cannam@85: /*
cannam@85: ** Copyright (C) 2006-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
cannam@85: **
cannam@85: ** This program is free software; you can redistribute it and/or modify
cannam@85: ** it under the terms of the GNU General Public License as published by
cannam@85: ** the Free Software Foundation; either version 2 of the License, or
cannam@85: ** (at your option) any later version.
cannam@85: **
cannam@85: ** This program is distributed in the hope that it will be useful,
cannam@85: ** but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@85: ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
cannam@85: ** GNU General Public License for more details.
cannam@85: **
cannam@85: ** You should have received a copy of the GNU General Public License
cannam@85: ** along with this program; if not, write to the Free Software
cannam@85: ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
cannam@85: */
cannam@85: 
cannam@85: #include <stdio.h>
cannam@85: #include <stdlib.h>
cannam@85: #include <math.h>
cannam@85: #include <string.h>
cannam@85: 
cannam@85: #include <samplerate.h>
cannam@85: 
cannam@85: #include "util.h"
cannam@85: 
cannam@85: #define	BUFFER_LEN		(1 << 16)
cannam@85: 
cannam@85: static void varispeed_test (int converter, double target_snr) ;
cannam@85: 
cannam@85: int
cannam@85: main (void)
cannam@85: {
cannam@85: 	puts ("") ;
cannam@85: 	printf ("    Zero Order Hold interpolator    : ") ;
cannam@85: 	varispeed_test (SRC_ZERO_ORDER_HOLD, 10.0) ;
cannam@85: 
cannam@85: 	printf ("    Linear interpolator             : ") ;
cannam@85: 	varispeed_test (SRC_LINEAR, 10.0) ;
cannam@85: 
cannam@85: 	printf ("    Sinc interpolator               : ") ;
cannam@85: 	varispeed_test (SRC_SINC_FASTEST, 115.0) ;
cannam@85: 
cannam@85: 	puts ("") ;
cannam@85: 
cannam@85: 	return 0 ;
cannam@85: } /* main */
cannam@85: 
cannam@85: static void
cannam@85: varispeed_test (int converter, double target_snr)
cannam@85: {	static float input [BUFFER_LEN], output [BUFFER_LEN] ;
cannam@85: 	double sine_freq, snr ;
cannam@85: 
cannam@85: 	SRC_STATE	*src_state ;
cannam@85: 	SRC_DATA	src_data ;
cannam@85: 
cannam@85: 	int input_len, error ;
cannam@85: 
cannam@85: 	memset (input, 0, sizeof (input)) ;
cannam@85: 
cannam@85: 	input_len = ARRAY_LEN (input) / 2 ;
cannam@85: 
cannam@85: 	sine_freq = 0.0111 ;
cannam@85: 	gen_windowed_sines (1, &sine_freq, 1.0, input, input_len) ;
cannam@85: 
cannam@85: 	/* Perform sample rate conversion. */
cannam@85: 	if ((src_state = src_new (converter, 1, &error)) == NULL)
cannam@85: 	{	printf ("\n\nLine %d : src_new() failed : %s\n\n", __LINE__, src_strerror (error)) ;
cannam@85: 		exit (1) ;
cannam@85: 		} ;
cannam@85: 
cannam@85: 	src_data.end_of_input = 1 ;
cannam@85: 
cannam@85: 	src_data.data_in = input ;
cannam@85: 	src_data.input_frames = input_len ;
cannam@85: 
cannam@85: 	src_data.src_ratio = 3.0 ;
cannam@85: 
cannam@85: 	src_data.data_out = output ;
cannam@85: 	src_data.output_frames = ARRAY_LEN (output) ;
cannam@85: 
cannam@85: 	if ((error = src_set_ratio (src_state, 1.0 / src_data.src_ratio)))
cannam@85: 	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
cannam@85: 		exit (1) ;
cannam@85: 		} ;
cannam@85: 
cannam@85: 	if ((error = src_process (src_state, &src_data)))
cannam@85: 	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
cannam@85: 		printf ("  src_data.input_frames  : %ld\n", src_data.input_frames) ;
cannam@85: 		printf ("  src_data.output_frames : %ld\n\n", src_data.output_frames) ;
cannam@85: 		exit (1) ;
cannam@85: 		} ;
cannam@85: 
cannam@85: 	if (src_data.input_frames_used != input_len)
cannam@85: 	{	printf ("\n\nLine %d : unused input.\n", __LINE__) ;
cannam@85: 		printf ("\tinput_len         : %d\n", input_len) ;
cannam@85: 		printf ("\tinput_frames_used : %ld\n\n", src_data.input_frames_used) ;
cannam@85: 		exit (1) ;
cannam@85: 		} ;
cannam@85: 
cannam@85: 	/* Copy the last output to the input. */
cannam@85: 	memcpy (input, output, sizeof (input)) ;
cannam@85: 	reverse_data (input, src_data.output_frames_gen) ;
cannam@85: 
cannam@85: 	if ((error = src_reset (src_state)))
cannam@85: 	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
cannam@85: 		exit (1) ;
cannam@85: 		} ;
cannam@85: 
cannam@85: 	src_data.end_of_input = 1 ;
cannam@85: 
cannam@85: 	src_data.data_in = input ;
cannam@85: 	input_len = src_data.input_frames = src_data.output_frames_gen ;
cannam@85: 
cannam@85: 	src_data.data_out = output ;
cannam@85: 	src_data.output_frames = ARRAY_LEN (output) ;
cannam@85: 
cannam@85: 	if ((error = src_set_ratio (src_state, 1.0 / src_data.src_ratio)))
cannam@85: 	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
cannam@85: 		exit (1) ;
cannam@85: 		} ;
cannam@85: 
cannam@85: 	if ((error = src_process (src_state, &src_data)))
cannam@85: 	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
cannam@85: 		printf ("  src_data.input_frames  : %ld\n", src_data.input_frames) ;
cannam@85: 		printf ("  src_data.output_frames : %ld\n\n", src_data.output_frames) ;
cannam@85: 		exit (1) ;
cannam@85: 		} ;
cannam@85: 
cannam@85: 	if (src_data.input_frames_used != input_len)
cannam@85: 	{	printf ("\n\nLine %d : unused input.\n", __LINE__) ;
cannam@85: 		printf ("\tinput_len         : %d\n", input_len) ;
cannam@85: 		printf ("\tinput_frames_used : %ld\n\n", src_data.input_frames_used) ;
cannam@85: 		exit (1) ;
cannam@85: 		} ;
cannam@85: 
cannam@85: 	src_state = src_delete (src_state) ;
cannam@85: 
cannam@85: 	snr = calculate_snr (output, src_data.output_frames_gen, 1) ;
cannam@85: 
cannam@85: 	if (target_snr > snr)
cannam@85: 	{	printf ("\n\nLine %d : snr (%3.1f) does not meet target (%3.1f)\n\n", __LINE__, snr, target_snr) ;
cannam@85: 		save_oct_float ("varispeed.mat", input, src_data.input_frames, output, src_data.output_frames_gen) ;
cannam@85: 		exit (1) ;
cannam@85: 		} ;
cannam@85: 
cannam@85: 	puts ("ok") ;
cannam@85: 
cannam@85: 	return ;
cannam@85: } /* varispeed_test */
cannam@85: