[英]Playing audio with XAudio2 c++
在过去的几天里,我在 c++ 中制作音频播放器。 我遵循了 msdn 上的教程,如何使用 XAudio2 播放音频。 我设法编写了正确的代码,但是关于 msds 的教程确实令人困惑和糟糕。 所以我想在这里发布我的代码,这样对每个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();
}
这就是使用 XAudio2 播放音频的代码。 PS:好像只能播放.wav文件。 如果有人知道如何使用 XAudio2 播放.mp3 文件,我将不胜感激。
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 Microsoft 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 上将其解压缩并使用 PCM 格式数据将其解压缩为 XAudio2 语音。 有关这方面的示例,请参阅XAudio2MFStream 。 它使用 Windows Media Foundation 从 WMA 文件执行这种流式传输。 您可以使用一些 3rd 方库来播放 MP3、OGG 或任何做同样基本的事情。
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