From dd4146e302b63fb7782fb0cd878c40497b20a42f Mon Sep 17 00:00:00 2001
From: twinaphex <libretro@gmail.com>
Date: Sun, 14 May 2017 23:12:10 +0200
Subject: [PATCH] Try to write initial implementation of audio mixer task

---
 libretro-common/audio/audio_mixer.c         |   4 +-
 libretro-common/include/audio/audio_mixer.h |   4 +-
 tasks/task_audio_mixer.c                    | 173 ++++++++++++++++++++
 tasks/task_file_transfer.c                  |   5 +
 4 files changed, 182 insertions(+), 4 deletions(-)

diff --git a/libretro-common/audio/audio_mixer.c b/libretro-common/audio/audio_mixer.c
index bcc373e487..61a71cdfee 100644
--- a/libretro-common/audio/audio_mixer.c
+++ b/libretro-common/audio/audio_mixer.c
@@ -242,7 +242,7 @@ void audio_mixer_done(void)
       s_voices[i].type = AUDIO_MIXER_TYPE_NONE;
 }
 
-audio_mixer_sound_t* audio_mixer_load_wav(const char* path, void *buffer, int32_t size)
+audio_mixer_sound_t* audio_mixer_load_wav(void *buffer, int32_t size)
 {
    /* WAV data */
    rwav_t wav;
@@ -289,7 +289,7 @@ audio_mixer_sound_t* audio_mixer_load_wav(const char* path, void *buffer, int32_
    return sound;
 }
 
-audio_mixer_sound_t* audio_mixer_load_ogg(const char* path, void *buffer, int32_t size)
+audio_mixer_sound_t* audio_mixer_load_ogg(void *buffer, int32_t size)
 {
 #ifdef HAVE_STB_VORBIS
    audio_mixer_sound_t* sound = (audio_mixer_sound_t*)calloc(1, sizeof(*sound));
diff --git a/libretro-common/include/audio/audio_mixer.h b/libretro-common/include/audio/audio_mixer.h
index 7f372eccbc..a011abbe5d 100644
--- a/libretro-common/include/audio/audio_mixer.h
+++ b/libretro-common/include/audio/audio_mixer.h
@@ -46,8 +46,8 @@ void audio_mixer_init(unsigned rate);
 
 void audio_mixer_done(void);
 
-audio_mixer_sound_t* audio_mixer_load_wav(const char* path, void *buffer, int32_t size);
-audio_mixer_sound_t* audio_mixer_load_ogg(const char* path, void *buffer, int32_t size);
+audio_mixer_sound_t* audio_mixer_load_wav(void *buffer, int32_t size);
+audio_mixer_sound_t* audio_mixer_load_ogg(void *buffer, int32_t size);
 
 void audio_mixer_destroy(audio_mixer_sound_t* sound);
 
diff --git a/tasks/task_audio_mixer.c b/tasks/task_audio_mixer.c
index da01be2801..93e36e3505 100644
--- a/tasks/task_audio_mixer.c
+++ b/tasks/task_audio_mixer.c
@@ -14,3 +14,176 @@
  */
 
