downmix support for ffmpeg audio sources

now we can eat our own dogfood. i.e. aac 6ch discrete input now works,
along with any other multi-channel audio ffmpeg can toss at us.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@3182 b64f7644-9d1e-0410-96f1-a4d463321fa5

1 files changed, 1348 insertions, 0 deletions

diff --git a/libhb/downmix.c b/libhb/downmix.c
new file mode 100644
index 000000000..0ab9b90f3
--- /dev/null
+++ b/libhb/downmix.c
@@ -0,0 +1,1348 @@
+/* $Id: downmix.c,v 1.15 2005/03/17 19:22:47 stebbins Exp $
+
+   This file is part of the HandBrake source code.
+   Homepage: <http://handbrake.fr/>.
+   It may be used under the terms of the GNU General Public License. */
+
+#include <string.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include "common.h"
+#include "downmix.h"
+
+#define LVL_PLUS6DB 2.0
+#define LVL_PLUS3DB 1.4142135623730951
+#define LVL_3DB 0.7071067811865476
+#define LVL_45DB 0.5946035575013605
+#define LVL_6DB 0.5
+
+#define LVL_SQRT_1_3 0.577350269
+#define LVL_SQRT_2_3 0.816496581
+
+#define HB_CH_FRONT_LEFT             0x00000001
+#define HB_CH_FRONT_RIGHT            0x00000002
+#define HB_CH_FRONT_CENTER           0x00000004
+#define HB_CH_LOW_FREQUENCY          0x00000008
+#define HB_CH_BACK_LEFT              0x00000010
+#define HB_CH_BACK_RIGHT             0x00000020
+#define HB_CH_BACK_CENTER            0x00000040
+#define HB_CH_SIDE_LEFT              0x00000080
+#define HB_CH_SIDE_RIGHT             0x00000100
+
+#define HB_CH_SURROUND_MASK          0x000001f0
+#define HB_CH_MASK                   0x000007ff
+
+#define HB_CH_DOLBY                  0x00000800
+#define HB_CH_DPLII                  0x00001000
+
+#define DOWNMIX_MONO 0
+#define DOWNMIX_STEREO 1
+#define DOWNMIX_3F 2
+#define DOWNMIX_2F1R 3
+#define DOWNMIX_3F1R 4
+#define DOWNMIX_2F2R 5
+#define DOWNMIX_3F2R 6
+#define DOWNMIX_3F4R 7
+#define DOWNMIX_DOLBY 8
+#define DOWNMIX_DPLII 9
+#define DOWNMIX_NUM_MODES 10
+
+#define DOWNMIX_CHANNEL_MASK 0x0f
+
+#define DOWNMIX_LFE_FLAG 0x10
+#define DOWNMIX_FLAGS_MASK 0x10
+
+hb_sample_t downmix_matrix[DOWNMIX_NUM_MODES][DOWNMIX_NUM_MODES][8][8] =
+{
+// MONO in
+{
+    // MONO out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // STEREO out
+    { { LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,       0,       1, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 } },
+    // 3F out
+    { { 0, LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0,       0,       1, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 } },
+    // 2F1R out
+    { { LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 1, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 } },
+    // 3F1R out
+    { { 0, LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 1, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 } },
+    // 2F2R out
+    { { LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 1, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 } },
+    // 3F2R out
+    { { 0, LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 1, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 } },
+    // 3F4R out
+    { { 0, LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 1 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 } },
+    // DOLBY out
+    { { LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,       0,       1, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 } },
+    // DPLII out
+    { { LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,       0,       1, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 } },
+},
+// STEREO in
+{
+    // MONO out
+    { { LVL_3DB, 0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB, 0, 0, 0, 0, 0, 0, 0 },
+      {       0, 1, 0, 0, 0, 0, 0, 0 },
+      {       0, 0, 0, 0, 0, 0, 0, 0 },
+      {       0, 0, 0, 0, 0, 0, 0, 0 },
+      {       0, 0, 0, 0, 0, 0, 0, 0 },
+      {       0, 0, 0, 0, 0, 0, 0, 0 },
+      {       0, 0, 0, 0, 0, 0, 0, 0 } },
+    // STEREO out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F out
+    { { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 2F1R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F1R out
+    { { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 2F2R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F2R out
+    { { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 1, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F4R out
+    { { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 1 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // DOLBY out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // DPLII out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+},
+// 3F in
+{
+    // MONO out
