bellard | fd06c37 | 2006-04-24 21:58:30 +0000 | [diff] [blame] | 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 | */ |
| 24 | |
pbrook | 87ecb68 | 2007-11-17 17:14:51 +0000 | [diff] [blame] | 25 | #include "hw.h" |
| 26 | #include "pc.h" |
| 27 | #include "isa.h" |
| 28 | #include "audio/audio.h" |
| 29 | #include "qemu-timer.h" |
bellard | fd06c37 | 2006-04-24 21:58:30 +0000 | [diff] [blame] | 30 | |
| 31 | #define PCSPK_BUF_LEN 1792 |
| 32 | #define PCSPK_SAMPLE_RATE 32000 |
| 33 | #define PCSPK_MAX_FREQ (PCSPK_SAMPLE_RATE >> 1) |
| 34 | #define PCSPK_MIN_COUNT ((PIT_FREQ + PCSPK_MAX_FREQ - 1) / PCSPK_MAX_FREQ) |
| 35 | |
| 36 | typedef struct { |
| 37 | uint8_t sample_buf[PCSPK_BUF_LEN]; |
| 38 | QEMUSoundCard card; |
| 39 | SWVoiceOut *voice; |
| 40 | PITState *pit; |
| 41 | unsigned int pit_count; |
| 42 | unsigned int samples; |
| 43 | unsigned int play_pos; |
| 44 | int data_on; |
| 45 | int dummy_refresh_clock; |
| 46 | } PCSpkState; |
| 47 | |
| 48 | static const char *s_spk = "pcspk"; |
| 49 | static PCSpkState pcspk_state; |
| 50 | |
| 51 | static inline void generate_samples(PCSpkState *s) |
| 52 | { |
| 53 | unsigned int i; |
| 54 | |
| 55 | if (s->pit_count) { |
| 56 | const uint32_t m = PCSPK_SAMPLE_RATE * s->pit_count; |
| 57 | const uint32_t n = ((uint64_t)PIT_FREQ << 32) / m; |
| 58 | |
| 59 | /* multiple of wavelength for gapless looping */ |
| 60 | s->samples = (PCSPK_BUF_LEN * PIT_FREQ / m * m / (PIT_FREQ >> 1) + 1) >> 1; |
| 61 | for (i = 0; i < s->samples; ++i) |
| 62 | s->sample_buf[i] = (64 & (n * i >> 25)) - 32; |
| 63 | } else { |
| 64 | s->samples = PCSPK_BUF_LEN; |
| 65 | for (i = 0; i < PCSPK_BUF_LEN; ++i) |
| 66 | s->sample_buf[i] = 128; /* silence */ |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | static void pcspk_callback(void *opaque, int free) |
| 71 | { |
| 72 | PCSpkState *s = opaque; |
| 73 | unsigned int n; |
| 74 | |
| 75 | if (pit_get_mode(s->pit, 2) != 3) |
| 76 | return; |
| 77 | |
| 78 | n = pit_get_initial_count(s->pit, 2); |
| 79 | /* avoid frequencies that are not reproducible with sample rate */ |
| 80 | if (n < PCSPK_MIN_COUNT) |
| 81 | n = 0; |
| 82 | |
| 83 | if (s->pit_count != n) { |
| 84 | s->pit_count = n; |
| 85 | s->play_pos = 0; |
| 86 | generate_samples(s); |
| 87 | } |
| 88 | |
| 89 | while (free > 0) { |
| 90 | n = audio_MIN(s->samples - s->play_pos, (unsigned int)free); |
| 91 | n = AUD_write(s->voice, &s->sample_buf[s->play_pos], n); |
| 92 | if (!n) |
| 93 | break; |
| 94 | s->play_pos = (s->play_pos + n) % s->samples; |
| 95 | free -= n; |
| 96 | } |
| 97 | } |
| 98 | |
Paul Brook | 22d83b1 | 2009-05-12 12:33:04 +0100 | [diff] [blame] | 99 | int pcspk_audio_init(qemu_irq *pic) |
bellard | fd06c37 | 2006-04-24 21:58:30 +0000 | [diff] [blame] | 100 | { |
| 101 | PCSpkState *s = &pcspk_state; |
malc | 1ea879e | 2008-12-03 22:48:44 +0000 | [diff] [blame] | 102 | struct audsettings as = {PCSPK_SAMPLE_RATE, 1, AUD_FMT_U8, 0}; |
bellard | fd06c37 | 2006-04-24 21:58:30 +0000 | [diff] [blame] | 103 | |
malc | 1a7dafc | 2009-05-14 03:11:35 +0400 | [diff] [blame] | 104 | AUD_register_card(s_spk, &s->card); |
bellard | fd06c37 | 2006-04-24 21:58:30 +0000 | [diff] [blame] | 105 | |
bellard | d929eba | 2006-07-04 21:47:22 +0000 | [diff] [blame] | 106 | s->voice = AUD_open_out(&s->card, s->voice, s_spk, s, pcspk_callback, &as); |
bellard | fd06c37 | 2006-04-24 21:58:30 +0000 | [diff] [blame] | 107 | if (!s->voice) { |
| 108 | AUD_log(s_spk, "Could not open voice\n"); |
| 109 | return -1; |
| 110 | } |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static uint32_t pcspk_ioport_read(void *opaque, uint32_t addr) |
| 116 | { |
| 117 | PCSpkState *s = opaque; |
| 118 | int out; |
| 119 | |
| 120 | s->dummy_refresh_clock ^= (1 << 4); |
| 121 | out = pit_get_out(s->pit, 2, qemu_get_clock(vm_clock)) << 5; |
| 122 | |
| 123 | return pit_get_gate(s->pit, 2) | (s->data_on << 1) | s->dummy_refresh_clock | out; |
| 124 | } |
| 125 | |
| 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; |
| 130 | |
| 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 | } |
| 139 | |
| 140 | void pcspk_init(PITState *pit) |
| 141 | { |
| 142 | PCSpkState *s = &pcspk_state; |
| 143 | |
| 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 | } |