Fixes invalid writes with invalid multichannel streams.

CC:libav-stable@libav.org

Signed-off-by: Anton Khirnov <anton@khirnov.net>

The buffer pool has to atomically add and remove entries from the linked
list of available buffers. This was done by removing the entire list
with a CAS operation, working on it, and then setting it back again
(using a retry-loop in case another thread was doing the same thing).

This could effectively cause memory leaks: while a thread was working on
the buffer list, other threads would allocate new buffers, increasing
the pool's total size. There was no real leak, but since these extra
buffers were not needed, but not free'd either (except when the buffer
pool was destroyed), this had the same effects as a real leak. For some
reason, growth was exponential, and could easily kill the process due
to OOM in real-world uses.

Fix this by using a mutex to protect the list operations. The fancy
way atomics remove the whole list to work on it is not needed anymore,
which also avoids the situation which was causing the leak.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Also add no-op fallbacks when threading is disabled.

This helps keeping the code clean if Libav is compiled for targets
without threading. Since we assume that no threads of any kind are used
in such configurations, doing nothing is ok by definition.

Based on a patch by wm4 <nfxjfg@googlemail.com>.

This reverts commit b9d08c77.

After taking MoveFileEx into use, we can replace files with renames
on windows as well.
Signed-off-by: Martin Storsjö <martin@martin.st>

This allows getting the normal unix semantics, where a rename
allows replacing an existing file.

Based on a suggestion by Reimar Döffinger.
Signed-off-by: Martin Storsjö <martin@martin.st>

This doesn't add any dependency on library internals, since this
only is a static inline function that gets built into each of the
calling functions - this is only to reduce the code duplication.
Signed-off-by: Martin Storsjö <martin@martin.st>

This allows setting the right fragment number if doing
random-access writing of fragments, and also allows reading the
current sequence number.
Signed-off-by: Martin Storsjö <martin@martin.st>

This allows creating a later mp4 fragment without sequentially
writing the earlier ones before (when called from a segmenter).

Normally when writing a fragmented mp4 file sequentially, the
first timestamps of a fragment are adjusted to match the
end of the previous fragment, to make sure the timestamp is the
same, even if it is calculated as the sum of previous fragment
durations. (And for the first packet in a file, the offset of
the first packet is written using an edit list.)

When writing an individual mp4 fragment discontinuously like this
(with potentially writing the earlier fragments separately later),
there's a risk of getting a gap in the timeline if the duration
field of the last packet in the previous fragment doesn't match up
with the start time of the next fragment.

Using this requires setting -avoid_negative_ts make_non_negative
(or -avoid_negative_ts 0).
Signed-off-by: Martin Storsjö <martin@martin.st>

This fixes "make checkheaders".
Signed-off-by: Martin Storsjö <martin@martin.st>

4775 decicycles -> 3688 decicycles

CC: libav-stable@libav.org
Bug-Id: CID 1135770 / CID 1135771

As done for all the other codecs not calling it indirectly.

CC: libav-stable@libav.org
Bug-Id: CID 1135770 / CID 1135771

`is_intra` is a 6bits bitfield.

CC: libav-stable@libav.org
Bug-Id: CID 1194380 / CID 1194381
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Keep the code as similar as possible across the codepaths to
ease spotting it for factorization.

Based on a patch from Michael Niedermayer <michaelni@gmx.at>.

The code currently set the information in at least 4 places, spare
some pointless loops.

Make the code in the loop a little uniform to make easier factorize
it out later.

CC: libav-stable@libav.org
Bug-Id: CID 1251347

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

CC: libav-stable@libav.org
Bug-Id: CID 1245699 / CID 1245700

This makes sure that the internal utf8 path names are handled
properly - the normal file handling functions assume path names
are in the native codepage, which isn't utf8.

This assumes that the tools outside of lavf don't use the mkdir
definition. (The tools don't do the same reading of command line
parameters as wchar either - they probably won't handle all possible
unicode file parameters properly, but at least work more predictably
if no utf8/wchar conversion is involved.)

This is moved further down in os_support.h, since windows.h shouldn't
be included before winsock2.h, while io.h needs to be included before
the manual defines for lseek functions.
Signed-off-by: Martin Storsjö <martin@martin.st>

On windows, rename(2) will fail if the target file exists. On
unix this trick is used to make sure that people reading the file
either will get the full previous file, or the full new version
of the file, but no intermediate version.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

This makes sure that segments actually start at a keyframe (and
makes sure we don't split segments twice in a row, with one segment
consisting of only a handful of packets), when one stream uses b-frames
while another one doesn't.
Signed-off-by: Martin Storsjö <martin@martin.st>

This fixes playback with dash.js, when the input is one separate
mp4 file per track.
Signed-off-by: Martin Storsjö <martin@martin.st>

Fixes a wordly warning from clang -Wsometimes-uninitialized.

Prevent NULL dereference.

CC: libav-stable@libav.org
Bug-Id: CID 703669
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

'ret' can only be used without initialization if s->height <= 0, which can
only happen if avctx->height <= 0, which is validated elsewhere. Doesn't hurt
to still initialize it though.

CC: libav-stable@libav.org
Bug-Id: CID 732296

At least 8 bytes are needed (Mono audio).

Bug-Id: CID 741418
CC: libav-stable@libav.org

Bug-Id: CID 1238993

Also move the check in the case it is actually used.

CC: libav-stable@libav.org
Bug-Id: CID 1087090

CC: libav-stable@libav.org
Bug-Id: CID 29261

CC: libav-stable@libav.org
Bug-Id: CID 700556 / CID 700557 / CID 700558

Don't write any bitrate attribute if it isn't known. As long as one
doesn't want automatic bitrate switching, playback can work just
fine even if it isn't set.

If strict standard compliance is requested, this is still considered
an error, since the attribute is mandatory according to the spec.

Based on a patch by Rodger Combs.
Signed-off-by: Martin Storsjö <martin@martin.st>

The same file already includes this header a few lines further
above.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

CC: libav-stable@libav.org
Bug-Id: CID 700555

And use a macro to make apparent why the value.

Bug-Id: CID 1108595

CC: libav-stable@libav.org
Bug-Id: CID 1198262