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Code Issues Releases Activity

avcodec/huffyuvencdsp: Fix load of misaligned values

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Affected many ffvhuff FATE tests.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-03-29 03:49:56 +01:00
parent 3ed23dab98
commit 8ecd383122
1 changed files with 24 additions and 8 deletions
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32
libavcodec/huffyuvencdsp.c
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@ -18,16 +18,32 @@
#include "config.h" #include "config.h"
#include "libavutil/attributes.h" #include "libavutil/attributes.h"
#include "libavutil/intreadwrite.h"
#include "huffyuvencdsp.h" #include "huffyuvencdsp.h"
#include "mathops.h" #include "mathops.h"
#if HAVE_FAST_64BIT
#define BITS 64
typedef uint64_t uint_native;
#else
#define BITS 32
typedef uint32_t uint_native;
#endif
#define RN AV_JOIN(AV_RN, BITS)
#define RNA AV_JOIN(AV_JOIN(AV_RN, BITS), A)
#define WNA AV_JOIN(AV_JOIN(AV_WN, BITS), A)
// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
#define pb_7f (~(uint_native)0 / 255 * 0x7f)
#define pb_80 (~(uint_native)0 / 255 * 0x80)
// 0x00010001 or 0x0001000100010001 or whatever, depending on the cpu's native arithmetic size // 0x00010001 or 0x0001000100010001 or whatever, depending on the cpu's native arithmetic size
#define pw_1 (ULONG_MAX / UINT16_MAX) #define pw_1 ((uint_native)-1 / UINT16_MAX)
static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w){ static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w){
long i; long i;
#if !HAVE_FAST_UNALIGNED #if !HAVE_FAST_UNALIGNED
if((long)src2 & (sizeof(long)-1)){ if ((uintptr_t)src2 & (sizeof(uint_native) - 1)) {
for(i=0; i+3<w; i+=4){ for(i=0; i+3<w; i+=4){
dst[i+0] = (src1[i+0]-src2[i+0]) & mask; dst[i+0] = (src1[i+0]-src2[i+0]) & mask;
dst[i+1] = (src1[i+1]-src2[i+1]) & mask; dst[i+1] = (src1[i+1]-src2[i+1]) & mask;
@ -37,13 +53,13 @@ static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *sr
}else }else
#endif #endif
{ {
unsigned long pw_lsb = (mask >> 1) * pw_1; uint_native pw_lsb = (mask >> 1) * pw_1;
unsigned long pw_msb = pw_lsb + pw_1; uint_native pw_msb = pw_lsb + pw_1;
for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) { for (i = 0; i <= w - (int)sizeof(uint_native)/2; i += sizeof(uint_native)/2) {
long a = *(long*)(src1+i); uint_native a = RNA(src1 + i);
long b = *(long*)(src2+i); uint_native b = RN (src2 + i);
*(long*)(dst+i) = ((a|pw_msb) - (b&pw_lsb)) ^ ((a^b^pw_msb)&pw_msb); WNA(dst + i, ((a | pw_msb) - (b & pw_lsb)) ^ ((a^b^pw_msb) & pw_msb));
} }
} }
for (; i<w; i++) for (; i<w; i++)