Rewrite overflow so that an extra rvoice is used, and make sure samples are ref/dref under mutex.

fluidsynth/src/rvoice/fluid_rvoice.c

@@ -648,13 +648,8 @@ void fluid_rvoice_set_samplemode(fluid_rvoice_t* voice, enum fluid_loop value)
 void 
 fluid_rvoice_set_sample(fluid_rvoice_t* voice, fluid_sample_t* value)
 {
-  if (voice->dsp.sample) {
-    fluid_sample_decr_ref(voice->dsp.sample);
-    voice->dsp.sample = NULL;
-  }
-  if (value) {
   voice->dsp.sample = value;
-    fluid_sample_incr_ref(voice->dsp.sample);
+  if (value) {
     voice->dsp.check_sample_sanity_flag |= FLUID_SAMPLESANITY_STARTUP;
   }
 }
@@ -664,10 +659,6 @@ fluid_rvoice_voiceoff(fluid_rvoice_t* voice)
 {
   fluid_adsr_env_set_section(&voice->envlfo.volenv, FLUID_VOICE_ENVFINISHED);
   fluid_adsr_env_set_section(&voice->envlfo.modenv, FLUID_VOICE_ENVFINISHED);
-  if (voice->dsp.sample) {
-    fluid_sample_decr_ref(voice->dsp.sample);
-    voice->dsp.sample = NULL;
-  }
 }
 
 

fluidsynth/src/rvoice/fluid_rvoice_mixer.c

@@ -309,7 +309,7 @@ fluid_mixer_buffers_render_one(fluid_mixer_buffers_t* buffers,
     fluid_finish_rvoice(buffers, voice);
   }
 }
-
+/*
 static int fluid_mixer_buffers_replace_voice(fluid_mixer_buffers_t* buffers, 
 			                      fluid_rvoice_t* voice)
 {
@@ -325,35 +325,35 @@ static int fluid_mixer_buffers_replace_voice(fluid_mixer_buffers_t* buffers,
   fvc = buffers->finished_voice_count;
   return retval;  
 }
+*/
 
 int 
 fluid_rvoice_mixer_add_voice(fluid_rvoice_mixer_t* mixer, fluid_rvoice_t* voice)
 {
-  // Check if this voice is already in array, this can happen in some overflow conditions
-  int i, j=0;
-  for (i=0; i < mixer->active_voices; i++) {
-    if (mixer->rvoices[i] == voice) 
-      j++;
-  }
-  
-  if (j > 0) {
-    // It's already present, make sure it won't get deleted right away
-#ifdef ENABLE_MIXER_THREADS  
-    for (i=0; i < mixer->thread_count; i++)
-      fluid_mixer_buffers_replace_voice(&mixer->threads[i], voice);
-#endif
-    fluid_mixer_buffers_replace_voice(&mixer->buffers, voice);
-    return FLUID_OK;
-  }
-
- 
-  if (mixer->active_voices >= mixer->polyphony) {
-    FLUID_LOG(FLUID_WARN, "Trying to exceed polyphony in fluid_rvoice_mixer_add_voice");
-    return FLUID_FAILED;
-  }
+  int i;
 
+  if (mixer->active_voices < mixer->polyphony) {
     mixer->rvoices[mixer->active_voices++] = voice;
     return FLUID_OK;
+  }
+  
+  /* See if any voices just finished, if so, take its place.
+     This can happen in voice overflow conditions. */
+  for (i=0; i < mixer->active_voices; i++) {
+    if (mixer->rvoices[i] == voice) {
+      FLUID_LOG(FLUID_ERR, "Internal error: Trying to replace an existing rvoice in fluid_rvoice_mixer_add_voice?!");
+      return FLUID_FAILED;
+    }
+    if (mixer->rvoices[i]->envlfo.volenv.section == FLUID_VOICE_ENVFINISHED) {
+      fluid_finish_rvoice(&mixer->buffers, mixer->rvoices[i]);
+      mixer->rvoices[i] = voice;
+      return FLUID_OK;
+    }
+  }
+
+  /* This should never happen */
+  FLUID_LOG(FLUID_ERR, "Trying to exceed polyphony in fluid_rvoice_mixer_add_voice");
+  return FLUID_FAILED;
 }
 
 static int 

fluidsynth/src/synth/fluid_synth.c

@@ -2734,10 +2734,16 @@ fluid_synth_check_finished_voices(fluid_synth_t* synth)
   fluid_rvoice_t* fv;
   
