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diff --git a/ffmpeg/libavformat/audiointerleave.h b/ffmpeg/libavformat/audiointerleave.h
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+/*
+ * audio interleaving prototypes and declarations
+ *
+ * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_AUDIOINTERLEAVE_H
+#define AVFORMAT_AUDIOINTERLEAVE_H
+
+#include "libavutil/fifo.h"
+#include "avformat.h"
+
+typedef struct AudioInterleaveContext {
+    AVFifoBuffer *fifo;
+    unsigned fifo_size;           ///< size of currently allocated FIFO
+    uint64_t dts;                 ///< current dts
+    int sample_size;              ///< size of one sample all channels included
+    const int *samples_per_frame; ///< must be 0-terminated
+    const int *samples;           ///< current samples per frame, pointer to samples_per_frame
+    AVRational time_base;         ///< time base of output audio packets
+} AudioInterleaveContext;
+
+int ff_audio_interleave_init(AVFormatContext *s, const int *samples_per_frame, AVRational time_base);
+void ff_audio_interleave_close(AVFormatContext *s);
+
+/**
+ * Rechunk audio PCM packets per AudioInterleaveContext->samples_per_frame
+ * and interleave them correctly.
+ * The first element of AVStream->priv_data must be AudioInterleaveContext
+ * when using this function.
+ *
+ * @param get_packet function will output a packet when streams are correctly interleaved.
+ * @param compare_ts function will compare AVPackets and decide interleaving order.
+ */
+int ff_audio_rechunk_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush,
+                        int (*get_packet)(AVFormatContext *, AVPacket *, AVPacket *, int),
+                        int (*compare_ts)(AVFormatContext *, AVPacket *, AVPacket *));
+
+#endif /* AVFORMAT_AUDIOINTERLEAVE_H */