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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/* 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 "common/scummsys.h"
#if defined(SDL_BACKEND)
#include "backends/mixer/sdl/sdl-mixer.h"
#include "common/debug.h"
#include "common/system.h"
#include "common/config-manager.h"
#include "common/textconsole.h"
#ifdef GP2X
#define SAMPLES_PER_SEC 11025
#else
#define SAMPLES_PER_SEC 22050
#endif
//#define SAMPLES_PER_SEC 44100
SdlMixerManager::SdlMixerManager()
:
_mixer(0),
_audioSuspended(false) {
}
SdlMixerManager::~SdlMixerManager() {
_mixer->setReady(false);
SDL_CloseAudio();
delete _mixer;
}
void SdlMixerManager::init() {
// Start SDL Audio subsystem
if (SDL_InitSubSystem(SDL_INIT_AUDIO) == -1) {
error("Could not initialize SDL: %s", SDL_GetError());
}
const int maxNameLen = 20;
char sdlDriverName[maxNameLen];
sdlDriverName[0] = '\0';
SDL_AudioDriverName(sdlDriverName, maxNameLen);
debug(1, "Using SDL Audio Driver \"%s\"", sdlDriverName);
// Get the desired audio specs
SDL_AudioSpec desired = getAudioSpec(SAMPLES_PER_SEC);
// Needed as SDL_OpenAudio as of SDL-1.2.14 mutates fields in
// "desired" if used directly.
SDL_AudioSpec fmt = desired;
// Start SDL audio with the desired specs
if (SDL_OpenAudio(&fmt, &_obtained) != 0) {
warning("Could not open audio device: %s", SDL_GetError());
_mixer = new Audio::MixerImpl(g_system, desired.freq);
assert(_mixer);
_mixer->setReady(false);
} else {
debug(1, "Output sample rate: %d Hz", _obtained.freq);
if (_obtained.freq != desired.freq)
warning("SDL mixer output sample rate: %d differs from desired: %d", _obtained.freq, desired.freq);
debug(1, "Output buffer size: %d samples", _obtained.samples);
if (_obtained.samples != desired.samples)
warning("SDL mixer output buffer size: %d differs from desired: %d", _obtained.samples, desired.samples);
if (_obtained.format != desired.format)
warning("SDL mixer sound format: %d differs from desired: %d", _obtained.format, desired.format);
#ifndef __SYMBIAN32__
// The SymbianSdlMixerManager does stereo->mono downmixing,
// but otherwise we require stereo output.
if (_obtained.channels != 2)
error("SDL mixer output requires stereo output device");
#endif
_mixer = new Audio::MixerImpl(g_system, _obtained.freq);
assert(_mixer);
_mixer->setReady(true);
startAudio();
}
}
SDL_AudioSpec SdlMixerManager::getAudioSpec(uint32 outputRate) {
SDL_AudioSpec desired;
// Determine the desired output sampling frequency.
uint32 samplesPerSec = 0;
if (ConfMan.hasKey("output_rate"))
samplesPerSec = ConfMan.getInt("output_rate");
if (samplesPerSec <= 0)
samplesPerSec = outputRate;
// Determine the sample buffer size. We want it to store enough data for
// at least 1/16th of a second (though at most 8192 samples). Note
// that it must be a power of two. So e.g. at 22050 Hz, we request a
// sample buffer size of 2048.
uint32 samples = 8192;
while (samples * 16 > samplesPerSec * 2)
samples >>= 1;
memset(&desired, 0, sizeof(desired));
desired.freq = samplesPerSec;
desired.format = AUDIO_S16SYS;
desired.channels = 2;
desired.samples = (uint16)samples;
desired.callback = sdlCallback;
desired.userdata = this;
return desired;
}
void SdlMixerManager::startAudio() {
// Start the sound system
SDL_PauseAudio(0);
}
void SdlMixerManager::callbackHandler(byte *samples, int len) {
assert(_mixer);
_mixer->mixCallback(samples, len);
}
void SdlMixerManager::sdlCallback(void *this_, byte *samples, int len) {
SdlMixerManager *manager = (SdlMixerManager *)this_;
assert(manager);
manager->callbackHandler(samples, len);
}
void SdlMixerManager::suspendAudio() {
SDL_CloseAudio();
_audioSuspended = true;
}
int SdlMixerManager::resumeAudio() {
if (!_audioSuspended)
return -2;
if (SDL_OpenAudio(&_obtained, NULL) < 0) {
return -1;
}
SDL_PauseAudio(0);
_audioSuspended = false;
return 0;
}
#endif
|
