The Matroska muxer does not write every stream as a Matroska track;
some streams are written as AttachedFile. But should no stream be
written as a Matroska track, the Matroska muxer would nevertheless
write a Tracks element without a TrackEntry. This is against the spec.
This commit changes this and only writes a Tracks if there is a Matroska
track.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

As WebM doesn't support Attachments, the Matroska muxer drops them when
in WebM mode. This happened silently until this commit which adds a
warning for this.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

In order to determine whether the current Cluster needs to be closed
because of the limits on clustersize and clustertime,
mkv_write_packet() would first get the size of the current Cluster by
applying avio_tell() on the dynamic buffer holding the current Cluster.
It did this without checking whether there is a dynamic buffer for
writing Clusters open right now.

In this case (which happens when writing the first packet)
avio_tell() returned AVERROR(EINVAL); yet it is not good to rely on
avio_tell() (or actually, avio_seek()) to handle the situation
gracefully.

Fixing this is easy: Only check whether a Cluster needs to be closed
if a Cluster is in fact open.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

When creating DASH streams, the TrackNumber is externally prescribed
and not derived from the number of streams in the AVFormatContext, so
if the number of tracks for a file using an explicit TrackNumber was
more than one, the resulting file would be broken (it would be impossible
to tell to which track a Block belongs if different tracks share the
same TrackNumber). So disallow this.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

The Matroska muxer currently only adds CuePoints in three cases:
a) For video keyframes. b) For the first audio frame in a new Cluster if
in DASH-mode. c) For subtitles. This means that ordinary Matroska audio
files won't have any Cues which impedes seeking.

This commit changes this. For every track in a file without video track
it is checked and tracked whether a Cue entry has already been added
for said track for the current Cluster. This is used to add a Cue entry
for each first packet of each track in each Cluster.

Implements #3149.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

The Matroska file format has practically no limit on the number of
tracks (the current limit is 2^56 - 1); yet because they are encoded in
a variable length format in (Simple)Blocks this muxer has simply imposed
a limit on the number of tracks in order to ensure that they can always
be written on one byte in order to simplify the muxing process.

This commit removes said limit.

Also, zero is an invalid TrackNumber, so disallow this value in the
dash_track_number option.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

This commit factors the ability to write ordinary EBML numbers out of
the functions for writing EBML lengths. This is in preparation for
future commits.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

EBML uses variable length integers both for the EBML IDs as well as for
the EBML lengths; Matroska also uses them for the TrackNumber in
(Simple)Blocks and for the lengths of laces when EBML lacing is used.

When encoding EBML lengths, certain encodings have a special meaning,
namely that the element has an unknown length. This is not so when
encoding general EBML variable length integers.

Yet the functions called ebml_num_size() and put_ebml_num() had this
special meaning hardcoded, i.e. they are there to write EBML lengths and
not general EBML numbers. So rename them.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

Matroska (or actually EBML) uses variable-length numbers where only
seven bits of every byte is usable for the length; the other bits encode
the length of the variable-length number. So in order to find out how
many bytes one needs to encode a given number one can use a loop like
while (num >> 7 * bytes) bytes++; the Matroska muxer effectively did this.

Yet it has a disadvantage: It is impossible for the result of a single
right shift of an unsigned number with most significant bit set to be
zero, because one can only shift by 0..(width - 1). On some
architectures like x64 it is not even possible to do it with undefined
right shifts in which case this leads to an infinite loop.

This can be easily avoided by switching to a loop whose condition is
(num >>= 7). The maximum value the so modified function can return
is 10; any value > 8 is invalid and will now lead to an assert in
put_ebml_num() or in start_ebml_master() (or actually in
put_ebml_size_unknown()).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

They are not used any more by the muxer.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

Use the mime_types of the corresponding AVCodecDescriptor instead of
tables specific to Matroska. The former are generally more encompassing:
They contain every item of the current lists except "text/plain" for
AV_CODEC_ID_TEXT and "binary" for AV_CODEC_ID_BIN_DATA.

