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Code Issues Releases Activity

avfilter/vf_showinfo: also calculate and show mean and standard deviation

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Fixes Ticket3013

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-05-03 06:02:42 +02:00
parent 719e72c971
commit 09725c1d2b
1 changed files with 23 additions and 1 deletions
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24
libavfilter/vf_showinfo.c
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@ -65,11 +65,23 @@ static void dump_stereo3d(AVFilterContext *ctx, AVFrameSideData *sd)
av_log(ctx, AV_LOG_INFO, " (inverted)");
}
static void update_sample_stats(const uint8_t *src, int len, int64_t *sum, int64_t *sum2)
{
int i;
for (i = 0; i < len; i++) {
*sum += src[i];
*sum2 += src[i] * src[i];
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
uint32_t plane_checksum[4] = {0}, checksum = 0;
int64_t sum[4] = {0}, sum2[4] = {0};
int32_t pixelcount[4] = {0};
int i, plane, vsub = desc->log2_chroma_h;
for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
@ -83,6 +95,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
for (i = 0; i < h; i++) {
plane_checksum[plane] = av_adler32_update(plane_checksum[plane], data, linesize);
checksum = av_adler32_update(checksum, data, linesize);
update_sample_stats(data, linesize, sum+plane, sum2+plane);
pixelcount[plane] += linesize;
data += frame->linesize[plane];
}
}
@ -104,7 +119,14 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
for (plane = 1; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++)
av_log(ctx, AV_LOG_INFO, " %08"PRIX32, plane_checksum[plane]);
av_log(ctx, AV_LOG_INFO, "]\n");
av_log(ctx, AV_LOG_INFO, "] mean:[");
for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++)
av_log(ctx, AV_LOG_INFO, "%"PRId64" ", (sum[plane] + pixelcount[plane]/2) / pixelcount[plane]);
av_log(ctx, AV_LOG_INFO, "\b] stdev:[");
for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++)
av_log(ctx, AV_LOG_INFO, "%3.1f ",
sqrt((sum2[plane] - sum[plane]*(double)sum[plane]/pixelcount[plane])/pixelcount[plane]));
av_log(ctx, AV_LOG_INFO, "\b]\n");
for (i = 0; i < frame->nb_side_data; i++) {
AVFrameSideData *sd = frame->side_data[i];