| /* |
| ** 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 "config.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <math.h> |
| #include <time.h> |
| |
| #if (HAVE_FFTW3) |
| |
| #include <samplerate.h> |
| |
| #include "util.h" |
| |
| #define BUFFER_LEN 50000 |
| #define MAX_FREQS 4 |
| #define MAX_RATIOS 6 |
| #define MAX_SPEC_LEN (1<<15) |
| |
| #ifndef M_PI |
| #define M_PI 3.14159265358979323846264338 |
| #endif |
| |
| enum |
| { BOOLEAN_FALSE = 0, |
| BOOLEAN_TRUE = 1 |
| } ; |
| |
| typedef struct |
| { int freq_count ; |
| double freqs [MAX_FREQS] ; |
| |
| double src_ratio ; |
| int pass_band_peaks ; |
| |
| double snr ; |
| double peak_value ; |
| } SINGLE_TEST ; |
| |
| typedef struct |
| { int converter ; |
| int tests ; |
| int do_bandwidth_test ; |
| SINGLE_TEST test_data [10] ; |
| } CONVERTER_TEST ; |
| |
| static double snr_test (SINGLE_TEST *snr_test_data, int number, int converter, int verbose) ; |
| static double find_peak (float *output, int output_len) ; |
| static double bandwidth_test (int converter, int verbose) ; |
| |
| int |
| main (int argc, char *argv []) |
| { CONVERTER_TEST snr_test_data [] = |
| { |
| { SRC_ZERO_ORDER_HOLD, |
| 8, |
| BOOLEAN_FALSE, |
| { { 1, { 0.01111111111 }, 3.0, 1, 28.0, 1.0 }, |
| { 1, { 0.01111111111 }, 0.6, 1, 36.0, 1.0 }, |
| { 1, { 0.01111111111 }, 0.3, 1, 36.0, 1.0 }, |
| { 1, { 0.01111111111 }, 1.0, 1, 150.0, 1.0 }, |
| { 1, { 0.01111111111 }, 1.001, 1, 38.0, 1.0 }, |
| { 2, { 0.011111, 0.324 }, 1.9999, 2, 14.0, 1.0 }, |
| { 2, { 0.012345, 0.457 }, 0.456789, 1, 12.0, 1.0 }, |
| { 1, { 0.3511111111 }, 1.33, 1, 10.0, 1.0 } |
| } |
| }, |
| |
| { SRC_LINEAR, |
| 8, |
| BOOLEAN_FALSE, |
| { { 1, { 0.01111111111 }, 3.0, 1, 73.0, 1.0 }, |
| { 1, { 0.01111111111 }, 0.6, 1, 73.0, 1.0 }, |
| { 1, { 0.01111111111 }, 0.3, 1, 73.0, 1.0 }, |
| { 1, { 0.01111111111 }, 1.0, 1, 150.0, 1.0 }, |
| { 1, { 0.01111111111 }, 1.001, 1, 77.0, 1.0 }, |
| { 2, { 0.011111, 0.324 }, 1.9999, 2, 16.0, 0.94 }, |
| { 2, { 0.012345, 0.457 }, 0.456789, 1, 26.0, 0.96 }, |
| { 1, { 0.3511111111 }, 1.33, 1, 22.0, 0.99 } |
| } |
| }, |
| |
| { SRC_SINC_FASTEST, |
| 9, |
| BOOLEAN_TRUE, |
| { { 1, { 0.01111111111 }, 3.0, 1, 100.0, 1.0 }, |
| { 1, { 0.01111111111 }, 0.6, 1, 99.0, 1.0 }, |
| { 1, { 0.01111111111 }, 0.3, 1, 100.0, 1.0 }, |
| { 1, { 0.01111111111 }, 1.0, 1, 150.0, 1.0 }, |
| { 1, { 0.01111111111 }, 1.001, 1, 100.0, 1.0 }, |
| { 2, { 0.011111, 0.324 }, 1.9999, 2, 97.0, 1.0 }, |
| { 2, { 0.012345, 0.457 }, 0.456789, 1, 100.0, 0.5 }, |
| { 2, { 0.011111, 0.45 }, 0.6, 1, 97.0, 0.5 }, |
| { 1, { 0.3511111111 }, 1.33, 1, 97.0, 1.0 } |
| } |
| }, |
| |
| { SRC_SINC_MEDIUM_QUALITY, |
| 9, |
| BOOLEAN_TRUE, |
