From aa2c396b174fb4bc11af10b9a50ae4c045eeb00d Mon Sep 17 00:00:00 2001
From: "Jeffrey C. Ollie" <jeff@ocjtech.us>
Date: Thu, 11 Sep 2008 00:51:00 -0500
Subject: Initial import of libresample 0.1.3

---
 tests/compareresample.c  | 183 ++++++++++++++++++++++++++++++++++++++++
 tests/resample-sndfile.c | 213 +++++++++++++++++++++++++++++++++++++++++++++++
 tests/testresample.c     | 182 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 578 insertions(+)
 create mode 100644 tests/compareresample.c
 create mode 100644 tests/resample-sndfile.c
 create mode 100644 tests/testresample.c

(limited to 'tests')

diff --git a/tests/compareresample.c b/tests/compareresample.c
new file mode 100644
index 0000000..8773c9d
--- /dev/null
+++ b/tests/compareresample.c
@@ -0,0 +1,183 @@
+/**********************************************************************
+
+  compareresample.c
+
+  Real-time library interface by Dominic Mazzoni
+
+  Based on resample-1.7:
+    http://www-ccrma.stanford.edu/~jos/resample/
+
+  License: LGPL - see the file LICENSE.txt for more information
+
+**********************************************************************/
+
+#include "../include/libresample.h"
+
+#include <samplerate.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include <sys/time.h>
+
+#define MIN(A, B) (A) < (B)? (A) : (B)
+
+void dostat(char *name, float *d1, float *d2, int len)
+{
+   int i;
+   double sum, sumsq, err, rmserr;
+
+   sum = 0.0;
+   sumsq = 0.0;
+   for(i=0; i<len; i++) {
+      double diff = d1[i] - d2[i];
+      sum += fabs(diff);
+      sumsq += diff * diff;
+   }
+   err = sum / len;
+   rmserr = sqrt(sumsq / len);
+   printf("   %s: Avg err: %f RMS err: %f\n", name, err, rmserr);
+}
+
+void runtest(float *src, int srclen,
+             float *ans, int anslen,
+             double factor)
+{
+   struct timeval tv0, tv1;
+   int dstlen = (int)(srclen * factor);
+   float *dst_rs = (float *)malloc((dstlen+100) * sizeof(float));
+   float *dst_rabbit = (float *)malloc((dstlen+100) * sizeof(float));
+   void *handle;
+   SRC_DATA rabbit;
+   double deltat;
+   int srcblocksize = srclen;
+   int dstblocksize = dstlen;
+   int i, out, out_rabbit, o, srcused;
+   int statlen, srcpos;
+
+   /* do resample */
+
+   for(i=0; i<dstlen+100; i++)
+      dst_rs[i] = -99.0;
+
+   gettimeofday(&tv0, NULL);
+
+   handle = resample_open(1, factor, factor);
+   out = 0;
+   srcpos = 0;
+   for(;;) {
+      int srcBlock = MIN(srclen-srcpos, srcblocksize);
+      int lastFlag = (srcBlock == srclen-srcpos);
+
+      o = resample_process(handle, factor,
+                           &src[srcpos], srcBlock,
+                           lastFlag, &srcused,
+                           &dst_rs[out], MIN(dstlen-out, dstblocksize));
+      srcpos += srcused;
+      if (o >= 0)
+         out += o;
+      if (o < 0 || (o == 0 && srcpos == srclen))
+         break;
+   }
+   resample_close(handle);
+
+   gettimeofday(&tv1, NULL);
+   deltat =
+      (tv1.tv_sec + tv1.tv_usec * 0.000001) -
+      (tv0.tv_sec + tv0.tv_usec * 0.000001);
+
+   if (o < 0) {
+      printf("Error: resample_process returned an error: %d\n", o);
+   }
+
+   if (out <= 0) {
+      printf("Error: resample_process returned %d samples\n", out);
+      free(dst_rs);
+      return;
+   }
+
+   printf("   resample: %.3f seconds, %d outputs\n", deltat, out);
+
+   /* do rabbit (Erik's libsamplerate) */
