- uint32_t largest = afh_get_largest_chunk_size(&mmd->afd.afhi)
- + vsst->header_len;
- uint8_t needed = num_slices(largest, fc), want;
- if (needed > fc->fcp->data_slices_per_group)
- PARA_WARNING_LOG("fec parms insufficient for this audio file\n");
- want = PARA_MAX(needed, fc->fcp->data_slices_per_group);
- if (want != k) {
- int ret;
- fec_free(fc->parms);
- fc->src_data = para_realloc(fc->src_data, want * sizeof(char *));
- ret = fec_new(want, want + fc->fcp->slices_per_group
- - fc->fcp->data_slices_per_group, &fc->parms);
- if (ret < 0)
- return ret;
- k = want;
- fc->num_extra_slices = 0;
- if (k > fc->fcp->data_slices_per_group) {
- fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
- PARA_NOTICE_LOG("using %d extra slices\n",
- fc->num_extra_slices);
- }
- }
+ uint8_t hs, ds; /* needed header/data slices */
+ uint8_t rs = fc->fcp->slices_per_group
+ - fc->fcp->data_slices_per_group; /* redundant slices */
+ int n;
+
+ ret = num_slices(vsst->header_len, fc, &hs);
+ if (ret < 0)
+ return ret;
+ ret = num_slices(afh_get_largest_chunk_size(&mmd->afd.afhi),
+ fc, &ds);
+ if (ret < 0)
+ return ret;
+ k = (int)hs + ds;
+ if (k > 255)
+ return -E_BAD_CT;
+ if (k < fc->fcp->data_slices_per_group)
+ k = fc->fcp->data_slices_per_group;
+ n = k + rs;
+ fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
+ PARA_NOTICE_LOG("fec parms %d:%d:%d (%d extra slices)\n",
+ slice_bytes, k, n, fc->num_extra_slices);
+ fec_free(fc->parms);
+ fc->src_data = para_realloc(fc->src_data, k * sizeof(char *));
+ ret = fec_new(k, n, &fc->parms);
+ if (ret < 0)
+ return ret;