configure, meson: move audio driver detection to Meson

This brings a change that makes audio drivers more similar to all
other modules.  All drivers are built by default, while
--audio-drv-list only governs the default choice of the audio driver.

Meson options are added to disable the drivers, and the next patches
will fix the help messages and command line options, and especially
make the non-default drivers available via -audiodev.

Cc: Gerd Hoffman <kraxel@redhat.com>
Cc: Volker Rümelin <vr_qemu@t-online.de>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20211007130630.632028-4-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

4 files changed, 148 insertions, 216 deletions

diff --git a/audio/meson.build b/audio/meson.build
index 9a95c58f18..462533bb8c 100644
--- a/audio/meson.build
+++ b/audio/meson.build
@@ -7,23 +7,22 @@ softmmu_ss.add(files(
   'wavcapture.c',
 ))
 
-softmmu_ss.add(when: [coreaudio, 'CONFIG_AUDIO_COREAUDIO'], if_true: files('coreaudio.c'))
-softmmu_ss.add(when: [dsound, 'CONFIG_AUDIO_DSOUND'],
-               if_true: files('dsoundaudio.c', 'audio_win_int.c'))
+softmmu_ss.add(when: coreaudio, if_true: files('coreaudio.c'))
+softmmu_ss.add(when: dsound, if_true: files('dsoundaudio.c', 'audio_win_int.c'))
 
 audio_modules = {}
 foreach m : [
-  ['CONFIG_AUDIO_ALSA', 'alsa', alsa, 'alsaaudio.c'],
-  ['CONFIG_AUDIO_OSS', 'oss', oss, 'ossaudio.c'],
-  ['CONFIG_AUDIO_PA', 'pa', pulse, 'paaudio.c'],
-  ['CONFIG_AUDIO_SDL', 'sdl', sdl, 'sdlaudio.c'],
-  ['CONFIG_AUDIO_JACK', 'jack', jack, 'jackaudio.c'],
-  ['CONFIG_SPICE', 'spice', spice, 'spiceaudio.c']
+  ['alsa', alsa, files('alsaaudio.c')],
+  ['oss', oss, files('ossaudio.c')],
+  ['pa', pulse, files('paaudio.c')],
+  ['sdl', sdl, files('sdlaudio.c')],
+  ['jack', jack, files('jackaudio.c')],
+  ['spice', spice, files('spiceaudio.c')]
 ]
-  if config_host.has_key(m[0])
+  if m[1].found()
     module_ss = ss.source_set()
-    module_ss.add(when: m[2], if_true: files(m[3]))
-    audio_modules += {m[1] : module_ss}
+    module_ss.add(m[1], m[2])
+    audio_modules += {m[0] : module_ss}
   endif
 endforeach
 
