SWITCH: add audio support

CMakeLists.switch

@@ -25,8 +25,7 @@ set(SRC_DIRS
         src
         src/atomic
         src/audio
-        #src/audio/switch
-        src/audio/dummy
+        src/audio/switch
         src/cpuinfo
         src/events
         src/file

configure.ac

@@ -4235,8 +4235,6 @@ AS_HELP_STRING([--enable-render-d3d], [enable the Direct3D render driver [[defau
         EXTRA_CFLAGS="$EXTRA_CFLAGS -isystem${DEVKITPRO}/libnx/include -I${DEVKITPRO}/portlibs/switch/include -D__SWITCH__=1"
         EXTRA_CFLAGS="$EXTRA_CFLAGS -g -O2 -march=armv8-a -mtune=cortex-a57 -mtp=soft -fPIC -ftls-model=local-exec"
         CheckDeclarationAfterStatement
-        CheckDiskAudio
-        CheckDummyAudio
 
         # Set up files for the video library
         if test x$enable_video = xyes; then

src/audio/SDL_audio.c

@@ -101,6 +101,9 @@ static const AudioBootStrap *const bootstrap[] = {
 #if SDL_AUDIO_DRIVER_EMSCRIPTEN
     &EMSCRIPTENAUDIO_bootstrap,
 #endif
+#if SDL_AUDIO_DRIVER_SWITCH
+    &SWITCHAUDIO_bootstrap,
+#endif
 #if SDL_AUDIO_DRIVER_JACK
     &JACK_bootstrap,
 #endif

src/audio/SDL_sysaudio.h

@@ -208,6 +208,7 @@ extern AudioBootStrap ANDROIDAUDIO_bootstrap;
 extern AudioBootStrap PSPAUDIO_bootstrap;
 extern AudioBootStrap EMSCRIPTENAUDIO_bootstrap;
 extern AudioBootStrap OS2AUDIO_bootstrap;
+extern AudioBootStrap SWITCHAUDIO_bootstrap;
 
 #endif /* SDL_sysaudio_h_ */
 

src/audio/switch/SDL_switchaudio.c

@@ -0,0 +1,148 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_AUDIO_DRIVER_SWITCH
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <malloc.h>
+
+#include "SDL_audio.h"
+#include "../SDL_audio_c.h"
+#include "../SDL_audiodev_c.h"
+
+#include "SDL_switchaudio.h"
+
+static int
+SWITCHAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
+{
+    Result res = audoutInitialize();
+    if (res != 0) {
+        return SDL_SetError("audoutInitialize failed (0x%x)", res);
+    }
+
+    res = audoutStartAudioOut();
+    if (res != 0) {
+        audoutExit();
+        return SDL_SetError("audoutStartAudioOut failed (0x%x)", res);
+    }
+
+    this->hidden = (struct SDL_PrivateAudioData *) SDL_malloc(sizeof(*this->hidden));
+    if (this->hidden == NULL) {
+        return SDL_OutOfMemory();
+    }
+    SDL_zerop(this->hidden);
+
+    switch (this->spec.format & 0xff) {
+        case 8:
+        case 16:
+            this->spec.format = AUDIO_S16LSB;
+            break;
+        default:
+            return SDL_SetError("Unsupported audio format");
+    }
+
+    this->spec.freq = 48000;
+    this->spec.channels = 2;
+
+    SDL_CalculateAudioSpec(&this->spec);
+
+    for (int i = 0; i < 2; i++) {
+        u32 size = (u32) (this->spec.size + 0xfff) & ~0xfff;
+        this->hidden->buffer[i] = memalign(0x1000, size);
+        memset(this->hidden->buffer[i], 0, size);
+        this->hidden->source_buffer[i].next = NULL;
+        this->hidden->source_buffer[i].buffer = this->hidden->buffer[i];
+        this->hidden->source_buffer[i].buffer_size =
+            (u64) this->spec.size / this->spec.channels / 2;
+        this->hidden->source_buffer[i].data_size = (u64) this->spec.size;
+        this->hidden->source_buffer[i].data_offset = (u64) 0;
+        audoutAppendAudioOutBuffer(&this->hidden->source_buffer[i]);
+    }
+
+    return 0;
+}
+
+static void
+SWITCHAUDIO_PlayDevice(_THIS)
+{
+    audoutAppendAudioOutBuffer(this->hidden->released_buffer);
+}
+
+static void
+SWITCHAUDIO_WaitDevice(_THIS)
+{
+
+}
+
+static Uint8
+*SWITCHAUDIO_GetDeviceBuf(_THIS)
+{
+    audoutWaitPlayFinish(&this->hidden->released_buffer,
+                         &this->hidden->released_count, U64_MAX);
+
+    return this->hidden->released_buffer->buffer;
+}
+
+static void
+SWITCHAUDIO_CloseDevice(_THIS)
+{
+    if (this->hidden->buffer[0]) {
+        free(this->hidden->buffer[0]);
+    }
+    if (this->hidden->buffer[1]) {
+        free(this->hidden->buffer[1]);
+    }
+
+    audoutStopAudioOut();
+    audoutExit();
+
+    SDL_free(this->hidden);
+}
+
+static void
+SWITCHAUDIO_ThreadInit(_THIS)
+{
+
+}
+
+static int
+SWITCHAUDIO_Init(SDL_AudioDriverImpl *impl)
+{
+    impl->OpenDevice = SWITCHAUDIO_OpenDevice;
+    impl->PlayDevice = SWITCHAUDIO_PlayDevice;
+    impl->WaitDevice = SWITCHAUDIO_WaitDevice;
+    impl->GetDeviceBuf = SWITCHAUDIO_GetDeviceBuf;
+    impl->CloseDevice = SWITCHAUDIO_CloseDevice;
+    impl->ThreadInit = SWITCHAUDIO_ThreadInit;
+
+    impl->OnlyHasDefaultOutputDevice = 1;
+
+    return 1;
+}
+
+AudioBootStrap SWITCHAUDIO_bootstrap = {
+    "switch", "Nintendo Switch audio driver", SWITCHAUDIO_Init, 0
+};
+
+#endif /* SDL_AUDIO_DRIVER_SWITCH */

src/audio/switch/SDL_switchaudio.h

@@ -0,0 +1,40 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_switchaudio_h_
+#define SDL_switchaudio_h_
+
+#include <switch.h>
+#include "../SDL_sysaudio.h"
+
+/* Hidden "this" pointer for the audio functions */
+#define _THIS   SDL_AudioDevice *this
+
+struct SDL_PrivateAudioData
+{
+    void *buffer[2];
+    AudioOutBuffer source_buffer[2];
+    AudioOutBuffer *released_buffer;
+    u32 released_count;
+
+};
+
+#endif /* SDL_switchaudio_h_ */