+    { { LVL_PLUS3DB, 0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { 0,           1, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 } },
+    // STEREO out
+    { { 1, 1, 0, 0, 0, 0, 0, 0 },
+      { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 2F1R out
+    { { 1, 1, 0, 0, 0, 0, 0, 0 },
+      { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F1R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 2F2R out
+    { { 1, 1, 0, 0, 0, 0, 0, 0 },
+      { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F2R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 1, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F4R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 1 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // DOLBY out
+    { { 1, 1, 0, 0, 0, 0, 0, 0 },
+      { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // DPLII out
+    { { 1, 1, 0, 0, 0, 0, 0, 0 },
+      { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+},
+// 2F1R in
+{
+    // MONO out
+    { { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { 0,           1, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 } },
+    // STEREO out
+    { { 1,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       1,       0, 0, 0, 0, 0, 0 },
+      { LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,       0,       1, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 } },
+    // 3F out
+    { { 0, 1,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       1,       0, 0, 0, 0, 0 },
+      { 0, LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0,       0,       1, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 } },
+    // 2F1R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F1R out
+    { { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 2F2R out
+    { { 1, 0, 0,       0,       0, 0, 0, 0 },
+      { 0, 1, 0,       0,       0, 0, 0, 0 },
+      { 0, 0, LVL_3DB, LVL_3DB, 0, 0, 0, 0 },
+      { 0, 0, 0,       0,       1, 0, 0, 0 },
+      { 0, 0, 0,       0,       0, 0, 0, 0 },
+      { 0, 0, 0,       0,       0, 0, 0, 0 },
+      { 0, 0, 0,       0,       0, 0, 0, 0 },
+      { 0, 0, 0,       0,       0, 0, 0, 0 } },
+    // 3F2R out
+    { { 0, 1, 0, 0,       0,       0, 0, 0 },
+      { 0, 0, 1, 0,       0,       0, 0, 0 },
+      { 0, 0, 0, LVL_3DB, LVL_3DB, 0, 0, 0 },
+      { 0, 0, 0, 0,       0,       1, 0, 0 },
+      { 0, 0, 0, 0,       0,       0, 0, 0 },
+      { 0, 0, 0, 0,       0,       0, 0, 0 },
+      { 0, 0, 0, 0,       0,       0, 0, 0 },
+      { 0, 0, 0, 0,       0,       0, 0, 0 } },
+    // 3F4R out
+    { { 0, 1, 0, 0, 0, 0,       0      , 0 },
+      { 0, 0, 1, 0, 0, 0,       0      , 0 },
+      { 0, 0, 0, 0, 0, LVL_3DB, LVL_3DB, 0 },
+      { 0, 0, 0, 0, 0, 0,       0      , 1 },
+      { 0, 0, 0, 0, 0, 0,       0      , 0 },
+      { 0, 0, 0, 0, 0, 0,       0      , 0 },
+      { 0, 0, 0, 0, 0, 0,       0      , 0 },
+      { 0, 0, 0, 0, 0, 0,       0      , 0 } },
+    // DOLBY out
+    { { 1,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        1,       0, 0, 0, 0, 0, 0 },
+      { -LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,        0,       1, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 } },
+    // DPLII out
+    { { 1,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        1,       0, 0, 0, 0, 0, 0 },
+      { -LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,        0,       1, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 } },
+},
+// 3F1R in
+{
+    // MONO out
+    { { LVL_PLUS3DB, 0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { 0,           1, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 } },
+    // STEREO out
+    { { 1,       1,       0, 0, 0, 0, 0, 0 },
+      { 1,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       1,       0, 0, 0, 0, 0, 0 },
+      { LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,       0,       1, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       0,       0, 0, 0, 0, 0, 0 } },
+    // 3F out
+    { { 1, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 1,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       1,       0, 0, 0, 0, 0 },
+      { 0, LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0,       0,       1, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       0,       0, 0, 0, 0, 0 } },
+    // 2F1R out
+    { { 1, 1, 0, 0, 0, 0, 0, 0 },
+      { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F1R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 2F2R out
+    { { 1, 1, 0,       0,       0, 0, 0, 0 },
+      { 1, 0, 0,       0,       0, 0, 0, 0 },
+      { 0, 1, 0,       0,       0, 0, 0, 0 },
+      { 0, 0, LVL_3DB, LVL_3DB, 0, 0, 0, 0 },
+      { 0, 0, 0,       0,       1, 0, 0, 0 },
