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ffmpeg.wasm-core
Commit 62d94453 authored by Michael Niedermayer's avatar Michael Niedermayer
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vc1: simplify code use INIT_LUT() 

Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
parent 2e789d16
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Showing with 20 additions and 35 deletions
libavcodec/vc1.c
View file @ 62d94453
......@@ -576,6 +576,25 @@ int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContex
return 0;
}
/* fill lookup tables for intensity compensation */
#define INIT_LUT(lumscale, lumshift, luty, lutuv) \
if (!lumscale) { \
scale = -64; \
shift = (255 - lumshift * 2) << 6; \
if (lumshift > 31) \
shift += 128 << 6; \
} else { \
scale = lumscale + 32; \
if (lumshift > 31) \
shift = (lumshift - 64) << 6; \
else \
shift = lumshift << 6; \
} \
for (i = 0; i < 256; i++) { \
luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6); \
lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6); \
}
int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
{
int pqindex, lowquant, status;
......@@ -682,22 +701,7 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
v->lumshift = get_bits(gb, 6);
v->use_ic = 1;
/* fill lookup tables for intensity compensation */
if (!v->lumscale) {
scale = -64;
shift = (255 - v->lumshift * 2) << 6;
if (v->lumshift > 31)
shift += 128 << 6;
} else {
scale = v->lumscale + 32;
if (v->lumshift > 31)
shift = (v->lumshift - 64) << 6;
else
shift = v->lumshift << 6;
}
for (i = 0; i < 256; i++) {
v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);
v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);
}
INIT_LUT(v->lumscale, v->lumshift, v->luty, v->lutuv);
}
v->qs_last = v->s.quarter_sample;
if (v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)
......@@ -808,25 +812,6 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
return 0;
}
/* fill lookup tables for intensity compensation */
#define INIT_LUT(lumscale, lumshift, luty, lutuv) \
if (!lumscale) { \
scale = -64; \
shift = (255 - lumshift * 2) << 6; \
if (lumshift > 31) \
shift += 128 << 6; \
} else { \
scale = lumscale + 32; \
if (lumshift > 31) \
shift = (lumshift - 64) << 6; \
else \
shift = lumshift << 6; \
} \
for (i = 0; i < 256; i++) { \
luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6); \
lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6); \
}
int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
{
int pqindex, lowquant;
......
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