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authorAndreas Rheinhardt <andreas.rheinhardt@outlook.com>2022-10-30 18:22:16 +0100
committerAndreas Rheinhardt <andreas.rheinhardt@outlook.com>2022-11-06 17:41:26 +0100
commitcbe6ef10314e570b7fa28572f0de57ae5eaebf1e (patch)
tree87f64fe4a544466517d2c9b392fc1ea055e12f87 /libavfilter/vsrc_mptestsrc.c
parentd1d30edf42da29fe4ab33c529112381cfea0a254 (diff)
downloadffmpeg-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 'libavfilter/vsrc_mptestsrc.c')
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