diff -r 4c282e7dd6d3 -r 5505e8908944 gst_plugins_base/gst/audioconvert/audioconvert.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/gst/audioconvert/audioconvert.c	Fri Jan 22 09:59:59 2010 +0200
@@ -0,0 +1,617 @@
+/* GStreamer
+ * Copyright (C) 2005 Wim Taymans <wim at fluendo dot com>
+ *
+ * audioconvert.c: Convert audio to different audio formats automatically
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <math.h>
+#include <string.h>
+
+#include "gstchannelmix.h"
+#include "gstaudioquantize.h"
+#include "audioconvert.h"
+#include "gst/floatcast/floatcast.h"
+
+/* sign bit in the intermediate format */
+#define SIGNED  (1U<<31)
+
+/*** 
+ * unpack code
+ */
+#define MAKE_UNPACK_FUNC_NAME(name)                                     \
+audio_convert_unpack_##name
+
+/* unpack from integer to signed integer 32 */
+#define MAKE_UNPACK_FUNC_II(name, stride, sign, READ_FUNC)              \
+static void                                                             \
+MAKE_UNPACK_FUNC_NAME (name) (guint8 *src, gint32 *dst,                 \
+        gint scale, gint count)                                         \
+{                                                                       \
+  for (;count; count--) {                                               \
+    *dst++ = (((gint32) READ_FUNC (src)) << scale) ^ (sign);            \
+    src+=stride;                                                        \
+  }                                                                     \
+}
+
+/* unpack from float to signed integer 32 */
+#define MAKE_UNPACK_FUNC_FI(name, type, READ_FUNC)                            \
+static void                                                                   \
+MAKE_UNPACK_FUNC_NAME (name) (type * src, gint32 * dst, gint s, gint count)   \
+{                                                                             \
+  gdouble temp;                                                               \
+                                                                              \
+  for (; count; count--) {                                                    \
+    /* blow up to 32 bit */                                                   \
+    temp = floor ((READ_FUNC (*src++) * 2147483647.0) + 0.5);                 \
+    *dst++ = (gint32) CLAMP (temp, G_MININT32, G_MAXINT32);                   \
+  }                                                                           \
+}
+
+
+/* unpack from float to float 64 (double) */
+#define MAKE_UNPACK_FUNC_FF(name, type, FUNC)                                 \
+static void                                                                   \
+MAKE_UNPACK_FUNC_NAME (name) (type * src, gdouble * dst, gint s,              \
+    gint count)                                                               \
+{                                                                             \
+  for (; count; count--)                                                      \
+    *dst++ = (gdouble) FUNC (*src++);                                         \
+}
+
+/* unpack from int to float 64 (double) */
+#define MAKE_UNPACK_FUNC_IF(name, stride, sign, READ_FUNC)                    \
+static void                                                                   \
+MAKE_UNPACK_FUNC_NAME (name) (guint8 * src, gdouble * dst, gint scale,        \
+    gint count)                                                               \
+{                                                                             \
