GstBaseTransformClass

Subclasses can override any of the available virtual methods or not, as needed. At minimum either transform or transform_ip need to be overridden. If the element can overwrite the input data with the results (data is of the same type and quantity) it should provide transform_ip.

struct GstBaseTransformClass {

GstElementClass parentClass;

bool passthroughOnSameCaps;

bool transformIpOnPassthrough;

GstCaps* function(GstBaseTransform* trans, GstPadDirection direction, GstCaps* caps, GstCaps* filter) transformCaps;

GstCaps* function(GstBaseTransform* trans, GstPadDirection direction, GstCaps* caps, GstCaps* othercaps) fixateCaps;

int function(GstBaseTransform* trans, GstPadDirection direction, GstCaps* caps) acceptCaps;

int function(GstBaseTransform* trans, GstCaps* incaps, GstCaps* outcaps) setCaps;

int function(GstBaseTransform* trans, GstPadDirection direction, GstQuery* query) query;

int function(GstBaseTransform* trans, GstQuery* query) decideAllocation;

int function(GstBaseTransform* trans, GstQuery* query, GType api, GstStructure* params) filterMeta;

int function(GstBaseTransform* trans, GstQuery* decideQuery, GstQuery* query) proposeAllocation;

int function(GstBaseTransform* trans, GstPadDirection direction, GstCaps* caps, size_t size, GstCaps* othercaps, size_t* othersize) transformSize;

int function(GstBaseTransform* trans, GstCaps* caps, size_t* size) getUnitSize;

int function(GstBaseTransform* trans) start;

int function(GstBaseTransform* trans) stop;

int function(GstBaseTransform* trans, GstEvent* event) sinkEvent;

int function(GstBaseTransform* trans, GstEvent* event) srcEvent;

GstFlowReturn function(GstBaseTransform* trans, GstBuffer* input, GstBuffer** outbuf) prepareOutputBuffer;

int function(GstBaseTransform* trans, GstBuffer* input, GstBuffer* outbuf) copyMetadata;

int function(GstBaseTransform* trans, GstBuffer* outbuf, GstMeta* meta, GstBuffer* inbuf) transformMeta;

void function(GstBaseTransform* trans, GstBuffer* buffer) beforeTransform;

GstFlowReturn function(GstBaseTransform* trans, GstBuffer* inbuf, GstBuffer* outbuf) transform;

GstFlowReturn function(GstBaseTransform* trans, GstBuffer* buf) transformIp;

GstFlowReturn function(GstBaseTransform* trans, int isDiscont, GstBuffer* input) submitInputBuffer;

GstFlowReturn function(GstBaseTransform* trans, GstBuffer** outbuf) generateOutput;

void*[18] GstReserved;

}

Members

Variables

acceptCaps int function(GstBaseTransform* trans, GstPadDirection direction, GstCaps* caps) acceptCaps;
beforeTransform void function(GstBaseTransform* trans, GstBuffer* buffer) beforeTransform;
copyMetadata int function(GstBaseTransform* trans, GstBuffer* input, GstBuffer* outbuf) copyMetadata;
decideAllocation int function(GstBaseTransform* trans, GstQuery* query) decideAllocation;
filterMeta int function(GstBaseTransform* trans, GstQuery* query, GType api, GstStructure* params) filterMeta;
fixateCaps GstCaps* function(GstBaseTransform* trans, GstPadDirection direction, GstCaps* caps, GstCaps* othercaps) fixateCaps;
generateOutput
GstFlowReturn function(GstBaseTransform* trans, GstBuffer** outbuf) generateOutput;
getUnitSize int function(GstBaseTransform* trans, GstCaps* caps, size_t* size) getUnitSize;
parentClass GstElementClass parentClass;: Element parent class
passthroughOnSameCaps bool passthroughOnSameCaps;: If set to TRUE, passthrough mode will be automatically enabled if the caps are the same. Set to FALSE by default.
prepareOutputBuffer
GstFlowReturn function(GstBaseTransform* trans, GstBuffer* input, GstBuffer** outbuf) prepareOutputBuffer;
proposeAllocation int function(GstBaseTransform* trans, GstQuery* decideQuery, GstQuery* query) proposeAllocation;
query int function(GstBaseTransform* trans, GstPadDirection direction, GstQuery* query) query;
setCaps int function(GstBaseTransform* trans, GstCaps* incaps, GstCaps* outcaps) setCaps;
sinkEvent int function(GstBaseTransform* trans, GstEvent* event) sinkEvent;
srcEvent int function(GstBaseTransform* trans, GstEvent* event) srcEvent;
start int function(GstBaseTransform* trans) start;
stop int function(GstBaseTransform* trans) stop;
submitInputBuffer GstFlowReturn function(GstBaseTransform* trans, int isDiscont, GstBuffer* input) submitInputBuffer;
transform GstFlowReturn function(GstBaseTransform* trans, GstBuffer* inbuf, GstBuffer* outbuf) transform;
transformCaps GstCaps* function(GstBaseTransform* trans, GstPadDirection direction, GstCaps* caps, GstCaps* filter) transformCaps;
transformIp GstFlowReturn function(GstBaseTransform* trans, GstBuffer* buf) transformIp;
transformIpOnPassthrough bool transformIpOnPassthrough;: If set to TRUE, transform_ip will be called in passthrough mode. The passed buffer might not be writable. When FALSE, neither transform nor transform_ip will be called in passthrough mode. Set to TRUE by default.
transformMeta int function(GstBaseTransform* trans, GstBuffer* outbuf, GstMeta* meta, GstBuffer* inbuf) transformMeta;
transformSize int function(GstBaseTransform* trans, GstPadDirection direction, GstCaps* caps, size_t size, GstCaps* othercaps, size_t* othersize) transformSize;