From 0e3cab41ebac855fbf13b4c409e42d2661c5842b Mon Sep 17 00:00:00 2001
From: Ellen Poe <ellenhp@google.com>
Date: Fri, 27 Aug 2021 21:51:03 -0700
Subject: Add polyphony to Audio Stream Player nodes

---
 servers/audio/audio_stream.cpp                   | 22 ++++++++++++++++++++++
 servers/audio/audio_stream.h                     |  5 +++++
 servers/audio/effects/audio_stream_generator.cpp |  4 ++++
 servers/audio/effects/audio_stream_generator.h   |  1 +
 4 files changed, 32 insertions(+)

(limited to 'servers/audio')

diff --git a/servers/audio/audio_stream.cpp b/servers/audio/audio_stream.cpp
index e1b391b823..c098a97906 100644
--- a/servers/audio/audio_stream.cpp
+++ b/servers/audio/audio_stream.cpp
@@ -189,11 +189,21 @@ float AudioStream::get_length() const {
 	return 0;
 }
 
+bool AudioStream::is_monophonic() const {
+	bool ret;
+	if (GDVIRTUAL_CALL(_is_monophonic, ret)) {
+		return ret;
+	}
+	return true;
+}
+
 void AudioStream::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_length"), &AudioStream::get_length);
+	ClassDB::bind_method(D_METHOD("is_monophonic"), &AudioStream::is_monophonic);
 	GDVIRTUAL_BIND(_instance_playback);
 	GDVIRTUAL_BIND(_get_stream_name);
 	GDVIRTUAL_BIND(_get_length);
+	GDVIRTUAL_BIND(_is_monophonic);
 }
 
 ////////////////////////////////
@@ -221,6 +231,10 @@ float AudioStreamMicrophone::get_length() const {
 	return 0;
 }
 
+bool AudioStreamMicrophone::is_monophonic() const {
+	return true;
+}
+
 void AudioStreamMicrophone::_bind_methods() {
 }
 
@@ -388,6 +402,14 @@ float AudioStreamRandomPitch::get_length() const {
 	return 0;
 }
 
+bool AudioStreamRandomPitch::is_monophonic() const {
+	if (audio_stream.is_valid()) {
+		return audio_stream->is_monophonic();
+	}
+
+	return true; // It doesn't really matter what we return here, but no sense instancing a many playbacks of a null stream.
+}
+
 void AudioStreamRandomPitch::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_audio_stream", "stream"), &AudioStreamRandomPitch::set_audio_stream);
 	ClassDB::bind_method(D_METHOD("get_audio_stream"), &AudioStreamRandomPitch::get_audio_stream);
diff --git a/servers/audio/audio_stream.h b/servers/audio/audio_stream.h
index 922335508e..12d4343f5c 100644
--- a/servers/audio/audio_stream.h
+++ b/servers/audio/audio_stream.h
@@ -102,12 +102,14 @@ protected:
 	GDVIRTUAL0RC(Ref<AudioStreamPlayback>, _instance_playback)
 	GDVIRTUAL0RC(String, _get_stream_name)
 	GDVIRTUAL0RC(float, _get_length)
+	GDVIRTUAL0RC(bool, _is_monophonic)
 
 public:
 	virtual Ref<AudioStreamPlayback> instance_playback();
 	virtual String get_stream_name() const;
 
 	virtual float get_length() const;
+	virtual bool is_monophonic() const;
 };
 
 // Microphone
@@ -129,6 +131,8 @@ public:
 
 	virtual float get_length() const override; //if supported, otherwise return 0
 
+	virtual bool is_monophonic() const override;
+
 	AudioStreamMicrophone();
 };
 
@@ -187,6 +191,7 @@ public:
 	virtual String get_stream_name() const override;
 
 	virtual float get_length() const override; //if supported, otherwise return 0
+	virtual bool is_monophonic() const override;
 
 	AudioStreamRandomPitch();
 };
diff --git a/servers/audio/effects/audio_stream_generator.cpp b/servers/audio/effects/audio_stream_generator.cpp
index edb5c6d2dd..447acf53a4 100644
--- a/servers/audio/effects/audio_stream_generator.cpp
+++ b/servers/audio/effects/audio_stream_generator.cpp
@@ -64,6 +64,10 @@ float AudioStreamGenerator::get_length() const {
 	return 0;
 }
 
+bool AudioStreamGenerator::is_monophonic() const {
+	return true;
+}
+
 void AudioStreamGenerator::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_mix_rate", "hz"), &AudioStreamGenerator::set_mix_rate);
 	ClassDB::bind_method(D_METHOD("get_mix_rate"), &AudioStreamGenerator::get_mix_rate);
diff --git a/servers/audio/effects/audio_stream_generator.h b/servers/audio/effects/audio_stream_generator.h
index 6bec744081..918589f6d0 100644
--- a/servers/audio/effects/audio_stream_generator.h
+++ b/servers/audio/effects/audio_stream_generator.h
@@ -54,6 +54,7 @@ public:
 	virtual String get_stream_name() const override;
 
 	virtual float get_length() const override;
+	virtual bool is_monophonic() const override;
 	AudioStreamGenerator();
 };
 
-- 
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