| { { 1, { 0.01111111111 }, 3.0, 1, 145.0, 1.0 }, |
| { 1, { 0.01111111111 }, 0.6, 1, 132.0, 1.0 }, |
| { 1, { 0.01111111111 }, 0.3, 1, 138.0, 1.0 }, |
| { 1, { 0.01111111111 }, 1.0, 1, 157.0, 1.0 }, |
| { 1, { 0.01111111111 }, 1.001, 1, 148.0, 1.0 }, |
| { 2, { 0.011111, 0.324 }, 1.9999, 2, 127.0, 1.0 }, |
| { 2, { 0.012345, 0.457 }, 0.456789, 1, 124.0, 0.5 }, |
| { 2, { 0.011111, 0.45 }, 0.6, 1, 126.0, 0.5 }, |
| { 1, { 0.43111111111 }, 1.33, 1, 121.0, 1.0 } |
| } |
| }, |
| |
| { SRC_SINC_BEST_QUALITY, |
| 9, |
| BOOLEAN_TRUE, |
| { { 1, { 0.01111111111 }, 3.0, 1, 149.0, 1.0 }, |
| { 1, { 0.01111111111 }, 0.6, 1, 147.0, 1.0 }, |
| { 1, { 0.01111111111 }, 0.3, 1, 148.0, 1.0 }, |
| { 1, { 0.01111111111 }, 1.0, 1, 155.0, 1.0 }, |
| { 1, { 0.01111111111 }, 1.001, 1, 148.0, 1.0 }, |
| { 2, { 0.011111, 0.324 }, 1.9999, 2, 147.0, 1.0 }, |
| { 2, { 0.012345, 0.457 }, 0.456789, 1, 148.0, 0.5 }, |
| { 2, { 0.011111, 0.45 }, 0.6, 1, 149.0, 0.5 }, |
| { 1, { 0.43111111111 }, 1.33, 1, 145.0, 1.0 } |
| } |
| }, |
| } ; /* snr_test_data */ |
| |
| double best_snr, snr, freq3dB ; |
| int j, k, converter, verbose = 0 ; |
| |
| if (argc == 2 && strcmp (argv [1], "--verbose") == 0) |
| verbose = 1 ; |
| |
| puts ("") ; |
| |
| for (j = 0 ; j < ARRAY_LEN (snr_test_data) ; j++) |
| { best_snr = 5000.0 ; |
| |
| converter = snr_test_data [j].converter ; |
| |
| printf (" Converter %d : %s\n", converter, src_get_name (converter)) ; |
| printf (" %s\n", src_get_description (converter)) ; |
| |
| for (k = 0 ; k < snr_test_data [j].tests ; k++) |
| { snr = snr_test (&(snr_test_data [j].test_data [k]), k, converter, verbose) ; |
| if (best_snr > snr) |
| best_snr = snr ; |
| } ; |
| |
| printf (" Worst case Signal-to-Noise Ratio : %.2f dB.\n", best_snr) ; |
| |
| if (snr_test_data [j].do_bandwidth_test == BOOLEAN_FALSE) |
| { puts (" Bandwith test not performed on this converter.\n") ; |
| continue ; |
| } |
| |
| freq3dB = bandwidth_test (converter, verbose) ; |
| |
| printf (" Measured -3dB rolloff point : %5.2f %%.\n\n", freq3dB) ; |
| } ; |
| |
| return 0 ; |
| } /* main */ |
| |
| /*============================================================================== |
| */ |
| |
| static double |
| snr_test (SINGLE_TEST *test_data, int number, int converter, int verbose) |
| { static float data [BUFFER_LEN + 1] ; |
| static float output [MAX_SPEC_LEN] ; |
| |
| SRC_STATE *src_state ; |
| SRC_DATA src_data ; |
| |
| double output_peak, snr ; |
| int k, output_len, input_len, error ; |
| |
| if (verbose != 0) |
| { printf ("\tSignal-to-Noise Ratio Test %d.\n" |
| "\t=====================================\n", number) ; |
| printf ("\tFrequencies : [ ") ; |
