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1 | fd06c375 | bellard | /*
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2 | fd06c375 | bellard | * QEMU PC speaker emulation
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3 | fd06c375 | bellard | *
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4 | fd06c375 | bellard | * Copyright (c) 2006 Joachim Henke
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5 | fd06c375 | bellard | *
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6 | fd06c375 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | fd06c375 | bellard | * of this software and associated documentation files (the "Software"), to deal
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8 | fd06c375 | bellard | * in the Software without restriction, including without limitation the rights
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9 | fd06c375 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | fd06c375 | bellard | * copies of the Software, and to permit persons to whom the Software is
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11 | fd06c375 | bellard | * furnished to do so, subject to the following conditions:
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12 | fd06c375 | bellard | *
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13 | fd06c375 | bellard | * The above copyright notice and this permission notice shall be included in
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14 | fd06c375 | bellard | * all copies or substantial portions of the Software.
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15 | fd06c375 | bellard | *
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16 | fd06c375 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | fd06c375 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | fd06c375 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | fd06c375 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | fd06c375 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | fd06c375 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | fd06c375 | bellard | * THE SOFTWARE.
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23 | fd06c375 | bellard | */
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24 | fd06c375 | bellard | |
25 | 87ecb68b | pbrook | #include "hw.h" |
26 | 87ecb68b | pbrook | #include "pc.h" |
27 | 87ecb68b | pbrook | #include "isa.h" |
28 | 87ecb68b | pbrook | #include "audio/audio.h" |
29 | 87ecb68b | pbrook | #include "qemu-timer.h" |
30 | fd06c375 | bellard | |
31 | fd06c375 | bellard | #define PCSPK_BUF_LEN 1792 |
32 | fd06c375 | bellard | #define PCSPK_SAMPLE_RATE 32000 |
33 | fd06c375 | bellard | #define PCSPK_MAX_FREQ (PCSPK_SAMPLE_RATE >> 1) |
34 | fd06c375 | bellard | #define PCSPK_MIN_COUNT ((PIT_FREQ + PCSPK_MAX_FREQ - 1) / PCSPK_MAX_FREQ) |
35 | fd06c375 | bellard | |
36 | fd06c375 | bellard | typedef struct { |
37 | fd06c375 | bellard | uint8_t sample_buf[PCSPK_BUF_LEN]; |
38 | fd06c375 | bellard | QEMUSoundCard card; |
39 | fd06c375 | bellard | SWVoiceOut *voice; |
40 | fd06c375 | bellard | PITState *pit; |
41 | fd06c375 | bellard | unsigned int pit_count; |
42 | fd06c375 | bellard | unsigned int samples; |
43 | fd06c375 | bellard | unsigned int play_pos; |
44 | fd06c375 | bellard | int data_on;
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45 | fd06c375 | bellard | int dummy_refresh_clock;
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46 | fd06c375 | bellard | } PCSpkState; |
47 | fd06c375 | bellard | |
48 | fd06c375 | bellard | static const char *s_spk = "pcspk"; |
49 | fd06c375 | bellard | static PCSpkState pcspk_state;
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50 | fd06c375 | bellard | |
51 | fd06c375 | bellard | static inline void generate_samples(PCSpkState *s) |
52 | fd06c375 | bellard | { |
53 | fd06c375 | bellard | unsigned int i; |
54 | fd06c375 | bellard | |
55 | fd06c375 | bellard | if (s->pit_count) {
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56 | fd06c375 | bellard | const uint32_t m = PCSPK_SAMPLE_RATE * s->pit_count;
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57 | fd06c375 | bellard | const uint32_t n = ((uint64_t)PIT_FREQ << 32) / m; |
58 | fd06c375 | bellard | |
59 | fd06c375 | bellard | /* multiple of wavelength for gapless looping */
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60 | fd06c375 | bellard | s->samples = (PCSPK_BUF_LEN * PIT_FREQ / m * m / (PIT_FREQ >> 1) + 1) >> 1; |
61 | fd06c375 | bellard | for (i = 0; i < s->samples; ++i) |
62 | fd06c375 | bellard | s->sample_buf[i] = (64 & (n * i >> 25)) - 32; |
63 | fd06c375 | bellard | } else {
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64 | fd06c375 | bellard | s->samples = PCSPK_BUF_LEN; |
65 | fd06c375 | bellard | for (i = 0; i < PCSPK_BUF_LEN; ++i) |
66 | fd06c375 | bellard | s->sample_buf[i] = 128; /* silence */ |
