virtual-surround-sink: Use FFTW3 instead of naive approach

This replaces the original virtual surround sink with a total
rewrite, aiming to implement any number of hrir use cases,
including asymmetrical impulses as two separate left and right
output files. It uses FFTW3 FFT convolution, using the overlap-
save method, with full rewind support. It operates in steps
equal to the resampled length of the hrir, and overlaps input
blocks in increments equal to the size of the FFT block. If
using paired hrirs, it requires matched sample spec and sample
rates and channel maps. For best results, the input files should
have speaker maps, rather than expecting the sample loader to
auto detect the mapping.

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/240>

src/Makefile.am

@@ -1268,7 +1268,6 @@ modlibexec_LTLIBRARIES += \
 		module-loopback.la \
 		module-virtual-sink.la \
 		module-virtual-source.la \
-		module-virtual-surround-sink.la \
 		module-switch-on-connect.la \
 		module-switch-on-port-available.la \
 		module-filter-apply.la \
@@ -1530,6 +1529,11 @@ endif
 endif
 endif
 
+if HAVE_FFTW
+modlibexec_LTLIBRARIES += \
+		module-virtual-surround-sink.la
+endif
+
 if HAVE_DBUS
 if HAVE_FFTW
 modlibexec_LTLIBRARIES += \
@@ -1775,9 +1779,9 @@ module_virtual_source_la_LDFLAGS = $(MODULE_LDFLAGS)
 module_virtual_source_la_LIBADD = $(MODULE_LIBADD)
 
 module_virtual_surround_sink_la_SOURCES = modules/module-virtual-surround-sink.c
-module_virtual_surround_sink_la_CFLAGS = $(AM_CFLAGS) $(SERVER_CFLAGS) -DPA_MODULE_NAME=module_virtual_surround_sink
+module_virtual_surround_sink_la_CFLAGS = $(AM_CFLAGS) $(SERVER_CFLAGS) $(FFTW_CFLAGS) -DPA_MODULE_NAME=module_virtual_surround_sink
 module_virtual_surround_sink_la_LDFLAGS = $(MODULE_LDFLAGS)
-module_virtual_surround_sink_la_LIBADD = $(MODULE_LIBADD)
+module_virtual_surround_sink_la_LIBADD = $(MODULE_LIBADD) $(FFTW_LIBS)
 
 # X11
 

src/modules/meson.build

@@ -61,7 +61,6 @@ all_modules = [
   [ 'module-tunnel-source-new', 'module-tunnel-source-new.c' ],
   [ 'module-virtual-sink', 'module-virtual-sink.c' ],
   [ 'module-virtual-source', 'module-virtual-source.c' ],
-  [ 'module-virtual-surround-sink', 'module-virtual-surround-sink.c' ],
   [ 'module-volume-restore', 'module-volume-restore.c' ],
 #  [ 'module-waveout', 'module-waveout.c' ],
 ]
@@ -137,6 +136,12 @@ if dbus_dep.found()
   ]
 endif
 
+if fftw_dep.found()
+  all_modules += [
+    [ 'module-virtual-surround-sink', 'module-virtual-surround-sink.c', [], [], [fftw_dep, libm_dep] ],
+  ]
+endif
+
 if dbus_dep.found() and fftw_dep.found()
   all_modules += [
     [ 'module-equalizer-sink', 'module-equalizer-sink.c', [], [], [dbus_dep, fftw_dep, libm_dep] ],