diff --git a/configure b/configure
index 174fa84b60..b9a457a02f 100755
--- a/configure
+++ b/configure
@@ -240,7 +240,7 @@ interp_prefix="/usr/gnemul/qemu-%M"
 static="no"
 cross_compile="no"
 cross_prefix=""
-audio_drv_list=""
+audio_drv_list="default"
 block_drv_rw_whitelist=""
 block_drv_ro_whitelist=""
 block_drv_whitelist_tools="no"
@@ -299,7 +299,6 @@ fdt="auto"
 netmap="no"
 sdl="auto"
 sdl_image="auto"
-coreaudio="auto"
 virtiofsd="auto"
 virtfs="auto"
 libudev="auto"
@@ -356,7 +355,6 @@ module_upgrades="no"
 prefix="/usr/local"
 qemu_suffix="qemu"
 slirp="auto"
-oss_lib=""
 bsd="no"
 linux="no"
 solaris="no"
@@ -703,54 +701,35 @@ fi
 case $targetos in
 MINGW32*)
   mingw32="yes"
-  audio_possible_drivers="dsound sdl"
-  if check_include dsound.h; then
-    audio_drv_list="dsound"
-  else
-    audio_drv_list=""
-  fi
   supported_os="yes"
   plugins="no"
   pie="no"
 ;;
 GNU/kFreeBSD)
   bsd="yes"
-  audio_drv_list="oss try-sdl"
-  audio_possible_drivers="oss sdl pa"
 ;;
 FreeBSD)
   bsd="yes"
   bsd_user="yes"
   make="${MAKE-gmake}"
-  audio_drv_list="oss try-sdl"
-  audio_possible_drivers="oss sdl pa"
   # needed for kinfo_getvmmap(3) in libutil.h
   netmap=""  # enable netmap autodetect
 ;;
 DragonFly)
   bsd="yes"
   make="${MAKE-gmake}"
-  audio_drv_list="oss try-sdl"
-  audio_possible_drivers="oss sdl pa"
 ;;
 NetBSD)
   bsd="yes"
   make="${MAKE-gmake}"
-  audio_drv_list="oss try-sdl"
-  audio_possible_drivers="oss sdl"
-  oss_lib="-lossaudio"
 ;;
 OpenBSD)
   bsd="yes"
   make="${MAKE-gmake}"
-  audio_drv_list="try-sdl"
-  audio_possible_drivers="sdl"
 ;;
 Darwin)
   bsd="yes"
   darwin="yes"
-  audio_drv_list="try-coreaudio try-sdl"
-  audio_possible_drivers="coreaudio sdl"
   # Disable attempts to use ObjectiveC features in os/object.h since they
   # won't work when we're compiling with gcc as a C compiler.
   QEMU_CFLAGS="-DOS_OBJECT_USE_OBJC=0 $QEMU_CFLAGS"
@@ -759,10 +738,6 @@ SunOS)
   solaris="yes"
   make="${MAKE-gmake}"
   smbd="${SMBD-/usr/sfw/sbin/smbd}"
-  if test -f /usr/include/sys/soundcard.h ; then
-    audio_drv_list="oss try-sdl"
-  fi
-  audio_possible_drivers="oss sdl"
 # needed for CMSG_ macros in sys/socket.h
   QEMU_CFLAGS="-D_XOPEN_SOURCE=600 $QEMU_CFLAGS"
 # needed for TIOCWIN* defines in termios.h
@@ -774,8 +749,6 @@ Haiku)
   QEMU_CFLAGS="-DB_USE_POSITIVE_POSIX_ERRORS -D_BSD_SOURCE -fPIC $QEMU_CFLAGS"
 ;;
 Linux)
-  audio_drv_list="try-pa oss"
-  audio_possible_drivers="oss alsa sdl pa"
   linux="yes"
   linux_user="yes"
   vhost_user=${default_feature:-yes}
@@ -1796,8 +1769,7 @@ Advanced options (experts only):
   --disable-strip          disable stripping binaries
   --disable-werror         disable compilation abort on warning
   --disable-stack-protector disable compiler-provided stack protection
-  --audio-drv-list=LIST    set audio drivers list:
-                           Available drivers: $audio_possible_drivers
+  --audio-drv-list=LIST    set audio drivers list
   --block-drv-whitelist=L  Same as --block-drv-rw-whitelist=L
   --block-drv-rw-whitelist=L
                            set block driver read-write whitelist
@@ -2401,12 +2373,6 @@ if test -z "$want_tools"; then
 fi
 
 ##########################################
-# Disable features only meaningful for system-mode emulation
-if test "$softmmu" = "no"; then
-    audio_drv_list=""
-fi
-
-##########################################
 # L2TPV3 probe
 
