1 files changed, 84 insertions, 0 deletions
diff --git a/include/gst/audio/audio-channel-mixer.h b/include/gst/audio/audio-channel-mixer.h
new file mode 100644
index 0000000000..35c2f6d83f
--- /dev/null
+++ b/include/gst/audio/audio-channel-mixer.h
@@ -0,0 +1,84 @@
+/* GStreamer
+ * Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
+ *           (C) 2015 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * audio-channel-mixer.h: setup of channel conversion matrices
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_AUDIO_CHANNEL_MIXER_H__
+#define __GST_AUDIO_CHANNEL_MIXER_H__
+
+#include <gst/gst.h>
+#include <gst/audio/audio.h>
+
+typedef struct _GstAudioChannelMixer GstAudioChannelMixer;
+
+/**
+ * GstAudioChannelMixerFlags:
+ * @GST_AUDIO_CHANNEL_MIXER_FLAGS_NONE: no flag
+ * @GST_AUDIO_CHANNEL_MIXER_FLAGS_NON_INTERLEAVED_IN: input channels are not interleaved
+ * @GST_AUDIO_CHANNEL_MIXER_FLAGS_NON_INTERLEAVED_OUT: output channels are not interleaved
+ * @GST_AUDIO_CHANNEL_MIXER_FLAGS_UNPOSITIONED_IN: input channels are explicitly unpositioned
+ * @GST_AUDIO_CHANNEL_MIXER_FLAGS_UNPOSITIONED_OUT: output channels are explicitly unpositioned
+ *
+ * Flags passed to gst_audio_channel_mixer_new()
+ */
+typedef enum {
+  GST_AUDIO_CHANNEL_MIXER_FLAGS_NONE                = 0,
+  GST_AUDIO_CHANNEL_MIXER_FLAGS_NON_INTERLEAVED_IN  = (1 << 0),
+  GST_AUDIO_CHANNEL_MIXER_FLAGS_NON_INTERLEAVED_OUT = (1 << 1),
+  GST_AUDIO_CHANNEL_MIXER_FLAGS_UNPOSITIONED_IN     = (1 << 2),
+  GST_AUDIO_CHANNEL_MIXER_FLAGS_UNPOSITIONED_OUT    = (1 << 3)
+} GstAudioChannelMixerFlags;
+
+GST_AUDIO_API
+GstAudioChannelMixer * gst_audio_channel_mixer_new   (GstAudioChannelMixerFlags flags,
+                                                      GstAudioFormat format,
+                                                      gint in_channels,
+                                                      GstAudioChannelPosition *in_position,
+                                                      gint out_channels,
+                                                      GstAudioChannelPosition *out_position);
+
+GST_AUDIO_API
+GstAudioChannelMixer * gst_audio_channel_mixer_new_with_matrix (GstAudioChannelMixerFlags flags,
+                                                                GstAudioFormat format,
+                                                                gint in_channels,
+                                                                gint out_channels,
+                                                                gfloat **matrix);
+
+GST_AUDIO_API
+void                   gst_audio_channel_mixer_free  (GstAudioChannelMixer *mix);
+
+/*
+ * Checks for passthrough (= identity matrix).
+ */
+
+GST_AUDIO_API
+gboolean        gst_audio_channel_mixer_is_passthrough  (GstAudioChannelMixer *mix);
+
+/*
+ * Do actual mixing.
+ */
+
+GST_AUDIO_API
+void            gst_audio_channel_mixer_samples   (GstAudioChannelMixer * mix,
+                                                   const gpointer         in[],
+                                                   gpointer               out[],
+                                                   gint                   samples);
+
+#endif /* __GST_AUDIO_CHANNEL_MIXER_H__ */