Snow uses the ratecontrol module, but does not expose a way to set
the rc_eq expression. The default expression, set in the ratecontrol
module, will always be used.
Make it possible to set rc_eq by adding an AVOption to snowenc.
The option definition is mostly a copy from the mpegvideo common
options definition of rc_eq (libavcodec/mpegvideo.h), with some
minor style adjustments to be closer to the other snowenc option
initializer expressions.
Signed-off-by: Alexander Strasser <eclipse7@gmx.net>
The new code is analog to how it's done in our mpegaudio parser.
Acked-by: Jun Zhao <barryjzhao@tencent.com>
Signed-off-by: Alexander Strasser <eclipse7@gmx.net>
Speedup from 275sec to 142sec
Testcase: 24426/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5639724379930624
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Fixes: out of array read
Fixes: 24487/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-5165847820369920
Fixes: 24636/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-5700973918683136
Fixes: 24683/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-6202883897556992
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This patch allows for selecting the progression order
in the j2k encoder. However, all components and resolution
levels will use the same progression order and will not
feature the use of progression order change markers.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Before c63c303a1f2b58677d480505ec93a90f77dd25b5 (the commit which
introduced a typedef for the type of the buffer of a PutBitContext)
skip_put_bits() was as follows:
static inline void skip_put_bits(PutBitContext *s, int n)
{
s->bit_left -= n;
s->buf_ptr -= 4 * (s->bit_left >> 5);
s->bit_left &= 31;
}
If s->bit_left was negative after the first subtraction, then the next
line will divide this by 32 with rounding towards -inf and multiply by
four; the result will be negative, of course.
The aforementioned commit changed this to:
static inline void skip_put_bits(PutBitContext *s, int n)
{
s->bit_left -= n;
s->buf_ptr -= sizeof(BitBuf) * ((unsigned)s->bit_left / BUF_BITS);
s->bit_left &= (BUF_BITS - 1);
}
Casting s->bit_left to unsigned meant that the rounding is still towards
-inf; yet the right side is now always positive (it transformed the
arithmetic shift into a logical shift), so that s->buf_ptr will always
be decremented (by about UINT_MAX / 8 unless n is huge) which leads to
segfaults on further usage and is already undefined pointer arithmetic
before that. This can be reproduced with the mpeg4 encoder with the
AV_CODEC_FLAG2_NO_OUTPUT flag set.
Furthermore, the earlier version as well as the new version share
another bug: s->bit_left will be in the range of 0..(BUF_BITS - 1)
afterwards, although the assumption throughout the other PutBitContext
functions is that it is in the range of 1..BUF_BITS. This might lead to
a shift by BUF_BITS in little-endian mode. This has been fixed, too.
The new version is furthermore able to skip zero bits, too.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Fixes: division by zero
Fixes: 24253/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-6250318007107584
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: -2147483648 * -1 cannot be represented in type 'int'
Fixes: 24011/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SNOW_fuzzer-5486376610168832
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
The default for the chromaoffset field in AVCodecContext
is zero, which until now always ended up overriding the
AVOption-set value, thus leading to the AVOption not working.
Additionally, the previous usage prevented the usage of
negative values, while both the variable as well as x264's
API would successfully handle such.
Thus, the default value of the AVOption is changed to match
the default of x264 (and what is currently the default for
the AVCodecContext chromaoffset field), and the checks are
changed to check for nonzero values.
This way:
1. the library default is still utilized if the value is zero.
2. both negative and positive values are correctly passed to
x264.
For historical context, this was initially similarly
implemented in 5764d38173661c29d954711dd5abfddf709e9ba4, and
then b340bd8a58c32453172404a8e4240e3317e341da broke the
value.
Partially reverts commit b340bd8a58c32453172404a8e4240e3317e341da.
Signed-off-by: Takio Yamaoka <y.takio@gmail.com>
Fixes: shift exponent 32 is too large for 32-bit type 'int'
Fixes: 24566/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-6033783737024512
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This patch allows the encoder to use SOP and EPH
markers. This would be useful as these markers
provide better error detection mechanisms.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Respecting the framerate in the libopenh264enc codec context.
Both the libx264 and libx265 encoders already contain similar logic
to first check the framerate before falling back to the timebase.
Reviewed-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
This differs from the MPEG specification as the actual real world
files do compute their CRC over variable areas and not the fixed
ones listed in the specification. This is also the reason for
the complexity of this code and the need to perform the CRC
check for layer2 in the middle of layer2 decoding.
Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
