Media Foundation学习笔记（三）Media Foundation的架构 基本对象类型
基本对象类型
Attributes
一个Attribute就是一个“键”-“值”对，其中“键”是一个GUID，“值”是一个PROPVARIANT。在Media Foundation中，Attributes被广泛地用于配置对象、描述媒体格式、查询对象属性和其他目的。
“值”只能是这7种类型：UINT32、UINT64、64-bits浮点数、GUID、null结尾的宽字符串、字节数组和IUnknown指针，被定义在MF_ATTRIBUTE_TYPE中：
typedefenum _MF_ATTRIBUTE_TYPE {
MF_ATTRIBUTE_UINT32 = VT_UI4,
MF_ATTRIBUTE_UINT64 = VT_UI8,
MF_ATTRIBUTE_DOUBLE = VT_R8,
MF_ATTRIBUTE_GUID = VT_CLSID,
MF_ATTRIBUTE_STRING = VT_LPWSTR,
MF_ATTRIBUTE_BLOB = VT_VECTOR | VT_UI1,
MF_ATTRIBUTE_IUNKNOWN = VT_UNKNOWN
} MF_ATTRIBUTE_TYPE;
IMFAttributes接口:设置和获取Attribute。例如：IMFAttributes::SetUINT32。
MFCreateAttributes:创建一个空的Attribute。
创建、设置和读取Attribute的例子：
externconst GUID MY_ATTRIBUTE;
HRESULT ShowCreateAttributeStore(IMFAttributes **ppAttributes)
{
IMFAttributes *pAttributes = NULL;
const UINT32 cElements = 10; // Starting size.
// Create the empty attribute store.
HRESULT hr = MFCreateAttributes(&pAttributes, cElements);
// Set the MY_ATTRIBUTE attribute with a string value.
if (SUCCEEDED(hr))
{
hr = pAttributes->SetString(
MY_ATTRIBUTE,
L"This is a string value"
);
}
// Return the IMFAttributes pointer to the caller.
if (SUCCEEDED(hr))
{
*ppAttributes = pAttributes;
(*ppAttributes)->AddRef();
}
SAFE_RELEASE(pAttributes);
return hr;
}
HRESULT ShowGetAttributes()
{
IMFAttributes *pAttributes = NULL;
WCHAR *pwszValue = NULL;
UINT32 cchLength = 0;
// Create the attribute store.
HRESULT hr = ShowCreateAttributeStore(&pAttributes);
// Get the attribute.
if (SUCCEEDED(hr))
{
hr = pAttributes->GetAllocatedString(
MY_ATTRIBUTE,
&pwszValue,
&cchLength
);
}
CoTaskMemFree(pwszValue);
SAFE_RELEASE(pAttributes);
return hr;
}
序列化Attribute：
序列化为字节数组：使用MFGetAttributesAsBlob和MFInitAttributesFromBlob；
序列化到一个实现了Istream接口的stream对象：使用MFSerializeAttributesToStream和MFDeserializeAttributesFromStream。
Media Types
Media Type描述了媒体流的格式。类似DShow中的AM_MEDIA_TYPE。
接口：IMFMediaType。这个接口从IMFAttributes继承而来。
MFCreateMediaType：创建一个新的MediaType。新的MediaType没有任何Attributes。
Media Type一些通用Attributes：
1.“键”MF_MT_MAJOR_TYPE：类似Dshow的AM_MEDIA_TYPE结构体中的majortype成员；“值”MFMediaType_Video：类似Dshow的MEDIATYPE_Video；
2. “键”MF_MT_SUBTYPE：类似Dshow的AM_MEDIA_TYPE结构体中的subtype成员；“值”MFVideoFormat_RGB24：类似Dshow的MEDIASUBTYPE_H264。
Dshow中的媒体类型结构体和Media Foundation中的Media Type的转换：
AM_MEDIA_TYPE转MediaType互:MFInitMediaTypeFromAMMediaType；
BITMAPINFOHEADER转Media Type：MFCreateVideoMediaTypeFromBitMapInfoHeaderEx；
VIDEOINFOHEADER转Media Type：MFInitMediaTypeFromVideoInfoHeader；