+  gdouble tmp;                                                                \
+  for (; count; count--) {                                                    \
+    tmp = (gdouble) ((((gint32) READ_FUNC (src)) << scale) ^ (sign));         \
+    *dst++ = tmp * (1.0 / 2147483647.0);                                      \
+    src += stride;                                                            \
+  }                                                                           \
+}
+
+#define READ8(p)          GST_READ_UINT8(p)
+#define READ16_FROM_LE(p) GST_READ_UINT16_LE (p)
+#define READ16_FROM_BE(p) GST_READ_UINT16_BE (p)
+#define READ24_FROM_LE(p) (p[0] | (p[1] << 8) | (p[2] << 16))
+#define READ24_FROM_BE(p) (p[2] | (p[1] << 8) | (p[0] << 16))
+#define READ32_FROM_LE(p) GST_READ_UINT32_LE (p)
+#define READ32_FROM_BE(p) GST_READ_UINT32_BE (p)
+
+MAKE_UNPACK_FUNC_II (u8, 1, SIGNED, READ8);
+MAKE_UNPACK_FUNC_II (s8, 1, 0, READ8);
+MAKE_UNPACK_FUNC_II (u16_le, 2, SIGNED, READ16_FROM_LE);
+MAKE_UNPACK_FUNC_II (s16_le, 2, 0, READ16_FROM_LE);
+MAKE_UNPACK_FUNC_II (u16_be, 2, SIGNED, READ16_FROM_BE);
+MAKE_UNPACK_FUNC_II (s16_be, 2, 0, READ16_FROM_BE);
+MAKE_UNPACK_FUNC_II (u24_le, 3, SIGNED, READ24_FROM_LE);
+MAKE_UNPACK_FUNC_II (s24_le, 3, 0, READ24_FROM_LE);
+MAKE_UNPACK_FUNC_II (u24_be, 3, SIGNED, READ24_FROM_BE);
+MAKE_UNPACK_FUNC_II (s24_be, 3, 0, READ24_FROM_BE);
+MAKE_UNPACK_FUNC_II (u32_le, 4, SIGNED, READ32_FROM_LE);
+MAKE_UNPACK_FUNC_II (s32_le, 4, 0, READ32_FROM_LE);
+MAKE_UNPACK_FUNC_II (u32_be, 4, SIGNED, READ32_FROM_BE);
+MAKE_UNPACK_FUNC_II (s32_be, 4, 0, READ32_FROM_BE);
+MAKE_UNPACK_FUNC_FI (float_le, gfloat, GFLOAT_FROM_LE);
+MAKE_UNPACK_FUNC_FI (float_be, gfloat, GFLOAT_FROM_BE);
+MAKE_UNPACK_FUNC_FI (double_le, gdouble, GDOUBLE_FROM_LE);
+MAKE_UNPACK_FUNC_FI (double_be, gdouble, GDOUBLE_FROM_BE);
+MAKE_UNPACK_FUNC_FF (float_hq_le, gfloat, GFLOAT_FROM_LE);
+MAKE_UNPACK_FUNC_FF (float_hq_be, gfloat, GFLOAT_FROM_BE);
+MAKE_UNPACK_FUNC_FF (double_hq_le, gdouble, GDOUBLE_FROM_LE);
+MAKE_UNPACK_FUNC_FF (double_hq_be, gdouble, GDOUBLE_FROM_BE);
+MAKE_UNPACK_FUNC_IF (u8_float, 1, SIGNED, READ8);
+MAKE_UNPACK_FUNC_IF (s8_float, 1, 0, READ8);
+MAKE_UNPACK_FUNC_IF (u16_le_float, 2, SIGNED, READ16_FROM_LE);
+MAKE_UNPACK_FUNC_IF (s16_le_float, 2, 0, READ16_FROM_LE);
+MAKE_UNPACK_FUNC_IF (u16_be_float, 2, SIGNED, READ16_FROM_BE);
+MAKE_UNPACK_FUNC_IF (s16_be_float, 2, 0, READ16_FROM_BE);
+MAKE_UNPACK_FUNC_IF (u24_le_float, 3, SIGNED, READ24_FROM_LE);
+MAKE_UNPACK_FUNC_IF (s24_le_float, 3, 0, READ24_FROM_LE);
+MAKE_UNPACK_FUNC_IF (u24_be_float, 3, SIGNED, READ24_FROM_BE);
+MAKE_UNPACK_FUNC_IF (s24_be_float, 3, 0, READ24_FROM_BE);
+MAKE_UNPACK_FUNC_IF (u32_le_float, 4, SIGNED, READ32_FROM_LE);
+MAKE_UNPACK_FUNC_IF (s32_le_float, 4, 0, READ32_FROM_LE);
+MAKE_UNPACK_FUNC_IF (u32_be_float, 4, SIGNED, READ32_FROM_BE);
+MAKE_UNPACK_FUNC_IF (s32_be_float, 4, 0, READ32_FROM_BE);
+
+/* One of the double_hq_* functions generated above is ineffecient, but it's
+ * never used anyway.  The same is true for one of the s32_* functions. */
+
+/*** 
+ * packing code
+ */
+#define MAKE_PACK_FUNC_NAME(name)                                       \
+audio_convert_pack_##name
+
+/*
+ * These functions convert the signed 32 bit integers to the
+ * target format. For this to work the following steps are done:
+ *
+ * 1) If the output format is unsigned we will XOR the sign bit. This
+ *    will do the same as if we add 1<<31.
