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avformat/iff: rudimentary support for animations 

For now only first frame is decoded.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2014-08-18 13:36:05 +00:00
parent b0352b1997
commit b6543421f5
1 changed files with 6 additions and 0 deletions
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6
libavformat/iff.c
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@ -59,6 +59,7 @@
#define ID_RGB8 MKTAG('R','G','B','8')
#define ID_RGBN MKTAG('R','G','B','N')
#define ID_DSD MKTAG('D','S','D',' ')
#define ID_ANIM MKTAG('A','N','I','M')
#define ID_FORM MKTAG('F','O','R','M')
#define ID_FRM8 MKTAG('F','R','M','8')
@ -147,6 +148,7 @@ static int iff_probe(AVProbeData *p)
AV_RL32(d+8) == ID_ILBM ||
AV_RL32(d+8) == ID_RGB8 ||
AV_RL32(d+8) == ID_RGB8 ||
AV_RL32(d+8) == ID_ANIM ||
AV_RL32(d+8) == ID_RGBN)) ||
(AV_RL32(d) == ID_FRM8 && AV_RL32(d+12) == ID_DSD))
return AVPROBE_SCORE_MAX;
@ -358,6 +360,10 @@ static int iff_read_header(AVFormatContext *s)
avio_skip(pb, iff->is_64bit ? 8 : 4);
// codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
st->codec->codec_tag = avio_rl32(pb);
if (st->codec->codec_tag == ID_ANIM) {
avio_skip(pb, 8);
st->codec->codec_tag = avio_rl32(pb);
}
iff->bitmap_compression = -1;
iff->svx8_compression = -1;
iff->maud_bits = -1;