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move align_get_bits() to .h to avoid conflicts between different bitstream readers in different codecs 

add a skip_bits_long() which can skip by any amount in any direction (several codecs contain half working hacks to do that)

Originally committed as revision 6093 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-08-26 10:26:14 +00:00
parent 727c236a6b
commit 5a7bd28335
2 changed files with 27 additions and 7 deletions
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6
libavcodec/bitstream.c
View File

@ -73,12 +73,6 @@ unsigned int show_bits_long(GetBitContext *s, int n){
}
}
void align_get_bits(GetBitContext *s)
{
int n= (-get_bits_count(s)) & 7;
if(n) skip_bits(s, n);
}
int check_marker(GetBitContext *s, const char *msg)
{
int bit= get_bits1(s);

28
libavcodec/bitstream.h
View File

@ -444,6 +444,11 @@ static inline int unaligned32_le(const void *v)
static inline int get_bits_count(GetBitContext *s){
return s->index;
}
static inline void skip_bits_long(GetBitContext *s, int n){
s->index + n;
}
#elif defined LIBMPEG2_BITSTREAM_READER
//libmpeg2 like reader
@ -572,6 +577,22 @@ static inline int get_bits_count(GetBitContext *s){
return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count;
}
static inline void skip_bits_long(GetBitContext *s, int n){
OPEN_READER(re, s)
re_bit_count += n;
re_buffer_ptr += s->bit_count>>5;
re_bit_count &= 31;
if(re_bit_count<=0){
re_bit_count += 32;
re_buffer_ptr--;
}
re_cache0=
re_cache1= 0;
UPDATE_CACHE(re, s)
re_cache1= 0;
CLOSE_READER(re, s)
}
#endif
/**
@ -720,8 +741,13 @@ static inline void init_get_bits(GetBitContext *s,
#endif
}
static void align_get_bits(GetBitContext *s)
{
int n= (-get_bits_count(s)) & 7;
if(n) skip_bits(s, n);
}
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,