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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| /* | ||
| ** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com> | ||
| ** 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 | ||
| */ | ||
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| #ifdef HAVE_CONFIG_H | ||
| #include "config.h" | ||
| #endif | ||
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| #include <math.h> | ||
| #include <samplerate.h> | ||
| #include <stdint.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
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| #include "util.h" | ||
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| #define BUFFER_LEN (1 << 15) | ||
| #define INPUT_BUFFER_LEN (BUFFER_LEN) | ||
| #define OUTPUT_BUFFER_LEN (BUFFER_LEN) | ||
| #define BLOCK_LEN 192 | ||
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| static void vari_stream_test(int converter, double ratio); | ||
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| int main(void) { | ||
| static double src_ratios[] = {0.3, 0.9, 1.1, 3.0}; | ||
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| int k; | ||
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| puts("\n Zero Order Hold interpolator:"); | ||
| for (k = 0; k < ARRAY_LEN(src_ratios); k++) | ||
| vari_stream_test(SRC_ZERO_ORDER_HOLD, src_ratios[k]); | ||
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| puts("\n Linear interpolator:"); | ||
| for (k = 0; k < ARRAY_LEN(src_ratios); k++) | ||
| vari_stream_test(SRC_LINEAR, src_ratios[k]); | ||
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| puts("\n Sinc interpolator:"); | ||
| for (k = 0; k < ARRAY_LEN(src_ratios); k++) | ||
| vari_stream_test(SRC_SINC_FASTEST, src_ratios[k]); | ||
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| puts(""); | ||
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| return 0; | ||
| } /* main */ | ||
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| struct generate_waveform_state_s { | ||
| float phase; | ||
| float phase_increment; | ||
| }; | ||
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| static void generate_waveform(struct generate_waveform_state_s* state, float* output, size_t len) { | ||
| for(size_t n = 0; n < len; ++n) { | ||
| output[n] = state->phase; | ||
| state->phase += state->phase_increment; | ||
| if (state->phase > 1.0 || state->phase < -1.0) | ||
| state->phase = state->phase > 0 ? -1.0 : 1.0; | ||
| } | ||
| } | ||
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| static void vari_stream_test(int converter, double src_ratio) { | ||
| float input[INPUT_BUFFER_LEN], output[OUTPUT_BUFFER_LEN]; | ||
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| SRC_STATE *src_state; | ||
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| int error, terminate; | ||
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| printf("\tvari_streaming_test (SRC ratio = %6.4f) ........... ", src_ratio); | ||
| fflush(stdout); | ||
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| /* 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); | ||
| }; | ||
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| struct generate_waveform_state_s generator = { | ||
| .phase = 0.0, | ||
| .phase_increment = 2 / 48000, // 1Hz at 48000kHz samplerate. | ||
| }; | ||
|
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| double resampled_time = 0; | ||
| const size_t input_period_sizes[] = { | ||
| BLOCK_LEN, | ||
| BLOCK_LEN, | ||
| BLOCK_LEN, | ||
| 1, | ||
| BLOCK_LEN, | ||
| }; | ||
|
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| int num_input_frame_used = 0; | ||
| int num_frames_outputed = 0; | ||
| int total_num_input_frames = 0; | ||
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| int current_num_frames = 0; | ||
| for (size_t n = 0; n < ARRAY_LEN(input_period_sizes); ++n) { | ||
| generate_waveform(&generator, input, input_period_sizes[n]); | ||
| total_num_input_frames += input_period_sizes[n]; | ||
| current_num_frames += input_period_sizes[n]; | ||
| SRC_DATA src_data = { | ||
| .data_in = input, | ||
| .data_out = output, | ||
| .input_frames = input_period_sizes[n], | ||
| .output_frames = OUTPUT_BUFFER_LEN, | ||
| .input_frames_used = 0, | ||
| .output_frames_gen = 0, | ||
| .end_of_input = n == ARRAY_LEN(input_period_sizes) - 1, | ||
| .src_ratio = src_ratio, | ||
| }; | ||
| // printf("eoi: %d\n", src_data.end_of_input); | ||
| if ((error = src_process(src_state, &src_data))) { | ||
| printf("\n\nLine %d : %s\n\n", __LINE__, src_strerror(error)); | ||
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| printf("src_data.input_frames : %ld\n", src_data.input_frames); | ||
| printf("src_data.output_frames : %ld\n", src_data.output_frames); | ||
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| exit(1); | ||
| }; | ||
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| num_input_frame_used += src_data.input_frames_used; | ||
| num_frames_outputed += src_data.output_frames_gen; | ||
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| memmove( | ||
| input, | ||
| input + src_data.input_frames_used, | ||
| (INPUT_BUFFER_LEN - src_data.input_frames_used) * sizeof(input[0]) | ||
| ); | ||
| current_num_frames -= src_data.input_frames_used; | ||
| if (src_data.end_of_input) break; | ||
| }; | ||
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| src_state = src_delete(src_state); | ||
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| terminate = (int)ceil((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio); | ||
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| if (fabs(num_frames_outputed - src_ratio * total_num_input_frames) > 2 * terminate) { | ||
| printf("\n\nLine %d : bad output data length %d should be %d.\n", __LINE__, | ||
| num_frames_outputed, (int)floor(src_ratio * total_num_input_frames)); | ||
| printf("\tsrc_ratio : %.4f\n", src_ratio); | ||
| printf("\tinput_len : %d\n\toutput_len : %d\n\n", total_num_input_frames, num_frames_outputed); | ||
| exit(1); | ||
| }; | ||
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| if (num_input_frame_used != total_num_input_frames) { | ||
| printf("\n\nLine %d : unused %d input frames.\n", __LINE__, current_num_frames); | ||
| printf("\tinput_len : %d\n", total_num_input_frames); | ||
| printf("\tinput_frames_used : %d\n\n", num_input_frame_used); | ||
| exit(1); | ||
| }; | ||
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| puts("ok"); | ||
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| return; | ||
| } /* stream_test */ |