diff options
| author | Paul B Mahol <onemda@gmail.com> | 2016-05-18 21:52:26 +0200 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2016-05-19 16:52:30 +0200 |
| commit | a5c5ae5ed855f65f33abf27ce2f5839e07c7c8e9 (patch) | |
| tree | f730a047a177b79794dd385f7dc5c4a8690dffda | |
| parent | e34e7a575eaec6d15934c3510abc3c9c9a2d63ae (diff) | |
avcodec/iff: add support for ANBR files
Signed-off-by: Paul B Mahol <onemda@gmail.com>
| -rw-r--r-- | libavcodec/iff.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/libavcodec/iff.c b/libavcodec/iff.c index dc3cb4b80f..f92f2385b4 100644 --- a/libavcodec/iff.c +++ b/libavcodec/iff.c @@ -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) { |