static int decode_tile(J2kDecoderContext *s, J2kTile *tile) { int compno, reslevelno, bandno; int x, y, *src[4]; uint8_t *line; J2kT1Context t1; for (compno = 0; compno < s->ncomponents; compno++){ J2kComponent *comp = tile->comp + compno; J2kCodingStyle *codsty = tile->codsty + compno; for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){ J2kResLevel *rlevel = comp->reslevel + reslevelno; for (bandno = 0; bandno < rlevel->nbands; bandno++){ J2kBand *band = rlevel->band + bandno; int cblkx, cblky, cblkno=0, xx0, x0, xx1, y0, yy0, yy1, bandpos; bandpos = bandno + (reslevelno > 0); yy0 = bandno == 0 ? 0 : comp->reslevel[reslevelno-1].coord[1][1] - comp->reslevel[reslevelno-1].coord[1][0]; y0 = yy0; yy1 = FFMIN(ff_j2k_ceildiv(band->coord[1][0] + 1, band->codeblock_height) * band->codeblock_height, band->coord[1][1]) - band->coord[1][0] + yy0; if (band->coord[0][0] == band->coord[0][1] || band->coord[1][0] == band->coord[1][1]) continue; for (cblky = 0; cblky < band->cblkny; cblky++){ if (reslevelno == 0 || bandno == 1) xx0 = 0; else xx0 = comp->reslevel[reslevelno-1].coord[0][1] - comp->reslevel[reslevelno-1].coord[0][0]; x0 = xx0; xx1 = FFMIN(ff_j2k_ceildiv(band->coord[0][0] + 1, band->codeblock_width) * band->codeblock_width, band->coord[0][1]) - band->coord[0][0] + xx0; for (cblkx = 0; cblkx < band->cblknx; cblkx++, cblkno++){ int y, x; decode_cblk(s, codsty, &t1, band->cblk + cblkno, xx1 - xx0, yy1 - yy0, bandpos); if (codsty->transform == FF_DWT53){ for (y = yy0; y < yy1; y+=s->cdy[compno]){ int *ptr = t1.data[y-yy0]; for (x = xx0; x < xx1; x+=s->cdx[compno]){ comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x] = *ptr++ >> 1; } } } else{ for (y = yy0; y < yy1; y+=s->cdy[compno]){ int *ptr = t1.data[y-yy0]; for (x = xx0; x < xx1; x+=s->cdx[compno]){ int tmp = ((int64_t)*ptr++) * ((int64_t)band->stepsize) >> 13, tmp2; tmp2 = FFABS(tmp>>1) + FFABS(tmp&1); comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x] = tmp < 0 ? -tmp2 : tmp2; } } } xx0 = xx1; xx1 = FFMIN(xx1 + band->codeblock_width, band->coord[0][1] - band->coord[0][0] + x0); } yy0 = yy1; yy1 = FFMIN(yy1 + band->codeblock_height, band->coord[1][1] - band->coord[1][0] + y0); } } } ff_j2k_dwt_decode(&comp->dwt, comp->data); src[compno] = comp->data; } if (tile->codsty[0].mct) mct_decode(s, tile); if (s->avctx->pix_fmt == PIX_FMT_BGRA) // RGBA -> BGRA FFSWAP(int *, src[0], src[2]); if (s->precision <= 8) { for (compno = 0; compno < s->ncomponents; compno++){ y = tile->comp[compno].coord[1][0] - s->image_offset_y; line = s->picture.data[0] + y * s->picture.linesize[0]; for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]){ uint8_t *dst; x = tile->comp[compno].coord[0][0] - s->image_offset_x; dst = line + x * s->ncomponents + compno; for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s->cdx[compno]) { *src[compno] += 1 << (s->cbps[compno]-1); if (*src[compno] < 0) *src[compno] = 0; else if (*src[compno] >= (1 << s->cbps[compno])) *src[compno] = (1 << s->cbps[compno]) - 1; *dst = *src[compno]++; dst += s->ncomponents; } line += s->picture.linesize[0]; } } } else { for (compno = 0; compno < s->ncomponents; compno++) { y = tile->comp[compno].coord[1][0] - s->image_offset_y; line = s->picture.data[0] + y * s->picture.linesize[0]; for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) { uint16_t *dst; x = tile->comp[compno].coord[0][0] - s->image_offset_x; dst = line + (x * s->ncomponents + compno) * 2; for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s-> cdx[compno]) { int32_t val; val = *src[compno]++ << (16 - s->cbps[compno]); val += 1 << 15; val = av_clip(val, 0, (1 << 16) - 1); *dst = val; dst += s->ncomponents; } line += s->picture.linesize[0]; } } } return 0; }