 cat > $TMPC <<EOF
@@ -2985,130 +2951,6 @@ EOF
 fi
 
 ##########################################
-# detect CoreAudio
-if test "$coreaudio" != "no" ; then
-  coreaudio_libs="-framework CoreAudio"
-  cat > $TMPC << EOF
-#include <CoreAudio/CoreAudio.h>
-int main(void)
-{
-  return (int)AudioGetCurrentHostTime();
-}
-EOF
-  if compile_prog "" "$coreaudio_libs" ; then
-    coreaudio=yes
-  else
-    coreaudio=no
-  fi
-fi
-
-##########################################
-# Sound support libraries probe
-
-audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/,/ /g')
-for drv in $audio_drv_list; do
-    case $drv in
-    alsa | try-alsa)
-    if $pkg_config alsa --exists; then
-        alsa_libs=$($pkg_config alsa --libs)
-        alsa_cflags=$($pkg_config alsa --cflags)
-        alsa=yes
-        if test "$drv" = "try-alsa"; then
-            audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-alsa/alsa/')
-        fi
-    else
-        if test "$drv" = "try-alsa"; then
-            audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-alsa//')
-        else
-            error_exit "$drv check failed" \
-                "Make sure to have the $drv libs and headers installed."
-        fi
-    fi
-    ;;
-
-    pa | try-pa)
-    if $pkg_config libpulse --exists; then
-        libpulse=yes
-        pulse_libs=$($pkg_config libpulse --libs)
-        pulse_cflags=$($pkg_config libpulse --cflags)
-        if test "$drv" = "try-pa"; then
-            audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-pa/pa/')
-        fi
-    else
-        if test "$drv" = "try-pa"; then
-            audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-pa//')
-        else
-            error_exit "$drv check failed" \
-                "Make sure to have the $drv libs and headers installed."
-        fi
-    fi
-    ;;
-
-    sdl)
-    if test "$sdl" = "no"; then
-        error_exit "sdl not found or disabled, can not use sdl audio driver"
-    fi
-    ;;
-
-    try-sdl)
-    if test "$sdl" = "no"; then
-        audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-sdl//')
-    else
-        audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-sdl/sdl/')
-    fi
-    ;;
-
-    coreaudio | try-coreaudio)
-    if test "$coreaudio" = "no"; then
-      if test "$drv" = "try-coreaudio"; then
-        audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-coreaudio//')
-      else
-        error_exit "$drv check failed" \
-                "Make sure to have the $drv is available."
-      fi
-    else
-      coreaudio_libs="-framework CoreAudio"
-      if test "$drv" = "try-coreaudio"; then
-        audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-coreaudio/coreaudio/')
-      fi
-    fi
-    ;;
-
-    dsound)
-      dsound_libs="-lole32 -ldxguid"
-    ;;
-
-    oss)
-      oss_libs="$oss_lib"
-    ;;
-
-    jack | try-jack)
-    if $pkg_config jack --exists; then
-        libjack=yes
-        jack_libs=$($pkg_config jack --libs)
-        if test "$drv" = "try-jack"; then
-            audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-jack/jack/')
-        fi
-    else
-        if test "$drv" = "try-jack"; then
-            audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-jack//')
-        else
-            error_exit "$drv check failed" \
-                "Make sure to have the $drv libs and headers installed."
-        fi
-    fi
-    ;;
-
-    *)
-    echo "$audio_possible_drivers" | grep -q "\<$drv\>" || {
-        error_exit "Unknown driver '$drv' selected" \
-            "Possible drivers are: $audio_possible_drivers"
-    }
-    ;;
-    esac
-done
-
-##########################################
 # plugin linker support probe
 
