From 633bac9e82aef192a803666aaf3d3dcff920ac0c Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Wed, 13 Jul 2016 11:25:59 +0200
Subject: Use the latency reported by the engine in the jack and wavfile output
 modules.

---
 drumgizmo/output/jackaudio.cc | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'drumgizmo/output/jackaudio.cc')

diff --git a/drumgizmo/output/jackaudio.cc b/drumgizmo/output/jackaudio.cc
index abd7d4f..75766d1 100644
--- a/drumgizmo/output/jackaudio.cc
+++ b/drumgizmo/output/jackaudio.cc
@@ -33,6 +33,7 @@ JackAudioOutputEngine::JackAudioOutputEngine(JackClient& client)
 	: AudioOutputEngine{}
 	, client(client)
 	, channels{}
+	, latency{0}
 {
 	client.add(*this);
 }
@@ -122,6 +123,11 @@ size_t JackAudioOutputEngine::getSamplerate() const
 	return client.getSampleRate();
 }
 
+void JackAudioOutputEngine::onLatencyChange(std::size_t latency)
+{
+	this->latency = latency;
+}
+
 JackAudioOutputEngine::Channel::Channel(JackClient& client,
                                         const std::string& name,
                                         std::size_t buffer_size)
@@ -130,3 +136,33 @@ JackAudioOutputEngine::Channel::Channel(JackClient& client,
 {
 	samples.resize(buffer_size);
 }
+
+void JackAudioOutputEngine::jackLatencyCallback(jack_latency_callback_mode_t mode)
+{
+	jack_latency_range_t range;
+	switch(mode)
+	{
+	case JackCaptureLatency:
+		// We do not have any audio input ports. Use this for when we do...
+//		jack_port_get_latency_range(port_feeding_input_port,
+//		                            JackPlaybackLatency,
+//		                            &range);
+//		range.min += 0;
+//		range.max += 0;
+//		jack_port_set_latency_range(input_port, JackPlaybackLatency, &range);
+		break;
+	case JackPlaybackLatency:
+		for(auto& channel : channels)
+		{
+			jack_port_get_latency_range(channel.port.port,
+			                            JackPlaybackLatency,
+			                            &range);
+			range.min += latency;
+			range.max += latency;
+			jack_port_set_latency_range(channel.port.port,
+			                            JackPlaybackLatency,
+			                            &range);
+		}
+		break;
+	}
+}
-- 
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