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ffmpeg.wasm-core
Commit eef2f642 authored by Paul B Mahol's avatar Paul B Mahol
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avcodec/iff: scala anim32 & anim16 decompression 

Signed-off-by: 's avatarPaul B Mahol <onemda@gmail.com>
parent 936751b6
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Showing with 128 additions and 2 deletions
libavcodec/iff.c
View file @ eef2f642
......@@ -52,6 +52,7 @@ typedef struct IffContext {
uint32_t *mask_palbuf; ///< masking palette table
unsigned compression; ///< delta compression method used
unsigned is_short; ///< short compression method used
unsigned is_interlaced;///< video is interlaced
unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
unsigned flags; ///< 1 for EHB, 0 is no extra half darkening
......@@ -221,12 +222,15 @@ static int extract_header(AVCodecContext *const avctx,
if (chunk_id == MKTAG('B', 'M', 'H', 'D')) {
bytestream2_skip(gb, data_size + (data_size & 1));
} else if (chunk_id == MKTAG('A', 'N', 'H', 'D')) {
unsigned extra;
if (data_size < 40)
return AVERROR_INVALIDDATA;
s->compression = (bytestream2_get_byte(gb) << 8) | (s->compression & 0xFF);
bytestream2_skip(gb, 19);
s->is_short = !(bytestream2_get_be32(gb) & 1);
extra = bytestream2_get_be32(gb);
s->is_short = !(extra & 1);
s->is_interlaced = !!(extra & 0x40);
data_size -= 24;
bytestream2_skip(gb, data_size + (data_size & 1));
} else if (chunk_id == MKTAG('D', 'L', 'T', 'A') ||
......@@ -1213,6 +1217,116 @@ static void decode_long_vertical_delta2(uint8_t *dst,
}
}
static void decode_delta_d(uint8_t *dst,
const uint8_t *buf, const uint8_t *buf_end,
int w, int flag, int bpp, int dst_size)
{
int planepitch = FFALIGN(w, 16) >> 3;
int pitch = planepitch * bpp;
int planepitch_byte = (w + 7) / 8;
unsigned entries, ofssrc;
GetByteContext gb, ptrs;
PutByteContext pb;
int k;
if (buf_end - buf <= 4 * bpp)
return;
bytestream2_init_writer(&pb, dst, dst_size);
bytestream2_init(&ptrs, buf, bpp * 4);
for (k = 0; k < bpp; k++) {
ofssrc = bytestream2_get_be32(&ptrs);
if (!ofssrc)
continue;
if (ofssrc >= buf_end - buf)
continue;
bytestream2_init(&gb, buf + ofssrc, buf_end - (buf + ofssrc));
entries = bytestream2_get_be32(&gb);
while (entries) {
int32_t opcode = bytestream2_get_be32(&gb);
unsigned offset = bytestream2_get_be32(&gb);
bytestream2_seek_p(&pb, (offset / planepitch_byte) * pitch + (offset % planepitch_byte) + k * planepitch, SEEK_SET);
if (opcode >= 0) {
uint32_t x = bytestream2_get_be32(&gb);
while (opcode && bytestream2_get_bytes_left_p(&pb) > 0) {
bytestream2_put_be32(&pb, x);
bytestream2_skip_p(&pb, pitch - 4);
opcode--;
}
} else {
opcode = -opcode;
while (opcode && bytestream2_get_bytes_left(&gb) > 0) {
bytestream2_put_be32(&pb, bytestream2_get_be32(&gb));
bytestream2_skip_p(&pb, pitch - 4);
opcode--;
}
}
entries--;
}
}
}
static void decode_delta_e(uint8_t *dst,
const uint8_t *buf, const uint8_t *buf_end,
int w, int flag, int bpp, int dst_size)
{
int planepitch = FFALIGN(w, 16) >> 3;
int pitch = planepitch * bpp;
int planepitch_byte = (w + 7) / 8;
unsigned entries, ofssrc;
GetByteContext gb, ptrs;
PutByteContext pb;
int k;
if (buf_end - buf <= 4 * bpp)
return;
bytestream2_init_writer(&pb, dst, dst_size);
bytestream2_init(&ptrs, buf, bpp * 4);
for (k = 0; k < bpp; k++) {
ofssrc = bytestream2_get_be32(&ptrs);
if (!ofssrc)
continue;
if (ofssrc >= buf_end - buf)
continue;
bytestream2_init(&gb, buf + ofssrc, buf_end - (buf + ofssrc));
entries = bytestream2_get_be16(&gb);
while (entries) {
int16_t opcode = bytestream2_get_be16(&gb);
unsigned offset = bytestream2_get_be32(&gb);
bytestream2_seek_p(&pb, (offset / planepitch_byte) * pitch + (offset % planepitch_byte) + k * planepitch, SEEK_SET);
if (opcode >= 0) {
uint16_t x = bytestream2_get_be16(&gb);
while (opcode && bytestream2_get_bytes_left_p(&pb) > 0) {
bytestream2_put_be16(&pb, x);
bytestream2_skip_p(&pb, pitch - 2);
opcode--;
}
} else {
opcode = -opcode;
while (opcode && bytestream2_get_bytes_left(&gb) > 0) {
bytestream2_put_be16(&pb, bytestream2_get_be16(&gb));
bytestream2_skip_p(&pb, pitch - 2);
opcode--;
}
}
entries--;
}
}
}
static void decode_delta_l(uint8_t *dst,
const uint8_t *buf, const uint8_t *buf_end,
int w, int flag, int bpp, int dst_size)
......@@ -1279,7 +1393,7 @@ static void decode_delta_l(uint8_t *dst,
static int unsupported(AVCodecContext *avctx)
{
IffContext *s = avctx->priv_data;
avpriv_request_sample(avctx, "bitmap (compression 0x%0x, bpp %i, ham %i)", s->compression, s->bpp, s->ham);
avpriv_request_sample(avctx, "bitmap (compression 0x%0x, bpp %i, ham %i, interlaced %i)", s->compression, s->bpp, s->ham, s->is_interlaced);
return AVERROR_INVALIDDATA;
}
......@@ -1533,6 +1647,18 @@ static int decode_frame(AVCodecContext *avctx,
case 0x4a01:
decode_delta_j(s->video[0], buf, buf_end, avctx->width, avctx->height, s->bpp, s->video_size);
break;
case 0x6400:
case 0x6401:
if (s->is_interlaced)
return unsupported(avctx);
decode_delta_d(s->video[0], buf, buf_end, avctx->width, s->is_interlaced, s->bpp, s->video_size);
break;
case 0x6500:
case 0x6501:
if (s->is_interlaced)
return unsupported(avctx);
decode_delta_e(s->video[0], buf, buf_end, avctx->width, s->is_interlaced, s->bpp, s->video_size);
break;
case 0x6c00:
case 0x6c01:
decode_delta_l(s->video[0], buf, buf_end, avctx->width, s->is_short, s->bpp, s->video_size);
......
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