+
+   for(i=0; i<dstlen+100; i++)
+      dst_rabbit[i] = -99.0;
+
+   rabbit.data_in = src;
+   rabbit.data_out = dst_rabbit;
+   rabbit.input_frames = srclen;
+   rabbit.output_frames = dstlen;
+   rabbit.input_frames_used = 0;
+   rabbit.output_frames_gen = 0;
+   rabbit.end_of_input = 1;
+   rabbit.src_ratio = factor;
+
+   gettimeofday(&tv0, NULL);
+
+   /* src_simple(&rabbit, SRC_SINC_BEST_QUALITY, 1); */
+   src_simple(&rabbit, SRC_SINC_FASTEST, 1);
+   /* src_simple(&rabbit, SRC_LINEAR, 1); */
+
+   gettimeofday(&tv1, NULL);
+   deltat =
+      (tv1.tv_sec + tv1.tv_usec * 0.000001) -
+      (tv0.tv_sec + tv0.tv_usec * 0.000001);
+
+   out_rabbit = rabbit.output_frames_gen;
+
+   printf("   rabbit  : %.3f seconds, %d outputs\n",
+          deltat, out_rabbit);
+
+   statlen = MIN(out, out_rabbit);
+   if (anslen > 0)
+      statlen = MIN(statlen, anslen);
+
+   if (ans) {
+      dostat("resample    ", dst_rs, ans, statlen);
+      dostat("rabbit      ", dst_rabbit, ans, statlen);
+   }
+   dostat(   "RS vs rabbit", dst_rs, dst_rabbit, statlen);
+
+   free(dst_rs);
+   free(dst_rabbit);
+}
+
+int main(int argc, char **argv)
+{
+   int i, srclen;
+   float *src, *ans;
+
+   printf("\n*** sin wave, factor = 1.0 *** \n\n");
+   srclen = 100000;
+   src = malloc(srclen * sizeof(float));
+   for(i=0; i<srclen; i++)
+      src[i] = sin(i/100.0);
+
+   runtest(src, srclen, src, srclen, 1.0);
+
+   printf("\n*** sin wave, factor = 0.25 *** \n\n");
+   srclen = 100000;
+   for(i=0; i<srclen; i++)
+      src[i] = sin(i/100.0);
+   ans = malloc((srclen/4) * sizeof(float));
+   for(i=0; i<srclen/4; i++)
+      ans[i] = sin(i/25.0);
+
+   runtest(src, srclen, ans, srclen/4, 0.25);
+   free(ans);
+
+   printf("\n*** sin wave, factor = 4.0 *** \n\n");
+   srclen = 20000;
+   for(i=0; i<srclen; i++)
+      src[i] = sin(i/100.0);
+   ans = malloc((srclen*4) * sizeof(float));
+   for(i=0; i<srclen*4; i++)
+      ans[i] = sin(i/400.0);
+
+   runtest(src, srclen, ans, srclen*4, 4.0);
+   free(ans);
+   free(src);
+
+   return 0;
+}
diff --git a/tests/resample-sndfile.c b/tests/resample-sndfile.c
new file mode 100644
index 0000000..e780228
--- /dev/null
+++ b/tests/resample-sndfile.c
@@ -0,0 +1,213 @@
+/**********************************************************************
+
+  resample-sndfile.c
+
+  Written by Dominic Mazzoni
+
+  Based on resample-1.7:
+    http://www-ccrma.stanford.edu/~jos/resample/
+
+  License: LGPL - see the file LICENSE.txt for more information
+
+**********************************************************************/
+
+#include "../include/libresample.h"
+
+#include <sndfile.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include <sys/time.h>
+
+#define MIN(A, B) (A) < (B)? (A) : (B)
+
+void usage(char *progname)
+{
+   fprintf(stderr, "Usage: %s -by <ratio> <input> <output>\n", progname);
+   fprintf(stderr, "       %s -to <rate> <input> <output>\n", progname);
+   fprintf(stderr, "\n");
+   exit(-1);
+}
+
+int main(int argc, char **argv)
+{
+   SNDFILE *srcfile, *dstfile;
+   SF_INFO srcinfo, dstinfo;
+   SF_FORMAT_INFO formatinfo;
+   char *extension;
+   void **handle;
+   int channels;
+   int srclen, dstlen;
+   float *src, *srci;
+   float *dst, *dsti;
+   double ratio = 0.0;
+   double srcrate;
+   double dstrate = 0.0;
+   struct timeval tv0, tv1;
+   double deltat;
+   int numformats;