 #include "tasks_internal.h"
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <file/nbio.h>
+#include <audio/audio_mixer.h>
+#include <compat/strl.h>
+#include <retro_miscellaneous.h>
+
+#include "../file_path_special.h"
+#include "../verbosity.h"
+
+#include "tasks_internal.h"
+
+struct nbio_audio_mixer_handle
+{
+   enum nbio_type type;
+   bool is_finished;
+   void *handle;
+};
+
+static void task_audio_mixer_cleanup(nbio_handle_t *nbio)
+{
+   struct nbio_audio_mixer_handle *image = (struct nbio_audio_mixer_handle*)nbio->data;
+
+   if (nbio->data)
+      free(nbio->data);
+   nbio_free(nbio->handle);
+   nbio->data        = NULL;
+   nbio->handle      = NULL;
+}
+
+static void task_audio_mixer_load_free(retro_task_t *task)
+{
+   nbio_handle_t       *nbio  = task ? (nbio_handle_t*)task->state : NULL;
+
+   if (nbio)
+   {
+      task_audio_mixer_cleanup(nbio);
+      free(nbio);
+   }
+}
+
+static int cb_nbio_audio_wav_loaded(void *data, size_t len)
+{
+   void *ptr                       = NULL;
+   nbio_handle_t *nbio             = (nbio_handle_t*)data; 
+   struct nbio_audio_mixer_handle *image = nbio ? 
+      (struct nbio_audio_mixer_handle*)nbio->data : NULL;
+   audio_mixer_sound_t *audmix     = NULL;
+
+   ptr                             = nbio_get_ptr(nbio->handle, &len);
+   audmix                          = audio_mixer_load_wav(ptr, len);
+
+   if (!audmix ||
+       !audio_mixer_play(audmix, true, 0.0f, NULL)
+      )
+   {
+      task_audio_mixer_cleanup(nbio);
+      return -1;
+   }
+
+   image->is_finished              = true;
+   nbio->is_finished               = true;
+
+   return 0;
+}
+
+static int cb_nbio_audio_ogg_loaded(void *data, size_t len)
+{
+   void *ptr                       = NULL;
+   nbio_handle_t *nbio             = (nbio_handle_t*)data; 
+   struct nbio_audio_mixer_handle 
+      *image                       = nbio ? 
+      (struct nbio_audio_mixer_handle*)nbio->data : NULL;
+   audio_mixer_sound_t *audmix     = NULL;
+
+   ptr                             = nbio_get_ptr(nbio->handle, &len);
+   audmix                          = audio_mixer_load_ogg(ptr, len);
+
+   if (!audmix ||
+       !audio_mixer_play(audmix, true, 0.0f, NULL)
+      )
+   {
+      task_audio_mixer_cleanup(nbio);
+      return -1;
+   }
+
+
+   image->is_finished              = true;
+   nbio->is_finished               = true;
+
+   return 0;
+}
+
+bool task_audio_mixer_load_handler(retro_task_t *task)
+{
+   unsigned i;
+   nbio_handle_t            *nbio  = (nbio_handle_t*)task->state;
+   struct nbio_audio_mixer_handle *image = (struct nbio_audio_mixer_handle*)nbio->data;
+
+   if (     nbio->is_finished
+         && (image && image->is_finished )
+         && (!task_get_cancelled(task)))
+      return false;
+
+   return true;
+}
+
+bool task_push_audio_mixer_load(const char *fullpath, retro_task_callback_t cb, void *user_data)
+{
+   nbio_handle_t             *nbio   = NULL;
+   struct nbio_audio_mixer_handle   *image = NULL;
+   retro_task_t                   *t = (retro_task_t*)calloc(1, sizeof(*t));
+
+   if (!t)
+      goto error_msg;
+
+   nbio = (nbio_handle_t*)calloc(1, sizeof(*nbio));
+
+   if (!nbio)
+      goto error;
+
+   strlcpy(nbio->path, fullpath, sizeof(nbio->path));
+
+   image              = (struct nbio_audio_mixer_handle*)calloc(1, sizeof(*image));   
+   if (!image)
+      goto error;
+
+   nbio->type         = NBIO_TYPE_NONE;
+   image->type        = NBIO_TYPE_NONE;
+
+   if (strstr(fullpath, file_path_str(FILE_PATH_WAV_EXTENSION)))
+   {
+      nbio->type      = NBIO_TYPE_WAV;
+      image->type     = NBIO_TYPE_WAV;
+      nbio->cb        = &cb_nbio_audio_wav_loaded;
+   }
+   else if (strstr(fullpath, file_path_str(FILE_PATH_OGG_EXTENSION)))
+   {
+      nbio->type      = NBIO_TYPE_OGG;
+      image->type     = NBIO_TYPE_OGG;
+      nbio->cb        = &cb_nbio_audio_ogg_loaded;
+   }
+
+   nbio->data         = (struct nbio_audio_mixer_handle*)image;
+   nbio->is_finished  = false;
+   nbio->status       = NBIO_STATUS_INIT;
+
+   t->state           = nbio;
+   t->handler         = task_file_load_handler;
+   t->cleanup         = task_audio_mixer_load_free;
+   t->callback        = cb;
+   t->user_data       = user_data;
+
+   task_queue_push(t);
+
+   return true;
+
+error:
+   task_audio_mixer_load_free(t);
+   free(t);
+   if (nbio)
+      free(nbio);
+
+error_msg:
+   RARCH_ERR("[audio mixer load] Failed to open '%s': %s.\n",
+         fullpath, strerror(errno));
+
+   return false;
+}
diff --git a/tasks/task_file_transfer.c b/tasks/task_file_transfer.c
index bb0a6bf52c..8da9f2e793 100644
--- a/tasks/task_file_transfer.c
+++ b/tasks/task_file_transfer.c
@@ -111,6 +111,11 @@ void task_file_load_handler(retro_task_t *task)
             if (!task_image_load_handler(task))
                task_set_finished(task, true);
             break;
+         case NBIO_TYPE_OGG:
+         case NBIO_TYPE_WAV:
+            if (!task_audio_mixer_load_handler(task))
+               task_set_finished(task, true);
+            break;
          case NBIO_TYPE_NONE:
          default:
             if (nbio->is_finished)