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avcodec/iff: add support for ANBR files

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2016-05-18 21:52:26 +02:00
parent e34e7a575e
commit a5c5ae5ed8
1 changed files with 18 additions and 6 deletions
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24
libavcodec/iff.c
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@ -53,6 +53,7 @@ typedef struct IffContext {
unsigned compression; ///< delta compression method used
unsigned is_short; ///< short compression method used
unsigned is_interlaced;///< video is interlaced
unsigned is_brush; ///< video is in ANBR format
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
@ -230,6 +231,7 @@ static int extract_header(AVCodecContext *const avctx,
bytestream2_skip(gb, 19);
extra = bytestream2_get_be32(gb);
s->is_short = !(extra & 1);
s->is_brush = extra == 2;
s->is_interlaced = !!(extra & 0x40);
data_size -= 24;
bytestream2_skip(gb, data_size + (data_size & 1));
@ -763,7 +765,7 @@ static void decode_short_horizontal_delta(uint8_t *dst,
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)
int w, int xor, int bpp, int dst_size)
{
int ncolumns = ((w + 15) / 16) * 2;
int dstpitch = ncolumns * bpp;
@ -798,7 +800,11 @@ static void decode_byte_vertical_delta(uint8_t *dst,
while (opcode) {
bytestream2_seek_p(&pb, ofsdst, SEEK_SET);
bytestream2_put_byte(&pb, x);
if (xor && ofsdst < dst_size) {
bytestream2_put_byte(&pb, dst[ofsdst] ^ x);
} else {
bytestream2_put_byte(&pb, x);
}
ofsdst += dstpitch;
opcode--;
}
@ -809,7 +815,11 @@ static void decode_byte_vertical_delta(uint8_t *dst,
while (opcode) {
bytestream2_seek_p(&pb, ofsdst, SEEK_SET);
bytestream2_put_byte(&pb, bytestream2_get_byte(&gb));
if (xor && ofsdst < dst_size) {
bytestream2_put_byte(&pb, dst[ofsdst] ^ bytestream2_get_byte(&gb));
} else {
bytestream2_put_byte(&pb, bytestream2_get_byte(&gb));
}
ofsdst += dstpitch;
opcode--;
}
@ -1627,7 +1637,7 @@ static int decode_frame(AVCodecContext *avctx,
break;
case 0x500:
case 0x501:
decode_byte_vertical_delta(s->video[0], buf, buf_end, avctx->width, s->bpp, s->video_size);
decode_byte_vertical_delta(s->video[0], buf, buf_end, avctx->width, s->is_brush, s->bpp, s->video_size);
break;
case 0x700:
case 0x701:
@ -1719,8 +1729,10 @@ static int decode_frame(AVCodecContext *avctx,
return unsupported(avctx);
}
FFSWAP(uint8_t *, s->video[0], s->video[1]);
FFSWAP(uint32_t *, s->pal[0], s->pal[1]);
if (!s->is_brush) {
FFSWAP(uint8_t *, s->video[0], s->video[1]);
FFSWAP(uint32_t *, s->pal[0], s->pal[1]);
}
}
if (avpkt->flags & AV_PKT_FLAG_KEY) {