jack: Initial shot at a JACK audio target.

http://jackaudio.org/

Fixes Bugzilla #2163.
(with several more commits following to improve this code.)

CMakeLists.txt

@@ -279,6 +279,8 @@ set_option(SDL_DLOPEN          "Use dlopen for shared object loading" ${SDL_DLOP
 set_option(OSS                 "Support the OSS audio API" ${UNIX_SYS})
 set_option(ALSA                "Support the ALSA audio API" ${UNIX_SYS})
 dep_option(ALSA_SHARED         "Dynamically load ALSA audio support" ON "ALSA" OFF)
+set_option(JACK                "Support the JACK audio API" ${UNIX_SYS})
+dep_option(JACK_SHARED         "Dynamically load JACK audio support" ON "JACK" OFF)
 set_option(ESD                 "Support the Enlightened Sound Daemon" ${UNIX_SYS})
 dep_option(ESD_SHARED          "Dynamically load ESD audio support" ON "ESD" OFF)
 set_option(PULSEAUDIO          "Use PulseAudio" ${UNIX_SYS})
@@ -895,6 +897,7 @@ elseif(UNIX AND NOT APPLE AND NOT ANDROID)
     endif()
     CheckOSS()
     CheckALSA()
+    CheckJACK()
     CheckPulseAudio()
     CheckESD()
     CheckARTS()

cmake/sdlchecks.cmake

@@ -158,6 +158,36 @@ macro(CheckPulseAudio)
   endif()
 endmacro()
 
+# Requires:
+# - PkgCheckModules
+# Optional:
+# - JACK_SHARED opt
+# - HAVE_DLOPEN opt
+macro(CheckJACK)
+  if(JACK)
+    pkg_check_modules(PKG_JACK jack)
+    if(PKG_JACK_FOUND)
+      set(HAVE_JACK TRUE)
+      file(GLOB JACK_SOURCES ${SDL2_SOURCE_DIR}/src/audio/jack/*.c)
+      set(SOURCE_FILES ${SOURCE_FILES} ${JACK_SOURCES})
+      set(SDL_AUDIO_DRIVER_JACK 1)
+      list(APPEND EXTRA_CFLAGS ${PKG_JACK_CFLAGS})
+      if(JACK_SHARED)
+        if(NOT HAVE_DLOPEN)
+          message_warn("You must have SDL_LoadObject() support for dynamic JACK audio loading")
+        else()
+          FindLibraryAndSONAME("jack")
+          set(SDL_AUDIO_DRIVER_JACK_DYNAMIC "\"${JACK_LIB_SONAME}\"")
+          set(HAVE_JACK_SHARED TRUE)
+        endif()
+      else()
+        list(APPEND EXTRA_LDFLAGS ${PKG_JACK_LDFLAGS})
+      endif()
+      set(HAVE_SDL_AUDIO TRUE)
+    endif()
+  endif()
+endmacro()
+
 # Requires:
 # - PkgCheckModules
 # Optional:

configure

@@ -658,10 +658,10 @@ X_PRE_LIBS
 X_CFLAGS
 XMKMF
 ARTSCONFIG
-PKG_CONFIG
 ESD_LIBS
 ESD_CFLAGS
 ESD_CONFIG
+PKG_CONFIG
 ALSA_LIBS
 ALSA_CFLAGS
 POW_LIB
@@ -806,6 +806,8 @@ with_alsa_prefix
 with_alsa_inc_prefix
 enable_alsatest
 enable_alsa_shared
+enable_jack
+enable_jack_shared
 enable_esd
 with_esd_prefix
 with_esd_exec_prefix
@@ -1535,6 +1537,8 @@ Optional Features:
   --enable-alsa           support the ALSA audio API [[default=yes]]
   --disable-alsatest      Do not try to compile and run a test Alsa program
   --enable-alsa-shared    dynamically load ALSA audio support [[default=yes]]
+  --enable-jack           use JACK audio [[default=yes]]
+  --enable-jack-shared    dynamically load JACK audio support [[default=yes]]
   --enable-esd            support the Enlightened Sound Daemon [[default=yes]]
   --disable-esdtest       Do not try to compile and run a test ESD program
   --enable-esd-shared     dynamically load ESD audio support [[default=yes]]
     fi
 }
 
