Previewing

• When to Use
• Available APIs
• Limitations and Constraints
• How to Develop

When to Use

Use the camera module APIs to generate and play video streams.

Available APIs

For details, see the available APIs described in development guidelines on photographing.

Limitations and Constraints

None

How to Develop

1. Perform step 1 through step 4 described in development guidelines on photographing.

2. Set the preview area.

   Surface *surface = Surface::CreateSurface();
   /* Set the display area. */
   surface->SetUserData("region_position_x", "480"); // X-coordinate of the upper left corner of the rectangle
   surface->SetUserData("region_position_y", "270"); // Y-coordinate of the upper left corner of the rectangle
   surface->SetUserData("region_width", "960"); // Width
   surface->SetUserData("region_height", "540"); // Height
   
   fc->AddSurface(*surface);
   

3. Start and stop previewing.

   stateCallback->camera_->TriggerLoopingCapture(*fc); // Start previewing.
   stateCallback->camera_->StopLoopingCapture(); // Stop previewing.