diff options
Diffstat (limited to 'libavutil/tx.c')
| -rw-r--r-- | libavutil/tx.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/libavutil/tx.c b/libavutil/tx.c index 3b0568a5e1..49d5e125ae 100644 --- a/libavutil/tx.c +++ b/libavutil/tx.c @@ -107,6 +107,42 @@ int ff_tx_gen_ptwo_revtab(AVTXContext *s) return 0; } +int ff_tx_gen_ptwo_inplace_revtab_idx(AVTXContext *s) +{ + int nb_inplace_idx = 0; + + if (!(s->inplace_idx = av_malloc(s->m*sizeof(*s->inplace_idx)))) + return AVERROR(ENOMEM); + + for (int d = 1; d < s->m; d++) { + int src = d; + int dst = s->revtab[src]; + + if (dst <= src) + continue; + + int found = 0; + int start_src = src; + do { + src = dst; + for (int j = 0; j < nb_inplace_idx; j++) { + if (dst == s->inplace_idx[j]) { + found = 1; + break; + } + } + dst = s->revtab[dst]; + } while (dst != start_src && !found); + + if (!found) + s->inplace_idx[nb_inplace_idx++] = start_src; + } + + s->inplace_idx[nb_inplace_idx++] = 0; + + return 0; +} + av_cold void av_tx_uninit(AVTXContext **ctx) { if (!(*ctx)) @@ -115,6 +151,7 @@ av_cold void av_tx_uninit(AVTXContext **ctx) av_free((*ctx)->pfatab); av_free((*ctx)->exptab); av_free((*ctx)->revtab); + av_free((*ctx)->inplace_idx); av_free((*ctx)->tmp); av_freep(ctx); |