VIDEOINFOHEADER2转Media Type：MFInitMediaTypeFromVideoInfoHeader2；
WAVEFORMATEX或WAVEFORMATEXTENSIBLE转Media Type：MFInitMediaTypeFromWaveFormatEx。
MediaType转AM_MEDIA_TYPE：IMFMediaType::GetRepresentation或MFCreateAMMediaTypeFromMFMediaType或MFInitAMMediaTypeFromMFMediaType；
MediaType转VIDEOINFOHEADER或VIDEOINFOHEADER2：IMFMediaType::GetRepresentation；
MediaType转WAVEFORMATEX或WAVEFORMATEXTENSIBLE：MFCreateWaveFormatExFromMFMediaType。
Dshow中的媒体类型结构体成员和Media Foundation中的Attributes的对应关系：
AM_MEDIA_TYPE结构体：
| Member |
Attribute |
| bTemporalCompression |
MF_MT_ALL_SAMPLES_INDEPENDENT |
| bFixedSizeSamples |
MF_MT_FIXED_SIZE_SAMPLES |
| lSampleSize |
MF_MT_SAMPLE_SIZE |
WAVEFORMATEX, WAVEFORMATEXTENSIBLE结构体：
| Member |
Attribute |
| wFormatTag |
MF_MT_SUBTYPE If wFormatTag is WAVE_FORMAT_EXTENSIBLE, the subtype is found in the SubFormat member. |
| nChannels |
MF_MT_AUDIO_NUM_CHANNELS |
| nSamplesPerSec |
MF_MT_AUDIO_SAMPLES_PER_SECOND |
| nAvgBytesPerSec |
MF_MT_AUDIO_AVG_BYTES_PER_SECOND |
| nBlockAlign |
MF_MT_AUDIO_BLOCK_ALIGNMENT |
| wBitsPerSample |
MF_MT_AUDIO_BITS_PER_SAMPLE |
| wValidBitsPerSample |
MF_MT_AUDIO_VALID_BITS_PER_SAMPLE |
| wSamplesPerBlock |
MF_MT_AUDIO_SAMPLES_PER_BLOCK |
| dwChannelMask |
MF_MT_AUDIO_CHANNEL_MASK |
| SubFormat |
MF_MT_SUBTYPE |
| Extra data |
MF_MT_USER_DATA |
VIDEOINFOHEADER, VIDEOINFOHEADER2结构体：
| Member |
Attribute |
| dwBitRate |
MF_MT_AVG_BITRATE |
| dwBitErrorRate |
MF_MT_AVG_BIT_ERROR_RATE |
| AvgTimePerFrame |
MF_MT_FRAME_RATE; useMFAverageTimePerFrameToFrameRate to calculate this value. |
| dwInterlaceFlags |
MF_MT_INTERLACE_MODE |
| dwCopyProtectFlags |
No defined equivalent |
| dwPictAspectRatioX, dwPictAspectRatioY |
MF_MT_PIXEL_ASPECT_RATIO; must convert from picture aspect ratio to picture aspect ratio. |
| dwControlFlags |
MF_MT_PAD_CONTROL_FLAGS. If the AMCONTROL_COLORINFO_PRESENT flag is present, set the extended color attributes described in Extended Color Information. |
| bmiHeader.biWidth, bmiHeader.biHeight |
MF_MT_FRAME_SIZE |
| bmiHeader.biBitCount |
Implicit in the subtype (MF_MT_SUBTYPE). |
| bmiHeader.biCompression |
Implicit in the subtype. |
| bmiHeader.biSizeImage |
MF_MT_SAMPLE_SIZE |
| Palette information |
MF_MT_PALETTE |
The following attributes can be inferred from theVIDEOINFOHEADER orVIDEOINFOHEADER2 structure but also require some knowledge of the format details. For example, different YUV formats have different stride requirements.