+   int pos, bufferpos, outcount;
+   int i, c;
+
+   if (argc != 5)
+      usage(argv[0]);
+
+   if (!strcmp(argv[1], "-by")) {
+      ratio = atof(argv[2]);
+      if (ratio <= 0.0) {
+         fprintf(stderr, "Ratio of %f is illegal\n", ratio);
+         usage(argv[0]);
+      }
+   }
+   else if (!strcmp(argv[1], "-to")) {
+      dstrate = atof(argv[2]);
+      if (dstrate < 10.0 || dstrate > 100000.0) {
+         fprintf(stderr, "Sample rate of %f is illegal\n", dstrate);
+         usage(argv[0]);
+      }
+   }
+   else
+      usage(argv[0]);
+
+   memset(&srcinfo, 0, sizeof(srcinfo));
+   memset(&dstinfo, 0, sizeof(dstinfo));
+   srcfile = sf_open(argv[3], SFM_READ, &srcinfo);
+   if (!srcfile) {
+      fprintf(stderr, "%s", sf_strerror(NULL));
+      exit(-1);
+   }
+
+   srcrate = srcinfo.samplerate;
+   if (dstrate == 0.0)
+      dstrate = srcrate * ratio;
+   else
+      ratio = dstrate / srcrate;
+
+   channels = srcinfo.channels;
+
+   /* figure out format of destination file */
+
+   extension = strstr(argv[4], ".");
+   if (extension) {
+      extension++;
+      sf_command(NULL, SFC_GET_FORMAT_MAJOR_COUNT,
+                 &numformats, sizeof(numformats));
+      for(i=0; i<numformats; i++) {
+         memset(&formatinfo, 0, sizeof(formatinfo));
+         formatinfo.format = i;
+         sf_command(NULL, SFC_GET_FORMAT_MAJOR,
+                    &formatinfo, sizeof(formatinfo));
+         if (!strcmp(formatinfo.extension, extension)) {
+            printf("Using %s for output format.\n", formatinfo.name);
+            dstinfo.format = formatinfo.format |
+               (srcinfo.format & SF_FORMAT_SUBMASK);
+            break;
+         }            
+      }
+   }
+
+   if (!dstinfo.format) {
+      if (extension)
+         printf("Warning: output format (%s) not recognized, "
+                "using same as input format.\n",
+                extension);
+      dstinfo.format = srcinfo.format;
+   }
+
+   dstinfo.samplerate = (int)(dstrate + 0.5);
+   dstinfo.channels = channels;
+
+   dstfile = sf_open(argv[4], SFM_WRITE, &dstinfo);
+   if (!dstfile) {
+      fprintf(stderr, "%s", sf_strerror(NULL));
+      exit(-1);
+   }
+
+   printf("Source: %s (%d frames, %.2f Hz)\n",
+          argv[3], (int)srcinfo.frames, srcrate);
+   printf("Destination: %s (%.2f Hz, ratio=%.5f)\n", argv[4],
+          dstrate, ratio);
+
+   srclen = 4096;
+   dstlen = (srclen * ratio + 1000);
+   srci = (float *)malloc(srclen * channels * sizeof(float));
+   dsti = (float *)malloc(dstlen * channels * sizeof(float));
+   src = (float *)malloc(srclen * sizeof(float));
+   dst = (float *)malloc(dstlen * sizeof(float));
+
+   handle = (void **)malloc(channels * sizeof(void *));
+   for(c=0; c<channels; c++)
+      handle[c] = resample_open(1, ratio, ratio);
+
+   gettimeofday(&tv0, NULL);
+
+   pos = 0;
+   bufferpos = 0;
+   outcount = 0;
+   while(pos < srcinfo.frames) {
+      int block = MIN(srclen-bufferpos, srcinfo.frames-pos);
+      int lastFlag = (pos+block == srcinfo.frames);
+      int inUsed, inUsed2=0, out=0, out2=0;
+
+      sf_readf_float(srcfile, &srci[bufferpos*channels], block);
+      block += bufferpos;
+
+      for(c=0; c<channels; c++) {
+         for(i=0; i<block; i++)
+            src[i] = srci[i*channels+c];
+
+         inUsed = 0;
+         out = resample_process(handle[c], ratio, src, block, lastFlag,