+      { 0, 0, 0,       0,       0, 0, 0, 0 },
+      { 0, 0, 0,       0,       0, 0, 0, 0 },
+      { 0, 0, 0,       0,       0, 0, 0, 0 } },
+    // 3F2R out
+    { { 1, 0, 0, 0,       0,       0, 0, 0 },
+      { 0, 1, 0, 0,       0,       0, 0, 0 },
+      { 0, 0, 1, 0,       0,       0, 0, 0 },
+      { 0, 0, 0, LVL_3DB, LVL_3DB, 0, 0, 0 },
+      { 0, 0, 0, 0,       0,       1, 0, 0 },
+      { 0, 0, 0, 0,       0,       0, 0, 0 },
+      { 0, 0, 0, 0,       0,       0, 0, 0 },
+      { 0, 0, 0, 0,       0,       0, 0, 0 } },
+    // 3F4R out
+    { { 1, 0, 0, 0, 0, 0,       0      , 0 },
+      { 0, 1, 0, 0, 0, 0,       0      , 0 },
+      { 0, 0, 1, 0, 0, 0,       0      , 0 },
+      { 0, 0, 0, 0, 0, LVL_3DB, LVL_3DB, 0 },
+      { 0, 0, 0, 0, 0, 0,       0      , 1 },
+      { 0, 0, 0, 0, 0, 0,       0      , 0 },
+      { 0, 0, 0, 0, 0, 0,       0      , 0 },
+      { 0, 0, 0, 0, 0, 0,       0      , 0 } },
+    // DOLBY out
+    { { LVL_3DB,  LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 1,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        1,       0, 0, 0, 0, 0, 0 },
+      { -LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,        0,       1, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 } },
+    // DPLII out
+    { { LVL_3DB,  LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 1,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        1,       0, 0, 0, 0, 0, 0 },
+      { -LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,        0,       1, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 } },
+},
+// 2F2R in
+{
+    // MONO out
+    { { LVL_3DB, 0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB, 0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB, 0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB, 0, 0, 0, 0, 0, 0, 0 },
+      { 0,       1, 0, 0, 0, 0, 0, 0 },
+      { 0,       0, 0, 0, 0, 0, 0, 0 },
+      { 0,       0, 0, 0, 0, 0, 0, 0 },
+      { 0,       0, 0, 0, 0, 0, 0, 0 } },
+    // STEREO out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F out
+    { { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 2F1R out
+    { { 1, 0, 0,       0, 0, 0, 0, 0 },
+      { 0, 1, 0,       0, 0, 0, 0, 0 },
+      { 0, 0, LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0, LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0, 0,       1, 0, 0, 0, 0 },
+      { 0, 0, 0,       0, 0, 0, 0, 0 },
+      { 0, 0, 0,       0, 0, 0, 0, 0 },
+      { 0, 0, 0,       0, 0, 0, 0, 0 } },
+    // 3F1R out
+    { { 0, 1, 0, 0,       0, 0, 0, 0 },
+      { 0, 0, 1, 0,       0, 0, 0, 0 },
+      { 0, 0, 0, LVL_3DB, 0, 0, 0, 0 },
+      { 0, 0, 0, LVL_3DB, 0, 0, 0, 0 },
+      { 0, 0, 0, 0,       1, 0, 0, 0 },
+      { 0, 0, 0, 0,       0, 0, 0, 0 },
+      { 0, 0, 0, 0,       0, 0, 0, 0 },
+      { 0, 0, 0, 0,       0, 0, 0, 0 } },
+    // 2F2R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F2R out
+    { { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 1, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F4R out
+    { { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 1, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 1, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 1 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // DOLBY out
+    { { 1,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        1,       0, 0, 0, 0, 0, 0 },
+      { -LVL_6DB, LVL_6DB, 0, 0, 0, 0, 0, 0 },
+      { -LVL_6DB, LVL_6DB, 0, 0, 0, 0, 0, 0 },
+      { 0,        0,       1, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 } },
+    // DPLII out
+    { { 1,             0,             0, 0, 0, 0, 0, 0 },
+      { 0,             1,             0, 0, 0, 0, 0, 0 },
+      { LVL_SQRT_2_3,  -LVL_SQRT_1_3, 0, 0, 0, 0, 0, 0 },
+      { -LVL_SQRT_1_3, LVL_SQRT_2_3,  0, 0, 0, 0, 0, 0 },
+      { 0,             0,             1, 0, 0, 0, 0, 0 },
+      { 0,             0,             0, 0, 0, 0, 0, 0 },
+      { 0,             0,             0, 0, 0, 0, 0, 0 },
+      { 0,             0,             0, 0, 0, 0, 0, 0 } },
+},
+// 3F2R in
+{
+    // MONO out
+    { { LVL_PLUS3DB, 0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { 0,           1, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 },
+      { 0,           0, 0, 0, 0, 0, 0, 0 } },
+    // STEREO out
+    { { 1, 1, 0, 0, 0, 0, 0, 0 },
+      { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 2F1R out
+    { { 1, 1, 0,       0, 0, 0, 0, 0 },
+      { 1, 0, 0,       0, 0, 0, 0, 0 },
+      { 0, 1, 0,       0, 0, 0, 0, 0 },
+      { 0, 0, LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0, LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0, 0,       1, 0, 0, 0, 0 },