| for (k = 0 ; k < test_data->freq_count ; k++) |
| printf ("%6.4f ", test_data->freqs [k]) ; |
| |
| printf ("]\n\tSRC Ratio : %8.4f\n", test_data->src_ratio) ; |
| } |
| else |
| { printf ("\tSignal-to-Noise Ratio Test %d : ", number) ; |
| fflush (stdout) ; |
| } ; |
| |
| /* Set up the output array. */ |
| if (test_data->src_ratio >= 1.0) |
| { output_len = MAX_SPEC_LEN ; |
| input_len = (int) ceil (MAX_SPEC_LEN / test_data->src_ratio) ; |
| if (input_len > BUFFER_LEN) |
| input_len = BUFFER_LEN ; |
| } |
| else |
| { input_len = BUFFER_LEN ; |
| output_len = (int) ceil (BUFFER_LEN * test_data->src_ratio) ; |
| output_len &= ((-1) << 4) ; |
| if (output_len > MAX_SPEC_LEN) |
| output_len = MAX_SPEC_LEN ; |
| input_len = (int) ceil (output_len / test_data->src_ratio) ; |
| } ; |
| |
| memset (output, 0, sizeof (output)) ; |
| |
| /* Generate input data array. */ |
| gen_windowed_sines (test_data->freq_count, test_data->freqs, 1.0, data, 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 ; /* Only one buffer worth of input. */ |
| |
| src_data.data_in = data ; |
| src_data.input_frames = input_len ; |
| |
| src_data.src_ratio = test_data->src_ratio ; |
| |
| src_data.data_out = output ; |
| src_data.output_frames = output_len ; |
| |
| if ((error = src_process (src_state, &src_data))) |
| { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; |
| exit (1) ; |
| } ; |
| |
| src_state = src_delete (src_state) ; |
| |
| if (verbose != 0) |
| printf ("\tOutput Len : %ld\n", src_data.output_frames_gen) ; |
| |
| if (abs (src_data.output_frames_gen - output_len) > 4) |
| { printf ("\n\nLine %d : output data length should be %d.\n\n", __LINE__, output_len) ; |
| exit (1) ; |
| } ; |
| |
| /* Check output peak. */ |
| output_peak = find_peak (output, src_data.output_frames_gen) ; |
| |
| if (verbose != 0) |
| printf ("\tOutput Peak : %6.4f\n", output_peak) ; |
| |
| if (fabs (output_peak - test_data->peak_value) > 0.01) |
| { printf ("\n\nLine %d : output peak (%6.4f) should be %6.4f\n\n", __LINE__, output_peak, test_data->peak_value) ; |
| save_oct_float ("snr_test.dat", data, BUFFER_LEN, output, output_len) ; |
| exit (1) ; |
| } ; |
| |
| /* Calculate signal-to-noise ratio. */ |
| snr = calculate_snr (output, src_data.output_frames_gen, test_data->pass_band_peaks) ; |
| |
| if (snr < 0.0) |
| { /* An error occurred. */ |
| save_oct_float ("snr_test.dat", data, BUFFER_LEN, output, src_data.output_frames_gen) ; |
| exit (1) ; |
| } ; |
| |
| if (verbose != 0) |
| printf ("\tSNR Ratio : %.2f dB\n", snr) ; |
| |
| if (snr < test_data->snr) |
| { printf ("\n\nLine %d : SNR (%5.2f) should be > %6.2f dB\n\n", __LINE__, snr, test_data->snr) ; |
| exit (1) ; |
| } ; |
| |
