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Andreas Rheinhardt dc2f6b54ac avformat/matroskaenc: Avoid allocations for SeekHead 
Up until e7ddafd5, the Matroska muxer wrote two SeekHeads: One at the
beginning referencing the main level 1 elements (i.e. not the Clusters)
and one at the end, referencing the Clusters. This second SeekHead was
useless and has therefore been removed. Yet the SeekHead-related
functions and structures are still geared towards this usecase: They
are built around an allocated array of variable size that gets
reallocated every time an element is added to it although the maximum
number of Seek entries is a small compile-time constant, so that one should
rather include the array in the SeekHead structure itself; and said
structure should be contained in the MatroskaMuxContext instead of being
allocated separately.

The earlier code reserved space for a SeekHead with 10 entries, although
we currently write at most 6. Reducing said number implied that every
Matroska/Webm file will be 84 bytes smaller and required to adapt
several FATE tests; furthermore, the reserved amount overestimated the
amount needed for for the SeekHead's length field and how many bytes
need to be reserved to write a EBML Void element, bringing the total
reduction to 89 bytes.

This also fixes a potential segfault: If !mkv->is_live and if the
AVIOContext is initially unseekable when writing the header, the
SeekHead is already written when writing the header and this used to
free the SeekHead-related structures that have been allocated. But if
the AVIOContext happens to be seekable when writing the trailer, it will
be attempted to write the SeekHead again which will lead to segfaults
because the corresponding structures have already been freed.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
 		2020-03-26 03:19:56 +01:00
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aiff Merge commit 'eb8a8115994434b548523cf0bca6a4a74784e79c' 2019-03-14 14:19:03 -03:00
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flv Merge commit '618d02c1fa9e74d490cace64a7d15762656b521c' 2019-03-14 14:36:24 -03:00
gbrap.fits Merge commit 'f8df5e2f31a5ba7b30a0e1caaaf5a03c753b3f9b' 2019-03-14 14:59:45 -03:00
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gbrp.fits Merge commit 'f8df5e2f31a5ba7b30a0e1caaaf5a03c753b3f9b' 2019-03-14 14:59:45 -03:00
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gray.xwd Merge commit 'a957e9379d11f2982d615f92c30580a57ea8bb40' 2019-03-14 14:30:08 -03:00
gray16be.fits avcodec/fitsdec: Use lrint() 2019-12-05 20:20:05 +01:00
gray16be.pam fate/lavf-image: fix passed arguments for some high bit depth tests 2019-03-14 17:15:28 -03:00
gray16be.png Merge commit 'a957e9379d11f2982d615f92c30580a57ea8bb40' 2019-03-14 14:30:08 -03:00
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ircam Merge commit 'eb8a8115994434b548523cf0bca6a4a74784e79c' 2019-03-14 14:19:03 -03:00
ismv avformat/movenc: write the major brand also as the first compatible brand 2019-12-21 11:57:28 -03:00
jpg Merge commit 'a957e9379d11f2982d615f92c30580a57ea8bb40' 2019-03-14 14:30:08 -03:00
mka avformat/matroskaenc: Avoid allocations for SeekHead 2020-03-26 03:19:56 +01:00
mkv avformat/matroskaenc: Avoid allocations for SeekHead 2020-03-26 03:19:56 +01:00
mkv_attachment avformat/matroskaenc: Avoid allocations for SeekHead 2020-03-26 03:19:56 +01:00
mmf Merge commit 'eb8a8115994434b548523cf0bca6a4a74784e79c' 2019-03-14 14:19:03 -03:00
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monow.xwd Merge commit 'a957e9379d11f2982d615f92c30580a57ea8bb40' 2019-03-14 14:30:08 -03:00
mov avformat/movenc: ensure we don't write the major brand as a compatible brand more than once 2019-12-21 11:57:28 -03:00
mov_rtphint avformat/movenc: ensure we don't write the major brand as a compatible brand more than once 2019-12-21 11:57:28 -03:00
mp4 avformat/movenc: ensure we don't write the major brand as a compatible brand more than once 2019-12-21 11:57:28 -03:00
mpg Merge commit '618d02c1fa9e74d490cace64a7d15762656b521c' 2019-03-14 14:36:24 -03:00
mxf avformat/mxfenc: use a zero based continuity counter 2020-03-02 22:01:47 +01:00
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rgb48be.pam fate/lavf-image: fix passed arguments for some high bit depth tests 2019-03-14 17:15:28 -03:00
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rgb48le_10.dpx fate/lavf-image: fix passed arguments for some high bit depth tests 2019-03-14 17:15:28 -03:00
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ts avformat/mpegtsenc: get rid of packet counting for sdt/pat/pmt 2019-08-23 22:49:01 +02:00
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