 if test "$plugins" != "no"; then
@@ -4538,28 +4380,6 @@ fi
 if test "$gprof" = "yes" ; then
   echo "CONFIG_GPROF=y" >> $config_host_mak
 fi
-echo "CONFIG_AUDIO_DRIVERS=$audio_drv_list" >> $config_host_mak
-for drv in $audio_drv_list; do
-    def=CONFIG_AUDIO_$(echo $drv | LC_ALL=C tr '[a-z]' '[A-Z]')
-    echo "$def=y" >> $config_host_mak
-done
-if test "$alsa" = "yes" ; then
-    echo "CONFIG_ALSA=y" >> $config_host_mak
-fi
-echo "ALSA_LIBS=$alsa_libs" >> $config_host_mak
-echo "ALSA_CFLAGS=$alsa_cflags" >> $config_host_mak
-if test "$libpulse" = "yes" ; then
-    echo "CONFIG_LIBPULSE=y" >> $config_host_mak
-fi
-echo "PULSE_LIBS=$pulse_libs" >> $config_host_mak
-echo "PULSE_CFLAGS=$pulse_cflags" >> $config_host_mak
-echo "COREAUDIO_LIBS=$coreaudio_libs" >> $config_host_mak
-echo "DSOUND_LIBS=$dsound_libs" >> $config_host_mak
-echo "OSS_LIBS=$oss_libs" >> $config_host_mak
-if test "$libjack" = "yes" ; then
-    echo "CONFIG_LIBJACK=y" >> $config_host_mak
-fi
-echo "JACK_LIBS=$jack_libs" >> $config_host_mak
 echo "CONFIG_BDRV_RW_WHITELIST=$block_drv_rw_whitelist" >> $config_host_mak
 echo "CONFIG_BDRV_RO_WHITELIST=$block_drv_ro_whitelist" >> $config_host_mak
 if test "$block_drv_whitelist_tools" = "yes" ; then
@@ -5197,7 +5017,7 @@ if test "$skip_meson" = no; then
         -Dvhost_user_blk_server=$vhost_user_blk_server -Dmultiprocess=$multiprocess \
         -Dfuse=$fuse -Dfuse_lseek=$fuse_lseek -Dguest_agent_msi=$guest_agent_msi -Dbpf=$bpf\
         $(if test "$default_feature" = no; then echo "-Dauto_features=disabled"; fi) \
-	-Dtcg_interpreter=$tcg_interpreter \
+        -Daudio_drv_list=$audio_drv_list -Dtcg_interpreter=$tcg_interpreter \
         $cross_arg \
         "$PWD" "$source_path"
 
diff --git a/meson.build b/meson.build
index c1314baace..90d1b7ab61 100644
--- a/meson.build
+++ b/meson.build
@@ -428,20 +428,23 @@ vde = not_found
 if config_host.has_key('CONFIG_VDE')
   vde = declare_dependency(link_args: config_host['VDE_LIBS'].split())
 endif
+
 pulse = not_found
-if 'CONFIG_LIBPULSE' in config_host
-  pulse = declare_dependency(compile_args: config_host['PULSE_CFLAGS'].split(),
-                             link_args: config_host['PULSE_LIBS'].split())
+if not get_option('pa').auto() or (targetos == 'linux' and have_system)
+  pulse = dependency('libpulse', required: get_option('pa'),
+                     method: 'pkg-config', kwargs: static_kwargs)
 endif
 alsa = not_found
-if 'CONFIG_ALSA' in config_host
-  alsa = declare_dependency(compile_args: config_host['ALSA_CFLAGS'].split(),
-                            link_args: config_host['ALSA_LIBS'].split())
+if not get_option('alsa').auto() or (targetos == 'linux' and have_system)
+  alsa = dependency('alsa', required: get_option('alsa'),
+                    method: 'pkg-config', kwargs: static_kwargs)
 endif
 jack = not_found
-if 'CONFIG_LIBJACK' in config_host
-  jack = declare_dependency(link_args: config_host['JACK_LIBS'].split())
+if not get_option('jack').auto() or have_system
+  jack = dependency('jack', required: get_option('jack'),
+                    method: 'pkg-config', kwargs: static_kwargs)
 endif
+
 spice = not_found
 spice_headers = not_found
 spice_protocol = not_found
@@ -801,16 +804,59 @@ if liblzfse.found() and not cc.links('''
 endif
 
