1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
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 */
45 static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data);
46
47 /* FIXME: Make use of latency if needed */
nacl_audio_callback(void * samples,uint32_t buffer_size,PP_TimeDelta latency,void * data)48 static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data) {
49 SDL_AudioDevice* _this = (SDL_AudioDevice*) data;
50
51 SDL_LockMutex(private->mutex); /* !!! FIXME: is this mutex necessary? */
52
53 if (SDL_AtomicGet(&_this->enabled) && !SDL_AtomicGet(&_this->paused)) {
54 if (_this->convert.needed) {
55 SDL_LockMutex(_this->mixer_lock);
56 (*_this->spec.callback) (_this->spec.userdata,
57 (Uint8 *) _this->convert.buf,
58 _this->convert.len);
59 SDL_UnlockMutex(_this->mixer_lock);
60 SDL_ConvertAudio(&_this->convert);
61 SDL_memcpy(samples, _this->convert.buf, _this->convert.len_cvt);
62 } else {
63 SDL_LockMutex(_this->mixer_lock);
64 (*_this->spec.callback) (_this->spec.userdata, (Uint8 *) samples, buffer_size);
65 SDL_UnlockMutex(_this->mixer_lock);
66 }
67 } else {
68 SDL_memset(samples, _this->spec.silence, buffer_size);
69 }
70
71 SDL_UnlockMutex(private->mutex);
72 }
73
NACLAUDIO_CloseDevice(SDL_AudioDevice * device)74 static void NACLAUDIO_CloseDevice(SDL_AudioDevice *device) {
75 const PPB_Core *core = PSInterfaceCore();
76 const PPB_Audio *ppb_audio = PSInterfaceAudio();
77 SDL_PrivateAudioData *hidden = (SDL_PrivateAudioData *) device->hidden;
78
79 ppb_audio->StopPlayback(hidden->audio);
80 SDL_DestroyMutex(hidden->mutex);
81 core->ReleaseResource(hidden->audio);
82 }
83
84 static int
NACLAUDIO_OpenDevice(_THIS,void * handle,const char * devname,int iscapture)85 NACLAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture) {
86 PP_Instance instance = PSGetInstanceId();
87 const PPB_Audio *ppb_audio = PSInterfaceAudio();
88 const PPB_AudioConfig *ppb_audiocfg = PSInterfaceAudioConfig();
89
90 private = (SDL_PrivateAudioData *) SDL_calloc(1, (sizeof *private));
91 if (private == NULL) {
92 SDL_OutOfMemory();
93 return 0;
94 }
95
96 private->mutex = SDL_CreateMutex();
97 _this->spec.freq = 44100;
98 _this->spec.format = AUDIO_S16LSB;
99 _this->spec.channels = 2;
100 _this->spec.samples = ppb_audiocfg->RecommendSampleFrameCount(
101 instance,
102 PP_AUDIOSAMPLERATE_44100,
103 SAMPLE_FRAME_COUNT);
104
105 /* Calculate the final parameters for this audio specification */
106 SDL_CalculateAudioSpec(&_this->spec);
107
108 private->audio = ppb_audio->Create(
109 instance,
110 ppb_audiocfg->CreateStereo16Bit(instance, PP_AUDIOSAMPLERATE_44100, _this->spec.samples),
111 nacl_audio_callback,
112 _this);
113
114 /* Start audio playback while we are still on the main thread. */
115 ppb_audio->StartPlayback(private->audio);
116
117 return 1;
118 }
119
120 static int
NACLAUDIO_Init(SDL_AudioDriverImpl * impl)121 NACLAUDIO_Init(SDL_AudioDriverImpl * impl)
122 {
123 if (PSGetInstanceId() == 0) {
124 return 0;
125 }
126
127 /* Set the function pointers */
128 impl->OpenDevice = NACLAUDIO_OpenDevice;
129 impl->CloseDevice = NACLAUDIO_CloseDevice;
130 impl->OnlyHasDefaultOutputDevice = 1;
131 impl->ProvidesOwnCallbackThread = 1;
132 /*
133 * impl->WaitDevice = NACLAUDIO_WaitDevice;
134 * impl->GetDeviceBuf = NACLAUDIO_GetDeviceBuf;
135 * impl->PlayDevice = NACLAUDIO_PlayDevice;
136 * impl->Deinitialize = NACLAUDIO_Deinitialize;
137 */
138
139 return 1;
140 }
141
142 AudioBootStrap NACLAUDIO_bootstrap = {
143 NACLAUDIO_DRIVER_NAME, "SDL NaCl Audio Driver",
144 NACLAUDIO_Init, 0
145 };
146
147 #endif /* SDL_AUDIO_DRIVER_NACL */
148
149 /* vi: set ts=4 sw=4 expandtab: */
150