| /* |
| ** Copyright (C) 2006-2011 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 <math.h> |
| #include <string.h> |
| |
| #include <samplerate.h> |
| |
| #include "util.h" |
| |
| #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) ; |
| |
| 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 */ |
| |