| if (verbose != 0) |
| puts ("\t-------------------------------------\n\tPass\n") ; |
| else |
| puts ("Pass") ; |
| |
| return snr ; |
| } /* snr_test */ |
| |
| static double |
| find_peak (float *data, int len) |
| { double peak = 0.0 ; |
| int k = 0 ; |
| |
| for (k = 0 ; k < len ; k++) |
| if (fabs (data [k]) > peak) |
| peak = fabs (data [k]) ; |
| |
| return peak ; |
| } /* find_peak */ |
| |
| |
| static double |
| find_attenuation (double freq, int converter, int verbose) |
| { static float input [BUFFER_LEN] ; |
| static float output [2 * BUFFER_LEN] ; |
| |
| SRC_DATA src_data ; |
| double output_peak ; |
| int error ; |
| |
| gen_windowed_sines (1, &freq, 1.0, input, BUFFER_LEN) ; |
| |
| src_data.end_of_input = 1 ; /* Only one buffer worth of input. */ |
| |
| src_data.data_in = input ; |
| src_data.input_frames = BUFFER_LEN ; |
| |
| src_data.src_ratio = 1.999 ; |
| |
| src_data.data_out = output ; |
| src_data.output_frames = ARRAY_LEN (output) ; |
| |
| if ((error = src_simple (&src_data, converter, 1))) |
| { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; |
| exit (1) ; |
| } ; |
| |
| output_peak = find_peak (output, ARRAY_LEN (output)) ; |
| |
| if (verbose) |
| printf ("\tFreq : %6f InPeak : %6f OutPeak : %6f Atten : %6.2f dB\n", |
| freq, 1.0, output_peak, 20.0 * log10 (1.0 / output_peak)) ; |
| |
| return 20.0 * log10 (1.0 / output_peak) ; |
| } /* find_attenuation */ |
| |
| static double |
| bandwidth_test (int converter, int verbose) |
| { double f1, f2, a1, a2 ; |
| double freq, atten ; |
| |
| f1 = 0.35 ; |
| a1 = find_attenuation (f1, converter, verbose) ; |
| |
| f2 = 0.495 ; |
| a2 = find_attenuation (f2, converter, verbose) ; |
| |
| if (a1 > 3.0 || a2 < 3.0) |
| { printf ("\n\nLine %d : cannot bracket 3dB point.\n\n", __LINE__) ; |
| exit (1) ; |
| } ; |
| |
| while (a2 - a1 > 1.0) |
| { freq = f1 + 0.5 * (f2 - f1) ; |
| atten = find_attenuation (freq, converter, verbose) ; |
| |
| if (atten < 3.0) |
| { f1 = freq ; |
| a1 = atten ; |
| } |
| else |
| { f2 = freq ; |
| a2 = atten ; |
| } ; |
| } ; |
| |
| freq = f1 + (3.0 - a1) * (f2 - f1) / (a2 - a1) ; |
| |
| return 200.0 * freq ; |
| } /* bandwidth_test */ |
| |
| #else /* (HAVE_FFTW3) == 0 */ |
| |
| /* Alternative main function when librfftw is not available. */ |
| |
| int |
| main (void) |
| { puts ("\n" |
| "****************************************************************\n" |
| " This test cannot be run without FFTW (http://www.fftw.org/).\n" |
| " Both the real and the complex versions of the library are\n" |
| " required.") ; |
| puts ("****************************************************************\n") ; |
| |
| return 0 ; |
| } /* main */ |
| |
| #endif |
| |