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diff --git a/libopus/src/opus_private.h b/libopus/src/opus_private.h
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+/* Copyright (c) 2012 Xiph.Org Foundation
+   Written by Jean-Marc Valin */
+/*
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+   - Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+   - Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef OPUS_PRIVATE_H
+#define OPUS_PRIVATE_H
+
+#include "../celt/arch.h"
+#include "opus.h"
+#include "../celt/celt.h"
+
+#include <stdarg.h> /* va_list */
+#include <stddef.h> /* offsetof */
+
+struct OpusRepacketizer {
+   unsigned char toc;
+   int nb_frames;
+   const unsigned char *frames[48];
+   opus_int16 len[48];
+   int framesize;
+};
+
+typedef struct ChannelLayout {
+   int nb_channels;
+   int nb_streams;
+   int nb_coupled_streams;
+   unsigned char mapping[256];
+} ChannelLayout;
+
+typedef enum {
+  MAPPING_TYPE_NONE,
+  MAPPING_TYPE_SURROUND,
+  MAPPING_TYPE_AMBISONICS
+} MappingType;
+
+struct OpusMSEncoder {
+   ChannelLayout layout;
+   int arch;
+   int lfe_stream;
+   int application;
+   int variable_duration;
+   MappingType mapping_type;
+   opus_int32 bitrate_bps;
+   /* Encoder states go here */
+   /* then opus_val32 window_mem[channels*120]; */
+   /* then opus_val32 preemph_mem[channels]; */
+};
+
+struct OpusMSDecoder {
+   ChannelLayout layout;
+   /* Decoder states go here */
+};
+
+int opus_multistream_encoder_ctl_va_list(struct OpusMSEncoder *st, int request,
+  va_list ap);
+int opus_multistream_decoder_ctl_va_list(struct OpusMSDecoder *st, int request,
+  va_list ap);
+
+int validate_layout(const ChannelLayout *layout);
+int get_left_channel(const ChannelLayout *layout, int stream_id, int prev);
+int get_right_channel(const ChannelLayout *layout, int stream_id, int prev);
+int get_mono_channel(const ChannelLayout *layout, int stream_id, int prev);
+
+typedef void (*opus_copy_channel_in_func)(
+  opus_val16 *dst,
+  int dst_stride,
+  const void *src,
+  int src_stride,
+  int src_channel,
+  int frame_size,
+  void *user_data
+);
+
+typedef void (*opus_copy_channel_out_func)(
+  void *dst,
+  int dst_stride,
+  int dst_channel,
+  const opus_val16 *src,
+  int src_stride,
+  int frame_size,
+  void *user_data
+);
+
+#define MODE_SILK_ONLY          1000
+#define MODE_HYBRID             1001
+#define MODE_CELT_ONLY          1002
+
+#define OPUS_SET_VOICE_RATIO_REQUEST         11018
+#define OPUS_GET_VOICE_RATIO_REQUEST         11019
+
+/** Configures the encoder's expected percentage of voice
+  * opposed to music or other signals.
+  *
+  * @note This interface is currently more aspiration than actuality. It's
+  * ultimately expected to bias an automatic signal classifier, but it currently
+  * just shifts the static bitrate to mode mapping around a little bit.
+  *
+  * @param[in] x <tt>int</tt>:   Voice percentage in the range 0-100, inclusive.
+  * @hideinitializer */
+#define OPUS_SET_VOICE_RATIO(x) OPUS_SET_VOICE_RATIO_REQUEST, __opus_check_int(x)
+/** Gets the encoder's configured voice ratio value, @see OPUS_SET_VOICE_RATIO
+  *
+  * @param[out] x <tt>int*</tt>:  Voice percentage in the range 0-100, inclusive.
+  * @hideinitializer */
+#define OPUS_GET_VOICE_RATIO(x) OPUS_GET_VOICE_RATIO_REQUEST, __opus_check_int_ptr(x)
+
+
+#define OPUS_SET_FORCE_MODE_REQUEST    11002
+#define OPUS_SET_FORCE_MODE(x) OPUS_SET_FORCE_MODE_REQUEST, __opus_check_int(x)
+
+typedef void (*downmix_func)(const void *, opus_val32 *, int, int, int, int, int);
+void downmix_float(const void *_x, opus_val32 *sub, int subframe, int offset, int c1, int c2, int C);
+void downmix_int(const void *_x, opus_val32 *sub, int subframe, int offset, int c1, int c2, int C);
+int is_digital_silence(const opus_val16* pcm, int frame_size, int channels, int lsb_depth);
+
+int encode_size(int size, unsigned char *data);
+
+opus_int32 frame_size_select(opus_int32 frame_size, int variable_duration, opus_int32 Fs);
+
+opus_int32 opus_encode_native(OpusEncoder *st, const opus_val16 *pcm, int frame_size,
+      unsigned char *data, opus_int32 out_data_bytes, int lsb_depth,
+      const void *analysis_pcm, opus_int32 analysis_size, int c1, int c2,
+      int analysis_channels, downmix_func downmix, int float_api);
+
+int opus_decode_native(OpusDecoder *st, const unsigned char *data, opus_int32 len,
+      opus_val16 *pcm, int frame_size, int decode_fec, int self_delimited,
+      opus_int32 *packet_offset, int soft_clip);
+
+/* Make sure everything is properly aligned. */
+static OPUS_INLINE int align(int i)
+{
+    struct foo {char c; union { void* p; opus_int32 i; opus_val32 v; } u;};
+
+    unsigned int alignment = offsetof(struct foo, u);
+
+    /* Optimizing compilers should optimize div and multiply into and
+       for all sensible alignment values. */
+    return ((i + alignment - 1) / alignment) * alignment;
+}
+
+int opus_packet_parse_impl(const unsigned char *data, opus_int32 len,
+      int self_delimited, unsigned char *out_toc,
+      const unsigned char *frames[48], opus_int16 size[48],
+      int *payload_offset, opus_int32 *packet_offset);
+
+opus_int32 opus_repacketizer_out_range_impl(OpusRepacketizer *rp, int begin, int end,
+      unsigned char *data, opus_int32 maxlen, int self_delimited, int pad);
+
+int pad_frame(unsigned char *data, opus_int32 len, opus_int32 new_len);
+
+int opus_multistream_encode_native
+(
+  struct OpusMSEncoder *st,
+  opus_copy_channel_in_func copy_channel_in,
+  const void *pcm,
+  int analysis_frame_size,
+  unsigned char *data,
+  opus_int32 max_data_bytes,
+  int lsb_depth,
+  downmix_func downmix,
+  int float_api,
+  void *user_data
+);
+
+int opus_multistream_decode_native(
+  struct OpusMSDecoder *st,
+  const unsigned char *data,
+  opus_int32 len,
+  void *pcm,
+  opus_copy_channel_out_func copy_channel_out,
+  int frame_size,
+  int decode_fec,
+  int soft_clip,
+  void *user_data
+);
+
+#endif /* OPUS_PRIVATE_H */