Method onDecoderOutputChangedImage

piomxtextures_src/openmaxiltextureloader.cpp:380–473

------------------------------------------------------------------------------ | OpenMAXILTextureLoader::onDecoderOutputChanged +-----------------------------------------------------------------------------*/

|    OpenMAXILTextureLoader::onDecoderOutputChanged
+-----------------------------------------------------------------------------*/
void OpenMAXILTextureLoader::onDecoderOutputChangedImage(
        EGLDisplay eglDisplay,
        EGLContext eglContext,
        GLuint& texture
        )
{
    // Setup the input for the render with the output of the decoder.
    OMX_PARAM_PORTDEFINITIONTYPE portdef;
    portdef.nSize = sizeof(OMX_PARAM_PORTDEFINITIONTYPE);
    OMX_INIT_STRUCTURE(portdef);
    portdef.nPortIndex = m_iOutPortDecode;
    compImageDecoder->GetParameter(OMX_IndexParamPortDefinition, &portdef);
    portdef.nPortIndex = m_iInPortRender;
    compEGLRender->SetParameter(OMX_IndexParamPortDefinition, &portdef);

    // Tunnel output of the decoder with the input of the renderer.
    compImageDecoder->SetupTunnel(m_iOutPortDecode, compEGLRender.get(), m_iInPortRender);

    // Enable the ports involved in the tunnel.
    compImageDecoder->sendCommand(OMX_CommandPortEnable, m_iOutPortDecode, NULL);
    compEGLRender->sendCommand(OMX_CommandPortEnable, m_iInPortRender, NULL);

    // Put renderer in idle state (this allows the outport of the decoder to become enabled).
    compEGLRender->sendCommand(OMX_CommandStateSet, OMX_StateIdle, NULL);
    compEGLRender->waitForEvent(OMX_EventCmdComplete, OMX_CommandStateSet, OMX_StateIdle, TIMEOUT_MS);

    // Once the state changes, both ports should become enabled and the renderer output
    // should generate a settings changed event.
    compImageDecoder->waitForEvent(OMX_EventCmdComplete, OMX_CommandPortEnable, m_iOutPortDecode, TIMEOUT_MS);
    compEGLRender->waitForEvent(OMX_EventCmdComplete, OMX_CommandPortEnable, m_iInPortRender, TIMEOUT_MS);
    compEGLRender->waitForEvent(OMX_EventPortSettingsChanged, m_iOutPortRender, 0, TIMEOUT_MS);

    // NOTE : OpenMAX official spec says that upon receving OMX_EventPortSettingsChanged event, the
    // port shall be disabled and then re-enabled (see 3.1.1.4.4 of IL v1.2.0 specification),
    // but since we have not enabled the port, I don't think we need to do anything.

    // Query output buffer requirements for renderer and provide the native display
    // the renderer will use.
    portdef.nSize = sizeof(OMX_PARAM_PORTDEFINITIONTYPE);
    portdef.nVersion.nVersion = OMX_VERSION;
    portdef.nPortIndex = m_iOutPortRender;
    compEGLRender->GetParameter(OMX_IndexParamPortDefinition, &portdef);
    portdef.format.video.pNativeWindow = eglDisplay;
    compEGLRender->SetParameter(OMX_IndexParamPortDefinition, &portdef);

    // Assume this, if it's not true, more code will need to be written to handle it.
    assert(portdef.nBufferCountActual == 1);

    // Put renderer in EXECUTING and wait for port settings changed event.
    compEGLRender->sendCommand(OMX_CommandStateSet, OMX_StateExecuting, NULL);
    compEGLRender->waitForEvent(OMX_EventCmdComplete, OMX_CommandStateSet, OMX_StateExecuting, TIMEOUT_MS);

    // show some logging so user knows it's working
    char sLog[300];
    snprintf(sLog, sizeof(sLog), "Width: %u Height: %u Output Color Format: 0x%x Buffer Size: %u",
             (unsigned int) portdef.format.video.nFrameWidth,
             (unsigned int) portdef.format.video.nFrameHeight,
             (unsigned int) portdef.format.video.eColorFormat,