+      { 0, 0, 0,       0, 0, 0, 0, 0 },
+      { 0, 0, 0,       0, 0, 0, 0, 0 } },
+    // 3F1R out
+    { { 1, 0, 0, 0,       0, 0, 0, 0 },
+      { 0, 1, 0, 0,       0, 0, 0, 0 },
+      { 0, 0, 1, 0,       0, 0, 0, 0 },
+      { 0, 0, 0, LVL_3DB, 0, 0, 0, 0 },
+      { 0, 0, 0, LVL_3DB, 0, 0, 0, 0 },
+      { 0, 0, 0, 0,       1, 0, 0, 0 },
+      { 0, 0, 0, 0,       0, 0, 0, 0 },
+      { 0, 0, 0, 0,       0, 0, 0, 0 } },
+    // 2F2R out
+    { { 1, 1, 0, 0, 0, 0, 0, 0 },
+      { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F2R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 1, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // 3F4R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 1, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 1, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 1 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 0 } },
+    // DOLBY out
+    { { LVL_3DB,  LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 1,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        1,       0, 0, 0, 0, 0, 0 },
+      { -LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { -LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,        0,       1, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        0,       0, 0, 0, 0, 0, 0 } },
+    // DPLII out
+    { { LVL_3DB,       LVL_3DB,       0, 0, 0, 0, 0, 0 },
+      { 1,             0,             0, 0, 0, 0, 0, 0 },
+      { 0,             1,             0, 0, 0, 0, 0, 0 },
+      { LVL_SQRT_2_3,  -LVL_SQRT_1_3, 0, 0, 0, 0, 0, 0 },
+      { -LVL_SQRT_1_3, LVL_SQRT_2_3,  0, 0, 0, 0, 0, 0 },
+      { 0,             0,             1, 0, 0, 0, 0, 0 },
+      { 0,             0,             0, 0, 0, 0, 0, 0 },
+      { 0,             0,             0, 0, 0, 0, 0, 0 } },
+},
+// 3F4R in
+{
+    // MONO out
+    { { LVL_PLUS3DB, 0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_6DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_6DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_6DB,     0, 0, 0, 0, 0, 0, 0 },
+      { LVL_6DB,     0, 0, 0, 0, 0, 0, 0 },
+      { 0,           1, 0, 0, 0, 0, 0, 0 } },
+    // STEREO out
+    { { 1,       1,       0, 0, 0, 0, 0, 0 },
+      { 1,       0,       0, 0, 0, 0, 0, 0 },
+      { 0,       1,       0, 0, 0, 0, 0, 0 },
+      { LVL_3DB, 0,       0, 0, 0, 0, 0, 0 },
+      { 0,       LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { LVL_3DB, 0,       0, 0, 0, 0, 0, 0 },
+      { 0,       LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,       0,       1, 0, 0, 0, 0, 0 } },
+    // 3F out
+    { { 1, 0,       0,       0, 0, 0, 0, 0 },
+      { 0, 1,       0,       0, 0, 0, 0, 0 },
+      { 0, 0,       1,       0, 0, 0, 0, 0 },
+      { 0, LVL_3DB, 0,       0, 0, 0, 0, 0 },
+      { 0, 0,       LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, LVL_3DB, 0,       0, 0, 0, 0, 0 },
+      { 0, 0,       LVL_3DB, 0, 0, 0, 0, 0 },
+      { 0, 0,       0,       1, 0, 0, 0, 0 } },
+    // 2F1R out
+    { { 1, 1, 0,       0, 0, 0, 0, 0 },
+      { 1, 0, 0,       0, 0, 0, 0, 0 },
+      { 0, 1, 0,       0, 0, 0, 0, 0 },
+      { 0, 0, LVL_6DB, 0, 0, 0, 0, 0 },
+      { 0, 0, LVL_6DB, 0, 0, 0, 0, 0 },
+      { 0, 0, LVL_6DB, 0, 0, 0, 0, 0 },
+      { 0, 0, LVL_6DB, 0, 0, 0, 0, 0 },
+      { 0, 0, 0,       1, 0, 0, 0, 0 } },
+    // 3F1R out
+    { { 1, 0, 0, 0,       0, 0, 0, 0 },
+      { 0, 1, 0, 0,       0, 0, 0, 0 },
+      { 0, 0, 1, 0,       0, 0, 0, 0 },
+      { 0, 0, 0, LVL_6DB, 0, 0, 0, 0 },
+      { 0, 0, 0, LVL_6DB, 0, 0, 0, 0 },
+      { 0, 0, 0, LVL_6DB, 0, 0, 0, 0 },
+      { 0, 0, 0, LVL_6DB, 0, 0, 0, 0 },
+      { 0, 0, 0, 0,       1, 0, 0, 0 } },
+    // 2F2R out
+    { { 1, 1, 0,       0,       0, 0, 0, 0 },
+      { 1, 0, 0,       0,       0, 0, 0, 0 },
+      { 0, 1, 0,       0,       0, 0, 0, 0 },
+      { 0, 0, LVL_3DB, 0,       0, 0, 0, 0 },
+      { 0, 0, 0,       LVL_3DB, 0, 0, 0, 0 },
+      { 0, 0, LVL_3DB, 0,       0, 0, 0, 0 },
+      { 0, 0, 0,       LVL_3DB, 0, 0, 0, 0 },
+      { 0, 0, 0,       0,       1, 0, 0, 0 } },
+    // 3F2R out
+    { { 1, 0, 0, 0,       0,       0, 0, 0 },
+      { 0, 1, 0, 0,       0,       0, 0, 0 },
+      { 0, 0, 1, 0,       0,       0, 0, 0 },
+      { 0, 0, 0, LVL_3DB, 0,       0, 0, 0 },
+      { 0, 0, 0, 0,       LVL_3DB, 0, 0, 0 },
+      { 0, 0, 0, LVL_3DB, 0,       0, 0, 0 },
+      { 0, 0, 0, 0,       LVL_3DB, 0, 0, 0 },
+      { 0, 0, 0, 0,       0,       1, 0, 0 } },
+    // 3F4R out
+    { { 1, 0, 0, 0, 0, 0, 0, 0 },
+      { 0, 1, 0, 0, 0, 0, 0, 0 },
+      { 0, 0, 1, 0, 0, 0, 0, 0 },
+      { 0, 0, 0, 1, 0, 0, 0, 0 },
+      { 0, 0, 0, 0, 1, 0, 0, 0 },
+      { 0, 0, 0, 0, 0, 1, 0, 0 },
+      { 0, 0, 0, 0, 0, 0, 1, 0 },
