It involves less allocations and therefore has the nice property
that deriving a reference from a reference can't fail.
This allows for considerable simplifications in
ff_h264_(ref|replace)_picture().
Switching to the RefStruct API also allows to make H264Picture
smaller, because some AVBufferRef* pointers could be removed
without replacement.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Very similar to the AVBufferPool API, but with some differences:
1. Reusing an already existing entry does not incur an allocation
at all any more (the AVBufferPool API needs to allocate an AVBufferRef).
2. The tasks done while holding the lock are smaller; e.g.
allocating new entries is now performed without holding the lock.
The same goes for freeing.
3. The entries are freed as soon as possible (the AVBufferPool API
frees them in two batches: The first in av_buffer_pool_uninit() and
the second immediately before the pool is freed when the last
outstanding entry is returned to the pool).
4. The API is designed for objects and not naked buffers and
therefore has a reset callback. This is called whenever an object
is returned to the pool.
5. Just like with the RefStruct API, custom allocators are not
supported.
(If desired, the FFRefStructPool struct itself could be made
reference counted via the RefStruct API; an FFRefStructPool
would then be freed via ff_refstruct_unref().)
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This makes the code more testable as uninitialized fields are 0
and not random values from the last call
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
These entries do not correspond to VLC symbols that can be used
they do corrupt various variables like min/max bits
This also no longer assumes that there is a single non subtable
entry
Probably fixes some infinite loops too
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Fixes: shift exponent 32 is too large for 32-bit type 'int'
Fixes: 63151/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5067531154751488
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Fixes: signed integer overflow: 1900031961 + 553590817 cannot be represented in type 'int'
Fixes: 63061/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5166188298371072
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Fixes: Assertion failure in mov_read_iloc( in mov_read_iloc())
Fixes: 62866/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5282997370486784
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
The check is based on not infinite looping. It is likely
a more strict check can be done
Fixes: Infinite loop
Fixes: 62473/clusterfuzz-testcase-minimized-ffmpeg_BSF_EVC_FRAME_MERGE_fuzzer-5719883750703104
Fixes: 62765/clusterfuzz-testcase-minimized-ffmpeg_dem_EVC_fuzzer-6448531252314112
Fixes: 63378/clusterfuzz-testcase-minimized-ffmpeg_dem_MPEGPS_fuzzer-6504993844494336
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: "Dawid Kozinski/Multimedia (PLT) /SRPOL/Staff Engineer/Samsung Electronics" <d.kozinski@samsung.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying table directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
For all VLCs here, the number of bits of the VLC is write-only,
because it is hardcoded at the call site. Therefore one can replace
these VLC structures with the only thing that is actually used:
The pointer to the VLCElem table. And in most cases one can even
avoid this.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying tables directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
For some VLCs here, the number of bits of the VLC is
write-only, because it is hardcoded at the call site.
Therefore one can replace these VLC structures with
the only thing that is actually used: The pointer
to the VLCElem table.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This allows to avoid the relocations inherent in an array
to individual tables; it also reduces padding.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
For all VLCs here, the number of bits of the VLC is
write-only, because it is hardcoded at the call site.
Therefore one can replace these VLC structures with
the only thing that is actually used: The pointer
to the VLCElem table.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
ff_ps_init() initializes some tables for AAC parametric stereo
and some of them are only valid for the fixed- or floating-point
decoder, whereas others (namely VLCs) are valid for both.
The latter are therefore initialized by ff_ps_init_common()
and because the two versions of ff_ps_init() can be run
concurrently, it is guarded by an AVOnce.
Yet now that there is ff_aacdec_common_init_once() there is
a better way to do this: Call ff_ps_init_common()
from ff_aacdec_common_init_once(). That way there is no need
to guard ff_ps_init_common() by an AVOnce any more.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This allows to avoid the relocations inherent in a table
to individual tables; it also reduces padding.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
It allows to replace code tables of type uint32_t or uint16_t
by symbols of type uint8_t. It is also faster.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
For all VLCs here, the number of bits of the VLC is
write-only, because it is hardcoded at the call site.
Therefore one can replace these VLC structures with
the only thing that is actually used: The pointer
to the VLCElem table.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
The VLCs, their init code and the tables used for initialization
are currently duplicated for the floating- and fixed-point decoders.
This commit stops doing so and moves this stuff to aacdec_common.c.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
For all VLCs here, the number of bits of the VLC is
write-only, because it is hardcoded at the call site.
Therefore one can replace these VLC structures with
the only thing that is actually used: The pointer
to the VLCElem table. And in some cases one can even
avoid this.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Due to making the decode frames context use the coded size, the
filter started to display those artifacts as it reused the input frame's size.
Change it to instead output the real image size for images, not the input.
h->long_ref isn't guaranteed to be contiguously filled. Use the approach
from both vaapi_h264 and vdpau_h264 which goes through the 16 frames in
h->long_ref to find the LTR entries.
Fixes MR2_MW_A.264 from JVT-AVC_V1.
The fixed-point decoder actually does not use the floating-point
tables initialized by ff_aac_tableinit() at all. So don't
initialize them for it; instead merge initializing these tables
into ff_aac_float_common_init() which is already the function
for the common static initializations of the floating-point
AAC decoder and the (also floating-point) AAC encoder.
Doing so saves also one AVOnce.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
They (as well as their init code) are currently duplicated
for the floating- and fixed-point decoders.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
For all VLCs here, the number of bits of the VLC is write-only,
because it is hardcoded at the call site. Therefore one can replace
these VLC structures with the only thing that is actually used:
The pointer to the VLCElem table. And in some cases one can even
avoid this.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
For all VLCs here, the number of bits of the VLC is
write-only, because it is hardcoded at the call site.
Therefore one can replace these VLC structures with
the only thing that is actually used: The pointer
to the VLCElem table. And in some cases one can even
avoid this.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying table directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying table directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
For all VLCs here, the number of bits of the VLC is
write-only, because it is hardcoded at the call site.
Therefore one can replace these VLC structures with
the only thing that is actually used: The pointer
to the VLCElem table. And in some cases one can even
avoid this.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying table directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying table directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying table directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying table directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Everything besides VLC.table is basically write-only
and only VLC.table needs to be retained.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying table directly.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Andreas Rheinhardt
Rémi Denis-Courmont
Michael Niedermayer
Lynne
Benjamin Cheng