const int t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
const int t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
const int t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
- const int t4 = 5793 * (t2 + t0 + 0x800 >> 12);
- const int t5 = 5793 * (t3 + t1 + 0x800 >> 12);
- const int t6 = t2 - t0;
- const int t7 = t3 - t1;
- const int t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
- const int t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
- const int tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd;
- const int tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd;
- blk[0 * step] = ( t4 + t9 + tB) >> shift;
- blk[1 * step] = ( t6 + t7 + t8 + tA) >> shift;
- blk[2 * step] = ( t6 - t7 - t8 + tA) >> shift;
- blk[3 * step] = ( t5 - t9 + tB) >> shift;
- blk[4 * step] = ( -t5 - t9 + tB) >> shift;
- blk[5 * step] = (-(t6 - t7) - t8 + tA) >> shift;
- blk[6 * step] = (-(t6 + t7) + t8 + tA) >> shift;
- blk[7 * step] = ( -t4 + t9 + tB) >> shift;
+ const unsigned t4 = 5793U * (t2 + t0 + 0x800 >> 12);
+ const unsigned t5 = 5793U * (t3 + t1 + 0x800 >> 12);
+ const unsigned t6 = t2 - t0;
+ const unsigned t7 = t3 - t1;
+ const unsigned t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
+ const unsigned t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
+ const unsigned tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd;
+ const unsigned tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd;
+ blk[0 * step] = (int)( t4 + t9 + tB) >> shift;
+ blk[1 * step] = (int)( t6 + t7 + t8 + tA) >> shift;
+ blk[2 * step] = (int)( t6 - t7 - t8 + tA) >> shift;
+ blk[3 * step] = (int)( t5 - t9 + tB) >> shift;
+ blk[4 * step] = (int)( -t5 - t9 + tB) >> shift;
+ blk[5 * step] = (int)(-(t6 - t7) - t8 + tA) >> shift;
+ blk[6 * step] = (int)(-(t6 + t7) + t8 + tA) >> shift;
+ blk[7 * step] = (int)( -t4 + t9 + tB) >> shift;
}
static void fic_idct_put(uint8_t *dst, int stride, int16_t *block)
if (num_coeff > 64)
return AVERROR_INVALIDDATA;
- for (i = 0; i < num_coeff; i++)
- block[ff_zigzag_direct[i]] = get_se_golomb(gb) *
+ for (i = 0; i < num_coeff; i++) {
+ int v = get_se_golomb(gb);
+ if (v < -2048 || v > 2048)
+ return AVERROR_INVALIDDATA;
+ block[ff_zigzag_direct[i]] = v *
ctx->qmat[ff_zigzag_direct[i]];
+ }
fic_idct_put(dst, stride, block);