67 | fd06c375 | bellard | } |
68 | fd06c375 | bellard | } |
69 | fd06c375 | bellard | |
70 | fd06c375 | bellard | static void pcspk_callback(void *opaque, int free) |
71 | fd06c375 | bellard | { |
72 | fd06c375 | bellard | PCSpkState *s = opaque; |
73 | fd06c375 | bellard | unsigned int n; |
74 | fd06c375 | bellard | |
75 | fd06c375 | bellard | if (pit_get_mode(s->pit, 2) != 3) |
76 | fd06c375 | bellard | return;
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77 | fd06c375 | bellard | |
78 | fd06c375 | bellard | n = pit_get_initial_count(s->pit, 2);
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79 | fd06c375 | bellard | /* avoid frequencies that are not reproducible with sample rate */
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80 | fd06c375 | bellard | if (n < PCSPK_MIN_COUNT)
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81 | fd06c375 | bellard | n = 0;
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82 | fd06c375 | bellard | |
83 | fd06c375 | bellard | if (s->pit_count != n) {
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84 | fd06c375 | bellard | s->pit_count = n; |
85 | fd06c375 | bellard | s->play_pos = 0;
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86 | fd06c375 | bellard | generate_samples(s); |
87 | fd06c375 | bellard | } |
88 | fd06c375 | bellard | |
89 | fd06c375 | bellard | while (free > 0) { |
90 | fd06c375 | bellard | n = audio_MIN(s->samples - s->play_pos, (unsigned int)free); |
91 | fd06c375 | bellard | n = AUD_write(s->voice, &s->sample_buf[s->play_pos], n); |
92 | fd06c375 | bellard | if (!n)
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93 | fd06c375 | bellard | break;
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94 | fd06c375 | bellard | s->play_pos = (s->play_pos + n) % s->samples; |
95 | fd06c375 | bellard | free -= n; |
96 | fd06c375 | bellard | } |
97 | fd06c375 | bellard | } |
98 | fd06c375 | bellard | |
99 | 22d83b14 | Paul Brook | int pcspk_audio_init(qemu_irq *pic)
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100 | fd06c375 | bellard | { |
101 | fd06c375 | bellard | PCSpkState *s = &pcspk_state; |
102 | 1ea879e5 | malc | struct audsettings as = {PCSPK_SAMPLE_RATE, 1, AUD_FMT_U8, 0}; |
103 | fd06c375 | bellard | |
104 | 1a7dafce | malc | AUD_register_card(s_spk, &s->card); |
105 | fd06c375 | bellard | |
106 | d929eba5 | bellard | s->voice = AUD_open_out(&s->card, s->voice, s_spk, s, pcspk_callback, &as); |
107 | fd06c375 | bellard | if (!s->voice) {
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108 | fd06c375 | bellard | AUD_log(s_spk, "Could not open voice\n");
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109 | fd06c375 | bellard | return -1; |
110 | fd06c375 | bellard | } |
111 | fd06c375 | bellard | |
112 | fd06c375 | bellard | return 0; |
113 | fd06c375 | bellard | } |
114 | fd06c375 | bellard | |
115 | fd06c375 | bellard | static uint32_t pcspk_ioport_read(void *opaque, uint32_t addr) |
116 | fd06c375 | bellard | { |
117 | fd06c375 | bellard | PCSpkState *s = opaque; |
118 | fd06c375 | bellard | int out;
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119 | fd06c375 | bellard | |
120 | fd06c375 | bellard | s->dummy_refresh_clock ^= (1 << 4); |
121 | fd06c375 | bellard | out = pit_get_out(s->pit, 2, qemu_get_clock(vm_clock)) << 5; |
122 | fd06c375 | bellard | |
123 | fd06c375 | bellard | return pit_get_gate(s->pit, 2) | (s->data_on << 1) | s->dummy_refresh_clock | out; |
124 | fd06c375 | bellard | } |
125 | fd06c375 | bellard | |
126 | fd06c375 | bellard | static void pcspk_ioport_write(void *opaque, uint32_t addr, uint32_t val) |
127 | fd06c375 | bellard | { |
128 | fd06c375 | bellard | PCSpkState *s = opaque; |
129 | fd06c375 | bellard | const int gate = val & 1; |
130 | fd06c375 | bellard | |
131 | fd06c375 | bellard | s->data_on = (val >> 1) & 1; |
132 | fd06c375 | bellard | pit_set_gate(s->pit, 2, gate);
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133 | fd06c375 | bellard | if (s->voice) {
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134 | fd06c375 | bellard | if (gate) /* restart */ |
135 | fd06c375 | bellard | s->play_pos = 0;
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136 | fd06c375 | bellard | AUD_set_active_out(s->voice, gate & s->data_on); |
137 | fd06c375 | bellard | } |
138 | fd06c375 | bellard | } |
139 | fd06c375 | bellard | |
140 | fd06c375 | bellard | void pcspk_init(PITState *pit)
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141 | fd06c375 | bellard | { |
142 | fd06c375 | bellard | PCSpkState *s = &pcspk_state; |
143 | fd06c375 | bellard | |
144 | fd06c375 | bellard | s->pit = pit; |
145 | fd06c375 | bellard | register_ioport_read(0x61, 1, 1, pcspk_ioport_read, s); |
146 | fd06c375 | bellard | register_ioport_write(0x61, 1, 1, pcspk_ioport_write, s); |
147 | fd06c375 | bellard | } |