1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <malloc.h>
#include "osystem.h"
#define SFX_THREAD_STACKSIZE (1024 * 128)
#define SFX_THREAD_PRIO 80
#define SFX_THREAD_FRAG_SIZE (1024 * 8)
#define SFX_BUFFERS 3
static lwpq_t sfx_queue;
static lwp_t sfx_thread;
static u8 *sfx_stack;
static bool sfx_thread_running = false;
static bool sfx_thread_quit = false;
static u32 sb_hw;
static u8 *sound_buffer[SFX_BUFFERS];
static void audio_switch_buffers() {
sb_hw = (sb_hw + 1) % SFX_BUFFERS;
AUDIO_InitDMA((u32) sound_buffer[sb_hw], SFX_THREAD_FRAG_SIZE);
LWP_ThreadSignal(sfx_queue);
}
static void * sfx_thread_func(void *arg) {
Audio::MixerImpl *mixer = (Audio::MixerImpl *) arg;
u8 sb_sw;
while (true) {
LWP_ThreadSleep(sfx_queue);
if (sfx_thread_quit)
break;
// the hardware uses two buffers: a front and a back buffer
// we use 3 buffers here: two are beeing pushed to the DSP,
// and the free one is where our mixer writes to
// thus the latency of our stream is:
// 8192 [frag size] / 48000 / 2 [16bit] / 2 [stereo] * 2 [hw buffers]
// -> 85.3ms
sb_sw = (sb_hw + 1) % SFX_BUFFERS;
mixer->mixCallback(sound_buffer[sb_sw], SFX_THREAD_FRAG_SIZE);
DCFlushRange(sound_buffer[sb_sw], SFX_THREAD_FRAG_SIZE);
}
return NULL;
}
void OSystem_Wii::initSfx() {
_mixer = new Audio::MixerImpl(this, 48000);
sfx_thread_running = false;
sfx_thread_quit = false;
sfx_stack = (u8 *) memalign(32, SFX_THREAD_STACKSIZE);
if (sfx_stack) {
memset(sfx_stack, 0, SFX_THREAD_STACKSIZE);
LWP_InitQueue(&sfx_queue);
s32 res = LWP_CreateThread(&sfx_thread, sfx_thread_func, _mixer, sfx_stack,
SFX_THREAD_STACKSIZE, SFX_THREAD_PRIO);
if (res) {
printf("ERROR creating sfx thread: %d\n", res);
LWP_CloseQueue(sfx_queue);
return;
}
sfx_thread_running = true;
}
for (u32 i = 0; i < SFX_BUFFERS; ++i) {
sound_buffer[i] = (u8 *) memalign(32, SFX_THREAD_FRAG_SIZE);
memset(sound_buffer[i], 0, SFX_THREAD_FRAG_SIZE);
DCFlushRange(sound_buffer[i], SFX_THREAD_FRAG_SIZE);
}
_mixer->setReady(true);
sb_hw = 0;
AUDIO_SetDSPSampleRate(AI_SAMPLERATE_48KHZ);
AUDIO_RegisterDMACallback(audio_switch_buffers);
AUDIO_InitDMA((u32) sound_buffer[sb_hw], SFX_THREAD_FRAG_SIZE);
AUDIO_StartDMA();
}
void OSystem_Wii::deinitSfx() {
if (_mixer)
_mixer->setReady(false);
AUDIO_StopDMA();
AUDIO_RegisterDMACallback(NULL);
if (sfx_thread_running) {
sfx_thread_quit = true;
LWP_ThreadBroadcast(sfx_queue);
LWP_JoinThread(sfx_thread, NULL);
LWP_CloseQueue(sfx_queue);
free(sfx_stack);
sfx_thread_running = false;
for (u32 i = 0; i < SFX_BUFFERS; ++i)
free(sound_buffer[i]);
}
}
|
