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avcodec/iff: implement 3rd delta ANIM decompression 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2016-05-12 23:54:26 +02:00
parent 8ba257bac6
commit 01ead2a639
1 changed files with 57 additions and 0 deletions
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57
libavcodec/iff.c
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@ -706,6 +706,59 @@ static void decode_deep_tvdc32(uint8_t *dst, const uint8_t *src, int src_size, i
}
}
static void decode_short_horizontal_delta(uint8_t *dst,
const uint8_t *buf, const uint8_t *buf_end,
int w, int bpp, int dst_size)
{
int planepitch = FFALIGN(w, 16) >> 3;
int pitch = planepitch * bpp;
GetByteContext ptrs, gb;
PutByteContext pb;
unsigned ofssrc, pos;
int i, k;
bytestream2_init(&ptrs, buf, buf_end - buf);
bytestream2_init_writer(&pb, dst, dst_size);
for (k = 0; k < bpp; k++) {
ofssrc = bytestream2_get_be32(&ptrs);
pos = 0;
if (!ofssrc)
continue;
if (ofssrc >= buf_end - buf)
continue;
bytestream2_init(&gb, buf + ofssrc, buf_end - (buf + ofssrc));
while (bytestream2_peek_be16(&gb) != 0xFFFF && bytestream2_get_bytes_left(&gb) > 3) {
int16_t offset = bytestream2_get_be16(&gb);
unsigned noffset;
if (offset >= 0) {
unsigned data = bytestream2_get_be16(&gb);
pos += offset * 2;
noffset = (pos / planepitch) * pitch + (pos % planepitch) + k * planepitch;
bytestream2_seek_p(&pb, noffset, SEEK_SET);
bytestream2_put_be16(&pb, data);
} else {
uint16_t count = bytestream2_get_be16(&gb);
pos += 2 * -(offset + 2);
for (i = 0; i < count; i++) {
uint16_t data = bytestream2_get_be16(&gb);
pos += 2;
noffset = (pos / planepitch) * pitch + (pos % planepitch) + k * planepitch;
bytestream2_seek_p(&pb, noffset, SEEK_SET);
bytestream2_put_be16(&pb, data);
}
}
}
}
}
static void decode_byte_vertical_delta(uint8_t *dst,
const uint8_t *buf, const uint8_t *buf_end,
int w, int bpp, int dst_size)
@ -1458,6 +1511,10 @@ static int decode_frame(AVCodecContext *avctx,
} else
return unsupported(avctx);
break;
case 0x300:
case 0x301:
decode_short_horizontal_delta(s->video[0], buf, buf_end, avctx->width, s->bpp, s->video_size);
break;
case 0x500:
case 0x501:
decode_byte_vertical_delta(s->video[0], buf, buf_end, avctx->width, s->bpp, s->video_size);