debuggers.hg

view tools/ioemu/hw/pcspk.c @ 10995:08a11694b109

[qemu] Update ioemu to qemu 0.8.2.

Signed-off-by: Christian Limpach <Christian.Limpach@xensource.com>
author chris@kneesaa.uk.xensource.com
date Mon Aug 07 18:25:30 2006 +0100 (2006-08-07)
parents b450f21472a0
children
line source
1 /*
2 * QEMU PC speaker emulation
3 *
4 * Copyright (c) 2006 Joachim Henke
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
25 #include "vl.h"
27 #define PCSPK_BUF_LEN 1792
28 #define PCSPK_SAMPLE_RATE 32000
29 #define PCSPK_MAX_FREQ (PCSPK_SAMPLE_RATE >> 1)
30 #define PCSPK_MIN_COUNT ((PIT_FREQ + PCSPK_MAX_FREQ - 1) / PCSPK_MAX_FREQ)
32 typedef struct {
33 uint8_t sample_buf[PCSPK_BUF_LEN];
34 QEMUSoundCard card;
35 SWVoiceOut *voice;
36 PITState *pit;
37 unsigned int pit_count;
38 unsigned int samples;
39 unsigned int play_pos;
40 int data_on;
41 int dummy_refresh_clock;
42 } PCSpkState;
44 static const char *s_spk = "pcspk";
45 static PCSpkState pcspk_state;
47 static inline void generate_samples(PCSpkState *s)
48 {
49 unsigned int i;
51 if (s->pit_count) {
52 const uint32_t m = PCSPK_SAMPLE_RATE * s->pit_count;
53 const uint32_t n = ((uint64_t)PIT_FREQ << 32) / m;
55 /* multiple of wavelength for gapless looping */
56 s->samples = (PCSPK_BUF_LEN * PIT_FREQ / m * m / (PIT_FREQ >> 1) + 1) >> 1;
57 for (i = 0; i < s->samples; ++i)
58 s->sample_buf[i] = (64 & (n * i >> 25)) - 32;
59 } else {
60 s->samples = PCSPK_BUF_LEN;
61 for (i = 0; i < PCSPK_BUF_LEN; ++i)
62 s->sample_buf[i] = 128; /* silence */
63 }
64 }
66 static void pcspk_callback(void *opaque, int free)
67 {
68 PCSpkState *s = opaque;
69 unsigned int n;
71 if (pit_get_mode(s->pit, 2) != 3)
72 return;
74 n = pit_get_initial_count(s->pit, 2);
75 /* avoid frequencies that are not reproducible with sample rate */
76 if (n < PCSPK_MIN_COUNT)
77 n = 0;
79 if (s->pit_count != n) {
80 s->pit_count = n;
81 s->play_pos = 0;
82 generate_samples(s);
83 }
85 while (free > 0) {
86 n = audio_MIN(s->samples - s->play_pos, (unsigned int)free);
87 n = AUD_write(s->voice, &s->sample_buf[s->play_pos], n);
88 if (!n)
89 break;
90 s->play_pos = (s->play_pos + n) % s->samples;
91 free -= n;
92 }
93 }
95 int pcspk_audio_init(AudioState *audio)
96 {
97 PCSpkState *s = &pcspk_state;
98 audsettings_t as = {PCSPK_SAMPLE_RATE, 1, AUD_FMT_U8, 0};
100 if (!audio) {
101 AUD_log(s_spk, "No audio state\n");
102 return -1;
103 }
104 AUD_register_card(audio, s_spk, &s->card);
106 s->voice = AUD_open_out(&s->card, s->voice, s_spk, s, pcspk_callback, &as);
107 if (!s->voice) {
108 AUD_log(s_spk, "Could not open voice\n");
109 return -1;
110 }
112 return 0;
113 }
115 static uint32_t pcspk_ioport_read(void *opaque, uint32_t addr)
116 {
117 PCSpkState *s = opaque;
118 int out;
120 s->dummy_refresh_clock ^= (1 << 4);
121 out = pit_get_out(s->pit, 2, qemu_get_clock(vm_clock)) << 5;
123 return pit_get_gate(s->pit, 2) | (s->data_on << 1) | s->dummy_refresh_clock | out;
124 }
126 static void pcspk_ioport_write(void *opaque, uint32_t addr, uint32_t val)
127 {
128 PCSpkState *s = opaque;
129 const int gate = val & 1;
131 s->data_on = (val >> 1) & 1;
132 pit_set_gate(s->pit, 2, gate);
133 if (s->voice) {
134 if (gate) /* restart */
135 s->play_pos = 0;
136 AUD_set_active_out(s->voice, gate & s->data_on);
137 }
138 }
140 void pcspk_init(PITState *pit)
141 {
142 PCSpkState *s = &pcspk_state;
144 s->pit = pit;
145 register_ioport_read(0x61, 1, 1, pcspk_ioport_read, s);
146 register_ioport_write(0x61, 1, 1, pcspk_ioport_write, s);
147 }