android - Getting SurfaceTexture pixels fast or trick with TextArea -


i have qt realtime broadcasting chat application android (v 4.1, api 16), sends h.264/aac chunks rtmp server.

for now, application uses surfaceview capturing frames camera , in onpreviewframe function encode frames h.264 chunks , in other thread create rtmp chunks, sending rtmp server, wrote above.

background transparent (with qt::windowstaysontophint flag) , qml ui draws above camera's surfaceview - works pretty well, without lags , other. but, when tried use qml's textarea (for writing chat messages), above surfaceview, there long delays on devices (and not on samsung's) when press on key on android's virtual keyboard, did app absolutely unusable. example, type "lag" on keyboard, , there 3-4 second delay between showing every symbol in textarea ))): surfaceview , broadcast works without lags.

so, dear developers, shall solve problem?

for now, moved camera's preview surfacetexture , draw using qt's qsggeometrynode, there problem: how read pixels surfacetexture more efficient? possible make performance faster or similar onpreviewframe? may moving in wrong direction , can trick textarea?

thanks!


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