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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-09-08 23:29:13 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-09-10 19:08:23 +0200 |
| commit | 981f04b2ae2d6e0355386aaff39840eb5d390a36 (patch) | |
| tree | 032c9b815e133f694c7ed61c7399a6a61eca1599 /libavcodec/scpr.c | |
| parent | cbe181c8e1611aaee2a85ab522e17b1322bdd4de (diff) | |
| download | ffmpeg-981f04b2ae2d6e0355386aaff39840eb5d390a36.tar.gz | |
avcodec/scpr: optimize shift loop.
Speeds code up from 50sec to 15sec
Fixes Timeout
Fixes: 3242/clusterfuzz-testcase-5811951672229888
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/scpr.c')
| -rw-r--r-- | libavcodec/scpr.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/libavcodec/scpr.c b/libavcodec/scpr.c index 37fbe7a106..cbe1bc40d9 100644 --- a/libavcodec/scpr.c +++ b/libavcodec/scpr.c @@ -826,8 +826,19 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, if (ret < 0) return ret; + // scale up each sample by 8 for (y = 0; y < avctx->height; y++) { - for (x = 0; x < avctx->width * 4; x++) { + // If the image is sufficiently aligned, compute 8 samples at once + if (!(((uintptr_t)dst) & 7)) { + uint64_t *dst64 = (uint64_t *)dst; + int w = avctx->width>>1; + for (x = 0; x < w; x++) { + dst64[x] = (dst64[x] << 3) & 0xFCFCFCFCFCFCFCFCULL; + } + x *= 8; + } else + x = 0; + for (; x < avctx->width * 4; x++) { dst[x] = dst[x] << 3; } dst += frame->linesize[0]; |