1/*
2 * QEMU Timer based audio emulation
3 *
4 * Copyright (c) 2004-2005 Vassili Karpov (malc)
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#include "qemu-common.h"
25#include "audio.h"
26#include "qemu-timer.h"
27
28#define AUDIO_CAP "noaudio"
29#include "audio_int.h"
30
31typedef struct NoVoiceOut {
32    HWVoiceOut hw;
33    int64_t old_ticks;
34} NoVoiceOut;
35
36typedef struct NoVoiceIn {
37    HWVoiceIn hw;
38    int64_t old_ticks;
39} NoVoiceIn;
40
41static int no_run_out (HWVoiceOut *hw, int live)
42{
43    NoVoiceOut *no = (NoVoiceOut *) hw;
44    int decr, samples;
45    int64_t now;
46    int64_t ticks;
47    int64_t bytes;
48
49    now = qemu_get_clock (vm_clock);
50    ticks = now - no->old_ticks;
51    bytes = muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());
52    bytes = audio_MIN (bytes, INT_MAX);
53    samples = bytes >> hw->info.shift;
54
55    no->old_ticks = now;
56    decr = audio_MIN (live, samples);
57    hw->rpos = (hw->rpos + decr) % hw->samples;
58    return decr;
59}
60
61static int no_write (SWVoiceOut *sw, void *buf, int len)
62{
63    return audio_pcm_sw_write (sw, buf, len);
64}
65
66static int no_init_out (HWVoiceOut *hw, struct audsettings *as)
67{
68    audio_pcm_init_info (&hw->info, as);
69    hw->samples = 1024;
70    return 0;
71}
72
73static void no_fini_out (HWVoiceOut *hw)
74{
75    (void) hw;
76}
77
78static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
79{
80    (void) hw;
81    (void) cmd;
82    return 0;
83}
84
85static int no_init_in (HWVoiceIn *hw, struct audsettings *as)
86{
87    audio_pcm_init_info (&hw->info, as);
88    hw->samples = 1024;
89    return 0;
90}
91
92static void no_fini_in (HWVoiceIn *hw)
93{
94    (void) hw;
95}
96
97static int no_run_in (HWVoiceIn *hw)
98{
99    NoVoiceIn *no = (NoVoiceIn *) hw;
100    int live = audio_pcm_hw_get_live_in (hw);
101    int dead = hw->samples - live;
102    int samples = 0;
103
104    if (dead) {
105        int64_t now = qemu_get_clock (vm_clock);
106        int64_t ticks = now - no->old_ticks;
107        int64_t bytes =
108            muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());
109
110        no->old_ticks = now;
111        bytes = audio_MIN (bytes, INT_MAX);
112        samples = bytes >> hw->info.shift;
113        samples = audio_MIN (samples, dead);
114    }
115    return samples;
116}
117
118static int no_read (SWVoiceIn *sw, void *buf, int size)
119{
120    int samples = size >> sw->info.shift;
121    int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
122    int to_clear = audio_MIN (samples, total);
123    audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
124    return to_clear;
125}
126
127static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
128{
129    (void) hw;
130    (void) cmd;
131    return 0;
132}
133
134static void *no_audio_init (void)
135{
136    return &no_audio_init;
137}
138
139static void no_audio_fini (void *opaque)
140{
141    (void) opaque;
142}
143
144static struct audio_pcm_ops no_pcm_ops = {
145    .init_out = no_init_out,
146    .fini_out = no_fini_out,
147    .run_out  = no_run_out,
148    .write    = no_write,
149    .ctl_out  = no_ctl_out,
150
151    .init_in  = no_init_in,
152    .fini_in  = no_fini_in,
153    .run_in   = no_run_in,
154    .read     = no_read,
155    .ctl_in   = no_ctl_in
156};
157
158struct audio_driver no_audio_driver = {
159    .name           = "none",
160    .descr          = "Timer based audio emulation",
161    .options        = NULL,
162    .init           = no_audio_init,
163    .fini           = no_audio_fini,
164    .pcm_ops        = &no_pcm_ops,
165    .can_be_default = 1,
166    .max_voices_out = INT_MAX,
167    .max_voices_in  = INT_MAX,
168    .voice_size_out = sizeof (NoVoiceOut),
169    .voice_size_in  = sizeof (NoVoiceIn)
170};
171