关于生成DIVX/MP3编码的ASF格式文件

最近在开发一个视频系统, 涉及要保存为asf格式的文件, 写出以下代码

HRESULT CStreamWriter::CreateStreamMP3(WORD nStreamNum,

int nSamplesPerSec,

int nBitRate)

{

const GUID WMMEDIATYPE_SubType_MP3 = WMMEDIASUBTYPE_MP3;

const DWORD dwBufferWindow = 1000; // default=100ms -1 = unknown

WCHAR * wcStreamName = L"MP3 Stream";

WCHAR * wcConnectionName = L"MP3 Connection";

IWMStreamConfig *pStreamConfig;

IWMMediaProps *pMediaProps;

WM_MEDIA_TYPE mt;

WAVEFORMATEX *wavx;

HRESULT hr;

hr = m_pProfile->CreateNewStream(WMMEDIATYPE_Audio, &pStreamConfig);

hr = pStreamConfig->SetStreamNumber(nStreamNum);

hr = pStreamConfig->SetStreamName(wcStreamName);

hr = pStreamConfig->SetConnectionName(wcConnectionName);

hr = pStreamConfig->SetBufferWindow(dwBufferWindow);

hr = pStreamConfig->SetBitrate(nBitRate);

// Programmatically set the audio codec and attributes to "MPEG Layer-3, 11kHz, 16kBits/sec, mono".

// The values for this audio codec and attributes were determined by investigating the audio codec

wavx = (LPWAVEFORMATEX) new BYTE[sizeof(WAVEFORMATEX) + 12];

wavx->wFormatTag = 85;

wavx->nChannels = 1;

wavx->nSamplesPerSec = nSamplesPerSec;

// average bytes/sec the MP3 audio codec claims for "16kHz, 16kBits/sec, mono"

wavx->nAvgBytesPerSec = nBitRate / 8;

wavx->nBlockAlign = 1;

wavx->wBitsPerSample = 0;

// The Windows MPEG Layer-3 audio codec has 12 bytes of extra data.

// In a Win32 WAVEFORMATEX structure, this data is appended after the cbSize field.

wavx->cbSize = 12;

// MPEG Layer-3 audio codec extra data (in hexidecimal) for "11kHz, 16kBits/sec, mono"

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 0] = 0x01;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 1] = 0x00;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 2] = 0x02;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 3] = 0x00;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 4] = 0x00;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 5] = 0x00;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 6] = 0x68;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 7] = 0x00;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 8] = 0x01;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 9] = 0x00;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 10] = 0x71;

((BYTE *)wavx)[sizeof(WAVEFORMATEX)+ 11] = 0x05;

ZeroMemory(&mt, sizeof(mt));

mt.majortype = WMMEDIATYPE_Audio;

mt.subtype = WMMEDIATYPE_SubType_MP3;

mt.bFixedSizeSamples = TRUE;

mt.bTemporalCompression = FALSE;

mt.lSampleSize = 1;

mt.formattype = WMFORMAT_WaveFormatEx;

mt.pUnk = NULL;

mt.cbFormat = sizeof(WAVEFORMATEX) + 12;

mt.pbFormat = (BYTE*)wavx;

hr = pStreamConfig->QueryInterface( IID_IWMMediaProps, (void**)&pMediaProps );

hr = pMediaProps->SetMediaType( &mt );

hr = m_pProfile->AddStream(pStreamConfig);

delete []wavx;

pStreamConfig->Release();

pMediaProps->Release();

return hr;

}

HRESULT CStreamWriter::CreateStreamDIVX(WORD nStreamNum,

int nWidth,

int nHeight,

int nBitRate,

int nFramePerSecond,

int nBitColor)

{

const GUID WMMEDIATYPE_SubType_DivX =

{0x58564944, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xAA, 0x00, 0x38, 0x9B, 0x71};

const DWORD dwHandler = MAKEFOURCC('D','I','V','X');

const DWORD dwBufferWindow = 3000; // default=3000ms -1 = unknown

WCHAR * wcStreamName = L"DIVX Stream";

WCHAR * wcConnectionName = L"DIVX Connection";

IWMStreamConfig *pStreamConfig;

IWMMediaProps *pMediaProps;

WM_MEDIA_TYPE mt;

WMVIDEOINFOHEADER videoInfo;

HRESULT hr;

hr = m_pProfile->CreateNewStream(WMMEDIATYPE_Video, &pStreamConfig);

hr = pStreamConfig->SetStreamNumber(nStreamNum);

hr = pStreamConfig->SetStreamName(wcStreamName);

hr = pStreamConfig->SetConnectionName(wcConnectionName);

hr = pStreamConfig->SetBufferWindow(dwBufferWindow);

hr = pStreamConfig->SetBitrate(nBitRate);

ZeroMemory(&videoInfo, sizeof(videoInfo));

videoInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

videoInfo.bmiHeader.biCompression = dwHandler;

videoInfo.bmiHeader.biBitCount = nBitColor;

videoInfo.bmiHeader.biWidth = nWidth;

videoInfo.bmiHeader.biHeight = nHeight;

videoInfo.bmiHeader.biPlanes = 1;

videoInfo.bmiHeader.biSizeImage = 0;

videoInfo.bmiHeader.biClrImportant = 0;

videoInfo.rcSource.left = 0;

videoInfo.rcSource.top = 0;

videoInfo.rcSource.right = videoInfo.bmiHeader.biWidth;

videoInfo.rcSource.bottom = videoInfo.bmiHeader.biHeight;

videoInfo.rcTarget = videoInfo.rcSource;

videoInfo.dwBitRate = nBitRate;

videoInfo.dwBitErrorRate = 0;

videoInfo.AvgTimePerFrame = 10000000 / nFramePerSecond;

ZeroMemory(&mt, sizeof(mt));

mt.majortype = WMMEDIATYPE_Video;

mt.subtype = WMMEDIATYPE_SubType_DivX;

mt.bFixedSizeSamples = FALSE;

mt.bTemporalCompression = TRUE;

mt.lSampleSize = 0;

mt.formattype = WMFORMAT_VideoInfo;

mt.pUnk = NULL;

mt.cbFormat = sizeof(WMVIDEOINFOHEADER);

mt.pbFormat = (BYTE*)&videoInfo;

hr = pStreamConfig->QueryInterface( IID_IWMMediaProps, (void**)&pMediaProps );

hr = pMediaProps->SetMediaType( &mt );

hr = m_pProfile->AddStream(pStreamConfig);

pStreamConfig->Release();

pMediaProps->Release();

return hr;

}

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