SDL_naclaudio.c
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2019 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: */
SDL_memset
#define SDL_memset
Definition: SDL_dynapi_overrides.h:386
SDL_AudioDriverImpl::ProvidesOwnCallbackThread
int ProvidesOwnCallbackThread
Definition: SDL_sysaudio.h:88
SDL_LockMutex
#define SDL_LockMutex
Definition: SDL_dynapi_overrides.h:260
NULL
#define NULL
Definition: begin_code.h:167
SDL_AudioStreamAvailable
#define SDL_AudioStreamAvailable
Definition: SDL_dynapi_overrides.h:647
handle
EGLImageKHR EGLint EGLint * handle
Definition: eglext.h:937
samples
GLsizei samples
Definition: SDL_opengl_glext.h:1185
stream
GLuint GLuint stream
Definition: SDL_opengl_glext.h:1776
SDL_AudioDriverImpl::OpenDevice
int(* OpenDevice)(_THIS, void *handle, const char *devname, int iscapture)
Definition: SDL_sysaudio.h:68
SDL_AudioStreamGet
#define SDL_AudioStreamGet
Definition: SDL_dynapi_overrides.h:645
SDL_CreateMutex
#define SDL_CreateMutex
Definition: SDL_dynapi_overrides.h:259
callback
static Uint32 callback(Uint32 interval, void *param)
Definition: testtimer.c:34
AudioBootStrap
Definition: SDL_sysaudio.h:176
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
SDL_PrivateAudioData
Definition: SDL_alsa_audio.h:33
SDL_PrivateAudioData::mutex
SDL_mutex * mutex
Definition: SDL_naclaudio.h:37
len
GLenum GLsizei len
Definition: SDL_opengl_glext.h:2926
_this
static SDL_VideoDevice * _this
Definition: SDL_video.c:118
SDL_audio.h
private
#define private
Definition: SDL_naclaudio.h:34
SDL_AudioDriverImpl
Definition: SDL_sysaudio.h:65
SDL_mutex.h
SDL_AudioDriverImpl::OnlyHasDefaultOutputDevice
int OnlyHasDefaultOutputDevice
Definition: SDL_sysaudio.h:91
NACLAUDIO_bootstrap
AudioBootStrap NACLAUDIO_bootstrap
SDL_CalculateAudioSpec
void SDL_CalculateAudioSpec(SDL_AudioSpec *spec)
Definition: SDL_audio.c:1668
_THIS
#define _THIS
Definition: SDL_alsa_audio.h:31
SDL_AudioStreamPut
#define SDL_AudioStreamPut
Definition: SDL_dynapi_overrides.h:644
SDL_assert
#define SDL_assert(condition)
Definition: SDL_assert.h:169
SDL_OutOfMemory
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
SDL_calloc
#define SDL_calloc
Definition: SDL_dynapi_overrides.h:375
uint32_t
unsigned int uint32_t
Definition: SDL_config_windows.h:63
SDL_PrivateAudioData::audio
PP_Resource audio
Definition: SDL_naclaudio.h:38
SDL_AudioStreamClear
#define SDL_AudioStreamClear
Definition: SDL_dynapi_overrides.h:646
SDL_DestroyMutex
#define SDL_DestroyMutex
Definition: SDL_dynapi_overrides.h:263
SDL_naclaudio.h
AUDIO_S16LSB
#define AUDIO_S16LSB
Definition: SDL_audio.h:92
SDL_AtomicSet
#define SDL_AtomicSet
Definition: SDL_dynapi_overrides.h:67
SDL_AtomicGet
#define SDL_AtomicGet
Definition: SDL_dynapi_overrides.h:68
SDL_AudioCallback
void(* SDL_AudioCallback)(void *userdata, Uint8 *stream, int len)
Definition: SDL_audio.h:163
SDL_UnlockMutex
#define SDL_UnlockMutex
Definition: SDL_dynapi_overrides.h:262
device
static SDL_AudioDeviceID device
Definition: loopwave.c:37
SDL_AudioDriverImpl::CloseDevice
void(* CloseDevice)(_THIS)
Definition: SDL_sysaudio.h:78
SDL_AudioDevice
Definition: SDL_sysaudio.h:131