MF_MT_DEFAULT_STRIDE
MF_MT_MINIMUM_DISPLAY_APERTURE
MF_MT_PAN_SCAN_APERTURE
一些有用的针对Media Type对象的函数：
|
|
|
| MFAverageTimePerFrameToFrameRate |
Calculates the frame rate from the average duration of a video frame. |
| MFCalculateImageSize |
Retrieves the image size for an uncompressed video format. |
| MFCompareFullToPartialMediaType |
Compares a full media type to a partial media type. |
| MFCreateMediaType |
Creates an empty media type. |
| MFFrameRateToAverageTimePerFrame |
Converts a video frame rate into a frame duration. |
| MFGetStrideForBitmapInfoHeader |
Retrieves the minimum surface stride for a video format. |
| MFIsFormatYUV |
Queries whether a FOURCC code or D3DFORMAT value is a YUV format. |
| MFValidateMediaTypeSize |
Validates the size of a buffer for a video format block. |
| MFWrapMediaType |
Creates a media type that wraps another media type. |
调试打印Media Type对象的函数：
#include
LPCWSTR GetGUIDNameConst(const GUID& guid);
HRESULT GetGUIDName(const GUID& guid, WCHAR **ppwsz);
HRESULT LogAttributeValueByIndex(IMFAttributes *pAttr, DWORD index);
HRESULT SpecialCaseAttributeValue(GUID guid, const PROPVARIANT& var);
void DBGMSG(PCWSTR format, ...);
HRESULT LogMediaType(IMFMediaType *pType)
{
UINT32 count = 0;
HRESULT hr = pType->GetCount(&count);
if (FAILED(hr))
{
return hr;
}
if (count == 0)
{
DBGMSG(L"Empty media type.\n");
}
for (UINT32 i = 0; i < count; i++)
{
hr = LogAttributeValueByIndex(pType, i);
if (FAILED(hr))
{
break;
}
}
return hr;
}
HRESULT LogAttributeValueByIndex(IMFAttributes *pAttr, DWORD index)
{
WCHAR *pGuidName = NULL;
WCHAR *pGuidValName = NULL;
GUID guid = { 0 };
PROPVARIANT var;
PropVariantInit(&var);
HRESULT hr = pAttr->GetItemByIndex(index, &guid, &var);
if (FAILED(hr))
{
goto done;
}
hr = GetGUIDName(guid, &pGuidName);
if (FAILED(hr))
{
goto done;
}
DBGMSG(L"\t%s\t", pGuidName);
hr = SpecialCaseAttributeValue(guid, var);
if (FAILED(hr))
{
goto done;
}
if (hr == S_FALSE)
{
switch (var.vt)
{
case VT_UI4:
DBGMSG(L"%d", var.ulVal);
break;
case VT_UI8:
DBGMSG(L"%I64d", var.uhVal);
break;
case VT_R8:
DBGMSG(L"%f", var.dblVal);
break;
case VT_CLSID:
hr = GetGUIDName(*var.puuid, &pGuidValName);
if (SUCCEEDED(hr))
{
DBGMSG(pGuidValName);
}
break;
case VT_LPWSTR:
DBGMSG(var.pwszVal);
break;
case VT_VECTOR | VT_UI1:
DBGMSG(L"<>");
break;
case VT_UNKNOWN:
DBGMSG(L"IUnknown");
break;
default:
DBGMSG(L"Unexpected attribute type (vt = %d)", var.vt);
break;
}
}
done:
DBGMSG(L"\n");
CoTaskMemFree(pGuidName);
CoTaskMemFree(pGuidValName);
PropVariantClear(&var);
return hr;
}
HRESULT GetGUIDName(const GUID& guid, WCHAR **ppwsz)
{
HRESULT hr = S_OK;
WCHAR *pName = NULL;
LPCWSTR pcwsz = GetGUIDNameConst(guid);
if (pcwsz)
{
size_t cchLength = 0;
hr = StringCchLength(pcwsz, STRSAFE_MAX_CCH, &cchLength);
if (FAILED(hr))
{
goto done;
}
pName = (WCHAR*)CoTaskMemAlloc((cchLength + 1) * sizeof(WCHAR));
if (pName == NULL)
{
hr = E_OUTOFMEMORY;
goto done;
}
hr = StringCchCopy(pName, cchLength + 1, pcwsz);
if (FAILED(hr))
{
goto done;
}
}
else
{
hr = StringFromCLSID(guid, &pName);
}
done:
if (FAILED(hr))
{
*ppwsz = NULL;
CoTaskMemFree(pName);
}
else
{
*ppwsz = pName;
}
return hr;
}
void LogUINT32AsUINT64(const PROPVARIANT& var)
{
UINT32 uHigh = 0, uLow = 0;
Unpack2UINT32AsUINT64(var.uhVal.QuadPart, &uHigh, &uLow);
DBGMSG(L"%d x %d", uHigh, uLow);
}
float OffsetToFloat(const MFOffset& offset)
{
return offset.value + (static_cast(offset.fract) / 65536.0f);
}
HRESULT LogVideoArea(const PROPVARIANT& var)
{
if (var.caub.cElems OffsetX), OffsetToFloat(pArea->OffsetY),
pArea->Area.cx, pArea->Area.cy);
return S_OK;
}
// Handle certain known special cases.
