Atlas - SDL_naclaudio.c
Home / ext / SDL2 / src / audio / nacl Lines: 1 | Size: 5530 bytes [Download] [Show on GitHub] [Search similar files] [Raw] [Raw (proxy)][FILE BEGIN]1/* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2018 Sam Lantinga <[email protected]> 4 5 This software is provided 'as-is', without any express or implied 6 warranty. In no event will the authors be held liable for any damages 7 arising from the use of this software. 8 9 Permission is granted to anyone to use this software for any purpose, 10 including commercial applications, and to alter it and redistribute it 11 freely, subject to the following restrictions: 12 13 1. The origin of this software must not be misrepresented; you must not 14 claim that you wrote the original software. If you use this software 15 in a product, an acknowledgment in the product documentation would be 16 appreciated but is not required. 17 2. Altered source versions must be plainly marked as such, and must not be 18 misrepresented as being the original software. 19 3. This notice may not be removed or altered from any source distribution. 20*/ 21 22#include "../../SDL_internal.h" 23 24#if SDL_AUDIO_DRIVER_NACL 25 26#include "SDL_naclaudio.h" 27 28#include "SDL_audio.h" 29#include "SDL_mutex.h" 30#include "../SDL_audio_c.h" 31#include "../SDL_audiodev_c.h" 32 33#include "ppapi/c/pp_errors.h" 34#include "ppapi/c/pp_instance.h" 35#include "ppapi_simple/ps.h" 36#include "ppapi_simple/ps_interface.h" 37#include "ppapi_simple/ps_event.h" 38 39/* The tag name used by NACL audio */ 40#define NACLAUDIO_DRIVER_NAME "nacl" 41 42#define SAMPLE_FRAME_COUNT 4096 43 44/* Audio driver functions */ 45static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data); 46 47/* FIXME: Make use of latency if needed */ 48static void nacl_audio_callback(void* stream, uint32_t buffer_size, PP_TimeDelta latency, void* data) { 49 const int len = (int) buffer_size; 50 SDL_AudioDevice* _this = (SDL_AudioDevice*) data; 51 SDL_AudioCallback callback = _this->callbackspec.callback; 52 53 SDL_LockMutex(private->mutex); /* !!! FIXME: is this mutex necessary? */ 54 55 /* Only do something if audio is enabled */ 56 if (!SDL_AtomicGet(&_this->enabled) || SDL_AtomicGet(&_this->paused)) { 57 if (_this->stream) { 58 SDL_AudioStreamClear(_this->stream); 59 } 60 SDL_memset(stream, _this->spec.silence, len); 61 return; 62 } 63 64 SDL_assert(_this->spec.size == len); 65 66 if (_this->stream == NULL) { /* no conversion necessary. */ 67 SDL_LockMutex(_this->mixer_lock); 68 callback(_this->callbackspec.userdata, stream, len); 69 SDL_UnlockMutex(_this->mixer_lock); 70 } else { /* streaming/converting */ 71 const int stream_len = _this->callbackspec.size; 72 while (SDL_AudioStreamAvailable(_this->stream) < len) { 73 callback(_this->callbackspec.userdata, _this->work_buffer, stream_len); 74 if (SDL_AudioStreamPut(_this->stream, _this->work_buffer, stream_len) == -1) { 75 SDL_AudioStreamClear(_this->stream); 76 SDL_AtomicSet(&_this->enabled, 0); 77 break; 78 } 79 } 80 81 const int got = SDL_AudioStreamGet(_this->stream, stream, len); 82 SDL_assert((got < 0) || (got == len)); 83 if (got != len) { 84 SDL_memset(stream, _this->spec.silence, len); 85 } 86 } 87 88 SDL_UnlockMutex(private->mutex); 89} 90 91static void NACLAUDIO_CloseDevice(SDL_AudioDevice *device) { 92 const PPB_Core *core = PSInterfaceCore(); 93 const PPB_Audio *ppb_audio = PSInterfaceAudio(); 94 SDL_PrivateAudioData *hidden = (SDL_PrivateAudioData *) device->hidden; 95 96 ppb_audio->StopPlayback(hidden->audio); 97 SDL_DestroyMutex(hidden->mutex); 98 core->ReleaseResource(hidden->audio); 99} 100 101static int 102NACLAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture) { 103 PP_Instance instance = PSGetInstanceId(); 104 const PPB_Audio *ppb_audio = PSInterfaceAudio(); 105 const PPB_AudioConfig *ppb_audiocfg = PSInterfaceAudioConfig(); 106 107 private = (SDL_PrivateAudioData *) SDL_calloc(1, (sizeof *private)); 108 if (private == NULL) { 109 return SDL_OutOfMemory(); 110 } 111 112 private->mutex = SDL_CreateMutex(); 113 _this->spec.freq = 44100; 114 _this->spec.format = AUDIO_S16LSB; 115 _this->spec.channels = 2; 116 _this->spec.samples = ppb_audiocfg->RecommendSampleFrameCount( 117 instance, 118 PP_AUDIOSAMPLERATE_44100, 119 SAMPLE_FRAME_COUNT); 120 121 /* Calculate the final parameters for this audio specification */ 122 SDL_CalculateAudioSpec(&_this->spec); 123 124 private->audio = ppb_audio->Create( 125 instance, 126 ppb_audiocfg->CreateStereo16Bit(instance, PP_AUDIOSAMPLERATE_44100, _this->spec.samples), 127 nacl_audio_callback, 128 _this); 129 130 /* Start audio playback while we are still on the main thread. */ 131 ppb_audio->StartPlayback(private->audio); 132 133 return 0; 134} 135 136static int 137NACLAUDIO_Init(SDL_AudioDriverImpl * impl) 138{ 139 if (PSGetInstanceId() == 0) { 140 return 0; 141 } 142 143 /* Set the function pointers */ 144 impl->OpenDevice = NACLAUDIO_OpenDevice; 145 impl->CloseDevice = NACLAUDIO_CloseDevice; 146 impl->OnlyHasDefaultOutputDevice = 1; 147 impl->ProvidesOwnCallbackThread = 1; 148 /* 149 * impl->WaitDevice = NACLAUDIO_WaitDevice; 150 * impl->GetDeviceBuf = NACLAUDIO_GetDeviceBuf; 151 * impl->PlayDevice = NACLAUDIO_PlayDevice; 152 * impl->Deinitialize = NACLAUDIO_Deinitialize; 153 */ 154 155 return 1; 156} 157 158AudioBootStrap NACLAUDIO_bootstrap = { 159 NACLAUDIO_DRIVER_NAME, "SDL NaCl Audio Driver", 160 NACLAUDIO_Init, 0 161}; 162 163#endif /* SDL_AUDIO_DRIVER_NACL */ 164 165/* vi: set ts=4 sw=4 expandtab: */ 166[FILE END](C) 2025 0x4248 (C) 2025 4248 Media and 4248 Systems, All part of 0x4248 See LICENCE files for more information. Not all files are by 0x4248 always check Licencing.