2 * QEMU Timer based audio emulation
4 * Copyright (c) 2004-2005 Vassili Karpov (malc)
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
24 #include "qemu-common.h"
26 #include "qemu-timer.h"
28 #define AUDIO_CAP "noaudio"
29 #include "audio_int.h"
31 typedef struct NoVoiceOut {
36 typedef struct NoVoiceIn {
41 static int no_run_out (HWVoiceOut *hw)
43 NoVoiceOut *no = (NoVoiceOut *) hw;
44 int live, decr, samples;
49 live = audio_pcm_hw_get_live_out (&no->hw);
54 now = qemu_get_clock (vm_clock);
55 ticks = now - no->old_ticks;
56 bytes = muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());
57 bytes = audio_MIN (bytes, INT_MAX);
58 samples = bytes >> hw->info.shift;
61 decr = audio_MIN (live, samples);
62 hw->rpos = (hw->rpos + decr) % hw->samples;
66 static int no_write (SWVoiceOut *sw, void *buf, int len)
68 return audio_pcm_sw_write (sw, buf, len);
71 static int no_init_out (HWVoiceOut *hw, struct audsettings *as)
73 audio_pcm_init_info (&hw->info, as);
78 static void no_fini_out (HWVoiceOut *hw)
83 static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
90 static int no_init_in (HWVoiceIn *hw, struct audsettings *as)
92 audio_pcm_init_info (&hw->info, as);
97 static void no_fini_in (HWVoiceIn *hw)
102 static int no_run_in (HWVoiceIn *hw)
104 NoVoiceIn *no = (NoVoiceIn *) hw;
105 int live = audio_pcm_hw_get_live_in (hw);
106 int dead = hw->samples - live;
110 int64_t now = qemu_get_clock (vm_clock);
111 int64_t ticks = now - no->old_ticks;
113 muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());
116 bytes = audio_MIN (bytes, INT_MAX);
117 samples = bytes >> hw->info.shift;
118 samples = audio_MIN (samples, dead);
123 static int no_read (SWVoiceIn *sw, void *buf, int size)
125 int samples = size >> sw->info.shift;
126 int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
127 int to_clear = audio_MIN (samples, total);
128 audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
132 static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
139 static void *no_audio_init (void)
141 return &no_audio_init;
144 static void no_audio_fini (void *opaque)
149 static struct audio_pcm_ops no_pcm_ops = {
150 .init_out = no_init_out,
151 .fini_out = no_fini_out,
152 .run_out = no_run_out,
154 .ctl_out = no_ctl_out,
156 .init_in = no_init_in,
157 .fini_in = no_fini_in,
163 struct audio_driver no_audio_driver = {
165 .descr = "Timer based audio emulation",
167 .init = no_audio_init,
168 .fini = no_audio_fini,
169 .pcm_ops = &no_pcm_ops,
171 .max_voices_out = INT_MAX,
172 .max_voices_in = INT_MAX,
173 .voice_size_out = sizeof (NoVoiceOut),
174 .voice_size_in = sizeof (NoVoiceIn)