Xaudio2在更改缓冲区或循环时弹出声音

Xaudio2 pop sound when changing buffer or looping

本文关键字：声音 循环 缓冲区 Xaudio2      更新时间：2023-10-16

我有一个简单的程序，可以播放正弦波
在缓冲区的尽头，我听到一声爆裂声
如果我尝试循环，我会在每个循环之间听到爆裂声
如果我在缓冲区之间交替，我会听到爆裂声。

struct win32_audio_buffer
{
XAUDIO2_BUFFER XAudioBuffer = {};
int16 *Memory;
};
struct win32_audio_setteings
{
int32 SampleRate = 44100;
int32 ToneHz = 200;
int32 Channels = 2;
int32 LoopTime = 10;
int32 TotalSamples = SampleRate * LoopTime;
};
win32_audio_setteings AudioSetteings;
win32_audio_buffer MainAudioBuffer;
win32_audio_buffer SecondaryAudioBuffer;
IXAudio2SourceVoice* pSourceVoice;
internal void Win32InitXaudio2()
{
WAVEFORMATEX WaveFormat = {};
WaveFormat.wFormatTag = WAVE_FORMAT_PCM;
WaveFormat.nChannels = AudioSetteings.Channels;
WaveFormat.nSamplesPerSec = AudioSetteings.SampleRate;
WaveFormat.wBitsPerSample = 16;
WaveFormat.nBlockAlign = (WaveFormat.nChannels * WaveFormat.wBitsPerSample) / 8;
WaveFormat.nAvgBytesPerSec = WaveFormat.nSamplesPerSec * WaveFormat.nBlockAlign;
WaveFormat.cbSize = 0;

IXAudio2* pXAudio2;
IXAudio2MasteringVoice* pMasterVoice;

XAudio2Create(&pXAudio2);
pXAudio2->CreateMasteringVoice(&pMasterVoice);

pXAudio2->CreateSourceVoice(&pSourceVoice, &WaveFormat);
}
//DOC: AudioBytes - Size of the audio data
//DOC: pAudioData - The buffer start loaction (Needs to be type cast into BYTE pointer)
internal void Win32CreateAudioBuffer(win32_audio_buffer *AudioBuffer)
{
int32 Size = (int16)sizeof(int16) * AudioSetteings.Channels * AudioSetteings.SampleRate * AudioSetteings.LoopTime;

AudioBuffer->Memory = (int16 *)VirtualAlloc(0, Size, MEM_COMMIT|MEM_RESERVE, PAGE_READWRITE);

AudioBuffer->XAudioBuffer.AudioBytes = Size;   
AudioBuffer->XAudioBuffer.pAudioData = (BYTE *) AudioBuffer->Memory;  
//AudioBuffer->XAudioBuffer.Flags = XAUDIO2_END_OF_STREAM;
AudioBuffer->XAudioBuffer.PlayBegin = 0;
AudioBuffer->XAudioBuffer.PlayLength = AudioSetteings.TotalSamples;
//AudioBuffer->XAudioBuffer.LoopCount = 10;

}
internal void Win32Playback(win32_audio_buffer *AudioBuffer)
{
for (int32 Index = 0, Sample = 0; Sample < AudioSetteings.TotalSamples; Sample++)
{
real32 Sine = sinf(Sample * 2.0f * Pi32 / AudioSetteings.ToneHz);
int16 value = (int16)(4000 * Sine);
AudioBuffer->Memory[Index++] = value;
AudioBuffer->Memory[Index++] = value;
}
pSourceVoice->SubmitSourceBuffer(&AudioBuffer->XAudioBuffer);
}
Win32InitXaudio2();
Win32CreateAudioBuffer(&MainAudioBuffer);
//Win32CreateAudioBuffer(&SecondaryAudioBuffer);
Win32Playback(&MainAudioBuffer);
//Win32Playback(&SecondaryAudioBuffer);
pSourceVoice->Start(0);

我已经在这里发布了相关的代码，它只播放一个正弦缓冲区
我尝试了altrantaing缓冲区，并在过零点开始和结束。

我也遇到了类似的问题。

也许这会对某人有所帮助。

问题在于为音频分配的内存超出了需要。

所以我尝试了这样的方法，发现了问题(这不是解决方案，我只是展示了我是如何发现问题的！可能，如果它对你的情况没有帮助，那么问题就在其他地方(

// XAUDIO2_BUFFER m_xaudio2Buffer...
m_xaudio2Buffer.pAudioData = source->m_data;
m_xaudio2Buffer.AudioBytes = source->m_dataSize - 100; // -100 and `pop` sound is gone
m_xaudio2Buffer.Flags = XAUDIO2_END_OF_STREAM;
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