diff options
Diffstat (limited to 'libavcodec/dvbsubdec.c')
| -rw-r--r-- | libavcodec/dvbsubdec.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/libavcodec/dvbsubdec.c b/libavcodec/dvbsubdec.c index e268e2a38e..9f59b7259f 100644 --- a/libavcodec/dvbsubdec.c +++ b/libavcodec/dvbsubdec.c @@ -754,6 +754,63 @@ static int dvbsub_read_8bit_string(AVCodecContext *avctx, return pixels_read; } +static void compute_default_clut(AVPicture *frame, int w, int h) +{ + uint8_t list[256] = {0}; + uint8_t list_inv[256]; + int counttab[256] = {0}; + int count, i, x, y; + +#define V(x,y) frame->data[0][(x) + (y)*frame->linesize[0]] + for (y = 0; y<h; y++) { + for (x = 0; x<w; x++) { + int v = V(x,y) + 1; + int vl = x ? V(x-1,y) + 1 : 0; + int vr = x+1<w ? V(x+1,y) + 1 : 0; + int vt = y ? V(x,y-1) + 1 : 0; + int vb = y+1<h ? V(x,y+1) + 1 : 0; + counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb)); + } + } +#define L(x,y) list[ frame->data[0][(x) + (y)*frame->linesize[0]] ] + + for (i = 0; i<256; i++) { + int scoretab[256] = {0}; + int bestscore = 0; + int bestv = 0; + for (y = 0; y<h; y++) { + for (x = 0; x<w; x++) { + int v = frame->data[0][x + y*frame->linesize[0]]; + int l_m = list[v]; + int l_l = x ? L(x-1, y) : 1; + int l_r = x+1<w ? L(x+1, y) : 1; + int l_t = y ? L(x, y-1) : 1; + int l_b = y+1<h ? L(x, y+1) : 1; + int score; + if (l_m) + continue; + scoretab[v] += l_l + l_r + l_t + l_b; + score = 1024LL*scoretab[v] / counttab[v]; + if (score > bestscore) { + bestscore = score; + bestv = v; + } + } + } + if (!bestscore) + break; + list [ bestv ] = 1; + list_inv[ i ] = bestv; + } + + count = i - 1; + for (i--; i>=0; i--) { + int v = i*255/count; + AV_WN32(frame->data[1] + 4*list_inv[i], RGBA(v/2,v,v/2,v)); + } +} + + static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output) { DVBSubContext *ctx = avctx->priv_data; @@ -855,6 +912,9 @@ static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_ou memcpy(rect->pict.data[0], region->pbuf, region->buf_size); + if (clut == &default_clut) + compute_default_clut(&rect->pict, rect->w, rect->h); + i++; } } |