| /* |
| ** Copyright (C) 2002-2011 Erik de Castro Lopo <erikd@mega-nerd.com> |
| ** |
| ** This program is free software; you can redistribute it and/or modify |
| ** it under the terms of the GNU General Public License as published by |
| ** the Free Software Foundation; either version 2 of the License, or |
| ** (at your option) any later version. |
| ** |
| ** This program is distributed in the hope that it will be useful, |
| ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| ** GNU General Public License for more details. |
| ** |
| ** You should have received a copy of the GNU General Public License |
| ** along with this program; if not, write to the Free Software |
| ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <math.h> |
| |
| #include <samplerate.h> |
| |
| #include "util.h" |
| |
| #define BUFFER_LEN 2048 |
| |
| static void simple_test (int converter, double ratio) ; |
| |
| int |
| main (void) |
| { static double src_ratios [] = |
| { 1.0001, 0.099, 0.1, 0.33333333, 0.789, 1.9, 3.1, 9.9 |
| } ; |
| |
| int k ; |
| |
| puts ("") ; |
| |
| puts (" Zero Order Hold interpolator :") ; |
| for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++) |
| simple_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ; |
| |
| puts (" Linear interpolator :") ; |
| for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++) |
| simple_test (SRC_LINEAR, src_ratios [k]) ; |
| |
| puts (" Sinc interpolator :") ; |
| for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++) |
| simple_test (SRC_SINC_FASTEST, src_ratios [k]) ; |
| |
| puts ("") ; |
| |
| return 0 ; |
| } /* main */ |
| |
| static void |
| simple_test (int converter, double src_ratio) |
| { static float input [BUFFER_LEN], output [BUFFER_LEN] ; |
| |
| SRC_DATA src_data ; |
| |
| int input_len, output_len, error, terminate ; |
| |
| printf ("\tsimple_test (SRC ratio = %6.4f) ........... ", src_ratio) ; |
| fflush (stdout) ; |
| |
| /* Calculate maximun input and output lengths. */ |
| if (src_ratio >= 1.0) |
| { output_len = BUFFER_LEN ; |
| input_len = (int) floor (BUFFER_LEN / src_ratio) ; |
| } |
| else |
| { input_len = BUFFER_LEN ; |
| output_len = (int) floor (BUFFER_LEN * src_ratio) ; |
| } ; |
| |
| /* Reduce input_len by 10 so output is longer than necessary. */ |
| input_len -= 10 ; |
| |
| if (output_len > BUFFER_LEN) |
| { printf ("\n\nLine %d : output_len > BUFFER_LEN\n\n", __LINE__) ; |
| exit (1) ; |
| } ; |
| |
| memset (&src_data, 0, sizeof (src_data)) ; |
| |
| src_data.data_in = input ; |
| src_data.input_frames = input_len ; |
| |
| src_data.src_ratio = src_ratio ; |
| |
| src_data.data_out = output ; |
| src_data.output_frames = BUFFER_LEN ; |
| |
| if ((error = src_simple (&src_data, converter, 1))) |
| { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; |
| exit (1) ; |
| } ; |
| |
| terminate = (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ; |
| |
| if (fabs (src_data.output_frames_gen - src_ratio * input_len) > 2 * terminate) |
| { printf ("\n\nLine %d : bad output data length %ld should be %d.\n", __LINE__, |
| src_data.output_frames_gen, (int) floor (src_ratio * input_len)) ; |
| printf ("\tsrc_ratio : %.4f\n", src_ratio) ; |
| printf ("\tinput_len : %d\n\toutput_len : %d\n\n", input_len, output_len) ; |
| exit (1) ; |
| } ; |
| |
| puts ("ok") ; |
| |
| return ; |
| } /* simple_test */ |
| |