15 lines
2.5 KiB
Plaintext
15 lines
2.5 KiB
Plaintext
{
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"nodes":[
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{"id":"d6c4368826cc2627","x":-672,"y":40,"width":577,"height":200,"type":"text","text":"`IMFAttributes`\n\n```cpp\npDeviceAttributes->SetGUID(\n MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE,\n MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_AUDCAP_GUID)\npDeviceAttributes->SetString(\n MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_AUDCAP_ENDPOINT_ID,\n deviceSymbolic.c_str())\n```\n"},
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{"id":"671ac7c80cfb589a","x":-760,"y":-900,"width":754,"height":300,"type":"text","text":"`IMFSourceReader`\n> 用來讀取 MediaSource，要搭配 `IMFAttributes` 指定讀取方式\n\n```cpp\nIMFSourceReader* pSourceReader = NULL;\nIMFAttributes* pAttributes = NULL;\n\nMFCreateAttributes(&pAttributes, 1);\npAttributes->SetUnknown(MF_SOURCE_READER_ASYNC_CALLBACK, returnDevice->sourceReaderCallback);\nMFCreateSourceReaderFromMediaSource(\n pMediaSource,\n pAttributes,\n &pSourceReader)\n```"},
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{"id":"5ab8d6f75e911379","x":-649,"y":-500,"width":531,"height":204,"type":"text","text":"`IMFMediaSource`\n\n> 媒體來源是一種產生媒體資料的物件。 例如，資料可能來自視訊檔案、網路串流或硬體裝置，例如相機。 每個媒體來源都包含一或多個資料流程，而每個資料流程都會提供一種類型的資料，例如音訊或視訊。\n\n```cpp\nIMFMediaSource* pMediaSource = NULL;\npDevice->ActivateObject(IID_PPV_ARGS(&pMediaSource)\n```"},
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{"id":"3df0dd59ad66c803","x":-633,"y":-200,"width":500,"height":140,"type":"text","text":"`IMFActivate(pDevice)`\n\n它就是你需要的裝置\n\n```cpp\nMFCreateDeviceSourceActivate(pDeviceAttributes, &pDevice)\n```\n"},
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{"id":"c0627e6385587472","x":-1280,"y":-750,"width":440,"height":150,"color":"3","type":"text","text":"因為使用了 `MF_SOURCE_READER_ASYNC_CALLBACK`\n\n所以要在另一個 thread 裡面呼叫 `pSourceReader->ReadSample`\n\n`pSourceReader` 會透過我們自己定義的 `SourceReaderCB::OnReadSample()` 取得畫面或是聲音資料。"}
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