[FFmpeg-cvslog] avcodec/scpr: optimize shift loop.

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Fri Sep  8 23:29:13 2017 +0200| [b590758298cc6f7bac710ebaecb99a4de878c7f8] | committer: Michael Niedermayer

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 at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 981f04b2ae2d6e0355386aaff39840eb5d390a36)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b590758298cc6f7bac710ebaecb99a4de878c7f8
---

 libavcodec/scpr.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/libavcodec/scpr.c b/libavcodec/scpr.c
index b4cc7df07f..78a6d5c0cd 100644
--- a/libavcodec/scpr.c
+++ b/libavcodec/scpr.c
@@ -824,8 +824,19 @@ 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];