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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/*
* QEMU PC speaker emulation
*
* Copyright (c) 2006 Joachim Henke
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "hw/hw.h"
#include "hw/i386/pc.h"
#include "hw/isa/isa.h"
#include "hw/audio/audio.h"
#include "audio/audio.h"
#include "qemu/timer.h"
#include "hw/timer/i8254.h"
#include "hw/audio/pcspk.h"
#define PCSPK_BUF_LEN 1792
#define PCSPK_SAMPLE_RATE 32000
#define PCSPK_MAX_FREQ (PCSPK_SAMPLE_RATE >> 1)
#define PCSPK_MIN_COUNT ((PIT_FREQ + PCSPK_MAX_FREQ - 1) / PCSPK_MAX_FREQ)
#define PC_SPEAKER(obj) OBJECT_CHECK(PCSpkState, (obj), TYPE_PC_SPEAKER)
typedef struct {
ISADevice parent_obj;
MemoryRegion ioport;
uint32_t iobase;
uint8_t sample_buf[PCSPK_BUF_LEN];
QEMUSoundCard card;
SWVoiceOut *voice;
void *pit;
unsigned int pit_count;
unsigned int samples;
unsigned int play_pos;
int data_on;
int dummy_refresh_clock;
} PCSpkState;
static const char *s_spk = "pcspk";
static PCSpkState *pcspk_state;
static inline void generate_samples(PCSpkState *s)
{
unsigned int i;
if (s->pit_count) {
const uint32_t m = PCSPK_SAMPLE_RATE * s->pit_count;
const uint32_t n = ((uint64_t)PIT_FREQ << 32) / m;
/* multiple of wavelength for gapless looping */
s->samples = (PCSPK_BUF_LEN * PIT_FREQ / m * m / (PIT_FREQ >> 1) + 1) >> 1;
for (i = 0; i < s->samples; ++i)
s->sample_buf[i] = (64 & (n * i >> 25)) - 32;
} else {
s->samples = PCSPK_BUF_LEN;
for (i = 0; i < PCSPK_BUF_LEN; ++i)
s->sample_buf[i] = 128; /* silence */
}
}
static void pcspk_callback(void *opaque, int free)
{
PCSpkState *s = opaque;
PITChannelInfo ch;
unsigned int n;
pit_get_channel_info(s->pit, 2, &ch);
if (ch.mode != 3) {
return;
}
n = ch.initial_count;
/* avoid frequencies that are not reproducible with sample rate */
if (n < PCSPK_MIN_COUNT)
n = 0;
if (s->pit_count != n) {
s->pit_count = n;
s->play_pos = 0;
generate_samples(s);
}
while (free > 0) {
n = audio_MIN(s->samples - s->play_pos, (unsigned int)free);
n = AUD_write(s->voice, &s->sample_buf[s->play_pos], n);
if (!n)
break;
s->play_pos = (s->play_pos + n) % s->samples;
free -= n;
}
}
static int pcspk_audio_init(ISABus *bus)
{
PCSpkState *s = pcspk_state;
struct audsettings as = {PCSPK_SAMPLE_RATE, 1, AUD_FMT_U8, 0};
AUD_register_card(s_spk, &s->card);
s->voice = AUD_open_out(&s->card, s->voice, s_spk, s, pcspk_callback, &as);
if (!s->voice) {
AUD_log(s_spk, "Could not open voice\n");
return -1;
}
return 0;
}
static uint64_t pcspk_io_read(void *opaque, hwaddr addr,
unsigned size)
{
PCSpkState *s = opaque;
PITChannelInfo ch;
pit_get_channel_info(s->pit, 2, &ch);
s->dummy_refresh_clock ^= (1 << 4);
return ch.gate | (s->data_on << 1) | s->dummy_refresh_clock |
(ch.out << 5);
}
static void pcspk_io_write(void *opaque, hwaddr addr, uint64_t val,
unsigned size)
{
PCSpkState *s = opaque;
const int gate = val & 1;
s->data_on = (val >> 1) & 1;
pit_set_gate(s->pit, 2, gate);
if (s->voice) {
if (gate) /* restart */
s->play_pos = 0;
AUD_set_active_out(s->voice, gate & s->data_on);
}
}
static const MemoryRegionOps pcspk_io_ops = {
.read = pcspk_io_read,
.write = pcspk_io_write,
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
};
static void pcspk_initfn(Object *obj)
{
PCSpkState *s = PC_SPEAKER(obj);
memory_region_init_io(&s->ioport, &pcspk_io_ops, s, "elcr", 1);
}
static void pcspk_realizefn(DeviceState *dev, Error **errp)
{
ISADevice *isadev = ISA_DEVICE(dev);
PCSpkState *s = PC_SPEAKER(dev);
isa_register_ioport(isadev, &s->ioport, s->iobase);
pcspk_state = s;
}
static Property pcspk_properties[] = {
DEFINE_PROP_HEX32("iobase", PCSpkState, iobase, -1),
DEFINE_PROP_PTR("pit", PCSpkState, pit),
DEFINE_PROP_END_OF_LIST(),
};
static void pcspk_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = pcspk_realizefn;
dc->no_user = 1;
dc->props = pcspk_properties;
}
static const TypeInfo pcspk_info = {
.name = TYPE_PC_SPEAKER,
.parent = TYPE_ISA_DEVICE,
.instance_size = sizeof(PCSpkState),
.instance_init = pcspk_initfn,
.class_init = pcspk_class_initfn,
};
static void pcspk_register(void)
{
type_register_static(&pcspk_info);
isa_register_soundhw("pcspk", "PC speaker", pcspk_audio_init);
}
type_init(pcspk_register)
|