 oss = not_found
-if 'CONFIG_AUDIO_OSS' in config_host
-  oss = declare_dependency(link_args: config_host['OSS_LIBS'].split())
+if not get_option('oss').auto() or have_system
+  if not cc.has_header('sys/soundcard.h')
+    # not found
+  elif targetos == 'netbsd'
+    oss = cc.find_library('ossaudio', required: get_option('oss'),
+                          kwargs: static_kwargs)
+  else
+    oss = declare_dependency()
+  endif
+
+  if not oss.found()
+    if get_option('oss').enabled()
+      error('OSS not found')
+    else
+      warning('OSS not found, disabling')
+    endif
+  endif
 endif
 dsound = not_found
-if 'CONFIG_AUDIO_DSOUND' in config_host
-  dsound = declare_dependency(link_args: config_host['DSOUND_LIBS'].split())
+if not get_option('dsound').auto() or (targetos == 'windows' and have_system)
+  if cc.has_header('dsound.h')
+    dsound = declare_dependency(link_args: ['-lole32', '-ldxguid'])
+  endif
+
+  if not dsound.found()
+    if get_option('dsound').enabled()
+      error('DirectSound not found')
+    else
+      warning('DirectSound not found, disabling')
+    endif
+  endif
 endif
+
 coreaudio = not_found
-if 'CONFIG_AUDIO_COREAUDIO' in config_host
-  coreaudio = declare_dependency(link_args: config_host['COREAUDIO_LIBS'].split())
+if not get_option('coreaudio').auto() or (targetos == 'darwin' and have_system)
+  coreaudio = dependency('appleframeworks', modules: 'CoreAudio',
+                         required: get_option('coreaudio'))
+  if coreaudio.found() and not cc.links('''
+    #include <CoreAudio/CoreAudio.h>
+    int main(void)
+    {
+      return (int)AudioGetCurrentHostTime();
+    }''')
+    coreaudio = not_found
+  endif
+
+  if not coreaudio.found()
+    if get_option('coreaudio').enabled()
+      error('CoreAudio not found')
+    else
+      warning('CoreAudio not found, disabling')
+    endif
+  endif
 endif
 
 opengl = not_found
@@ -1156,6 +1202,49 @@ if libbpf.found() and not cc.links('''
   endif
 endif
 
+#################
+# config-host.h #
+#################
+
+audio_drivers_selected = []
+if have_system
+  audio_drivers_available = {
+    'alsa': alsa.found(),
+    'coreaudio': coreaudio.found(),
+    'dsound': dsound.found(),
+    'jack': jack.found(),
+    'oss': oss.found(),
+    'pa': pulse.found(),
+    'sdl': sdl.found(),
+  }
+
+  # Default to native drivers first, OSS second, SDL third
+  audio_drivers_priority = \
+    [ 'pa', 'coreaudio', 'dsound', 'oss' ] + \
+    (targetos == 'linux' ? [] : [ 'sdl' ])
+  audio_drivers_default = []
+  foreach k: audio_drivers_priority
+    if audio_drivers_available[k]
+      audio_drivers_default += k
+    endif
+  endforeach
+
+  foreach k: get_option('audio_drv_list')
+    if k == 'default'
+      audio_drivers_selected += audio_drivers_default
+    elif not audio_drivers_available[k]
+      error('Audio driver "@0@" not available.'.format(k))
+    else
+      audio_drivers_selected += k
+    endif
+  endforeach
+endif
+foreach k: audio_drivers_selected
+  config_host_data.set('CONFIG_AUDIO_' + k.to_upper(), true)
+endforeach
+config_host_data.set('CONFIG_AUDIO_DRIVERS',
+                     '"' + '", "'.join(audio_drivers_selected) + '", ')
+
 if get_option('cfi')
   cfi_flags=[]
   # Check for dependency on LTO
@@ -1199,10 +1288,6 @@ endif
 have_host_block_device = (targetos != 'darwin' or
     cc.has_header('IOKit/storage/IOMedia.h'))
 
