SDL  2.0
SDL_pspaudio.c
Go to the documentation of this file.
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 #include "../../SDL_internal.h"
22 
23 #if SDL_AUDIO_DRIVER_PSP
24 
25 #include <stdio.h>
26 #include <string.h>
27 #include <stdlib.h>
28 #include <malloc.h>
29 
30 #include "SDL_audio.h"
31 #include "SDL_error.h"
32 #include "SDL_timer.h"
33 #include "../SDL_audiomem.h"
34 #include "../SDL_audio_c.h"
35 #include "../SDL_audiodev_c.h"
36 #include "../SDL_sysaudio.h"
37 #include "SDL_pspaudio.h"
38 
39 #include <pspaudio.h>
40 #include <pspthreadman.h>
41 
42 /* The tag name used by PSP audio */
43 #define PSPAUD_DRIVER_NAME "psp"
44 
45 static int
46 PSPAUD_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
47 {
48  int format, mixlen, i;
49  this->hidden = (struct SDL_PrivateAudioData *)
50  SDL_malloc(sizeof(*this->hidden));
51  if (this->hidden == NULL) {
52  return SDL_OutOfMemory();
53  }
54  SDL_memset(this->hidden, 0, sizeof(*this->hidden));
55  switch (this->spec.format & 0xff) {
56  case 8:
57  case 16:
58  this->spec.format = AUDIO_S16LSB;
59  break;
60  default:
61  return SDL_SetError("Unsupported audio format");
62  }
63 
64  /* The sample count must be a multiple of 64. */
65  this->spec.samples = PSP_AUDIO_SAMPLE_ALIGN(this->spec.samples);
66  this->spec.freq = 44100;
67 
68  /* Update the fragment size as size in bytes. */
69 /* SDL_CalculateAudioSpec(this->spec); MOD */
70  switch (this->spec.format) {
71  case AUDIO_U8:
72  this->spec.silence = 0x80;
73  break;
74  default:
75  this->spec.silence = 0x00;
76  break;
77  }
78  this->spec.size = SDL_AUDIO_BITSIZE(this->spec.format) / 8;
79  this->spec.size *= this->spec.channels;
80  this->spec.size *= this->spec.samples;
81 
82 /* ========================================== */
83 
84  /* Allocate the mixing buffer. Its size and starting address must
85  be a multiple of 64 bytes. Our sample count is already a multiple of
86  64, so spec->size should be a multiple of 64 as well. */
87  mixlen = this->spec.size * NUM_BUFFERS;
88  this->hidden->rawbuf = (Uint8 *) memalign(64, mixlen);
89  if (this->hidden->rawbuf == NULL) {
90  return SDL_SetError("Couldn't allocate mixing buffer");
91  }
92 
93  /* Setup the hardware channel. */
94  if (this->spec.channels == 1) {
95  format = PSP_AUDIO_FORMAT_MONO;
96  } else {
97  format = PSP_AUDIO_FORMAT_STEREO;
98  }
99  this->hidden->channel = sceAudioChReserve(PSP_AUDIO_NEXT_CHANNEL, this->spec.samples, format);
100  if (this->hidden->channel < 0) {
101  free(this->hidden->rawbuf);
102  this->hidden->rawbuf = NULL;
103  return SDL_SetError("Couldn't reserve hardware channel");
104  }
105 
106  memset(this->hidden->rawbuf, 0, mixlen);
107  for (i = 0; i < NUM_BUFFERS; i++) {
108  this->hidden->mixbufs[i] = &this->hidden->rawbuf[i * this->spec.size];
109  }
110 
111  this->hidden->next_buffer = 0;
112  return 0;
113 }
114 
115 static void PSPAUD_PlayDevice(_THIS)
116 {
117  Uint8 *mixbuf = this->hidden->mixbufs[this->hidden->next_buffer];
118 
119  if (this->spec.channels == 1) {
120  sceAudioOutputBlocking(this->hidden->channel, PSP_AUDIO_VOLUME_MAX, mixbuf);
121  } else {
122  sceAudioOutputPannedBlocking(this->hidden->channel, PSP_AUDIO_VOLUME_MAX, PSP_AUDIO_VOLUME_MAX, mixbuf);
123  }
124 
125  this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
126 }
127 
