Fix PulseAudio freeze (#17316)

* Fix freeze when close app/content after stopping/restarting
  pulse service
* Fix pa->devicelist memleak
* Logging improvements

audio/drivers/alsa.c

@@ -254,10 +254,8 @@ void alsa_device_list_free(void *data, void *array_list_data)
 {
    struct string_list *s = (struct string_list*)array_list_data;
 
-   if (!s)
-      return;
-
-   string_list_free(s);
+   if (s)
+      string_list_free(s);
 }
 
 audio_driver_t audio_alsa = {

audio/drivers/pipewire.c

@@ -132,11 +132,15 @@ static void stream_state_changed_cb(void *data,
 
    switch(state)
    {
+      case PW_STREAM_STATE_ERROR:
+         RARCH_ERR("[PipeWire]: Stream error\n");
+         pw_thread_loop_signal(audio->pw->thread_loop, false);
+         break;
       case PW_STREAM_STATE_UNCONNECTED:
+         RARCH_WARN("[PipeWire]: Stream unconnected\n");
          pw_thread_loop_stop(audio->pw->thread_loop);
          break;
       case PW_STREAM_STATE_STREAMING:
-      case PW_STREAM_STATE_ERROR:
       case PW_STREAM_STATE_PAUSED:
          pw_thread_loop_signal(audio->pw->thread_loop, false);
          break;
@@ -192,7 +196,8 @@ static void registry_event_global(void *data, uint32_t id,
       media = spa_dict_lookup(props, PW_KEY_MEDIA_CLASS);
       if (media && strcmp(media, "Audio/Sink") == 0)
       {
-         if ((sink = spa_dict_lookup(props, PW_KEY_NODE_NAME)) != NULL)
+         sink = spa_dict_lookup(props, PW_KEY_NODE_NAME);
+         if (sink && pw->devicelist)
          {
             attr.i = id;
             string_list_append(pw->devicelist, sink, attr);
@@ -231,11 +236,9 @@ static void *pipewire_init(const char *device, unsigned rate,
 
    if (!audio)
       goto error;
-   pw = audio->pw = (pipewire_core_t*)calloc(1, sizeof(*audio->pw));
 
+   pw = audio->pw = (pipewire_core_t*)calloc(1, sizeof(*audio->pw));
    pw->devicelist = string_list_new();
-   if (!pw->devicelist)
-      goto error;
 
    if (!pipewire_core_init(pw, "audio_driver"))
       goto error;
@@ -445,7 +448,7 @@ static void *pipewire_device_list_new(void *data)
 {
    pipewire_audio_t *audio = (pipewire_audio_t*)data;
 
-   if (audio && audio->pw->devicelist)
+   if (audio && audio->pw && audio->pw->devicelist)
       return string_list_clone(audio->pw->devicelist);
 
    return NULL;

audio/drivers/pulse.c

@@ -37,6 +37,7 @@ typedef struct
    bool nonblock;
    bool success;
    bool is_paused;
+   bool is_ready;
    struct string_list *devicelist;
 } pa_t;
 
@@ -65,6 +66,9 @@ static void pulse_free(void *data)
    if (pa->mainloop)
       pa_threaded_mainloop_free(pa->mainloop);
 
+   if (pa->devicelist)
+      string_list_free(pa->devicelist);
+
    free(pa);
 }
 
@@ -83,8 +87,15 @@ static void context_state_cb(pa_context *c, void *data)
    switch (pa_context_get_state(c))
    {
       case PA_CONTEXT_READY:
-      case PA_CONTEXT_TERMINATED:
+         pa_threaded_mainloop_signal(pa->mainloop, 0);
+         break;
       case PA_CONTEXT_FAILED:
+         RARCH_ERR("[PulseAudio]: Connection failed\n");
+         pa->is_ready = false;
+         pa_threaded_mainloop_signal(pa->mainloop, 0);
+         break;
+      case PA_CONTEXT_TERMINATED:
+         pa->is_ready = false;
          pa_threaded_mainloop_signal(pa->mainloop, 0);
          break;
       default:
@@ -98,9 +109,7 @@ static void pa_sinklist_cb(pa_context *c, const pa_sink_info *l, int eol, void *
    attr.i = 0;
    pa_t *pa = (pa_t*)data;
 
-   if (!pa->devicelist)
-      pa->devicelist = string_list_new();
-   if (!pa->devicelist)
+   if (!pa || !pa->devicelist)
       return;
 