+CheckJACK()
+{
+    # Check whether --enable-jack was given.
+if test "${enable_jack+set}" = set; then :
+  enableval=$enable_jack;
+else
+  enable_jack=yes
+fi
+
+    if test x$enable_audio = xyes -a x$enable_jack = xyes; then
+        audio_jack=no
+
+        JACK_REQUIRED_VERSION=0.125
+
+        # Extract the first word of "pkg-config", so it can be a program name with args.
+set dummy pkg-config; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_PKG_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $PKG_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_PKG_CONFIG="$PKG_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_PKG_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  test -z "$ac_cv_path_PKG_CONFIG" && ac_cv_path_PKG_CONFIG="no"
+  ;;
+esac
+fi
+PKG_CONFIG=$ac_cv_path_PKG_CONFIG
+if test -n "$PKG_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $PKG_CONFIG" >&5
+$as_echo "$PKG_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for JACK $JACK_REQUIRED_VERSION support" >&5
+$as_echo_n "checking for JACK $JACK_REQUIRED_VERSION support... " >&6; }
+        if test x$PKG_CONFIG != xno; then
+        if $PKG_CONFIG --atleast-pkgconfig-version 0.7 && $PKG_CONFIG --atleast-version $JACK_REQUIRED_VERSION jack; then
+                JACK_CFLAGS=`$PKG_CONFIG --cflags jack`
+                JACK_LIBS=`$PKG_CONFIG --libs jack`
+                audio_jack=yes
+            fi
+        fi
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: $audio_jack" >&5
+$as_echo "$audio_jack" >&6; }
+
+        if test x$audio_jack = xyes; then
+            # Check whether --enable-jack-shared was given.
+if test "${enable_jack_shared+set}" = set; then :
+  enableval=$enable_jack_shared;
+else
+  enable_jack_shared=yes
+fi
+
+            jack_lib=`find_lib "libjack.so.*" "$JACK_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`
+
+
+$as_echo "#define SDL_AUDIO_DRIVER_JACK 1" >>confdefs.h
+
+            SOURCES="$SOURCES $srcdir/src/audio/jack/*.c"
+            EXTRA_CFLAGS="$EXTRA_CFLAGS $JACK_CFLAGS"
+            if test x$have_loadso != xyes && \
+               test x$enable_jack_shared = xyes; then
+                { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: You must have SDL_LoadObject() support for dynamic JACK audio loading" >&5
+$as_echo "$as_me: WARNING: You must have SDL_LoadObject() support for dynamic JACK audio loading" >&2;}
+            fi
+            if test x$have_loadso = xyes && \
+               test x$enable_jack_shared = xyes && test x$jack_lib != x; then
+                echo "-- dynamic libjack -> $jack_lib"
+
+cat >>confdefs.h <<_ACEOF
+#define SDL_AUDIO_DRIVER_JACK_DYNAMIC "$jack_lib"
+_ACEOF
+
+                SUMMARY_audio="${SUMMARY_audio} jack(dynamic)"
+
+                case "$host" in
+                    # On Solaris, jack must be linked deferred explicitly
+                    # to prevent undefined symbol failures.
+                    *-*-solaris*)
+                        JACK_LIBS=`echo $JACK_LIBS | sed 's/\-l/-Wl,-l/g'`
+                        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-zdeferred $JACK_LIBS -Wl,-znodeferred"
+                esac
+            else
+                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $JACK_LIBS"
+                SUMMARY_audio="${SUMMARY_audio} jack"
+            fi
+            have_audio=yes
+        fi
+    fi
+}
+
 CheckESD()
 {
     # Check whether --enable-esd was given.
         CheckOSS
         CheckALSA
         CheckPulseAudio
+        CheckJACK
         CheckARTSC
         CheckESD
         CheckNAS

configure.in

@@ -839,6 +839,63 @@ AC_HELP_STRING([--enable-alsa-shared], [dynamically load ALSA audio support [[de
     fi
 }
 
