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21 Commits

Author SHA1 Message Date
Michael Niedermayer
a9fae76370 avcodec/gdv: Replace assert() checking bitstream by if() 
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2019-09-16 00:04:18 +02:00
Michael Niedermayer
5a6fc87443 avcodec/gdv: Check remaining output after decode 5/6/8/ 
Improves: Timeout (355sec -> 97sec)
Improves: 14709/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_GDV_fuzzer-5704215281795072

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
 2019-05-31 22:44:30 +02:00
Michael Niedermayer
f857753f56 avcodec/gdv: Check input palette size before rescale() 
Fixes: Timeout (22sec -> 11sec)
Fixes: 13576/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_GDV_fuzzer-5681024577568768

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2019-04-26 17:25:14 +02:00
Michael Niedermayer
5cf42f65b6 avcodec/gdv: Check for truncated tags in decompress_5() 
Testcase: 13169/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_GDV_fuzzer-5666354038833152

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2019-03-03 13:17:02 +01:00
Michael Niedermayer
6e23736aef avcodec/gdv: Optimize and factorize scaling loops 
Fixes: Timeout
Fixes: 11067/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_GDV_fuzzer-5686623711264768

Before change: Executed clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_GDV_fuzzer-5686623711264768 in 34386 ms
After  change: Executed clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_GDV_fuzzer-5686623711264768 in 24327 ms

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2019-01-14 17:16:55 +01:00
Michael Niedermayer
2d580d727c avcodec/gdv: Optimize unscaled loop 
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2019-01-05 22:36:12 +01:00
Michael Niedermayer
2076e11839 avcodec/gdv: Remove unused variable 
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2018-09-30 22:23:02 +02:00
Michael Niedermayer
35517e3ca7 avcodec/gdv: Error out if we had insufficent input for the output frame in decompress_2() 
Fixes: Timeout (with the previous commits to gdv.c)
Fixes: 9422/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_GDV_fuzzer-5143490001371136

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2018-09-28 01:25:17 +02:00
Michael Niedermayer
510bd61941 avcodec/gdv: Optimize 2x scaling loop a little in gdv_decode_frame() 
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2018-09-28 01:25:17 +02:00
Michael Niedermayer
6a4788e7b3 avcodec/gdv: Replace loop in gdv_decode_frame() by memcpy() 
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2018-09-28 01:25:17 +02:00
Michael Niedermayer
5f84fbce08 avcodec/gdv: Eliminate 50% of the reads in the first inner loop in rescale() 
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2018-09-28 01:25:17 +02:00
Michael Niedermayer
d021729efc avcodec/gdv: Simplify first inner loop in rescale() 
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2018-09-28 01:25:17 +02:00
Michael Niedermayer
6228ce0a33 avcodec/gdv: Combine first and 3rd case in rescale() 
Simplifies code

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2018-09-28 01:25:17 +02:00
Michael Niedermayer
a423970511 avcodec/gdv: Factor terms out of inner loops in rescale() 
This also replaces some loops by memcpy()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2018-09-28 01:25:17 +02:00
Michael Niedermayer
b90d8cc746 avcodec/gdv: Replace divisions by shifts in rescale() 
Divisions tend to be slower than shifts unless the compiler optimizes them out.
And some of these are in inner loops.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2018-09-28 01:25:17 +02:00
Michael Niedermayer
cf5a6c754a avcodec/gdv: Check compression before allocating frame 
Fixes: 2926/clusterfuzz-testcase-4987110014582784

This reduces decoding time from 7 to 4 seconds

The timeout should have been fixed in 0561bd2fc2 but ossfuzz did not close this issue

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2017-11-03 00:56:30 +01:00
Michael Niedermayer
0561bd2fc2 avcodec/gdv: Check available space before reading palette 
Fixes: Timeout
Fixes: 2926/clusterfuzz-testcase-498711001458278

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2017-08-11 19:27:52 +02:00
Paul B Mahol
4d681269e0 avcodec/gdv: add decompression for 2 and 5 method 
Signed-off-by: Paul B Mahol <onemda@gmail.com>
 2017-06-29 15:54:20 +02:00
Michael Niedermayer
9b65dbf734 avcodec/gdv: Fix undefined shift 
Fixes: runtime error: left shift of 255 by 24 places cannot be represented in type 'int'
Fixes: 2249/clusterfuzz-testcase-minimized-5388542379294720

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
 2017-06-16 23:32:28 +02:00
Paul B Mahol
9a949cdf8f avcodec/gdv: fix compiler warnings 
Signed-off-by: Paul B Mahol <onemda@gmail.com>
 2017-06-11 10:26:18 +02:00
Paul B Mahol
d1c08027d8 avcodec: add Gremlin Digital Video decoder 
Signed-off-by: Paul B Mahol <onemda@gmail.com>
 2017-06-11 10:00:39 +02:00