avcodec/libdcadec: export matrix encoding side data

Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>

configure

@@ -1829,6 +1829,7 @@ TYPES_LIST="
     CONDITION_VARIABLE_Ptr
     socklen_t
     struct_addrinfo
+    struct_dcadec_exss_info_matrix_encoding
     struct_group_source_req
     struct_ip_mreq_source
     struct_ipv6_mreq
@@ -5121,7 +5122,8 @@ enabled libcelt           && require libcelt celt/celt.h celt_decode -lcelt0 &&
                              { check_lib celt/celt.h celt_decoder_create_custom -lcelt0 ||
                                die "ERROR: libcelt must be installed and version must be >= 0.11.0."; }
 enabled libcaca           && require_pkg_config caca caca.h caca_create_canvas
-enabled libdcadec         && require_pkg_config dcadec libdcadec/dca_context.h dcadec_context_create
+enabled libdcadec         && require_pkg_config dcadec libdcadec/dca_context.h dcadec_context_create &&
+                             check_struct libdcadec/dca_context.h "struct dcadec_exss_info" matrix_encoding
 enabled libfaac           && require2 libfaac "stdint.h faac.h" faacEncGetVersion -lfaac
 enabled libfdk_aac        && { use_pkg_config fdk-aac "fdk-aac/aacenc_lib.h" aacEncOpen ||
                                { require libfdk_aac fdk-aac/aacenc_lib.h aacEncOpen -lfdk-aac &&

libavcodec/libdcadec.c

@@ -41,6 +41,7 @@ static int dcadec_decode_frame(AVCodecContext *avctx, void *data,
 {
     DCADecContext *s = avctx->priv_data;
     AVFrame *frame = data;
+    struct dcadec_exss_info *exss;
     int ret, i, k;
     int **samples, nsamples, channel_mask, sample_rate, bits_per_sample, profile;
     uint32_t mrk;
@@ -127,6 +128,26 @@ static int dcadec_decode_frame(AVCodecContext *avctx, void *data,
     } else
         avctx->bit_rate = 0;
 
+#if HAVE_STRUCT_DCADEC_EXSS_INFO_MATRIX_ENCODING
+    if (exss = dcadec_context_get_exss_info(s->ctx)) {
+        enum AVMatrixEncoding matrix_encoding = AV_MATRIX_ENCODING_NONE;
+
+        switch(exss->matrix_encoding) {
+        case DCADEC_MATRIX_ENCODING_SURROUND:
+            matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
+            break;
+        case DCADEC_MATRIX_ENCODING_HEADPHONE:
+            matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE;
+            break;
+        }
+        dcadec_context_free_exss_info(exss);
+
+        if (matrix_encoding != AV_MATRIX_ENCODING_NONE &&
+            (ret = ff_side_data_update_matrix_encoding(frame, matrix_encoding)) < 0)
+            return ret;
+    }
+#endif
+
     frame->nb_samples = nsamples;
     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
         return ret;