   while (NULL != (fv = fluid_rvoice_eventhandler_get_finished_voice(synth->eventhandler))) {
-    for (j=0; j < synth->polyphony; j++) 
+    for (j=0; j < synth->polyphony; j++) {
       if (synth->voice[j]->rvoice == fv) {
         fluid_voice_unlock_rvoice(synth->voice[j]);
         fluid_voice_off(synth->voice[j]);
+        break;
+      }
+      else if (synth->voice[j]->overflow_rvoice == fv) {
+        fluid_voice_overflow_rvoice_finished(synth->voice[j]);
+        break;
+      }
     }
   }
 }
@@ -2821,7 +2827,7 @@ static fluid_voice_t*
 fluid_synth_free_voice_by_kill_LOCAL(fluid_synth_t* synth)
 {
   int i;
-  fluid_real_t best_prio = 999999.;
+  fluid_real_t best_prio = OVERFLOW_PRIO_CANNOT_KILL-1;
   fluid_real_t this_voice_prio;
   fluid_voice_t* voice;
   int best_voice_index=-1;

fluidsynth/src/synth/fluid_voice.c

@@ -134,6 +134,14 @@ fluid_voice_update_modenv(fluid_voice_t* voice,
 			    coeff, increment, min, max);
 }
 
+static inline void fluid_sample_null_ptr(fluid_sample_t** sample)
+{
+  if (*sample != NULL) {
+    fluid_sample_decr_ref(*sample);
+    *sample = NULL;
+  }
+}
+
 /*
  * new_fluid_voice
  */
@@ -147,13 +155,17 @@ new_fluid_voice(fluid_real_t output_rate)
     return NULL;
   }
   voice->rvoice = FLUID_NEW(fluid_rvoice_t);
-  if (voice->rvoice == NULL) {
+  voice->overflow_rvoice = FLUID_NEW(fluid_rvoice_t);
+  if (voice->rvoice == NULL || voice->overflow_rvoice == NULL) {
     FLUID_LOG(FLUID_ERR, "Out of memory");
+    FLUID_FREE(voice->rvoice);
     FLUID_FREE(voice);
     return NULL;
   }
   FLUID_MEMSET(voice->rvoice, 0, sizeof(fluid_rvoice_t));
+  FLUID_MEMSET(voice->overflow_rvoice, 0, sizeof(fluid_rvoice_t));
   voice->can_access_rvoice = 1; 
+  voice->can_access_overflow_rvoice = 1; 
 
   voice->status = FLUID_VOICE_CLEAN;
   voice->chan = NO_CHANNEL;
@@ -161,8 +173,7 @@ new_fluid_voice(fluid_real_t output_rate)
   voice->vel = 0;
   voice->channel = NULL;
   voice->sample = NULL;
-  voice->output_rate = output_rate;
-  UPDATE_RVOICE_R1(fluid_rvoice_set_output_rate, output_rate);
+  fluid_voice_set_output_rate(voice, output_rate);
 
   /* The 'sustain' and 'finished' segments of the volume / modulation
    * envelope are constant. They are never affected by any modulator
@@ -190,15 +201,29 @@ delete_fluid_voice(fluid_voice_t* voice)
   if (voice == NULL) {
     return FLUID_OK;
   }
-  if (!voice->can_access_rvoice) {
+  if (!voice->can_access_rvoice || !voice->can_access_overflow_rvoice) {
     /* stop rvoice before deleting voice! */
     return FLUID_FAILED;
   }
+  FLUID_FREE(voice->overflow_rvoice);
   FLUID_FREE(voice->rvoice);
   FLUID_FREE(voice);
   return FLUID_OK;
 }
 
+/*
+ * Swaps the current rvoice with the current overflow_rvoice
+ */
+static void fluid_voice_swap_rvoice(fluid_voice_t* voice)
+{
+  fluid_rvoice_t* rtemp = voice->rvoice;
+  int ctemp = voice->can_access_rvoice;
+  voice->rvoice = voice->overflow_rvoice;
+  voice->can_access_rvoice = voice->can_access_overflow_rvoice;
+  voice->overflow_rvoice = rtemp;
+  voice->can_access_overflow_rvoice = ctemp;
+}
+
 /* fluid_voice_init
  *
  * Initialize the synthesis process
@@ -214,6 +239,16 @@ fluid_voice_init(fluid_voice_t* voice, fluid_sample_t* sample,
    * of IIR filters, position in sample etc) is initialized. */
   int i;
 
+  if (!voice->can_access_rvoice) {
+    if (voice->can_access_overflow_rvoice) 
+      fluid_voice_swap_rvoice(voice);
+    else {
+      FLUID_LOG(FLUID_ERR, "Internal error: Cannot access an rvoice in fluid_voice_init!");
+      return FLUID_FAILED;
+    }
+  }
+  /* We are now guaranteed to have access to the rvoice */
+
   if (voice->sample)
     fluid_voice_off(voice);
 