+ * 2) Afterwards we shift to the target depth. It's necessary to left-shift
+ *    on signed values here to get arithmetical shifting.
+ * 3) This is then written into our target array by the corresponding write
+ *    function for the target width.
+ */
+
+/* pack from signed integer 32 to integer */
+#define MAKE_PACK_FUNC_II(name, stride, sign, WRITE_FUNC)               \
+static void                                                             \
+MAKE_PACK_FUNC_NAME (name) (gint32 *src, guint8 * dst,                  \
+        gint scale, gint count)                                         \
+{                                                                       \
+  gint32 tmp;                                                           \
+  for (;count; count--) {                                               \
+    tmp = (*src++ ^ (sign)) >> scale;                                   \
+    WRITE_FUNC (dst, tmp);                                              \
+    dst += stride;                                                      \
+  }                                                                     \
+}
+
+/* pack from signed integer 32 to float */
+#define MAKE_PACK_FUNC_IF(name, type, FUNC)                             \
+static void                                                             \
+MAKE_PACK_FUNC_NAME (name) (gint32 * src, type * dst, gint scale,       \
+    gint count)                                                         \
+{                                                                       \
+  for (; count; count--)                                                \
+    *dst++ = FUNC ((type) ((*src++) * (1.0 / 2147483647.0)));           \
+}
+
+/* pack from float 64 (double) to float */
+#define MAKE_PACK_FUNC_FF(name, type, FUNC)                             \
+static void                                                             \
+MAKE_PACK_FUNC_NAME (name) (gdouble * src, type * dst, gint s,          \
+    gint count)                                                         \
+{                                                                       \
+  for (; count; count--)                                                \
+    *dst++ = FUNC ((type) (*src++));                                    \
+}
+
+/* pack from float 64 (double) to signed int.
+ * the floats are already in the correct range. Only a cast is needed.
+ */
+#define MAKE_PACK_FUNC_FI_S(name, stride, WRITE_FUNC)                   \
+static void                                                             \
+MAKE_PACK_FUNC_NAME (name) (gdouble * src, guint8 * dst, gint scale,    \
+    gint count)                                                         \
+{                                                                       \
+  gint32 tmp;                                                           \
+  for (; count; count--) {                                              \
+    tmp = (gint32) (*src);                                              \
+    WRITE_FUNC (dst, tmp);                                              \
+    src++;                                                              \
+    dst += stride;                                                      \
+  }                                                                     \
+}
+
+/* pack from float 64 (double) to unsigned int.
