static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst, int stride, uint8_t *src, uint8_t *ref) { uint8_t *code, *data, *mv, *msk, *tmp, *tmp2; int i, j, k; int type, x, y, d, d2; uint32_t mask; code = src + 12; data = code + ((avctx->width * avctx->height) >> 4); mv = data + AV_RB32(src + 0); msk = mv + AV_RB32(src + 4); for(j = 0; j < avctx->height; j += 4){ for(i = 0; i < avctx->width; i += 4){ tmp = dst + i; tmp2 = ref + i; type = *code++; switch(type){ case 4: // motion compensation x = (*mv) >> 4; if(x & 8) x = 8 - x; y = (*mv++) & 0xF; if(y & 8) y = 8 - y; if (i < -x || avctx->width - i - 4 < x || j < -y || avctx->height - j - 4 < y) { av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y); return AVERROR_INVALIDDATA; } tmp2 += x + y*stride; case 0: // skip case 5: // skip in method 12 for(y = 0; y < 4; y++){ memcpy(tmp, tmp2, 4); tmp += stride; tmp2 += stride; } break; case 1: // masked change case 10: // masked change with only half of pixels changed case 11: // cases 10-15 are for method 12 only case 12: case 13: case 14: case 15: if(type == 1){ mask = AV_RB16(msk); msk += 2; }else{ type -= 10; mask = ((msk[0] & 0xF0) << shift1[type]) | ((msk[0] & 0xF) << shift2[type]); msk++; } for(y = 0; y < 4; y++){ for(x = 0; x < 4; x++){ tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x]; mask <<= 1; } tmp += stride; tmp2 += stride; } break; case 2: // fill block for(y = 0; y < 4; y++){ memset(tmp, data[0], 4); tmp += stride; } data++; break; case 3: // raw block for(y = 0; y < 4; y++){ memcpy(tmp, data, 4); data += 4; tmp += stride; } break; case 8: // subblocks - method 13 only mask = *msk++; for(k = 0; k < 4; k++){ d = ((k & 1) << 1) + ((k & 2) * stride); d2 = ((k & 1) << 1) + ((k & 2) * stride); tmp2 = ref + i + d2; switch(mask & 0xC0){ case 0x80: // motion compensation x = (*mv) >> 4; if(x & 8) x = 8 - x; y = (*mv++) & 0xF; if(y & 8) y = 8 - y; if (i + 2*(k & 1) < -x || avctx->width - i - 2*(k & 1) - 2 < x || j + (k & 2) < -y || avctx->height - j - (k & 2) - 2 < y) { av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y); return AVERROR_INVALIDDATA; } tmp2 += x + y*stride; case 0x00: // skip tmp[d + 0 ] = tmp2[0]; tmp[d + 1 ] = tmp2[1]; tmp[d + 0 + stride] = tmp2[0 + stride]; tmp[d + 1 + stride] = tmp2[1 + stride]; break; case 0x40: // fill tmp[d + 0 ] = data[0]; tmp[d + 1 ] = data[0]; tmp[d + 0 + stride] = data[0]; tmp[d + 1 + stride] = data[0]; data++; break; case 0xC0: // raw tmp[d + 0 ] = *data++; tmp[d + 1 ] = *data++; tmp[d + 0 + stride] = *data++; tmp[d + 1 + stride] = *data++; break; } mask <<= 2; } break; case 32: // vector quantization - 2 colors mask = AV_RB16(msk); msk += 2; for(y = 0; y < 4; y++){ for(x = 0; x < 4; x++){ tmp[x] = data[mask & 1]; mask >>= 1; } tmp += stride; tmp2 += stride; } data += 2; break; case 33: // vector quantization - 3 or 4 colors case 34: mask = AV_RB32(msk); msk += 4; for(y = 0; y < 4; y++){ for(x = 0; x < 4; x++){ tmp[x] = data[mask & 3]; mask >>= 2; } tmp += stride; tmp2 += stride; } data += type - 30; break; default: av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type); return AVERROR_INVALIDDATA; } } dst += stride * 4; ref += stride * 4; } return 0; }