fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2025-12-24 13:10:10 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

vl/vlc: add function to limit the vlc size

Browse source 
Signed-off-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Christian König 2013-09-17 07:27:38 -06:00
parent 9ef42a54a7
commit b8b28bf94a
1 changed files with 41 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

53
src/gallium/auxiliary/vl/vl_vlc.h
View file

@ -45,7 +45,6 @@ struct vl_vlc
const uint8_t *data;
const uint8_t *end;
unsigned num_inputs;
const void *const *inputs;
const unsigned *sizes;
unsigned bytes_left;
@ -94,14 +93,18 @@ vl_vlc_next_input(struct vl_vlc *vlc)
unsigned len = vlc->sizes[0];
assert(vlc);
assert(vlc->num_inputs);
assert(vlc->bytes_left);
vlc->bytes_left -= len;
if (len < vlc->bytes_left)
vlc->bytes_left -= len;
else {
len = vlc->bytes_left;
vlc->bytes_left = 0;
}
vlc->data = vlc->inputs[0];
vlc->end = vlc->data + len;
--vlc->num_inputs;
++vlc->inputs;
++vlc->sizes;
}
@ -135,10 +138,11 @@ vl_vlc_fillbits(struct vl_vlc *vlc)
/* if this input is depleted */
if (bytes_left == 0) {
if (vlc->num_inputs)
if (vlc->bytes_left) {
/* go on to next input */
vl_vlc_next_input(vlc);
else
vl_vlc_align_data_ptr(vlc);
} else
/* or give up since we don't have anymore inputs */
return;
@ -182,7 +186,6 @@ vl_vlc_init(struct vl_vlc *vlc, unsigned num_inputs,
vlc->buffer = 0;
vlc->invalid_bits = 32;
vlc->num_inputs = num_inputs;
vlc->inputs = inputs;
vlc->sizes = sizes;
vlc->bytes_left = 0;
@ -190,10 +193,11 @@ vl_vlc_init(struct vl_vlc *vlc, unsigned num_inputs,
for (i = 0; i < num_inputs; ++i)
vlc->bytes_left += sizes[i];
vl_vlc_next_input(vlc);
vl_vlc_align_data_ptr(vlc);
vl_vlc_fillbits(vlc);
vl_vlc_fillbits(vlc);
if (vlc->bytes_left) {
vl_vlc_next_input(vlc);
vl_vlc_align_data_ptr(vlc);
vl_vlc_fillbits(vlc);
}
}
/**
@ -313,7 +317,7 @@ vl_vlc_search_byte(struct vl_vlc *vlc, unsigned num_bits, uint8_t value)
/* if this input is depleted */
if (vlc->data == vlc->end) {
if (vlc->num_inputs)
if (vlc->bytes_left)
/* go on to next input */
vl_vlc_next_input(vlc);
else
@ -350,4 +354,29 @@ vl_vlc_removebits(struct vl_vlc *vlc, unsigned pos, unsigned num_bits)
vlc->invalid_bits += num_bits;
}
/**
* limit the number of bits left for fetching
*/
static INLINE void
vl_vlc_limit(struct vl_vlc *vlc, unsigned bits_left)
{
assert(bits_left <= vl_vlc_bits_left(vlc));
vl_vlc_fillbits(vlc);
if (bits_left < vl_vlc_valid_bits(vlc)) {
vlc->invalid_bits = 32 - bits_left;
vlc->buffer &= ~0L << (vlc->invalid_bits + 32);
vlc->end = vlc->data;
vlc->bytes_left = 0;
} else {
assert((bits_left - vl_vlc_valid_bits(vlc)) % 8 == 0);
vlc->bytes_left = (bits_left - vl_vlc_valid_bits(vlc)) / 8;
if (vlc->bytes_left < (vlc->end - vlc->data)) {
vlc->end = vlc->data + vlc->bytes_left;
vlc->bytes_left = 0;
} else
vlc->bytes_left -= vlc->end - vlc->data;
}
}
#endif /* vl_vlc_h */