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Code Issues Releases Activity

avcodec/intrax8: Stop setting write-only block_last_index

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These values are only used by the mpegvideo unquantize functions,
yet these are not active when intrax is in use. Furthermore,
given that ff_intrax8_decode_picture() decodes multiple
macroblocks in a given call, it makes no sense to return
any value (that was in practice the maximum of the indices
of all the macroblocks decoded).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-03-07 02:16:10 +01:00
parent 1a564c1aff
commit 461b86fe7d
4 changed files with 2 additions and 19 deletions
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12
libavcodec/intrax8.c
View File

@ -480,24 +480,18 @@ static void x8_ac_compensation(IntraX8Context *const w, const int direction,
t = T(1084); // g
B(1, 1) += t;
w->block_last_index[0] = FFMAX(w->block_last_index[0], 7 * 8);
break;
case 1:
B(0, 1) -= T(6269);
B(0, 3) -= T(708);
B(0, 5) -= T(172);
B(0, 7) -= T(73);
w->block_last_index[0] = FFMAX(w->block_last_index[0], 7 * 8);
break;
case 2:
B(1, 0) -= T(6269);
B(3, 0) -= T(708);
B(5, 0) -= T(172);
B(7, 0) -= T(73);
w->block_last_index[0] = FFMAX(w->block_last_index[0], 7);
break;
}
#undef B
@ -599,10 +593,7 @@ static int x8_decode_intra_mb(IntraX8Context *const w, const int chroma)
w->block[0][scantable[pos]] = level;
} while (!final);
w->block_last_index[0] = pos;
} else { // DC only
w->block_last_index[0] = 0;
if (w->flat_dc && ((unsigned) (dc_level + 1)) < 3) { // [-1; 1]
int32_t divide_quant = !chroma ? w->divide_quant_dc_luma
: w->divide_quant_dc_chroma;
@ -633,7 +624,6 @@ static int x8_decode_intra_mb(IntraX8Context *const w, const int chroma)
* -> 01'10' 10'10' 00'00' 00'01' 01'11' 11'00 => 0x6A017C */
direction = (0x6A017C >> (w->orient * 2)) & 3;
if (direction != 3) {
// modify block_last[]
x8_ac_compensation(w, direction, w->block[0][0]);
}
}
@ -689,7 +679,6 @@ static void x8_init_block_index(IntraX8Context *w, AVFrame *frame)
av_cold int ff_intrax8_common_init(AVCodecContext *avctx,
IntraX8Context *w,
int16_t (*block)[64],
int block_last_index[12],
int mb_width, int mb_height)
{
static AVOnce init_static_once = AV_ONCE_INIT;
@ -698,7 +687,6 @@ av_cold int ff_intrax8_common_init(AVCodecContext *avctx,
w->mb_width = mb_width;
w->mb_height = mb_height;
w->block = block;
w->block_last_index = block_last_index;
// two rows, 2 blocks per cannon mb
w->prediction_table = av_mallocz(w->mb_width * 2 * 2);

3
libavcodec/intrax8.h
View File

@ -38,7 +38,6 @@ typedef struct IntraX8Context {
WMV2DSPContext wdsp;
uint8_t idct_permutation[64];
AVCodecContext *avctx;
int *block_last_index; ///< last nonzero coefficient in block
int16_t (*block)[64];
// set by the caller codec
@ -77,7 +76,6 @@ typedef struct IntraX8Context {
* @param avctx pointer to AVCodecContext
* @param w pointer to IntraX8Context
* @param block pointer to block array
* @param block_last_index pointer to index array
* @param mb_width macroblock width
* @param mb_height macroblock height
* @return 0 on success, a negative AVERROR value on error
@ -85,7 +83,6 @@ typedef struct IntraX8Context {
int ff_intrax8_common_init(AVCodecContext *avctx,
IntraX8Context *w,
int16_t (*block)[64],
int block_last_index[12],
int mb_width, int mb_height);
/**

3
libavcodec/vc1dec.c
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@ -422,8 +422,7 @@ static av_cold int vc1_decode_init_alloc_tables(VC1Context *v)
return AVERROR(ENOMEM);
}
ret = ff_intrax8_common_init(s->avctx, &v->x8,
s->block, s->block_last_index,
ret = ff_intrax8_common_init(s->avctx, &v->x8, s->block,
s->mb_width, s->mb_height);
if (ret < 0)
return ret;

3
libavcodec/wmv2dec.c
View File

@ -575,8 +575,7 @@ static av_cold int wmv2_decode_init(AVCodecContext *avctx)
decode_ext_header(w);
return ff_intrax8_common_init(avctx, &w->x8,
w->s.block, w->s.block_last_index,
return ff_intrax8_common_init(avctx, &w->x8, w->s.block,
w->s.mb_width, w->s.mb_height);
}