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vf_spp: only assign function pointers if permutation matches expectations.

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This commit is contained in:
Ronald S. Bultje 2017-06-23 11:01:38 -04:00
parent 565dc0e283
commit 97f7f83169
1 changed files with 7 additions and 1 deletions
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8
libavfilter/x86/vf_spp.c
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@ -21,6 +21,7 @@
#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavutil/crc.h"
#include "libavutil/mem.h"
#include "libavutil/x86/asm.h"
#include "libavfilter/vf_spp.h"
@ -223,10 +224,15 @@ av_cold void ff_spp_init_x86(SPPContext *s)
int cpu_flags = av_get_cpu_flags();
if (cpu_flags & AV_CPU_FLAG_MMX) {
static const uint32_t mmx_idct_perm_crc = 0xe5e8adc4;
uint32_t idct_perm_crc =
av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0,
s->dct->idct_permutation,
sizeof(s->dct->idct_permutation));
int64_t bps;
s->store_slice = store_slice_mmx;
av_opt_get_int(s->dct, "bits_per_sample", 0, &bps);
if (bps <= 8) {
if (bps <= 8 && idct_perm_crc == mmx_idct_perm_crc) {
switch (s->mode) {
case 0: s->requantize = hardthresh_mmx; break;
case 1: s->requantize = softthresh_mmx; break;