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avfilter/vf_waveform: optimize lowpass filter even more 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2016-03-29 15:00:45 +02:00
parent b73c27151e
commit 4a80a6ad21
1 changed files with 38 additions and 13 deletions
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51
libavfilter/vf_waveform.c
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@ -698,29 +698,54 @@ static av_always_inline void lowpass(WaveformContext *s,
uint8_t *dst = dst_line;
for (p = src_data; p < src_data_end; p++) {
int i = 0;
uint8_t *target;
if (column) {
do {
target = dst++ + dst_signed_linesize * *p;
update(target, max, intensity);
} while (++i < step);
target = dst + dst_signed_linesize * *p;
dst += step;
update(target, max, intensity);
} else {
uint8_t *row = dst_data;
do {
if (mirror)
target = row - *p - 1;
else
target = row + *p;
update(target, max, intensity);
row += dst_linesize;
} while (++i < step);
if (mirror)
target = row - *p - 1;
else
target = row + *p;
update(target, max, intensity);
row += dst_linesize;
}
}
src_data += src_linesize;
dst_data += dst_linesize * step;
}
if (column && step > 1) {
const int dst_w = s->display == PARADE ? out->width / s->acomp : out->width;
const int dst_h = 256;
uint8_t *dst;
int x, z;
dst = out->data[plane] + offset_y * dst_linesize + offset_x;
for (y = 0; y < dst_h; y++) {
for (x = 0; x < dst_w; x+=step) {
for (z = 1; z < step; z++) {
dst[x + z] = dst[x];
}
}
dst += dst_linesize;
}
} else if (step > 1) {
const int dst_h = s->display == PARADE ? out->height / s->acomp : out->height;
const int dst_w = 256;
uint8_t *dst;
int z;
dst = out->data[plane] + offset_y * dst_linesize + offset_x;
for (y = 0; y < dst_h; y+=step) {
for (z = 1; z < step; z++)
memcpy(dst + dst_linesize * z, dst, dst_w);
dst += dst_linesize * step;
}
}
envelope(s, out, plane, plane, column ? offset_x : offset_y);
}