+dnl Find JACK Audio
+CheckJACK()
+{
+    AC_ARG_ENABLE(jack,
+AC_HELP_STRING([--enable-jack], [use JACK audio [[default=yes]]]),
+                  , enable_jack=yes)
+    if test x$enable_audio = xyes -a x$enable_jack = xyes; then
+        audio_jack=no
+
+        JACK_REQUIRED_VERSION=0.125
+
+        AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
+        AC_MSG_CHECKING(for JACK $JACK_REQUIRED_VERSION support)
+        if test x$PKG_CONFIG != xno; then
+        if $PKG_CONFIG --atleast-pkgconfig-version 0.7 && $PKG_CONFIG --atleast-version $JACK_REQUIRED_VERSION jack; then
+                JACK_CFLAGS=`$PKG_CONFIG --cflags jack`
+                JACK_LIBS=`$PKG_CONFIG --libs jack`
+                audio_jack=yes
+            fi
+        fi
+        AC_MSG_RESULT($audio_jack)
+
+        if test x$audio_jack = xyes; then
+            AC_ARG_ENABLE(jack-shared,
+AC_HELP_STRING([--enable-jack-shared], [dynamically load JACK audio support [[default=yes]]]),
+                          , enable_jack_shared=yes)
+            jack_lib=[`find_lib "libjack.so.*" "$JACK_LIBS" | sed 's/.*\/\(.*\)/\1/; q'`]
+
+            AC_DEFINE(SDL_AUDIO_DRIVER_JACK, 1, [ ])
+            SOURCES="$SOURCES $srcdir/src/audio/jack/*.c"
+            EXTRA_CFLAGS="$EXTRA_CFLAGS $JACK_CFLAGS"
+            if test x$have_loadso != xyes && \
+               test x$enable_jack_shared = xyes; then
+                AC_MSG_WARN([You must have SDL_LoadObject() support for dynamic JACK audio loading])
+            fi
+            if test x$have_loadso = xyes && \
+               test x$enable_jack_shared = xyes && test x$jack_lib != x; then
+                echo "-- dynamic libjack -> $jack_lib"
+                AC_DEFINE_UNQUOTED(SDL_AUDIO_DRIVER_JACK_DYNAMIC, "$jack_lib", [ ])
+                SUMMARY_audio="${SUMMARY_audio} jack(dynamic)"
+
+                case "$host" in
+                    # On Solaris, jack must be linked deferred explicitly
+                    # to prevent undefined symbol failures.
+                    *-*-solaris*)
+                        JACK_LIBS=`echo $JACK_LIBS | sed 's/\-l/-Wl,-l/g'`
+                        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-zdeferred $JACK_LIBS -Wl,-znodeferred"
+                esac
+            else
+                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $JACK_LIBS"
+                SUMMARY_audio="${SUMMARY_audio} jack"
+            fi
+            have_audio=yes
+        fi
+    fi
+}
+
 dnl Find the ESD includes and libraries
 CheckESD()
 {
@@ -3035,6 +3092,7 @@ case "$host" in
         CheckOSS
         CheckALSA
         CheckPulseAudio
+        CheckJACK
         CheckARTSC
         CheckESD
         CheckNAS

include/SDL_config.h.cmake

@@ -205,6 +205,8 @@
 #cmakedefine SDL_AUDIO_DRIVER_ANDROID @SDL_AUDIO_DRIVER_ANDROID@
 #cmakedefine SDL_AUDIO_DRIVER_ALSA @SDL_AUDIO_DRIVER_ALSA@
 #cmakedefine SDL_AUDIO_DRIVER_ALSA_DYNAMIC @SDL_AUDIO_DRIVER_ALSA_DYNAMIC@
+#cmakedefine SDL_AUDIO_DRIVER_JACK @SDL_AUDIO_DRIVER_JACK@
+#cmakedefine SDL_AUDIO_DRIVER_JACK_DYNAMIC @SDL_AUDIO_DRIVER_JACK_DYNAMIC@
 #cmakedefine SDL_AUDIO_DRIVER_ARTS @SDL_AUDIO_DRIVER_ARTS@
 #cmakedefine SDL_AUDIO_DRIVER_ARTS_DYNAMIC @SDL_AUDIO_DRIVER_ARTS_DYNAMIC@
 #cmakedefine SDL_AUDIO_DRIVER_PULSEAUDIO @SDL_AUDIO_DRIVER_PULSEAUDIO@

include/SDL_config.h.in

@@ -204,6 +204,8 @@
 /* Enable various audio drivers */
 #undef SDL_AUDIO_DRIVER_ALSA
 #undef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
+#undef SDL_AUDIO_DRIVER_JACK
+#undef SDL_AUDIO_DRIVER_JACK_DYNAMIC
 #undef SDL_AUDIO_DRIVER_ARTS
 #undef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
 #undef SDL_AUDIO_DRIVER_PULSEAUDIO

src/audio/SDL_audio.c

@@ -101,6 +101,9 @@ static const AudioBootStrap *const bootstrap[] = {
 #if SDL_AUDIO_DRIVER_EMSCRIPTEN
     &EMSCRIPTENAUDIO_bootstrap,
 #endif
+#if SDL_AUDIO_DRIVER_JACK
+    &JACK_bootstrap,
+#endif
 #if SDL_AUDIO_DRIVER_DISK
     &DISKAUDIO_bootstrap,
 #endif
@@ -723,6 +726,7 @@ SDL_RunAudio(void *devicep)
     return 0;
 }
 
+/* !!! FIXME: this needs to deal with device spec changes. */
 /* The general capture thread function */
 static int SDLCALL
 SDL_CaptureAudio(void *devicep)

src/audio/SDL_sysaudio.h

@@ -182,6 +182,7 @@ typedef struct AudioBootStrap
 /* Not all of these are available in a given build. Use #ifdefs, etc. */
 extern AudioBootStrap PULSEAUDIO_bootstrap;
 extern AudioBootStrap ALSA_bootstrap;
+extern AudioBootStrap JACK_bootstrap;
 extern AudioBootStrap SNDIO_bootstrap;
 extern AudioBootStrap NETBSDAUDIO_bootstrap;
 extern AudioBootStrap DSP_bootstrap;