From a053315675e6764fe95c671139d796893c2b41a1 Mon Sep 17 00:00:00 2001
From: Denny Sheirer <dennissheirer2002@yahoo.com>
Date: Thu, 19 Feb 2026 03:54:10 -0500
Subject: [PATCH] #2364 Audio Playback supports 64-line alsa mixers as stereo
 output (#2374)

Co-authored-by: denny <dennis.sheirer@gmail.com>
---
 .../AudioPlaybackDeviceDescriptor.java        | 18 ++++-
 .../playback/AudioPlaybackDeviceManager.java  | 69 +++++++++++++++----
 2 files changed, 72 insertions(+), 15 deletions(-)

diff --git a/src/main/java/io/github/dsheirer/audio/playback/AudioPlaybackDeviceDescriptor.java b/src/main/java/io/github/dsheirer/audio/playback/AudioPlaybackDeviceDescriptor.java
index d1f05b7b..31ed6b56 100644
--- a/src/main/java/io/github/dsheirer/audio/playback/AudioPlaybackDeviceDescriptor.java
+++ b/src/main/java/io/github/dsheirer/audio/playback/AudioPlaybackDeviceDescriptor.java
@@ -50,9 +50,25 @@ public class AudioPlaybackDeviceDescriptor implements Comparable<AudioPlaybackDe
                 getChannelDescription(getAudioFormat());
     }
 
+    /**
+     * Cleans the mixer description to reformat/reword certain mixer descriptions
+     * @param mixerInfo containing a description
+     * @return cleaned description
+     */
     private static String getCleanDescription(Mixer.Info mixerInfo)
     {
-        return mixerInfo.getDescription().replace("Direct Audio Device: ", "");
+        if(mixerInfo.getDescription().contains("Direct Audio Device: "))
+        {
+            return mixerInfo.getDescription().replace("Direct Audio Device: ", "");
+        }
+        else if(mixerInfo.getDescription().contains("alsa_playback.java"))
+        {
+            return "Default (Java/ALSA)";
+        }
+        else
+        {
+            return mixerInfo.getDescription();
+        }
     }
 
     /**
diff --git a/src/main/java/io/github/dsheirer/audio/playback/AudioPlaybackDeviceManager.java b/src/main/java/io/github/dsheirer/audio/playback/AudioPlaybackDeviceManager.java
index 992c491c..8fefe96c 100644
--- a/src/main/java/io/github/dsheirer/audio/playback/AudioPlaybackDeviceManager.java
+++ b/src/main/java/io/github/dsheirer/audio/playback/AudioPlaybackDeviceManager.java
@@ -88,25 +88,66 @@ public class AudioPlaybackDeviceManager
                     {
                         for(AudioFormat audioFormat : dataLineInfo.getFormats())
                         {
-                            if(!audioFormat.isBigEndian() &&
-                                audioFormat.getSampleSizeInBits() == 16 &&
-                               !discoveredFormats.contains(audioFormat) &&
-                                audioFormat.getChannels() <= 2) //TODO: remove the 2 channels max restriction once supported
+                            if(!audioFormat.isBigEndian() && audioFormat.getSampleSizeInBits() == 16 &&
+                               !discoveredFormats.contains(audioFormat))
                             {
-                                if(audioFormat.getSampleRate() == AudioSystem.NOT_SPECIFIED)
+                                if(audioFormat.getChannels() == 1)
                                 {
-                                    discoveredFormats.add(audioFormat);
-                                    //Modify the format for 8 kHz sample rate
-                                    AudioFormat updatedFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
-                                8000, 16, audioFormat.getChannels(), audioFormat.getFrameSize(),
-                                            8000, false);
-                                    devices.add(new AudioPlaybackDeviceDescriptor(mixerInfo, updatedFormat));
+                                    if(audioFormat.getSampleRate() == AudioSystem.NOT_SPECIFIED)
+                                    {
+                                        discoveredFormats.add(audioFormat);
+                                        //Modify the format for 8 kHz sample rate
+                                        AudioFormat updatedFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
+                                                8000, 16, audioFormat.getChannels(), audioFormat.getFrameSize(),
+                                                8000, false);
+                                        devices.add(new AudioPlaybackDeviceDescriptor(mixerInfo, updatedFormat));
+                                    }
+                                    else if(audioFormat.getSampleRate() == 8000)
+                                    {
+                                        discoveredFormats.add(audioFormat);
+                                        devices.add(new AudioPlaybackDeviceDescriptor(mixerInfo, audioFormat));
+                                    }
                                 }
-                                else if(audioFormat.getSampleRate() == 8000)
+                                //Stereo and 64-channel formats
+                                else if(audioFormat.getChannels() == 2 || audioFormat.getChannels() > 8)
                                 {
-                                    discoveredFormats.add(audioFormat);
-                                    devices.add(new AudioPlaybackDeviceDescriptor(mixerInfo, audioFormat));
+                                    if(audioFormat.getSampleRate() == AudioSystem.NOT_SPECIFIED)
+                                    {
+                                        discoveredFormats.add(audioFormat);
+                                        //Modify the format for 8 kHz sample rate, 2 channels, 4 bytes per frame
+                                        AudioFormat updatedFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
+                                                8000, 16, 2, 4,
+                                                8000, false);
+                                        devices.add(new AudioPlaybackDeviceDescriptor(mixerInfo, updatedFormat));
+                                    }
+                                    else if(audioFormat.getSampleRate() == 8000)
+                                    {
+                                        discoveredFormats.add(audioFormat);
+                                        //Modify the format for 8 kHz sample rate, 2 channels, 4 bytes per frame
+                                        AudioFormat updatedFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
+                                                audioFormat.getSampleRate(), 16, 2, 4,
+                                                audioFormat.getFrameRate(), false);
+                                        devices.add(new AudioPlaybackDeviceDescriptor(mixerInfo, updatedFormat));
+                                    }
                                 }
+                                //TODO: remove the 2 channels max restriction once supported
+//                                else if(audioFormat.getChannels() > 2 && audioFormat.getChannels() <= 8)
+//                                {
+//                                    if(audioFormat.getSampleRate() == AudioSystem.NOT_SPECIFIED)
+//                                    {
+//                                        discoveredFormats.add(audioFormat);
+//                                        //Modify the format for 8 kHz sample rate
+//                                        AudioFormat updatedFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
+//                                                8000, 16, audioFormat.getChannels(), audioFormat.getFrameSize(),
+//                                                8000, false);
+//                                        devices.add(new AudioPlaybackDeviceDescriptor(mixerInfo, updatedFormat));
+//                                    }
+//                                    else if(audioFormat.getSampleRate() == 8000)
+//                                    {
+//                                        discoveredFormats.add(audioFormat);
+//                                        devices.add(new AudioPlaybackDeviceDescriptor(mixerInfo, audioFormat));
+//                                    }
+//                                }
                             }
                         }
                     }