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avcodec/idctdsp: Add function to apply permutation to array

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It is the part of ff_init_scantable() that is used
by all users of said function.

Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-10-20 04:26:00 +02:00
parent 0d53d92e3a
commit ee0e03fe77
2 changed files with 11 additions and 0 deletions
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9
libavcodec/idctdsp.c
View File

@ -27,6 +27,15 @@
#include "simple_idct.h"
#include "xvididct.h"
av_cold void ff_permute_scantable(uint8_t dst[64], const uint8_t src[64],
const uint8_t permutation[64])
{
for (int i = 0; i < 64; i++) {
int j = src[i];
dst[i] = permutation[j];
}
}
av_cold void ff_init_scantable(const uint8_t *permutation, ScanTable *st,
const uint8_t *src_scantable)
{

2
libavcodec/idctdsp.h
View File

@ -43,6 +43,8 @@ enum idct_permutation_type {
FF_IDCT_PERM_SSE2,
};
void ff_permute_scantable(uint8_t dst[64], const uint8_t src[64],
const uint8_t permutation[64]);
void ff_init_scantable(const uint8_t *permutation, ScanTable *st,
const uint8_t *src_scantable);
void ff_init_scantable_permutation(uint8_t *idct_permutation,