+      { 0, 0, 0, 0, 0, 0, 0, 1 } },
+    // DOLBY out
+    { { LVL_3DB,  LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 1,        0,       0, 0, 0, 0, 0, 0 },
+      { 0,        1,       0, 0, 0, 0, 0, 0 },
+      { -LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { -LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { -LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { -LVL_3DB, LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { 0,        0,       1, 0, 0, 0, 0, 0 } },
+    // DPLII out
+    { { LVL_3DB,               LVL_3DB,               0, 0, 0, 0, 0, 0 },
+      { 1,                     0,                     0, 0, 0, 0, 0, 0 },
+      { 0,                     1,                     0, 0, 0, 0, 0, 0 },
+      { LVL_SQRT_2_3*LVL_3DB,  -LVL_SQRT_1_3*LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { -LVL_SQRT_1_3*LVL_3DB, LVL_SQRT_2_3*LVL_3DB,  0, 0, 0, 0, 0, 0 },
+      { LVL_SQRT_2_3*LVL_3DB,  -LVL_SQRT_1_3*LVL_3DB, 0, 0, 0, 0, 0, 0 },
+      { -LVL_SQRT_1_3*LVL_3DB, LVL_SQRT_2_3*LVL_3DB,  0, 0, 0, 0, 0, 0 },
+      { 0,                     0,                     1, 0, 0, 0, 0, 0 } }
+},
+};
+
+static int channel_layout_map[DOWNMIX_NUM_MODES] =
+{
+    // DOWNMIX_MONO 
+    (HB_CH_FRONT_CENTER),
+    // DOWNMIX_STEREO 
+    (HB_CH_FRONT_LEFT|HB_CH_FRONT_RIGHT),
+    // DOWNMIX_3F 
+    (HB_CH_FRONT_LEFT|HB_CH_FRONT_RIGHT|HB_CH_FRONT_CENTER),
+    // DOWNMIX_2F1R 
+    (HB_CH_FRONT_LEFT|HB_CH_FRONT_RIGHT|HB_CH_BACK_CENTER),
+    // DOWNMIX_3F1R 
+    (HB_CH_FRONT_LEFT|HB_CH_FRONT_RIGHT|HB_CH_FRONT_CENTER|HB_CH_BACK_CENTER),
+    // DOWNMIX_2F2R 
+    (HB_CH_FRONT_LEFT|HB_CH_FRONT_RIGHT|HB_CH_BACK_LEFT|HB_CH_BACK_RIGHT),
+    // DOWNMIX_3F2R 
+    (HB_CH_FRONT_LEFT|HB_CH_FRONT_RIGHT|HB_CH_FRONT_CENTER|HB_CH_BACK_LEFT|HB_CH_BACK_RIGHT),
+    // DOWNMIX_3F4R 
+    (HB_CH_FRONT_LEFT|HB_CH_FRONT_RIGHT|HB_CH_FRONT_CENTER|HB_CH_SIDE_LEFT|
+     HB_CH_SIDE_RIGHT|HB_CH_BACK_LEFT|HB_CH_BACK_RIGHT),
+    // DOWNMIX_DOLBY 
+    (HB_CH_FRONT_LEFT|HB_CH_FRONT_RIGHT),
+    // DOWNMIX_DPLII 
+    (HB_CH_FRONT_LEFT|HB_CH_FRONT_RIGHT)
+};
+
+int hb_layout_to_mode(int layout)
+{
+    int mode;
+    switch (layout & HB_INPUT_CH_LAYOUT_DISCRETE_NO_LFE_MASK)
+    {
+        case HB_INPUT_CH_LAYOUT_MONO:
+            mode = DOWNMIX_MONO;
+            break;
+        case HB_INPUT_CH_LAYOUT_STEREO:
+            mode = DOWNMIX_STEREO;
+            break;
+        case HB_INPUT_CH_LAYOUT_3F:
+            mode = DOWNMIX_3F;
+            break;
+        case HB_INPUT_CH_LAYOUT_2F1R:
+            mode = DOWNMIX_2F1R;
+            break;
+        case HB_INPUT_CH_LAYOUT_3F1R:
+            mode = DOWNMIX_3F1R;
+            break;
+        case HB_INPUT_CH_LAYOUT_2F2R:
+            mode = DOWNMIX_2F2R;
+            break;
+        case HB_INPUT_CH_LAYOUT_3F2R:
+            mode = DOWNMIX_3F2R;
+            break;
+        case HB_INPUT_CH_LAYOUT_4F2R:
+            mode = DOWNMIX_3F2R|DOWNMIX_LFE_FLAG;
+            break;
+        case HB_INPUT_CH_LAYOUT_3F4R:
+            mode = DOWNMIX_3F4R;
+            break;
+        case HB_INPUT_CH_LAYOUT_DOLBY:
+            mode = DOWNMIX_STEREO;
+            break;
+        default:
+            mode = DOWNMIX_STEREO;
+            break;
+    }
+    if (layout & HB_INPUT_CH_LAYOUT_DISCRETE_LFE_MASK)
+        mode |= DOWNMIX_LFE_FLAG;
+    return mode;
+}
+
+int hb_mixdown_to_mode(uint32_t mixdown)
+{
+    switch (mixdown)
+    {
+        case HB_AMIXDOWN_MONO:
+            return DOWNMIX_MONO;
+        case HB_AMIXDOWN_STEREO:
+            return DOWNMIX_STEREO;
+        case HB_AMIXDOWN_DOLBY:
+            return DOWNMIX_DOLBY;
+        case HB_AMIXDOWN_DOLBYPLII:
+            return DOWNMIX_DPLII;
+        case HB_AMIXDOWN_6CH:
+            return DOWNMIX_3F2R|DOWNMIX_LFE_FLAG;
+        default:
+            return DOWNMIX_STEREO;
+    }
+}
+
+// ffmpeg gives us SMPTE channel layout
+// We could use this layout and remap channels in encfaac,
+// but VLC may have problems with remapping, so lets
+// allow remapping to the default QuickTime order which is:
+//
+// C   L   R   LS  RS  Rls Rrs LFE
+//
+// This arrangement also makes it possible to use half as
+// many downmix matrices since the matrix with and without
+// LFE are the same.
+//
+// Use hb_layout_remap to accomplish this.  For convenience
+// I've provided the necessary maps.
+//
+// SMPTE channel layout
+//
+// DUAL-MONO      L   R 
+// DUAL-MONO-LFE  L   R   LFE
+// MONO           M
+// MONO-LFE       M   LFE
+// STEREO         L   R 
+// STEREO-LFE     L   R   LFE
+// 3F             L   R   C
+// 3F-LFE         L   R   C    LFE
+// 2F1            L   R   S
+// 2F1-LFE        L   R   LFE  S
+// 3F1            L   R   C    S
+// 3F1-LFE        L   R   C    LFE S