+ * the floats are already in the correct range. Only a cast is needed
+ * and an addition of 2^(target_depth-1) to get in the correct unsigned
+ * range. */
+#define MAKE_PACK_FUNC_FI_U(name, stride, WRITE_FUNC)                   \
+static void                                                             \
+MAKE_PACK_FUNC_NAME (name) (gdouble * src, guint8 * dst, gint scale,    \
+    gint count)                                                         \
+{                                                                       \
+  guint32 tmp;                                                          \
+  gdouble limit = (1U<<(32-scale-1));                                   \
+  for (; count; count--) {                                              \
+    tmp = (guint32) (*src + limit);                                     \
+    WRITE_FUNC (dst, tmp);                                              \
+    src++;                                                              \
+    dst += stride;                                                      \
+  }                                                                     \
+}
+
+#define WRITE8(p, v)       GST_WRITE_UINT8 (p, v)
+#define WRITE16_TO_LE(p,v) GST_WRITE_UINT16_LE (p, (guint16)(v))
+#define WRITE16_TO_BE(p,v) GST_WRITE_UINT16_BE (p, (guint16)(v))
+#define WRITE24_TO_LE(p,v) p[0] = v & 0xff; p[1] = (v >> 8) & 0xff; p[2] = (v >> 16) & 0xff
+#define WRITE24_TO_BE(p,v) p[2] = v & 0xff; p[1] = (v >> 8) & 0xff; p[0] = (v >> 16) & 0xff
+#define WRITE32_TO_LE(p,v) GST_WRITE_UINT32_LE (p, (guint32)(v))
+#define WRITE32_TO_BE(p,v) GST_WRITE_UINT32_BE (p, (guint32)(v))
+
+MAKE_PACK_FUNC_II (u8, 1, SIGNED, WRITE8);
+MAKE_PACK_FUNC_II (s8, 1, 0, WRITE8);
+MAKE_PACK_FUNC_II (u16_le, 2, SIGNED, WRITE16_TO_LE);
+MAKE_PACK_FUNC_II (s16_le, 2, 0, WRITE16_TO_LE);
+MAKE_PACK_FUNC_II (u16_be, 2, SIGNED, WRITE16_TO_BE);
+MAKE_PACK_FUNC_II (s16_be, 2, 0, WRITE16_TO_BE);
+MAKE_PACK_FUNC_II (u24_le, 3, SIGNED, WRITE24_TO_LE);
+MAKE_PACK_FUNC_II (s24_le, 3, 0, WRITE24_TO_LE);
+MAKE_PACK_FUNC_II (u24_be, 3, SIGNED, WRITE24_TO_BE);
+MAKE_PACK_FUNC_II (s24_be, 3, 0, WRITE24_TO_BE);
+MAKE_PACK_FUNC_II (u32_le, 4, SIGNED, WRITE32_TO_LE);
+MAKE_PACK_FUNC_II (s32_le, 4, 0, WRITE32_TO_LE);
+MAKE_PACK_FUNC_II (u32_be, 4, SIGNED, WRITE32_TO_BE);
+MAKE_PACK_FUNC_II (s32_be, 4, 0, WRITE32_TO_BE);
+MAKE_PACK_FUNC_IF (float_le, gfloat, GFLOAT_TO_LE);
+MAKE_PACK_FUNC_IF (float_be, gfloat, GFLOAT_TO_BE);
+MAKE_PACK_FUNC_IF (double_le, gdouble, GDOUBLE_TO_LE);
+MAKE_PACK_FUNC_IF (double_be, gdouble, GDOUBLE_TO_BE);
+MAKE_PACK_FUNC_FF (float_hq_le, gfloat, GFLOAT_TO_LE);
+MAKE_PACK_FUNC_FF (float_hq_be, gfloat, GFLOAT_TO_BE);
+MAKE_PACK_FUNC_FI_U (u8_float, 1, WRITE8);
+MAKE_PACK_FUNC_FI_S (s8_float, 1, WRITE8);
+MAKE_PACK_FUNC_FI_U (u16_le_float, 2, WRITE16_TO_LE);
+MAKE_PACK_FUNC_FI_S (s16_le_float, 2, WRITE16_TO_LE);
+MAKE_PACK_FUNC_FI_U (u16_be_float, 2, WRITE16_TO_BE);
+MAKE_PACK_FUNC_FI_S (s16_be_float, 2, WRITE16_TO_BE);
+MAKE_PACK_FUNC_FI_U (u24_le_float, 3, WRITE24_TO_LE);
+MAKE_PACK_FUNC_FI_S (s24_le_float, 3, WRITE24_TO_LE);
+MAKE_PACK_FUNC_FI_U (u24_be_float, 3, WRITE24_TO_BE);
+MAKE_PACK_FUNC_FI_S (s24_be_float, 3, WRITE24_TO_BE);
+MAKE_PACK_FUNC_FI_U (u32_le_float, 4, WRITE32_TO_LE);
+MAKE_PACK_FUNC_FI_S (s32_le_float, 4, WRITE32_TO_LE);
+MAKE_PACK_FUNC_FI_U (u32_be_float, 4, WRITE32_TO_BE);
+MAKE_PACK_FUNC_FI_S (s32_be_float, 4, WRITE32_TO_BE);
+
+/* For double_hq, packing and unpacking is the same, so we reuse the unpacking
+ * functions here. */
+#define audio_convert_pack_double_hq_le MAKE_UNPACK_FUNC_NAME (double_hq_le)
+#define audio_convert_pack_double_hq_be MAKE_UNPACK_FUNC_NAME (double_hq_be)
+
+static AudioConvertUnpack unpack_funcs[] = {
