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avcodec/mjpegdec: Only keep what is used from ScanTable

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Namely ScanTable.permutated.

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 05:50:56 +02:00
parent 5975bb7f81
commit 3cdfb146b2
2 changed files with 9 additions and 9 deletions
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16
libavcodec/mjpegdec.c
View File

@ -115,8 +115,8 @@ static void init_idct(AVCodecContext *avctx)
MJpegDecodeContext *s = avctx->priv_data;
ff_idctdsp_init(&s->idsp, avctx);
ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
ff_zigzag_direct);
ff_permute_scantable(s->permutated_scantable, ff_zigzag_direct,
s->idsp.idct_permutation);
}
av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
@ -846,7 +846,7 @@ static int decode_block(MJpegDecodeContext *s, int16_t *block, int component,
av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
return AVERROR_INVALIDDATA;
}
j = s->scantable.permutated[i];
j = s->permutated_scantable[i];
block[j] = level * quant_matrix[i];
}
} while (i < 63);
@ -909,14 +909,14 @@ static int decode_block_progressive(MJpegDecodeContext *s, int16_t *block,
if (i >= se) {
if (i == se) {
j = s->scantable.permutated[se];
j = s->permutated_scantable[se];
block[j] = level * (quant_matrix[se] << Al);
break;
}
av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
return AVERROR_INVALIDDATA;
}
j = s->scantable.permutated[i];
j = s->permutated_scantable[i];
block[j] = level * (quant_matrix[i] << Al);
} else {
if (run == 0xF) {// ZRL - skip 15 coefficients
@ -964,7 +964,7 @@ for (; ; i++) { \
} \
break; \
} \
j = s->scantable.permutated[i]; \
j = s->permutated_scantable[i]; \
if (block[j]) \
REFINE_BIT(j) \
else if (run-- == 0) \
@ -994,7 +994,7 @@ static int decode_block_refinement(MJpegDecodeContext *s, int16_t *block,
val = SHOW_UBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
ZERO_RUN;
j = s->scantable.permutated[i];
j = s->permutated_scantable[i];
val--;
block[j] = ((quant_matrix[i] << Al) ^ val) - val;
if (i == se) {
@ -1026,7 +1026,7 @@ static int decode_block_refinement(MJpegDecodeContext *s, int16_t *block,
}
for (; i <= last; i++) {
j = s->scantable.permutated[i];
j = s->permutated_scantable[i];
if (block[j])
REFINE_BIT(j)
}

2
libavcodec/mjpegdec.h
View File

@ -118,7 +118,7 @@ typedef struct MJpegDecodeContext {
uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
int palette_index;
int force_pal8;
ScanTable scantable;
uint8_t permutated_scantable[64];
BlockDSPContext bdsp;
HpelDSPContext hdsp;
IDCTDSPContext idsp;