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move some functions to bitstream.h to avoid conflicts

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between different  bitstream readers in different codecs

Originally committed as revision 6117 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2006-08-28 18:44:49 +00:00
parent 1b4f17fafa
commit 8fbc6aae75
2 changed files with 35 additions and 40 deletions
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35
libavcodec/bitstream.c
View File

@ -47,41 +47,6 @@ void ff_put_string(PutBitContext * pbc, char *s, int put_zero)
put_bits(pbc, 8, 0); put_bits(pbc, 8, 0);
} }
/* bit input functions */
/**
* reads 0-32 bits.
*/
unsigned int get_bits_long(GetBitContext *s, int n){
if(n<=17) return get_bits(s, n);
else{
int ret= get_bits(s, 16) << (n-16);
return ret | get_bits(s, n-16);
}
}
/**
* shows 0-32 bits.
*/
unsigned int show_bits_long(GetBitContext *s, int n){
if(n<=17) return show_bits(s, n);
else{
GetBitContext gb= *s;
int ret= get_bits_long(s, n);
*s= gb;
return ret;
}
}
int check_marker(GetBitContext *s, const char *msg)
{
int bit= get_bits1(s);
if(!bit)
av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg);
return bit;
}
/* VLC decoding */ /* VLC decoding */
//#define DEBUG_VLC //#define DEBUG_VLC

40
libavcodec/bitstream.h
View File

@ -6,6 +6,8 @@
#ifndef BITSTREAM_H #ifndef BITSTREAM_H
#define BITSTREAM_H #define BITSTREAM_H
#include "log.h"
//#define ALT_BITSTREAM_WRITER //#define ALT_BITSTREAM_WRITER
//#define ALIGNED_BITSTREAM_WRITER //#define ALIGNED_BITSTREAM_WRITER
#if !defined(LIBMPEG2_BITSTREAM_READER) && !defined(A32_BITSTREAM_READER) && !defined(ALT_BITSTREAM_READER) #if !defined(LIBMPEG2_BITSTREAM_READER) && !defined(A32_BITSTREAM_READER) && !defined(ALT_BITSTREAM_READER)
@ -642,8 +644,6 @@ static inline unsigned int get_bits(GetBitContext *s, int n){
return tmp; return tmp;
} }
unsigned int get_bits_long(GetBitContext *s, int n);
/** /**
* shows 0-17 bits. * shows 0-17 bits.
* Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
@ -657,8 +657,6 @@ static inline unsigned int show_bits(GetBitContext *s, int n){
return tmp; return tmp;
} }
unsigned int show_bits_long(GetBitContext *s, int n);
static inline void skip_bits(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 :)) //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
OPEN_READER(re, s) OPEN_READER(re, s)
@ -695,6 +693,39 @@ static inline void skip_bits1(GetBitContext *s){
skip_bits(s, 1); skip_bits(s, 1);
} }
/**
* reads 0-32 bits.
*/
static inline unsigned int get_bits_long(GetBitContext *s, int n){
if(n<=17) return get_bits(s, n);
else{
int ret= get_bits(s, 16) << (n-16);
return ret | get_bits(s, n-16);
}
}
/**
* shows 0-32 bits.
*/
static inline unsigned int show_bits_long(GetBitContext *s, int n){
if(n<=17) return show_bits(s, n);
else{
GetBitContext gb= *s;
int ret= get_bits_long(s, n);
*s= gb;
return ret;
}
}
static inline int check_marker(GetBitContext *s, const char *msg)
{
int bit= get_bits1(s);
if(!bit)
av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg);
return bit;
}
/** /**
* init GetBitContext. * init GetBitContext.
* @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits
@ -828,7 +859,6 @@ static always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2],
//#define TRACE //#define TRACE
#ifdef TRACE #ifdef TRACE
#include "avcodec.h"
static inline void print_bin(int bits, int n){ static inline void print_bin(int bits, int n){
int i; int i;