diff options
Diffstat (limited to 'libswscale/utils.c')
| -rw-r--r-- | libswscale/utils.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/libswscale/utils.c b/libswscale/utils.c index c09d37d98a..b63ab190a6 100644 --- a/libswscale/utils.c +++ b/libswscale/utils.c @@ -612,14 +612,24 @@ static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos, if ((*filterPos)[i] + filterSize > srcW) { int shift = (*filterPos)[i] + FFMIN(filterSize - srcW, 0); + int64_t acc = 0; - // move filter coefficients right to compensate for filterPos - for (j = filterSize - 2; j >= 0; j--) { - int right = FFMIN(j + shift, filterSize - 1); - filter[i * filterSize + right] += filter[i * filterSize + j]; - filter[i * filterSize + j] = 0; + for (j = filterSize - 1; j >= 0; j--) { + if ((*filterPos)[i] + j >= srcW) { + acc += filter[i * filterSize + j]; + filter[i * filterSize + j] = 0; + } } + for (j = filterSize - 1; j >= 0; j--) { + if (j < shift) { + filter[i * filterSize + j] = 0; + } else { + filter[i * filterSize + j] = filter[i * filterSize + j - shift]; + } + } + (*filterPos)[i]-= shift; + filter[i * filterSize + srcW - 1 - (*filterPos)[i]] += acc; } } |