ref: 313685a7a94db5e8147c470ced811f03f3d2733c
dir: /tests/streaming_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/erikd/libsamplerate/blob/master/COPYING */ #include <stdlib.h> #include <stdio.h> #include <math.h> #include <samplerate.h> #include "util.h" #define BUFFER_LEN (1<<15) #define BLOCK_LEN 100 static void stream_test (int converter, double ratio) ; int main (void) { static double src_ratios [] = { 0.3, 0.9, 1.1, 3.0 } ; int k ; puts ("\n Zero Order Hold interpolator:") ; for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++) stream_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ; puts ("\n Linear interpolator:") ; for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++) stream_test (SRC_LINEAR, src_ratios [k]) ; puts ("\n Sinc interpolator:") ; for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++) stream_test (SRC_SINC_FASTEST, src_ratios [k]) ; puts ("") ; return 0 ; } /* main */ static void stream_test (int converter, double src_ratio) { static float input [BUFFER_LEN], output [BUFFER_LEN] ; SRC_STATE *src_state ; SRC_DATA src_data ; int input_len, output_len, current_in, current_out ; int error, terminate ; printf ("\tstreaming_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) ; } ; current_in = current_out = 0 ; /* 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 = 0 ; /* Set this later. */ src_data.data_in = input ; src_data.input_frames = BLOCK_LEN ; src_data.src_ratio = src_ratio ; src_data.data_out = output ; src_data.output_frames = BLOCK_LEN ; while (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", src_data.output_frames) ; exit (1) ; } ; if (src_data.end_of_input && src_data.output_frames_gen == 0) break ; current_in += src_data.input_frames_used ; current_out += src_data.output_frames_gen ; src_data.data_in += src_data.input_frames_used ; src_data.data_out += src_data.output_frames_gen ; src_data.input_frames = MIN (BLOCK_LEN, input_len - current_in) ; src_data.output_frames = MIN (BLOCK_LEN, output_len - current_out) ; src_data.end_of_input = (current_in >= input_len) ? 1 : 0 ; } ; src_state = src_delete (src_state) ; terminate = (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ; if (fabs (current_out - src_ratio * input_len) > 2 * terminate) { printf ("\n\nLine %d : bad output data length %d should be %d.\n", __LINE__, current_out, (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) ; } ; if (current_in != input_len) { printf ("\n\nLine %d : unused input.\n", __LINE__) ; printf ("\tinput_len : %d\n", input_len) ; printf ("\tinput_frames_used : %d\n\n", current_in) ; exit (1) ; } ; puts ("ok") ; return ; } /* stream_test */