+                                &inUsed, dst, dstlen);
+         if (c==0) {
+            inUsed2 = inUsed;
+            out2 = out;
+         }
+         else {
+            if (inUsed2 != inUsed || out2 != out) {
+               fprintf(stderr, "Fatal error: channels out of sync!\n");
+               exit(-1);
+            }
+         }
+
+         for(i=0; i<out; i++)
+	 {
+	    if(dst[i] <= -1)
+	       dsti[i*channels+c] = -1;
+	    else if(dst[i] >= 1)
+	       dsti[i*channels+c] = 1;
+	    else
+	       dsti[i*channels+c] = dst[i];
+	 }
+      }
+
+      sf_writef_float(dstfile, dsti, out);
+
+      bufferpos = block - inUsed;
+      for(i=0; i<bufferpos*channels; i++)
+         srci[i] = srci[i+(inUsed*channels)];
+      pos += inUsed;
+      outcount += out;
+   }
+
+   sf_close(srcfile);
+   sf_close(dstfile);
+
+   gettimeofday(&tv1, NULL);
+   deltat =
+      (tv1.tv_sec + tv1.tv_usec * 0.000001) -
+      (tv0.tv_sec + tv0.tv_usec * 0.000001);
+
+   printf("Elapsed time: %.3f seconds\n", deltat);
+   printf("%d frames written to output file\n", outcount);
+
+   free(src);
+   free(srci);
+   free(dst);
+   free(dsti);
+
+   exit(0);
+}
diff --git a/tests/testresample.c b/tests/testresample.c
new file mode 100644
index 0000000..a59aa8b
--- /dev/null
+++ b/tests/testresample.c
@@ -0,0 +1,182 @@
+/**********************************************************************
+
+  testresample.c
+
+  Real-time library interface by Dominic Mazzoni
+
+  Based on resample-1.7:
+    http://www-ccrma.stanford.edu/~jos/resample/
+
+  License: LGPL - see the file LICENSE.txt for more information
+
+**********************************************************************/
+
+#include "../include/libresample.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#define MIN(A, B) (A) < (B)? (A) : (B)
+
+void runtest(int srclen, double freq, double factor,
+             int srcblocksize, int dstblocksize)
+{
+   int expectedlen = (int)(srclen * factor);
+   int dstlen = expectedlen + 1000;
+   float *src = (float *)malloc((srclen+100) * sizeof(float));
+   float *dst = (float *)malloc((dstlen+100) * sizeof(float));
+   void *handle;
+   double sum, sumsq, err, rmserr;
+   int i, out, o, srcused, errcount, rangecount;
+   int statlen, srcpos, lendiff;
+   int fwidth;
+
+   printf("-- srclen: %d sin freq: %.1f factor: %.3f srcblk: %d dstblk: %d\n",
+          srclen, freq, factor, srcblocksize, dstblocksize);
+
+   for(i=0; i<srclen; i++)
+      src[i] = sin(i/freq);
+   for(i=srclen; i<srclen+100; i++)
+      src[i] = -99.0;
+
+   for(i=0; i<dstlen+100; i++)
+      dst[i] = -99.0;
+
+   handle = resample_open(1, factor, factor);
+   fwidth = resample_get_filter_width(handle);
+   out = 0;
+   srcpos = 0;
+   for(;;) {
+      int srcBlock = MIN(srclen-srcpos, srcblocksize);
+      int lastFlag = (srcBlock == srclen-srcpos);
+
+      o = resample_process(handle, factor,
+                           &src[srcpos], srcBlock,
+                           lastFlag, &srcused,
+                           &dst[out], MIN(dstlen-out, dstblocksize));
+      srcpos += srcused;
+      if (o >= 0)
+         out += o;
+      if (o < 0 || (o == 0 && srcpos == srclen))
+         break;
+   }
+   resample_close(handle);
+
+   if (o < 0) {
+      printf("Error: resample_process returned an error: %d\n", o);
+   }
+
+   if (out <= 0) {
