Resolve playback issues for Soundfonts not using zero padding samples (#1487)

Soundfonts that do not have at least 46 zero-samples at the end of each sample may not sound correctly when `synth.dynamic-sample-loading` is active.

* Add debug output about discovered samples
* Add test cases for dynamic-sample loading
* Do not advance sample endpoint

Author: derselbst

Diff for: src/sfloader/fluid_defsfont.c

@@ -317,25 +317,9 @@ const char *fluid_defsfont_get_name(fluid_defsfont_t *defsfont)
 int fluid_defsfont_load_sampledata(fluid_defsfont_t *defsfont, SFData *sfdata, fluid_sample_t *sample)
 {
     int num_samples;
-    unsigned int source_end = sample->source_end;
-
-    /* For uncompressed samples we want to include the 46 zero sample word area following each sample
-     * in the Soundfont. Otherwise samples with loopend > end, which we have decided not to correct, would
-     * be corrected after all in fluid_sample_sanitize_loop */
-    if(!(sample->sampletype & FLUID_SAMPLETYPE_OGG_VORBIS))
-    {
-        source_end += 46;  /* Length of zero sample word after each sample, according to SF specs */
-
-        /* Safeguard against Soundfonts that are not quite valid and don't include 46 sample words after the
-         * last sample */
-        if(source_end >= (defsfont->samplesize  / sizeof(short)))
-        {
-            source_end = defsfont->samplesize  / sizeof(short);
-        }
-    }
 
     num_samples = fluid_samplecache_load(
-                      sfdata, sample->source_start, source_end, sample->sampletype,
+                      sfdata, sample->source_start, sample->source_end, sample->sampletype,
                       defsfont->mlock, &sample->data, &sample->data24);
 
     if(num_samples < 0)
@@ -2097,6 +2081,8 @@ fluid_sample_import_sfont(fluid_sample_t *sample, SFSample *sfsample, fluid_defs
         sample->notify = dynamic_samples_sample_notify;
     }
 
+    FLUID_LOG(FLUID_DBG, "Discovering sample '%s', src_start %d, loop_start %d, loop_end %d, src_end %d", sample->name, sample->source_start, sample->loopstart, sample->loopend, sample->source_end);
+
     if(fluid_sample_validate(sample, defsfont->samplesize) == FLUID_FAILED)
     {
         return FLUID_FAILED;

Diff for: test/CMakeLists.txt

@@ -58,6 +58,7 @@ else()
     set(REVERB_RENDER_DIR "${CMAKE_CURRENT_BINARY_DIR}/manual/reverb")
     set(EXCL_RENDER_DIR "${CMAKE_CURRENT_BINARY_DIR}/manual/exclusive_class")
     set(DSPINTERP_RENDER_DIR "${CMAKE_CURRENT_BINARY_DIR}/manual/dsp_interp")
+    set(DYNSAM_RENDER_DIR "${CMAKE_CURRENT_BINARY_DIR}/manual/dynamic-sample-loading")
 
     if(LIBSNDFILE_SUPPORT)
       set(FEXT "wav")
@@ -69,7 +70,7 @@ else()
     add_custom_target(check_manual)
 
     add_custom_target(create_iir_dir
-        COMMAND ${CMAKE_COMMAND} -E make_directory ${IIR_FILTER_RENDER_DIR} ${AWE32_NRPN_RENDER_DIR} ${SFSPEC_RENDER_DIR} ${PORTAMENTO_RENDER_DIR} ${REVERB_RENDER_DIR} ${EXCL_RENDER_DIR} ${DSPINTERP_RENDER_DIR}
+        COMMAND ${CMAKE_COMMAND} -E make_directory ${IIR_FILTER_RENDER_DIR} ${AWE32_NRPN_RENDER_DIR} ${SFSPEC_RENDER_DIR} ${PORTAMENTO_RENDER_DIR} ${REVERB_RENDER_DIR} ${EXCL_RENDER_DIR} ${DSPINTERP_RENDER_DIR} ${DYNSAM_RENDER_DIR}
         VERBATIM)
 
     add_custom_target(render1415
@@ -219,6 +220,15 @@ else()
         VERBATIM
     )
 
+    add_custom_target(render1484
+        COMMAND fluidsynth -R 0 -C 0 -g 0.6 -o synth.dynamic-sample-loading=1 -F "${DYNSAM_RENDER_DIR}/dynamic-sample-loading_on.${FEXT}" "dynamic-sample-loading_test.mid" "DrTebz.sf2"
+        COMMAND fluidsynth -R 0 -C 0 -g 0.6 -o synth.dynamic-sample-loading=0 -F "${DYNSAM_RENDER_DIR}/dynamic-sample-loading_off.${FEXT}" "dynamic-sample-loading_test.mid" "DrTebz.sf2"
+        COMMENT "Rendering dynamic sample loading test"
+        DEPENDS fluidsynth create_iir_dir
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/manual/dynamic-sample-loading/
+        VERBATIM
+    )
+
     # Add a dependency so that rendering targets depends on check_manual
     add_dependencies(check_manual render1415)
     add_dependencies(check_manual render1417)
@@ -233,5 +243,8 @@ else()
     add_dependencies(check_manual render1455)
     add_dependencies(check_manual renderDK64JJU)
     add_dependencies(check_manual renderExcl)
+    add_dependencies(check_manual rendere1m1)
+    add_dependencies(check_manual renderdspInterp)
+    add_dependencies(check_manual render1484)
 
 endif()