wehub-resource-sync
62 lines
2.0 KiB
Go
62 lines
2.0 KiB
Go
// player/device_darwin.go — macOS Core Audio device sample rate detection.
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//
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// Queries the system's default output audio device for its nominal sample rate.
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// USB audio devices (e.g., USB-C headphones/DACs) commonly operate at 48 kHz,
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// while the built-in speakers default to 44.1 kHz. Using the device's native
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// rate avoids silent playback failures where AudioQueue can't route to a USB
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// device that doesn't support the requested rate.
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//go:build darwin && !ios
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package player
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/*
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#cgo LDFLAGS: -framework CoreAudio
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#include <CoreAudio/CoreAudio.h>
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// defaultOutputSampleRate queries the default output device's nominal sample rate.
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// Returns 0 on any error.
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static double defaultOutputSampleRate() {
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AudioObjectPropertyAddress addr;
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UInt32 size;
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OSStatus status;
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// 1. Get the default output device.
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addr.mSelector = kAudioHardwarePropertyDefaultOutputDevice;
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addr.mScope = kAudioObjectPropertyScopeGlobal;
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addr.mElement = kAudioObjectPropertyElementMain;
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AudioDeviceID deviceID = kAudioObjectUnknown;
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size = sizeof(deviceID);
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status = AudioObjectGetPropertyData(
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kAudioObjectSystemObject, &addr, 0, NULL, &size, &deviceID);
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if (status != noErr || deviceID == kAudioObjectUnknown) {
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return 0;
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}
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// 2. Get the device's nominal sample rate.
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addr.mSelector = kAudioDevicePropertyNominalSampleRate;
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addr.mScope = kAudioObjectPropertyScopeOutput;
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Float64 sampleRate = 0;
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size = sizeof(sampleRate);
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status = AudioObjectGetPropertyData(deviceID, &addr, 0, NULL, &size, &sampleRate);
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if (status != noErr) {
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return 0;
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}
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return sampleRate;
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}
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*/
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import "C"
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// DeviceSampleRate returns the nominal sample rate of the system's default
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// output audio device, or 0 if detection fails. Callers should fall back
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// to a sensible default (e.g. 44100) when 0 is returned.
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func DeviceSampleRate() int {
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rate := C.defaultOutputSampleRate()
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if rate <= 0 {
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return 0
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}
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return int(rate)
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}
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