diff src/libsamplerate-0.1.9/tests/varispeed_test.c @ 126:4a7071416412

Current libsamplerate source

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libsamplerate-0.1.9/tests/varispeed_test.c	Tue Oct 18 13:24:45 2016 +0100
@@ -0,0 +1,151 @@
+/*
+** Copyright (c) 2006-2016, Erik de Castro Lopo <[e-mail]>
+** 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 */
+