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#include <gavl/gavl.h>
#include <gavl/peakdetector.h>
#include <stdio.h>
#include <assert.h>
void print_audioframe(gavl_audio_frame_t*frame, int channels, int with_samples) {
int i, j;
printf("audio-frame @ %p\n", frame);
printf("\ttime : %lld\n", (long long)frame->timestamp);
printf("\tstride : %d\n", frame->channel_stride);
printf("\tsamples: %d\n", frame->valid_samples);
printf("\tsamples: %p\n", frame->samples.f);
for (i=0; i<channels; i++) {
printf("\t [%d]: %p\n", i, frame->channels.f[i]);
}
}
int main() {
int i;
float*left, *right;
double min, max, abs;
gavl_peak_detector_t* pd = 0;
gavl_audio_frame_t* frame = 0;
gavl_audio_format_t fmt = {
.samples_per_frame=64,
.samplerate=44100,
.num_channels=2,
.sample_format=GAVL_SAMPLE_FLOAT,
.interleave_mode=GAVL_INTERLEAVE_ALL,
.center_level=1.f,
.rear_level=1.f,
};
fmt.channel_locations[0] = GAVL_CHID_FRONT_LEFT;
fmt.channel_locations[1] = GAVL_CHID_FRONT_RIGHT;
//gavl_audio_format_dump(&fmt);
frame = gavl_audio_frame_create (&fmt);
assert(frame);
/* fill the audio frame */
left = frame->channels.f[0];
right = frame->channels.f[1];
for(i=0; i<fmt.samples_per_frame; i++) {
*left++ = ((float)i)/((float)fmt.samples_per_frame) * 1.5f - 0.5;
*right++ = 0.f;
}
frame->valid_samples=fmt.samples_per_frame;
/* print the audio frames */
print_audioframe(frame, fmt.num_channels, 0);
/* detect peaks */
pd = gavl_peak_detector_create ();
assert(pd);
gavl_peak_detector_set_format(pd, &fmt);
gavl_peak_detector_update(pd, frame);
gavl_peak_detector_get_peak(pd, &min, &max, &abs);
printf("min=%g, max=%g, abs=%g\n", min, max, abs);
/* cleanup */
gavl_peak_detector_destroy(pd);
gavl_audio_frame_destroy(frame);
/* check if values are correct */
assert(min == -0.5);
assert(max == ((1.5f*63.)/64. - 0.5));
assert(max == abs);
return 0;
}
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