 arch.h            
 fixed_arm4.h      
 fixed_arm5e.h     
 fixed_bfin.h      
 fixed_debug.h     
 fixed_generic.h   
 resample.c        
 speex_resampler.h 

are taken from http://git.xiph.org/speex.git/ as of 2008-10-28.

The only changes are:

--- arch.h	2008-11-28 09:57:15.000000000 +0100
+++ arch.h	2008-11-28 09:57:37.000000000 +0100
@@ -78,7 +78,10 @@
 #include "../include/speex/speex_types.h"
 #endif
 
+#ifndef ABS
 #define ABS(x) ((x) < 0 ? (-(x)) : (x))      /**< Absolute integer value. */
+#endif
+
 #define ABS16(x) ((x) < 0 ? (-(x)) : (x))    /**< Absolute 16-bit value.  */
 #define MIN16(a,b) ((a) < (b) ? (a) : (b))   /**< Maximum 16-bit value.   */
 #define MAX16(a,b) ((a) > (b) ? (a) : (b))   /**< Maximum 16-bit value.   */
@@ -134,6 +137,28 @@
 
 #else
 
+#ifdef DOUBLE_PRECISION
+typedef double spx_mem_t;
+typedef double spx_coef_t;
+typedef double spx_lsp_t;
+typedef double spx_sig_t;
+typedef double spx_word16_t;
+typedef double spx_word32_t;
+
+#define Q15ONE 1.0
+#define LPC_SCALING  1.
+#define SIG_SCALING  1.
+#define LSP_SCALING  1.
+#define GAMMA_SCALING 1.
+#define GAIN_SCALING 1.
+#define GAIN_SCALING_1 1.
+
+
+#define VERY_SMALL 1e-20
+#define VERY_LARGE32 1e20
+#define VERY_LARGE16 1e20
+#define Q15_ONE ((spx_word16_t)1.)
+#else /* !DOUBLE_PRECISION */
 typedef float spx_mem_t;
 typedef float spx_coef_t;
 typedef float spx_lsp_t;
@@ -154,6 +179,7 @@
 #define VERY_LARGE32 1e15f
 #define VERY_LARGE16 1e15f
 #define Q15_ONE ((spx_word16_t)1.f)
+#endif /* DOUBLE_PRECISION */
 
 #define QCONST16(x,bits) (x)
 #define QCONST32(x,bits) (x)
--- resample.c	2008-11-28 09:56:42.000000000 +0100
+++ resample.c	2008-11-01 20:38:35.000000000 +0100
@@ -63,22 +63,27 @@
 
 #ifdef OUTSIDE_SPEEX
 #include <stdlib.h>
-static void *
+
+#include <glib.h>
+
+#define EXPORT G_GNUC_INTERNAL
+
+static inline void *
 speex_alloc (int size)
 {
-  return calloc (size, 1);
+  return g_malloc0 (size);
 }
 
-static void *
+static inline void *
 speex_realloc (void *ptr, int size)
 {
-  return realloc (ptr, size);
+  return g_realloc (ptr, size);
 }
 
-static void
+static inline void
 speex_free (void *ptr)
 {
-  free (ptr);
+  g_free (ptr);
 }
 
 #include "speex_resampler.h"
@@ -90,7 +95,6 @@
 #include "os_support.h"
 #endif /* OUTSIDE_SPEEX */
 
-#include "stack_alloc.h"
 #include <math.h>
 
 #ifndef M_PI
@@ -263,10 +267,17 @@
 };
 
