cannam@126: /* cannam@126: ** Copyright (c) 2006-2016, Erik de Castro Lopo cannam@126: ** All rights reserved. cannam@126: ** cannam@126: ** This code is released under 2-clause BSD license. Please see the cannam@126: ** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING cannam@126: */ cannam@126: cannam@126: #include "config.h" cannam@126: cannam@126: #include cannam@126: #include cannam@126: #include cannam@126: #include cannam@126: cannam@126: #include cannam@126: cannam@126: #include "util.h" cannam@126: cannam@126: #if HAVE_FFTW3 cannam@126: #include cannam@126: #else cannam@126: #define fftw_cleanup() cannam@126: #endif cannam@126: cannam@126: #define BUFFER_LEN (1 << 16) cannam@126: cannam@126: static void varispeed_test (int converter, double target_snr) ; cannam@126: cannam@126: int cannam@126: main (void) cannam@126: { cannam@126: puts ("") ; cannam@126: printf (" Zero Order Hold interpolator : ") ; cannam@126: varispeed_test (SRC_ZERO_ORDER_HOLD, 10.0) ; cannam@126: cannam@126: printf (" Linear interpolator : ") ; cannam@126: varispeed_test (SRC_LINEAR, 10.0) ; cannam@126: cannam@126: printf (" Sinc interpolator : ") ; cannam@126: varispeed_test (SRC_SINC_FASTEST, 115.0) ; cannam@126: cannam@126: fftw_cleanup () ; cannam@126: puts ("") ; cannam@126: cannam@126: return 0 ; cannam@126: } /* main */ cannam@126: cannam@126: static void cannam@126: varispeed_test (int converter, double target_snr) cannam@126: { static float input [BUFFER_LEN], output [BUFFER_LEN] ; cannam@126: double sine_freq, snr ; cannam@126: cannam@126: SRC_STATE *src_state ; cannam@126: SRC_DATA src_data ; cannam@126: cannam@126: int input_len, error ; cannam@126: cannam@126: memset (input, 0, sizeof (input)) ; cannam@126: cannam@126: input_len = ARRAY_LEN (input) / 2 ; cannam@126: cannam@126: sine_freq = 0.0111 ; cannam@126: gen_windowed_sines (1, &sine_freq, 1.0, input, input_len) ; cannam@126: cannam@126: /* Perform sample rate conversion. */ cannam@126: if ((src_state = src_new (converter, 1, &error)) == NULL) cannam@126: { printf ("\n\nLine %d : src_new() failed : %s\n\n", __LINE__, src_strerror (error)) ; cannam@126: exit (1) ; cannam@126: } ; cannam@126: cannam@126: src_data.end_of_input = 1 ; cannam@126: cannam@126: src_data.data_in = input ; cannam@126: src_data.input_frames = input_len ; cannam@126: cannam@126: src_data.src_ratio = 3.0 ; cannam@126: cannam@126: src_data.data_out = output ; cannam@126: src_data.output_frames = ARRAY_LEN (output) ; cannam@126: cannam@126: if ((error = src_set_ratio (src_state, 1.0 / src_data.src_ratio))) cannam@126: { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; cannam@126: exit (1) ; cannam@126: } ; cannam@126: cannam@126: if ((error = src_process (src_state, &src_data))) cannam@126: { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; cannam@126: printf (" src_data.input_frames : %ld\n", src_data.input_frames) ; cannam@126: printf (" src_data.output_frames : %ld\n\n", src_data.output_frames) ; cannam@126: exit (1) ; cannam@126: } ; cannam@126: cannam@126: if (src_data.input_frames_used != input_len) cannam@126: { printf ("\n\nLine %d : unused input.\n", __LINE__) ; cannam@126: printf ("\tinput_len : %d\n", input_len) ; cannam@126: printf ("\tinput_frames_used : %ld\n\n", src_data.input_frames_used) ; cannam@126: exit (1) ; cannam@126: } ; cannam@126: cannam@126: /* Copy the last output to the input. */ cannam@126: memcpy (input, output, sizeof (input)) ; cannam@126: reverse_data (input, src_data.output_frames_gen) ; cannam@126: cannam@126: if ((error = src_reset (src_state))) cannam@126: { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; cannam@126: exit (1) ; cannam@126: } ; cannam@126: cannam@126: src_data.end_of_input = 1 ; cannam@126: cannam@126: src_data.data_in = input ; cannam@126: input_len = src_data.input_frames = src_data.output_frames_gen ; cannam@126: cannam@126: src_data.data_out = output ; cannam@126: src_data.output_frames = ARRAY_LEN (output) ; cannam@126: cannam@126: if ((error = src_set_ratio (src_state, 1.0 / src_data.src_ratio))) cannam@126: { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; cannam@126: exit (1) ; cannam@126: } ; cannam@126: cannam@126: if ((error = src_process (src_state, &src_data))) cannam@126: { printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ; cannam@126: printf (" src_data.input_frames : %ld\n", src_data.input_frames) ; cannam@126: printf (" src_data.output_frames : %ld\n\n", src_data.output_frames) ; cannam@126: exit (1) ; cannam@126: } ; cannam@126: cannam@126: if (src_data.input_frames_used != input_len) cannam@126: { printf ("\n\nLine %d : unused input.\n", __LINE__) ; cannam@126: printf ("\tinput_len : %d\n", input_len) ; cannam@126: printf ("\tinput_frames_used : %ld\n\n", src_data.input_frames_used) ; cannam@126: exit (1) ; cannam@126: } ; cannam@126: cannam@126: src_state = src_delete (src_state) ; cannam@126: cannam@126: snr = calculate_snr (output, src_data.output_frames_gen, 1) ; cannam@126: cannam@126: if (target_snr > snr) cannam@126: { printf ("\n\nLine %d : snr (%3.1f) does not meet target (%3.1f)\n\n", __LINE__, snr, target_snr) ; cannam@126: save_oct_float ("varispeed.mat", input, src_data.input_frames, output, src_data.output_frames_gen) ; cannam@126: exit (1) ; cannam@126: } ; cannam@126: cannam@126: puts ("ok") ; cannam@126: cannam@126: return ; cannam@126: } /* varispeed_test */ cannam@126: