--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/gst/audioconvert/audioconvert.h	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,144 @@
+/* GStreamer
+ * Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
+ *
+ * audioconvert.h: audio format conversion library
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __AUDIO_CONVERT_H__
+#define __AUDIO_CONVERT_H__
+
+#include <gst/gst.h>
+#include <gst/audio/multichannel.h>
+
+typedef enum
+{
+  DITHER_NONE = 0,
+  DITHER_RPDF,
+  DITHER_TPDF,
+  DITHER_TPDF_HF
+} DitherType;
+
+typedef enum
+{
+  NOISE_SHAPING_NONE = 0,
+  NOISE_SHAPING_ERROR_FEEDBACK,
+  NOISE_SHAPING_SIMPLE,
+  NOISE_SHAPING_MEDIUM,
+  NOISE_SHAPING_HIGH
+} NoiseShapingType;
+
+typedef struct _AudioConvertCtx AudioConvertCtx;
+typedef struct _AudioConvertFmt AudioConvertFmt;
+
+struct _AudioConvertFmt
+{
+  /* general caps */
+  gboolean is_int;
+  gint endianness;
+  gint width;
+  gint rate;
+  gint channels;
+  GstAudioChannelPosition *pos;
+
+  /* int audio caps */
+  gboolean sign;
+  gint depth;
+
+  gint unit_size;
+};
+
+typedef void (*AudioConvertUnpack) (gpointer src, gpointer dst, gint scale,
+    gint count);
+typedef void (*AudioConvertPack) (gpointer src, gpointer dst, gint scale,
+    gint count);
+
+typedef void (*AudioConvertMix) (AudioConvertCtx *, gpointer, gpointer, gint);
+typedef void (*AudioConvertQuantize) (AudioConvertCtx * ctx, gpointer src,
+    gpointer dst, gint count);
+
+struct _AudioConvertCtx
+{
+  AudioConvertFmt in;
+  AudioConvertFmt out;
+
+  AudioConvertUnpack unpack;
+  AudioConvertPack pack;
+
+  /* channel conversion matrix, m[in_channels][out_channels].
+   * If identity matrix, passthrough applies. */
+  gfloat **matrix;
+  /* temp storage for channelmix */
+  gpointer tmp;
+
+  gboolean in_default;
+  gboolean mix_passthrough;
+  gboolean out_default;
+
+  gpointer tmpbuf;
+  gint tmpbufsize;
+
+  gint in_scale;
+  gint out_scale;
+
+  AudioConvertMix channel_mix;
+
+  AudioConvertQuantize quantize;
+  DitherType dither;
+  NoiseShapingType ns;
+  /* random number generate for dither noise */
+  GRand *dither_random;
+  /* last random number generated per channel for hifreq TPDF dither */
+  gpointer last_random;
+  /* contains the past quantization errors, error[out_channels][count] */
+  gdouble *error_buf;
+};
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+
+gboolean audio_convert_clean_fmt (AudioConvertFmt * fmt);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+
+gboolean audio_convert_prepare_context (AudioConvertCtx * ctx,
+    AudioConvertFmt * in, AudioConvertFmt * out, DitherType dither,
+    NoiseShapingType ns);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean audio_convert_get_sizes (AudioConvertCtx * ctx, gint samples,
+    gint * srcsize, gint * dstsize);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+
+gboolean audio_convert_clean_context (AudioConvertCtx * ctx);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+
+gboolean audio_convert_convert (AudioConvertCtx * ctx, gpointer src,
+    gpointer dst, gint samples, gboolean src_writable);
+
+#endif /* __AUDIO_CONVERT_H__ */