在过去的几天里，我一直在用c++制作音频播放器。我遵循了关于msdn的教程，如何使用XAudio2播放音频。我设法制作了正确的代码，但关于msds的教程真的很混乱，也很糟糕。所以我想在这里发布我的代码，这样对每个和我面临同样问题的人来说都会容易得多
#include <xaudio2.h>
#include <iostream>
using namespace std;
#ifdef _XBOX
#define fourccRIFF 'RIFF'
#define fourccDATA 'data'
#define fourccFMT 'fmt '
#define fourccWAVE 'WAVE'
#define fourccXWMA 'XWMA'
#define fourccDPDS 'dpds'
#endif
#ifndef _XBOX
#define fourccRIFF 'FFIR'
#define fourccDATA 'atad'
#define fourccFMT ' tmf'
#define fourccWAVE 'EVAW'
#define fourccXWMA 'AMWX'
#define fourccDPDS 'sdpd'
#endif
HRESULT FindChunk(HANDLE hFile, DWORD fourcc, DWORD& dwChunkSize, DWORD& dwChunkDataPosition)
{
HRESULT hr = S_OK;
if (INVALID_SET_FILE_POINTER == SetFilePointer(hFile, 0, NULL, FILE_BEGIN))
return HRESULT_FROM_WIN32(GetLastError());
DWORD dwChunkType;
DWORD dwChunkDataSize;
DWORD dwRIFFDataSize = 0;
DWORD dwFileType;
DWORD bytesRead = 0;
DWORD dwOffset = 0;
while (hr == S_OK)
{
DWORD dwRead;
if (0 == ReadFile(hFile, &dwChunkType, sizeof(DWORD), &dwRead, NULL))
hr = HRESULT_FROM_WIN32(GetLastError());
if (0 == ReadFile(hFile, &dwChunkDataSize, sizeof(DWORD), &dwRead, NULL))
hr = HRESULT_FROM_WIN32(GetLastError());
switch (dwChunkType)
{
case fourccRIFF:
dwRIFFDataSize = dwChunkDataSize;
dwChunkDataSize = 4;
if (0 == ReadFile(hFile, &dwFileType, sizeof(DWORD), &dwRead, NULL))
hr = HRESULT_FROM_WIN32(GetLastError());
break;
default:
if (INVALID_SET_FILE_POINTER == SetFilePointer(hFile, dwChunkDataSize, NULL, FILE_CURRENT))
return HRESULT_FROM_WIN32(GetLastError());
}
dwOffset += sizeof(DWORD) * 2;
if (dwChunkType == fourcc)
{
dwChunkSize = dwChunkDataSize;
dwChunkDataPosition = dwOffset;
return S_OK;
}
dwOffset += dwChunkDataSize;
if (bytesRead >= dwRIFFDataSize) return S_FALSE;
}
return S_OK;
}
HRESULT ReadChunkData(HANDLE hFile, void* buffer, DWORD buffersize, DWORD bufferoffset)
{
HRESULT hr = S_OK;
if (INVALID_SET_FILE_POINTER == SetFilePointer(hFile, bufferoffset, NULL, FILE_BEGIN))
return HRESULT_FROM_WIN32(GetLastError());
DWORD dwRead;
if (0 == ReadFile(hFile, buffer, buffersize, &dwRead, NULL))
hr = HRESULT_FROM_WIN32(GetLastError());
return hr;
}
int main()
{
HRESULT hr;
hr = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
if (FAILED(hr))
cout << hr;
IXAudio2* pXAudio2 = nullptr;
if (FAILED(hr = XAudio2Create(&pXAudio2, 0, XAUDIO2_DEFAULT_PROCESSOR)))
cout << hr;
IXAudio2MasteringVoice* pMasterVoice = nullptr;
if (FAILED(hr = pXAudio2->CreateMasteringVoice(&pMasterVoice)))
cout << hr;
WAVEFORMATEXTENSIBLE wfx = { 0 };
XAUDIO2_BUFFER buffer = { 0 };
#ifdef _XBOX
char* strFileName = "s.wav";
#else
const TCHAR* strFileName = TEXT("s.wav");
#endif
HANDLE hFile = CreateFile(
strFileName,
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL);
if (INVALID_HANDLE_VALUE == hFile)
cout << HRESULT_FROM_WIN32(GetLastError());
if (INVALID_SET_FILE_POINTER == SetFilePointer(hFile, 0, NULL, FILE_BEGIN))
cout << HRESULT_FROM_WIN32(GetLastError());
DWORD dwChunkSize;
DWORD dwChunkPosition;
//check the file type, should be fourccWAVE or 'XWMA'
FindChunk(hFile, fourccRIFF, dwChunkSize, dwChunkPosition);
DWORD filetype;
ReadChunkData(hFile, &filetype, sizeof(DWORD), dwChunkPosition);
if (filetype != fourccWAVE)
return S_FALSE;
FindChunk(hFile, fourccFMT, dwChunkSize, dwChunkPosition);
ReadChunkData(hFile, &wfx, dwChunkSize, dwChunkPosition);
FindChunk(hFile, fourccDATA, dwChunkSize, dwChunkPosition);
BYTE* pDataBuffer = new BYTE[dwChunkSize];
ReadChunkData(hFile, pDataBuffer, dwChunkSize, dwChunkPosition);
buffer.AudioBytes = dwChunkSize; //size of the audio buffer in bytes
buffer.pAudioData = pDataBuffer; //buffer containing audio data
buffer.Flags = XAUDIO2_END_OF_STREAM; // tell the source voice not to expect any data after this buffer
IXAudio2SourceVoice* pSourceVoice;
if (FAILED(hr = pXAudio2->CreateSourceVoice(&pSourceVoice, (WAVEFORMATEX*)&wfx))) cout << hr;
if (FAILED(hr = pSourceVoice->SubmitSourceBuffer(&buffer)))
cout << hr;
if (FAILED(hr = pSourceVoice->Start(0)))
cout << hr;
cout << "playing" << endl;
cin.get();
}
这是用XAudio2播放音频的代码。PS：它似乎只能播放.wav文件。如果有人知道如何用XAudio2播放.mp3文件，我将非常感谢任何答案。
XAudio2专为PCM和ADPCM数据的实时源速率转换、混合和应用音频效果而设计。XAudio 2.9还支持微软媒体格式的"xWMA"变体，以及Xbox上的硬件辅助格式XMA2。
要播放其他格式，您需要在CPU上解压缩，并使用PCM格式数据将其流式传输到XAudio2语音。有关此示例，请参见XAudio2MFStream。它使用Windows Media Foundation从WMA文件执行这种流式传输。你可以使用一些第三方库来播放MP3、OGG或其他类似的基本功能。
您还可以发现使用DX11和DX12版本中包含的DirectX音频工具包非常有用。