diff -ruN /Applications/Xcode_26.0.0-beta2.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/AudioToolbox.framework/Headers/AudioConverter.h /Applications/Xcode_26.0.0-beta3.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/AudioToolbox.framework/Headers/AudioConverter.h--- /Applications/Xcode_26.0.0-beta2.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/AudioToolbox.framework/Headers/AudioConverter.h2025-06-18 05:41:46+++ /Applications/Xcode_26.0.0-beta3.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk/System/Library/Frameworks/AudioToolbox.framework/Headers/AudioConverter.h2025-06-28 10:08:50@@ -190,6 +190,30 @@                     outPropertyData is sizeof(AudioFormatListItem), then only the best format is returned.                     This property may be used for example to discover all the data formats produced by the AAC_HE2                     (AAC High Efficiency vers. 2) encoder.+    @constant   kAudioConverterPropertyPerformDownmix+                    A UInt32 with 1 meaning to perform a mix from input to output channels,+                    and 0 meaning to not perform such a mix.  See kAudioConverterPropertyChannelMixMap+                    for more information on how the mix maps inputs to outputs.+                    Defaults to 0 (no channel mixing).+                    Note #1: Mixing may be performed in any conversion where the number+                    and/or layout of input and output channels are not the same, not only+                    in PCM-to-PCM conversions, and also the number of output channels may+                    be more or less than the number of input channels.+                    Note #2: This property is not compatible with kAudioConverterChannelMap,+                    which is used to map input to output channels without any mixing.+                    The kAudioConverterChannelMap property cannot be set unless+                    kAudioConverterPropertyPerformDownmix is first set to 0.+    @constant   kAudioConverterPropertyChannelMixMap+                    An array of Float32 values, size equal to the product of the numbers of+                    input and output channels.  Each element's value is a gain to apply,+                    from 0.0 to 1.0, to one input when mixing it into one output.+                    The elements are ordered in row-major order, where each row holds the+                    gains to apply for one input to each output.+                    Unless explicitly set, a default mix map is used, based on other+                    properties such as numbers of input and output channels as well as+                    channel layouts, if known.+                    This property should not be set unless and until+                    kAudioConverterPropertyPerformDownmix is first set to 1 (enable channel mixing). */ CF_ENUM(AudioConverterPropertyID) {@@ -223,7 +247,9 @@     kAudioConverterCurrentInputStreamDescription        = 'acid',     kAudioConverterPropertySettings                     = 'acps',     kAudioConverterPropertyBitDepthHint                 = 'acbd',-    kAudioConverterPropertyFormatList                   = 'flst'+    kAudioConverterPropertyFormatList                   = 'flst',+    kAudioConverterPropertyPerformDownmix               = 'dmix',+    kAudioConverterPropertyChannelMixMap                = 'mmap' };  #if !TARGET_OS_IPHONE