-#################
-# config-host.h #
-#################
-
 have_virtfs = (targetos == 'linux' and
     have_system and
     libattr.found() and
@@ -1446,7 +1531,7 @@ config_host_data.set('HAVE_BROKEN_SIZE_MAX', not cc.compiles('''
 
 
 ignored = ['CONFIG_QEMU_INTERP_PREFIX'] # actually per-target
-arrays = ['CONFIG_AUDIO_DRIVERS', 'CONFIG_BDRV_RW_WHITELIST', 'CONFIG_BDRV_RO_WHITELIST']
+arrays = ['CONFIG_BDRV_RW_WHITELIST', 'CONFIG_BDRV_RO_WHITELIST']
 strings = ['HOST_DSOSUF', 'CONFIG_IASL']
 foreach k, v: config_host
   if ignored.contains(k)
@@ -2880,7 +2965,7 @@ if config_host.has_key('CONFIG_MODULES')
 endif
 summary_info += {'fuzzing support':   config_host.has_key('CONFIG_FUZZ')}
 if have_system
-  summary_info += {'Audio drivers':     config_host['CONFIG_AUDIO_DRIVERS']}
+  summary_info += {'Audio drivers':     ' '.join(audio_drivers_selected)}
 endif
 summary_info += {'Trace backends':    config_host['TRACE_BACKENDS']}
 if config_host['TRACE_BACKENDS'].split().contains('simple')
@@ -3068,6 +3153,18 @@ if vnc.found()
   summary_info += {'VNC JPEG support':  jpeg}
   summary_info += {'VNC PNG support':   png}
 endif
+if targetos not in ['darwin', 'haiku', 'windows']
+  summary_info += {'OSS support':     oss}
+elif targetos == 'darwin'
+  summary_info += {'CoreAudio support': coreaudio}
+elif targetos == 'windows'
+  summary_info += {'DirectSound support': dsound}
+endif
+if targetos == 'linux'
+  summary_info += {'ALSA support':    alsa}
+  summary_info += {'PulseAudio support': pulse}
+endif
+summary_info += {'JACK support':      jack}
 summary_info += {'brlapi support':    brlapi}
 summary_info += {'vde support':       config_host.has_key('CONFIG_VDE')}
 summary_info += {'netmap support':    config_host.has_key('CONFIG_NETMAP')}
diff --git a/meson_options.txt b/meson_options.txt
index 2c89e79e8b..052c4f088e 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -6,9 +6,12 @@ option('qemu_firmwarepath', type : 'string', value : '',
        description: 'search PATH for firmware files')
 option('sphinx_build', type : 'string', value : '',
        description: 'Use specified sphinx-build [$sphinx_build] for building document (default to be empty)')
-
 option('default_devices', type : 'boolean', value : true,
        description: 'Include a default selection of devices in emulators')
+option('audio_drv_list', type: 'array', value: ['default'],
+       choices: ['alsa', 'coreaudio', 'default', 'dsound', 'jack', 'oss', 'pa', 'sdl'],
+       description: 'Set audio driver list')
+
 option('docs', type : 'feature', value : 'auto',
        description: 'Documentations build support')
 option('gettext', type : 'feature', value : 'auto',
@@ -139,6 +142,19 @@ option('fuse', type: 'feature', value: 'auto',
 option('fuse_lseek', type : 'feature', value : 'auto',
        description: 'SEEK_HOLE/SEEK_DATA support for FUSE exports')
 
+option('alsa', type: 'feature', value: 'auto',
+       description: 'ALSA sound support')
+option('coreaudio', type: 'feature', value: 'auto',
+       description: 'CoreAudio sound support')
+option('dsound', type: 'feature', value: 'auto',
+       description: 'DirectSound sound support')
+option('jack', type: 'feature', value: 'auto',
+       description: 'JACK sound support')
+option('oss', type: 'feature', value: 'auto',
+       description: 'OSS sound support')
+option('pa', type: 'feature', value: 'auto',
+       description: 'PulseAudio sound support')
+
 option('vhost_user_blk_server', type: 'feature', value: 'auto',
        description: 'build vhost-user-blk server')
 option('virtfs', type: 'feature', value: 'auto',