int changed_size;
int factor;
- unsigned sindex;
+ unsigned lo;
+ unsigned hi;
ScanTable intra_scantable;
DECLARE_ALIGNED(32, int16_t, block)[6][64];
}
static int decode_block(AVCodecContext *avctx, GetBitContext *gb,
- int block, int factor, int flag)
+ int block, int factor, int flag, int offset)
{
IMM4Context *s = avctx->priv_data;
const uint8_t *scantable = s->intra_scantable.permutated;
i += len;
if (i >= 64)
break;
- s->block[block][scantable[i]] = factor * factor2;
+ s->block[block][scantable[i]] = offset * (factor2 < 0 ? -1 : 1) + factor * factor2;
if (last)
break;
}
}
static int decode_blocks(AVCodecContext *avctx, GetBitContext *gb,
- unsigned cbp, int flag)
+ unsigned cbp, int flag, int offset)
{
IMM4Context *s = avctx->priv_data;
const uint8_t *scantable = s->intra_scantable.permutated;
}
if (cbp & (1 << (5 - i))) {
- ret = decode_block(avctx, gb, i, s->factor, flag);
+ ret = decode_block(avctx, gb, i, s->factor, flag, offset);
if (ret < 0)
return ret;
}
static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
{
IMM4Context *s = avctx->priv_data;
- int ret, x, y;
+ int ret, x, y, offset = 0;
- s->factor = intra_cb[s->sindex];
+ if (s->hi == 0) {
+ if (s->lo > 2)
+ return AVERROR_INVALIDDATA;
+ s->factor = intra_cb[s->lo];
+ } else {
+ if (s->hi == 1) {
+ s->factor = s->lo * 2;
+ } else {
+ s->factor = s->lo * 2;
+ }
+ }
+
+ if (s->hi) {
+ offset = s->factor;
+ offset >>= 1;
+ if (!(offset & 1))
+ offset--;
+ }
for (y = 0; y < avctx->height; y += 16) {
for (x = 0; x < avctx->width; x += 16) {
cbphi = get_cbphi(gb, 1);
- ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0);
+ ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0, offset);
if (ret < 0)
return ret;
AVFrame *frame, AVFrame *prev)
{
IMM4Context *s = avctx->priv_data;
- int ret, x, y;
+ int ret, x, y, offset = 0;
- s->factor = inter_cb[s->sindex];
+ if (s->hi == 0) {
+ if (s->lo > 2)
+ return AVERROR_INVALIDDATA;
+ s->factor = inter_cb[s->lo];
+ } else {
+ if (s->hi == 1) {
+ s->factor = s->lo * 2;
+ } else {
+ s->factor = s->lo * 2;
+ }
+ }
+
+ if (s->hi) {
+ offset = s->factor;
+ offset >>= 1;
+ if (!(offset & 1))
+ offset--;
+ }
for (y = 0; y < avctx->height; y += 16) {
for (x = 0; x < avctx->width; x += 16) {
cbplo = value >> 4;
cbphi = get_cbphi(gb, reverse);
if (intra_block) {
- ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0);
+ ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0, offset);
if (ret < 0)
return ret;
frame->linesize[2], s->block[5]);
} else {
skip_bits(gb, 2);
- ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 1);
+ ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 1, offset);
if (ret < 0)
return ret;
s->changed_size = 1;
skip_bits_long(gb, 24 * 8);
type = get_bits_long(gb, 32);
- skip_bits(gb, 16);
- s->sindex = get_bits(gb, 16);
- s->sindex = FFMIN(s->sindex, 2);
+ s->hi = get_bits(gb, 16);
+ s->lo = get_bits(gb, 16);
switch (type) {
case 0x19781977: