70 lines
3.5 KiB
C
70 lines
3.5 KiB
C
/* Generate matched raw/smoothed previews for human listening; never plays audio.
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* Usage: quality-preview /absolute/path/prefix (writes prefix-{raw,smooth}.wav). */
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#include "xtc/xtc_audio.h"
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#include "xtc/xtc_midi.h"
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#include "xtc/xtc_dsp.h"
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static xtc_result preview(const char *prefix, int smooth)
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{
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xtc_project *project = NULL;
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xtc_midi_plan *midi = NULL;
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xtc_recorder *recorder = NULL;
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xtc_gain_ramp ramp;
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uint64_t track, clip, note, position;
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char path[1024];
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xtc_result result;
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int n = snprintf(path, sizeof(path), "%s-%s.wav", prefix, smooth ? "smooth" : "raw");
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if (n < 0 || (size_t)n >= sizeof(path)) return XTC_ERR_CAPACITY;
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result = xtc_project_create(&project);
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if (result == XTC_OK) result = xtc_project_add_track(project, "Listening phrase", &track);
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if (result == XTC_OK) result = xtc_project_add_midi_clip(project, track, 0, 7680, &clip);
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if (result == XTC_OK) result = xtc_project_add_note(project, clip, 0, 480, 60, 100, 0, ¬e);
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if (result == XTC_OK) result = xtc_project_add_note(project, clip, 720, 480, 64, 100, 0, ¬e);
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if (result == XTC_OK) result = xtc_project_add_note(project, clip, 1440, 1440, 67, 100, 0, ¬e);
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if (result == XTC_OK) result = xtc_midi_plan_create(project, 48000, &midi);
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if (result == XTC_OK) result = xtc_midi_plan_set_fade_frames(midi, smooth ? 240U : 0U);
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if (result == XTC_OK) result = xtc_recorder_create_replace(path, 48000, 256, 1, &recorder);
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(void)xtc_gain_ramp_reset(&ramp, smooth ? 0 : 1);
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(void)xtc_gain_ramp_target(&ramp, 1, smooth ? 240U : 0U);
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for (position = 0; result == XTC_OK && position < 192000; position += 256) {
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float samples[256];
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size_t i;
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result = xtc_midi_plan_render(midi, position, NULL, 0, samples, 256);
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if (result != XTC_OK) break;
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for (i = 0; i < 256; ++i) {
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uint64_t sample = position + i;
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/* Deliberately abrupt constant clips with 5 ms fades in the smooth
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* version, followed by a tone stopped mid-period at three seconds. */
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if (sample >= 96000 && sample < 108000) {
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uint64_t age = sample - 96000, tail = 107999 - sample;
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uint64_t distance = age < tail ? age : tail;
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float envelope = smooth && distance < 240 ? (float)distance / 240.0f : 1;
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samples[i] += 0.2f * envelope;
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}
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if (sample >= 120000 && sample < 144000)
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samples[i] += 0.2f * (float)sin(6.283185307179586 * 443.0 * (double)(sample - 120000) / 48000.0);
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if (sample == 143760)
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(void)xtc_gain_ramp_target(&ramp, 0, smooth ? 240U : 0U);
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(void)xtc_gain_ramp_process(&ramp, samples + i, NULL, 1);
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}
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xtc_recorder_push(recorder, samples, 256);
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result = xtc_recorder_drain(recorder);
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}
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if (result == XTC_OK) result = xtc_recorder_finish(recorder);
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xtc_recorder_destroy(recorder); xtc_midi_plan_destroy(midi); xtc_project_destroy(project);
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if (result == XTC_OK) printf("Wrote %s\n", path);
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return result;
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}
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int main(int argc, char **argv)
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{
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xtc_result result;
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if (argc != 2) { fprintf(stderr, "Usage: %s OUTPUT_PREFIX\n", argv[0]); return EXIT_FAILURE; }
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result = preview(argv[1], 0);
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if (result == XTC_OK) result = preview(argv[1], 1);
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if (result != XTC_OK) { fprintf(stderr, "%s\n", xtc_result_string(result)); return EXIT_FAILURE; }
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return EXIT_SUCCESS;
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}
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