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u8),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s8),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u8),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s8),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u16_le),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s16_le),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u16_be),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s16_be),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u24_le),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s24_le),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u24_be),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s24_be),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u32_le),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s32_le),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u32_be),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s32_be),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (float_le),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (float_be),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (double_le),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (double_be),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (float_hq_le),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (float_hq_be),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (double_hq_le),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (double_hq_be),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u8_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s8_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u8_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s8_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u16_le_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s16_le_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u16_be_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s16_be_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u24_le_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s24_le_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u24_be_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s24_be_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u32_le_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s32_le_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (u32_be_float),
+  (AudioConvertUnpack) MAKE_UNPACK_FUNC_NAME (s32_be_float),
+};
+
+static AudioConvertPack pack_funcs[] = {
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u8),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s8),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u8),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s8),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u16_le),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s16_le),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u16_be),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s16_be),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u24_le),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s24_le),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u24_be),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s24_be),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u32_le),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s32_le),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u32_be),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s32_be),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (float_le),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (float_be),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (double_le),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (double_be),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (float_hq_le),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (float_hq_be),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (double_hq_le),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (double_hq_be),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u8_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s8_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u8_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s8_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u16_le_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s16_le_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u16_be_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s16_be_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u24_le_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s24_le_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u24_be_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s24_be_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u32_le_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s32_le_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (u32_be_float),
+  (AudioConvertPack) MAKE_PACK_FUNC_NAME (s32_be_float),
+};
+
+#define DOUBLE_INTERMEDIATE_FORMAT(ctx)                                 \
+    ((!ctx->in.is_int && !ctx->out.is_int) || (ctx->ns != NOISE_SHAPING_NONE))
+
+static gint
+audio_convert_get_func_index (AudioConvertCtx * ctx, AudioConvertFmt * fmt)
+{
+  gint index = 0;
+
+  if (fmt->is_int) {
+    index += (fmt->width / 8 - 1) * 4;
+    index += fmt->endianness == G_LITTLE_ENDIAN ? 0 : 2;
+    index += fmt->sign ? 1 : 0;
+    index += (ctx->ns == NOISE_SHAPING_NONE) ? 0 : 24;
+  } else {
+    /* this is float/double */
+    index = 16;
+    index += (fmt->width == 32) ? 0 : 2;
+    index += (fmt->endianness == G_LITTLE_ENDIAN) ? 0 : 1;
+    index += (DOUBLE_INTERMEDIATE_FORMAT (ctx)) ? 4 : 0;
+  }
+
+  return index;
+}
+
+static inline gboolean
+check_default (AudioConvertCtx * ctx, AudioConvertFmt * fmt)
+{
+  if (!DOUBLE_INTERMEDIATE_FORMAT (ctx)) {
+    return (fmt->width == 32 && fmt->depth == 32 &&
+        fmt->endianness == G_BYTE_ORDER && fmt->sign == TRUE);
+  } else {
+    return (fmt->width == 64 && fmt->endianness == G_BYTE_ORDER);
+  }
+}
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+gboolean
+audio_convert_clean_fmt (AudioConvertFmt * fmt)
+{
+  g_return_val_if_fail (fmt != NULL, FALSE);
+
+  g_free (fmt->pos);
+  fmt->pos = NULL;
+
+  return TRUE;
+}
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+
+gboolean
+audio_convert_prepare_context (AudioConvertCtx * ctx, AudioConvertFmt * in,
+    AudioConvertFmt * out, DitherType dither, NoiseShapingType ns)
+{
+  gint idx_in, idx_out;
+
+  g_return_val_if_fail (ctx != NULL, FALSE);
+  g_return_val_if_fail (in != NULL, FALSE);
+  g_return_val_if_fail (out != NULL, FALSE);
+
+  /* first clean the existing context */
+  audio_convert_clean_context (ctx);
+
+  ctx->in = *in;
+  ctx->out = *out;
+
+  /* Don't dither or apply noise shaping if out depth is bigger than 20 bits
+   * as DA converters only can do a SNR up to 20 bits in reality.
+   * Also don't dither or apply noise shaping if target depth is larger than
+   * source depth. */
+  if (ctx->out.depth <= 20 && (!ctx->in.is_int
+          || ctx->in.depth >= ctx->out.depth)) {
+    ctx->dither = dither;
+    ctx->ns = ns;
+  } else {
+    ctx->dither = DITHER_NONE;
+    ctx->ns = NOISE_SHAPING_NONE;
+  }
+
+  /* Use simple error feedback when output sample rate is smaller than
+   * 32000 as the other methods might move the noise to audible ranges */
+  if (ctx->ns > NOISE_SHAPING_ERROR_FEEDBACK && ctx->out.rate < 32000)
+    ctx->ns = NOISE_SHAPING_ERROR_FEEDBACK;
+
+  gst_channel_mix_setup_matrix (ctx);
+
+  idx_in = audio_convert_get_func_index (ctx, in);
+  ctx->unpack = unpack_funcs[idx_in];
+
+  idx_out = audio_convert_get_func_index (ctx, out);
+  ctx->pack = pack_funcs[idx_out];
+
+  /* if both formats are float/double or we use noise shaping use double as
+   * intermediate format and and switch mixing */
+  if (!DOUBLE_INTERMEDIATE_FORMAT (ctx)) {
+    GST_INFO ("use int mixing");
+    ctx->channel_mix = (AudioConvertMix) gst_channel_mix_mix_int;
