int ff_init_filters(SwsContext * c) { int i; int index; int num_ydesc; int num_cdesc; int num_vdesc = isPlanarYUV(c->dstFormat) && !isGray(c->dstFormat) ? 2 : 1; int need_lum_conv = c->lumToYV12 || c->readLumPlanar || c->alpToYV12 || c->readAlpPlanar; int need_chr_conv = c->chrToYV12 || c->readChrPlanar; int srcIdx, dstIdx; int dst_stride = FFALIGN(c->dstW * sizeof(int16_t) + 66, 16); uint32_t * pal = usePal(c->srcFormat) ? c->pal_yuv : (uint32_t*)c->input_rgb2yuv_table; int res = 0; if (c->dstBpc == 16) dst_stride <<= 1; num_ydesc = need_lum_conv ? 2 : 1; num_cdesc = need_chr_conv ? 2 : 1; c->numSlice = FFMAX(num_ydesc, num_cdesc) + 2; c->numDesc = num_ydesc + num_cdesc + num_vdesc; c->descIndex[0] = num_ydesc; c->descIndex[1] = num_ydesc + num_cdesc; c->desc = av_mallocz_array(sizeof(SwsFilterDescriptor), c->numDesc); if (!c->desc) return AVERROR(ENOMEM); c->slice = av_mallocz_array(sizeof(SwsSlice), c->numSlice); res = alloc_slice(&c->slice[0], c->srcFormat, c->srcH, c->chrSrcH, c->chrSrcHSubSample, c->chrSrcVSubSample, 0); if (res < 0) goto cleanup; for (i = 1; i < c->numSlice-2; ++i) { res = alloc_slice(&c->slice[i], c->srcFormat, c->vLumFilterSize + MAX_LINES_AHEAD, c->vChrFilterSize + MAX_LINES_AHEAD, c->chrSrcHSubSample, c->chrSrcVSubSample, 0); if (res < 0) goto cleanup; res = alloc_lines(&c->slice[i], FFALIGN(c->srcW*2+78, 16), c->srcW); if (res < 0) goto cleanup; } // horizontal scaler output res = alloc_slice(&c->slice[i], c->srcFormat, c->vLumFilterSize + MAX_LINES_AHEAD, c->vChrFilterSize + MAX_LINES_AHEAD, c->chrDstHSubSample, c->chrDstVSubSample, 1); if (res < 0) goto cleanup; res = alloc_lines(&c->slice[i], dst_stride, c->dstW); if (res < 0) goto cleanup; fill_ones(&c->slice[i], dst_stride>>1, c->dstBpc == 16); // vertical scaler output ++i; res = alloc_slice(&c->slice[i], c->dstFormat, c->dstH, c->chrDstH, c->chrDstHSubSample, c->chrDstVSubSample, 0); if (res < 0) goto cleanup; index = 0; srcIdx = 0; dstIdx = 1; if (need_lum_conv) { ff_init_desc_fmt_convert(&c->desc[index], &c->slice[srcIdx], &c->slice[dstIdx], pal); c->desc[index].alpha = c->alpPixBuf != 0; ++index; srcIdx = dstIdx; } dstIdx = FFMAX(num_ydesc, num_cdesc); ff_init_desc_hscale(&c->desc[index], &c->slice[index], &c->slice[dstIdx], c->hLumFilter, c->hLumFilterPos, c->hLumFilterSize, c->lumXInc); c->desc[index].alpha = c->alpPixBuf != 0; ++index; { srcIdx = 0; dstIdx = 1; if (need_chr_conv) { ff_init_desc_cfmt_convert(&c->desc[index], &c->slice[srcIdx], &c->slice[dstIdx], pal); ++index; srcIdx = dstIdx; } dstIdx = FFMAX(num_ydesc, num_cdesc); if (c->needs_hcscale) ff_init_desc_chscale(&c->desc[index], &c->slice[srcIdx], &c->slice[dstIdx], c->hChrFilter, c->hChrFilterPos, c->hChrFilterSize, c->chrXInc); else ff_init_desc_no_chr(&c->desc[index], &c->slice[srcIdx], &c->slice[dstIdx]); } ++index; { srcIdx = c->numSlice - 2; dstIdx = c->numSlice - 1; ff_init_vscale(c, c->desc + index, c->slice + srcIdx, c->slice + dstIdx); } return 0; cleanup: ff_free_filters(c); return res; }