In Arria 10 Device, How to convert to I2S format from the audio extracted from HDMI IP core?

[idemosaic]

hdmi-in  ----> HDMI-RX IP(arria 10) -----------> PCM1770 --> analog audio out

HDMI-RX EDID set support：1ch, 48KHz fs， 24bit audio in;

from HDMI-RX IP signals:

1bit     audio_clk = ls_clk[0];

1bit      audio_de = datavalid;

256bits    audio_data = i just need LSB 64bit   (1ch, L & R)

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PCM1770 : audio output chip

input signals:

          SCKI : almost named : MCLK

          LRCK = WS = audio fs;

          DATA = audio sample data, serial

          BCK    = DATA bit clock;

support 24bit sample audio data;

BCK = 64fs;

            I don't have any ideas to implement this module.

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Question:

   Q1 : Do I need to recover the accurate audio sample clock？and HOW

                             i know :128 * fs = f_TMDS * N/CTS.  from hdmi spec.

   Q2 : Does audio_data[63:0] is the DATA what PCM1770 need?  No need to convert?

Any answer may be helpful to me.

I hope you can give me some advice， Thank U！

2022.9.14 AM 10:02