This merges several byte operations and avoids some shifts inside the loop Improves: Timeout (330sec -> 134sec) Improves: 15599/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MSZH_fuzzer-5658127116009472
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavcodec/lcldec.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/libavcodec/lcldec.c b/libavcodec/lcldec.c index 104defa5f5..c3787b3cbe 100644 --- a/libavcodec/lcldec.c +++ b/libavcodec/lcldec.c @@ -391,13 +391,13 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPac break; case IMGTYPE_YUV422: for (row = 0; row < height; row++) { - for (col = 0; col < width - 3; col += 4) { + for (col = 0; col < (width - 2)>>1; col += 2) { memcpy(y_out + col, encoded, 4); encoded += 4; - u_out[ col >> 1 ] = *encoded++ + 128; - u_out[(col >> 1) + 1] = *encoded++ + 128; - v_out[ col >> 1 ] = *encoded++ + 128; - v_out[(col >> 1) + 1] = *encoded++ + 128; + AV_WN16(u_out + col, AV_RN16(encoded) ^ 0x8080); + encoded += 2; + AV_WN16(v_out + col, AV_RN16(encoded) ^ 0x8080); + encoded += 2; } y_out -= frame->linesize[0]; u_out -= frame->linesize[1]; -- 2.22.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
