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| author | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-10-30 18:22:16 +0100 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-11-06 17:41:26 +0100 |
| commit | cbe6ef10314e570b7fa28572f0de57ae5eaebf1e (patch) | |
| tree | 87f64fe4a544466517d2c9b392fc1ea055e12f87 /libavcodec/msmpeg4dec.c | |
| parent | d1d30edf42da29fe4ab33c529112381cfea0a254 (diff) | |
| download | ffmpeg-cbe6ef10314e570b7fa28572f0de57ae5eaebf1e.tar.gz | |
avcodec/vc1dec: Split VC-1 decoders from msmpeg4
The only msmpeg4 code that is ever executed by the VC-1 based
decoders is ff_msmpeg4_decode_init() and what is directly
reachable from it. This is:
a) A call to av_image_check_size(), then ff_h263_decode_init(),
b) followed by setting [yc]_dc_scale_table and initializing
scantable/permutations.
c) Afterwards, some static tables are initialized.
d) Finally, slice_height is set.
The replacement for ff_msmpeg4_decode_init() performs a)
just like now; it also sets [yc]_dc_scale_table,
but it only initializes inter_scantable and intra_scantable
and not permutated_intra_[hv]_scantable: The latter are only
used inside decode_mb callbacks which are only called
in ff_h263_decode_frame() which is unused for VC-1.*
The static tables initialized in c) are not used at all by
VC-1 (the ones that are used have been factored out in
previous commits); this avoids touching 327KiB of .bss.
slice_height is also not used by the VC-1 decoder (setting
it in ff_msmpeg4_decode_init() is probably redundant after
b34397b4cd780b5692548e7d021ec884c7217dba).
*: It follows from this that the VC-1 decoder is not really
based upon the H.263 decoder either; changing this will
be done in a future commit.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Diffstat (limited to 'libavcodec/msmpeg4dec.c')
| -rw-r--r-- | libavcodec/msmpeg4dec.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/libavcodec/msmpeg4dec.c b/libavcodec/msmpeg4dec.c index dbcec3de74..26a196a38f 100644 --- a/libavcodec/msmpeg4dec.c +++ b/libavcodec/msmpeg4dec.c @@ -373,9 +373,6 @@ av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx) break; case 5: break; - case 6: - //FIXME + TODO VC1 decode mb - break; } s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe |