USB Audio: libusb-backed iso capture (fixes car-dash)

ft8cn/app/build.gradle

@@ -39,10 +39,20 @@ android {
 
         externalNativeBuild {
             cmake {
-                cppFlags '-JENABLE_XOM=false'//Disable XOM
-
+                // No extra cppFlags — the upstream FT8CN's '-JENABLE_XOM=false' was
+                // a typo (likely intended -D, not -J) that clang rejects when an
+                // actual native build is wired up. It had no effect before because
+                // the legacy libft8cn.so is shipped prebuilt via jniLibs.
+                cppFlags ''
             }
         }
+
+        // The legacy libft8cn.so binaries in app/libs/<abi>/ stay packaged via
+        // jniLibs.srcDirs; this filter just keeps NDK builds focused on the
+        // four ABIs we ship and prevents an unexpected ABI slipping in.
+        ndk {
+            abiFilters 'arm64-v8a', 'armeabi-v7a', 'x86', 'x86_64'
+        }
     }
 
     signingConfigs {
@@ -102,12 +112,12 @@ android {
             returnDefaultValues = true
         }
     }
-//    externalNativeBuild {
-//        cmake {
-//            path file('src/main/cpp/CMakeLists.txt')
-//            version '3.18.1'
-//        }
-//    }
+    externalNativeBuild {
+        cmake {
+            path file('src/main/cpp/CMakeLists.txt')
+            version '3.22.1'
+        }
+    }
 
     sourceSets {
         main {

ft8cn/app/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,72 @@
+# FT8AF native USB audio module.
+#
+# Builds libft8af_usb.so containing our libusb-backed USB Audio Class
+# capture path, with libusb 1.0.27 statically linked in. The shared
+# library is packaged alongside the upstream-prebuilt libft8cn.so
+# (which we don't compile here — see jniLibs.srcDirs = ['libs']).
+#
+# Why libusb: Android's UsbRequest API silently fails to drive
+# isochronous transfers on some kernels (notably automotive Android
+# variants), throwing IllegalStateException on first queue. libusb
+# uses USBDEVFS ioctls directly and is the most battle-tested option
+# for USB audio on Android.
+
+cmake_minimum_required(VERSION 3.18.1)
+
+project(ft8af_native)
+
+# ---------------------------------------------------------------------------
+# libusb 1.0.27 (static)
+# ---------------------------------------------------------------------------
+# Source list mirrors libusb/android/jni/libusb.mk — only the Linux/USBFS
+# backend + POSIX threads/events; the macOS/Windows/Haiku/etc. backends in
+# libusb/os/ are intentionally not compiled.
+
+set(LIBUSB_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/libusb)
+
+add_library(usb1.0 STATIC
+        ${LIBUSB_ROOT}/libusb/core.c
+        ${LIBUSB_ROOT}/libusb/descriptor.c
+        ${LIBUSB_ROOT}/libusb/hotplug.c
+        ${LIBUSB_ROOT}/libusb/io.c
+        ${LIBUSB_ROOT}/libusb/sync.c
+        ${LIBUSB_ROOT}/libusb/strerror.c
+        ${LIBUSB_ROOT}/libusb/os/linux_usbfs.c
+        ${LIBUSB_ROOT}/libusb/os/events_posix.c
+        ${LIBUSB_ROOT}/libusb/os/threads_posix.c
+        ${LIBUSB_ROOT}/libusb/os/linux_netlink.c
+)
+
+target_include_directories(usb1.0
+        PUBLIC
+        ${LIBUSB_ROOT}/libusb
+        PRIVATE
+        ${LIBUSB_ROOT}/android
+        ${LIBUSB_ROOT}/libusb/os
+)
+
+# libusb assumes POSIX threads, eventfd, timerfd, etc. — all present on
+# Android. Hidden visibility matches upstream's Android build so we don't
+# accidentally re-export libusb symbols from our .so.
+target_compile_options(usb1.0 PRIVATE
+        -fvisibility=hidden
+        -pthread
+        -Wno-pointer-arith
+        -Wno-deprecated-declarations
+)
+
+# ---------------------------------------------------------------------------
+# libft8af_usb.so — our JNI bridge
+# ---------------------------------------------------------------------------
+
+add_library(ft8af_usb SHARED
+        usb_audio.cpp
+        usb_audio_capture.cpp
+)
+
+find_library(log-lib log)
+
+target_link_libraries(ft8af_usb
+        usb1.0
+        ${log-lib}
+)

ft8cn/app/src/main/cpp/libusb/AUTHORS

@@ -0,0 +1,224 @@
+Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
+Copyright © 2007-2009 Daniel Drake <dsd@gentoo.org>
+Copyright © 2010-2012 Peter Stuge <peter@stuge.se>
+Copyright © 2008-2016 Nathan Hjelm <hjelmn@users.sourceforge.net>
+Copyright © 2009-2013 Pete Batard <pete@akeo.ie>
+Copyright © 2009-2013 Ludovic Rousseau <ludovic.rousseau@gmail.com>
+Copyright © 2010-2012 Michael Plante <michael.plante@gmail.com>
+Copyright © 2011-2013 Hans de Goede <hdegoede@redhat.com>
+Copyright © 2012-2013 Martin Pieuchot <mpi@openbsd.org>
+Copyright © 2012-2013 Toby Gray <toby.gray@realvnc.com>
+Copyright © 2013-2018 Chris Dickens <christopher.a.dickens@gmail.com>
+
+Other contributors:
+Aaron Luft
+Adam Korcz
+Addison Crump
+Adrian Bunk
+Adrien Destugues
+Akshay Jaggi
+Alan Ott
+Alan Stern
+Aleksandr Mezin
+Alexander Mot
+Alexander Pyhalov
+Alexander Schlarb
+Alexander Stein
+Alex Feinman
+Alex Vatchenko
+Andrew Aldridge
+Andrew Fernandes
+Andrew Goodney
+Andy Chunyu
+Andy McFadden
+Angus Gratton
+Anil Nair
+Ankur Verma
+Anthony Clay
+Antonio Ospite
+Artem Egorkine
+Aurelien Jarno
+Axel Gembe
+Aymeric Vincent
+Baruch Siach
+Bastien Nocera
+Bei Zhang
+Bence Csokas
+Benjamin Berg
+Benjamin Dobell
+Bohdan Tymkiv
+Brad Smith
+Brent Rector
+Bruno Harbulot
+Carl Karsten
+Christophe Zeitouny
+Chris Zhu
+Chunyu Xie
+Colin Walters
+Craig Hutchinson
+Dave Camarillo
+David Engraf
+Davidlohr Bueso
+David Moore
+Dmitry Fleytman
+Dmitry Kostjuchenko
+Dmitry Zakablukov
+Dominik Boehi
+Doug Johnston
+Edgar Fuß
+Evan Hunter
+Evan Miller
+Fabrice Fontaine
+Federico Manzan
+Felipe Balbi
+Florian Albrechtskirchinger
+Francesco Montorsi
+Francisco Facioni
+Francis Hart
+Frank Li
+Frederik Carlier
+Freek Dijkstra
+Gaurav Gupta
+Graeme Gill
+Greg Kroah-Hartman
+Gustavo Zacarias
+Haidong Zheng
+Hans Ulrich Niedermann
+Harry Mallon
+Hector Martin
+Hoi-Ho Chan
+Ido Yariv
+Igor Anokhin
+Ihor Dutchak
+Ilya Konstantinov
+Ingvar Stepanyan
+Jakub Klama
+James Hanko
+Jeffrey Nichols
+Jie Zhang
+Jim Chen
+Johann Richard
+John Keeping
+John Sheu
+Jonas Malaco
+Jonathon Jongsma
+Joost Muller
+Josh Gao
+Joshua Blake
+Joshua Hou
+Joshua M. Clulow
+Juan Cruz Viotti
+Julian Scheel
+Justin Bischoff
+Karsten Koenig
+Keith Ahluwalia
+Kenjiro Tsuji
+Kimura Masaru
+Konrad Rzepecki
+Kuangye Guo
+Lars Kanis
+Lars Wirzenius
+Lei Chen
+Léo Lam
+Liang Yunwang
+Lonnie Abelbeck
+Luca Longinotti
+Luz Paz
+Mac Wang
+Marco Trevisan (Treviño)
+Marcus Meissner
+Mario Kleiner
+Mark Kuo
+Markus Heidelberg
+Martin Ettl
+Martin Koegler
+Martin Ling
+Martin Thierer
+Mathias Hjärtström
+Matthew Stapleton
+Matthias Bolte
+Michael Dickens
+Michel Zou
+Mike Frysinger
+Mikhail Gusarov
+Mikolaj Kucharski
+Morgan Leborgne
+Moritz Fischer
+Nancy Li
+Nia Alarie
+Nicholas Corgan
+Niklas Gürtler
+Omri Iluz
+Orhan aib Kavrakoglu
+Orin Eman
+Ozkan Sezer
+Pablo Prietz
+Patrick Stewart
+Paul Cercueil
+Paul Fertser
+Paul Qureshi
+Pekka Nikander
+Petr Pazourek
+Philémon Favrod
+Pino Toscano
+Rob Walker
+Romain Vimont
+Roman Kalashnikov
+Rosen Penev
+Ryan Hileman
+Ryan Metcalfe
+Ryan Schmidt
+Saleem Rashid
+Sameeh Jubran
+Sean McBride
+Sebastian Pipping
+Sebastian von Ohr
+Sergey Serb
+Shawn Hoffman
+Simon Chan
+Simon Haggett
+Simon Newton
+Slash Gordon
+Stefan Agner
+Stefan Tauner
+Steinar H. Gunderson
+Stephen Groat
+Sylvain Fasel
+Theo Buehler
+Thomas Röfer
+Tim Hutt
+Tim Roberts
+Tobias Klauser
+Toby Peterson
+Tormod Volden
+Trygve Laugstøl
+Uri Lublin
+Uwe Bonnes
+Vasily Khoruzhick
+Vegard Storheil Eriksen
+Venkatesh Shukla
+Vianney le Clément de Saint-Marcq
+Victor Toso
+Vinicius Tinti
+Vitali Lovich
+Vladimir Beloborodov
+William Orr
+William Skellenger
+Xiaofan Chen
+Yegor Yefremov
+Zeng Guang
+Zhiqiang Liu
+Zoltán Kovács
+Сергей Валерьевич
+Ларионов Даниил
+Роман Донченко
+jonner
+orbitcowboy
+osy
+parafin
+RipleyTom
+Seneral
+saur0n
+SomeAlphabetGuy
+winterrace
+xloem