台湾清华RTlab实验室Bellagio OpenMax的Code_Trace.ppt

RTLAB Bellagio Data Processing Flow 清大資工 RTLAB 許宏榮 Outline Bellagio Code Trace (Video) Buffer Allocate and Management Data Flow Between Ports (Tunneled) Dynamic Port Reconfiguration Bellagio Code TraceBuffer 架構 A = Video Decoder B= Color Converter C= Sink Buffer Supplier: A[1] , B[1] ports Buffer Non-Supplier: A[0] , B[0] , C[0] ports Setup Tunnel ComponentTunnelRequest( * openmaxStandPort, hTunneledComp, nTunneledPort , *pTunnelSetup) If (port is Input Port eg.B[0] ) 認定A[1]為自己的Supplier 認定自己為Non-supplier OMX_GetParameter(A[1],…) OMX_SetParameter(A[1],…) Else (A[1]) 認定B[0]是Tunnel的另一端 認定自己是Supplier Tunneled Buffer Allocate(Load_State ? Idle_State) State transition to Idle in the case of Tunneled Components Message_Handler::DoStateSet( ) Load to Idle OMX_ERRORTYPE base_port_UseBuffer( omx_base_PortType *openmaxStandPort, OMX_BUFFERHEADERTYPE** ppBufferHdr, OMX_U32 nPortIndex, OMX_PTR , OMX_U32 nSizeBytes, OMX_U8 * pBuffer) openmaxStandPort: B[0] ppBufferHdr: A[1]的pInternalBufferStorage nPortIndex: nTunneledPort = 0 pAppPrivate: NULL nSizeBytes: Size of A[1] buffer pBuffer: Pointer to actual block of memory that is acting as the buffer struct OMX_BUFFERHEADERTYPE OMX_BUFFERHEADERTYPE** ppBufferHdr Buffer Default Size A[0] = 4096 bytes A[1] = 460800 bytes //640*480*1.5 B[0] = 460800 bytes B[1] = 460800 * 3 bytes C[0] = 由video.nFrameWidth (初始為0) video.nFrameHeight(初始為0)決定 (Buffer size後來可能會因為Port Reconfigure而改變) Tunneled Data Flow IL Client Level IL Client call OMX_AllocateBuffer() 配置 4096 bytes to A[0]並填入相關值給 pBuffer1 header. IL Client call OMX_SendCommand() to video decoder component to go to executing state. tsem_down(appPriv-decoderEventSem); Wait for callback. (等待state change 完成). Message_Handler::DoStateSet( ) Idle ? Executing state Check all of the Tunneled port. If port is Tunneled and Supplier, then signal Buffer management thread. (之後FillThisBuffer()來做signal的動作) IL Client Level 利用fread