+// 2F2            L   R   LS   RS
+// 2F2-LFE        L   R   LFE  LS   RS
+// 3F2            L   R   C    LS   RS
+// 3F2-LFE        L   R   C    LFE  LS   RS
+// 3F4            L   R   C    Rls  Rrs  LS   RS
+// 3F4-LFE        L   R   C    LFE  Rls  Rrs  LS   RS
+//
+
+// Map Indicies are mode, lfe, channel respectively
+int hb_ac3_chan_map[10][2][8] =
+{
+//     w/o LFE                       w/ LFE
+//     C  L  R LS RS Rls Rrs         L  R  C LS RS Rls Rls LFE
+    {{ 0,                       }, { 1, 0,                     }}, // MONO
+    {{ 0, 1,                    }, { 1, 2, 0,                  }}, // STEREO
+    {{ 1, 0, 2,                 }, { 2, 1, 3, 0,               }}, // 3F
+    {{ 0, 1, 2,                 }, { 1, 2, 3, 0,               }}, // 2F1R
+    {{ 1, 0, 2, 3,              }, { 2, 1, 3, 4, 0,            }}, // 3F1R
+    {{ 0, 1, 2, 3,              }, { 1, 2, 3, 4, 0,            }}, // 2F2R
+    {{ 1, 0, 2, 3, 4,           }, { 2, 1, 3, 4, 5,  0,        }}, // 3F2R
+    {{ 1, 0, 2, 3, 4,  5,  6,   }, { 2, 1, 3, 4, 5,  6,  7,  0 }}, // 3F4R
+    {{ 0, 1,                    }, { 0, 1,                     }}, // DOLBY
+    {{ 0, 1,                    }, { 0, 1,                     }}  // DPLII
+};
+
+int hb_smpte_chan_map[10][2][8] =
+{
+//     w/o LFE                       w/ LFE
+//     L  R  C LS RS Rls Rrs         L  R  C LS RS Rls Rls LFE
+    {{ 0,                       }, { 0, 1,                     }}, // MONO
+    {{ 0, 1,                    }, { 0, 1, 2,                  }}, // STEREO
+    {{ 2, 0, 1,                 }, { 2, 0, 1, 3,               }}, // 3F
+    {{ 0, 1, 2,                 }, { 0, 1, 3, 2,               }}, // 2F1R
+    {{ 2, 0, 1, 3,              }, { 2, 0, 1, 4, 3,            }}, // 3F1R
+    {{ 0, 1, 2, 3,              }, { 0, 1, 3, 4, 2,            }}, // 2F2R
+    {{ 2, 0, 1, 3, 4,           }, { 2, 0, 1, 4, 5,  3,        }}, // 3F2R
+    {{ 2, 0, 1, 5, 6,  3,  4,   }, { 2, 0, 1, 6, 7,  4,  5,  3 }}, // 3F4R
+    {{ 0, 1,                    }, { 0, 1,                     }}, // DOLBY
+    {{ 0, 1,                    }, { 0, 1,                     }}  // DPLII
+};
+static const uint8_t nchans_tbl[] = {1, 2, 3, 3, 4, 4, 5, 7, 2, 2};
+
+// Takes a set of samples and remaps the channel layout
+void hb_layout_remap( int (*layouts)[2][8], hb_sample_t * samples, int layout, int nsamples )
+{
+    int nchans;
+    int ii, jj;
+    int lfe;
+    int * map;
+    int mode;
+    hb_sample_t tmp[6];
+
+    mode = hb_layout_to_mode(layout);
+    lfe = ((mode & DOWNMIX_LFE_FLAG) != 0);
+    mode = mode & DOWNMIX_CHANNEL_MASK;
+    nchans = nchans_tbl[mode] + lfe;
+    map = layouts[mode][lfe];
+
+    for (ii = 0; ii < nsamples; ii++)
+    {
+        for (jj = 0; jj < nchans; jj++)
+        {
+            tmp[jj] = samples[jj];
+        }
+        for (jj = 0; jj < nchans; jj++)
+        {
+            samples[jj] = tmp[map[jj]];
+        }
+        samples += nchans;
+    }
+}
+
+static void matrix_mul(
+    hb_sample_t * dst, 
+    hb_sample_t * src, 
+    int nchans_out, 
+    int nchans_in, 
+    int nsamples, 
+    hb_sample_t (*matrix)[8],
+    hb_sample_t bias)
+{
+    int nn, ii, jj;
+    hb_sample_t val;
+
+    for (nn = 0; nn < nsamples; nn++)
+    {
+        for (ii = 0; ii < nchans_out; ii++)
+        {
+            val = 0;
+            for (jj = 0; jj < nchans_in; jj++)
+            {
+                val += src[jj] * matrix[jj][ii];
+            }
+            dst[ii] = val + bias;
+        }
+        src += nchans_in;
+        dst += nchans_out;
+    }
+}
+
+static void set_level(
+    hb_sample_t (*matrix)[8], 
+    hb_sample_t clev, 
+    hb_sample_t slev, 
+    hb_sample_t level, 
+    int mode_in, 
+    int mode_out)
+{
+    int ii, jj;
+    int spos;
+    int layout_in, layout_out;
+
+    for (ii = 0; ii < 8; ii++)
+    {
+        for (jj = 0; jj < 8; jj++)
+        {
+            matrix[ii][jj] *= level;
+        }
+    }
+    if (mode_out >= DOWNMIX_DOLBY)
+        return;
+
+    spos = 3;
+    layout_in = channel_layout_map[mode_in];
+    layout_out = channel_layout_map[mode_out];
+
+    if (!(layout_in & HB_CH_FRONT_CENTER))
+    {
+        spos--;
+    }
+    else
+    {
+        if (!(layout_out & HB_CH_FRONT_CENTER))
+        {
+            for (jj = 0; jj < 8; jj++)
+            {
+                matrix[0][jj] *= clev;
+            }
+        }
+    }
+    if (layout_in & (HB_CH_BACK_LEFT|HB_CH_BACK_RIGHT|HB_CH_BACK_CENTER|HB_CH_SIDE_LEFT|HB_CH_SIDE_RIGHT))
+    {
+        if (layout_out & (HB_CH_BACK_LEFT|HB_CH_BACK_RIGHT|HB_CH_BACK_CENTER|HB_CH_SIDE_LEFT|HB_CH_SIDE_RIGHT))
+        {
+            // Note, slev only gets set if input has surround, and output has none.
