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Code Issues Releases Activity

dirac_vlc: add a SET_RESIDUE macro and fix recent regression

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Can also be used in future cleanups since 99% of the time the leftover
appending will just append to an already empty residue.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
This commit is contained in:
Rostislav Pehlivanov 2016-07-14 01:00:59 +01:00
parent 000eb01a7d
commit c4adcff976
1 changed files with 15 additions and 9 deletions
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24
libavcodec/dirac_vlc.c
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@ -27,9 +27,13 @@
#define CONVERT_TO_RESIDUE(a, b) \
(((residual)(a)) << (RSIZE_BITS - (b)))
#define INIT_RESIDUE(N, I, B) \
residual N = B ? CONVERT_TO_RESIDUE(I, B) : 0; \
av_unused int32_t N ## _bits = B
#define INIT_RESIDUE(N) \
residual N = 0; \
av_unused int32_t N ## _bits = 0
#define SET_RESIDUE(N, I, B) \
N = CONVERT_TO_RESIDUE(I, B); \
N ## _bits = B
#define APPEND_RESIDUE(N, M) \
N |= M >> (N ## _bits); \
@ -41,7 +45,7 @@ int ff_dirac_golomb_read_32bit(DiracGolombLUT *lut_ctx, const uint8_t *buf,
int i, b, c_idx = 0;
int32_t *dst = (int32_t *)_dst;
DiracGolombLUT *future[4], *l = &lut_ctx[2*LUT_SIZE + buf[0]];
INIT_RESIDUE(res, 0, 1);
INIT_RESIDUE(res);
for (b = 1; b <= bytes; b++) {
future[0] = &lut_ctx[buf[b]];
@ -61,7 +65,7 @@ int ff_dirac_golomb_read_32bit(DiracGolombLUT *lut_ctx, const uint8_t *buf,
coeff |= (res >> (RSIZE_BITS - 2*i - 2)) & 1;
}
dst[c_idx++] = l->sign * (coeff - 1);
res_bits = res = 0;
SET_RESIDUE(res, 0, 0);
}
memcpy(&dst[c_idx], l->ready, LUT_BITS*sizeof(int32_t));
@ -81,7 +85,7 @@ int ff_dirac_golomb_read_16bit(DiracGolombLUT *lut_ctx, const uint8_t *buf,
int i, b, c_idx = 0;
int16_t *dst = (int16_t *)_dst;
DiracGolombLUT *future[4], *l = &lut_ctx[2*LUT_SIZE + buf[0]];
INIT_RESIDUE(res, 0, 1);
INIT_RESIDUE(res);
for (b = 1; b <= bytes; b++) {
future[0] = &lut_ctx[buf[b]];
@ -100,7 +104,7 @@ int ff_dirac_golomb_read_16bit(DiracGolombLUT *lut_ctx, const uint8_t *buf,
coeff |= (res >> (RSIZE_BITS - 2*i - 2)) & 1;
}
dst[c_idx++] = l->sign * (coeff - 1);
res_bits = res = 0;
SET_RESIDUE(res, 0, 0);
}
for (i = 0; i < LUT_BITS; i++)
@ -170,7 +174,8 @@ static void generate_parity_lut(DiracGolombLUT *lut, int even)
uint32_t code;
int i;
INIT_RESIDUE(res, idx, LUT_BITS);
INIT_RESIDUE(res);
SET_RESIDUE(res, idx, LUT_BITS);
for (i = 0; i < LUT_BITS; i++) {
const int cond = even ? (i & 1) : !(i & 1);
@ -208,7 +213,8 @@ static void generate_offset_lut(DiracGolombLUT *lut, int off)
for (idx = 0; idx < LUT_SIZE; idx++) {
DiracGolombLUT *l = &lut[idx];
INIT_RESIDUE(res, idx, LUT_BITS);
INIT_RESIDUE(res);
SET_RESIDUE(res, idx, LUT_BITS);
l->preamble = CONVERT_TO_RESIDUE(res >> (RSIZE_BITS - off), off);
l->preamble_bits = off;