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lavfi/showwaves: fix crash in case of negative linesize 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-04-29 13:36:59 +00:00
parent 32d4641219
commit c645659988
1 changed files with 2 additions and 1 deletions
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3
libavfilter/avf_showwaves.c
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@ -188,7 +188,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
(AVRational){ 1, inlink->sample_rate },
outlink->time_base);
linesize = outpicref->linesize[0];
memset(outpicref->data[0], 0, showwaves->h*linesize);
for (j = 0; j < outlink->h; j++)
memset(outpicref->data[0] + j * linesize, 0, outlink->w);
}
for (j = 0; j < nb_channels; j++) {
h = showwaves->h/2 - av_rescale(*p++, showwaves->h/2, MAX_INT16);