+            return;
+        }
+    }
+    if (layout_in & (HB_CH_SIDE_LEFT|HB_CH_SIDE_RIGHT))
+    {
+        for (jj = 0; jj < 8; jj++)
+        {
+            matrix[spos][jj] *= slev;
+            matrix[spos+1][jj] *= slev;
+        }
+        spos += 2;
+    }
+    else if (layout_in & (HB_CH_BACK_CENTER))
+    {
+        for (jj = 0; jj < 8; jj++)
+        {
+            matrix[spos][jj] *= slev;
+        }
+    }
+    if (layout_in & (HB_CH_BACK_LEFT|HB_CH_BACK_RIGHT))
+    {
+        for (jj = 0; jj < 8; jj++)
+        {
+            matrix[spos][jj] *= slev;
+            matrix[spos+1][jj] *= slev;
+        }
+    }
+}
+
+#define MIXMODE(x,y) (((x)<<4)|(y))
+// The downmix operation can result in new sample values that are
+// outside the original range of sample values.  If you wish to
+// guarantee that the levels to not exceed the original range,
+// call this function after initializing downmix and setting 
+// your initial levels.
+//
+// Note that this can result in generally lower volume levels
+// in the resulting downmixed audio.
+void hb_downmix_adjust_level( hb_downmix_t * downmix )
+{
+    int ii, jj;
+    int mode_in, mode_out;
+    hb_sample_t level = 1.0;
+    hb_sample_t clev = downmix->clev;
+    hb_sample_t slev = downmix->slev;
+
+    mode_in = downmix->mode_in & DOWNMIX_CHANNEL_MASK;
+    mode_out = downmix->mode_out & DOWNMIX_CHANNEL_MASK;
+
+    switch MIXMODE(mode_in, mode_out)
+    {
+    case MIXMODE(DOWNMIX_STEREO, DOWNMIX_MONO):
+    case MIXMODE(DOWNMIX_2F2R, DOWNMIX_2F1R):
+    case MIXMODE(DOWNMIX_2F2R, DOWNMIX_3F1R):
+    case MIXMODE(DOWNMIX_3F2R, DOWNMIX_3F1R):
+    case MIXMODE(DOWNMIX_3F4R, DOWNMIX_3F1R):
+    case MIXMODE(DOWNMIX_3F4R, DOWNMIX_3F2R):
+    level_3db:
+        level /= LVL_PLUS3DB;
+        break;
+
+    case MIXMODE(DOWNMIX_3F, DOWNMIX_MONO):
+        level /= LVL_PLUS3DB + clev * LVL_PLUS3DB;
+        break;
+
+    case MIXMODE(DOWNMIX_3F2R, DOWNMIX_2F1R):
+    case MIXMODE(DOWNMIX_3F4R, DOWNMIX_2F1R):
+    case MIXMODE(DOWNMIX_3F4R, DOWNMIX_2F2R):
+        if (1 + clev < LVL_PLUS3DB)
+            goto level_3db;
+    case MIXMODE(DOWNMIX_3F, DOWNMIX_STEREO):
+    case MIXMODE(DOWNMIX_3F, DOWNMIX_2F1R):
+    case MIXMODE(DOWNMIX_3F, DOWNMIX_2F2R):
+    case MIXMODE(DOWNMIX_3F, DOWNMIX_DOLBY):
+    case MIXMODE(DOWNMIX_3F, DOWNMIX_DPLII):
+    case MIXMODE(DOWNMIX_3F1R, DOWNMIX_2F1R):
+    case MIXMODE(DOWNMIX_3F1R, DOWNMIX_2F2R):
+    case MIXMODE(DOWNMIX_3F2R, DOWNMIX_2F2R):
+        level /= 1 + clev;
+        break;
+
+
+    case MIXMODE(DOWNMIX_2F1R, DOWNMIX_MONO):
+        level /= LVL_PLUS3DB + LVL_3DB * clev;
+        break;
+
+    case MIXMODE(DOWNMIX_2F1R, DOWNMIX_DOLBY):
+        level /= 1 + LVL_3DB;
+        break;
+
+    case MIXMODE(DOWNMIX_2F1R, DOWNMIX_STEREO):
+    case MIXMODE(DOWNMIX_2F1R, DOWNMIX_3F):
+    case MIXMODE(DOWNMIX_3F1R, DOWNMIX_3F):
+        level /= 1 + LVL_3DB * slev;
+        break;
+
+    case MIXMODE(DOWNMIX_3F1R, DOWNMIX_MONO):
+        level /= LVL_PLUS3DB + LVL_PLUS3DB * clev + LVL_3DB * slev;
+        break;
+
+    case MIXMODE(DOWNMIX_3F1R, DOWNMIX_STEREO):
+        level /= 1 + clev + LVL_3DB * slev;
+        break;
+
+    case MIXMODE(DOWNMIX_3F1R, DOWNMIX_DOLBY):
+    case MIXMODE(DOWNMIX_3F1R, DOWNMIX_DPLII):
+    case MIXMODE(DOWNMIX_2F2R, DOWNMIX_DOLBY):
+        level /= 1 + LVL_PLUS3DB;
+        break;
+
+    case MIXMODE(DOWNMIX_2F2R, DOWNMIX_MONO):
+        level /= LVL_PLUS3DB + LVL_PLUS3DB * slev;
+        break;
+
+    case MIXMODE(DOWNMIX_2F2R, DOWNMIX_STEREO):
+    case MIXMODE(DOWNMIX_2F2R, DOWNMIX_3F):
+    case MIXMODE(DOWNMIX_3F2R, DOWNMIX_3F):
+        level /= 1 + slev;
+        break;
+
+    case MIXMODE(DOWNMIX_2F2R, DOWNMIX_DPLII):
+        level /= 1 + LVL_SQRT_1_3 + LVL_SQRT_2_3;
+        break;
+
+    case MIXMODE(DOWNMIX_3F2R, DOWNMIX_MONO):
+    case MIXMODE(DOWNMIX_3F4R, DOWNMIX_MONO):
+        level /= LVL_PLUS3DB + LVL_PLUS3DB * clev * LVL_PLUS3DB * slev;
+        break;
+
+    case MIXMODE(DOWNMIX_3F2R, DOWNMIX_STEREO):
+        level /= 1 + clev + slev;
+        break;
+
