X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=nageru%2Faudio_clip.cpp;fp=nageru%2Faudio_clip.cpp;h=4dcb8db0135e4077d15e87fda3a942ad548c2b73;hb=bd01e11a41a19fef2315319909d8655cac359f0f;hp=0000000000000000000000000000000000000000;hpb=a944bad466ba5601a96f6833e1ea2eb31f9b55af;p=nageru

diff --git a/nageru/audio_clip.cpp b/nageru/audio_clip.cpp
new file mode 100644
index 0000000..4dcb8db
--- /dev/null
+++ b/nageru/audio_clip.cpp
@@ -0,0 +1,58 @@
+#include "audio_clip.h"
+
+#include <math.h>
+
+using namespace std;
+using namespace std::chrono;
+
+void AudioClip::clear()
+{
+	lock_guard<mutex> lock(mu);
+	vals.clear();
+}
+
+void AudioClip::add_audio(const float *samples, size_t num_samples, double sample_rate, std::chrono::steady_clock::time_point frame_time)
+{
+	lock_guard<mutex> lock(mu);
+	if (!vals.empty() && sample_rate != this->sample_rate) {
+		vals.clear();
+	}
+	if (vals.empty()) {
+		first_sample = frame_time;
+	}
+	this->sample_rate = sample_rate;
+	vals.insert(vals.end(), samples, samples + num_samples);
+}
+
+double AudioClip::get_length_seconds() const
+{
+	lock_guard<mutex> lock(mu);
+	if (vals.empty()) {
+		return 0.0;
+	}
+
+	return double(vals.size()) / sample_rate;
+}
+
+
+unique_ptr<pair<float, float>[]> AudioClip::get_min_max_peaks(unsigned width) const
+{
+	unique_ptr<pair<float, float>[]> min_max(new pair<float, float>[width]);
+	for (unsigned x = 0; x < width; ++x) {
+		min_max[x].first = min_max[x].second = 0.0 / 0.0;  // NaN.
+	}
+
+	lock_guard<mutex> lock(mu);
+	for (size_t i = 0; i < vals.size(); ++i) {
+		// We display one second.
+		int x = lrint(i * (double(width) / sample_rate));
+		if (x < 0 || x >= int(width)) continue;
+		if (isnan(min_max[x].first)) {
+			min_max[x].first = min_max[x].second = 0.0;
+		}
+		min_max[x].first = min(min_max[x].first, vals[i]);
+		min_max[x].second = max(min_max[x].second, vals[i]);
+	}
+
+	return min_max;
+}