The former has been preserved by special-casing it while the latter is
a hack added in c9212abf so that the demuxer (which uses the same tables)
sets the appropriate CodecID for broken files ("binary" is not a correct
mime type at all); using it for the muxer was a mistake. The correct
mime type for AV_CODEC_ID_BIN_DATA is "application/octet-stream" and
this is what one gets from the AVCodecDescriptor.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

Found while reviewing a patch fixing a similar issue
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Per discussion at https://ffmpeg.org/pipermail/ffmpeg-devel/2020-April/260854.htmlSigned-off-by: Zane van Iperen <zane@zanevaniperen.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: James Almer <jamrial@gmail.com>

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: James Almer <jamrial@gmail.com>

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: James Almer <jamrial@gmail.com>

Decoding can be handled directly in the output frame.

Also ensure flushing cleans the reference frame in all cases.
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: James Almer <jamrial@gmail.com>

For FLAC, Speex, Opus and VP8 the Ogg muxer allocates two buffers
for building the headers: The first for extradata in an Ogg-specific
format and the second contains a Vorbiscomment. These buffers are
reachable via pointers in the corresponding AVStream's priv_data.

If an error happens during building the headers, the AVStream's
priv_data would be freed. This is pointless in general as it would be
freed generically anyway, but here it is actively harmful: If the second
of the aforementioned allocations fails, the first buffer would leak
upon freeing priv_data.

This commit stops freeing priv_data manually, which allows the muxer to
properly clean up in the deinit function.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

avformat_find_stream_info() may decode some frames to get stream
information. And when it does this for subtitles, the decoded subtitles
leak.

(Decoding subtitles was added in b1511e00
for PGS subtitles. When PGS subtitles originate from a container that
exports every segment as a packet of its own, no output will be
generated when decoding a packet, because not enough input is available.
Yet when used with PGS subtitles in the Matroska form a single packet
contains enough data to generate output. Yet said output is not freed,
hence this leak.)
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

In this example, the difference in length between the shortest and
longest string is three, so that not using pointers to strings saves
space even on 32bit systems.

Moreover, there is no need to use a sentinel here; it can be replaced
with FF_ARRAY_ELEMS.
Reviewed-by: Ross Nicholson <phunkyfish@gmail.com>
Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

Fixes Coverity ID 1462307.
Reviewed-by: Marton Balint <cus@passwd.hu>
Reviewed-by: Ross Nicholson <phunkyfish@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
Signed-off-by: Josh de Kock <josh@itanimul.li>

Signed-off-by: Josh de Kock <josh@itanimul.li>

Signed-off-by: Josh de Kock <josh@itanimul.li>

Signed-off-by: Josh de Kock <josh@itanimul.li>

Signed-off-by: Josh de Kock <josh@itanimul.li>

Fix an occasional crash for hevc decoder in ARM 32 platform, the
root cause is the memory over read(read cross the memory boundary)
in SAO NENO functions ff_hevc_sao_band_filter_neon_8 and
ff_hevc_sao_edge_filter_neon_8.

After this fix, the crash disapper in the massive Android phone
test.
Signed-off-by: qoroliang <qoroliang@tencent.com>

Protocol options like buffer_size need to be passed to the
underlying transport implementation for udp multicasts as well.
Signed-off-by: Marton Balint <cus@passwd.hu>

The x18 is a reserved platform register on Darwin and Windows.

x8/w8 seems to be unused in this function though (and same about
x10 and x14), so there's really no reason to use x18 here - just change
the uses of x18/w18 into x8/w8 instead without any further rewrites.
Signed-off-by: Martin Storsjö <martin@martin.st>

It's needed to assemble complete frames.
Signed-off-by: James Almer <jamrial@gmail.com>

The context structure of the truehd_core bsf had a pointer to a const
AVClass as its first member; yet this bsf does not have any AVClass
associated with it, so that this pointer is always NULL. So remove it.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

Fixes: signed integer overflow: 40550400 * 128 cannot be represented in type 'int'
Fixes: 20331/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RV40_fuzzer-5676685725007872

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Marton Balint <cus@passwd.hu>