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  1. 19 May, 2020 9 commits
  3. 18 May, 2020 10 commits
    • Andreas Rheinhardt's avatar
      avformat/matroskaenc: Don't assert when writing huge files · 575557ce
      Andreas Rheinhardt authored 
      EBML numbers are variable length numbers: Only seven bits of every byte
are available to encode the number, the other bits encode the length of
the number itself. So an eight byte EBML number can only encode numbers
in the range 0..(2^56 - 1). And when using EBML numbers to encode the
length of an EBML element, the EBML number corresponding to 2^56 - 1 is
actually reserved to mean that the length of the corresponding element
is unknown.

And therefore put_ebml_length() asserted that the length it should
represent is < 2^56 - 1. Yet there was nothing that actually guaranteed
this to be true for the Segment (the main/root EBML element of a
Matroska file that encompasses nearly the whole file). This commit
changes this by checking in advance how big the length is and only
updating the number if it is representable at all; if not, the unknown
length element is not touched.
Signed-off-by: 's avatarAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
      575557ce
    • Andreas Rheinhardt's avatar
      avformat/matroskaenc: Avoid unnecessary seek · efeb3a53
      Andreas Rheinhardt authored 
      The Matroska muxer has a pair of functions designed to write master
elements whose exact length is not known in advance: start_ebml_master()
and end_ebml_master(). The first one of these would write the EBML ID of
the master element that is about to be started, reserve some bytes for
the length field and record the current position as well as how many
bytes were used for the length field. When writing the master's contents
is finished, end_ebml_master() gets the current position (at the end of
the master element), seeks to the length field using the recorded
position, writes the length field and seeks back to the end of the
master element so that one can continue writing other elements.

But if one wants to modify the content of the master element itself,
then the seek back is superfluous. This is the scenario that presents
itself when writing the trailer: One wants to update several elements
contained in the Segment master element (this is the main/root master
element of a Matroska file) that were already written when writing the
header. The current approach is to seek to the beginning of the file
to update the elements, then seek to the end, call end_ebml_master()
which immediately seeks to the beginning to write the length and seeks
back. The seek to the end (which has only been performed because
end_ebml_master() uses the initial position to determine the length
of the master element) and the seek back are of course superfluous.

This commit avoids these seeks by no longer using start/end_ebml_master()
to write the segment's length field. Instead, it is now written
manually. The new approach is: Seek to the beginning to write the length
field, then update the elements (in the order they appear in the file)
and seek back to the end.

This reduces the ordinary amount of seeks of the Matroska muxer to two
(ordinary excludes scenarios where one has big Chapters or Attachments
or where one writes the Cues at the front).
Signed-off-by: 's avatarAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
      efeb3a53
    • Andreas Rheinhardt's avatar
      avformat/matroskaenc: Only write Cues at the front if space has been reserved · a54c94d9
      Andreas Rheinhardt authored 
      If the AVIOContext for output was unseekable when writing the header,
no space for Cues would be reserved even if the reserve_index_space
option was used (because it is reasonable to expect that one can't seek
back to the beginning to write the Cues anyway). But if the AVIOContext
was seekable when writing the trailer, it was presumed that space for
the Cues had been reserved when the reserve_index_space option indicated
so even when it was not. As a result, the beginning of the file would be
overwritten.

This commit fixes this: If the reserve_index_space option had been used
and no space has been reserved in advance because of unseekability when
writing the header, then no attempt to write Cues will be performed
when writing the trailer; after all, writing them at the front is
impossible and writing them at the end is probably undesired.
Signed-off-by: 's avatarAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
      a54c94d9
    • Andreas Rheinhardt's avatar
      avformat/matroskaenc: Don't reserve space for duration when unseekable · 81e39cf4
      Andreas Rheinhardt authored 
      We won't be able to seek back to write the actual duration anyway.

FATE-tests using the md5pipe command had to be updated due to this change.
Signed-off-by: 's avatarAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
      81e39cf4
    • Andreas Rheinhardt's avatar
      avformat/matroskaenc: Remove inconsistencies wrt seekability handling · 1779f0b1
      Andreas Rheinhardt authored 
      The Matroska muxer behaves differently in several ways when it thinks
that it is in unseekable/livestreaming mode: It does not add Cue entries
because they won't be written anyway for a livestream and it writes some
elements only preliminarily (with the intention to overwrite them with
an updated version at the end) when non-livestreaming etc.

There are two ways to set the Matroska muxer into livestreaming mode:
Setting an option or by providing an unseekable AVIOContext. Yet the
actual checks were not consistent:

If the AVIOContext was unseekable and no AAC extradata was available
when writing the header, writing the header failed; but if the AVIOContext
was seekable, it didn't, because the muxer expected to get the extradata
via packet side-data. Here the livestreaming option has not been checked,
although one can't use the updated extradata in case it is a livestream.

If the reserve_index_space option was used, space for writing Cues would
be reserved when writing the header unless the AVIOContext was
unseekable. Yet Cues were only written if the livestreaming option was
not set and the AVIOContext was seekable (when writing the trailer), so
if the AVIOContext was seekable and the livestreaming option set, the
reserved space would never be used at all.

If the AVIOContext was unseekable and the livestreaming option was not
set, it would be attempted to update the main length field at the end.
After all, it might be possible that the file is so short that it fits
into the AVIOContext's buffer in which case the seek back would work.
Yet this is dangerous: It might be that we are not dealing with a
simple output file, but that our output gets split into chunks and that
each of these chunks is actually seekable. In this case some part of the
last chunk (namely the eight bytes that have the same offset as the
length field had in the header) will be overwritten with what the muxer
wrongly believes to be the filesize.
(The livestreaming option has been added to deal with this scenario,
yet its documentation ("Write files assuming it is a live stream.")
doesn't make this clear at all. At least the segment muxer does not
set the option for live and given that the chances of successfully
seeking when the output is actually unseekable are slim, it is best to
not attempt to update the length field in the unseekable case at all.)

