iOs audio project

I need a stereo FIR filter for audio file playback in iOS. The user must be able to select an audio file from the "Files" directory, and playback to the headphone output. There is to be a separate FIR filter applied to the left and right channel. There is to be 2048 co-effiecients in the FIR filter. The FIR filter co-efficients MUST be able to be updated live whilst the audio is playing, and not restart the audio playback file. It should act like a continuous tone control like any EQ filter. The audio file shall be at 48kHz. If an audio file is selected that is not 48kHz then the audio file shall be converted to 48kHz. There shall be a stop button and a loop/repeat button. Must be written in mostly swift wherever possible. The coding shall only be done in Xcode and no third party software compiler. It is recommended that the programmer has experience with VDSP as the convolution function does what is needed. This is more about the backend use for an existing app so user interface is not required to be neat. Just a simple loop slider, and stop button and select audio file is fine