stagefright: return encrypted input buffer for secure codecs

    if (index < buffers->size()) {

        const BufferInfo &info = buffers->itemAt(index);

        if (info.mOwnedByClient) {

            // by the time buffers array is initialized, crypto is set

            if (portIndex == kPortIndexInput && mCrypto != NULL) {

                *buffer = info.mEncryptedData;

            } else {

                *buffer = info.mData;

            }

            *format = info.mFormat;

        }

    }