Resetting a dynamic buffer means to keep the AVIOContext and the
internal buffer used by the dynamic buffer. This is done in order to
save (re)allocations when one has a workflow where one opens and closes
dynamic buffers in sequence.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Up until now, the Matroska muxer would allocate a structure containing
three members: The segment offset, a pointer to an array containing Cue
(index) entries and a counter for said array. It is unnecessary to
allocate it separately and it is unnecessary to contain the segment
offset in said structure, as it duplicates another field contained in
the MatroskaMuxContext. This commit implements the corresponding
changes.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
When writing the SeekHead (a form of index) at the end of the muxing
process, mkv_write_seekhead() would first seek to the position where the
SeekHead ought to be written, then write it there and seek back to the
original position afterwards. Which means: To the end of the file.
Afterwards, a seek to the beginning of the file is performed to update
further values. This of course means that the second seek in
mkv_write_seekhead() was unnecessary.
This has been changed: A new parameter was added to mkv_write_seekhead()
containing the destination for the second seek, effectively eliminating
the seek to the end of the file after writing the SeekHead.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
mkv_write_seekhead() would up until now try to seek to the position where
the SeekHead ought to be written, write the SeekHead and seek back. The
first of these seeks was checked as was writing, yet the seek back was
unchecked. Moreover the return value of mkv_write_seekhead() was unchecked
(the ordinary return value was the position where the SeekHead was written).
This commit changes this: Everything is checked. In the unseekable case
(where the first seek may nevertheless work when it happens in the buffer)
a failure at the first seek is not considered an error. In any case,
failure to seek back is an error.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
When the Matroska muxer writes an EBML ID, it calculates the length of
said ID before; and it does this as if this were a number that needs to
be encoded as EBML number: The formula used is (av_log2(id + 1) - 1) / 7
+ 1. But the constants used already contain the VINT_MARKER (the leading
bit indicating the length of the EBML number) and therefore the algorithm
used makes no sense. Instead the position of the most significant byte
set gives the desired length.
The algorithm used until now worked because EBML numbers are subject to
restrictions: If the EBML number takes up k bytes, then the bit 1 << (7
* k) is set and av_log2(id) is 7 * k. So the current algorithm produces
the correct result unless the EBML ID is of the form 7 * k - 1 because
of the "id + 1". But contrary to encoding lengths as EBML number (where
the + 1 exists to avoid the encodings reserved for unknown length),
such EBML numbers are simply forbidden as EBML IDs and as such none of
them were ever written.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit updates the documentation of av_read_frame() to match its
actual behaviour in several ways:
1. On success, av_read_frame() always returns refcounted packets.
2. It can handle uninitialized packets.
3. On error, it always returns blank packets.
This will allow callers to not initialize or unref unnecessarily.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Since commit e134c203 strdups of several elements of a manifest are kept
in the DASHContext; but said commit completely forgot to free these
strings again (with xmlFree()). Given that these strings are never used
at all, this commit closes this leak by reverting said commit.
This reverts commit e134c20374.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Up until now, it was completely unspecified what the content of the
destination packet dst was on error. Depending upon where the error
happened calling av_packet_unref() on dst might be dangerous.
This commit changes this by making sure that dst is blank on error, so
unreferencing it again is safe (and still pointless). This behaviour is
documented.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
av_packet_ref() mostly treated the destination packet dst as uninitialized,
i.e. the destination fields were simply overwritten. But if the source
packet was not reference-counted, dst->buf was treated as if it pointed
to an already allocated buffer (if != NULL) to be reallocated to the
desired size.
The documentation did not explicitly state whether the dst will be treated
as uninitialized, but it stated that if the source packet is not refcounted,
a new buffer in dst will be allocated. This and the fact that the side-data
as well as the codepath taken in case src is refcounted always treated the
packet as uninitialized means that dst should always be treated as
uninitialized for the sake of consistency. And this behaviour has been
explicitly documented.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Validate the value of ST field in the TLM marker of JPEG2000.
Throw an error when ST takes value of 0b11.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
The specifications are de-facto frozen now as they've already been used in
production for years, the author has indicated reluctance on IRC to change
it further, and the only potential changes would, from what I understand,
be forward-compatible.
Add overflow test for hevc_add_res when int16_t coeff = -32768.
The result of C is good, while ASM is not.
To verify:
make fate-checkasm-hevc_add_res
ffmpeg/tests/checkasm/checkasm --test=hevc_add_res
./checkasm --test=hevc_add_res
checkasm: using random seed 679391863
MMXEXT:
hevc_add_res_4x4_8_mmxext (hevc_add_res.c:69)
- hevc_add_res.add_residual [FAILED]
SSE2:
hevc_add_res_8x8_8_sse2 (hevc_add_res.c:69)
hevc_add_res_16x16_8_sse2 (hevc_add_res.c:69)
hevc_add_res_32x32_8_sse2 (hevc_add_res.c:69)
- hevc_add_res.add_residual [FAILED]
AVX:
hevc_add_res_8x8_8_avx (hevc_add_res.c:69)
hevc_add_res_16x16_8_avx (hevc_add_res.c:69)
hevc_add_res_32x32_8_avx (hevc_add_res.c:69)
- hevc_add_res.add_residual [FAILED]
AVX2:
hevc_add_res_32x32_8_avx2 (hevc_add_res.c:69)
- hevc_add_res.add_residual [FAILED]
checkasm: 8 of 14 tests have failed
Signed-off-by: Xu Guangxin <guangxin.xu@intel.com>
Signed-off-by: Linjie Fu <linjie.fu@intel.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
check_func will return NULL for functions that have already been tested. If
the func is tested and skipped (which happens several times), there is no
need to prepare data(randomize_buffers and memcpy).
Move relative code in compare_add_res(), prepare data and do check only if
the function is not tested.
Signed-off-by: Linjie Fu <linjie.fu@intel.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Resolution/format changes lead to re-initialization of hardware
accelerations(vaapi/dxva2/..) with new hwaccel_priv_data in
the worker-thread. But hwaccel_priv_data in user context won't
be updated until the resolution changing frame is output.
A termination with "-vframes" just after the reinit will lead to:
1. memory leak in worker-thread.
2. double free in user-thread.
Update user context in ff_frame_thread_free with the last thread
submit_packet() was called on.
To reproduce:
ffmpeg -hwaccel vaapi(dxva2) -v verbose -i
fate-suite/h264/reinit-large_420_8-to-small_420_8.h264 -pix_fmt nv12
-f rawvideo -vsync passthrough -vframes 47 -y out.yuv
Signed-off-by: Linjie Fu <linjie.fu@intel.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
The comments for some of the markers were incorrect.
This patch fixes the comments associated with the markers.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
The classical ptr = av_realloc(ptr, size).
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Also return 0 after successfully reading a packet.
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Also simply return 0 in case a packet has been successfully read.
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Increasing it by 2048 entries per realloc is exessive.
Reduces memory usage, especially on long, non fragmented output.
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: James Almer <jamrial@gmail.com>
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>
This fixes memleaks if an error happens after one of the allocations
in init; or if the trailer isn't written (e.g. because there was an
error when writing a packet).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
