gstreamer/libs/getbits/gstgetbits_generic.c
Erik Walthinsen ae0d5d1889 Massive, massive update of most source files. I went through and cleaned up all the warnings that I could, which inv...
Original commit message from CVS:
Massive, massive update of most source files.  I went through and cleaned
up all the warnings that I could, which involved fixing some of the plugins.

The configure.in script was re-arranged and cleaned up so, and a check for
libtool 1.3.5 was added to autogen.sh.  Added checks for Gtk and GNOME.

Some plugins were removed from the list of things to build for various reasons.

Added GST_DEBUG_FORCE_DISABLE in gstgetbits, since that's time critical and
even an if() from a DEBUG can significantly increase runtimes.
2001-01-02 08:13:34 +00:00

116 lines
2.7 KiB
C

#include "gstgetbits.h"
unsigned long _gst_getbits_int_cb(gst_getbits_t *gb, unsigned long bits);
unsigned long _gst_get1bit_int(gst_getbits_t *gb, unsigned long bits);
unsigned long _gst_getbits_int(gst_getbits_t *gb, unsigned long bits);
unsigned long _gst_getbits_fast_int(gst_getbits_t *gb, unsigned long bits);
unsigned long _gst_showbits_int(gst_getbits_t *gb, unsigned long bits);
void _gst_flushbits_int(gst_getbits_t *gb, unsigned long bits);
void _gst_getbits_back_int(gst_getbits_t *gb, unsigned long bits);
unsigned long _gst_getbits_int_cb(gst_getbits_t *gb, unsigned long bits) {
int result;
int bitsleft;
//printf("gst_getbits%lu %ld %p %08x\n", bits, gb->bits, gb->ptr, gb->dword);
if (!bits) return 0;
gb->bits -= bits;
result = gb->dword >> (32-bits);
if (gb->bits < 0) {
gb->ptr += 4;
bitsleft = (gb->endptr - gb->ptr)*8;
bits = -gb->bits;
gb->bits += (bitsleft>32? 32 : bitsleft);
if (gb->endptr <= gb->ptr) {
(gb->callback)(gb, gb->data);
gb->bits -= bits;
}
gb->dword = swab32(*((unsigned long *)(gb->ptr)));
result |= (gb->dword >> (32-bits));
}
gb->dword <<= bits;
return result;
}
unsigned long _gst_get1bit_int(gst_getbits_t *gb, unsigned long bits) {
unsigned char rval;
rval = *gb->ptr << gb->bits;
gb->bits++;
gb->ptr += (gb->bits>>3);
gb->bits &= 0x7;
GST_DEBUG (0,"getbits%ld, %08x\n", bits, rval);
return rval>>7;
}
unsigned long _gst_getbits_int(gst_getbits_t *gb, unsigned long bits) {
unsigned long rval;
if (bits == 0) return 0;
rval = swab32(*((unsigned long *)(gb->ptr)));
rval <<= gb->bits;
gb->bits += bits;
rval >>= (32-bits);
gb->ptr += (gb->bits>>3);
gb->bits &= 0x7;
GST_DEBUG (0,"getbits%ld, %08lx\n", bits, rval);
return rval;
}
unsigned long _gst_getbits_fast_int(gst_getbits_t *gb, unsigned long bits) {
unsigned long rval;
rval = (unsigned char) (gb->ptr[0] << gb->bits);
rval |= ((unsigned int) gb->ptr[1] << gb->bits)>>8;
rval <<= bits;
rval >>= 8;
gb->bits += bits;
gb->ptr += (gb->bits>>3);
gb->bits &= 0x7;
GST_DEBUG (0,"getbits%ld, %08lx\n", bits, rval);
return rval;
}
unsigned long _gst_showbits_int(gst_getbits_t *gb, unsigned long bits) {
unsigned long rval;
if (bits == 0) return 0;
rval = swab32(*((unsigned long *)(gb->ptr)));
rval <<= gb->bits;
rval >>= (32-bits);
GST_DEBUG (0,"showbits%ld, %08lx\n", bits, rval);
return rval;
}
void _gst_flushbits_int(gst_getbits_t *gb, unsigned long bits) {
gb->bits += bits;
gb->ptr += (gb->bits>>3);
gb->bits &= 0x7;
GST_DEBUG (0,"flushbits%ld\n", bits);
}
void _gst_getbits_back_int(gst_getbits_t *gb, unsigned long bits) {
gb->bits -= bits;
gb->ptr += (gb->bits>>3);
gb->bits &= 0x7;
}