From b294b6e4f9a3dc24bcdce28f0a9c45eda8755f1f Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Tue, 23 May 2023 02:13:08 +0200
Subject: GLMediaPlayer: Add setAudioChannelLimit(..), correlating with
 AudioSink.setChannelLimit() ..

May be utilized to enforce 1 channel (mono) downsampling
in combination with JOAL/OpenAL to experience spatial 3D position effects.
---
 src/jogl/classes/jogamp/opengl/util/av/GLMediaPlayerImpl.java     | 7 +++++++
 .../classes/jogamp/opengl/util/av/impl/FFMPEGMediaPlayer.java     | 8 +++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

(limited to 'src/jogl/classes/jogamp/opengl/util/av')

diff --git a/src/jogl/classes/jogamp/opengl/util/av/GLMediaPlayerImpl.java b/src/jogl/classes/jogamp/opengl/util/av/GLMediaPlayerImpl.java
index 9e390319a..eb4ef5713 100644
--- a/src/jogl/classes/jogamp/opengl/util/av/GLMediaPlayerImpl.java
+++ b/src/jogl/classes/jogamp/opengl/util/av/GLMediaPlayerImpl.java
@@ -96,6 +96,7 @@ public abstract class GLMediaPlayerImpl implements GLMediaPlayer {
     private int textureInternalFormat;
     private int textureType;
     private int texUnit;
+    private int userMaxChannels = -1; // not set
 
     private int textureFragmentShaderHashCode;
 
@@ -247,6 +248,12 @@ public abstract class GLMediaPlayerImpl implements GLMediaPlayer {
     @Override
     public final int[] getTextureWrapST() { return texWrapST; }
 
+    @Override
+    public final void setAudioChannelLimit(final int cc) {
+        userMaxChannels = Math.min(8, Math.max(1, cc));
+    }
+    protected int getAudioChannelLimit() { return userMaxChannels; }
+
     @Override
     public String getRequiredExtensionsShaderStub() {
         if(GLES2.GL_TEXTURE_EXTERNAL_OES == textureTarget) {
diff --git a/src/jogl/classes/jogamp/opengl/util/av/impl/FFMPEGMediaPlayer.java b/src/jogl/classes/jogamp/opengl/util/av/impl/FFMPEGMediaPlayer.java
index d6bbbdc5d..7b86b012d 100644
--- a/src/jogl/classes/jogamp/opengl/util/av/impl/FFMPEGMediaPlayer.java
+++ b/src/jogl/classes/jogamp/opengl/util/av/impl/FFMPEGMediaPlayer.java
@@ -346,6 +346,12 @@ public class FFMPEGMediaPlayer extends GLMediaPlayerImpl {
         } else {
             audioSink = AudioSinkFactory.createDefault(FFMPEGMediaPlayer.class.getClassLoader());
         }
+        {
+            final int audioChannelLimit = getAudioChannelLimit();
+            if( audioChannelLimit >= 1 ) {
+                audioSink.setChannelLimit(audioChannelLimit);
+            }
+        }
         final AudioFormat preferredAudioFormat = audioSink.getPreferredFormat();
         if(DEBUG) {
             System.err.println("initStream: p2 aid "+aid+", preferred "+preferredAudioFormat+" on "+audioSink+", "+this);
@@ -385,7 +391,7 @@ public class FFMPEGMediaPlayer extends GLMediaPlayerImpl {
         } else {
             resStreamLocS = streamLocS;
         }
-        final int aMaxChannelCount = audioSink.getMaxSupportedChannels();
+        final int aMaxChannelCount = preferredAudioFormat.channelCount;
         final int aPrefSampleRate = preferredAudioFormat.sampleRate;
          // setStream(..) issues updateAttributes*(..), and defines avChosenAudioFormat, vid, aid, .. etc
         if(DEBUG) {
-- 
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