仅在 MacOS Sierra 上调用 AudioConverterFillComplexBuffer 会导致 CrashIfClientProvidedBogusAudioBufferList

Question

我有一个音频程序，它使用以下代码调用 AudioConverterFillComplexBuffer：

OSStatus error = AudioConverterFillComplexBuffer(recorderObj->audioConverter,
                                                     MyAudioConverterCallback,
                                                     (__bridge void *)playerLocal,
                                                     &ioOutputDataPackets,
                                                     convertedData,
                                                     &streamDesc);

当此代码在 10.6-10.11 上运行时，它工作正常。当代码在 10.12 上运行时，它会崩溃并显示以下消息

Crashed Thread:        16  com.apple.audio.IOThread.client

Exception Type:        EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes:       0x0000000000000001, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Illegal instruction: 4
Termination Reason:    Namespace SIGNAL, Code 0x4
Terminating Process:   exc handler [0]

调用堆栈以 CrashIfClientProvidedBogusAudioBufferList 结束。

大多数文章、文档和邮件列表都会说我有一个糟糕的输出缓冲区，但在我的一生中，我不知道我会做错什么，但我的代码仍然可以在所有版本的 MacOS 上运行，但最新版本。这是我设置缓冲区的方式：

AudioBufferList *convertedData = (AudioBufferList*)malloc(sizeof(AudioBufferList) * 2);

convertedData->mNumberBuffers = 1;
convertedData->mBuffers[0].mNumberChannels =  2;
convertedData->mBuffers[0].mDataByteSize = 64 * 1024;
convertedData->mBuffers[0].mData = (UInt8 *)malloc(sizeof(UInt8) * 64 * 1024);

这是崩溃时的完整堆栈

Thread 16 Crashed:: com.apple.audio.IOThread.client
0   com.apple.audio.toolbox.AudioToolbox    0x00007fff89b9a330 CADebuggerStop() + 4
1   com.apple.audio.toolbox.AudioToolbox    0x00007fff89a21e71 CrashIfClientProvidedBogusAudioBufferList + 97
2   com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2f710 AudioConverterChain::CallInputProc(unsigned int) + 646
3   com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2f386 AudioConverterChain::FillBufferFromInputProc(unsigned int*, CABufferList*) + 130
4   com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2f2ee BufferedAudioConverter::GetInputBytes(unsigned int, unsigned int&, CABufferList const*&) + 178
5   com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2f1b2 CBRConverter::RenderOutput(CABufferList*, unsigned int, unsigned int&, AudioStreamPacketDescription*) + 106
6   com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2225d BufferedAudioConverter::FillBuffer(unsigned int&, AudioBufferList&, AudioStreamPacketDescription*) + 281
7   com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2f2c3 BufferedAudioConverter::GetInputBytes(unsigned int, unsigned int&, CABufferList const*&) + 135
8   com.apple.audio.toolbox.AudioToolbox    0x00007fff89a9369b Resampler2Wrapper::RenderOutput(CABufferList*, unsigned int, unsigned int&) + 183
9   com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2225d BufferedAudioConverter::FillBuffer(unsigned int&, AudioBufferList&, AudioStreamPacketDescription*) + 281
10  com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2f2c3 BufferedAudioConverter::GetInputBytes(unsigned int, unsigned int&, CABufferList const*&) + 135
11  com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2f1b2 CBRConverter::RenderOutput(CABufferList*, unsigned int, unsigned int&, AudioStreamPacketDescription*) + 106
12  com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2225d BufferedAudioConverter::FillBuffer(unsigned int&, AudioBufferList&, AudioStreamPacketDescription*) + 281
13  com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2253f AudioConverterChain::RenderOutput(CABufferList*, unsigned int, unsigned int&, AudioStreamPacketDescription*) + 99
14  com.apple.audio.toolbox.AudioToolbox    0x00007fff89a2225d BufferedAudioConverter::FillBuffer(unsigned int&, AudioBufferList&, AudioStreamPacketDescription*) + 281
15  com.apple.audio.toolbox.AudioToolbox    0x00007fff89a21d2f AudioConverterFillComplexBuffer + 282
16  com.pc-intercom.Intercom        0x0000000107a52803 0x107a4a000 + 34819
17  com.apple.audio.units.Components    0x000000010a38c97c AUHAL::AUIOProc(unsigned int, AudioTimeStamp const*, AudioBufferList const*, AudioTimeStamp const*, AudioBufferList*, AudioTimeStamp const*, void*) + 2324
18  com.apple.audio.CoreAudio       0x00007fff8a71f951 HALC_ProxyIOContext::IOWorkLoop() + 4369
19  com.apple.audio.CoreAudio       0x00007fff8a71e667 HALC_ProxyIOContext::IOThreadEntry(void*) + 131
20  com.apple.audio.CoreAudio       0x00007fff8a71e38b HALB_IOThread::Entry(void*) + 75
21  libsystem_pthread.dylib         0x0000000108134aab _pthread_body + 180
22  libsystem_pthread.dylib         0x00000001081349f7 _pthread_start + 286
23  libsystem_pthread.dylib         0x0000000108134221 thread_start + 13

如果有人对我如何调试此问题有任何建议，我将不胜感激。

Answer 1

在 中MyAudioConverterCallback，ioDataPacketCount应该返回 LPCM 的帧（我猜数据包是未压缩音频的帧），因此将其设置为：

*ioDataPacketCount = recorderObj->inputBuffer->mBuffers[0].mDataByteSize/recorderObj->streamFormat.mBytesPerFrame; 

传递NULL AudioStreamPacketDescription给AudioConverterFillComplexBuffer不是 1 的数组（这导致我在 10.11 上崩溃）。您的目标格式是 LPCM，因此不需要数据包描述，因为您的“数据包”大小都相同。

同样，您的源格式也是LPCM，因此您可以删除返回数据包描述的代码MyAudioConverterCallback- 这也是错误的。

在我的机器上，我得到非交错立体声，这streamFormat意味着MyAudioConverterCallback必须填写ioData->mBuffers[1]。

设置您的 时convertedData AudioBufferList，sizePerPacket使用源格式数据包大小而不是目标数据包大小。它应该是：

sizePerPacket = mOutputFormat.mBytesPerPacket;

最后，即使它没有崩溃，这段代码也不可能是正确的，因为你从麦克风记录（比如说）512 帧，然后要求音频转换器转换 16384 - 这会给你带来音频故障。