meson: fix compilation when spa-plugins is disabled

Fixes #3811

src/modules/meson.build

@@ -69,6 +69,11 @@ pipewire_module_loopback = shared_library('pipewire-module-loopback',
   dependencies : [spa_dep, mathlib, dl_lib, pipewire_dep],
 )
 
+plugin_dependencies = []
+if get_option('spa-plugins').allowed()
+  plugin_dependencies += audioconvert_dep
+endif
+
 simd_cargs = []
 simd_dependencies = []
 
@@ -122,7 +127,7 @@ filter_chain_sources = [
   'module-filter-chain/convolver.c'
 ]
 filter_chain_dependencies = [
-  mathlib, dl_lib, pipewire_dep, sndfile_dep, audioconvert_dep
+  mathlib, dl_lib, pipewire_dep, sndfile_dep, plugin_dependencies
 ]
 
 pipewire_module_filter_chain = shared_library('pipewire-module-filter-chain',
@@ -175,7 +180,7 @@ pipewire_module_echo_cancel = shared_library('pipewire-module-echo-cancel',
   install : true,
   install_dir : modules_install_dir,
   install_rpath: modules_install_dir,
-  dependencies : [mathlib, dl_lib, pipewire_dep, audioconvert_dep],
+  dependencies : [mathlib, dl_lib, pipewire_dep, plugin_dependencies],
 )
 
 build_module_jack_tunnel = jack_dep.found()

src/modules/module-echo-cancel.c

@@ -249,6 +249,7 @@ static inline void aec_run(struct impl *impl, const float *rec[], const float *p
 {
 	spa_audio_aec_run(impl->aec, rec, play, out, n_samples);
 
+#ifdef HAVE_SPA_PLUGINS
 	if (SPA_UNLIKELY(impl->wav_path[0])) {
 		if (impl->wav_file == NULL) {
 			struct wav_file_info info;
@@ -287,6 +288,7 @@ static inline void aec_run(struct impl *impl, const float *rec[], const float *p
 		wav_file_close(impl->wav_file);
 		impl->wav_file = NULL;
 	}
+#endif
 }
 
 static void process(struct impl *impl)

src/modules/module-filter-chain/builtin_plugin.c

@@ -784,6 +784,7 @@ static float *create_dirac(const char *filename, float gain, int delay, int offs
 static float *resample_buffer(float *samples, int *n_samples,
 		unsigned long in_rate, unsigned long out_rate, uint32_t quality)
 {
+#ifdef HAVE_SPA_PLUGINS
 	uint32_t in_len, out_len, total_out = 0;
 	int out_n_samples;
 	float *out_samples, *out_buf, *in_buf;
@@ -849,6 +850,12 @@ error:
 	free(samples);
 	free(out_samples);
 	return NULL;
+#else
+	pw_log_error("compiled without spa-plugins support, can't resample");
+	float *out_samples = calloc(*n_samples, sizeof(float));
+	memcpy(out_samples, samples, *n_samples * sizeof(float));
+	return out_samples;
+#endif
 }
 
 static void * convolver_instantiate(const struct fc_descriptor * Descriptor,