+      printf("Error: resample_process returned %d samples\n", out);
+      free(src);
+      free(dst);
+      return;
+   }
+
+   lendiff = abs(out - expectedlen);
+   if (lendiff > (int)(2*factor + 1.0)) {
+      printf("   Expected ~%d, got %d samples out\n",
+             expectedlen, out);
+   }
+   
+   sum = 0.0;
+   sumsq = 0.0;
+   errcount = 0.0;
+
+   /* Don't compute statistics on all output values; the last few
+      are guaranteed to be off because it's based on far less
+      interpolation. */
+   statlen = out - fwidth;
+
+   for(i=0; i<statlen; i++) {
+      double diff = sin((i/freq)/factor) - dst[i];
+      if (fabs(diff) > 0.05) {
+         if (errcount == 0)
+            printf("   First error at i=%d: expected %.3f, got %.3f\n",
+                   i, sin((i/freq)/factor), dst[i]);
+         errcount++;
+      }
+      sum += fabs(diff);
+      sumsq += diff * diff;
+   }
+
+   rangecount = 0;
+   for(i=0; i<statlen; i++) {
+      if (dst[i] < -1.01 || dst[i] > 1.01) {
+         if (rangecount == 0)
+            printf("   Error at i=%d: value is %.3f\n", i, dst[i]);
+         rangecount++;
+      }
+   }
+   if (rangecount > 1)
+      printf("   At least %d samples were out of range\n", rangecount);
+
+   if (errcount > 0) {
+      i = out - 1;
+      printf("   i=%d:  expected %.3f, got %.3f\n",
+             i, sin((i/freq)/factor), dst[i]);
+      printf("   At least %d samples had significant error.\n", errcount);
+   }
+   err = sum / statlen;
+   rmserr = sqrt(sumsq / statlen);
+   printf("   Out: %d samples  Avg err: %f RMS err: %f\n", out, err, rmserr);
+   free(src);
+   free(dst);
+}
+
+int main(int argc, char **argv)
+{
+   int i, srclen, dstlen, ifreq;
+   double factor;
+
+   printf("\n*** Vary source block size*** \n\n");
+   srclen = 10000;
+   ifreq = 100;
+   for(i=0; i<20; i++) {
+      factor = ((rand() % 16) + 1) / 4.0;
+      dstlen = (int)(srclen * factor + 10);
+      runtest(srclen, (double)ifreq, factor, 64, dstlen);
+      runtest(srclen, (double)ifreq, factor, 32, dstlen);
+      runtest(srclen, (double)ifreq, factor, 8, dstlen);
+      runtest(srclen, (double)ifreq, factor, 2, dstlen);
+      runtest(srclen, (double)ifreq, factor, srclen, dstlen);
+   }
+
+   printf("\n*** Vary dest block size ***\n\n");
+   srclen = 10000;
+   ifreq = 100;
+   for(i=0; i<20; i++) {
+      factor = ((rand() % 16) + 1) / 4.0;
+      runtest(srclen, (double)ifreq, factor, srclen, 32);
+      dstlen = (int)(srclen * factor + 10);
+      runtest(srclen, (double)ifreq, factor, srclen, dstlen);
+   }
+
+   printf("\n*** Resample factor 1.0, testing different srclen ***\n\n");
+   ifreq = 40;
+   for(i=0; i<100; i++) {
+      srclen = (rand() % 30000) + 10;
+      dstlen = (int)(srclen + 10);
+      runtest(srclen, (double)ifreq, 1.0, srclen, dstlen);
+   }
+
+   printf("\n*** Resample factor 1.0, testing different sin freq ***\n\n");
+   srclen = 10000;
+   for(i=0; i<100; i++) {
+      ifreq = ((int)rand() % 10000) + 1;
+      dstlen = (int)(srclen * 10);
+      runtest(srclen, (double)ifreq, 1.0, srclen, dstlen);
+   }
+
+   printf("\n*** Resample with different factors ***\n\n");
+   srclen = 10000;
+   ifreq = 100;
+   for(i=0; i<100; i++) {
+      factor = ((rand() % 64) + 1) / 4.0;
+      dstlen = (int)(srclen * factor + 10);
+      runtest(srclen, (double)ifreq, factor, srclen, dstlen);
+   }
+
+   return 0;
+}
-- 
cgit