HRESULT SpecialCaseAttributeValue(GUID guid, const PROPVARIANT& var)
{
if ((guid == MF_MT_FRAME_RATE) || (guid == MF_MT_FRAME_RATE_RANGE_MAX) ||
(guid == MF_MT_FRAME_RATE_RANGE_MIN) || (guid == MF_MT_FRAME_SIZE) ||
(guid == MF_MT_PIXEL_ASPECT_RATIO))
{
// Attributes that contain two packed 32-bit values.
LogUINT32AsUINT64(var);
}
elseif ((guid == MF_MT_GEOMETRIC_APERTURE) ||
(guid == MF_MT_MINIMUM_DISPLAY_APERTURE) ||
(guid == MF_MT_PAN_SCAN_APERTURE))
{
// Attributes that an MFVideoArea structure.
return LogVideoArea(var);
}
else
{
return S_FALSE;
}
return S_OK;
}
void DBGMSG(PCWSTR format, ...)
{
va_list args;
va_start(args, format);
WCHAR msg[MAX_PATH];
if (SUCCEEDED(StringCbVPrintf(msg, sizeof(msg), format, args)))
{
OutputDebugString(msg);
}
}
#ifndef IF_EQUAL_RETURN
#define IF_EQUAL_RETURN(param, val) if(val == param) return L#val
#endif
LPCWSTR GetGUIDNameConst(const GUID& guid)
{
IF_EQUAL_RETURN(guid, MF_MT_MAJOR_TYPE);
IF_EQUAL_RETURN(guid, MF_MT_MAJOR_TYPE);
IF_EQUAL_RETURN(guid, MF_MT_SUBTYPE);
IF_EQUAL_RETURN(guid, MF_MT_ALL_SAMPLES_INDEPENDENT);
IF_EQUAL_RETURN(guid, MF_MT_FIXED_SIZE_SAMPLES);
IF_EQUAL_RETURN(guid, MF_MT_COMPRESSED);
IF_EQUAL_RETURN(guid, MF_MT_SAMPLE_SIZE);
IF_EQUAL_RETURN(guid, MF_MT_WRAPPED_TYPE);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_NUM_CHANNELS);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_SAMPLES_PER_SECOND);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_FLOAT_SAMPLES_PER_SECOND);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_AVG_BYTES_PER_SECOND);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_BLOCK_ALIGNMENT);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_BITS_PER_SAMPLE);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_VALID_BITS_PER_SAMPLE);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_SAMPLES_PER_BLOCK);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_CHANNEL_MASK);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_FOLDDOWN_MATRIX);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_WMADRC_PEAKREF);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_WMADRC_PEAKTARGET);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_WMADRC_AVGREF);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_WMADRC_AVGTARGET);