128 /* This function waits until it is possible to write a full sound buffer */
129 static void PSPAUD_WaitDevice(_THIS)
130 {
131  /* Because we block when sending audio, there's no need for this function to do anything. */
132 }
133 static Uint8 *PSPAUD_GetDeviceBuf(_THIS)
134 {
135  return this->hidden->mixbufs[this->hidden->next_buffer];
136 }
137 
138 static void PSPAUD_CloseDevice(_THIS)
139 {
140  if (this->hidden->channel >= 0) {
141  sceAudioChRelease(this->hidden->channel);
142  this->hidden->channel = -1;
143  }
144 
145  if (this->hidden->rawbuf != NULL) {
146  free(this->hidden->rawbuf);
147  this->hidden->rawbuf = NULL;
148  }
149 }
150 static void PSPAUD_ThreadInit(_THIS)
151 {
152  /* Increase the priority of this audio thread by 1 to put it
153  ahead of other SDL threads. */
154  SceUID thid;
155  SceKernelThreadInfo status;
156  thid = sceKernelGetThreadId();
157  status.size = sizeof(SceKernelThreadInfo);
158  if (sceKernelReferThreadStatus(thid, &status) == 0) {
159  sceKernelChangeThreadPriority(thid, status.currentPriority - 1);
160  }
161 }
162 
163 
164 static int
165 PSPAUD_Init(SDL_AudioDriverImpl * impl)
166 {
167 
168  /* Set the function pointers */
169  impl->OpenDevice = PSPAUD_OpenDevice;
170  impl->PlayDevice = PSPAUD_PlayDevice;
171  impl->WaitDevice = PSPAUD_WaitDevice;
172  impl->GetDeviceBuf = PSPAUD_GetDeviceBuf;
173  impl->WaitDone = PSPAUD_WaitDevice;
174  impl->CloseDevice = PSPAUD_CloseDevice;
175  impl->ThreadInit = PSPAUD_ThreadInit;
176 
177  /* PSP audio device */
178  impl->OnlyHasDefaultOutputDevice = 1;
179 /*
180  impl->HasCaptureSupport = 1;
181 
182  impl->OnlyHasDefaultInputDevice = 1;
183 */
184  /*
185  impl->DetectDevices = DSOUND_DetectDevices;
186  impl->Deinitialize = DSOUND_Deinitialize;
187  */
188  return 1; /* this audio target is available. */
189 }
190 
192  "psp", "PSP audio driver", PSPAUD_Init, 0
193 };
194 
195  /* SDL_AUDI */
196 
197 #endif /* SDL_AUDIO_DRIVER_PSP */
198 
199 /* vi: set ts=4 sw=4 expandtab: */
Uint8 silence
Definition: SDL_audio.h:173
SDL_EventEntry * free
Definition: SDL_events.c:81
#define memset
Definition: SDL_malloc.c:639
void(* PlayDevice)(_THIS)
Definition: SDL_sysaudio.h:75
Uint16 samples
Definition: SDL_audio.h:174
void(* WaitDevice)(_THIS)
Definition: SDL_sysaudio.h:74
SDL_AudioSpec spec
Definition: loopwave.c:35
#define AUDIO_U8
Definition: SDL_audio.h:89
void(* ThreadInit)(_THIS)
Definition: SDL_sysaudio.h:73
Uint8 channels
Definition: SDL_audio.h:172
#define _THIS
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:139
#define SDL_AUDIO_BITSIZE(x)
Definition: SDL_audio.h:75
Uint32 size
Definition: SDL_audio.h:176
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:42
int(* OpenDevice)(_THIS, void *handle, const char *devname, int iscapture)
Definition: SDL_sysaudio.h:72
#define NUM_BUFFERS
Definition: SDL_pspaudio.h:30
#define NULL
Definition: begin_code.h:143
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
#define SDL_SetError
void(* CloseDevice)(_THIS)
Definition: SDL_sysaudio.h:79
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: SDL_opengl.h:1565
SDL_AudioFormat format
Definition: SDL_audio.h:171
#define AUDIO_S16LSB
Definition: SDL_audio.h:92
Uint8 *(* GetDeviceBuf)(_THIS)
Definition: SDL_sysaudio.h:77
#define SDL_malloc
AudioBootStrap PSPAUD_bootstrap
#define SDL_memset
void(* WaitDone)(_THIS)
Definition: SDL_sysaudio.h:78