+ memcpy(s->output[ch], output[ch], sizeof(**output) * AC3_BLOCK_SIZE);
+
+ /*
+ * AVMatrixEncoding
+ *
+ * Check whether the input layout is compatible, and make sure we're not
+ * downmixing (else the matrix encoding is no longer applicable).
+ */
+ matrix_encoding = AV_MATRIX_ENCODING_NONE;
+ if (s->channel_mode == AC3_CHMODE_STEREO &&
+ s->channel_mode == (s->output_mode & ~AC3_OUTPUT_LFEON)) {
+ if (s->dolby_surround_mode == AC3_DSURMOD_ON)
+ matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
+ else if (s->dolby_headphone_mode == AC3_DHEADPHONMOD_ON)
+ matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE;
+ } else if (s->channel_mode >= AC3_CHMODE_2F2R &&
+ s->channel_mode == (s->output_mode & ~AC3_OUTPUT_LFEON)) {
+ switch (s->dolby_surround_ex_mode) {
+ case AC3_DSUREXMOD_ON: // EX or PLIIx
+ matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX;
+ break;
+ case AC3_DSUREXMOD_PLIIZ:
+ matrix_encoding = AV_MATRIX_ENCODING_DPLIIZ;
+ break;
+ default: // not indicated or off
+ break;
+ }
+ }
+ if ((ret = ff_side_data_update_matrix_encoding(frame, matrix_encoding)) < 0)
+ return ret;
+
+ /* AVDownmixInfo */
+ if ((downmix_info = av_downmix_info_update_side_data(frame))) {
+ switch (s->preferred_downmix) {
+ case AC3_DMIXMOD_LTRT:
+ downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_LTRT;
+ break;
+ case AC3_DMIXMOD_LORO:
+ downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_LORO;
+ break;
+ case AC3_DMIXMOD_DPLII:
+ downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_DPLII;
+ break;
+ default:
+ downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_UNKNOWN;
+ break;
+ }
+ downmix_info->center_mix_level = gain_levels[s-> center_mix_level];
+ downmix_info->center_mix_level_ltrt = gain_levels[s-> center_mix_level_ltrt];
+ downmix_info->surround_mix_level = gain_levels[s-> surround_mix_level];
+ downmix_info->surround_mix_level_ltrt = gain_levels[s->surround_mix_level_ltrt];
+ if (s->lfe_mix_level_exists)
+ downmix_info->lfe_mix_level = gain_levels_lfe[s->lfe_mix_level];
+ else
+ downmix_info->lfe_mix_level = 0.0; // -inf dB
+ } else
+ return AVERROR(ENOMEM);