IF_EQUAL_RETURN(guid, MF_MT_AUDIO_PREFER_WAVEFORMATEX);
IF_EQUAL_RETURN(guid, MF_MT_AAC_PAYLOAD_TYPE);
IF_EQUAL_RETURN(guid, MF_MT_AAC_AUDIO_PROFILE_LEVEL_INDICATION);
IF_EQUAL_RETURN(guid, MF_MT_FRAME_SIZE);
IF_EQUAL_RETURN(guid, MF_MT_FRAME_RATE);
IF_EQUAL_RETURN(guid, MF_MT_FRAME_RATE_RANGE_MAX);
IF_EQUAL_RETURN(guid, MF_MT_FRAME_RATE_RANGE_MIN);
IF_EQUAL_RETURN(guid, MF_MT_PIXEL_ASPECT_RATIO);
IF_EQUAL_RETURN(guid, MF_MT_DRM_FLAGS);
IF_EQUAL_RETURN(guid, MF_MT_PAD_CONTROL_FLAGS);
IF_EQUAL_RETURN(guid, MF_MT_SOURCE_CONTENT_HINT);
IF_EQUAL_RETURN(guid, MF_MT_VIDEO_CHROMA_SITING);
IF_EQUAL_RETURN(guid, MF_MT_INTERLACE_MODE);
IF_EQUAL_RETURN(guid, MF_MT_TRANSFER_FUNCTION);
IF_EQUAL_RETURN(guid, MF_MT_VIDEO_PRIMARIES);
IF_EQUAL_RETURN(guid, MF_MT_CUSTOM_VIDEO_PRIMARIES);
IF_EQUAL_RETURN(guid, MF_MT_YUV_MATRIX);
IF_EQUAL_RETURN(guid, MF_MT_VIDEO_LIGHTING);
IF_EQUAL_RETURN(guid, MF_MT_VIDEO_NOMINAL_RANGE);
IF_EQUAL_RETURN(guid, MF_MT_GEOMETRIC_APERTURE);
IF_EQUAL_RETURN(guid, MF_MT_MINIMUM_DISPLAY_APERTURE);
IF_EQUAL_RETURN(guid, MF_MT_PAN_SCAN_APERTURE);
IF_EQUAL_RETURN(guid, MF_MT_PAN_SCAN_ENABLED);
IF_EQUAL_RETURN(guid, MF_MT_AVG_BITRATE);
IF_EQUAL_RETURN(guid, MF_MT_AVG_BIT_ERROR_RATE);
IF_EQUAL_RETURN(guid, MF_MT_MAX_KEYFRAME_SPACING);
IF_EQUAL_RETURN(guid, MF_MT_DEFAULT_STRIDE);
IF_EQUAL_RETURN(guid, MF_MT_PALETTE);
IF_EQUAL_RETURN(guid, MF_MT_USER_DATA);
IF_EQUAL_RETURN(guid, MF_MT_AM_FORMAT_TYPE);
IF_EQUAL_RETURN(guid, MF_MT_MPEG_START_TIME_CODE);
IF_EQUAL_RETURN(guid, MF_MT_MPEG2_PROFILE);
IF_EQUAL_RETURN(guid, MF_MT_MPEG2_LEVEL);
IF_EQUAL_RETURN(guid, MF_MT_MPEG2_FLAGS);
IF_EQUAL_RETURN(guid, MF_MT_MPEG_SEQUENCE_HEADER);
IF_EQUAL_RETURN(guid, MF_MT_DV_AAUX_SRC_PACK_0);
IF_EQUAL_RETURN(guid, MF_MT_DV_AAUX_CTRL_PACK_0);
IF_EQUAL_RETURN(guid, MF_MT_DV_AAUX_SRC_PACK_1);
IF_EQUAL_RETURN(guid, MF_MT_DV_AAUX_CTRL_PACK_1);
IF_EQUAL_RETURN(guid, MF_MT_DV_VAUX_SRC_PACK);
IF_EQUAL_RETURN(guid, MF_MT_DV_VAUX_CTRL_PACK);
IF_EQUAL_RETURN(guid, MF_MT_ARBITRARY_HEADER);
IF_EQUAL_RETURN(guid, MF_MT_ARBITRARY_FORMAT);
IF_EQUAL_RETURN(guid, MF_MT_IMAGE_LOSS_TOLERANT);
IF_EQUAL_RETURN(guid, MF_MT_MPEG4_SAMPLE_DESCRIPTION);
IF_EQUAL_RETURN(guid, MF_MT_MPEG4_CURRENT_SAMPLE_ENTRY);
IF_EQUAL_RETURN(guid, MF_MT_ORIGINAL_4CC);
IF_EQUAL_RETURN(guid, MF_MT_ORIGINAL_WAVE_FORMAT_TAG);
