add unit test for sample cache

test/CMakeLists.txt

@@ -0,0 +1,10 @@
+
+project(fluidsynth-test)
+
+
+ADD_EXECUTABLE(test_sfont_cache test_sfont_cache.cpp)
+TARGET_LINK_LIBRARIES(test_sfont_cache libfluidsynth)
+ADD_TEST(NAME test_sfont_cache COMMAND test_sfont_cache)
+
+# make test only runs tests, but doesnt build them
+add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND}  DEPENDS test_sfont_cache)

test/test.h

@@ -0,0 +1,11 @@
+
+#pragma once
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define TEST_ASSERT(COND) if (!(COND)) { fprintf(stderr, __FILE__ ":%d assertion ("#COND") failed\n", __LINE__); exit(-1); }
+
+#define TEST_ASSERT_EQ(LHS, RHS) TEST_ASSERT((LHS) == (RHS))
+#define TEST_ASSERT_NEQ(LHS, RHS) TEST_ASSERT((LHS) != (RHS))
+#define TEST_SUCCESS(FLUID_FUNCT) TEST_ASSERT_NEQ((FLUID_FUNCT), FLUID_FAILED)

test/test_sample_cache.c

@@ -0,0 +1,46 @@
+
+#include "test.h"
+#include "fluidsynth.h" // use local fluidsynth header
+
+
+// this test aims to make sure that sample data used by multiple synths is not freed
+// once unloaded by its parent synth
+int main()
+{
+    enum { FRAMES = 1024 };
+    float buf[FRAMES * 2];
+    
+    fluid_settings_t *settings = new_fluid_settings();
+    fluid_synth_t *synth1 = new_fluid_synth(settings),
+                  *synth2 = new_fluid_synth(settings);
+    
+    TEST_ASSERT_NEQ(settings, NULL);
+    TEST_ASSERT_NEQ(synth1, NULL);
+    TEST_ASSERT_NEQ(synth2, NULL);
+    
+    char *s;
+    TEST_SUCCESS(fluid_settings_dupstr(settings, "synth.default-soundfont", &s))
+        
+    TEST_ASSERT_NEQ(s[0], '\0');
+    
+    // load a sfont to synth1
+    TEST_SUCCESS(fluid_synth_sfload(synth1, s, 1));
+    
+    // load the same font to synth2 and start a note
+    TEST_SUCCESS(fluid_synth_sfload(synth2, s, 1));
+    TEST_SUCCESS(fluid_synth_noteon(synth2, 0, 60, 127));
+        
+    // render some audio
+    TEST_SUCCESS(fluid_synth_write_float(synth2, FRAMES, buf, 0, 2, buf, 1, 2));
+    
+    // delete the synth that owns the soundfont
+    delete_fluid_synth(synth1);
+    
+    // render again with the unloaded sfont and hope no segfault happens
+    TEST_SUCCESS(fluid_synth_write_float(synth2, FRAMES, buf, 0, 2, buf, 1, 2));
+        
+    delete_fluid_synth(synth2);
+    delete_fluid_settings(settings);
+    
+    return EXIT_SUCCESS;
+}