opus - Jun 2019 - resample of libopusenc-0.2.1 outputs all zeros if define FIXED_POINT

Actually opus-tools-0.2 has the same issue.

Sincerely

Forrest Zhang

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Add "#define FIXED_POINT 1" into the top of resample.c, outputs of
resample are all zeros.

Actually the data transform is required before/after calling
speex_resampler_process_native().

diff -Naupr libopusenc-0.2.1-vanilla/src/resample.c
libopusenc-0.2.1/src/resample.c
--- libopusenc-0.2.1-vanilla/src/resample.c	2018-09-15 10:35:06 +0800
+++ libopusenc-0.2.1/src/resample.c	2019-06-15 01:32:37 +0800
@@ -82,7 +82,7 @@ static void speex_free(void *ptr) {free(
 #include <limits.h>
 
 #ifndef M_PI
-#define M_PI 3.14159265358979323846
+#define M_PI 3.14159265358979323846f
 #endif
 
 #define IMAX(a,b) ((a) > (b) ? (a) : (b))
@@ -1000,7 +1000,8 @@ EXPORT int speex_resampler_process_int(S
        if (in) {
          for(j=0;j<ichunk;++j)
 #ifdef FIXED_POINT
-           x[j+st->filt_len-1]=WORD2INT(in[j*istride_save]);
+           /* [-1.0, 1.0] ==> [-32768, 32767] */
+           x[j+st->filt_len-1]=WORD2INT(32768 * in[j*istride_save]);
 #else
            x[j+st->filt_len-1]=in[j*istride_save];
 #endif
@@ -1017,7 +1018,8 @@ EXPORT int speex_resampler_process_int(S
 
      for (j=0;j<ochunk+omagic;++j)
 #ifdef FIXED_POINT
-        out[j*ostride_save] = ystack[j];
+         /* [-32768, 32767] ==> [-1.0, 1.0] */
+        out[j*ostride_save] = ystack[j] / 32768.f;
 #else
         out[j*ostride_save] = WORD2INT(ystack[j]);
 #endif