// Media types
IF_EQUAL_RETURN(guid, MFMediaType_Audio);
IF_EQUAL_RETURN(guid, MFMediaType_Video);
IF_EQUAL_RETURN(guid, MFMediaType_Protected);
IF_EQUAL_RETURN(guid, MFMediaType_SAMI);
IF_EQUAL_RETURN(guid, MFMediaType_Script);
IF_EQUAL_RETURN(guid, MFMediaType_Image);
IF_EQUAL_RETURN(guid, MFMediaType_HTML);
IF_EQUAL_RETURN(guid, MFMediaType_Binary);
IF_EQUAL_RETURN(guid, MFMediaType_FileTransfer);
IF_EQUAL_RETURN(guid, MFVideoFormat_AI44); // FCC('AI44')
IF_EQUAL_RETURN(guid, MFVideoFormat_ARGB32); // D3DFMT_A8R8G8B8
IF_EQUAL_RETURN(guid, MFVideoFormat_AYUV); // FCC('AYUV')
IF_EQUAL_RETURN(guid, MFVideoFormat_DV25); // FCC('dv25')
IF_EQUAL_RETURN(guid, MFVideoFormat_DV50); // FCC('dv50')
IF_EQUAL_RETURN(guid, MFVideoFormat_DVH1); // FCC('dvh1')
IF_EQUAL_RETURN(guid, MFVideoFormat_DVSD); // FCC('dvsd')
IF_EQUAL_RETURN(guid, MFVideoFormat_DVSL); // FCC('dvsl')
IF_EQUAL_RETURN(guid, MFVideoFormat_H264); // FCC('H264')
IF_EQUAL_RETURN(guid, MFVideoFormat_I420); // FCC('I420')
IF_EQUAL_RETURN(guid, MFVideoFormat_IYUV); // FCC('IYUV')
IF_EQUAL_RETURN(guid, MFVideoFormat_M4S2); // FCC('M4S2')
IF_EQUAL_RETURN(guid, MFVideoFormat_MJPG);
IF_EQUAL_RETURN(guid, MFVideoFormat_MP43); // FCC('MP43')
IF_EQUAL_RETURN(guid, MFVideoFormat_MP4S); // FCC('MP4S')
IF_EQUAL_RETURN(guid, MFVideoFormat_MP4V); // FCC('MP4V')
IF_EQUAL_RETURN(guid, MFVideoFormat_MPG1); // FCC('MPG1')
IF_EQUAL_RETURN(guid, MFVideoFormat_MSS1); // FCC('MSS1')
IF_EQUAL_RETURN(guid, MFVideoFormat_MSS2); // FCC('MSS2')
IF_EQUAL_RETURN(guid, MFVideoFormat_NV11); // FCC('NV11')
IF_EQUAL_RETURN(guid, MFVideoFormat_NV12); // FCC('NV12')
IF_EQUAL_RETURN(guid, MFVideoFormat_P010); // FCC('P010')
IF_EQUAL_RETURN(guid, MFVideoFormat_P016); // FCC('P016')
IF_EQUAL_RETURN(guid, MFVideoFormat_P210); // FCC('P210')
IF_EQUAL_RETURN(guid, MFVideoFormat_P216); // FCC('P216')
IF_EQUAL_RETURN(guid, MFVideoFormat_RGB24); // D3DFMT_R8G8B8
IF_EQUAL_RETURN(guid, MFVideoFormat_RGB32); // D3DFMT_X8R8G8B8
IF_EQUAL_RETURN(guid, MFVideoFormat_RGB555); // D3DFMT_X1R5G5B5
IF_EQUAL_RETURN(guid, MFVideoFormat_RGB565); // D3DFMT_R5G6B5
IF_EQUAL_RETURN(guid, MFVideoFormat_RGB8);
IF_EQUAL_RETURN(guid, MFVideoFormat_UYVY); // FCC('UYVY')
IF_EQUAL_RETURN(guid, MFVideoFormat_v210); // FCC('v210')
