ref: 8eee071d73c7f0bd42b22632e0c3fc8398bc8c77
dir: /tests/simple_test.c/
/* ** Copyright (c) 2002-2016, Erik de Castro Lopo <[email protected]> ** All rights reserved. ** ** This code is released under 2-clause BSD license. Please see the ** file at : https://github.com/libsndfile/libsamplerate/blob/master/COPYING */ #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) ; static void src_simple_produces_output (int converter, int channels, double src_ratio) ; static void src_simple_produces_output_test (int converter, double src_ratio) ; int main (void) { static double src_ratios [] = { 1.0001, 0.099, 0.1, 0.33333333, 0.789, 1.9, 3.1, 9.9, 256.0, 1.0 / 256.0 } ; 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]) ; src_simple_produces_output_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]) ; src_simple_produces_output_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]) ; src_simple_produces_output_test (SRC_SINC_FASTEST, src_ratios [k]) ; } puts ("") ; return 0 ; } /* main */ static void src_simple_produces_output_test (int converter, double src_ratio) { for (int channels = 1; channels <= 9; channels++) src_simple_produces_output(converter, channels, src_ratio); } static void src_simple_produces_output (int converter, int channels, double src_ratio) { // Choose a suitable number of frames. // At least 256 so a conversion ratio of 1/256 can produce any output const long NUM_FRAMES = 1000; int error; printf ("\tproduces_output\t(SRC ratio = %6.4f, channels = %d) ... ", src_ratio, channels) ; fflush (stdout) ; float *input = calloc (NUM_FRAMES * channels, sizeof (float)); float *output = calloc (NUM_FRAMES * channels, sizeof (float)); SRC_DATA src_data; memset (&src_data, 0, sizeof (src_data)) ; src_data.data_in = input; src_data.data_out = output; src_data.input_frames = NUM_FRAMES; src_data.output_frames = NUM_FRAMES; src_data.src_ratio = src_ratio; if ((error = src_simple (&src_data, converter, channels))) { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; exit (1) ; } ; if (src_data.input_frames_used == 0) { printf ("\n\nLine %d : No input frames used.\n\n", __LINE__) ; exit (1) ; } ; if (src_data.output_frames_gen == 0) { printf ("\n\nLine %d : No output frames generated.\n\n", __LINE__) ; exit (1) ; } ; free(input); free(output); puts ("ok") ; } 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\t(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 */