@@ -223,12 +258,18 @@ fluid_voice_init(fluid_voice_t* voice, fluid_sample_t* sample,
   voice->vel = (unsigned char) vel;
   voice->channel = channel;
   voice->mod_count = 0;
-  voice->sample = sample;
   voice->start_time = start_time;
   voice->debug = 0;
   voice->has_noteoff = 0;
   UPDATE_RVOICE0(fluid_rvoice_reset);
+
+  /* Increment the reference count of the sample to prevent the
+     unloading of the soundfont while this voice is playing,
+     once for us and once for the rvoice. */
+  fluid_sample_incr_ref(sample);
   UPDATE_RVOICE_PTR(fluid_rvoice_set_sample, sample);
+  fluid_sample_incr_ref(sample);
+  voice->sample = sample;
 
   i = fluid_channel_get_interp_method(channel);
   UPDATE_RVOICE_I1(fluid_rvoice_set_interp_method, i);
@@ -257,10 +298,6 @@ fluid_voice_init(fluid_voice_t* voice, fluid_sample_t* sample,
   UPDATE_RVOICE_BUFFERS2(fluid_rvoice_buffers_set_mapping, 0, i);
   UPDATE_RVOICE_BUFFERS2(fluid_rvoice_buffers_set_mapping, 1, i+1);
 
-  /* Increment the reference count of the sample to prevent the
-     unloading of the soundfont while this voice is playing. */
-  fluid_sample_incr_ref(voice->sample);
-
   return FLUID_OK;
 }
 
@@ -277,6 +314,11 @@ fluid_voice_set_output_rate(fluid_voice_t* voice, fluid_real_t value)
   
   voice->output_rate = value;
   UPDATE_RVOICE_R1(fluid_rvoice_set_output_rate, value);
+  /* Update the other rvoice as well */
+  fluid_voice_swap_rvoice(voice);
+  UPDATE_RVOICE_R1(fluid_rvoice_set_output_rate, value);
+  fluid_voice_swap_rvoice(voice);
+
   return FLUID_FAILED;
 }
 
@@ -1191,6 +1233,16 @@ fluid_voice_kill_excl(fluid_voice_t* voice){
   return FLUID_OK;
 }
 
+/*
+ * Called by fluid_synth when the overflow rvoice can be reclaimed. 
+ */
+void fluid_voice_overflow_rvoice_finished(fluid_voice_t* voice)
+{
+  voice->can_access_overflow_rvoice = 1;
+  fluid_sample_null_ptr(&voice->overflow_rvoice->dsp.sample);
+}
+
+
 /*
  * fluid_voice_off
  *
@@ -1206,14 +1258,14 @@ fluid_voice_off(fluid_voice_t* voice)
   voice->chan = NO_CHANNEL;
   UPDATE_RVOICE0(fluid_rvoice_voiceoff);
   
+  if (voice->can_access_rvoice)
+    fluid_sample_null_ptr(&voice->rvoice->dsp.sample);
+
   voice->status = FLUID_VOICE_OFF;
   voice->has_noteoff = 1;
 
   /* Decrement the reference count of the sample. */
-  if (voice->sample) {
-    fluid_sample_decr_ref(voice->sample);
-    voice->sample = NULL;
-  }
+  fluid_sample_null_ptr(&voice->sample);
 
   /* Decrement voice count */
   voice->channel->synth->active_voice_count--;
@@ -1489,6 +1541,11 @@ fluid_voice_get_overflow_prio(fluid_voice_t* voice,
 {
   fluid_real_t this_voice_prio = 0;
 
+  /* Are we already overflowing? */
+  if (!voice->can_access_overflow_rvoice) {
+    return OVERFLOW_PRIO_CANNOT_KILL;
+  }
+
   /* Is this voice on the drum channel?
    * Then it is very important.
    * Also skip the released and sustained scores.

fluidsynth/src/synth/fluid_voice.h

@@ -101,7 +101,9 @@ struct _fluid_voice_t
 
 	/* rvoice control */
 	fluid_rvoice_t* rvoice;
+	fluid_rvoice_t* overflow_rvoice; /* Used temporarily and only in overflow situations */
 	int can_access_rvoice; /* False if rvoice is being rendered in separate thread */ 
+	int can_access_overflow_rvoice; /* False if overflow_rvoice is being rendered in separate thread */ 
 
 	/* for debugging */
 	int debug;
@@ -142,6 +144,7 @@ void fluid_voice_update_param(fluid_voice_t* voice, int gen);
 
 int fluid_voice_noteoff(fluid_voice_t* voice);
 int fluid_voice_off(fluid_voice_t* voice);
+void fluid_voice_overflow_rvoice_finished(fluid_voice_t* voice);
 void fluid_voice_mix (fluid_voice_t *voice, int count, fluid_real_t* dsp_buf,
 		 fluid_real_t* left_buf, fluid_real_t* right_buf,
 		 fluid_real_t* reverb_buf, fluid_real_t* chorus_buf);
@@ -151,6 +154,8 @@ fluid_real_t fluid_voice_get_overflow_prio(fluid_voice_t* voice,
 					    fluid_overflow_prio_t* score,
 					    unsigned int cur_time);
 
+#define OVERFLOW_PRIO_CANNOT_KILL 999999.
+
 /**
  * Locks the rvoice for rendering, so it can't be modified directly
  */