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iOS: Provide a workaround for discovering sample rates on iOS 18

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There appears to be a bug on iOS 18 which means the session sample
may not update after a call to setPreferredSampleRate
This commit is contained in:
Anthony Nicholls 2025-02-12 11:58:02 +00:00
parent 9bdf69e499
commit 0864d614fd
1 changed files with 60 additions and 0 deletions
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60
modules/juce_audio_devices/native/juce_Audio_ios.cpp
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@ -480,7 +480,67 @@ struct iOSAudioIODevice::Pimpl final : public AsyncUpdater
double trySampleRate (double rate)
{
auto session = [AVAudioSession sharedInstance];
if (exactlyEqual (session.sampleRate, rate))
return rate;
const auto startingSampleRate = session.sampleRate;
setAudioSessionActive (false);
JUCE_NSERROR_CHECK ([session setPreferredSampleRate: rate error: &error]);
setAudioSessionActive (true);
if (! exactlyEqual (startingSampleRate, session.sampleRate))
return session.sampleRate;
AudioStreamBasicDescription stream{};
stream.mFormatID = kAudioFormatLinearPCM;
stream.mSampleRate = rate;
stream.mChannelsPerFrame = 2;
stream.mBitsPerChannel = 32;
stream.mFramesPerPacket = 1;
stream.mBytesPerFrame = stream.mChannelsPerFrame * stream.mBitsPerChannel / 8;
stream.mBytesPerPacket = stream.mBytesPerFrame * stream.mFramesPerPacket;
stream.mFormatFlags = stream.mBitsPerChannel;
stream.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger
| kLinearPCMFormatFlagIsBigEndian
| kLinearPCMFormatFlagIsPacked;
AudioQueueRef audioQueue;
auto err = AudioQueueNewOutput (&stream,
[] (auto, auto, auto) {},
nullptr,
nullptr,
kCFRunLoopCommonModes,
0,
&audioQueue);
if (err != noErr || audioQueue == nullptr)
{
jassertfalse;
return session.sampleRate;
}
const ScopeGuard disposeAudioQueueOnReturn { [&]
{
AudioQueueDispose (audioQueue, true);
}};
Float64 deviceSampleRate{};
UInt32 size = sizeof (deviceSampleRate);
err = AudioQueueGetProperty (audioQueue,
kAudioQueueDeviceProperty_SampleRate,
&deviceSampleRate,
&size);
if (err == noErr && size == sizeof (deviceSampleRate))
return deviceSampleRate;
jassertfalse;
return session.sampleRate;
}