diff --git a/libavcodec/dca.h b/libavcodec/dca.h
index ea3f9c5d0d..ccb02af91c 100644
--- a/libavcodec/dca.h
+++ b/libavcodec/dca.h
@@ -4,6 +4,7 @@
  * Copyright (C) 2004 Benjamin Zores
  * Copyright (C) 2006 Benjamin Larsson
  * Copyright (C) 2007 Konstantin Shishkov
+ * Copyright (C) 2016 foo86
  *
  * This file is part of FFmpeg.
  *
@@ -30,6 +31,99 @@
 #include "libavutil/internal.h"
 #include "libavutil/intreadwrite.h"
 
+enum DCASpeaker {
+    DCA_SPEAKER_C,    DCA_SPEAKER_L,    DCA_SPEAKER_R,    DCA_SPEAKER_Ls,
+    DCA_SPEAKER_Rs,   DCA_SPEAKER_LFE1, DCA_SPEAKER_Cs,   DCA_SPEAKER_Lsr,
+    DCA_SPEAKER_Rsr,  DCA_SPEAKER_Lss,  DCA_SPEAKER_Rss,  DCA_SPEAKER_Lc,
+    DCA_SPEAKER_Rc,   DCA_SPEAKER_Lh,   DCA_SPEAKER_Ch,   DCA_SPEAKER_Rh,
+    DCA_SPEAKER_LFE2, DCA_SPEAKER_Lw,   DCA_SPEAKER_Rw,   DCA_SPEAKER_Oh,
+    DCA_SPEAKER_Lhs,  DCA_SPEAKER_Rhs,  DCA_SPEAKER_Chr,  DCA_SPEAKER_Lhr,
+    DCA_SPEAKER_Rhr,  DCA_SPEAKER_Cl,   DCA_SPEAKER_Ll,   DCA_SPEAKER_Rl,
+    DCA_SPEAKER_RSV1, DCA_SPEAKER_RSV2, DCA_SPEAKER_RSV3, DCA_SPEAKER_RSV4,
+
+    DCA_SPEAKER_COUNT
+};
+
+enum DCASpeakerMask {
+    DCA_SPEAKER_MASK_C     = 0x00000001,
+    DCA_SPEAKER_MASK_L     = 0x00000002,
+    DCA_SPEAKER_MASK_R     = 0x00000004,
+    DCA_SPEAKER_MASK_Ls    = 0x00000008,
+    DCA_SPEAKER_MASK_Rs    = 0x00000010,
+    DCA_SPEAKER_MASK_LFE1  = 0x00000020,
+    DCA_SPEAKER_MASK_Cs    = 0x00000040,
+    DCA_SPEAKER_MASK_Lsr   = 0x00000080,
+    DCA_SPEAKER_MASK_Rsr   = 0x00000100,
+    DCA_SPEAKER_MASK_Lss   = 0x00000200,
+    DCA_SPEAKER_MASK_Rss   = 0x00000400,
+    DCA_SPEAKER_MASK_Lc    = 0x00000800,
+    DCA_SPEAKER_MASK_Rc    = 0x00001000,
+    DCA_SPEAKER_MASK_Lh    = 0x00002000,
+    DCA_SPEAKER_MASK_Ch    = 0x00004000,
+    DCA_SPEAKER_MASK_Rh    = 0x00008000,
+    DCA_SPEAKER_MASK_LFE2  = 0x00010000,
+    DCA_SPEAKER_MASK_Lw    = 0x00020000,
+    DCA_SPEAKER_MASK_Rw    = 0x00040000,
+    DCA_SPEAKER_MASK_Oh    = 0x00080000,
+    DCA_SPEAKER_MASK_Lhs   = 0x00100000,
+    DCA_SPEAKER_MASK_Rhs   = 0x00200000,
+    DCA_SPEAKER_MASK_Chr   = 0x00400000,
+    DCA_SPEAKER_MASK_Lhr   = 0x00800000,
+    DCA_SPEAKER_MASK_Rhr   = 0x01000000,
+    DCA_SPEAKER_MASK_Cl    = 0x02000000,
+    DCA_SPEAKER_MASK_Ll    = 0x04000000,
+    DCA_SPEAKER_MASK_Rl    = 0x08000000,
+};
+
+#define DCA_SPEAKER_LAYOUT_MONO         (DCA_SPEAKER_MASK_C)
+#define DCA_SPEAKER_LAYOUT_STEREO       (DCA_SPEAKER_MASK_L | DCA_SPEAKER_MASK_R)
+#define DCA_SPEAKER_LAYOUT_2POINT1      (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_LFE1)
+#define DCA_SPEAKER_LAYOUT_3_0          (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_C)
+#define DCA_SPEAKER_LAYOUT_2_1          (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_Cs)
+#define DCA_SPEAKER_LAYOUT_3_1          (DCA_SPEAKER_LAYOUT_3_0 | DCA_SPEAKER_MASK_Cs)
+#define DCA_SPEAKER_LAYOUT_2_2          (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_Ls | DCA_SPEAKER_MASK_Rs)
+#define DCA_SPEAKER_LAYOUT_5POINT0      (DCA_SPEAKER_LAYOUT_3_0 | DCA_SPEAKER_MASK_Ls | DCA_SPEAKER_MASK_Rs)
+#define DCA_SPEAKER_LAYOUT_5POINT1      (DCA_SPEAKER_LAYOUT_5POINT0 | DCA_SPEAKER_MASK_LFE1)
+#define DCA_SPEAKER_LAYOUT_7POINT0_WIDE (DCA_SPEAKER_LAYOUT_5POINT0 | DCA_SPEAKER_MASK_Lw | DCA_SPEAKER_MASK_Rw)
+#define DCA_SPEAKER_LAYOUT_7POINT1_WIDE (DCA_SPEAKER_LAYOUT_7POINT0_WIDE | DCA_SPEAKER_MASK_LFE1)
+
+#define DCA_HAS_STEREO(mask) \
+    ((mask & DCA_SPEAKER_LAYOUT_STEREO) == DCA_SPEAKER_LAYOUT_STEREO)
+
+enum DCARepresentationType {
+    DCA_REPR_TYPE_LtRt = 2,
+    DCA_REPR_TYPE_LhRh = 3
+};
+
+enum DCAExtensionMask {
+    DCA_CSS_CORE   = 0x001,
+    DCA_CSS_XXCH   = 0x002,
+    DCA_CSS_X96    = 0x004,
+    DCA_CSS_XCH    = 0x008,
+    DCA_CSS_MASK   = 0x00f,
+    DCA_EXSS_CORE  = 0x010,
+    DCA_EXSS_XBR   = 0x020,
+    DCA_EXSS_XXCH  = 0x040,
+    DCA_EXSS_X96   = 0x080,
+    DCA_EXSS_LBR   = 0x100,
+    DCA_EXSS_XLL   = 0x200,
+    DCA_EXSS_RSV1  = 0x400,
+    DCA_EXSS_RSV2  = 0x800,
+    DCA_EXSS_MASK  = 0xff0,
+};
+
+enum DCADownMixType {
+    DCA_DMIX_TYPE_1_0,
+    DCA_DMIX_TYPE_LoRo,
+    DCA_DMIX_TYPE_LtRt,
+    DCA_DMIX_TYPE_3_0,
+    DCA_DMIX_TYPE_2_1,
+    DCA_DMIX_TYPE_2_2,
+    DCA_DMIX_TYPE_3_1,
+
+    DCA_DMIX_TYPE_COUNT
+};
+
 extern av_export const uint32_t avpriv_dca_sample_rates[16];
 
 /**