IF_EQUAL_RETURN(guid, MFVideoFormat_v410); // FCC('v410')
IF_EQUAL_RETURN(guid, MFVideoFormat_WMV1); // FCC('WMV1')
IF_EQUAL_RETURN(guid, MFVideoFormat_WMV2); // FCC('WMV2')
IF_EQUAL_RETURN(guid, MFVideoFormat_WMV3); // FCC('WMV3')
IF_EQUAL_RETURN(guid, MFVideoFormat_WVC1); // FCC('WVC1')
IF_EQUAL_RETURN(guid, MFVideoFormat_Y210); // FCC('Y210')
IF_EQUAL_RETURN(guid, MFVideoFormat_Y216); // FCC('Y216')
IF_EQUAL_RETURN(guid, MFVideoFormat_Y410); // FCC('Y410')
IF_EQUAL_RETURN(guid, MFVideoFormat_Y416); // FCC('Y416')
IF_EQUAL_RETURN(guid, MFVideoFormat_Y41P);
IF_EQUAL_RETURN(guid, MFVideoFormat_Y41T);
IF_EQUAL_RETURN(guid, MFVideoFormat_YUY2); // FCC('YUY2')
IF_EQUAL_RETURN(guid, MFVideoFormat_YV12); // FCC('YV12')
IF_EQUAL_RETURN(guid, MFVideoFormat_YVYU);
IF_EQUAL_RETURN(guid, MFAudioFormat_PCM); // WAVE_FORMAT_PCM
IF_EQUAL_RETURN(guid, MFAudioFormat_Float); // WAVE_FORMAT_IEEE_FLOAT
IF_EQUAL_RETURN(guid, MFAudioFormat_DTS); // WAVE_FORMAT_DTS
IF_EQUAL_RETURN(guid, MFAudioFormat_Dolby_AC3_SPDIF); // WAVE_FORMAT_DOLBY_AC3_SPDIF
IF_EQUAL_RETURN(guid, MFAudioFormat_DRM); // WAVE_FORMAT_DRM
IF_EQUAL_RETURN(guid, MFAudioFormat_WMAudioV8); // WAVE_FORMAT_WMAUDIO2
IF_EQUAL_RETURN(guid, MFAudioFormat_WMAudioV9); // WAVE_FORMAT_WMAUDIO3
IF_EQUAL_RETURN(guid, MFAudioFormat_WMAudio_Lossless); // WAVE_FORMAT_WMAUDIO_LOSSLESS
IF_EQUAL_RETURN(guid, MFAudioFormat_WMASPDIF); // WAVE_FORMAT_WMASPDIF
IF_EQUAL_RETURN(guid, MFAudioFormat_MSP1); // WAVE_FORMAT_WMAVOICE9
IF_EQUAL_RETURN(guid, MFAudioFormat_MP3); // WAVE_FORMAT_MPEGLAYER3
IF_EQUAL_RETURN(guid, MFAudioFormat_MPEG); // WAVE_FORMAT_MPEG
IF_EQUAL_RETURN(guid, MFAudioFormat_AAC); // WAVE_FORMAT_MPEG_HEAAC
IF_EQUAL_RETURN(guid, MFAudioFormat_ADTS); // WAVE_FORMAT_MPEG_ADTS_AAC
return NULL;
}
Media Buffers
Media Buffer对象用于管理内存块，用于Pipeline组件之间移动数据。应用程序只有在开发pipeline组件和不通过Media Session直接使用Pipeline组件这2种情况下，才需要使用Media Buffer对象。
接口：IMFMediaBuffer
创建对象：MFCreateMemoryBuffer或者MFCreateAlignedMemoryBuffer
非压缩图像的缓冲区：对于Direct3D表面这样的非压缩图像，可以使用IMF2DBuffer接口。MFCreateDXSurfaceBuffer可以创建DirectX表面对象，该对象实现了IMFMediaBuffer和IMF2DBuffer接口。
Media Samples
一个MediaSample对象存储了一个视频帧或者一个音频帧。一个Media Sample包含了0个或者多个Buffer，例如：在.asf文件中，一个视频帧通常就是由多个asf包组成。
接口：IMFSample。
创建对象：MFCreateSample；
添加Buffer：IMFSample::AddBuffer。