsigned int get_bits1(GetBitContext *s){
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#ifdef ALT_BITSTREAM_READER
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int index= s->index;
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uint8_t result= s->buffer[ index>>3 ];
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result<<= (index&0x07);
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result>>= 8 - 1;
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index++;
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s->index= index;
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#ifdef DUMP_STREAM
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printf("%d ", result);
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#endif
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return result;
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#else
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if(s->bit_cnt>0){
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/* most common case here */
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unsigned int val = s->bit_buf >> 31;
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s->bit_buf <<= 1;
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s->bit_cnt--;
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#ifdef STATS
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st_bit_counts[st_current_index]++;
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#endif
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return val;
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}
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return get_bits_long(s,1);
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#endif
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}
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/* This function is identical to get_bits(), the only */
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/* diference is that it doesn't touch the buffer */
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/* it is usefull to see the buffer. */
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static inline unsigned int show_bits(GetBitContext *s, int n)
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{
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#ifdef ALT_BITSTREAM_READER
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#ifdef ALIGNED_BITSTREAM
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int index= s->index;
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uint32_t result1= be2me_32( ((uint32_t *)s->buffer)[index>>5] );
|
|
uint32_t result2= be2me_32( ((uint32_t *)s->buffer)[(index>>5) + 1] );
|
|
#ifdef ARCH_X86
|
|
asm ("shldl %%cl, %2, %0\n\t"
|
|
: "=r" (result1)
|
|
: "0" (result1), "r" (result2), "c" (index));
|
|
#else
|
|
result1<<= (index&0x1F);
|
|
result2= (result2>>1) >> (31-(index&0x1F));
|
|
result1|= result2;
|
|
#endif
|
|
result1>>= 32 - n;
|
|
|
|
return result1;
|
|
#else //ALIGNED_BITSTREAM
|
|
int index= s->index;
|
|
uint32_t result= be2me_32( unaligned32( ((uint8_t *)s->buffer)+(index>>3) ) );
|
|
|
|
result<<= (index&0x07);
|
|
result>>= 32 - n;
|
|
|
|
return result;
|
|
#endif //!ALIGNED_BITSTREAM
|
|
#else //ALT_BITSTREAM_READER
|
|
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);
|
|
#endif //!ALT_BITSTREAM_READER
|
|
}
|
|
|
|
static inline int show_aligned_bits(GetBitContext *s, int offset, int n)
|
|
{
|
|
#ifdef ALT_BITSTREAM_READER
|
|
#ifdef ALIGNED_BITSTREAM
|
|
int index= (s->index + offset + 7)&(~7);
|
|
uint32_t result1= be2me_32( ((uint32_t *)s->buffer)[index>>5] );
|
|
uint32_t result2= be2me_32( ((uint32_t *)s->buffer)[(index>>5) + 1] );
|
|
#ifdef ARCH_X86
|
|
asm ("shldl %%cl, %2, %0\n\t"
|
|
: "=r" (result1)
|
|
: "0" (result1), "r" (result2), "c" (index));
|
|
#else
|
|
result1<<= (index&0x1F);
|
|
result2= (result2>>1) >> (31-(index&0x1F));
|
|
result1|= result2;
|
|
#endif
|
|
result1>>= 32 - n;
|
|
|
|
return result1;
|
|
#else //ALIGNED_BITSTREAM
|
|
int index= (s->index + offset + 7)>>3;
|
|
uint32_t result= be2me_32( unaligned32( ((uint8_t *)s->buffer)+index ) );
|
|
|
|
result>>= 32 - n;
|
|
|
|
return result;
|
|
#endif //!ALIGNED_BITSTREAM
|
|
#else //ALT_BITSTREAM_READER
|
|
int index= (get_bits_count(s) + offset + 7)>>3;
|
|
uint32_t result= be2me_32( unaligned32( ((uint8_t *)s->buf)+index ) );
|
|
|
|
result>>= 32 - n;
|
|
//printf(" %X %X %d \n", (int)(((uint8_t *)s->buf)+index ), (int)s->buf_ptr, s->bit_cnt);
