MediaCodec作为解码器，用于将解码后的数据发送到两个表面。 如何避免大量中继数据复制？

Question

To configure a decoder, we call

decoder.configure(format,surface, crypto,flags) .

And then, in

MediaCodec.Callback.onOutputBufferAvailable() ,

we call

codec.releaseOutputBuffer(index,System.nanoTime())

to draw the decoded video on that surface which is passed in configure() function. Do we have a way to send that output buffer to another surface which is created by an encoder from

MediaCodec.createInputSurface()

to avoid big trunk data copy.

Answer 1

There is no way to do that. After taking look into Nvidia Android source code and omx decoder implement; if we need to send data into two surfaces, we have to use native DMA memory copy functions from manufacturer, or using native omx decoder directly.