From 21c38f512b36546503b929420b64c1f3bbfc32d6 Mon Sep 17 00:00:00 2001
From: Josh Wu <joshwu@google.com>
Date: Wed, 6 Dec 2023 16:25:41 +0800
Subject: [PATCH] ffplay routing

---
 examples/run_unicast_server.py | 47 ++++++++++++++++++++++++++++++++--
 1 file changed, 45 insertions(+), 2 deletions(-)

diff --git a/examples/run_unicast_server.py b/examples/run_unicast_server.py
index 4dadec859..e71cbeff9 100644
--- a/examples/run_unicast_server.py
+++ b/examples/run_unicast_server.py
@@ -19,12 +19,14 @@
 import logging
 import sys
 import os
+import struct
 from bumble.core import AdvertisingData
-from bumble.device import Device
+from bumble.device import Device, CisLink
 from bumble.hci import (
     CodecID,
     CodingFormat,
     OwnAddressType,
+    HCI_IsoDataPacket,
     HCI_LE_Set_Extended_Advertising_Parameters_Command,
 )
 from bumble.profiles.bap import (
@@ -115,7 +117,13 @@ async def main() -> None:
                     ),
                     (
                         AdvertisingData.FLAGS,
-                        bytes([AdvertisingData.LE_GENERAL_DISCOVERABLE_MODE_FLAG]),
+                        bytes(
+                            [
+                                AdvertisingData.LE_GENERAL_DISCOVERABLE_MODE_FLAG
+                                | AdvertisingData.BR_EDR_HOST_FLAG
+                                | AdvertisingData.BR_EDR_CONTROLLER_FLAG
+                            ]
+                        ),
                     ),
                     (
                         AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
@@ -124,6 +132,41 @@ async def main() -> None:
                 ]
             )
         )
+        subprocess = await asyncio.create_subprocess_shell(
+            f'dlc3 | ffplay pipe:0',
+            stdin=asyncio.subprocess.PIPE,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+        )
+
+        stdin = subprocess.stdin
+        assert stdin
+
+        # Write a fake LC3 header to dlc3.
+        stdin.write(
+            bytes([0x1C, 0xCC])  # Header.
+            + struct.pack(
+                '<HHHHHHI',
+                18,  # Header length.
+                24000 // 100,  # Sampling Rate(/100Hz).
+                0,  # Bitrate(unused).
+                1,  # Channels.
+                10000 // 10,  # Frame duration(/10us).
+                0,  # RFU.
+                0x0FFFFFFF,  # Frame counts.
+            )
+        )
+
+        def on_pdu(pdu: HCI_IsoDataPacket):
+            # LC3 format: |frame_length(2)| + |frame(length)|.
+            if pdu.iso_sdu_length:
+                stdin.write(struct.pack('<H', pdu.iso_sdu_length))
+            stdin.write(pdu.iso_sdu_fragment)
+
+        def on_cis(cis_link: CisLink):
+            cis_link.on('pdu', on_pdu)
+
+        device.once('cis_establishment', on_cis)
 
         await device.start_extended_advertising(
             advertising_properties=(