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2nd try of skip_bits_long() for the ALT reader

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1st try for the LIBMPEG2 reader
simplify init_get_bits()

Originally committed as revision 6097 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-08-26 11:50:23 +00:00
parent a42ec9f484
commit 6e4703cac7
1 changed files with 14 additions and 20 deletions
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34
libavcodec/bitstream.h
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@ -446,7 +446,7 @@ static inline int get_bits_count(GetBitContext *s){
}
static inline void skip_bits_long(GetBitContext *s, int n){
s->index + n;
s->index += n;
}
#elif defined LIBMPEG2_BITSTREAM_READER
@ -512,6 +512,16 @@ static inline int get_bits_count(GetBitContext *s){
return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count;
}
static inline void skip_bits_long(GetBitContext *s, int n){
OPEN_READER(re, s)
re_bit_count += n;
re_buffer_ptr += 2*(re_bit_count>>4);
re_bit_count &= 15;
re_cache = ((re_buffer_ptr[-2]<<8) + re_buffer_ptr[-1]) << (16+re_bit_count);
UPDATE_CACHE(re, s)
CLOSE_READER(re, s)
}
#elif defined A32_BITSTREAM_READER
# define MIN_CACHE_BITS 32
@ -706,25 +716,9 @@ static inline void init_get_bits(GetBitContext *s,
#ifdef ALT_BITSTREAM_READER
s->index=0;
#elif defined LIBMPEG2_BITSTREAM_READER
#ifdef LIBMPEG2_BITSTREAM_READER_HACK
if ((int)buffer&1) {
/* word alignment */
s->cache = (*buffer++)<<24;
s->buffer_ptr = buffer;
s->bit_count = 16-8;
} else
#endif
{
s->buffer_ptr = buffer;
s->bit_count = 16;
s->cache = 0;
}
{
OPEN_READER(re, s)
UPDATE_CACHE(re, s)
UPDATE_CACHE(re, s)
CLOSE_READER(re, s)
}
s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));
s->bit_count = 16 + 8*((intptr_t)buffer&1);
skip_bits_long(s, 0);
#elif defined A32_BITSTREAM_READER
s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3));
s->bit_count = 32 + 8*((intptr_t)buffer&3);