 /*8,24,40,56,80,104,128,160,200,256,320*/
+#ifdef DOUBLE_PRECISION
+static double
+compute_func (double x, struct FuncDef *func)
+{
+  double y, frac;
+#else
 static double
 compute_func (float x, struct FuncDef *func)
 {
   float y, frac;
+#endif
   double interp[4];
   int ind;
   y = x * func->oversample;
@@ -317,11 +328,19 @@
 }
 #else
 /* The slow way of computing a sinc for the table. Should improve that some day */
+#ifdef DOUBLE_PRECISION
+static spx_word16_t
+sinc (double cutoff, double x, int N, struct FuncDef *window_func)
+{
+  /*fprintf (stderr, "%f ", x); */
+  double xx = x * cutoff;
+#else
 static spx_word16_t
 sinc (float cutoff, float x, int N, struct FuncDef *window_func)
 {
   /*fprintf (stderr, "%f ", x); */
   float xx = x * cutoff;
+#endif
   if (fabs (x) < 1e-6)
     return cutoff;
   else if (fabs (x) > .5 * N)
@@ -372,6 +391,7 @@
 }
 #endif
 
+#ifndef DOUBLE_PRECISION
 static int
 resampler_basic_direct_single (SpeexResamplerState * st,
     spx_uint32_t channel_index, const spx_word16_t * in, spx_uint32_t * in_len,
@@ -421,6 +441,7 @@
   st->samp_frac_num[channel_index] = samp_frac_num;
   return out_sample;
 }
+#endif
 
 #ifdef FIXED_POINT
 #else
@@ -476,6 +497,7 @@
 }
 #endif
 
+#ifndef DOUBLE_PRECISION
 static int
 resampler_basic_interpolate_single (SpeexResamplerState * st,
     spx_uint32_t channel_index, const spx_word16_t * in, spx_uint32_t * in_len,
@@ -554,6 +576,7 @@
   st->samp_frac_num[channel_index] = samp_frac_num;
   return out_sample;
 }
+#endif
 
 #ifdef FIXED_POINT
 #else
@@ -584,10 +607,16 @@
         PDIV32 (SHL32 ((samp_frac_num * st->oversample) % st->den_rate, 15),
         st->den_rate);
 #else
+#ifdef DOUBLE_PRECISION
+    const spx_word16_t frac =
+        ((double) ((samp_frac_num * st->oversample) % st->den_rate)) /
+        st->den_rate;
+#else
     const spx_word16_t frac =
         ((float) ((samp_frac_num * st->oversample) % st->den_rate)) /
         st->den_rate;
 #endif
+#endif
     spx_word16_t interp[4];
 
 
@@ -688,20 +717,27 @@
       spx_int32_t j;
       for (j = 0; j < st->filt_len; j++) {
         st->sinc_table[i * st->filt_len + j] =
-            sinc (st->cutoff,
-            ((j - (spx_int32_t) st->filt_len / 2 + 1) -
+            sinc (st->cutoff, ((j - (spx_int32_t) st->filt_len / 2 + 1) -
+#ifdef DOUBLE_PRECISION
+                ((double) i) / st->den_rate), st->filt_len,
+#else
                 ((float) i) / st->den_rate), st->filt_len,
+#endif
             quality_map[st->quality].window_func);
       }
     }
 #ifdef FIXED_POINT
     st->resampler_ptr = resampler_basic_direct_single;
 #else
+#ifdef DOUBLE_PRECISION
+    st->resampler_ptr = resampler_basic_direct_double;
+#else
     if (st->quality > 8)
       st->resampler_ptr = resampler_basic_direct_double;
     else
       st->resampler_ptr = resampler_basic_direct_single;
 #endif
+#endif
     /*fprintf (stderr, "resampler uses direct sinc table and normalised cutoff %f\n", cutoff); */
   } else {
     spx_int32_t i;
@@ -717,16 +753,24 @@
     }
     for (i = -4; i < (spx_int32_t) (st->oversample * st->filt_len + 4); i++)
       st->sinc_table[i + 4] =
+#ifdef DOUBLE_PRECISION
+          sinc (st->cutoff, (i / (double) st->oversample - st->filt_len / 2),
+#else
           sinc (st->cutoff, (i / (float) st->oversample - st->filt_len / 2),
+#endif
           st->filt_len, quality_map[st->quality].window_func);
 #ifdef FIXED_POINT
     st->resampler_ptr = resampler_basic_interpolate_single;
 #else
+#ifdef DOUBLE_PRECISION
+    st->resampler_ptr = resampler_basic_interpolate_double;
+#else
     if (st->quality > 8)
       st->resampler_ptr = resampler_basic_interpolate_double;
     else
       st->resampler_ptr = resampler_basic_interpolate_single;
 #endif
+#endif
     /*fprintf (stderr, "resampler uses interpolated sinc table and normalised cutoff %f\n", cutoff); */
   }
   st->int_advance = st->num_rate / st->den_rate;
@@ -956,11 +1000,18 @@
     spx_uint32_t channel_index, const spx_int16_t * in, spx_uint32_t * in_len,
     spx_int16_t * out, spx_uint32_t * out_len)
 #else
+#ifdef DOUBLE_PRECISION
+EXPORT int
+speex_resampler_process_float (SpeexResamplerState * st,
+    spx_uint32_t channel_index, const double *in, spx_uint32_t * in_len,
+    double *out, spx_uint32_t * out_len)
+#else
 EXPORT int
 speex_resampler_process_float (SpeexResamplerState * st,
     spx_uint32_t channel_index, const float *in, spx_uint32_t * in_len,
     float *out, spx_uint32_t * out_len)
 #endif
+#endif
 {
   int j;
   spx_uint32_t ilen = *in_len;
@@ -1078,9 +1129,16 @@
   return RESAMPLER_ERR_SUCCESS;
 }
 
