int factor;
unsigned sindex;
+ ScanTable intra_scantable;
DECLARE_ALIGNED(32, int16_t, block)[6][64];
IDCTDSPContext idsp;
} IMM4Context;
static const uint8_t intra_cb[] = {
- 12, 9, 6
+ 24, 18, 12
};
static const uint8_t inter_cb[] = {
int block, int factor, int flag)
{
IMM4Context *s = avctx->priv_data;
+ const uint8_t *scantable = s->intra_scantable.permutated;
int i, last, len, factor2;
for (i = !flag; i < 64; i++) {
i += len;
if (i >= 64)
break;
- s->block[block][i] = factor * factor2;
+ s->block[block][scantable[i]] = factor * factor2;
if (last)
break;
}
unsigned cbp, int flag)
{
IMM4Context *s = avctx->priv_data;
+ const uint8_t *scantable = s->intra_scantable.permutated;
int ret, i;
memset(s->block, 0, sizeof(s->block));
x = 128;
x *= 8;
- s->block[i][0] = x;
+ s->block[i][scantable[0]] = x;
}
if (cbp & (1 << (5 - i))) {
IMM4Context *s = avctx->priv_data;
int ret, x, y;
- s->factor = intra_cb[s->sindex] * 2;
+ s->factor = intra_cb[s->sindex];
for (y = 0; y < avctx->height; y += 16) {
for (x = 0; x < avctx->width; x += 16) {
s->changed_size = 1;
skip_bits_long(gb, 24 * 8);
type = get_bits_long(gb, 32);
- s->sindex = get_bits_long(gb, 32);
- if (s->sindex > 2)
- return AVERROR_INVALIDDATA;
+ skip_bits(gb, 16);
+ s->sindex = get_bits(gb, 16);
+ s->sindex = FFMIN(s->sindex, 2);
switch (type) {
case 0x19781977:
{
static AVOnce init_static_once = AV_ONCE_INIT;
IMM4Context *s = avctx->priv_data;
+ uint8_t table[64];
+
+ for (int i = 0; i < 64; i++)
+ table[i] = i;
- avctx->idct_algo = FF_IDCT_FAAN;
ff_bswapdsp_init(&s->bdsp);
ff_idctdsp_init(&s->idsp, avctx);
+ ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, table);
s->prev_frame = av_frame_alloc();
if (!s->prev_frame)