Using Marshal.Copy() to fill buffers created by OutputAudioQueue.AllocateBufferWithPacketDescriptors() causes app crash #11183
Description
Steps to Reproduce
It causes occasional crashes in my app. To help the investigation, I created a barebone Xamarin iOS app as simple as possible with the following code to reproduce the crash reliably. Please note this code is for helping debugging only, not the actual code in the app.
OutputAudioQueue audioQueue = new OutputAudioQueue(new AudioStreamBasicDescription()
{
Format = AudioFormatType.MPEG4AAC_HE,
BytesPerPacket = 0,
BitsPerChannel = 0,
Reserved = 0,
FormatFlags = 0,
BytesPerFrame = 0, //Set this field to 0 for compressed formats.
SampleRate = 16000,
ChannelsPerFrame = 1,
FramesPerPacket = 1024 //for AAC.
});
const int BufferCountMax = 1000;
const int AudioBufferSize = 1024 * 8;
for (int i = 0; i < BufferCountMax; i++)
{
AudioQueueStatus aqs = audioQueue.AllocateBufferWithPacketDescriptors(
AudioBufferSize,
1,
out IntPtr ipBuffer
);
if (aqs == AudioQueueStatus.Ok)
{
//_queueAudioOutputBuffers.Enqueue(ipBuffer);
//_qFreeAudioOutputBuffers.Enqueue(ipBuffer);
byte[] abData = new byte[512];
Marshal.Copy(abData, 0, ipBuffer, abData.Length);
}
else
{
Debug.WriteLine("AudioQueueStatus: " + aqs);
}
}
- Build the app.
- Run the app on an iPhone.
- The app crashes.
Expected Behavior
No crash
Actual Behavior
crash
Environment
Microsoft Visual Studio Enterprise 2019
Version 16.9.3
VisualStudio.16.Release/16.9.3+31129.286
Microsoft .NET Framework
Version 4.8.04084
Installed Version: Enterprise
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