+#ifdef DOUBLE_PRECISION
+EXPORT int
+speex_resampler_process_interleaved_float (SpeexResamplerState * st,
+    const double *in, spx_uint32_t * in_len, double *out,
+    spx_uint32_t * out_len)
+#else
 EXPORT int
 speex_resampler_process_interleaved_float (SpeexResamplerState * st,
     const float *in, spx_uint32_t * in_len, float *out, spx_uint32_t * out_len)
+#endif
 {
   spx_uint32_t i;
   int istride_save, ostride_save;
--- speex_resampler.h	2008-11-28 09:57:15.000000000 +0100
+++ speex_resampler.h	2008-11-28 09:57:37.000000000 +0100
@@ -77,10 +77,10 @@
 #define speex_resampler_reset_mem CAT_PREFIX(RANDOM_PREFIX,_resampler_reset_mem)
 #define speex_resampler_strerror CAT_PREFIX(RANDOM_PREFIX,_resampler_strerror)
 
-#define spx_int16_t short
-#define spx_int32_t int
-#define spx_uint16_t unsigned short
-#define spx_uint32_t unsigned int
+#define spx_int16_t gint16
+#define spx_int32_t gint32
+#define spx_uint16_t guint16
+#define spx_uint32_t guint32
 
 #else /* OUTSIDE_SPEEX */
 
@@ -162,10 +162,17 @@
  * @param out Output buffer
  * @param out_len Size of the output buffer. Returns the number of samples written
  */
+#ifdef DOUBLE_PRECISION
+  int speex_resampler_process_float (SpeexResamplerState * st,
+      spx_uint32_t channel_index,
+      const double *in,
+      spx_uint32_t * in_len, double *out, spx_uint32_t * out_len);
+#else
   int speex_resampler_process_float (SpeexResamplerState * st,
       spx_uint32_t channel_index,
       const float *in,
       spx_uint32_t * in_len, float *out, spx_uint32_t * out_len);
+#endif
 
 /** Resample an int array. The input and output buffers must *not* overlap.
  * @param st Resampler state
@@ -191,9 +198,15 @@
  * @param out_len Size of the output buffer. Returns the number of samples written.
  * This is all per-channel.
  */
+#ifdef DOUBLE_PRECISION
+  int speex_resampler_process_interleaved_float (SpeexResamplerState * st,
+      const double *in,
+      spx_uint32_t * in_len, double *out, spx_uint32_t * out_len);
+#else
   int speex_resampler_process_interleaved_float (SpeexResamplerState * st,
       const float *in,
       spx_uint32_t * in_len, float *out, spx_uint32_t * out_len);
+#endif
 
 /** Resample an interleaved int array. The input and output buffers must *not* overlap.
  * @param st Resampler state