|
|
return result;
|
|
#endif //!ALT_BITSTREAM_READER
|
|
}
|
|
|
|
static inline void skip_bits(GetBitContext *s, int n){
|
|
#ifdef ALT_BITSTREAM_READER
|
|
s->index+= n;
|
|
#ifdef DUMP_STREAM
|
|
{
|
|
int result;
|
|
s->index-= n;
|
|
result= get_bits(s, n);
|
|
}
|
|
#endif
|
|
|
|
#else
|
|
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);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static inline void skip_bits1(GetBitContext *s){
|
|
#ifdef ALT_BITSTREAM_READER
|
|
s->index++;
|
|
#ifdef DUMP_STREAM
|
|
s->index--;
|
|
printf("%d ", get_bits1(s));
|
|
#endif
|
|
#else
|
|
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);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static inline int get_bits_count(GetBitContext *s)
|
|
{
|
|
#ifdef ALT_BITSTREAM_READER
|
|
return s->index;
|
|
#else
|
|
return (s->buf_ptr - s->buf) * 8 - s->bit_cnt;
|
|
#endif
|
|
}
|
|
|
|
int check_marker(GetBitContext *s, 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);
|
|
|
|
#ifdef ALT_BITSTREAM_READER
|
|
#ifdef ALIGNED_BITSTREAM
|
|
#ifdef ARCH_X86
|
|
#define SHOW_BITS(s, val, n) \
|
|
val= be2me_32( ((uint32_t *)(s)->buffer)[bit_cnt>>5] );\
|
|
{uint32_t result2= be2me_32( ((uint32_t *)(s)->buffer)[(bit_cnt>>5) + 1] );\
|
|
asm ("shldl %%cl, %2, %0\n\t"\
|
|
: "=r" (val)\
|
|
: "0" (val), "r" (result2), "c" (bit_cnt));\
|
|
((uint32_t)val)>>= 32 - n;}
|
|
#else //ARCH_X86
|
|
#define SHOW_BITS(s, val, n) \
|
|
val= be2me_32( ((uint32_t *)(s)->buffer)[bit_cnt>>5] );\
|
|
{uint32_t result2= be2me_32( ((uint32_t *)(s)->buffer)[(bit_cnt>>5) + 1] );\
|
|
val<<= (bit_cnt&0x1F);\
|
|
result2= (result2>>1) >> (31-(bit_cnt&0x1F));\
|
|
val|= result2;\
|
|
((uint32_t)val)>>= 32 - n;}
|
|
#endif //!ARCH_X86
|
|
#else //ALIGNED_BITSTREAM
|
|
#define SHOW_BITS(s, val, n) \
|
|
val= be2me_32( unaligned32( ((uint8_t *)(s)->buffer)+(bit_cnt>>3) ) );\
|
|
val<<= (bit_cnt&0x07);\
|
|
((uint32_t)val)>>= 32 - n;
|
|
#endif // !ALIGNED_BITSTREAM
|
|
#define FLUSH_BITS(n) bit_cnt+=n;
|
|
#define SAVE_BITS(s) bit_cnt= (s)->index;
|
|
#define RESTORE_BITS(s) (s)->index= bit_cnt;
|
|
#else
|
|
|
|
/* 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;\
|
|
}
|
|
#endif // !ALT_BITSTREAM_READER
|
|
|
|
static inline int get_vlc(GetBitContext *s, VLC *vlc)
|
|
{
|
|
int code, n, nb_bits, index;
|
|
INT16 *table_codes;
|
|
INT8 *table_bits;
|
|
int bit_cnt;
|
|
#ifndef ALT_BITSTREAM_READER
|
|
UINT32 bit_buf;
|
|
UINT8 *buf_ptr;
|
|
#endif
|
|
|
|
SAVE_BITS(s);
|
|
nb_bits = vlc->bits;
|
|
table_codes = vlc->table_codes;
|
|
table_bits = vlc->table_bits;
|
|
|
|
#ifdef FAST_GET_FIRST_VLC
|
|
SHOW_BITS(s, index, nb_bits);
|
|
code = table_codes[index];
|
|
n = table_bits[index];
|
|
if (n > 0) {
|
|
/* most common case (90%)*/
|
|
FLUSH_BITS(n);
|
|
#ifdef DUMP_STREAM
|
|
{
|
|
int n= bit_cnt - s->index;
|
|
skip_bits(s, n);
|
|
RESTORE_BITS(s);
|
|
}
|
|
#endif
|
|
RESTORE_BITS(s);
|
|
return code;
|
|
} else if (n == 0) {
|
|
return -1;
|
|
} else {
|
|
FLUSH_BITS(nb_bits);
|
|
nb_bits = -n;
|
|
table_codes = vlc->table_codes + code;
|
|
table_bits = vlc->table_bits + code;
|
|
}
|
|
#endif
|
|
for(;;) {
|
|
SHOW_BITS(s, index, nb_bits);
|
|
code = table_codes[index];
|
|
n = table_bits[index];
|
|
if (n > 0) {
|
|
/* most common case */
|
|
FLUSH_BITS(n);
|
|
#ifdef STATS
|
|
st_bit_counts[st_current_index] += n;
|
|
#endif
|
|
break;
|
|
} else if (n == 0) {
|
|
return -1;
|
|
} else {
|
|
FLUSH_BITS(nb_bits);
|
|
#ifdef STATS
|
|
st_bit_counts[st_current_index] += nb_bits;
|
|
#endif
|
|
nb_bits = -n;
|
|
table_codes = vlc->table_codes + code;
|
|
table_bits = vlc->table_bits + code;
|
|
}
|
|
}
|
|
#ifdef DUMP_STREAM
|
|
{
|
|
int n= bit_cnt - s->index;
|
|
skip_bits(s, n);
|
|
RESTORE_BITS(s);
|
|
}
|
|
#endif
|
|
RESTORE_BITS(s);
|
|
return code;
|
|
}
|
|
|
|
|
|
/* 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 */
|
|
|
|
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;
|
|
}
|
|
if (v & 0xf0) {
|
|
v >>= 4;
|
|
n += 4;
|
|
}
|
|
if (v & 0xc) {
|
|
v >>= 2;
|
|
n += 2;
|
|
}
|
|
if (v & 0x2) {
|
|
n++;
|
|
}
|
|
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;
|
|
}
|
|
|
|
/* memory */
|
|
void *av_malloc(int size);
|
|
void *av_mallocz(int size);
|
|
void av_free(void *ptr);
|
|
void __av_freep(void **ptr);
|
|
#define av_freep(p) __av_freep((void **)(p))
|
|
|
|
/* math */
|
|
int ff_gcd(int a, int b);
|
|
|
|
#define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d)
|
|
|
|
#endif
|