我目前正在尝试弄清楚如何通过Android 4.0中的OpenMAX访问Camera。该文档对我来说还不够,因此我目前在为下一次调用检索正确的XADataSource
的过程中感到困惑。
(*_engine)->CreateMediaRecorder(_engine,
&_mediaRecorder, //pRecorder
nullptr, //pAudioSrc
XADataSource *, //pImageVideoSrc
XADataSink *, //pDataSnk
XAuint32, // numInterfaces
const XAInterfaceID *, //pInterfaceIds
const XAboolean *, //pInterfaceRequired
);
并且请饶恕我使用Java-“answers”。
最佳答案
这基本上是XADataSource的定义,取自http://www.khronos.org/registry/omxal/specs/OpenMAX_AL_1_1_Specification.pdf
typedef struct XADataSource_ {
void * pLocator;
void * pFormat;
} XADataSource;
字段包括:
Field Description
pLocator Pointer to the specified data locator structure. This may point to any of the following structures.
XADataLocator_Address
XADataLocator_IODevice
XADataLocator_URI
XADataLocator_MediaObject
XADataLocator_Null
XADataLocator_ContentPipe
The first field of each of these structures includes the 32 bit locatorType field, which identifies
the locator type (see XA_DATALOCATOR definitions) and hence the structure pointed to.
Note: The available XA_DATALOCATOR definitions may be extended through an API extension.
pFormat A pointer to the specified format structure. This may point to any of the following structures.
XADataFormat_PCM (Deprecated)
XADataFormat_PCM_EX
XADataFormat_MIME
XADataFormat_RawImage
The first field of each of these structures includes the 32 bit formatType field, which identifies the
format type (XA_DATAFORMAT definitions) and hence the structure pointed to. pFormat is ignored
if pLocator is XADataLocator_IODevice
抱歉,无法更好地设置其格式,但是如果您还没有这样做,我建议无论如何都要检查该文档。