early-access version 1611

externals/SDL/src/audio/nacl/SDL_naclaudio.c

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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 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_NACL
+
+#include "SDL_naclaudio.h"
+
+#include "SDL_audio.h"
+#include "SDL_mutex.h"
+#include "../SDL_audio_c.h"
+#include "../SDL_audiodev_c.h"
+
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi_simple/ps.h"
+#include "ppapi_simple/ps_interface.h"
+#include "ppapi_simple/ps_event.h"
+
+/* The tag name used by NACL audio */
+#define NACLAUDIO_DRIVER_NAME         "nacl"
+
+#define SAMPLE_FRAME_COUNT 4096
+
+/* Audio driver functions */
+static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data);
+
+/* FIXME: Make use of latency if needed */
+static void nacl_audio_callback(void* stream, uint32_t buffer_size, PP_TimeDelta latency, void* data) {
+    const int len = (int) buffer_size;
+    SDL_AudioDevice* _this = (SDL_AudioDevice*) data;
+    SDL_AudioCallback callback = _this->callbackspec.callback;
+    
+    SDL_LockMutex(private->mutex);  /* !!! FIXME: is this mutex necessary? */
+
+    /* Only do something if audio is enabled */
+    if (!SDL_AtomicGet(&_this->enabled) || SDL_AtomicGet(&_this->paused)) {
+        if (_this->stream) {
+            SDL_AudioStreamClear(_this->stream);
+        }
+        SDL_memset(stream, _this->spec.silence, len);
+        return;
+    }
+
+    SDL_assert(_this->spec.size == len);
+
+    if (_this->stream == NULL) {  /* no conversion necessary. */
+        SDL_LockMutex(_this->mixer_lock);
+        callback(_this->callbackspec.userdata, stream, len);
+        SDL_UnlockMutex(_this->mixer_lock);
+    } else {  /* streaming/converting */
+        const int stream_len = _this->callbackspec.size;
+        while (SDL_AudioStreamAvailable(_this->stream) < len) {
+            callback(_this->callbackspec.userdata, _this->work_buffer, stream_len);
+            if (SDL_AudioStreamPut(_this->stream, _this->work_buffer, stream_len) == -1) {
+                SDL_AudioStreamClear(_this->stream);
+                SDL_AtomicSet(&_this->enabled, 0);
+                break;
+            }
+        }
+
+        const int got = SDL_AudioStreamGet(_this->stream, stream, len);
+        SDL_assert((got < 0) || (got == len));
+        if (got != len) {
+            SDL_memset(stream, _this->spec.silence, len);
+        }
+    }
+
+    SDL_UnlockMutex(private->mutex);
+}
+
+static void NACLAUDIO_CloseDevice(SDL_AudioDevice *device) {
+    const PPB_Core *core = PSInterfaceCore();
+    const PPB_Audio *ppb_audio = PSInterfaceAudio();
+    SDL_PrivateAudioData *hidden = (SDL_PrivateAudioData *) device->hidden;
+    
+    ppb_audio->StopPlayback(hidden->audio);
+    SDL_DestroyMutex(hidden->mutex);
+    core->ReleaseResource(hidden->audio);
+}
+
+static int
+NACLAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture) {
+    PP_Instance instance = PSGetInstanceId();
+    const PPB_Audio *ppb_audio = PSInterfaceAudio();
+    const PPB_AudioConfig *ppb_audiocfg = PSInterfaceAudioConfig();
+    
+    private = (SDL_PrivateAudioData *) SDL_calloc(1, (sizeof *private));
+    if (private == NULL) {
+        return SDL_OutOfMemory();
+    }
+    
+    private->mutex = SDL_CreateMutex();
+    _this->spec.freq = 44100;
+    _this->spec.format = AUDIO_S16LSB;
+    _this->spec.channels = 2;
+    _this->spec.samples = ppb_audiocfg->RecommendSampleFrameCount(
+        instance, 
+        PP_AUDIOSAMPLERATE_44100, 
+        SAMPLE_FRAME_COUNT);
+    
+    /* Calculate the final parameters for this audio specification */
+    SDL_CalculateAudioSpec(&_this->spec);
+    
+    private->audio = ppb_audio->Create(
+        instance,
+        ppb_audiocfg->CreateStereo16Bit(instance, PP_AUDIOSAMPLERATE_44100, _this->spec.samples),
+        nacl_audio_callback, 
+        _this);
+    
+    /* Start audio playback while we are still on the main thread. */
+    ppb_audio->StartPlayback(private->audio);
+    
+    return 0;
+}
+
+static int
+NACLAUDIO_Init(SDL_AudioDriverImpl * impl)
+{
+    if (PSGetInstanceId() == 0) {
+        return 0;
+    }
+    
+    /* Set the function pointers */
+    impl->OpenDevice = NACLAUDIO_OpenDevice;
+    impl->CloseDevice = NACLAUDIO_CloseDevice;
+    impl->OnlyHasDefaultOutputDevice = 1;
+    impl->ProvidesOwnCallbackThread = 1;
+    /*
+     *    impl->WaitDevice = NACLAUDIO_WaitDevice;
+     *    impl->GetDeviceBuf = NACLAUDIO_GetDeviceBuf;
+     *    impl->PlayDevice = NACLAUDIO_PlayDevice;
+     *    impl->Deinitialize = NACLAUDIO_Deinitialize;
+     */
+    
+    return 1;
+}
+
+AudioBootStrap NACLAUDIO_bootstrap = {
+    NACLAUDIO_DRIVER_NAME, "SDL NaCl Audio Driver",
+    NACLAUDIO_Init, 0
+};
+
+#endif /* SDL_AUDIO_DRIVER_NACL */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/audio/nacl/SDL_naclaudio.h

@@ -0,0 +1,43 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 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"
+
+#ifndef SDL_naclaudio_h_
+#define SDL_naclaudio_h_
+
+#include "SDL_audio.h"
+#include "../SDL_sysaudio.h"
+#include "SDL_mutex.h"
+
+#include "ppapi/c/ppb_audio.h"
+
+#define _THIS  SDL_AudioDevice *_this
+#define private _this->hidden
+
+typedef struct SDL_PrivateAudioData {
+  SDL_mutex* mutex;
+  PP_Resource audio;
+} SDL_PrivateAudioData;
+
+#endif /* SDL_naclaudio_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */