Make MediaCodecVideoRenderer::shouldUsePlaceholderSurface protected.

[khouzam]

This enables a derived renderer to disable the placeholder surface.

Not having a placeholder surface allows to delay instantiating the codecs until we have a surface. This allows to have more players ready without having their decoders loaded.

This follows the mode that shouldUseDetachedSurface is protected and overridable by a derived class.

Since getSurfaceForCodec must call hasSurfaceForCodec, the check for the placeholder surface in getSurfaceForCodec should not trigger if we disable the placeholder surface as hasSurfaceForCodec would have returned false.

[microkatz]

@khouzam

Thanks for submitting your request! Just a curiosity, have you looked at MediaCodecVideoRenderer::shouldInitCodec for your use case? Its already overridable and utilized by MediaCodecRenderer to decide if the decoder should be initialized.

[khouzam]

@microkatz Thanks for the suggestion, I'll experiment with it, but while this can prevent the initialization of the codec, it will still create the PlaceholderSurface when a null surface gets set.