+  } else {
+    GST_INFO ("use float mixing");
+    ctx->channel_mix = (AudioConvertMix) gst_channel_mix_mix_float;
+  }
+  GST_INFO ("unitsizes: %d -> %d", in->unit_size, out->unit_size);
+
+  /* check if input is in default format */
+  ctx->in_default = check_default (ctx, in);
+  /* check if channel mixer is passthrough */
+  ctx->mix_passthrough = gst_channel_mix_passthrough (ctx);
+  /* check if output is in default format */
+  ctx->out_default = check_default (ctx, out);
+
+  GST_INFO ("in default %d, mix passthrough %d, out default %d",
+      ctx->in_default, ctx->mix_passthrough, ctx->out_default);
+
+  ctx->in_scale = (in->is_int) ? (32 - in->depth) : 0;
+  ctx->out_scale = (out->is_int) ? (32 - out->depth) : 0;
+
+  gst_audio_quantize_setup (ctx);
+
+  return TRUE;
+}
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+gboolean
+audio_convert_clean_context (AudioConvertCtx * ctx)
+{
+  g_return_val_if_fail (ctx != NULL, FALSE);
+
+  gst_audio_quantize_free (ctx);
+  audio_convert_clean_fmt (&ctx->in);
+  audio_convert_clean_fmt (&ctx->out);
+  gst_channel_mix_unset_matrix (ctx);
+
+  g_free (ctx->tmpbuf);
+  ctx->tmpbuf = NULL;
+  ctx->tmpbufsize = 0;
+
+  return TRUE;
+}
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+gboolean
+audio_convert_get_sizes (AudioConvertCtx * ctx, gint samples, gint * srcsize,
+    gint * dstsize)
+{
+  g_return_val_if_fail (ctx != NULL, FALSE);
+
+  if (srcsize)
+    *srcsize = samples * ctx->in.unit_size;
+  if (dstsize)
+    *dstsize = samples * ctx->out.unit_size;
+
+  return TRUE;
+}
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+gboolean
+audio_convert_convert (AudioConvertCtx * ctx, gpointer src,
+    gpointer dst, gint samples, gboolean src_writable)
+{
+  gint insize, outsize, size;
+  gpointer outbuf, tmpbuf;
+  gint intemp = 0, outtemp = 0, biggest;
+
+  g_return_val_if_fail (ctx != NULL, FALSE);
+  g_return_val_if_fail (src != NULL, FALSE);
+  g_return_val_if_fail (dst != NULL, FALSE);
+  g_return_val_if_fail (samples >= 0, FALSE);
+
+  if (samples == 0)
+    return TRUE;
+
+  insize = ctx->in.unit_size * samples;
+  outsize = ctx->out.unit_size * samples;
+
+  /* find biggest temp buffer size */
+  size = (DOUBLE_INTERMEDIATE_FORMAT (ctx)) ? sizeof (gdouble)
+      : sizeof (gint32);
+
+  if (!ctx->in_default)
+    intemp = insize * size * 8 / ctx->in.width;
+  if (!ctx->mix_passthrough || !ctx->out_default)
+    outtemp = outsize * size * 8 / ctx->out.width;
+  biggest = MAX (intemp, outtemp);
+
+  /* see if one of the buffers can be used as temp */
+  if ((outsize >= biggest) && (ctx->out.unit_size <= size))
+    tmpbuf = dst;
+  else if ((insize >= biggest) && src_writable && (ctx->in.unit_size >= size))
+    tmpbuf = src;
+  else {
+    if (biggest > ctx->tmpbufsize) {
+      ctx->tmpbuf = g_realloc (ctx->tmpbuf, biggest);
+      ctx->tmpbufsize = biggest;
+    }
+    tmpbuf = ctx->tmpbuf;
+  }
+
+  /* start conversion */
+  if (!ctx->in_default) {
+    /* check if final conversion */
+    if (!(ctx->out_default && ctx->mix_passthrough))
+      outbuf = tmpbuf;
+    else
+      outbuf = dst;
+
+    /* unpack to default format */
+    ctx->unpack (src, outbuf, ctx->in_scale, samples * ctx->in.channels);
+
+    src = outbuf;
+  }
+
+  if (!ctx->mix_passthrough) {
+    /* check if final conversion */
+    if (!ctx->out_default)
+      outbuf = tmpbuf;
+    else
+      outbuf = dst;
+
+    /* convert channels */
+    ctx->channel_mix (ctx, src, outbuf, samples);
+
+    src = outbuf;
+  }
+
+  /* we only need to quantize if output format is int */
+  if (ctx->out.is_int) {
+    if (ctx->out_default)
+      outbuf = dst;
+    else
+      outbuf = tmpbuf;
+    ctx->quantize (ctx, src, outbuf, samples);
+  }
+
+  if (!ctx->out_default) {
+    /* pack default format into dst */
+    ctx->pack (src, dst, ctx->out_scale, samples * ctx->out.channels);
+  }
+
+  return TRUE;
+}