+    case MIXMODE(DOWNMIX_3F2R, DOWNMIX_DOLBY):
+        level /= 1 + 3 * LVL_3DB;
+        break;
+
+    case MIXMODE(DOWNMIX_3F2R, DOWNMIX_DPLII):
+        level /= 1 + LVL_3DB + LVL_SQRT_1_3 + LVL_SQRT_2_3;
+        break;
+
+    case MIXMODE(DOWNMIX_3F4R, DOWNMIX_STEREO):
+        level /= 1 + clev + LVL_PLUS3DB * slev;
+        break;
+
+    case MIXMODE(DOWNMIX_3F4R, DOWNMIX_3F):
+        level /= 1 + LVL_PLUS3DB * slev;
+        break;
+
+    case MIXMODE(DOWNMIX_3F4R, DOWNMIX_DOLBY):
+        level /= 1 + 5 * LVL_3DB;
+        break;
+
+    case MIXMODE(DOWNMIX_3F4R, DOWNMIX_DPLII):
+        level /= 1 + LVL_3DB + 2 * LVL_SQRT_1_3 + 2 * LVL_SQRT_2_3;
+    }
+
+    for (ii = 0; ii < 8; ii++)
+    {
+        for (jj = 0; jj < 8; jj++)
+        {
+            downmix->matrix[ii][jj] *= level;
+        }
+    }
+}
+
+void hb_downmix_set_bias( hb_downmix_t * downmix, hb_sample_t bias )
+{
+    downmix->bias = bias;
+}
+
+// Changes the downmix mode if it needs changing after initialization
+int hb_downmix_set_mode( hb_downmix_t * downmix, int layout, int mixdown )
+{
+    int ii, jj;
+    int lfe_in, lfe_out;
+    int mode_in, mode_out;
+    hb_sample_t (*matrix)[8];
+
+    if ( downmix == NULL )
+        return -1;
+
+    mode_in = hb_layout_to_mode(layout);
+    mode_out = hb_mixdown_to_mode(mixdown);
+    downmix->mode_in = mode_in;
+    downmix->mode_out = mode_out;
+
+    mode_in = downmix->mode_in & ~DOWNMIX_FLAGS_MASK;
+    mode_out = downmix->mode_out & ~DOWNMIX_FLAGS_MASK;
+
+    if (mode_in >= DOWNMIX_NUM_MODES || mode_out >= DOWNMIX_NUM_MODES)
+        return -1;
+
+    matrix = downmix_matrix[mode_in][mode_out];
+
+    for (ii = 0; ii < 8; ii++)
+    {
+        for (jj = 0; jj < 8; jj++)
+        {
+            downmix->matrix[ii][jj] = matrix[ii][jj];
+        }
+    }
+
+    lfe_in = ((downmix->mode_in & DOWNMIX_LFE_FLAG) != 0);
+    lfe_out = ((downmix->mode_out & DOWNMIX_LFE_FLAG) != 0);
+
+    downmix->nchans_in = nchans_tbl[mode_in] + lfe_in;
+    downmix->nchans_out = nchans_tbl[mode_out] + lfe_out;
+    return 0;
+}
+
+// Changes the downmix levels if they need changing after initialization
+void hb_downmix_set_level( hb_downmix_t * downmix, hb_sample_t clev, hb_sample_t slev, hb_sample_t level )
+{
+    int ii, jj;
+    int mode_in, mode_out;
+    hb_sample_t (*matrix)[8];
+
+    if ( downmix == NULL )
+        return;
+
+    mode_in = downmix->mode_in & ~DOWNMIX_FLAGS_MASK;
+    mode_out = downmix->mode_out & ~DOWNMIX_FLAGS_MASK;
+
+    if (mode_in >= DOWNMIX_NUM_MODES || mode_out >= DOWNMIX_NUM_MODES)
+        return;
+
+    matrix = downmix_matrix[mode_in][mode_out];
+
+    for (ii = 0; ii < 8; ii++)
+    {
+        for (jj = 0; jj < 8; jj++)
+        {
+            downmix->matrix[ii][jj] = matrix[ii][jj];
+        }
+    }
+    downmix->clev = clev;
+    downmix->slev = slev;
+    downmix->level = level;
+    set_level(downmix->matrix, clev, slev, level, mode_in, mode_out);
+}
+
+hb_downmix_t * hb_downmix_init(int layout, int mixdown)
+{
+    hb_downmix_t * downmix = calloc(1, sizeof(hb_downmix_t));
+    
+    if (downmix == NULL)
+        return NULL;
+    if ( hb_downmix_set_mode( downmix, layout, mixdown ) < 0 )
+    {
+        free( downmix );
+        return NULL;
+    }
+    // Set some good default values
+    downmix->clev = LVL_3DB;
+    downmix->slev = LVL_3DB;
+    downmix->level = 1.0;
+    downmix->bias = 0.0;
+    set_level(downmix->matrix, LVL_3DB, LVL_3DB, 1.0, 
+              downmix->mode_in, downmix->mode_out);
+    return downmix;
+}
+
+void hb_downmix_close( hb_downmix_t **downmix )
+{
+    if (*downmix != NULL)
+        free(*downmix);
+    *downmix = NULL;
+}
+
+void hb_downmix( hb_downmix_t * downmix, hb_sample_t * dst, hb_sample_t * src, int nsamples)
+{
+    matrix_mul(dst, src, downmix->nchans_out, downmix->nchans_in, 
+               nsamples, downmix->matrix, downmix->bias);
+}
+
+int hb_need_downmix( int layout, int mixdown )
+{
+    int mode_in, mode_out;
+
+    mode_in = hb_layout_to_mode(layout);
+    mode_out = hb_mixdown_to_mode(mixdown);
+
+    return (mode_in != mode_out);
+}