Bundle libsamplerate

[audio-libsamplerate.git] / libsamplerate / tests / varispeed_test.c

diff --git a/libsamplerate/tests/varispeed_test.c b/libsamplerate/tests/varispeed_test.c
new file mode 100644 (file)
index 0000000..92ba260
--- /dev/null
+++ b/libsamplerate/tests/varispeed_test.c
@@ -0,0 +1,151 @@
+/*
+** Copyright (c) 2006-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
+** All rights reserved.
+**
+** This code is released under 2-clause BSD license. Please see the
+** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING
+*/
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+
+#include <samplerate.h>
+
+#include "util.h"
+
+#if HAVE_FFTW3
+#include <fftw3.h>
+#else
+#define fftw_cleanup()
+#endif
+
+#define        BUFFER_LEN              (1 << 16)
+
+static void varispeed_test (int converter, double target_snr) ;
+
+int
+main (void)
+{
+       puts ("") ;
+       printf ("    Zero Order Hold interpolator    : ") ;
+       varispeed_test (SRC_ZERO_ORDER_HOLD, 10.0) ;
+
+       printf ("    Linear interpolator             : ") ;
+       varispeed_test (SRC_LINEAR, 10.0) ;
+
+       printf ("    Sinc interpolator               : ") ;
+       varispeed_test (SRC_SINC_FASTEST, 115.0) ;
+
+       fftw_cleanup () ;
+       puts ("") ;
+
+       return 0 ;
+} /* main */
+
+static void
+varispeed_test (int converter, double target_snr)
+{      static float input [BUFFER_LEN], output [BUFFER_LEN] ;
+       double sine_freq, snr ;
+
+       SRC_STATE       *src_state ;
+       SRC_DATA        src_data ;
+
+       int input_len, error ;
+
+       memset (input, 0, sizeof (input)) ;
+
+       input_len = ARRAY_LEN (input) / 2 ;
+
+       sine_freq = 0.0111 ;
+       gen_windowed_sines (1, &sine_freq, 1.0, input, input_len) ;
+
+       /* Perform sample rate conversion. */
+       if ((src_state = src_new (converter, 1, &error)) == NULL)
+       {       printf ("\n\nLine %d : src_new() failed : %s\n\n", __LINE__, src_strerror (error)) ;
+               exit (1) ;
+               } ;
+
+       src_data.end_of_input = 1 ;
+
+       src_data.data_in = input ;
+       src_data.input_frames = input_len ;
+
+       src_data.src_ratio = 3.0 ;
+
+       src_data.data_out = output ;
+       src_data.output_frames = ARRAY_LEN (output) ;
+
+       if ((error = src_set_ratio (src_state, 1.0 / src_data.src_ratio)))
+       {       printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
+               exit (1) ;
+               } ;
+
+       if ((error = src_process (src_state, &src_data)))
+       {       printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
+               printf ("  src_data.input_frames  : %ld\n", src_data.input_frames) ;
+               printf ("  src_data.output_frames : %ld\n\n", src_data.output_frames) ;
+               exit (1) ;
+               } ;
+
+       if (src_data.input_frames_used != input_len)
+       {       printf ("\n\nLine %d : unused input.\n", __LINE__) ;
+               printf ("\tinput_len         : %d\n", input_len) ;
+               printf ("\tinput_frames_used : %ld\n\n", src_data.input_frames_used) ;
+               exit (1) ;
+               } ;
+
+       /* Copy the last output to the input. */
+       memcpy (input, output, sizeof (input)) ;
+       reverse_data (input, src_data.output_frames_gen) ;
+
+       if ((error = src_reset (src_state)))
+       {       printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
+               exit (1) ;
+               } ;
+
+       src_data.end_of_input = 1 ;
+
+       src_data.data_in = input ;
+       input_len = src_data.input_frames = src_data.output_frames_gen ;
+
+       src_data.data_out = output ;
+       src_data.output_frames = ARRAY_LEN (output) ;
+
+       if ((error = src_set_ratio (src_state, 1.0 / src_data.src_ratio)))
+       {       printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
+               exit (1) ;
+               } ;
+
+       if ((error = src_process (src_state, &src_data)))
+       {       printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
+               printf ("  src_data.input_frames  : %ld\n", src_data.input_frames) ;
+               printf ("  src_data.output_frames : %ld\n\n", src_data.output_frames) ;
+               exit (1) ;
+               } ;
+
+       if (src_data.input_frames_used != input_len)
+       {       printf ("\n\nLine %d : unused input.\n", __LINE__) ;
+               printf ("\tinput_len         : %d\n", input_len) ;
+               printf ("\tinput_frames_used : %ld\n\n", src_data.input_frames_used) ;
+               exit (1) ;
+               } ;
+
+       src_state = src_delete (src_state) ;
+
+       snr = calculate_snr (output, src_data.output_frames_gen, 1) ;
+
+       if (target_snr > snr)
+       {       printf ("\n\nLine %d : snr (%3.1f) does not meet target (%3.1f)\n\n", __LINE__, snr, target_snr) ;
+               save_oct_float ("varispeed.mat", input, src_data.input_frames, output, src_data.output_frames_gen) ;
+               exit (1) ;
+               } ;
+
+       puts ("ok") ;
+
+       return ;
+} /* varispeed_test */
+