All these inconsistencies were fixed by treating the output as seekable
if the livestreaming option is not set and if the AVIOContext is
seekable. A macro has been used to enforce consistency and improve code
readability.
Signed-off-by: 's avatarAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
      1779f0b1
    • Andreas Rheinhardt's avatar
      avformat/matroskaenc: Don't segfault when seekability changes · 8aabcf6c
      Andreas Rheinhardt authored 
      If the Matroska muxer's AVIOContext was unseekable when writing the
header, but is seekable when writing the trailer, the code for writing
the trailer presumes that a dynamic buffer exists and tries to update
its content in order to overwrite data that has already been
preliminarily written when writing the header, yet said buffer doesn't
exist as it has been written finally and not preliminarily when writing
the header (because of the unseekability it was presumed that one won't
be able to update the data anyway).

This commit adds a check for this and also for a similar situation
involving updating extradata with new data from packet side-data.
Signed-off-by: 's avatarAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
      8aabcf6c
    • James Almer's avatar
      avcodec/frame_thread_encoder: check for frame threading codec cap instead of intra only · 6275a7ec
      James Almer authored 
      It's the correct dedicated capability reported by supported encoders.
Otherwise, the frame thread path will be used for unsupported encoders
like r210 for no gain.
Reviewed-by: 's avatarAnton Khirnov <anton@khirnov.net>
Signed-off-by: 's avatarJames Almer <jamrial@gmail.com>
      6275a7ec
    • James Almer's avatar
      avcodec/libdav1d: export frame sample aspect ratio · 49220869
      James Almer authored 
      Reviewed-by: 's avatarAnton Khirnov <anton@khirnov.net>
Signed-off-by: 's avatarJames Almer <jamrial@gmail.com>
      49220869
    • Linjie Fu's avatar
      lavc/qsvenc: add encode support for HEVC 4:2:2 8-bit and 10-bit · 8999a2f2
      Linjie Fu authored 
      Enables HEVC Range Extension encoding support (Linux) for 4:2:2 8/10 bit
on ICL+ (gen11 +) platform.

Restricted to linux only for now.
Signed-off-by: 's avatarLinjie Fu <linjie.fu@intel.com>
      8999a2f2
    • Linjie Fu's avatar
      lavc/qsvdec: add decode support for HEVC 4:2:2 8-bit and 10-bit · 9723d7d5
      Linjie Fu authored 
      Enables HEVC Range Extension decoding support (Linux) for 4:2:2 8/10 bit
on ICL+ (gen11 +) platform.

Restricted to linux only for now.
Signed-off-by: 's avatarLinjie Fu <linjie.fu@intel.com>
      9723d7d5
  5. 17 May, 2020 4 commits
    • Andreas Rheinhardt's avatar
      avformat/hlsenc: Don't segfault on uncommon names · 3ab6a923
      Andreas Rheinhardt authored 
      The parsing process of the AVOpt-enabled string controlling the mapping
of input streams to variant streams is roughly as follows: Space and tab
separate variant stream group maps while the entries in each variant
stream group map are separated by ','.

The parsing process of each variant stream group proceeded as follows:
At first the number of occurences of "a:", "v:" and "s:" in each variant
stream group is calculated so that one can can allocate an array of
streams with this number of entries. Then the string is split along ','
and each substring is parsed. If such a substring starts with "a:", "s:"
or "v:" it is treated as stream specifier and (if there is a correct
number after ':') a stream of the variant stream is mapped to one of the
actual input streams.

Nothing actually guarantees that the number of streams allocated initially
equals the number of streams that are mapped to an actual input stream.
These numbers can differ if e.g. the name, the sgroup, agroup or ccgroup
of the variant stream contain "a:", "s:" or "v:".

The problem hereby is that the rest of the code presumes these numbers
to be equal and segfaults if it isn't (because the corresponding input
stream is NULL).

This commit fixes this by modifying the initial counting process to only
count occurences of "a:", "s:" or "v:" that are at the beginning or that
immediately follow a ','.
Signed-off-by: 's avatarAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
      3ab6a923
    • James Almer's avatar
      avutil: bump version after addition of av_sat_add64 and av_sat_sub64 · 84af196c
      James Almer authored 
      Signed-off-by: 's avatarJames Almer <jamrial@gmail.com>
      84af196c
    • Michael Niedermayer's avatar
      avformat/mpegts: Shuffle avio_seek · cd74af14
      Michael Niedermayer authored 
      This avoids accessing an old, no longer valid buffer.
Fixes: out of array access
Fixes: crash_audio-2020
Found-by: 's avatarle wu <shoulewoba@gmail.com>
Reviewed-by: 's avatarMarton Balint <cus@passwd.hu>
Signed-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
      cd74af14
    • Derek Buitenhuis's avatar
      avformat/dump: Use int64_t for intermediate time values · 5d9ce445
      Derek Buitenhuis authored 
      Prevents wrap-around to negative values while calculating the duration string.

Before:

    Duration: -411422:-59:-42.17, start: 0.000000, bitrate: 0 kb/s

After:

    Duration: 781623:28:34.17, start: 0.000000, bitrate: 0 kb/s
Signed-off-by: 's avatarDerek Buitenhuis <derek.buitenhuis@gmail.com>
      5d9ce445
  7. 16 May, 2020 7 commits
  9. 15 May, 2020 10 commits