+ skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));
+
+ if (extensions_mask & DCA_EXT_EXSS_XLL)
+ s->profile = FF_PROFILE_DTS_HD_MA;
+ else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |
+ DCA_EXT_EXSS_XXCH))
+ s->profile = FF_PROFILE_DTS_HD_HRA;
+
+ if (!(extensions_mask & DCA_EXT_CORE))
+ av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");
+ if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)
+ av_log(s->avctx, AV_LOG_WARNING,
+ "DTS extensions detection mismatch (%d, %d)\n",
+ extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);
+
+ return 0;
+}
+
+/**
+ * Parse extension substream header (HD)
+ */
+static void dca_exss_parse_header(DCAContext *s)
+{
+ int ss_index;
+ int blownup;
+ int num_audiop = 1;
+ int num_assets = 1;
+ int active_ss_mask[8];
+ int i, j;
+
+ if (get_bits_left(&s->gb) < 52)
+ return;
+
+ skip_bits(&s->gb, 8); // user data
+ ss_index = get_bits(&s->gb, 2);
+
+ blownup = get_bits1(&s->gb);
+ skip_bits(&s->gb, 8 + 4 * blownup); // header_size
+ skip_bits(&s->gb, 16 + 4 * blownup); // hd_size
+
+ s->static_fields = get_bits1(&s->gb);
+ if (s->static_fields) {
+ skip_bits(&s->gb, 2); // reference clock code
+ skip_bits(&s->gb, 3); // frame duration code
+
+ if (get_bits1(&s->gb))
+ skip_bits_long(&s->gb, 36); // timestamp
+
+ /* a single stream can contain multiple audio assets that can be
+ * combined to form multiple audio presentations */
+
+ num_audiop = get_bits(&s->gb, 3) + 1;
+ if (num_audiop > 1) {
+ av_log_ask_for_sample(s->avctx, "Multiple DTS-HD audio presentations.");
+ /* ignore such streams for now */
+ return;
+ }
+
+ num_assets = get_bits(&s->gb, 3) + 1;
+ if (num_assets > 1) {
+ av_log_ask_for_sample(s->avctx, "Multiple DTS-HD audio assets.");
+ /* ignore such streams for now */
+ return;
+ }
+
+ for (i = 0; i < num_audiop; i++)
+ active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);
+
+ for (i = 0; i < num_audiop; i++)
+ for (j = 0; j <= ss_index; j++)
+ if (active_ss_mask[i] & (1 << j))
+ skip_bits(&s->gb, 8); // active asset mask
+
+ s->mix_metadata = get_bits1(&s->gb);
+ if (s->mix_metadata) {
+ int mix_out_mask_size;
+
+ skip_bits(&s->gb, 2); // adjustment level
+ mix_out_mask_size = (get_bits(&s->gb, 2) + 1) << 2;
+ s->num_mix_configs = get_bits(&s->gb, 2) + 1;
+
+ for (i = 0; i < s->num_mix_configs; i++) {
+ int mix_out_mask = get_bits(&s->gb, mix_out_mask_size);
+ s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);
+ }
+ }
+ }
+
+ for (i = 0; i < num_assets; i++)
+ skip_bits_long(&s->gb, 16 + 4 * blownup); // asset size
+
+ for (i = 0; i < num_assets; i++) {
+ if (dca_exss_parse_asset_header(s))
+ return;
+ }
+
+ /* not parsed further, we were only interested in the extensions mask
+ * from the asset header */