SDL_naclaudio.c
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2016 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_audiomem.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 NACLAUD_DRIVER_NAME "nacl"
#define SAMPLE_FRAME_COUNT 4096
/* Audio driver functions */
static int NACLAUD_OpenDevice(_THIS, void *handle, const char *devname, int iscapture);
static void NACLAUD_CloseDevice(_THIS);
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* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data) {
SDL_AudioDevice* _this = (SDL_AudioDevice*) data;
SDL_LockMutex(private->mutex);
if (_this->enabled && !_this->paused) {
if (_this->convert.needed) {
SDL_LockMutex(_this->mixer_lock);
(*_this->spec.callback) (_this->spec.userdata,
(Uint8 *) _this->convert.buf,
_this->convert.len);
SDL_UnlockMutex(_this->mixer_lock);
SDL_ConvertAudio(&_this->convert);
SDL_memcpy(samples, _this->convert.buf, _this->convert.len_cvt);
} else {
SDL_LockMutex(_this->mixer_lock);
(*_this->spec.callback) (_this->spec.userdata, (Uint8 *) samples, buffer_size);
SDL_UnlockMutex(_this->mixer_lock);
}
} else {
SDL_memset(samples, 0, buffer_size);
}
return;
}
static void NACLAUD_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
NACLAUD_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) {
SDL_OutOfMemory();
return 0;
}
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 1;
}
static int
NACLAUD_Init(SDL_AudioDriverImpl * impl)
{
if (PSGetInstanceId() == 0) {
return 0;
}
/* Set the function pointers */
impl->OpenDevice = NACLAUD_OpenDevice;
impl->CloseDevice = NACLAUD_CloseDevice;
impl->OnlyHasDefaultOutputDevice = 1;
impl->ProvidesOwnCallbackThread = 1;
/*
* impl->WaitDevice = NACLAUD_WaitDevice;
* impl->GetDeviceBuf = NACLAUD_GetDeviceBuf;
* impl->PlayDevice = NACLAUD_PlayDevice;
* impl->Deinitialize = NACLAUD_Deinitialize;
*/
return 1;
}
AudioBootStrap NACLAUD_bootstrap = {
NACLAUD_DRIVER_NAME, "SDL NaCl Audio Driver",
NACLAUD_Init, 0
};
#endif /* SDL_AUDIO_DRIVER_NACL */
/* vi: set ts=4 sw=4 expandtab: */
SDL_PrivateAudioData::audio
PP_Resource audio
Definition: SDL_naclaudio.h:38
SDL_AudioDevice::hidden
struct SDL_PrivateAudioData * hidden
Definition: SDL_sysaudio.h:185
SDL_LockMutex
#define SDL_LockMutex
Definition: SDL_dynapi_overrides.h:266
SDL_AudioDevice::mixer_lock
SDL_mutex * mixer_lock
Definition: SDL_sysaudio.h:171
SDL_AudioCVT::len
int len
Definition: SDL_audio.h:207
SDL_AudioCVT::buf
Uint8 * buf
Definition: SDL_audio.h:206
SDL_CreateMutex
#define SDL_CreateMutex
Definition: SDL_dynapi_overrides.h:265
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1967
SDL_AudioDriverImpl::ProvidesOwnCallbackThread
int ProvidesOwnCallbackThread
Definition: SDL_sysaudio.h:89
SDL_AudioSpec::samples
Uint16 samples
Definition: SDL_audio.h:174
SDL_mutex.h
SDL_AudioDevice::spec
SDL_AudioSpec spec
Definition: SDL_sysaudio.h:150
private
#define private
Definition: SDL_naclaudio.h:34
SDL_PrivateAudioData
Definition: SDL_alsa_audio.h:33
_this
static SDL_VideoDevice * _this
Definition: SDL_video.c:114
SDL_memcpy
#define SDL_memcpy
Definition: SDL_dynapi_overrides.h:393
SDL_calloc
void * SDL_calloc(size_t nmemb, size_t size)
AudioBootStrap
Definition: SDL_sysaudio.h:189
SDL_AudioDriverImpl::OnlyHasDefaultOutputDevice
int OnlyHasDefaultOutputDevice
Definition: SDL_sysaudio.h:92
SDL_AudioSpec::freq
int freq
Definition: SDL_audio.h:170
SDL_ConvertAudio
#define SDL_ConvertAudio
Definition: SDL_dynapi_overrides.h:95
NACLAUD_bootstrap
AudioBootStrap NACLAUD_bootstrap
SDL_AudioSpec::channels
Uint8 channels
Definition: SDL_audio.h:172
_THIS
#define _THIS
Definition: SDL_alsa_audio.h:31
Uint8
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:139
SDL_PrivateAudioData::mutex
SDL_mutex * mutex
Definition: SDL_naclaudio.h:37
SDL_AudioDriverImpl
Definition: SDL_sysaudio.h:69
SDL_AudioCVT::needed
int needed
Definition: SDL_audio.h:202
SDL_naclaudio.h
SDL_CalculateAudioSpec
void SDL_CalculateAudioSpec(SDL_AudioSpec *spec)
Definition: SDL_audio.c:1419
samples
GLsizei samples
Definition: SDL_opengl_glext.h:1185
SDL_AudioSpec::callback
SDL_AudioCallback callback
Definition: SDL_audio.h:177
SDL_AudioCVT::len_cvt
int len_cvt
Definition: SDL_audio.h:208
SDL_AudioDriverImpl::OpenDevice
int(* OpenDevice)(_THIS, void *handle, const char *devname, int iscapture)
Definition: SDL_sysaudio.h:72
NULL
#define NULL
Definition: begin_code.h:143
SDL_OutOfMemory
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
uint32_t
unsigned int uint32_t
Definition: SDL_config_windows.h:62
SDL_AudioDriverImpl::CloseDevice
void(* CloseDevice)(_THIS)
Definition: SDL_sysaudio.h:79
SDL_DestroyMutex
#define SDL_DestroyMutex
Definition: SDL_dynapi_overrides.h:269
SDL_audio.h
SDL_AudioDevice
Definition: SDL_sysaudio.h:143
SDL_AudioSpec::format
SDL_AudioFormat format
Definition: SDL_audio.h:171
SDL_AudioDevice::paused
int paused
Definition: SDL_sysaudio.h:164
AUDIO_S16LSB
#define AUDIO_S16LSB
Definition: SDL_audio.h:92
SDL_AudioSpec::userdata
void * userdata
Definition: SDL_audio.h:178
SDL_UnlockMutex
#define SDL_UnlockMutex
Definition: SDL_dynapi_overrides.h:268
SDL_AudioDevice::enabled
int enabled
Definition: SDL_sysaudio.h:162
SDL_AudioDevice::convert
SDL_AudioCVT convert
Definition: SDL_sysaudio.h:153
SDL_memset
#define SDL_memset
Definition: SDL_dynapi_overrides.h:392