    /* If EOL is set to a positive number,
@@ -119,8 +128,13 @@ static void stream_state_cb(pa_stream *s, void *data)
    switch (pa_stream_get_state(s))
    {
       case PA_STREAM_READY:
+         pa->is_ready = true;
+         pa_threaded_mainloop_signal(pa->mainloop, 0);
+         break;
+      case PA_STREAM_UNCONNECTED:
       case PA_STREAM_FAILED:
       case PA_STREAM_TERMINATED:
+         pa->is_ready = false;
          pa_threaded_mainloop_signal(pa->mainloop, 0);
          break;
       default:
@@ -180,6 +194,8 @@ static void *pulse_init(const char *device, unsigned rate,
    if (!pa)
       goto error;
 
+   pa->devicelist = string_list_new();
+
    pa->mainloop = pa_threaded_mainloop_new();
    if (!pa->mainloop)
       goto error;
@@ -203,7 +219,7 @@ static void *pulse_init(const char *device, unsigned rate,
    if (pa_context_get_state(pa->context) != PA_CONTEXT_READY)
       goto unlock_error;
 
-   pa_context_get_sink_info_list(pa->context,pa_sinklist_cb,pa);
+   pa_context_get_sink_info_list(pa->context, pa_sinklist_cb, pa);
    /* Checking device against sink list would be tricky due to callback, so it is just set. */
    if (device)
      pa_context_set_default_sink(pa->context, device, NULL, NULL);
@@ -249,6 +265,7 @@ static void *pulse_init(const char *device, unsigned rate,
       pa->buffer_size = buffer_attr.tlength;
 
    pa_threaded_mainloop_unlock(pa->mainloop);
+   pa->is_ready = true;
 
    return pa;
 
@@ -272,6 +289,9 @@ static ssize_t pulse_write(void *data, const void *buf_, size_t size)
       if (!pulse_start(pa, false))
          return -1;
 
+   if (!pa->is_ready)
+      return 0;
+
    pa_threaded_mainloop_lock(pa->mainloop);
    while (size)
    {
@@ -299,11 +319,12 @@ static bool pulse_stop(void *data)
 {
    bool ret;
    pa_t *pa = (pa_t*)data;
+
+   if (!pa->is_ready)
+      return false;
    if (pa->is_paused)
       return true;
 
-   RARCH_LOG("[PulseAudio]: Pausing.\n");
-
    pa->success = true; /* In case of spurious wakeup. Not critical. */
    pa_threaded_mainloop_lock(pa->mainloop);
    pa_stream_cork(pa->stream, true, stream_success_cb, pa);
@@ -318,7 +339,7 @@ static bool pulse_alive(void *data)
 {
    pa_t *pa = (pa_t*)data;
 
-   if (!pa)
+   if (!pa || !pa->is_ready)
       return false;
    return !pa->is_paused;
 }
@@ -327,11 +348,12 @@ static bool pulse_start(void *data, bool is_shutdown)
 {
    bool ret;
    pa_t *pa = (pa_t*)data;
+
+   if (!pa->is_ready)
+      return false;
    if (!pa->is_paused)
       return true;
 
-   RARCH_LOG("[PulseAudio]: Unpausing.\n");
-
    pa->success = true; /* In case of spurious wakeup. Not critical. */
    pa_threaded_mainloop_lock(pa->mainloop);
    pa_stream_cork(pa->stream, false, stream_success_cb, pa);
@@ -360,6 +382,9 @@ static size_t pulse_write_avail(void *data)
    size_t _len;
    pa_t *pa = (pa_t*)data;
 
+   if (!pa->is_ready)
+      return 0;
+
    pa_threaded_mainloop_lock(pa->mainloop);
    _len = pa_stream_writable_size(pa->stream);
 
@@ -377,13 +402,11 @@ static size_t pulse_buffer_size(void *data)
 static void *pulse_device_list_new(void *data)
 {
    pa_t *pa = (pa_t*)data;
-   if (!pa)
-      return NULL;
 
-   struct string_list *s = pa->devicelist ? string_list_clone(pa->devicelist) : NULL;
-   if (!s)
-      return NULL;
-   return s;
+   if (pa && pa->devicelist)
+      return string_list_clone(pa->devicelist);
+
+   return NULL;
 }
 
 static void pulse_device_list_free(void *data, void *array_list_data)