+ if (fc->first_stream_chunk < 0) {
+ 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;
+ fc->stream_start = *now;
+ fc->first_stream_chunk = mmd->current_chunk;
+ g->first_chunk = mmd->current_chunk;
+ g->num = 0;
+ g->start = *now;
+ } else {
+ /*
+ * Start and duration of this group depend only on the previous
+ * group. Compute the new group start as g->start += g->duration.
+ */
+ struct timeval tmp = g->start;
+ tv_add(&tmp, &g->duration, &g->start);
+ k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
+ set_group_timing(fc, g);
+ g->first_chunk += g->num_chunks;
+ g->num++;
+ }
+ if (g->first_chunk >= mmd->afd.afhi.chunks_total)
+ return 0;
+ if (need_audio_header(fc, vsst)) {
+ ret = num_slices(vsst->header_len, fc, &g->num_header_slices);
+ if (ret < 0)
+ return ret;
+ } else
+ g->num_header_slices = 0;
+ afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &start_buf,
+ &len);
+ data_slices = k - g->num_header_slices;
+ assert(data_slices);
+ max_data_size = slice_bytes * data_slices;
+ g->bytes = 0;
+ for (i = g->first_chunk; i < mmd->afd.afhi.chunks_total; i++) {
+ afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
+ if (g->bytes + len > max_data_size)
+ break;
+ g->bytes += len;
+ }
+ g->num_chunks = i - g->first_chunk;
+ assert(g->num_chunks);
+ fc->current_slice_num = 0;
+ if (g->num == 0)
+ set_group_timing(fc, g);
+
+ /* setup header slices */
+ buf = vsst->header_buf;
+ for (i = 0; i < g->num_header_slices; i++) {
+ fc->src_data[i] = (const unsigned char *)buf;
+ buf += slice_bytes;
+ }