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avcodec/rka: improve VRQ mode decoding

This commit is contained in:
Paul B Mahol 2023-09-30 15:01:38 +02:00
parent 8bfadacfd1
commit ead1426a68
1 changed files with 15 additions and 11 deletions
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26
libavcodec/rka.c
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@ -165,8 +165,12 @@ static av_cold int rka_decode_init(AVCodecContext *avctx)
qfactor = -qfactor;
s->ch[0].qfactor = s->ch[1].qfactor = qfactor < 0 ? 2 : qfactor;
s->ch[0].vrq = qfactor < 0 ? FFABS(qfactor) : 0;
s->ch[1].vrq = qfactor < 0 ? FFABS(qfactor) : 0;
s->ch[0].vrq = qfactor < 0 ? -qfactor : 0;
s->ch[1].vrq = qfactor < 0 ? -qfactor : 0;
if (qfactor < 0) {
s->ch[0].vrq = av_clip(s->ch[0].vrq, 1, 8);
s->ch[1].vrq = av_clip(s->ch[1].vrq, 1, 8);
}
av_log(avctx, AV_LOG_DEBUG, "qfactor: %d\n", qfactor);
return 0;
@ -665,16 +669,14 @@ static int mdl64_decode(ACoder *ac, Model64 *ctx, int *dst)
return 0;
}
static const uint8_t tab[16] = {
0, 3, 3, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0
};
static const uint8_t vrq_qfactors[8] = { 3, 3, 2, 2, 1, 1, 1, 1 };
static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, unsigned size)
{
FiltCoeffs filt;
Model64 *mdl64;
int m = 0, split, val, last_val = 0, ret;
unsigned idx = 3, bits = 0;
int split, val, last_val = 0, ret;
unsigned rsize, idx = 3, bits = 0, m = 0;
if (ctx->qfactor == 0) {
if (amdl_decode_int(&ctx->fshift, ac, &bits, 15) < 0)
@ -698,10 +700,12 @@ static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, uns
if (amdl_decode_int(&ctx->position, ac, &idx, 10) < 0)
return -1;
m = 0;
idx = (ctx->pos_idx + idx) % 11;
ctx->pos_idx = idx;
for (int y = 0; y < FFMIN(split, size - x); y++, off++) {
rsize = FFMIN(split, size - x);
for (int y = 0; y < rsize; y++, off++) {
int midx, shift = idx, *src, sum = 16;
if (off >= FF_ARRAY_ELEMS(ctx->buf0))
@ -750,10 +754,10 @@ static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, uns
}
if (ctx->vrq != 0) {
int sum = 0;
for (int i = (signed)((unsigned)m << 6) / split; i > 0; i = i >> 1)
for (unsigned i = (m << 6) / rsize; i > 0; i = i >> 1)
sum++;
sum = sum - (ctx->vrq + 7);
ctx->qfactor = FFMAX(sum, tab[ctx->vrq]);
sum -= (ctx->vrq + 7);
ctx->qfactor = FFMAX(sum, vrq_qfactors[ctx->vrq - 1]);
}
x += split;