SDL  2.0
SDL_pspaudio.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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_audio_c.h"
34 #include "../SDL_audiodev_c.h"
35 #include "../SDL_sysaudio.h"
36 #include "SDL_pspaudio.h"
37 
38 #include <pspaudio.h>
39 #include <pspthreadman.h>
40 
41 /* The tag name used by PSP audio */
42 #define PSPAUDIO_DRIVER_NAME "psp"
43 
44 static int
45 PSPAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
46 {
47  int format, mixlen, i;
48  this->hidden = (struct SDL_PrivateAudioData *)
49  SDL_malloc(sizeof(*this->hidden));
50  if (this->hidden == NULL) {
51  return SDL_OutOfMemory();
52  }
53  SDL_zerop(this->hidden);
54  switch (this->spec.format & 0xff) {
55  case 8:
56  case 16:
57  this->spec.format = AUDIO_S16LSB;
58  break;
59  default:
60  return SDL_SetError("Unsupported audio format");
61  }
62 
63  /* The sample count must be a multiple of 64. */
64  this->spec.samples = PSP_AUDIO_SAMPLE_ALIGN(this->spec.samples);
65  this->spec.freq = 44100;
66 
67  /* Update the fragment size as size in bytes. */
69 
70  /* Allocate the mixing buffer. Its size and starting address must
71  be a multiple of 64 bytes. Our sample count is already a multiple of
72  64, so spec->size should be a multiple of 64 as well. */
73  mixlen = this->spec.size * NUM_BUFFERS;
74  this->hidden->rawbuf = (Uint8 *) memalign(64, mixlen);
75  if (this->hidden->rawbuf == NULL) {
76  return SDL_SetError("Couldn't allocate mixing buffer");
77  }
78 
79  /* Setup the hardware channel. */
80  if (this->spec.channels == 1) {
81  format = PSP_AUDIO_FORMAT_MONO;
82  } else {
83  this->spec.channels = 2;
84  format = PSP_AUDIO_FORMAT_STEREO;
85  }
86  this->hidden->channel = sceAudioChReserve(PSP_AUDIO_NEXT_CHANNEL, this->spec.samples, format);
87  if (this->hidden->channel < 0) {
88  free(this->hidden->rawbuf);
89  this->hidden->rawbuf = NULL;
90  return SDL_SetError("Couldn't reserve hardware channel");
91  }
92 
93  memset(this->hidden->rawbuf, 0, mixlen);
94  for (i = 0; i < NUM_BUFFERS; i++) {
95  this->hidden->mixbufs[i] = &this->hidden->rawbuf[i * this->spec.size];
96  }
97 
98  this->hidden->next_buffer = 0;
99  return 0;
100 }
101 
102 static void PSPAUDIO_PlayDevice(_THIS)
103 {
104  Uint8 *mixbuf = this->hidden->mixbufs[this->hidden->next_buffer];
105 
106  if (this->spec.channels == 1) {
107  sceAudioOutputBlocking(this->hidden->channel, PSP_AUDIO_VOLUME_MAX, mixbuf);
108  } else {
109  sceAudioOutputPannedBlocking(this->hidden->channel, PSP_AUDIO_VOLUME_MAX, PSP_AUDIO_VOLUME_MAX, mixbuf);
110  }
111 
112  this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
113 }
114 
115 /* This function waits until it is possible to write a full sound buffer */
116 static void PSPAUDIO_WaitDevice(_THIS)
117 {
118  /* Because we block when sending audio, there's no need for this function to do anything. */
119 }
120 static Uint8 *PSPAUDIO_GetDeviceBuf(_THIS)
121 {
122  return this->hidden->mixbufs[this->hidden->next_buffer];
123 }
124 
125 static void PSPAUDIO_CloseDevice(_THIS)
126 {
127  if (this->hidden->channel >= 0) {
128  sceAudioChRelease(this->hidden->channel);
129  }
130  free(this->hidden->rawbuf); /* this uses memalign(), not SDL_malloc(). */
131  SDL_free(this->hidden);
132 }
133 
134 static void PSPAUDIO_ThreadInit(_THIS)
135 {
136  /* Increase the priority of this audio thread by 1 to put it
137  ahead of other SDL threads. */
138  SceUID thid;
139  SceKernelThreadInfo status;
140  thid = sceKernelGetThreadId();
141  status.size = sizeof(SceKernelThreadInfo);
142  if (sceKernelReferThreadStatus(thid, &status) == 0) {
143  sceKernelChangeThreadPriority(thid, status.currentPriority - 1);
144  }
145 }
146 
147 
148 static int
149 PSPAUDIO_Init(SDL_AudioDriverImpl * impl)
150 {
151  /* Set the function pointers */
152  impl->OpenDevice = PSPAUDIO_OpenDevice;
153  impl->PlayDevice = PSPAUDIO_PlayDevice;
154  impl->WaitDevice = PSPAUDIO_WaitDevice;
155  impl->GetDeviceBuf = PSPAUDIO_GetDeviceBuf;
156  impl->CloseDevice = PSPAUDIO_CloseDevice;
157  impl->ThreadInit = PSPAUDIO_ThreadInit;
158 
159  /* PSP audio device */
160  impl->OnlyHasDefaultOutputDevice = 1;
161 /*
162  impl->HasCaptureSupport = 1;
163 
164  impl->OnlyHasDefaultCaptureDevice = 1;
165 */
166  /*
167  impl->DetectDevices = DSOUND_DetectDevices;
168  impl->Deinitialize = DSOUND_Deinitialize;
169  */
170  return 1; /* this audio target is available. */
171 }
172 
174  "psp", "PSP audio driver", PSPAUDIO_Init, 0
175 };
176 
177  /* SDL_AUDI */
178 
179 #endif /* SDL_AUDIO_DRIVER_PSP */
180 
181 /* vi: set ts=4 sw=4 expandtab: */
SDL_EventEntry * free
Definition: SDL_events.c:84
#define memset
Definition: SDL_malloc.c:619
AudioBootStrap PSPAUDIO_bootstrap
void(* PlayDevice)(_THIS)
Definition: SDL_sysaudio.h:73
Uint16 samples
Definition: SDL_audio.h:183
void(* WaitDevice)(_THIS)
Definition: SDL_sysaudio.h:72
#define SDL_zerop(x)
Definition: SDL_stdinc.h:417
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: SDL_opengl.h:1572
SDL_AudioSpec spec
Definition: loopwave.c:31
void(* ThreadInit)(_THIS)
Definition: SDL_sysaudio.h:69
EGLImageKHR EGLint EGLint * handle
Definition: eglext.h:937
Uint8 channels
Definition: SDL_audio.h:181
#define _THIS
uint8_t Uint8
Definition: SDL_stdinc.h:157
#define SDL_free
void SDL_CalculateAudioSpec(SDL_AudioSpec *spec)
Definition: SDL_audio.c:1605
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:50
Uint32 size
Definition: SDL_audio.h:185
int(* OpenDevice)(_THIS, void *handle, const char *devname, int iscapture)
Definition: SDL_sysaudio.h:68
#define NUM_BUFFERS
Definition: SDL_pspaudio.h:30
#define NULL
Definition: begin_code.h:164
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
#define SDL_SetError
void(* CloseDevice)(_THIS)
Definition: SDL_sysaudio.h:79
SDL_AudioFormat format
Definition: SDL_audio.h:180
#define AUDIO_S16LSB
Definition: SDL_audio.h:92
Uint8 *(* GetDeviceBuf)(_THIS)
Definition: SDL_sysaudio.h:75
#define SDL_malloc